JP2018185053A - Actuator for brake and brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize easy compatibility with reduction in size and weight by enhancing rigidity of a case without lowering molding accuracy of the case.SOLUTION: A motor storage part 24 includes a reinforcement rib 24d extending from one end in an axial direction of the motor storage part 24 to the other end in the axial direction. The reinforcement rib 24d is arranged on the side where a caliper fixing part 23 of the motor storage part 24 exists. Therefore, rigidity of a case 21 is enhanced, and it can be suppressed that the caliper fixing part 23 and the motor storage part 24 are twisted with each other when an electric motor 30 is driven. The size and weight of the case 21 can be reduced, and also, generation of operation sound and change in backlash of a gear of a speed reduction mechanism 50 can be suppressed. Even when the case 21 is produced by injection molding with resin material, it can be suppressed that the motor storage part 24 falls down to the side of caliper fixing part 23 due to shrinkage and the like, thus molding accuracy of the case 21 is improved, problems in manufacturing are overcome and the yield can be improved.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a brake actuator that is provided in a brake device and drives a piston that presses a pad.

  A vehicle such as an automobile is provided with a brake device corresponding to each wheel. A disc brake widely adopted as a brake device includes a rotor (disk) that rotates together with an axle, a pair of pads (friction materials) that are arranged to face each other with the rotor interposed therebetween, and a claw that presses one pad toward the rotor. And a caliper including a piston that presses the part and the other pad toward the rotor. Then, when the driver operates the brake pedal, the brake fluid is supplied to the caliper and the piston moves toward the rotor. Accordingly, the pair of pads are pressed against each other so as to sandwich the rotor, and a braking force is generated.

  By the way, with the advancement of automobile technology, instead of the development of the mechanical brake device that operates by the hydraulic pressure of the brake fluid as described above, the development of an electric brake device having an actuator controlled by an electric signal has been developed. Progressing. This brake device eliminates the need for a master cylinder, hydraulic piping, a booster device, and the like, so that the entire device can be reduced in size and weight, and the braking force can be controlled with high accuracy. Therefore, for example, the present invention can be easily applied to a vehicle having an automatic tracking function that automatically controls acceleration force and braking force according to the behavior of another vehicle traveling ahead. In addition, development of an electric parking brake device having a function of a foot brake device that can obtain a braking force by a driver's operation of a brake pedal as a brake device is also progressing.

  Such an electric brake device is described in Patent Document 1, for example. The brake device described in Patent Document 1 includes an electric parking brake device. The brake device of Patent Document 1 has a mounting (bracket) fixed to the vehicle body, and a brake housing (caliper) provided on the mounting via a pair of slide pins.

  The brake housing has a U-shaped cross section so as to straddle the disk rotor, and is movable in the axial direction of the disk rotor. The brake housing includes a claw portion that holds one pad and a piston that presses the other pad. The piston is driven by an electric motor that is operated by operating a parking brake switch provided in the passenger compartment.

  The electric motor is provided in parallel to the cylinder portion that movably accommodates the piston, and is accommodated in a gear body (case) formed in a substantially L shape. A reduction mechanism that reduces the rotation of the electric motor to increase the torque is housed in the gear body. This makes it possible to employ a small electric motor and suppresses an increase in the axial dimension of the cylinder portion, thereby improving the mounting property on the vehicle. As the gear body, resin is often used from the viewpoint of weight reduction and weather resistance of the vehicle's undercarriage.

JP 2012-229741 A

  However, the electric brake device described in Patent Document 1 described above includes a case made of resin and having a substantially L-shaped cross section, and an electric motor and a speed reduction mechanism are accommodated therein. . Thereby, when the brake device is operated, the case may be twisted and distorted. When the case is twisted, problems such as an increase in operating noise of the brake device and a change in backlash between gears forming the speed reduction mechanism occur.

  Therefore, it is conceivable to increase the rigidity of the case by increasing the thickness of the case, but simply increasing the thickness of the case increases the weight of the case itself, and in addition to removing sink marks and voids after injection molding. It can also cause it to occur. When these sink marks, voids, etc. occur, the molding accuracy of the case is remarkably reduced, and problems such as the case rigidity greatly varying from product to product arise.

  An object of the present invention is to provide a brake actuator and a brake device that can easily cope with a reduction in size and weight by increasing the rigidity of the case without lowering the molding accuracy of the case.

  The brake actuator according to the present invention is a brake actuator that drives a piston that is movably held by a caliper, and is provided side by side with an electric motor having a rotating shaft and the power of the electric motor. An output shaft that transmits the torque to the piston, a speed reduction mechanism provided between the rotation shaft and the output shaft, a case that houses the electric motor and the speed reduction mechanism, and the output shaft of the case are disposed. A caliper fixing portion provided in a portion and fixed to the caliper; and a motor housing portion provided in a portion where the rotating shaft of the case is disposed and housing the electric motor, and the motor housing portion The axial length of the motor housing portion is longer than the axial length of the caliper fixing portion. The reinforcing rib is disposed on the side where the caliper fixing portion of the motor accommodating portion is located, and is opposite to the reinforcing rib side of the motor accommodating portion along the longitudinal direction of the case. In addition, a connector connecting portion to which the vehicle side connector is connected is provided, and the motor housing portion is arranged in the connecting direction of the vehicle side connector.

