JP4486029B2 - Disc brake actuator with parking operation mechanism - Google Patents

Description

  The present invention relates to a disc brake operating device having a parking operation mechanism on one end side of a caliper that slidably supports a piston incorporating an adjuster mechanism.

  2. Description of the Related Art Conventionally, as a disc brake actuator having a parking operation mechanism, a cam mechanism is driven by a rotation operation of a parking lever, and an adjustment spindle of an adjuster mechanism acts on a piston to push a brake pad to a rotor. (For example, refer to Patent Document 1). FIG. 5 (a) is a cross-sectional view of a conventional disc brake operating device provided with such a cam mechanism and a conventional parking operation mechanism having an adjusting spindle, and FIG. 5 (b) is a cross-sectional view taken along line AA of FIG. 5 (a). As shown in FIG. 5 (a), the caliper body 1 slidably houses a piston 5 driven by a brake hydraulic pressure that applies axial thrust to one brake pad 3A, and an adjuster mechanism. 7 is formed, and a housing 13 for accommodating a cam mechanism 11 including a cam body 11a and a cam rod 11b is formed on one end side away from one brake pad 3A.

  When brake fluid pressure is supplied from the master cylinder to the brake cylinder 9 while the vehicle is running, the piston 5 slides and displaces, pressing one brake pad 3A against the one braking surface 12a of the rotor 12, and the reaction force is increased. A brake force is applied to the vehicle by pressing the other brake pad 3B against the other braking surface 12b of the rotor 12 via the caliper body 1.

  On the other hand, when used as a parking brake while the vehicle is stopped, a wire or the like is pulled and the brake lever is operated, and when the cam body 11a rotates and the cam rod 11b protrudes to the left, the operating force is applied to the push rod 15. Acts and applies axial thrust to the adjusting spindle 7a. The adjuster mechanism 7 includes an adjustment spindle 7a and a clutch member 7b, and the axial thrust of the push rod 15 is transmitted from the adjustment spindle 7a to the clutch member 7b. At this time, the taper surface of the clutch member 7b comes into contact with the taper surface formed on the inner surface of the piston 5, so that the axial thrust of the push rod 15 is applied to one brake pad 3A via the piston 5 without rotating the clutch member 7b. Can be pressed against one braking surface 12 a of the rotor 12. The reaction force is transmitted to the caliper body 1 via the cam mechanism 11, and the other brake pad 3B is also pressed against the other braking surface 12b of the rotor 12 to apply a braking force as a parking brake to the vehicle.

  When the amount of wear of the brake pads 3A and 3B exceeds a specified value, when the brake fluid pressure acts on the piston 5, the adjustment spindle 7a that is prevented from rotating is engaged with the adjustment spindle 7a. The clutch member 7b rotates until the taper surface of the clutch member 7b exceeds the screw clearance due to the brake fluid pressure and the taper surface of the clutch member 7b contacts the taper surface formed on the inner surface of the piston 5. By retreating by the amount, the retreat position of the piston 5 stops in a state of being advanced from the previous position, and the wear of the brake pads 3A and 3B is compensated. In order to perform such wear adjustment, the clutch member 7b is easily rotated by the bearing 14 when receiving axial thrust by the brake fluid pressure, and the rotation of the adjusting spindle 7a is reliably prevented. ing. In particular, in order to prevent the adjustment spindle 7a from rotating, two stop holes 17 are formed in the housing 13, guide pins 19 are provided in the stop holes 17, and as shown in FIG. 5 (b). Further, the flange portion 8 of the adjustment spindle 7 a is provided with a rotation recess 8 a that fits into the guide pin 19, and the adjustment spindle 7 a is configured to be restricted from rotating by the guide pin 19.

JP 2004-138240 A (refer to FIGS. 1 and 4)

  However, in the disk brake operating device having the parking operation mechanism described in Patent Document 1, the rotation stop 17 is formed in the housing 13 in order to prevent the adjustment spindle 7a from rotating, and the guide is inserted into the hole. In addition to fitting the pin 19, it is necessary to provide a rotation recess 8 a for receiving the guide pin 19 on the adjustment spindle 7 a side, and not only the processing for restricting the rotation of the adjustment spindle 7 a extends to a plurality of places. There was a difficulty that took too much time and money.

