WO2012124811A1 - Electric braking device with parking mechanism - Google Patents

Abstract

A locking device for parking comprises: a rotation-side engagement member (27) which is fixed to part of a rotary shaft (35) that rotates in accordance with the passage of current to an electric motor (8a); a restriction-side engagement member (28) which can displace in the direction of advancement to and separation from the rotation-side engagement member (27), and is supported in a state in which rotation about the rotary shaft (35) is restricted; and an elastic member (29) which is provided in a section of the restriction-side engagement member (28).

Description

Electric brake device with parking mechanism

The present invention relates to an improvement of an electric brake device with a parking mechanism that generates a braking force using an electric motor as a drive source and that can maintain the braking force even after energization of the electric motor is stopped.

Electric disc brakes that use an electric motor as a drive source eliminate the need for hydraulic piping compared to hydraulic disc brakes that have been widely used in the past, which not only facilitates manufacturing and reduces costs, Research is being conducted because it has many advantages, such as the fact that used brake fluid is not generated and the environmental load is small, and that there is no movement of the brake fluid, so that responsiveness can be improved. As such an electric disc brake, the output of the electric motor is input to a force-increasing mechanism, and this force-increasing mechanism converts the rotary motion of this electric motor into a linear motion while increasing the force, and a pair of pads is placed on both sides of the rotor. Various types of structures that strongly press have been proposed. Further, as described in Patent Documents 1 to 3, an electric brake device with a parking mechanism that can maintain a braking force even after energization of the electric motor is stopped has been known. . In each of the inventions described in these patent documents, a pair of pads, each of which is a braking friction member, is pressed against both axial sides of a brake rotor, which is a braking rotor that rotates together with the wheels. Is targeted.

For this reason, any of the electric brake devices with a parking mechanism described in each of the above-mentioned patent documents converts the rotary motion of the output shaft of the electric motor into a linear motion and presses both pads against the brake rotor. And a parking lock device for maintaining the two pads pressed against the brake rotor even after the energization of the electric motor is stopped. Of these, the parking lock device is required to have a function of continuously pressing both pads against the brake rotor even after the electric power supply to the electric motor is stopped.

11 and 12 show the structure of an electric disc brake device with a parking mechanism provided with a parking locking device described in Patent Document 4. FIG.
The electric disc brake device 1 with a parking mechanism electrically functions both the service brake device and the parking brake device.
This electric disc brake device 1 with a parking mechanism includes a caliper 2, a support 3 that is a support member, a piston 4, a brake rotor 5 that is a rotating rotating body that rotates together with wheels, and an axial direction of the brake rotor 5. Inner and outer pads 6a and 6b which are a pair of brake pads (braking friction members) provided in a state of being sandwiched from both sides, a ball ramp mechanism 7 which is an electric pressing device, an electric motor 8, a speed reduction mechanism 9, And a locking mechanism 12. Of these, the lock mechanism 12 includes a solenoid 13 (see FIG. 12), an engaging claw member 14, and a claw wheel 15. The claw wheel 15 includes an inner member 16 and an outer member 17 provided concentrically with each other, and an elastic member 18 provided between the peripheral surfaces of the inner member 16 and the outer member 17. . The inner member 16 is externally fitted and fixed to the rear end portion of the motor rotor 10 of the electric motor 8.

In such an electric disc brake device 1 with a parking mechanism, when the service brake device is operated, a predetermined current is supplied to the electric motor 8 based on the brake operation of the driver, and the electric motor 8 The motor rotor 10 is rotated in the braking direction. The rotation of the motor rotor 10 is decelerated at a predetermined reduction ratio by the reduction mechanism 9 and the torque is increased, and then converted into a linear motion by the ball ramp mechanism 7 to move the piston 4 to the brake rotor 5 side. Displace. Then, the inner pad 6 a on the inner side of the pair of inner and outer pads 6 a and 6 b is pressed against the inner side surface of the brake rotor 5. Then, as a reaction of this pressing force, the caliper claw 11 of the caliper 2 presses the outer pad 6 b on the outer side against the outer side surface of the brake rotor 5.
When releasing the brake, the motor rotor 10 is rotated in the reverse direction to displace the piston 4 in a direction away from the brake rotor 5, and the inner and outer pads 6 a and 6 b are separated from the brake rotor 5.

When the parking brake device of the electric disc brake device 1 with the parking mechanism is operated, the inner and outer pads 6a, 6b are rotated by rotating the motor rotor 10 in the braking direction based on the operation of the driver's switch. Is pressed against the brake rotor 5. In this state, a claw portion 20 formed on the outer peripheral surface of the claw wheel 15 so that the engagement claw portion 19 of the claw wheel 15 is formed by operating the solenoid 13 constituting the lock mechanism 12. Engage. In this way, by restricting the rotation of the motor rotor 10 of the electric motor 8, the braking state is maintained in a state where energization of the electric motor 8 and the solenoid 13 is stopped.

In the case of the parking brake device that operates in this way, when the claw portion 20 of the claw wheel 15 and the engagement claw portion 19 of the engagement claw member 14 are engaged, it is generated due to the inertia of the motor rotor 10 or the like. The impact to be absorbed can be absorbed by the elastic member 18 provided between the inner member 16 and the outer member 17 of the claw wheel 15. However, when the elastic member 18 is damaged or deteriorated, the inner member 16 and the outer member 17 may be loosely engaged with each other, and the axial force for maintaining the braking state may be reduced. Conceivable. Further, since the claw portion 20 of the claw wheel 15 and the engagement claw portion 19 of the engagement claw member 14 are directly engaged, it is conceivable that a collision sound is generated during the engagement.

Patent Document 2 also absorbs the residual rotational energy of the electric motor by providing an elastic member between a flange portion formed on the rotating shaft of the electric motor and a claw wheel engaged with the flange portion. The structure to be described is described. However, even in this structure, the same problem as in Patent Document 1 can be considered.

Japanese Unexamined Patent Publication No. 2003-307240 Japanese Unexamined Patent Publication No. 2008-275053 Japanese National Table 2001-524647 Japanese Unexamined Patent Publication No. 2007-321862 Japanese Unexamined Patent Publication No. 2003-104179 Japanese Unexamined Patent Publication No. 2004-169729

In view of the circumstances as described above, the present invention absorbs an impact when the output shaft of an electric motor is locked, thereby improving durability and preventing a collision sound at the time of impact. An object of the present invention is to provide an attached electric brake device.

The above object of the present invention is achieved by an electric brake device with a parking mechanism having the following configuration.
(1) The electric brake device with a parking mechanism includes a braking rotator, a support member, a braking friction member, an electric pressing device, and a parking lock device.
The brake rotator rotates with the wheel, and corresponds to a brake rotor constituting a disc brake device or a drum constituting a drum brake device.
The support member is supported by a non-rotating portion in a state adjacent to the braking rotator, and supports (in the case of a floating caliper type disc brake) or a caliper (opposing piston) constituting a disc brake device. Type disc brake device) or a back plate constituting a drum brake device.
Further, the braking friction member is configured such that a part of the support member is opposed to a part of the braking rotating body (both axial side surfaces of the brake rotor and an inner peripheral surface of the drum). It is supported so that it can move with respect to the body.
The electric pressing device uses an electric motor as a drive source and moves the braking friction member in a direction approaching the braking rotating body via a speed reduction mechanism.
The parking lock device keeps the braking friction member pressed against the braking rotator even after the energization of the electric motor is stopped.