  In the brake device according to the present invention, a rotor, a pad pressed against the rotor, a piston that presses the pad, a caliper that holds the piston movably, and an actuator that is provided in the caliper and drives the piston The actuator includes an electric motor having a rotating shaft, an output shaft that is provided along with the rotating shaft, and transmits the power of the electric motor to the piston, and the rotating shaft. A caliper fixed to the caliper, provided at a portion where the output shaft of the case is disposed, and a speed reduction mechanism provided between the output motor and the output shaft, a case housing the electric motor and the speed reduction mechanism And a motor housing portion that is provided at a portion of the case where the rotating shaft is disposed and houses the electric motor. The axial length of the motor accommodating portion is longer than the axial length of the caliper fixing portion, and the motor accommodating portion is a reinforcement extending from one axial end of the motor accommodating portion to the other axial end. A rib is provided, and the reinforcing rib is disposed on a side where the caliper fixing portion of the motor accommodating portion is provided, and on the side opposite to the reinforcing rib side of the motor accommodating portion along the longitudinal direction of the case, a vehicle side connector is provided. Is provided, and the motor housing portion is arranged in the connection direction of the vehicle-side connector.

  In another aspect of the present invention, the connector connecting portion is arranged on a straight line passing through the axis of the caliper fixing portion and the axis of the motor housing portion.

  In another aspect of the present invention, the pair of reinforcing ribs are arranged so as to be symmetrical about a straight line passing through the axis of the caliper fixing part and the axis of the motor housing part.

  In another aspect of the present invention, a fixing portion fixed to the caliper is provided on a radially outer side of the caliper fixing portion, and the reinforcing rib is fixed when the motor accommodating portion is viewed from the axial direction. It protrudes toward the part.

  In another aspect of the present invention, the reinforcing rib is disposed at a position avoiding a cylinder portion constituting a part of the caliper.

  In another aspect of the present invention, an outer peripheral wall portion is provided on the radially outer side of the caliper fixing portion, and the reinforcing rib is provided toward the outer peripheral wall portion.

  In another aspect of the present invention, the caliper fixing portion is provided with a plurality of meat stealing portions, and the reinforcing ribs are not overlapped with the meat stealing portions when the motor housing portion is viewed from the axial direction. Is provided.

  In another aspect of the invention, the plurality of meat stealers are partitioned by radial ribs provided radially around the output shaft.

  In another aspect of the present invention, a cross section of the reinforcing rib is formed in a triangular shape.

  According to the present invention, the motor housing portion includes a reinforcing rib extending from one axial end of the motor housing portion to the other axial end, and the reinforcing rib is disposed on the side of the motor housing portion where the caliper fixing portion is present. ing.

  Thereby, the rigidity of a case can be improved and it can suppress that a caliper fixing | fixed part and a motor accommodating part mutually twist at the time of the drive of an electric motor. Therefore, the case can be further reduced in size and weight, and the generation of operating noise and the change in the backlash of the gear of the speed reduction mechanism can be suppressed.

  Moreover, even if the case is injection-molded with a resin material, the motor housing portion can be prevented from falling to the caliper fixing portion due to sink marks or the like. Accordingly, it is possible to improve the molding accuracy of the case, eliminate the manufacturing problem, and improve the yield.

It is a perspective view showing an outline of a brake device concerning the present invention. It is the top view which looked at the brake device (rotor abbreviation) of Drawing 1 from the direction of arrow A. It is a partial expanded sectional view which follows the BB line of FIG. It is a perspective view which shows an actuator single-piece | unit. FIG. 5 is a plan view of the actuator of FIG. 4 viewed from the direction of arrow C. It is sectional drawing which follows the DD line | wire of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an outline of a brake device according to the present invention, FIG. 2 is a plan view of the brake device (rotor omitted) of FIG. 1 as viewed from the direction of arrow A, and FIG. FIG. 4 is a perspective view showing the actuator alone, FIG. 5 is a plan view of the actuator shown in FIG. 4 viewed from the direction of arrow C, and FIG. 6 is a cross section taken along the line DD in FIG. Each figure is shown.

  As shown in FIGS. 1 to 3, the brake device 10 includes an electric parking brake device (Electric Parking Brake) and is attached to a vehicle axle (not shown) so as to be integrally rotatable. It has. The rotor 11 includes a rotor main body 11a having a plurality of hub bolts 12 (four in the drawing) and a disk portion 11b provided integrally on the outer side in the radial direction of the rotor main body 11a. The disk part 11b forms a friction surface sandwiched between a pair of pads 13a and 13b. A wheel (not shown) is attached to the rotor body 11a, and a wheel nut (not shown) is screwed to each hub bolt 12.