  The present invention has been made paying attention to such problems, and without any special processing or parts to prevent the rotation of the adjusting spindle, the hole drilling process of a normal disc brake actuator is performed. An object of the present invention is to provide a disc brake actuating device having a parking operation mechanism that can be finished as a part.

In order to solve the above-mentioned problems, a disc brake actuating device provided with a parking operation mechanism according to claim 1 of the present invention is provided on one end side of a caliper that slidably supports a piston incorporating an adjuster mechanism. In the disc brake actuating device having an operation mechanism, the operation mechanism is disposed between the adjustment spindle of the adjuster mechanism, a camshaft orthogonal to the adjustment spindle and having a parking lever at one end, and between the camshaft and the adjustment spindle. A rotation-linear motion conversion portion that applies axial thrust to the adjustment spindle by rotation of the camshaft, and the rotation-linear motion conversion portion is engaged with the adjustment spindle so as not to rotate relative to the adjustment spindle; A first rolling roller that rolls between the camshaft and the first roller plug while rotating; A second roller plug engaged so as not to rotate relative to the shaft, and a second rolling roller that rotates between the camshaft and the second roller plug while rotating. Both roller plugs of the adjusting spindle A second roller plug is slidably supported in a roller plug sliding hole formed in a caliper housing portion having an axis that coincides with the central axis, and the second roller plug is disposed on the housing portion orthogonal to the roller plug sliding hole. The camshaft insertion hole formed is engaged with the processed end of the camshaft insertion hole so as not to rotate about the central axis. The processed end of the camshaft insertion hole is a cylindrical hole surface formed by partially grinding the end of the housing portion, and the surface facing the housing portion of the second roller plug is the cylindrical hole surface. And a substantially concentric cylindrical surface.

Disc brake actuator having a parking operation mechanism according to claim 2 of the present invention, there is provided a disc brake actuator having a parking operation mechanism according to claim 1, of the roller plug slide hole The diameter is larger than the diameter of the camshaft insertion hole.

According to a third aspect of the present invention, there is provided a disc brake operating device provided with the parking operation mechanism. The disc brake operating device includes the parking operation mechanism according to any one of the first and second aspects. Each of the first roller plug and the second roller plug includes a pair of sliding blade portions opposed to each other in the diameter direction, and the pair of sliding blade portions of the first roller plug and the pair of sliding blades of the second roller plug. The parts are slidably engaged with each other in a direction parallel to the central axis of the adjusting spindle.

According to a fourth aspect of the present invention, there is provided a disc brake actuating device including the parking operation mechanism according to any one of the first to third aspects. Thus, all the contact end surfaces of the adjusting spindle and the first roller plug are formed in a concavo-convex shape which cannot be rotated with respect to each other.

According to a fifth aspect of the present invention, there is provided a disc brake operating device including the parking operation mechanism according to the fourth aspect , wherein the uneven shape is cylindrical. Yes, the radius of curvature of the outer cylindrical surface is smaller than the radius of curvature of the inner cylindrical surface so that the contact portion is in contact with both ends.

A disc brake operating device provided with the parking operation mechanism according to claim 6 of the present invention is a disc brake operating device provided with the parking operation mechanism according to any one of claims 1 to 5. The first roller plug and the second roller plug have the same shape.

The disc brake actuating device provided with the parking operation mechanism according to claim 1 of the present invention uses the processing end portion formed in the camshaft insertion hole processing step to prevent rotation of the second roller plug. There is no need to newly process a recess hole for preventing the rotation of the second roller plug on the bottom surface of the roller plug sliding hole of the housing portion, and the rotation force of the adjusting spindle is received by the second roller plug to prevent its rotation. be able to. The surface of the second roller plug facing the housing portion is formed by a cylindrical surface that is substantially concentric with a cylindrical hole surface obtained by partially grinding the end of the housing portion for machining the camshaft insertion hole. Therefore, the cylindrical hole processed surface can be directly fitted to the cylindrical surface of the second roller plug and used as a detent for the second roller plug.

In the disc brake actuating device having the parking operation mechanism according to claim 2 of the present invention, since the roller plug sliding hole has a large diameter, a large sliding surface of both the roller plugs can be secured, and the sliding is stabilized. Can be achieved.

