CN100445590C - disc brake - Google Patents

Abstract

A disc brake device, which uses a simple structure to accommodate the fixed side cam plate, the drive side cam plate, the thrust transmission plate and the cam spring in a unit, and can limit the rotation of the housing and the axial direction of the cylinder. Moving, and stopping the rotation of the fixed side cam plate, it is possible to obtain a good stroke feeling when the parking brake is operated, to reliably operate the adjuster, and to always maintain a good brake clearance between the friction pad and the disc rotor. The cylinder bore has an axial groove and a circumferential groove intersecting the axial groove. On the fixed-side cam plate, a protruding piece for detenting inserted into the groove in the axial direction protrudes, and a locking groove is formed on the outer peripheral portion of the bottom surface of the circumferential side of the protruding piece for detenting. An engaging rib engaged with the axial groove protrudes from the housing, and a locking piece fitted into the locking groove is formed on one side of the engaging rib in the circumferential direction.

Description

disc brake

technical field

The present invention relates to a disc brake device comprising: a piston hydraulically pushing the friction pads, an adjuster for automatically adjusting the gap between the friction pads and the disc rotor, and a ball slide A channel-type thrust conversion mechanism pushes the piston's parking brake via the regulator.

Background technique

As a disc brake device applied to four-wheeled vehicles, etc., there is a disc brake device with a parking brake, which includes: a hydraulic action mechanism controlled by a brake pedal and a A mechanical action mechanism for pulling operations. In this disc brake device with a parking brake, generally, a piston constituting a hydraulic operating mechanism is arranged on the front opening side of the cylinder hole provided with the brake caliper body, and an adjusting nut and an adjusting nut are arranged on the rear side of the piston. Adjust the adjuster of the bolt, and arrange the thrust conversion mechanism constituting the mechanical action mechanism on the bottom side of the cylinder hole.

As the thrust conversion mechanism, a spherical slide type is widely known in the prior art. In this spherical slide type thrust conversion mechanism, the fixed side cam plate and the driving side cam plate respectively forming the slideway grooves for housing the cam bearings are arranged facing each other, and the driving side cam plate is rotated by operating the parking brake, thereby utilizing the slideway grooves. The cam action of the cam bearing and the cam bearing makes the piston generate a thrust to move to the disc rotor side, and through the thrust, the piston is pushed to the disc rotor direction through the regulator, and the friction pad is crimped on the disc rotor to obtain the braking force . In addition, the fixed side cam plate, the driving side cam plate, the thrust transmission plate, and a cam spring biasing the thrust transmission plate toward the driving side cam plate are accommodated in a substantially cylindrical housing. And carry out unitization, and realize improving assemblability. (For example, refer to Patent Document 1)

Patent Document 1: Patent No. 2739879

In the above-mentioned spherical slide type thrust conversion mechanism, since the fixed side cam plate, the driving side cam plate, the thrust transmission plate, and the cam spring are housed in a substantially cylindrical casing to form a unit, it is necessary to limit the amount of the casing. The circumferential rotation of the cylinder and the axial movement of the cylinder. Therefore, the cam plate on the fixed side is engaged with the concave and convex bottom of the cylinder hole or the rotation is limited by engaging with the engaging pin. In addition, a mounting piece is protruded from the peripheral wall, and the mounting piece is mounted on the cylinder hole by engaging the mounting piece. Since the housing is mounted in the cylinder bore on the snap ring, it takes time and increases the number of parts in the mounting process of the fixed side cam plate or the mounting of the housing.

Contents of the invention

It is an object of the present invention to provide a disc brake device that accommodates a fixed side cam plate, a drive side cam plate, a thrust transmission plate, and a cam spring in a substantially cylindrical housing to form a unit. The structure restricts the rotation of the casing in the circumferential direction of the cylinder, the movement of the axial direction of the cylinder and the rotation of the fixed side cam plate, so that a good stroke feeling can be obtained when the parking brake is operated, and the regulator can be operated reliably, so that the friction gasket and the The brake clearance of the disc rotor is always kept good.