  The brake device 10 includes a mounting bracket 14 that is fixed to a non-rotating portion (not shown) such as a knuckle of a vehicle. The mounting bracket 14 is formed in a predetermined shape by casting, and is integrally provided with a pair of pin mounting portions 14a to which the pair of slide pins 15 are slidably mounted. Each pin mounting portion 14 a extends in the axial direction of the rotor 11, and each slide pin 15 is movable in the axial direction of the rotor 11. A bridging portion 14 b is integrally provided between each pin mounting portion 14 a, and each pin mounting portion 14 a is arranged with a predetermined interval in the circumferential direction of the rotor 11.

  The brake device 10 includes a caliper 16 that is movably attached to the mounting bracket 14. The caliper 16 is formed into a predetermined shape by casting as with the mounting bracket 14, and includes a caliper body 16a and a pair of pin fixing portions 16b. The caliper body 16a has a substantially U-shaped cross section so as to straddle the disk portion 11b of the rotor 11, and includes a claw portion 16c, a cylinder portion 16d, and a connecting portion 16e. The connecting part 16e connects the claw part 16c and the cylinder part 16d.

  The claw portion 16 c is disposed on the hub bolt 12 side along the axial direction of the rotor 11, and the cylinder portion 16 d is disposed on the opposite side to the hub bolt 12 side along the axial direction of the rotor 11. Here, on the side opposite to the hub bolt 12 side along the axial direction of the rotor 11, a shock absorber (not shown) for attenuating the vibration of the vehicle is arranged. Therefore, the brake device 10 is fixed to the vehicle while avoiding the shock absorber.

  As shown in FIG. 3, the cylinder portion 16d is formed in a bottomed cylindrical shape, and a piston 17 is slidably provided inside the cylinder portion 16d. That is, the piston 17 is movably held by the caliper 16 and slides in the axial direction of the rotor 11. Here, the radially inner side of the cylinder portion 16d is smoothed by cutting or polishing, and the piston 17 can slide smoothly.

  Brake fluid (not shown) is supplied to the inside of the cylinder portion 16d and to the back side (right side in the drawing) of the piston 17 by operating a brake pedal (not shown). Yes. In other words, during normal braking by the driver's operation of the brake pedal, braking force is generated by supplying brake fluid.

  As shown in FIG. 1, the pair of pin fixing portions 16b are provided on the radially outer side of the cylinder portion 16d so as to protrude in opposite directions so as to face each other. Bolts 18 are respectively inserted into the distal end portions of the pin fixing portions 16b, and these bolts 18 are fixed to the slide pins 15, respectively. Thereby, the caliper 16 is movable in the axial direction of the rotor 11 with respect to the mounting bracket 14.

  As shown in FIG. 3, the claw portion 16c presses one pad (outer pad) 13a on the hub bolt 12 side of the disc portion 11b toward the disc portion 11b. Further, the piston 17 presses the other pad (inner pad) 13b on the side opposite to the hub bolt 12 side of the disk part 11b toward the disk part 11b.

  More specifically, when brake fluid is supplied to the back side of the piston 17 by the driver's brake pedal operation, the piston 17 is pushed out from the inside of the cylinder portion 16d and moves to the left in FIG. . As a result, the piston 17 presses the pad 13b toward the disk portion 11b. On the other hand, the caliper 16 moves to the right in FIG. 3 with respect to the mounting bracket 14 by the reaction force when the piston 17 presses the pad 13b. Thereby, the claw part 16c presses the pad 13a toward the disk part 11b.

  The piston 17 is hollow, and a feed screw mechanism 17a (not shown in detail) is accommodated therein. The feed screw mechanism 17 a includes a male screw member 17 b that is rotated forward and backward by the actuator 20. The feed screw mechanism 17a includes a female screw member (not shown) to which the male screw member 17b is screwed. Thus, when the driver operates a parking brake switch (not shown) in the vehicle interior, the male screw member 17b is driven to rotate in the forward and reverse directions by the actuator 20, and as a result, the piston 17 is driven forward and backward with respect to the cylinder portion 16d. Is done. The parking brake switch can be operated when the vehicle stops and the vehicle speed is “0 km / h”.

  As shown in FIGS. 1 to 3, the brake device 10 includes an actuator (brake actuator) 20 that drives a feed screw mechanism 17a. The actuator 20 is fixed to the bottom side of the cylinder portion 16d opposite to the rotor 11 side. Hereinafter, the structure of the actuator 20 that operates when the parking brake switch is operated will be described in detail with reference to the drawings.