According to a third aspect of the present invention, there is provided the disc brake actuating device including the parking operation mechanism, wherein the pair of sliding blade portions of the first roller plug and the pair of sliding blade portions of the second roller plug are adjusted. Since they are slidably engaged with each other in the direction parallel to the central axis of the spindle, the rotational movement of the camshaft can be stably converted into the linear movement of the adjusting spindle and caliper along the axis of the adjusting spindle. it can. Also. Since the rotation of the second roller plug is suppressed, the rotational force of the first roller plug can be received by the second roller plug via the pair of sliding blade portions, and the rotation of the adjusting spindle is prevented.

In the disc brake actuating device having the parking operation mechanism according to claim 4 of the present invention, since all the contact end surfaces of the adjusting spindle and the first roller plug are formed in an uneven shape that cannot rotate, grinding It can be formed only by work, and complicated processing and stop parts are not required.

The disc brake operating device having the parking operation mechanism according to claim 5 of the present invention is easy to process because the concave and convex shape is cylindrical, and the contact portion is in contact at both ends, so that the coupling between the two is possible. Stabilize.

In the disc brake actuating device having the parking operation mechanism according to the sixth aspect of the present invention, the first roller plug and the second roller plug have the same shape, so that the parts can be shared.

  Examples of the present invention will be described below.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the entire main part of a disc brake operating device having a parking operation mechanism according to an embodiment of the present invention, FIG. 2 (a) is a perspective view of a second roller plug, and FIG. 2 (b) is an adjusting spindle. FIG. 3A is an assembled perspective view of the first roller plug and the second roller plug, FIG. 3B is a perspective view of the housing portion, and FIG. FIG. 4B is a cross-sectional view taken along line AA of FIG. 4A.

  As shown in FIG. 1, the disc brake actuating device of the present invention comprises a fluid actuated service brake mechanism (SM) comprising a caliper 20 and a piston assembly 22, and a parking operating mechanism (PM). The piston assembly 22 includes a piston 24 that receives fluid pressure when the service brake is applied and slides within the caliper 20, and an adjuster mechanism 26 that compensates brake pad wear and prevents over-adjustment. The caliper 20 is slidably supported with respect to the fixed support 28.

  A conventionally known reversible screw type adjuster mechanism 26 is used. This reversible screw type adjuster includes an adjustment spindle 26a having a reversible screw, an adjustment sleeve 26b screwed to the spindle 26a, a bearing 26c for supporting the rotation of the adjustment sleeve 26b, a spring 26d, and the like. If the wear of the pads 29, 29 exceeds a specified value, the adjustment sleeve 26b moves forward with respect to the adjusting spindle 26a, and the retracted position of the piston 24 moves forward when the brake is released to compensate for the wear of the brake pads 29, 29. The

  Further, when an excessive brake fluid pressure is applied to the piston 24, the adjustment spindle 26a moves forward together with the adjustment sleeve 26b against the spring force of the spring 26d, so that the adjustment sleeve 26b rotates with respect to the adjustment spindle 26a. It cannot move and over-adjustment is prevented.

  The parking operation mechanism (PM) includes a parking lever 30, a camshaft 32, and a rotation-linear motion conversion unit. The parking lever 30 is operated by a brake wire so as to be orthogonal to the central axis XX of the adjustment spindle 26a. When the camshaft 32 disposed in the position rotates, the rotation / linear motion conversion unit operates. The rotation-linear motion conversion unit includes a first roller plug 34 engaged so as not to rotate relative to the adjustment spindle 26a, and a first rolling roller that rolls between the cam shaft 32 and the first roller plug 34 while rotating. 36 and a second roller plug 40 engaged so as not to rotate relative to a housing portion 38 (sometimes referred to as the housing portion 38 of the caliper 20) provided continuously to the end of the caliper 20 opposite to the rotor. A second rolling roller 42 that rolls between the camshaft 32 and the second roller plug 40 is configured. The first rolling roller 36 and the second rolling roller 42 are arranged point-symmetrically with respect to the center of the camshaft 32.