Furthermore, the parking lock device in the electric brake device with a parking mechanism includes a rotation side engagement member, a suppression side engagement member, an electric actuator, and a buffer mechanism.
The rotation-side engagement member is fixed to a part of a rotation shaft that rotates when the electric motor is energized, and has a rotation-side engagement surface concentric with the rotation shaft. Further, the rotating side engaging member has a predetermined direction based on a reaction of the braking force in a state where the braking friction member is pressed against the braking rotating body by the electric pressing device to generate a braking force. Torque to rotate is applied.
In addition, the restraining side engaging member can be displaced in the direction of moving to and away from the rotating side engaging surface directly or via another member with respect to the support member, and can rotate around the rotation axis. Is supported in a state in which the rotation side engagement surface is engaged with and disengaged from the rotation side engagement surface.
Further, the electric actuator is for applying a force in the direction of moving toward and away from the rotating side engaging member to the deterring side engaging member based on energization, for example, a direct acting solenoid Etc. can be used.
Further, the buffer mechanism may include at least one engagement member of the inhibition side engagement member and the rotation side engagement member or a part of a displacement member that is displaced in synchronization with the one engagement member. The engagement member or the displacement member is provided between the opposing member and the engagement member or the displacement member before the engagement member and the rotation-side engagement member are engaged with each other. By acting to slow the relative displacement speed with the mating member, the impact during this engagement is mitigated.

(2) An electric brake device with a parking mechanism as in the configuration of (1) above, wherein the rotating shaft to which the rotating side engaging member is fixed is an output shaft of the electric motor. Brake device.
Further, as a specific structure for implementing the electric brake device with a parking mechanism as in the configuration (1) or (2), for example, the following configurations (3) to (6) can be adopted. .

(3) The structure according to (1) or (2) above, wherein the restraining side engaging member is concentrically displaceable in the axial direction with respect to the rotating side engaging member and is not rotatable. Provided.
The buffer mechanism is constituted by an elastic member provided in a part of at least one of the restraining side engaging member and the rotating side engaging member and a part facing the counterpart member. Is done.
And before the said suppression side engaging member and the said rotation side engaging member engage, the said elastic member contact | abuts a part of said other member.

(4) The structure according to the above (1) or (2), wherein the restraining side engaging member is axially displaceable and non-rotatable with respect to the rotating side engaging member, It is provided concentrically with the rotating side engaging member.
Further, the buffer mechanism is composed of a concave portion provided in one of the restraining side engaging member or the rotating side engaging member, and a convex portion provided in the other engaging member. An air damper mechanism is used.
And before the said suppression side engagement member and the said rotation side engagement member engage, the said convex part and the said recessed part engage, and air is confine | sealed in the said recessed part.

(5) The structure according to (1) or (2) above, wherein the rotation-side engagement member has a helical gear-like uneven portion formed on the entire outer peripheral surface.
The restraining side engaging member includes an engaging convex portion that engages with a concave portion of the concave and convex portions of the rotating side engaging member, and exists in a direction orthogonal to the central axis of the rotating side engaging member. Provided on a virtual plane.
Moreover, the said buffer mechanism is comprised with the elastic member provided in at least one of the front-end | tip part of the said engagement convex part of the said suppression side engagement member, and the bottom part of the recessed part of the said uneven part.
Then, before the engagement convex portion of the restraining side engaging member and the concave portion of the concave and convex portion of the rotation side engaging member engage with each other, the elastic member is inserted into the concave portion and the distal end portion of the engaging convex portion. Is sandwiched between.

(6) The structure according to (1) or (2), wherein the electric actuator is a solenoid that linearly moves the plunger based on energization.
The solenoid includes a coil, a case, and a plunger.
The plunger is supported by the case so as to be axially displaceable and non-rotatable. Also, one end and the other end of the plunger are projected outside the case from a pair of through holes provided concentrically with each other at both ends of the case. An intermediate portion of the plunger is disposed inside the case, and a part of the intermediate portion is a large diameter portion having an outer diameter larger than the inner diameter of the through hole.
Further, the restraining side engaging member is provided at one end of the plunger so as not to rotate and to be displaced in the axial direction together with the plunger.
An elastic member constituting the buffer mechanism is provided at the other end of the plunger.
And before the said suppression side engaging member and the said rotation side engaging member engage, the said elastic member contact | abuts to the edge part outer surface of the said case which is a receiving surface.

(7) In the electric brake device with a parking mechanism as in the above configurations (1) to (6), the electric actuator is a solenoid that linearly moves the plunger based on energization.
The solenoid includes a coil, a case, and a plunger.
The plunger is supported by the case so as to be axially displaceable and non-rotatable. Also, one end and the other end of the plunger are projected outside the case from a pair of through holes provided concentrically with each other at both ends of the case. And the intermediate part of the said plunger is arrange | positioned inside the said case, and a part of said intermediate part is made into the large diameter part which has an outer diameter larger than the internal diameter of the said through-hole.
Further, the restraining side engaging member is provided at one end of the plunger so as not to rotate and to be displaced in the axial direction together with the plunger.
An elastic member is provided at the other end of the plunger.
And before the other end edge of the said large diameter part contacts the inner surface of the said case, the said elastic member contacts the 2nd receiving surface which exists in the part facing the said case.

In the case of the parking lock device having the configuration as described in (1) above, the inhibition side engagement member and the rotation side engagement member are engaged between the inhibition side engagement member and the rotation side engagement member. Before the engagement, a buffer mechanism is provided to reduce the impact during the engagement. For this reason, the impact at the time of this engagement is relieved, durability of the said restraining side engaging member and the said rotation side engaging member can be aimed at, and generation | occurrence | production of an impact sound can be prevented.
Further, even when the elastic member is deteriorated, the deterioration of the elastic member does not affect the engagement between the restraining side engaging member and the rotating side engaging member with respect to the rotating direction. There is no play.

Further, if the restraining side engaging member and the rotating side engaging member are arranged concentrically as in the configurations of (3), (4) and (6) above, the radial direction of the rotating side engaging member will be described. Can be miniaturized.
Further, as in the configuration of (5) above, if the restraining side engaging member is disposed on a virtual plane that exists in a direction perpendicular to the central axis of the rotating side engaging member, the rotating side engaging member The size can be reduced with respect to the axial direction of the member.
As described above, according to the conditions such as the design of the electric brake with a parking mechanism as a whole, the structure of (3), (4), (6) or the structure of (5) is appropriately selected. By selecting, the degree of freedom of design can be improved.

Further, as in the configuration of (7) above, if an elastic member is provided at the other end of the plunger that constitutes the solenoid that is the electric actuator, the rotation-side engagement member of the restraining-side engagement member When the plunger is displaced in a direction to release the locked state, the elastic member faces the case before the large diameter portion formed in the intermediate portion of the plunger contacts the inner surface of the solenoid case. Abutting on a second receiving surface present in the portion, the plunger reduces the impact when contacting the inner surface of the case of the solenoid. For this reason, durability of these plungers and solenoids can be improved, and the generation of impact sound at the time of contact can be suppressed.