  As shown in FIGS. 4 to 6, the actuator 20 includes a case 21 formed in a substantially L shape. The opening 21 a (see FIGS. 3 and 6) of the case 21 is sealed by the cover 22, thereby preventing rainwater, dust, and the like from entering the case 21. Both the case 21 and the cover 22 are formed in a predetermined shape by injection molding a resin material having excellent heat resistance. An electric motor 30 and a speed reduction mechanism 50 are accommodated in the case 21.

  Here, before describing the detailed structure of the case 21, the structure of the electric motor 30 and the speed reduction mechanism 50 will be described.

  As shown in FIG. 6, the electric motor 30 includes a motor case 31. The motor case 31 is formed in a substantially cylindrical shape with a bottom by pressing a steel plate (magnetic material). Inside the motor case 31, a plurality of magnets 32 (only two are shown in the figure) having a substantially arc-shaped cross section are fixed. Inside these magnets 32, an armature 34 around which a coil 33 is wound is housed rotatably through a predetermined gap (air gap).

  A base end side of an armature shaft (rotation shaft) 35 is fixed to the rotation center of the armature 34. The distal end side of the armature shaft 35 extends to the outside of the motor case 31, and a pinion gear 36 is fixed to the distal end portion of the armature shaft 35. A commutator 37 to which an end portion of the coil 33 is electrically connected is fixed between the armature 34 and the pinion gear 36 along the axial direction of the armature shaft 35. A pair of brushes 38 is in sliding contact with the outer peripheral portion of the commutator 37. Note that the commutator 37 and the brushes 38 are also accommodated in the motor case 31, respectively.

  A drive current is supplied to each brush 38 by operating the parking brake switch when the vehicle is stopped. Then, a drive current is supplied to the coil 33 through the brushes 38 and the commutator 37, thereby generating an electromagnetic force in the armature 34. Therefore, the armature shaft 35 (pinion gear 36) is rotationally driven in a predetermined direction at a predetermined rotational speed. Here, the drive current supplied to each brush 38 is supplied from a vehicle-side connector (not shown) connected to the connector connecting portion 25 provided in the case 21.

  As shown in FIG. 6, the case 21 is provided with an output shaft 39 that is coupled to the male screw member 17 b (see FIG. 3) so as to be integrally rotatable and transmits the power of the electric motor 30 to the piston 17. The output shaft 39 is provided integrally with the planetary carrier 56 that forms the speed reduction mechanism 50, and transmits the torque increased in torque to the male screw member 17b. The armature shaft 35 and the output shaft 39 are provided in the case 21 side by side in parallel, and the speed reduction mechanism 50 is provided between the armature shaft 35 and the output shaft 39.

  In addition, an input-side two-stage gear 40 for transmitting power to an output shaft 39 arranged in parallel with the armature shaft 35 is provided between the speed reduction mechanism 50 and the pinion gear 36. The input-side two-stage gear 40 includes a large-diameter gear 41 that meshes with the pinion gear 36 and a small-diameter gear 42 that meshes with the large-diameter gear 52 of the output-side two-stage gear 51 that forms the reduction mechanism 50. .

  The reduction mechanism 50 is a planetary gear reduction mechanism and has an output-side two-stage gear 51. The output-side two-stage gear 51 includes a large-diameter gear 52 that meshes with the small-diameter gear 42 of the input-side two-stage gear 40 and a small-diameter gear 53 that functions as a sun gear (sun gear). The speed reduction mechanism 50 includes four planetary gears (planetary gears) 54 (only two are shown in the figure). These planetary gears 54 are meshed with both the small-diameter gear 53 and the internal gear 55, respectively.

  Each planetary gear 54 is rotatably supported by a planetary carrier 56 via a support pin 57. The internal gear 55 is fixed to the case 21 by insert molding, and the planetary carrier 56 is rotatable relative to the internal gear 55.

  Thereby, the rotation of the armature shaft 35 is transmitted to the speed reduction mechanism 50 via the input side two-stage gear 40 and the output side two-stage gear 51, and is decelerated by the speed reduction mechanism 50. Then, the rotational force decelerated by the reduction mechanism 50 and increased in torque is transmitted from the output shaft 39 to the male screw member 17b (see FIG. 3), and the piston 17 is moved with a large force. Therefore, an electric parking brake device can be constructed using the small electric motor 30.

  As shown in FIGS. 4 to 6, the case 21 includes a caliper fixing portion 23 that is fixed to the cylinder portion 16 d (see FIG. 3) of the caliper 16, and a motor housing portion 24 that houses the electric motor 30 (see FIG. 6). And. The caliper fixing portion 23 is provided at a portion where the output shaft 39 of the case 21 is disposed, and is disposed coaxially with the output shaft 39 and the speed reduction mechanism 50. A cylindrical fixing portion 23a is provided on the radially inner side of the caliper fixing portion 23, and the bottom side of the cylinder portion 16d is fitted and fixed. A radially outer portion of the caliper fixing portion 23 is a part of the outer case of the case 21. The outer peripheral wall part 23b which forms is provided.