  The outer peripheral surface of the camshaft 32 on which the first and second rolling rollers 36, 42 roll and the inner surfaces of the first and second roller plugs 34, 40 are provided on the first and second rollers when the camshaft 32 rotates. A rolling curved surface is formed to give axial thrust to the two rolling rollers 36 and 42. At this time, since the camshaft 32 is rotated in a line contact state with the first and second rolling rollers 36 and 42, the rotational frictional resistance received by the camshaft 32 is small.

  The first and second roller plugs 34 and 40 are formed of a material having a hardness higher than that of the housing portion 38, and the axial thrust from the first and second rolling rollers 36 and 42 is generated by the hard roller plugs 34 and 40. The shaft thrust can be reliably transmitted to the adjusting spindle 26 a and the housing portion 38 by suppressing deformation and wear between the rolling rollers 36 and 42 and the roller plugs 34 and 40 as much as possible. Further, even if the size of the first and second rolling rollers 36 and 42 and the shape of the rolling curved surface of the rotation-linear motion converting portion are changed, only the first and second roller plugs 34 and 40 are replaced. Yes.

  Next, the structure of the first and second roller plugs 34 and 40 will be described in detail with reference to FIG. As shown in FIG. 2A, the second roller plug 40 is composed of a main body 40a and a pair of rectangular sliding blade portions 41A and 41B opposed to each other in the diameter direction. The cylindrical surface 41 a is formed so as to be inscribed in the cylindrical hole surface 38 b of the roller plug sliding hole Q formed in the housing portion 38.

  The side of the main body 40a facing the housing portion 38 is also formed with a convex cylindrical surface 40b, which is substantially the same or slightly larger than the concave cylindrical surface 38a formed when the camshaft insertion hole P drilled in the housing portion 38 is drilled. Abutting in a cylindrical shape with a radius of curvature. Therefore, the second roller plug 40 cannot rotate around the central axis XX of the adjusting spindle 26a with respect to the housing portion 38, and the radius of curvature of the cylindrical surface 40b of the main body 40a is set on the housing portion 38 side. By making it slightly larger than the radius of curvature of the cylindrical hole surface 38a, the contact portion becomes line contact at both ends, and the coupling between the two becomes stable.

On the other hand, the first roller plug 34 has the same shape as the second roller plug 40. As shown in FIG. 2B, the first roller plug 34 includes a main body 34a and a pair of sliding blade portions 35A and 35B. The cylindrical surface 35a of one sliding blade portion 35A is formed so as to be inscribed in the cylindrical hole surface 38b of the roller plug sliding hole Q formed in the housing portion 38.

  A convex cylindrical surface 34b is also formed on the side facing the adjustment spindle 26a of the main body 34a, and a concave shape formed on the first roller plug 34 side of the head 27b opposite to the reversible screw portion 27a of the adjustment spindle 26a. It is in contact with the cylindrical surface 27c in a cylindrical shape having a radius of curvature that is substantially the same as or slightly larger. Therefore, the adjusting spindle 26a and the first roller plug 34 cannot rotate relative to each other around the central axis XX of the adjusting spindle 26a, and the radius of curvature of the cylindrical surface 34b of the main body 34a is changed to the cylinder on the adjusting spindle 26a side. By making it slightly larger than the radius of curvature of the surface 27c, the contact portion becomes line contact at both ends, and the coupling between the two is stabilized. The parts can be shared by making the first roller plug 34 and the second roller plug 40 have the same shape.

As shown in FIG. 1, the first and second roller plugs 34 and 40 are assembled by sliding blade portions 35A and 35B of the first roller plug 34 and sliding blade portions 41A and 41B of the second roller plug 40. Are alternately fitted, and the camshaft 32 slides on the inner surface of the sliding blade portion 35B on the inner side of the first roller plug 34 and the inner surface of the sliding blade portion 41B on the inner side of the second roller plug 40. Abutting support is possible. The sliding blade portion 35B and the sliding blade portion 41A, and the sliding blade portion 35A and the sliding blade portion 41B are slidably fitted to each other in the direction of the central axis XX of the adjustment spindle 26a.
In addition, although sliding blade part 35A and 41B and 35B and 41A are fitted by planes, they may be fitted by curved surfaces. This fitting is for smooth sliding of the first and second roller plugs 34, 40 in the axial direction, and the first and second roller plugs 34, 40 are cams. This is done via the shaft 32.