FIG. 1 is a schematic diagram showing a first example of an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a specific structure of the first example of the embodiment of the present invention. The lower left portion represents the AA cross section of FIG. 3, and the upper right portion represents the BB cross section of FIG. 3 is a cross-sectional view taken along the line CC of FIG. 4 (A) and 4 (B) are enlarged views of the portion X in FIG. 2, FIG. 4 (A) shows a state when the parking lock mechanism is not in operation, and FIG. 4 (B) shows the parking lock mechanism. The state at the time of operation is shown. 5 (A) to 5 (C) are enlarged views of the Y part in FIG. 2, and FIG. 5 (A) shows a state before the second elastic member comes into contact with the second receiving surface. (B) shows a state in which the second elastic member is in contact with the second receiving surface, and FIG. 5 (C) shows a state in which the second elastic member is elastically deformed and absorbs the impact after this contact. ing. FIG. 6A is a cross-sectional view showing a state in which a unit combining the force-increasing mechanism and the axial force sensor is taken out and assembled to the caliper, and FIG. 6B is a cross-sectional view showing the state before the assembly. 7A and 7B are cross-sectional views showing a second example of the embodiment of the present invention. FIG. 7A shows a state where the air damper mechanism is not in operation, and FIG. ) Shows the state when the air damper mechanism is in operation. FIG. 8 is a schematic diagram showing a third example of the embodiment of the present invention. 9 is a cross-sectional view taken along the line DD of FIG. 10 (A) to 10 (C) are cross-sectional views showing a fourth example of the embodiment of the present invention. FIG. 10 (A) shows a state before the elastic member comes into contact with the receiving surface. 10 (B) shows a state in which the elastic member is in contact with the receiving surface, and FIG. 10 (C) shows a state in which the elastic member is elastically deformed and absorbs an impact after the contact. FIG. 11 is a sectional view of an electric disc brake device with a parking mechanism, showing an example of a conventional structure. 12 is a cross-sectional view taken along the line EE of FIG.

[First example of embodiment]
FIGS. 1 to 6B show a first example of an embodiment of the present invention corresponding to the above-described configurations (1) to (3) and (7). The structure of the first example of the present embodiment is shown when the present invention is applied to a floating type disc brake.
The electric disc brake device with a parking mechanism (electric brake device with a parking mechanism) 101 includes a brake rotor 5 that is a brake rotating body, a support that is a support member (not shown), and a brake friction member. An inner pad 6a and an outer pad 6b, an electric pressing device 21, and a parking lock device 22 are provided.
Among these, the brake rotor 5 is fixed concentrically with a wheel (not shown) and rotates together with the wheel.
The support is provided adjacent to the brake rotor 5 so as to straddle a part of the brake rotor 5 in the circumferential direction, and is supported and fixed to a non-rotating portion such as a knuckle constituting the suspension device. Since the structure and function of the support constituting such a floating type disc brake are well known in the conventional hydraulic disc brakes, illustration and detailed description thereof are omitted.

Further, the inner pad 6a and the outer pad 6b are opposed to the both sides in the axial direction of the brake rotor 5 at a part of the support that sandwiches a part of the circumferential direction of the brake rotor 5 from both sides in the axial direction. Thus, the brake rotor 5 is supported so as to be able to move in the near and far directions. That is, the inner pad 6 a and the outer pad 6 b are supported so as to be able to be displaced along the axial direction of the brake rotor 5.

The electric pressing device 21 includes an electric motor 8a as a drive source, a speed reduction mechanism 9a such as a gear type reduction gear that has reversibility in the power transmission direction, a feed screw mechanism 23, and a ball ramp mechanism 24. And a thrust generation mechanism 25 that converts rotational motion into linear motion. Such an electric pressing device 21 can be configured to be installed in the caliper 2a as shown in FIG. 1 or to be stored in a casing 26 fixed to the caliper 2a as shown in FIG. .
The caliper 2a is supported with respect to the support so as to be capable of displacement along the axial direction of the brake rotor 5. In the case of the first example of the present embodiment, the thrust generating mechanism 25 presses the inner pad 6 a against the inner side surface of the brake rotor 5. The thrust generating mechanism 25 is also reversible with respect to the direction of force transmission. Then, as a reaction of pressing by the thrust generating mechanism 25, the caliper 2a is displaced to the inner side with respect to the support, and a caliper claw 11a provided at an outer side end portion of the caliper 2a connects the outer pad 6b to the brake rotor. Press against the outer side of 5. In this state, the brake rotor 5 is strongly clamped by the outer pad 6b and the inner pad 6a from both sides in the axial direction, and braking is performed.
In the case of the first example of the present embodiment, the thrust generating mechanism 25 is configured by a combination of a feed screw mechanism 23 and a ball ramp mechanism 24. The structure and operation of such a thrust generating mechanism 25 are basically the same as the conventional structure described in Patent Document 6. However, when the present invention is carried out, the thrust generating mechanism 25 is not limited to the structure in which the feed screw mechanism 23 and the ball ramp mechanism 24 are combined as shown in the figure, but a shaft such as a cam roller mechanism that increases the rotational force. Various mechanical boosting mechanisms that convert to force can be used.

Further, the parking lock device 22 is provided to keep the inner and outer pads 6a and 6b pressed against both side surfaces in the axial direction of the brake rotor 5 even after the energization of the electric motor 8a is stopped. ing. The parking lock device 22 having such a role includes a solenoid 13a that is an electric actuator, a rotation side engagement member 27, a suppression side engagement member 28, and a first elastic member (buffer mechanism) 29. And a second elastic member (buffer mechanism) 30.

Among these, the solenoid 13a includes a coil (not shown), a case 31 (see FIG. 5A), and a plunger 32. The plunger 32 has an intermediate portion disposed inside the case 31. The plunger 32 is displaceable in the axial direction with one end and the other end protruding from the case 31 through a pair of through holes 33 and 33 provided concentrically at both ends of the case 31. And it is supported so that it cannot rotate. For this purpose, for example, a part of the plunger 32 and a part of the case 31 are spline-engaged or key-engaged. An intermediate portion of the plunger 32 is a large-diameter portion 34 that can be displaced in the axial direction together with the plunger 32 and has an outer diameter larger than the inner diameters of the through holes 33 and 33.
The restraining side engaging member 28 is fixed to one end of the plunger 32 of the solenoid 13a (the right end of FIGS. 1, 2, 4 (A) to 5 (C)). The second elastic member 30 is attached to the other end of the plunger 32 (the left end of FIGS. 1, 2, 4 (A) to 5 (C)).

Further, the rotation side engaging member 27 protrudes on the opposite side of the output shaft 35 of the electric motor 8a to the speed reduction mechanism 9a (left side of FIGS. 1, 2, 4 (A), 4 (B)). It is fixed to the tip of the part so as to rotate together with the output shaft 35.
Such a rotation-side engagement member 27 has a bevel gear shape, and the front end surface of the rotation-side engagement member 27 (the surface opposite to the main body portion of the electric motor 8a is shown in FIGS. ) A portion closer to the outer diameter of the left side surface of 4 (B) is a rotation side engaging portion 36 concentric with the output shaft 35. Further, on the outer peripheral surface of the rotation side engaging portion 36, a rotation side uneven portion 37 having a gear shape is formed on the entire periphery.

In addition, at the distal end portion of the restraining side engaging member 28, a restraining side engaging recess 38 for engaging with the rotating side engaging portion 36 of the rotating side engaging member 27 is formed. Further, on the inner peripheral surface of the restraining side engaging recess 38, a restraining side uneven portion 39 that can be engaged with the rotating side uneven portion 37 formed on the outer peripheral surface of the rotating side engaging member 27 is formed. The material of such a restraining side engaging member 28 is not particularly limited as long as sufficient strength and rigidity can be ensured, such as metal and synthetic resin. Such a restraining side engaging member 28 is moved in the direction of moving relative to the rotating side engaging member 27 by the solenoid 13a in a state in which the rotation is prevented, that is, the shaft of the output shaft 35 of the electric motor 8a. It is supported to allow displacement along the direction.