  On the other hand, the motor housing portion 24 is provided at a portion of the case 21 where the electric motor 30 is disposed, and is disposed coaxially with the armature shaft 35 (see FIG. 6). The motor accommodating portion 24 includes a cylindrical main body portion 24a extending in the axial direction of the armature shaft 35, and a stepped bottom wall portion 24b on the opposite side to the cover 22 side along the axial direction of the cylindrical main body portion 24a. ing. The electric motor 30 is inserted into the motor housing 24 and is firmly fixed to the motor housing 24 by fastening means (not shown) so as not to rotate relative to the motor housing 24.

  As shown in FIG. 4, the axial length L1 of the motor accommodating portion 24 is longer than the axial length L2 of the caliper fixing portion 23 (L1> L2). Here, the axial length L1 of the motor accommodating portion 24 is a length dimension from the opening 21a (see FIG. 6) of the case 21 to the bottom wall portion 24b of the motor accommodating portion 24, and the axis of the caliper fixing portion 23 The direction length L2 is a length dimension from the opening 21a of the case 21 to the tip of the cylindrical fixing portion 23a of the caliper fixing portion 23. Further, the axial length L1 is approximately twice the axial length L2.

  Thus, when the actuator 20 is fixed to the caliper 16, the electric motor 30 can be disposed directly beside the cylinder portion 16d as shown in FIG. 2 so that the armature shaft 35 and the output shaft 39 are parallel to each other. . Therefore, it can suppress that the axial direction dimension of the cylinder part 16d increases, and it can avoid that the brake device 10 contacts a shock absorber etc. FIG.

  Here, as shown in FIGS. 5 and 6, the vehicle-side connector is electrically connected to the side opposite to the caliper fixing portion 23 that sandwiches the motor housing portion 24 along the longitudinal direction of the case 21 (left-right direction in the drawing). The connector connection part 25 connected to is integrally provided. Inside the connector connecting portion 25, power supply terminals (not shown) for supplying a driving current from the vehicle-side connector to each brush 38 are provided. As shown in FIG. 2, the connector connecting portion 25 is directed to the side opposite to the cylinder portion 16 d side in a state where the actuator 20 is fixed to the caliper 16. Thus, the vehicle-side connector can be easily and reliably connected to the connector connecting portion 25 with the brake device 10 attached to the vehicle.

  As shown in FIGS. 4 to 6, the caliper fixing part 23 includes a cylindrical fixing part 23a and an outer peripheral wall part 23b. A pair of screw insertion portions (fixing portion, flange portion) 23c is integrally provided on the outer peripheral wall portion 23b so as to partially protrude outward in the radial direction. That is, each screw insertion portion 23 c is disposed on the radially outer side of the caliper fixing portion 23. A fixing screw S (see FIGS. 1 and 2) for fixing the actuator 20 to the caliper 16 (see FIG. 2) is inserted into each screw insertion portion 23c, and each screw insertion portion 23c is fixed to the caliper 16. It is like that.

  The screw insertion portions 23c are arranged to face each other with the cylindrical fixing portion 23a as a center, and as a result, as shown in FIG. 3, the shaft center of the output shaft 39 is not displaced from the shaft center of the piston 17. The actuator 20 is fixed to the caliper 16 with an equal fixing force. In addition, each screw insertion part 23c is arrange | positioned at predetermined intervals in the transversal direction of the case 21 which cross | intersects the longitudinal direction of the case 21. FIG.

  As shown in FIG. 2 and FIG. 4, between the screw insertion portions 23c and the outer peripheral wall portion 23b, there are fixing portion reinforcing ribs 23d for increasing the fixing strength of the screw insertion portions 23c with respect to the outer peripheral wall portion 23b. It is provided integrally. Thereby, the twist and rattling with respect to the caliper 16 of the case 21 at the time of the action | operation of the actuator 20 are suppressed.

  A pair of reinforcing ribs 24 d are integrally provided on the outer side in the radial direction of the motor housing portion 24. As shown in FIG. 4, these reinforcing ribs 24 d are arranged such that the motor accommodating portion 24 having an axial length L <b> 1 inclines toward the caliper fixing portion 23 side with respect to the caliper fixing portion 23 having an axial length L <b> 2. It is provided in order to suppress (falling) or twisting. Further, since the case 21 is formed by injection molding of a resin material, the resin shrinks and sinks when cured. Each reinforcing rib 24d also suppresses inclination and distortion of the motor housing portion 24 with respect to the caliper fixing portion 23 due to the occurrence of sink marks when the case 21 is cured.

  Each reinforcing rib 24d is provided from one axial end (upper in FIG. 4) of the motor housing 24 to the other axial end (lower in FIG. 4) of the motor housing 24. Each reinforcing rib 24d has a substantially triangular cross section, and the amount of protrusion of each reinforcing rib 24d to the radially outer side of the motor housing portion 24 is from the one axial end side of the motor housing portion 24 to the other axial end side. It gradually gets bigger as you go to.