In order to achieve the above object, the disc brake device of the present invention includes: a piston housed in the front end opening side of the cylinder hole formed in the brake caliper body, a thrust conversion mechanism arranged at the bottom side of the cylinder hole, and a An adjustment nut between the thrust conversion mechanism and the piston and an adjuster of the adjustment bolt from which the parking brake of the piston is pushed from the thrust conversion mechanism via the adjuster. The thrust transforming mechanism includes: a fixed-side cam plate installed on the bottom wall of the cylinder hole, rotatable relative to the cylinder hole bottom wall and the fixed-side cam plate, and movably penetrated in the axial direction of the cylinder body. The camshaft of the camshaft, the driving side cam plate on the opening side of the cylinder hole of the camshaft, the slideway grooves respectively formed at the relative positions of the driving side camplate and the fixed side camplate, and the slideway grooves accommodated in the camshaft In the cam bearing, the adjuster has a thrust transmission plate on the bottom side of the cylinder bore opposite to the drive side cam plate of either the adjustment nut or the adjustment bolt, and the substantially cylindrical housing accommodates the In a disc brake device including a fixed side cam plate, the driving side cam plate, the thrust transmission plate, and a cam spring that biases the thrust transmission plate toward the corresponding driving side cam plate, the cylinder hole has The axial groove in the cylinder axial direction on the bottom side inner peripheral surface and the circumferential groove in the cylinder peripheral direction intersecting with the axial groove, the fixed side cam plate has the shaft inserted into the outer peripheral surface protrudingly The anti-rotation protruding piece to the groove and the locking groove formed on the outer peripheral surface of the bottom surface on one side of the circumferential direction of the anti-rotation protruding piece. The circumferential groove and the engaging rib engaged with the circumferential groove and the inserting and locking piece embedded in the engaging groove formed on one side of the engaging rib in the circumferential direction are accommodated in the housing. The drive side cam plate, the thrust transmission plate, and the cam spring lock the fixed side cam plate against rotation while the locking piece of the housing is locked to the bottom surface of the fixed side cam plate. After inserting the tab and the engaging rib of the shell into the axial groove of the cylinder hole, turn the shell to one side, insert the engaging rib of the shell into the circumferential groove of the cylinder hole, and insert the locking piece The locking groove fixes the housing in the cylinder hole. A plurality of the axial grooves, the anti-rotation protruding pieces, and the engaging ribs are also formed at equal intervals in the circumferential direction of the cylinder body. The locking grooves are formed at equal intervals, and the locking pieces are respectively formed at equal intervals in the circumferential direction of the cylinder on one circumferential side of each engaging rib.

According to the above-mentioned structure, the rotation of the fixed-side cam plate is stopped by inserting the anti-rotation protruding piece into the axial groove of the cylinder hole. Since the locking pieces of the housing are fitted into the locking grooves of the fixed side cam plate in a state where the rotation is stopped, and the engaging ribs are inserted into the circumferential grooves, the housing cannot rotate and is restricted from moving in the axial direction of the cylinder. is set in the cylinder bore. As a result, a good stroke feeling can be obtained during the parking brake operation with a simple structure, and the adjuster can be operated reliably, and the brake gap between the friction pad and the disc rotor can always be maintained well, and the number of parts can also be reduced. Suppressed to a small amount.

And, the driving side cam plate, the thrust transmission plate and the cam spring are accommodated in the housing, and the fixed side cam plate, the driving side cam plate, the thrust transmission plate and The cam spring is temporarily installed in the case to form a unit, and after turning the case so that the anti-rotation protrusion of the fixed side cam plate is aligned with the engaging rib of the case, insert it into the axial groove of the cylinder hole, and then turn the case, By inserting the engaging rib into the circumferential groove of the cylinder hole, and fitting the locking piece of the housing into the engaging groove of the fixed side cam plate, the unit can be easily installed in the cylinder hole, improving the assemblability.

In addition, the rotation of the fixed side cam plate is restricted by providing anti-rotation protruding pieces inserted into the axial groove, and by arranging a plurality of anti-rotation protruding pieces at equal intervals in the circumferential direction of the cylinder, it can be determined that the cam plate is formed on the fixed side. The center of the camshaft insertion hole at the center of the cam plate securely arranges the fixed side cam plate at an appropriate position. As a result, even if there is a load on the fixed side cam plate during operation, the center of the fixed side cam plate will not deviate, and the drive side cam plate provided on the camshaft can always rotate in a stable state. Good parking brake operation. And, when the unit unit that temporarily installs the fixed-side cam plate, the drive-side cam plate, the thrust transmission plate, and the cam spring in the housing is mounted on the cylinder hole, the anti-rotation protruding piece and the After the above engaging ribs are inserted into the axial grooves of the cylinder hole, turn the casing to insert the engaging ribs into the circumferential grooves of the cylinder hole. When the locking pieces of the casing are inserted into the locking grooves of the fixed cam plate, There is a load on the cam plate, and since the plurality of anti-rotation protrusions are engaged with the axial grooves, the center does not shift, and the unit unit can be easily and reliably attached.