Further, the first elastic member 29 has a locking recess 40 formed at the center of the bottom surface of the restraining side engaging recess 38 of the restraining side engaging member 28, and a tip portion from the bottom surface to the rotating side engaging member. It is mounted in a state protruding in the direction of the member 27. Such a first elastic member 29 can be a spring or an elastomer such as rubber.

Further, the second elastic member 30 is integrally formed of an elastomer such as rubber and has an H shape including a pair of side plates 41 and 41 and a connecting plate 42. Among these, the pair of side plates 41, 41 are arranged in parallel with the central axis of the plunger 32 with the other end portion of the plunger 32 sandwiched therebetween. The connecting plate 42 is provided on a virtual plane that exists in a direction orthogonal to the central axis of the plunger 32 and connects the side plates 41 and 41 to each other. Further, a through hole (not shown) for fixing the connecting plate 42 to the outer peripheral surface of the other end of the plunger 32 is formed in the central portion of the connecting plate 42. The connecting plate 42 is fixed to the plunger 32 by, for example, forming a locking groove over the entire outer peripheral surface of the other end portion of the plunger 32 and connecting the inner peripheral surface of the through hole to the engaging surface. The outer fitting is fixed to the stop groove. In addition, it can also be fixed by bonding or the like.

In addition, the second elastic member 30 has the other end edge of the second elastic member 30 (the other end edge of the pair of side plates 41 and 41) and the second receiving member in the configuration of the above (7). A distance L ₄₃ (see FIG. 5A) between the caliper 2a facing the other end edge or the inner surface of the casing 26 (see FIG. 2) or the like is a surface _{43 of the} large-diameter portion 34. The distance L ₃₁ is smaller than the distance L ₃₁ between the other end surface (the left end surface in FIG. 5A) and the surface of the inner surface of the case 31 facing the other end surface of the large diameter portion 34 (L ₄₃ <L _31). ).
The solenoid 13a employs a 2-way solenoid that can change the operating direction based on a signal from a control device (not shown).

In the case of the electric disc brake device 101 with the parking mechanism of the first example, as described above, as shown in FIG. 1, the electric motor 8a, the speed reduction mechanism 9a, and the parking lock device 22 are connected to the caliper. As shown in FIG. 2, the electric motor 8a, the speed reduction mechanism 9a, and the parking lock device 22 are housed in a casing 26 fixed in the caliper 2a. It can be a structure. A specific structure, operation, and effect of an electric disc brake device with a parking mechanism to which the present invention is applied will be described below with reference to FIG.

In the case of the electric disc brake device 101 with a parking mechanism shown in FIG. 2, a reduction small gear 44 is concentric with the output shaft 35 at the tip end portion (the right end portion in FIG. 2) of the output shaft 35 of the electric motor 8 a. The outer fitting is fixed (spline engagement). Further, the speed reduction mechanism 9a is shown in FIG. 3 between the speed reduction small gear 44 and the speed reduction large gear 46 fitted and fixed to the base end portion of the drive spindle 45 provided at the center of the thrust generating mechanism 25. By arranging a plurality of gears as shown, the rotation of the output shaft 35 is increased (torque is increased) and transmitted to the drive spindle 45, so that the drive spindle 45 is rotationally driven with a large torque. I have to.

In order to constitute the thrust generating mechanism 25, a flange 47 having an outward flange shape is formed at an axially intermediate portion of the drive spindle 45, and an inner side surface of the flange 47 is supported by a thrust rolling bearing 48. . With this configuration, the drive spindle 45 can be driven to rotate while supporting a thrust load directed toward the inner side. In the case of the first example of the present embodiment, the flange portion 47 and the thrust rolling bearing 48 are elastic with respect to the axial direction, such as an axial force sensor 49, a wave plate spring, a compression coil spring, and rubber. Along with the deformable elastic member 50, it is housed in the case unit 51. The case unit 51 is formed by combining an inner side case 52 and an outer side case 53. The case unit 51 is formed by combining the inner and outer cases 52 and 53 in a non-separable manner so that they can be slightly displaced in the axial direction.

Among these, the inner side case 52 is provided with a cylindrical fixed side peripheral wall portion 56 from the outer peripheral edge of the annular bottom plate portion 55 having a circular through hole 54 at the center portion toward the outer side. An extraction hole 58 for exposing an end portion of the connector 57 for extracting the measurement signal of the axial force sensor 49 is provided at one position in the circumferential direction of the proximal side wall portion (inner side portion) of the fixed side peripheral wall portion 56. Is formed. In addition, a plurality of locking holes 59 that are long in the axial direction are provided at a plurality of circumferential positions (for example, two or three positions at equal intervals in the circumferential direction) of the fixed-side peripheral wall portion 56 at the front half portion (outer portion). , 59 are formed. The structure for exposing the end portion of the connector 57 may be a notch that opens at the front end edge (outer side end edge) of the fixed-side peripheral wall portion 56 instead of the take-out hole 58. However, in this case, the phase in the circumferential direction between this notch and each of the locking holes 59, 59 is shifted (a notch is provided between the locking holes 59, 59 adjacent in the circumferential direction). ).

On the other hand, the outer case 53 is provided with a cylindrical displacement side peripheral wall 62 from the outer peripheral edge of the annular bottom plate 61 having a circular through hole 60 in the center toward the inner side. Then, the engagement pieces 63, 63 formed at a plurality of positions in the circumferential direction on the distal end edge (inner side edge) of the displacement side peripheral wall portion 62 cause the engagement holes 59, 59 to move in the axial direction. The case unit 51 is configured to be engaged with each other. The axial dimension of the case unit 51 can be expanded and contracted within a range in which the engagement pieces 63 and 63 can be displaced in the engagement holes 59 and 59. Further, at a plurality of locations in the circumferential direction of the displacement side peripheral wall portion 62 (for example, two to three positions at equal intervals in the circumferential direction) from the outer peripheral surface of the displacement side peripheral wall portion 62, Each of the locking pieces 64 and 64 is formed so as to protrude in a protruding state.

In such a case unit 51, a flange portion 47 provided at an intermediate portion of the drive spindle 45, the axial force sensor 49, the thrust rolling bearing 48, and the elastic member 50 are incorporated, and FIG. Axial force measuring unit 65 as shown in A) and FIG. 6A and 6B, the arrow R is the inner side, and the arrow L is the outer side.
As shown in FIG. 2, the axial force measuring unit 65 is assembled to the inner end of the cylinder space 66 provided in the inner side portion of the caliper 2a. A concave groove 67 that opens to the inner diameter side and the outer side of the cylinder space 66 is formed in a portion of the rear end portion of the cylinder space 66 that is aligned with the end portion of the connector 57. To prevent interference with the parts. In addition, a locking recess 68 is formed on almost the entire periphery of the cylinder space 66 near the back end of the intermediate portion except for the recess 67 portion.