  As described above, the second roller plug 40 is prevented from rotating about the central axis XX with respect to the housing portion 38, and the first roller plug 34 is rotated via the second roller plug 40 and the camshaft 32. The adjustment spindle 26a is prevented from rotating around its central axis X-X because it is impossiblely fitted and is engaged so as not to rotate relative to the adjustment spindle 26a.

  Further, since the camshaft 32 is accommodated in the first roller plug 34 and the second roller plug 40 via the first and second rolling rollers 36 and 42, the camshaft 32 and the center axis XX of the adjusting spindle 26a Only rotation around the central axis YY (see FIG. 3B) of the orthogonal cam shaft 32 and movement of the adjustment spindle 26a in the direction of the central axis XX are allowed, and the movement is restricted. Yes.

  Next, a procedure for assembling each component of the parking operation mechanism will be described with reference to FIGS.

  FIG. 3A is an exploded perspective view of the parking operation mechanism including the adjustment spindle 26a, the camshaft 32, the housing portion 38, and the rotation-linear motion conversion portion before the assembly. First, the second roller plug 40 is attached. Inserted from the opening side of the roller plug sliding hole Q formed in the housing portion 38 with the cylindrical surface 40b side as the head, is brought into contact with the cylindrical hole surface 38a at the bottom of the housing portion 38. As shown in FIG. 3B, the cylindrical hole surface 38a of the housing portion 38 is a processed surface formed when the camshaft insertion hole P is drilled, and is hatched with a diagonal line to distinguish it from other surfaces. . Further, the cylindrical hole surface 38b formed when the roller plug sliding hole Q is drilled is indicated by dots. When the second roller plug 40 comes into contact with the cylindrical hole surface 38a, the cylindrical surface 41a of the sliding wing 41A of the second roller plug 40 is in sliding contact with the cylindrical hole surface 38b.

The axis of the roller plug sliding hole Q coincides with the center axis XX of the adjusting spindle 26a, and the axis YY of the camshaft insertion hole P is orthogonal to the center axis XX. When the camshaft insertion hole P is formed, the end portion (bottom portion) of the housing portion is processed so as to be partially ground. Therefore, as shown in FIG. A flat surface 38c is formed. When the second roller plug 40 is brought into contact with the cylindrical hole surface 38a, the flat surface 38c serves as a pedestal function as a drop-off prevention during temporary assembly. Further, the flat surface 38c, together with the cylindrical hole surface 38a, also functions to prevent the second roller plug 40 from rotating. The diameters of the camshaft insertion hole P and the roller plug sliding hole Q may be the same or larger, but either one may be larger. A large sliding surface of the roller plugs 34, 40 can be secured, and the sliding can be stabilized.
Note that the camshaft insertion hole P in the housing portion has a size such that the camshaft 32 can move in the direction of the central axis XX.

Returning to FIG. 3A, the second roller plug 40 is brought into contact with the cylindrical hole surface 38 a, and then the camshaft 32 assembled with the first and second rolling rollers 36 and 42 is replaced with the camshaft of the housing portion 38. Insert from the opening side of the insertion hole P. Thereafter, this time, the first roller plug 34, the adjusting spindle 26a, the holder 48 (see FIG. 4A), and the spring 26d are sequentially inserted from the opening side of the roller plug sliding hole Q to include the rotation-linear motion converting portion. Assemble the cam mechanism.

  As can be seen from the assembly diagram of the cam mechanism of the parking operation mechanism shown in FIG. 4A (see FIGS. 2B and 3A), the concave shape formed on the end surface of the head 27b of the adjustment spindle 26a. The cylindrical surface 27 c is brought into contact with the cylindrical surface 34 b of the first roller plug 34, and the retaining clip 46 is locked in the ring groove 38 d of the housing portion 38, so that the spring 26 d is formed in a concave shape of the adjusting spindle 26 a via the holder 48. The cylindrical surface 27c presses the cylindrical surface 34b of the first roller plug 34 to the right, and the camshaft 32 is connected to the first and second roller plugs 34, 40 via the first and second rolling rollers 36, 42. It will be sandwiched between them. As a result, the rotation / linear motion conversion portion is accommodated in the housing portion 38, the adjustment spindle 26a is movable in the direction of the central axis XX, and the camshaft 32 is supported so as to be rotatable about the axis YY. Is done.