Description of drawings

FIG. 1 is an enlarged sectional view of main parts showing a disc brake device according to an embodiment of the present invention;

Fig. 2 is the II-II sectional view of Fig. 1;

Fig. 3 is a III-III sectional view of Fig. 1;

FIG. 4 is an explanatory diagram showing a state in which the casing is rotated from the state in FIG. 2;

Fig. 5 is an explanatory diagram of a state in which the locking piece is inserted into the locking groove by rotating the housing from the state of Fig. 3;

Fig. 6 is an exploded perspective view of the same thrust conversion device, adjusting nut and casing;

Fig. 7 is a sectional front view of the same disc brake device.

Symbol Description

1: Disc brake device, 2: Brake caliper body, 2a: Action part, 3: Hydraulic actuation mechanism, 4: Mechanical actuation mechanism, 5: Disc rotor, 6: Brake caliper bracket, 7: Friction gasket, 8: Cylinder hole, 8a: Large diameter part, 8b: Small diameter part, 8e: Axial groove, 8f: Circumferential groove, 8g: Cylinder hole bottom wall, 8h: Rib receiving groove, 9: Piston , 10: Thrust conversion mechanism, 11: Regulator, 12: Fixed side cam plate, 12a: Insertion hole, 12b: Rib, 12c: Protrusion for anti-rotation, 12d: Locking groove, 13: Adjusting bolt, 13a: Small-diameter piston, 13b: Clutch plate, 14: Adjusting nut, 14a: Multiple threads, 14b: Thrust transmission plate, 14c: Receiving hole, 14d: Restricting part, 14e: Engaging protrusion, 15: Cam spring, 16: Housing , 16a: large-diameter barrel, 16b: small-diameter barrel, 16c: engaging hole, 16e: engaging rib, 16f: locking piece, 17: adjusting spring, 18: bearing bracket, 19: stop ring, 20: Bearing, 21: Camshaft, 21a: Drive side cam plate, 21b: Cylindrical part, 21c: Protruding part, 22: Slideway groove, 23: Cam bearing, 24: Thrust bearing, 25: Operating handle

Detailed ways

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 7 show an embodiment of the present invention, Fig. 1 is an enlarged sectional view of the main part of the disc brake device, Fig. 2 is a sectional view of II-II of Fig. 1 , Fig. 3 is a sectional view of III-II of Fig. 1 III sectional view, Fig. 4 is an explanatory diagram showing the state of rotating the housing from the state of Fig. 2, Fig. 5 is an explanatory diagram of the state of rotating the housing from the state of Fig. 3 to insert the locking piece into the locking groove, and Fig. 6 is a thrust conversion The disassembled perspective view of the device, the adjusting nut and the housing, Fig. 7 is a sectional front view of the disc brake device.

The disc brake device 1 is a disc brake device with a parking brake. The parking brake is provided with a hydraulic actuating mechanism 3 operated by a brake pedal not shown on The mechanical action mechanism 4 for the parking brake operated by the handle or pedal shown in the figure, the brake caliper body 2 is fixed on the side of the disc rotor 5, and the brake caliper bracket 6 is fixed on the vehicle body. A pair of slide pins (not shown) are supported so as to be movable in the axial direction of the disk.

The brake caliper body 2 has an action part 2a and a reaction part 2b disposed opposite to each other on both sides of the disc rotor 5, and a bridge part 2c connecting them across the outer side of the disc rotor 5. Between the action part 2a and the reaction part 2b Between them, a pair of friction pads 7, 7 are arranged to sandwich the disk rotor 5.