The axial force measuring unit 65 is pushed into the inner end of the cylinder space 66 while elastically compressing the elastic member 50 in the axial direction and the locking pieces 64 and 64 inward in the radial direction. . Then, in the state after the completion of pushing, the leading edge of each of the locking pieces 64, 64 is abutted against the inner side surface of the locking recess 68 by the elasticity of the elastic member 50. In this state, the outer side case 53 is not displaced in the direction of coming out of the cylinder space 66 (outer side (arrow L side in FIGS. 6 (A) and 6 (B))). 49 is in a state where a sufficient preload is applied to ensure measurement accuracy. Therefore, the plug 71 provided at the end of the harness 70 is inserted into the cylinder space 66 through the connection hole 69 formed in the caliper 2a, the plug 71 and the connector 57 are connected, and the axial force sensor 49 is connected. The measurement signal can be extracted.

In this way, the thrust generation is performed by combining the feed screw mechanism 23 and the ball ramp mechanism 24 between the axial force measuring unit 65 and the inner pad 6a assembled at the inner end of the cylinder space 66. A mechanism 25 is provided. Of these, the feed screw mechanism 23 is screwed into a male screw portion 72 provided in the outer half portion (left half portion in FIG. 2) of the drive spindle 45 with a screw hole 74 provided in the center portion of the drive side rotor 73. It is composed by letting. The ball ramp mechanism 24 includes the drive side rotor 73, the driven side rotor 75, and a plurality of balls 76. The driving-side rotor 73 and the driven-side rotor 75 have a plurality of circumferential positions on the surfaces facing each other at a plurality of positions (for example, three to four positions), each having an arc shape when viewed in the axial direction. There are provided driving side lamp parts 77 and 77 and driven side lamp parts 78 and 78.

The depth in the axial direction of each of the driving side lamp parts and the driven side lamp parts 77 and 78 is gradually changed with respect to the circumferential direction, but the direction of the change is that of each of the driving side lamp parts 77 and 77 and each of the above. The driven side lamp portions 78 and 78 are in opposite directions. Accordingly, when the drive-side rotor and the driven- side rotors 73 and 75 are relatively rotated, and the balls 76 and 76 are rolled along the drive-side ramp portions and the driven- side ramp portions 77 and 78, The distance between the drive-side rotor and the driven- side rotors 73 and 75 is expanded and contracted with a large force. A spacer 79 that is spherically engaged with the driven-side rotor 75 is sandwiched between the driven-side rotor 75 and the inner pad 6a. Furthermore, a part of the engagement protrusion 80 projecting from the outer peripheral edge of the driven-side rotor 75 and a part of the concave groove 67 are engaged via a sleeve 92, and the driven-side rotor 75 is driven by the drive. Around the tip of the spindle 45, it is supported so that it can be displaced in the axial direction while being prevented from rotating.

At the time of braking by the electric disc brake device with parking mechanism 101 of the first example of the present embodiment configured as described above, the output shaft 35 is rotated by energizing the electric motor 8a, and the speed reduction mechanism 9a. Then, the drive spindle 45 of the thrust generating mechanism 25 is driven to rotate. At the initial stage of this rotational drive, the drive-side rotor 73 does not rotate due to the resistance of the biasing spring 81 or the like, and the front end side of the drive spindle 45 is based on the threaded engagement between the male screw portion 72 and the screw hole 74. In parallel (moves toward the brake rotor 5 without rotating). By this parallel movement, a gap between the both side surfaces in the axial direction of the brake rotor 5 and the inner pad 6a and the outer pad 6b is closed. During such parallel movement, each of the balls 76 and 76 is located at an end portion on the deepest side of each of the driving side ramp portions and the driven side ramp portions 77 and 78.

As a result of the parallel movement, gaps between the respective parts are lost, and when the resistance of the drive side rotor 73 to move further toward the brake rotor 5 increases, the drive side rotor 73 rotates together with the drive spindle 45. Then, the drive side rotor 73 and the driven side rotor 75 rotate relative to each other. Then, the balls 76 and 76 move to the shallower side of the driving-side ramp portions and the driven- side ramp portions 77 and 78 while rolling, and both the driving-side rotor and the driven-side rotor 73 are moved. , 75 interval increases. Since the inclination angle of each of the driving side lamp portions and the driven side lamp portions 77 and 78 is loose, the force for widening the distance between the both driving side rotors and the driven side rotors 73 and 75 increases, and the inner pad 6a and The outer pad 6b is pressed against the both side surfaces of the brake rotor 5 with a large force by the spacer 79 and the caliper claw 11a to perform braking.
The magnitude of the braking force is adjusted by regulating the energization amount to the electric motor 8a and adjusting the torque input from the output shaft 35 to the thrust generating mechanism 25 via the speed reduction mechanism 9a. During operation of such a service brake device, the tip side of the restraining side engaging member 28 is retracted from the rotating side engaging member 27 as shown in FIG. Therefore, the restraining side engaging member 28 does not affect the operation of the electric pressing device 21 including the electric motor 8a.
Further, in order to perform braking in this way, the adjustment of the magnitude of the force pressing the inner pad 6a and the outer pad 6b against the both side surfaces of the brake rotor 5 is a feedforward control for adjusting the amount of current supplied to the electric motor 8a. In addition to this, it can also be performed by feedback control based on the measurement signal of the axial force sensor 49.

When the parking mechanism for maintaining the vehicle in a stopped state is activated, the electric pressing device 21 presses the inner pad 6a and the outer pad 6b against both side surfaces of the brake rotor 5 to generate a braking force. The solenoid 13a is energized. Based on this energization, the restraining side engaging member 28 is displaced in a direction approaching the rotating side engaging member 27. Then, as shown in FIG. 4B, rotation of the restraining side uneven portion 39 of the restraining side engaging recess 38 of the restraining side engaging member 28 and the rotating side engaging portion 36 of the rotating side engaging member 27 is performed. The side uneven portion 37 is engaged with the rotation direction of the rotation side engagement member 27.

In the case of the first example of the present embodiment, the locking recess 40 formed at the center of the bottom surface of the restraining side engaging recess 38 of the restraining side engaging member 28 has a tip portion extending from the bottom surface to the rotation side engaging member. The first elastic member 29 is mounted so as to protrude in the direction of the combined member 27. For this reason, before the inhibition side uneven part 39 and the rotation side uneven part 37 are engaged, the front end surface of the first elastic member 29 and the rotation side engagement part of the inhibition side engagement member 28 are engaged. The front end surface of 36 abuts. Further, when the restraining side engaging member 28 is displaced in the direction, the first elastic member 29 is elastically deformed as shown in FIG. 4 (B) to absorb the impact during the engagement, The inhibition side uneven portion 39 and the rotation side uneven portion 37 are engaged with each other while preventing the occurrence of a collision sound. For this purpose, the elasticity of the first elastic member 29 is made smaller than the thrust of the solenoid 13a.
When the first elastic member 29 is deteriorated, the effect of suppressing the collision noise is deteriorated. Even in this case, the deterioration of the first elastic member 29 is caused by the inhibition side engaging member 28 and the rotation. There is no influence on the engagement of the side engaging member 27 in the rotational direction. For this reason, backlash does not occur in this rotational direction, and the original performance of the parking mechanism does not deteriorate.