  At this time, as shown in FIG. 4B, the cylindrical surface 35a of the sliding blade portion 35A of the first roller plug 34 and the cylindrical surface 41a of the sliding blade portion 41A of the second roller plug 40 are roller plug sliding holes. The cylindrical hole surface 38b of Q is accommodated in a slidable state. As shown in FIG. 4A, a parking lever 30 for rotating the camshaft 32 about the axis Y-Y axis that is the axial center direction of the camshaft 32 is fitted to one end of the camshaft 32. ing. The parking lever 30 is restrained from moving in the Y-Y-axis direction by a nut 50 screwed into the tip end portion 32 a of the camshaft 32. Further, the dust boot 52 disposed between the camshaft 32 and the opening side of the camshaft insertion hole P is held by a boot holder 54 engaged with the opening of the camshaft insertion hole P, so that rotation / linear motion conversion is performed from the outside. This prevents dust and moisture from entering the unit.

  A torsion coil spring 56 is crowned on the outer peripheral surface of the nut 50, and one end of the nut 50 engages with the housing portion 38 and the other end engages with the parking lever 30. This torsion coil spring 56 always acts to return the camshaft 32 to the initial position after the parking lever 30 is operated.

  Next, the operation of the rotation / linear motion conversion unit will be described. The camshaft 32 is moved leftward in FIG. 1 by the parking lever 30 from the initial position where the first and second rolling rollers 36 and 42 are respectively sandwiched between the camshaft 32 and the first and second roller plugs 34 and 40. When rotating, the first rolling roller 36 revolves to a required position while rotating between the rolling curved surface of the camshaft 32 and the rolling curved surface of the first roller plug 34. Similarly, the second rolling roller 42 revolves to a required position while rotating between the rolling curved surface of the camshaft 32 and the rolling curved surface of the second roller plug 40.

  When the first and second rolling rollers 36 and 42 move to a required position corresponding to the amount of rotation of the camshaft 32, the first roller plug 34 moves to the left and gives axial thrust to the adjustment spindle 26a. At the same time, the second roller plug 40 moves to the right and gives an axial thrust to the housing portion 38.

  When the parking brake is operated, by pulling a brake wire (not shown) connected to one end of the parking lever 30, the camshaft 32 rotates about the Y-Y axis, and the first rolling An axial thrust in the XX axis direction is applied to the adjustment spindle 26a via the roller 36 and the first roller plug 34, and at the same time, the X-axis is applied to the housing portion 38 via the second rolling roller 42 and the second roller plug 40. An axial thrust in the X-axis direction can be applied. The axial thrust applied to the adjusting spindle 26a is transmitted to one brake pad 29 via the adjusting sleeve 26b and the piston 24, and the axial thrust applied to the housing portion 38 is slidably supported by the fixed support 28. By moving the caliper 1 to the right in FIG. 1, it is transmitted to the other brake pad 29, and a braking force can be applied to the rotor.

As described above, the embodiments of the present invention have been described with reference to the drawings, but the specific configuration is not limited to these embodiments. For example, in the present embodiment, the description has been given of the example adapted to the floating caliper type disc brake. It can also be applied to fixed caliper disc brakes.
Moreover, although the 1st roller plug 34 and the 2nd roller plug 40 were demonstrated as the same shape, it is good also as a thing of another shape.
Furthermore, in order to make the relative rotation of the adjusting spindle 26a and the first roller plug 34 impossible, the entire contact end surfaces of both are made concave and convex cylindrical surfaces. However, any contact shape may be used as long as the structure does not allow relative rotation.
Furthermore, the caliper 20 and the housing part 38 may be separate or integrated.