A cylinder hole 8 opening on the disk rotor side is formed in the action portion 2a. The cylinder hole 8 is formed with a large-diameter portion 8a on the front end opening side, and a small-diameter portion 8b is formed on the bottom side of the cylinder hole. On the large-diameter portion 8a, a sealing groove 8c and a protective seal are respectively circumferentially arranged on the cylinder hole opening side. Slot 8d. On the small-diameter portion 8b, three axial grooves 8e are provided at equal intervals in the circumferential direction of the cylinder axial direction, and on the bottom side of the cylinder hole, a circumferential groove 8e in the cylinder circumferential direction intersecting with each axial groove 8e is provided. Slot 8f.

On the large-diameter portion 8a of the cylinder bore 8, a bottomed cylindrical piston 9 constituting the hydraulic actuator 3 is accommodated, and on the small-diameter portion 8b, a ball-shaped slideway type piston constituting the mechanical actuator 4 is accommodated. The thrust conversion mechanism 10, and between the piston 9 and the thrust conversion mechanism 10, an adjuster 11 for automatically adjusting the braking clearance between the disc rotor 5 and the friction pad 7 is arranged. A fixed-side cam plate 12 is provided on the cylinder bore bottom wall 8g.

The adjuster 11 is composed of an adjusting bolt 13 and an adjusting nut 14 , and a small-diameter piston 13 a and a clutch plate 13 b are provided at the head of the adjusting bolt 13 . Inside the adjustment nut 14 are formed a plurality of threads 14a screwed with the adjustment bolt 13, and a thrust transmission plate 14b is provided on the end of the cylinder bore bottom side. Further, on the outer peripheral side of the adjusting nut 14, a cylindrical case 16 for accommodating the cam spring 15 and the thrust transmission plate 14b is provided.

The bottom wall 9a of the piston 9 is accommodated in the large-diameter portion 8a of the cylinder hole 8 facing the disc rotor side, and the adjusting nut 14 and the adjusting bolt 13 are arranged on the inner central axis of the piston 9 . A fitting hole 9b is provided on the inner surface of the bottom wall of the piston 9, and the small-diameter piston 13a is fitted into the fitting hole 9b via a sealing material. The part is crimped on the expanded conical surface 9c.

The adjusting spring 17 is held by a bearing bracket 18 at one end and held by a stop ring 19 provided on the outer peripheral portion of the adjusting nut 14 at the other end. The force is applied to the bottom wall 9a side.

The thrust conversion mechanism 10 includes: a camshaft 21 that is rotatable relative to the cylinder bore bottom wall 8g and the fixed side cam plate 12 and movably penetrates in the cylinder axial direction, and a cylinder bore provided on the camshaft 21. The driving side cam plate 21a at the end of the opening side, the three slideway grooves 22 respectively formed at the relative positions of the driving side cam plate 21a and the fixed side cam plate 12, and the three cams accommodated in the slideway grooves 22. bearing 23.

The drive side cam plate 21a has a cylindrical portion 21b protruding from the center of the end portion on the opening side of the cylinder hole, and two protruding portions 21c, 21c are protrudingly provided on the outer peripheral side of the cylindrical portion 21b, The thrust transmission plate 14 b is in contact with the thrust transmission plate 14 b via a thrust bearing 24 on the side of the opening of the cylinder hole.

The thrust transmission plate 14b has a receiving hole 14c for receiving the cylindrical part 21b and the protrusions 21c, 21c in the center of the bottom end of the cylinder hole, and a restricting part 14d protrudes from the inner peripheral side of the receiving hole 14c. , 14d, the limiting portions 14d, 14d abut against the protrusions 21c, 12c and limit the amount of rotation of the drive side cam plate 21a to a range where each cam bearing 23 does not fall off from the slideway groove 22. Furthermore, three engaging protrusions 14e are provided at equal intervals on the outer periphery.

The fixed-side cam plate 12 is formed in a disk shape, and an insertion hole 12a through which the camshaft 21 is inserted is provided at the center thereof, and a protrusion is provided on the bottom surface around the insertion hole 12a to be inserted into the bottom wall of the cylinder hole 8g. The rib 12b of the rib receiving groove 8h. In addition, on the outer peripheral surface of the fixed-side cam plate 12, three anti-rotation protruding pieces 12c which respectively engage with the respective axial grooves 8e of the cylinder bore 8 protrude at equal intervals in the circumferential direction. Locking grooves 12d are respectively provided at the outer peripheral portion of the bottom surface of one side of the protruding piece 12c at equal intervals in the circumferential direction from the anti-rotation protruding piece 12c.