  Further, as shown in FIG. 5, each reinforcing rib 24d is arranged on the side (left side in the figure) where the caliper fixing portion 23 of the motor accommodating portion 24 is provided, and the protruding direction of each reinforcing rib 24d is the motor accommodating portion. When 24 is viewed from the axial direction, it is directed to each screw insertion portion 23 c of the caliper fixing portion 23. In this way, the reinforcing ribs 24d are disposed in the dead space DS of the case 21 by directing the protruding directions of the reinforcing ribs 24d toward the screw insertion portions 23c. Therefore, each reinforcing rib 24d can be formed relatively large to increase the rigidity of each reinforcing rib 24d itself.

  Further, by arranging the reinforcing ribs 24d in the dead space DS of the case 21, the cylinder portion is suppressed as shown in a two-dot chain line circle in FIG. 5 while suppressing the inclination toward the caliper fixing portion 23 side of the motor housing portion 24. 16d and the motor accommodating part 24 can be arranged close to each other in a range where the motor accommodating part 24 does not interfere, that is, a position avoiding the cylinder part 16d. That is, the location of each reinforcing rib 24d is an advantageous location for reducing the size and weight of the brake device 10.

  As shown in FIG. 4, the other axial end side of the motor accommodating portion 24 in each reinforcing rib 24 d is provided toward the outer peripheral wall portion 23 b of the caliper fixing portion 23. Thereby, as shown in FIG. 5, the stress F applied to each reinforcing rib 24d is released to the outer peripheral wall portion 23b through the screw insertion portion 23c (flange portion). Therefore, the inclination and the twist with respect to the caliper fixing | fixed part 23 of the motor accommodating part 24 are suppressed more reliably. Here, the thickness of the outer peripheral wall portion 23 b along the axial direction of the output shaft 39 is thick, and the rigidity of the outer peripheral wall portion 23 b along the axial direction of the output shaft 39 is high. Further, the outer peripheral wall portion 23b is connected to the screw insertion portion 23c. Therefore, deformation of the outer peripheral wall portion 23b due to the stress F applied from each reinforcing rib 24d is suppressed.

  As shown in FIGS. 4 and 5, the caliper fixing portion 23 is provided with a plurality of meat stealing portions 23 e. These meat stealing portions 23e are provided on the cylinder portion 16d side (front side in FIG. 5) of the caliper fixing portion 23 and around the cylindrical fixing portion 23a. Each meat stealing part 23e is arrange | positioned between the cylindrical fixing | fixed part 23a and the outer peripheral wall part 23b, and is arrange | positioned along with the circumferential direction of the cylindrical fixing | fixed part 23a. Each meat stealing portion 23 e is provided to prevent deformation due to sink marks of the caliper fixing portion 23 and to reduce the weight of the case 21, and is provided so as to be recessed in the axial direction of the output shaft 39.

  Each meat stealing portion 23e is partitioned from each other by a plurality of radial ribs 23f provided radially around the output shaft 39. These radial ribs 23f are provided between the cylindrical fixing portion 23a and the outer peripheral wall portion 23b, between the cylindrical fixing portion 23a and each screw insertion portion 23c, and between the cylindrical fixing portion 23a and the motor housing portion 24, respectively. ing.

  Of these radial ribs 23f, the radial ribs 23f1 between the cylindrical fixing portions 23a and the screw insertion portions 23c increase the rigidity between them to suppress the twisting and rattling of the caliper 16 of the case 21. It has a function to do. Of the radial ribs 23f, the radial ribs 23f2 between the cylindrical fixing part 23a and the motor housing part 24 have a function of suppressing inclination and distortion of the motor housing part 24 with respect to the caliper fixing part 23. .

  Here, as shown in FIG. 5, the pair of reinforcing ribs 24d is provided integrally with the outer peripheral wall portion 23b at a position that does not overlap with each meat stealing portion 23e when the motor housing portion 24 is viewed from the axial direction. It has been. As a result, the shape of the mold used when the case 21 is injection-molded can be simplified, and the stress F applied from each reinforcing rib 24d is applied to the thinned meat stealing portion 23e. Is prevented.

  As described above in detail, according to the present embodiment, the motor housing portion 24 includes the reinforcing rib 24d extending from one axial end of the motor housing portion 24 to the other axial end, and the reinforcing rib 24d is It is arranged on the side where the caliper fixing part 23 of the motor housing part 24 is located.

  Accordingly, the rigidity of the case 21 can be increased, and the caliper fixing portion 23 and the motor housing portion 24 can be prevented from being twisted with each other when the electric motor 30 is driven. Therefore, the case 21 can be further reduced in size and weight, and the generation of operating noise and the change in the backlash of the gear of the speed reduction mechanism 50 can be suppressed.