When the parking mechanism is operated, the energization to the electric motor 8a constituting the electric pressing device 21 is stopped while the solenoid 13a is energized. Based on the rotation of the output shaft 35 of the electric motor 8a, the thrust generating mechanism 25 and the speed reducing mechanism 9a for pressing the inner pad 6a and the outer pad 6b against both side surfaces of the brake rotor 5 to generate a braking force. Is reversible in terms of force transmission as described above, so that when the electric power to the electric motor 8a is stopped, the rotation-side engagement member 27 is predetermined based on the reaction of the braking force. Tend to rotate in the direction. However, as described above, in a state where the inhibition side uneven portion 39 and the rotation side uneven portion 37 are engaged, the rotation side engaging member 27 does not rotate in the direction of decreasing the braking force. Then, the energization to the solenoid 13a is stopped in a state where the inhibition side uneven portion 39 and the rotation side uneven portion 37 are engaged. In the state where the energization to the solenoid 13a is stopped, the restraining side engaging member 28 stops at the same position (the state shown in FIG. 4B) without being displaced in the axial direction. Therefore, the inhibition side uneven part 39 and the rotation side uneven part 37 remain engaged.

In this way, in a state where the restraining side uneven portion 39 and the rotation side uneven portion 37 are engaged, the inner pad 6a and the outer pad 6b are connected in the axial direction of the brake rotor 5 without energizing any portion. Since it can be kept pressed against both sides, the braking force can be secured without consuming battery power.
In order to release the operation of the parking brake device, the solenoid 13a is energized to move the restraining side engaging member 28 away from the rotating side engaging member 27 as shown in FIG. Displace to. Then, the engagement between the restraining side uneven portion 39 and the rotation side uneven portion 37 is released, and the rotating side engaging member 27 can be rotated, so that the inner pad 6 a and the outer pad 6 b are connected to both sides in the axial direction of the brake rotor 5. The force that was pressing on the surface is lost.

In the first example of the present embodiment, an H-shaped second elastic member 30 is provided at the other end of the plunger 32 of the solenoid 13a. The second elastic member 30 is opposed to the other end edge of the second elastic member 30 (the other end edge of the pair of side plates 41, 41 constituting the second elastic member 30) and the other end edge. The distance L ₄₃ (see FIG. 5A) from the second receiving surface 43 which is the inner surface of the casing 26 is the other end surface of the large-diameter portion 34 of the plunger 32 (the left end surface in FIG. 5A). The arrangement of the inner surface of the case 31 is restricted so as to be smaller than the distance L ₃₁ (L ₄₃ <L ₃₁ ) between the surface facing the other end surface of the large-diameter portion 34. For this reason, the plunger 32 is displaced in the direction in accordance with the displacement of the restraining side engaging member 28, and the other end surface of the large diameter portion 34 is brought into contact with the inner surface of the case 31 as shown in FIG. As shown, the other end edges of the pair of side plates 41, 41 constituting the second elastic member 30 abut against the second receiving surface 43. When the plunger 32 is further displaced in this direction from this state, the connecting plate 42 constituting the second elastic member 30 is elastically deformed as shown in FIG. In this way, the impact at the time of collision between the large-diameter portion 34 of the plunger 32 and the inner surface of the case 31 is absorbed, and the occurrence of collision noise when the parking mechanism is released is suppressed.

[Second Example of Embodiment]
FIGS. 7A and 7B show a second example of an embodiment of the present invention corresponding to the configurations of (1), (2), and (4) described above. In the case of the second example of the present embodiment, the restraining side engaging member 28a is displaceable in the axial direction with respect to the rotating side engaging member 27a and cannot rotate. Concentric. Moreover, the latching recessed part 40a is formed in the bottom face of the suppression side engagement recessed part 38a of the suppression side engaging member 28a.
A locking projection 82 is formed at the center of the distal end surface of the rotation side engagement portion 36a of the rotation side engagement member 27a. The outer diameter D ₈₂ of the locking projections 82, the same as the inner diameter D _40a of the locking recess 40a, and is slightly smaller (D ₈₂ ≦ D _40a) than the inner diameter D _40a. And the air damper mechanism 83 which confine | air-closes air in this latching recessed part 40a is comprised by fitting with the latching recessed part 40a and the latching convex part 82. As shown in FIG.

During operation of the parking mechanism for maintaining the vehicle in a stopped state, the inner pad 6a and the outer pad 6b are pressed against both side surfaces of the brake rotor 5 by the electric pressing device 21 (see FIG. 2) to generate a braking force. In this state, the solenoid 13a (see FIG. 2) is energized. Based on this energization, the restraining side engaging member 28a is displaced in a direction approaching the rotating side engaging member 27a. Further, the inhibition-side uneven portion 39a of the inhibition-side engagement recess 38a of the inhibition-side engagement member 28a and the rotation-side uneven portion 37a of the rotation-side engagement portion 36a of the rotation-side engagement member 27a are the rotation side. The engagement member 27a is engaged with the rotation direction.

In the case of the second example of the present embodiment, the locking recess 40a formed at the center of the bottom surface of the restraining side engaging recess 38a of the restraining side engaging member 28a and the rotating side engagement of the rotating side engaging member 27a. An air damper mechanism 83 is constituted by a locking projection 82 provided at the center of the front end surface of the joint portion 36a. In the air damper mechanism 83, the inhibition side uneven portion 39a of the inhibition side engagement recess 38a of the inhibition side engagement member 28a and the rotation side uneven portion 37a of the rotation side engagement portion 36a of the rotation side engagement member 27a are provided. Before the engagement, as shown in FIG. 7B, the tip of the locking projection 82 is inserted into the locking recess 40a. Then, air is trapped in the locking recess 40a. Further, when the restraining side engaging member 28a is displaced in the direction, the air in the locking recess 40a is little by little between the inner peripheral surface of the locking recess 40a and the outer peripheral surface of the locking projection 82. Leak through the gap. For this reason, the inhibition-side uneven portion 39a and the rotation-side uneven portion 37a are engaged with each other slowly, so that the impact at the time of the engagement can be absorbed and the occurrence of collision noise can be prevented.
Except for the differences in the shape and structure of the rotation-side engagement member 27a and the restraining-side engagement member 28a, they are the same as those in the first example of the above-described embodiment, and thus illustrations and explanations regarding equivalent parts are omitted.

[Third example of embodiment]
8 and 9 show a third example of the embodiment of the present invention corresponding to the configurations of (1), (2), (5) and (7) described above. In the case of the electric disc brake device with a parking mechanism (electric brake device with a parking mechanism) 201 of the third example of the present embodiment, the gear-shaped irregularities are formed on the outer peripheral surface of the rotation side engaging member 27b over the entire circumference. A portion 84 is formed.
The restraining side engaging member 28b is provided on a virtual plane existing in a direction perpendicular to the central axis of the rotating side engaging member 27b so that the rotating side engaging member 27b can be displaced in the radial direction. Yes. Further, the restraining side engaging member 28b engages with the recesses 85, 85 of the concavo-convex part 84 of the rotating side engaging member 27b at the tip part (can enter into any of the concave parts 85). A convex portion 86 is provided. Further, an elastic member 87 is provided at the tip of the engaging convex portion 86. The elastic member 87 can also be provided at the bottom of each of the recesses 85 and 85 constituting the uneven portion 84.

When the parking brake device for maintaining the vehicle in a stopped state is operated, the electric pressing device 21 presses the inner pad 6a and the outer pad 6b against both side surfaces of the brake rotor 5 (see FIG. 2) to generate a braking force. Thus, the solenoid 13a is energized. Based on this energization, the restraining side engaging member 28b is displaced in a direction approaching the rotating side engaging member 27b (downward direction in FIGS. 8 and 9). And the engagement convex part 86 of the said suppression side engaging member 28b and the any recessed part 85 which comprises the uneven | corrugated | grooved part 84 of the said rotation side engaging member 27b engage.