1 is a cross-sectional view of the entire main part of a disc brake actuator equipped with a parking operation mechanism according to an embodiment of the present invention. FIG. 2A is a perspective view of a second roller plug, and FIG. 2B is a perspective view of an adjustment spindle and a first roller plug. FIG. 3A is an assembled perspective view of the first roller plug and the second roller plug, and FIG. 3B is a perspective view of the housing portion. (A) is an assembly sectional view of the rotation-linear motion conversion part in the parking operation mechanism, and FIG. 4 (b) is an AA sectional view of FIG. 4 (a). FIG. 5A is a cross-sectional view of a conventional disc brake operating device including a parking mechanism having a cam mechanism and an adjusting spindle, and FIG. 5B is a cross-sectional view taken along line AA of FIG.

DESCRIPTION OF SYMBOLS 20 Caliper 22 Piston assembly 24 Piston 26 Adjuster mechanism 26a Adjustment spindle 26b Adjustment sleeve 26c Bearing 26d Spring 27a Reversible screw part of adjustment spindle 27b Head part of adjustment spindle 27c Concave cylindrical surface 28 Fixed support 29 Brake pad 30 Parking lever 32 Cam Shaft 32a End portion of camshaft 34 First roller plug 34a Main body 34b Convex cylindrical surface 35A, 35B Sliding blade 35a Cylindrical surface 36 First rolling roller 38 Housing portion (housing portion of caliper)
38a Concave cylindrical surface (cylindrical hole surface)
38b Concave cylindrical surface (cylindrical hole surface)
38c Flat surface 38d Ring groove 40 Second roller plug 40a Main body 40b Convex cylindrical surface 41A, 41B Sliding blade 41a Cylindrical surface 42 Second rolling roller 46 Stop clip 48 Holder 50 Nut 52 Dust boot 54 Boot holder 60 Torsion coil spring P Camshaft insertion hole Q Roller plug sliding hole (PM) Parking operation mechanism (SM) Service brake mechanism

Claims (6)

In a disc brake operating device having a parking operating mechanism on one end side of a caliper that slidably supports a piston having a built-in adjuster mechanism, the operating mechanism includes an adjusting spindle of the adjuster mechanism, and an orthogonal to the adjusting spindle. The rotation-linear motion is composed of a camshaft having a parking lever at one end, and a rotation-linear motion conversion portion that is disposed between the camshaft and the adjustment spindle and applies axial thrust to the adjustment spindle by the rotation of the camshaft. The conversion unit has a first roller plug engaged so as not to rotate relative to the adjusting spindle, a first rolling roller that rolls between the camshaft and the first roller plug while rotating, and a first roller plug. The second roller plug engaged so as not to rotate, and rotating between the camshaft and the second roller plug while rotating. And both roller plugs are slidably supported in roller plug sliding holes formed in a caliper housing portion having an axis that coincides with the center axis of the adjusting spindle. The second roller plug is non-rotatably engaged around the central axis with respect to a machining end portion of a cam shaft insertion hole formed in the housing portion orthogonal to the roller plug sliding hole, and the cam shaft insertion The processed end portion of the hole is a cylindrical hole surface formed by partially grinding the end portion of the housing portion, and the surface facing the housing portion of the second roller plug is substantially concentric with the cylindrical hole surface. A disc brake actuating device having a parking operation mechanism formed of a cylindrical surface . The disk brake operating device provided with the parking operation mechanism according to claim 1, wherein a diameter of the roller plug sliding hole is larger than a diameter of the camshaft insertion hole. Each of the first roller plug and the second roller plug includes a pair of sliding blade portions opposed to each other in the diameter direction, and a pair of sliding blade portions of the first roller plug and a pair of sliding blade portions of the second roller plug; The disc brake operating device provided with the operating mechanism for parking according to any one of claims 1 and 2, which are slidably engaged with each other in a direction parallel to a central axis of the adjusting spindle. The disc brake provided with the parking operation mechanism according to any one of claims 1 to 3, wherein all the contact end surfaces of the adjustment spindle and the first roller plug are formed in a concavo-convex shape incapable of rotating with each other. Actuator. The disc having the parking operation mechanism according to claim 4 , wherein the concave and convex shape is a cylindrical shape, and the radius of curvature of the outer cylindrical surface is smaller than the radius of curvature of the inner cylindrical surface so that the contact portion is in contact at both ends. Brake actuator. The disc brake actuating device having a parking operation mechanism according to any one of claims 1 to 5, wherein the first roller plug and the second roller plug have the same shape.

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