  Moreover, even if the case 21 is injection-molded with a resin material, the motor housing part 24 can be prevented from falling to the caliper fixing part 23 due to sink marks or the like. Therefore, it is possible to improve the molding accuracy of the case 21, eliminate the manufacturing problem, and improve the yield.

  Furthermore, according to the present embodiment, the screw insertion portion 23c fixed to the caliper 16 is provided on the radially outer side of the caliper fixing portion 23, and the reinforcing rib 24d is formed when the motor housing portion 24 is viewed from the axial direction. And projecting toward the screw insertion portion 23c. Therefore, the reinforcing rib 24d can be disposed in the dead space DS of the case 21, and as a result, the reinforcing rib 24d can be formed relatively large, and the rigidity of the reinforcing rib 24d itself can be increased.

  Further, according to the present embodiment, the outer peripheral wall portion 23b is provided on the radially outer side of the caliper fixing portion 23, and the reinforcing rib 24d is provided toward the outer peripheral wall portion 23b. Therefore, the stress F applied to the reinforcing rib 24d can be released to the outer peripheral wall portion 23b, and the inclination and twist of the motor housing portion 24 with respect to the caliper fixing portion 23 can be more reliably suppressed.

  Furthermore, according to the present embodiment, the caliper fixing part 23 is provided with a plurality of meat stealing parts 23e, and the reinforcing ribs 24d are overlapped with the meat stealing part 23e when the motor housing part 24 is viewed from the axial direction. It is provided at a position that does not become necessary. Accordingly, the shape of the mold used when the case 21 is injection-molded can be simplified, and the stress F applied from the reinforcing rib 24d is applied to the thinned meat stealing portion 23e. Can be prevented.

  Further, according to the present embodiment, the plurality of meat stealing portions 23e are partitioned by the radial ribs 23f provided radially around the output shaft 39. Therefore, the weight of the case 21 can be reduced and sufficient rigidity of the case 21 can be ensured.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the brake device 10 is an electric parking brake device. However, the present invention is not limited to this, and an actuator that is operated by a driver's brake pedal operation is provided. It can also be applied to connected brake devices (Brake by wire).

  Further, in the above embodiment, as shown in FIG. 5, a pair of reinforcing ribs 24d are respectively disposed in the dead space DS of the case 21, and the protruding directions of the reinforcing ribs 24d are directed to the screw insertion portions 23c, respectively. Although shown, the present invention is not limited to this. For example, if a relatively large space can be secured between the caliper fixing part 23 and the motor housing part 24, one reinforcing rib protruding from the motor housing part 24 toward the axis of the caliper fixing part 23 is provided. May be. Furthermore, the number of reinforcing ribs is arbitrary.

  Moreover, in the said embodiment, as shown in FIG. 6, although what showed the electric motor 30 as an electric motor with a brush was shown, this invention is not restricted to this, A brushless electric motor can also be employ | adopted. it can. In this case, generation of noise from the electric motor can be suppressed, and adverse effects on other in-vehicle devices can be more effectively reduced.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, 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.

DESCRIPTION OF SYMBOLS 10 Brake apparatus 11 Rotor 11a Rotor main body 11b Disk part 12 Hub bolt 13a, 13b Pad 14 Mounting bracket 14a Pin mounting part 14b Bridging part 15 Slide pin 16 Caliper 16a Caliper main body 16b Pin fixing part 16c Claw part 16d Cylinder part 16e Connection part 17 Piston 17a Feed screw mechanism 17b Male screw member 18 Bolt 20 Actuator (Brake actuator)
21 Case 21a Opening 22 Cover 23 Caliper fixing part 23a Cylindrical fixing part 23b Outer peripheral wall part 23c Screw insertion part (fixing part, flange part)
23d Reinforcement rib for fixing part 23e Meat stealing part 23f, 23f1, 23f2 Radial rib 24 Motor housing part 24a Cylindrical main body part 24b Bottom wall part 24d Reinforcement rib 25 Connector connection part 30 Electric motor 31 Motor case 32 Magnet 33 Coil 34 Armature 35 Armature Axis (rotary axis)
36 pinion gear 37 commutator 38 brush 39 output shaft 40 input side two-stage gear 41 large diameter gear 42 small diameter gear 50 reduction mechanism 51 output side two stage gear 52 large diameter gear 53 small diameter gear (sun gear)
54 Planetary gear (planetary gear)
55 internal gear 56 planet carrier 57 support pin DS dead space F stress S fixing screw

Claims (18)