In the case of the third example of the present embodiment, an elastic member 87 is provided at the tip of the engaging convex portion 86 of the restraining side engaging member 28b. For this reason, before the engagement convex part 86 of the said restraining side engaging member 28b and the recessed part 85 of the uneven | corrugated | grooved part 84 of the said rotation side engaging member 27b engage, the front end surface of the said elastic member 87 And the bottom of the recess 85 abut. Furthermore, the elastic member 87 is elastically deformed in the process in which the restraining side engaging member 28b enters the concave portion 85, so that the impact at the time of the engagement can be absorbed and the generation of the collision sound can be prevented.
Note that, as in the third example of the present embodiment, if the restraining side engaging member 28b is arranged on a virtual plane that exists in a direction perpendicular to the central axis of the rotating side engaging member 27b, this rotation A space in the axial direction of the side engagement member can be reduced.
Except for the differences in shape, structure, and arrangement of the rotation-side engaging member 27b and the restraining-side engaging member 28a, they are the same as those in the first and second examples of the above-described embodiment, and thus illustrations and explanations regarding equivalent parts are omitted. To do.

[Fourth Example of Embodiment]
FIGS. 10A to 10B show a fourth example of the embodiment of the invention corresponding to the above-described (1), (2), (6), and (7). In the case of the fourth example of the present embodiment, an elastic member 88 is attached to the other end of the plunger 32 constituting the solenoid 13a. The elastic member 88 has the same structure as that of the second elastic member 30 shown in FIG. 5A. The first elastic member 29 and the second elastic member 29 shown in FIG. The arrangement of the elastic member 88 is devised so as to have the function of the member 30.
Such an elastic member 88 is one end edge of the elastic member 88 (one end edge of the pair of side plates 90 and 90 constituting the elastic member 88) and the outer surface of the case 31 of the solenoid 13a facing the one end edge. receiving surface distance L ₈₉ between 89, restraining side engaging member 28c of the restraining side engaging recess 38c and smaller than the stroke L ₂₇ of the rotating side engaging member 27c until as possible engaged (L ₈₉ <L ₂₇ )

During the operation of the parking brake device for maintaining the vehicle in a stopped state, the electric pressing device 21 presses the inner pad 6a and the outer pad 6b against both side surfaces of the brake rotor 5 (see FIG. 2) to generate a braking force. In this state, the solenoid 13a is energized. Based on this energization, the restraining side engaging member 28c is displaced in the direction approaching the rotating side engaging member 27c (the right direction in FIG. 10A). Further, the inhibition-side uneven portion 39c of the inhibition-side engagement recess 38c of the inhibition-side engagement member 28c and the rotation-side uneven portion 37c of the rotation-side engagement portion 36c of the rotation-side engagement member 27c are the rotation side. The engagement member 27c is engaged in the rotation direction.

In the case of the fourth example of the present embodiment, the distance between one end edge of the pair of side plates 90, 90 constituting the elastic member 88 and the receiving surface 89 which is the outer surface of the case 31 of the solenoid 13a facing the one end edge. L ₈₉ has been smaller than the stroke L ₂₇ to restraining side engaging recess 38c of the restraining side engaging member 28c and said rotating side engaging member 27c Kiru engaged (L ₈₉ <L _27). For this reason, before the restraining side uneven part 39c of the restraining side engaging recessed part 38c of the restraining side engaging member 28c contacts with the rotating side uneven part 37c of the rotating side engaging member 27c rotating side engaging part 36c. As shown in FIG. 10B, one end edge of the side plate of the elastic member 88 (one end edge of the pair of side plates 90, 90) abuts on the receiving surface 89. Further, in the process in which the restraining side engaging member 28c and the plunger 32 are displaced until they completely engage the restraining side uneven portion 39c and the rotating side uneven portion 37c, the connecting plate 91 constituting the elastic member 88 is As shown in FIG. 10C, it is elastically deformed. As a result, the inhibition-side uneven portion 39c and the rotation-side uneven portion 37c are slowly engaged with each other to absorb the impact when the inhibition-side uneven portion 39c and the rotation-side uneven portion 37c are engaged with each other. Also prevents the occurrence of.

In the case of the fourth example of the present embodiment, similarly to the structure shown in FIG. 5A, the other end edge of the elastic member 88 (the other end edge of the pair of side plates 90, 90), The distance L ₄₃ between the second receiving surface 43 in the configuration of (7) and the caliper 2a facing the other end edge or the inner surface of the casing 26 or the like is the large diameter portion 34 of the plunger 32. Is smaller than the distance L ₃₁ between the other end surface (the left end surface in FIG. 10A) and the inner surface of the case 31 of the solenoid 13a facing the other end surface of the large diameter portion 34 (L ₄₃ < L ₃₁ ). For this reason, the impact at the time of a collision with the large diameter part 34 of the said plunger 32 and the inner surface of the said case 31 is absorbed, and generation | occurrence | production of a collision sound can also be prevented.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
The present application is based on a Japanese patent application filed on March 17, 2011 (Japanese Patent Application No. 2011-058733), the contents of which are incorporated herein by reference.

The structure of the parking lock device of each of the above embodiments is a structure in which the present invention is applied to an electric disc brake, but can also be applied to an electric drum brake. That is, the present invention can be applied to various structures that generate a braking force using an electric motor as a drive source and lock the rotation of the output shaft of the electric motor in order to maintain the braking force.

101, 201 Electric disc brake device with parking mechanism (electric brake device with parking mechanism)
2, 2a Caliper 3 Support (support member)
4 Piston 5 Brake rotor (braking rotor)
6a, 6b Pad (braking friction member)
7 Ball ramp mechanism 8, 8a Electric motor 9, 9a Deceleration mechanism 10 Motor rotor 11, 11a Caliper claw 12 Lock mechanism 13, 13a Solenoid (electric actuator)
14 engaging claw member
15 Claw wheel 16 Inner member 17 Outer member 18 Elastic member 19 Engaging claw portion 20 Claw portion 21 Electric pressing device 22 Locking device for parking 23 Feed screw mechanism 24 Ball ramp mechanism 25 Thrust generating mechanism 26 Casings 27, 27a, 27b, 27c Rotating side engaging members 28, 28a, 28b, 28c Deterring side engaging member 29 First elastic member (buffer mechanism)
30 Second elastic member (buffer mechanism)
31 Case 32 Plunger (displacement member)
33 Through-hole 34 Large-diameter portion 35 Output shaft 36, 36a, 36b, 36c Rotating- side engaging portion 37, 37a, 37b, 37c Rotating-side concavo- convex portion 38, 38a, 38b, 38c Suppression-side engaging recessed portion 39, 39a, 39b , 39c Suppression concave- convex portion 40, 40a Locking concave portion 41 Side plate 42 Connecting plate 43 Second receiving surface 44 Reduction small gear 45 Driving spindle 46 Reduction large gear 47 Gutter 48 Thrust rolling bearing 49 Axial force sensor 50 Elastic member 51 Case Unit 52 Inner side case 53 Outer side case 54 Through hole 55 Bottom plate portion 56 Fixed side peripheral wall portion 57 Connector 58 Extraction hole 59 Locking hole 60 Through hole 61 Bottom plate portion 62 Displacement side peripheral wall portion 63 Engagement piece 64 Locking piece 65 Shaft Force measuring unit 66 Cylinder space 67 Concave groove 68 Locking concave part 69 Connection hole 70 Harness 71 Plug 72 Male thread part 73 Drive-side rotor 4 the screw hole 75 driven side rotor 76 ball 77 drive-side ramp portion 78 driven side ramp portion 79 between the seat 80 engages protrusion 81 biasing spring 82 the locking projections 83 air damper mechanism (buffering mechanism)
84 Concave and convex part 85 Concave part 86 Engaging convex part 87 Elastic member (buffer mechanism)
88 Elastic member (buffer mechanism)
89 Receiving surface 90 Side plate 91 Connecting plate 92 Sleeve

Claims (9)

1. A braking rotator that rotates with the wheels;
   A support member supported by a non-rotating portion in a state adjacent to the braking rotator,
   A brake friction member supported on a part of the support member so as to be capable of moving in a distance with respect to the brake rotator while facing a part of the brake rotator;
   An electric pressing device that uses an electric motor as a drive source and moves the braking friction member in a direction approaching the braking rotating body via a speed reduction mechanism;
   A parking mechanism-equipped electric brake device comprising: a parking lock device for maintaining the braking friction member pressed against the braking rotor after energization of the electric motor is stopped. And
   The parking lock device comprises:
   A rotation-side engagement member that is fixed to a part of a rotation shaft that rotates with energization of the electric motor and has a rotation-side engagement surface concentric with the rotation shaft;
   The support member is supported in a state in which the displacement in the direction of moving toward and away from the rotation-side engagement surface is possible directly or through another member, and the rotation around the rotation axis is prevented, A deterring-side engaging member that is configured to be detachable from the rotating-side engaging surface;
   An electric actuator that applies a force in a direction approaching the rotation-side engagement member to the inhibition-side engagement member based on energization, and
   At least one engagement member of the inhibition side engagement member and the rotation side engagement member or a part of a displacement member displaced in synchronization with the one engagement member, the engagement member or the displacement member Is provided between the engaging member and the mating member, and the relative displacement speed between the engaging member and the mating member is reduced before the restraining side engaging member and the rotating side engaging member are engaged with each other. An electric brake device with a parking mechanism provided with a buffer mechanism that reduces the impact force during the engagement by acting as much as possible.
2. The electric brake device with a parking mechanism according to claim 1, wherein the rotating shaft to which the rotating side engaging member is fixed is an output shaft of the electric motor.
3. The restraining side engaging member is concentrically displaceable in the axial direction with respect to the rotating side engaging member and is not rotatable.
   The buffer mechanism is configured by an elastic member provided at a part of at least one of the restraining side engaging member and the rotating side engaging member and at a portion facing the counterpart member. Is,
   The electric brake device with a parking mechanism according to claim 1 or 2, wherein the elastic member abuts a part of the counterpart member before the restraining side engaging member and the rotating side engaging member are engaged.
4. The restraining side engaging member is provided concentrically with the rotating side engaging member in a state in which the inhibiting side engaging member is axially displaceable and non-rotatable with respect to the rotating side engaging member;
   An air damper mechanism in which the buffer mechanism is constituted by a concave portion provided in one of the restraining side engaging member or the rotating side engaging member and a convex portion provided in the other engaging member. And
   The parking mechanism according to claim 1 or 2, wherein the convex portion and the concave portion are engaged to confine air in the concave portion before the inhibition side engaging member and the rotating side engaging member are engaged. With electric brake device.
5. The rotation-side engagement member is formed with a gear-like uneven portion on the entire circumference of the outer peripheral surface,
   The restraining side engaging member includes an engaging convex portion that engages with a concave portion of the concave and convex portions of the rotating side engaging member, and is present in a direction perpendicular to the central axis of the rotating side engaging member. On the plane,
   The buffer mechanism is constituted by an elastic member provided on at least one of a front end portion of the engaging convex portion of the restraining side engaging member and a bottom portion of the concave portion of the concave and convex portion;
   Before the engaging convex part of the restraining side engaging member engages with the concave part of the concave and convex part of the rotating side engaging member, the elastic member is formed between the concave part and the tip of the engaging convex part. The electric brake device with a parking mechanism according to claim 1 or 2, wherein the electric brake device is sandwiched between the two.
6. The actuator is a solenoid that linearly moves the plunger based on energization;
   The solenoid includes a coil, a case, and a plunger,
   The plunger is supported by the case so as to be axially displaceable and non-rotatable. One end and the other end of the plunger are provided to the outside of the case from a pair of through holes provided concentrically at both ends of the case. Protruded, and a part of the intermediate part is a large diameter part having an outer diameter larger than the inner diameter of the through hole,
   The restraining side engaging member is provided at one end portion of the plunger so as not to rotate and to be able to be displaced in the axial direction together with the plunger.
   The other end of the plunger is provided with an elastic member constituting the buffer mechanism,
   The electric motor with a parking mechanism according to claim 1 or 2, wherein the elastic member abuts on an outer surface of an end of the case, which is a receiving surface, before the restraining side engaging member and the rotating side engaging member are engaged. Brake device.
7. The actuator is a solenoid that linearly moves the plunger based on energization;
   The solenoid includes a coil, a case, and a plunger,
   The plunger is supported by the case so as to be axially displaceable and non-rotatable. One end and the other end of the plunger are provided to the outside of the case from a pair of through holes provided concentrically at both ends of the case. Protruded, and a part of the intermediate part is a large diameter part having an outer diameter larger than the inner diameter of the through hole,
   The restraining side engaging member is provided at one end portion of the plunger so as not to rotate and to be able to be displaced in the axial direction together with the plunger.
   The other end of the plunger is provided with an elastic member,
   3. The elastic member abuts against a second receiving surface present in a portion facing the case before the other end edge of the large diameter portion abuts against the inner surface of the other end of the case. Electric brake device with parking mechanism.
8. The actuator is a solenoid that linearly moves the plunger based on energization;
   The solenoid includes a coil, a case, and a plunger,
   The plunger is supported by the case so as to be axially displaceable and non-rotatable. One end and the other end of the plunger are provided to the outside of the case from a pair of through holes provided concentrically at both ends of the case. Protruded, and a part of the intermediate part is a large diameter part having an outer diameter larger than the inner diameter of the through hole,
   The restraining side engaging member is provided at one end portion of the plunger so as not to rotate and to be able to be displaced in the axial direction together with the plunger.
   The other end of the plunger is provided with an elastic member,
   The parking according to claim 5, wherein the elastic member abuts on a second receiving surface present in a portion facing the case before the other end edge of the large diameter portion abuts on an inner surface of the other end portion of the case. Electric brake device with mechanism.
9. The actuator is a solenoid that linearly moves the plunger based on energization;
   The solenoid includes a coil, a case, and a plunger,
   The plunger is supported by the case so as to be axially displaceable and non-rotatable. One end and the other end of the plunger are provided to the outside of the case from a pair of through holes provided concentrically at both ends of the case. Protruded, and a part of the intermediate part is a large diameter part having an outer diameter larger than the inner diameter of the through hole,
   The restraining side engaging member is provided at one end portion of the plunger so as not to rotate and to be able to be displaced in the axial direction together with the plunger.
   The other end of the plunger is provided with an elastic member,
   The parking according to claim 6, wherein the elastic member abuts on a second receiving surface existing in a portion facing the case before the other end edge of the large diameter portion abuts on an inner surface of the other end of the case. Electric brake device with mechanism.

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