A brake actuator that drives a piston that is movably held by a caliper,
An electric motor having a rotating shaft;
An output shaft that is provided side by side with the rotating shaft and transmits the power of the electric motor to the piston;
A speed reduction mechanism provided between the rotating shaft and the output shaft;
A case for housing the electric motor and the speed reduction mechanism;
A caliper fixing portion provided at a portion of the case where the output shaft is disposed and fixed to the caliper;
A motor accommodating portion that is provided in a portion of the case where the rotating shaft is disposed and accommodates the electric motor;
Have
The axial length of the motor accommodating portion is longer than the axial length of the caliper fixing portion,
The motor housing portion includes a reinforcing rib extending from one axial end of the motor housing portion to the other axial end,
The reinforcing rib is disposed on a side where the caliper fixing portion of the motor accommodating portion is present,
A connector connecting portion to which a vehicle-side connector is connected is provided on the side opposite to the reinforcing rib side of the motor housing portion along the longitudinal direction of the case,
The motor accommodating portion is disposed in the connection direction of the vehicle-side connector,
Brake actuator. The brake actuator according to claim 1, wherein
The connector connecting portion is disposed on a straight line passing through the axis of the caliper fixing portion and the axis of the motor housing portion;
Brake actuator. The brake actuator according to claim 2, wherein
The pair of reinforcing ribs are arranged so as to be symmetric about a straight line passing through the axis of the caliper fixing part and the axis of the motor housing part.
Brake actuator. The brake actuator according to any one of claims 1 to 3,
A fixing portion that is fixed to the caliper is provided outside the caliper fixing portion in the radial direction, and the reinforcing rib protrudes toward the fixing portion when the motor housing portion is viewed from the axial direction. ,
Brake actuator. In the brake actuator according to any one of claims 1 to 4,
The reinforcing rib is disposed at a position avoiding a cylinder portion constituting a part of the caliper.
Brake actuator. In the brake actuator according to any one of claims 1 to 5,
An outer peripheral wall is provided on the radially outer side of the caliper fixing part, and the reinforcing rib is provided toward the outer peripheral wall.
Brake actuator. The brake actuator according to any one of claims 1 to 6,
The caliper fixing part is provided with a plurality of meat stealing parts, and the reinforcing rib is provided at a position that does not overlap the meat stealing part when the motor housing part is viewed from the axial direction.
Brake actuator. The brake actuator according to claim 7,
The plurality of meat stealing portions are partitioned by radial ribs provided radially around the output shaft,
Brake actuator. In the brake actuator according to any one of claims 1 to 8,
The cross-section of the reinforcing rib is formed in a triangular shape,
Brake actuator. A rotor,
A pad pressed against the rotor;
A piston that presses the pad;
A caliper for movably holding the piston;
An actuator provided in the caliper and driving the piston;
A brake device comprising:
The actuator is
An electric motor having a rotating shaft;
An output shaft that is provided side by side with the rotating shaft and transmits the power of the electric motor to the piston;
A speed reduction mechanism provided between the rotating shaft and the output shaft;
A case for housing the electric motor and the speed reduction mechanism;
A caliper fixing portion provided at a portion of the case where the output shaft is disposed and fixed to the caliper;
A motor accommodating portion that is provided in a portion of the case where the rotating shaft is disposed and accommodates the electric motor;
Have
The axial length of the motor accommodating portion is longer than the axial length of the caliper fixing portion,
The motor housing portion includes a reinforcing rib extending from one axial end of the motor housing portion to the other axial end,
The reinforcing rib is disposed on a side where the caliper fixing portion of the motor accommodating portion is present,
A connector connecting portion to which a vehicle-side connector is connected is provided on the side opposite to the reinforcing rib side of the motor housing portion along the longitudinal direction of the case,
The motor accommodating portion is disposed in the connection direction of the vehicle-side connector,
Brake device. The brake device according to claim 10, wherein
The connector connecting portion is disposed on a straight line passing through the axis of the caliper fixing portion and the axis of the motor housing portion;
Brake device. The brake device according to claim 11,
The pair of reinforcing ribs are arranged so as to be symmetric about a straight line passing through the axis of the caliper fixing part and the axis of the motor housing part.
Brake device. The brake device according to any one of claims 10 to 12,
A fixing portion that is fixed to the caliper is provided outside the caliper fixing portion in the radial direction, and the reinforcing rib protrudes toward the fixing portion when the motor housing portion is viewed from the axial direction. ,
Brake device. The brake device according to any one of claims 10 to 13,
The reinforcing rib is disposed at a position avoiding a cylinder portion constituting a part of the caliper.
Brake device. In the brake device according to any one of claims 10 to 14,
An outer peripheral wall is provided on the radially outer side of the caliper fixing part, and the reinforcing rib is provided toward the outer peripheral wall.
Brake device. The brake device according to any one of claims 10 to 15,
The caliper fixing part is provided with a plurality of meat stealing parts, and the reinforcing rib is provided at a position that does not overlap the meat stealing part when the motor housing part is viewed from the axial direction.
Brake device. The brake device according to claim 16, wherein
The plurality of meat stealing portions are partitioned by radial ribs provided radially around the output shaft,
Brake device. The brake device according to any one of claims 10 to 17,
The cross-section of the reinforcing rib is formed in a triangular shape,
Brake device.

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