The housing 16 integrally has a large-diameter cylindrical portion 16a formed to be slightly smaller than the diameter of the small-diameter portion 8b of the cylinder hole 8, and an inner diameter formed to be larger than the outer diameter of the thrust transmission plate 14b formed on the adjustment nut 14. The small-diameter cylindrical portion 16b of the small-diameter cylindrical portion 16b is provided with three engaging holes through which the respective engaging protrusions 14e of the thrust transmission plate 14b are movably engaged only in the axial direction. 16c. In addition, a supporting piece 16d of the cam spring 15 protrudes from the inner peripheral side of the cylinder hole opening side end portion of the small-diameter cylindrical portion 16b. Engagement ribs 16e that can be inserted into the axial grooves 8e of the cylinder hole 8 and engage with the circumferential grooves 8f are projected at equal intervals in the circumferential direction at the bottom end of the cylinder hole of the large-diameter cylindrical portion 16a. On one side of the circumferential direction of each engaging rib 16e, locking pieces 16f are respectively formed at equal intervals in the circumferential direction from the engaging rib 16e.

Assembling the disc brake device 1 of this embodiment formed in this way is to insert the cam spring 15 from the opening on the bottom side of the cylinder hole of the casing 16, one end of which abuts against the support piece 16d, and inserts the cam spring 15 into the inner circumference. Through the adjusting nut 14. The other end of the cam spring 15 is brought into contact with the end of the cylinder hole opening side of the thrust transmission plate 14 b provided on the adjustment nut 14 , and the engagement protrusion 14 e of the adjustment nut 14 is engaged with the engagement hole 16 c of the housing 16 . . Then, the cylindrical portion 21b and the protrusions 21c, 21c of the drive side cam plate 21a are accommodated in the accommodation hole 14c of the thrust transmission plate 14b, and the cylinder hole bottom side of the thrust transmission plate 14b is aligned with the cylinder hole of the drive side cam plate 21a. The opening-side end abuts via a thrust bearing 24 . The drive-side cam plate 21a is regulated to rotate more than a predetermined amount when the protrusion 21c formed on the cylindrical portion 21b abuts against the restricting portion 14d formed in the receiving hole 14c. Next, the camshaft 21 is passed through the insertion hole 12a of the fixed-side cam plate 12 to accommodate the cam bearings 23 in the slide grooves 22, and the fixed-side cam plate 12 is placed on the bottom of the cylinder hole of the drive-side cam plate 21a. On the side, the locking piece 16f of the casing 16 is bent so as to be locked to the bottom surface except the locking groove 12d of the fixed-side cam plate 12 . Thus, the fixed-side cam plate 12 is temporarily attached to the cylinder bore bottom side of the case 16, and the thrust conversion device 10, the thrust transmission plate 14b, and the cam spring 15 can be mounted in the case 16 to form a unit.

By rotating the housing 16 and the fixed-side cam plate 12 in such a mounted unit, the circumferential positions of the engaging rib 16e of the housing 16 and the anti-rotation protruding piece 12c of the fixed-side cam plate 12 are aligned, and the fixed-side cam plate 12 is aligned. The plate 12 is inserted into the cylinder hole 8 by inserting the anti-rotation protrusion 12c and the engagement rib 16e into the cylinder hole axial groove 8e toward the cylinder hole bottom wall 8g side. At this time, on the fixed side cam plate 12, since the three anti-rotation protruding pieces 12c inserted into the axial groove 8e are provided at equal intervals in the cylinder circumferential direction, the rotation of the fixed side cam plate 12 can be restricted, and the The center of the insertion hole 12 a of the camshaft 21 formed at the center of the fixed-side cam plate 12 is determined, and the insertion hole 12 a is arranged at an appropriate position. Then, the housing 16 is rotated to engage the engaging ribs 16e of the housing 16 with the circumferential grooves 8f of the cylinder hole 8, and to fit the engaging pieces 16f of the housing 16 into the locking grooves 12d of the fixed-side cam plate 12. . The single element is thus fixed in the cylinder bore 8 . When the casing 16 is rotated in this way, although there is a load on the fixed side cam plate 12, since the three anti-rotation protrusions 12c of the fixed side cam plate 12 are inserted into the axial groove 8e, the fixed side cam plate 12 does not rotate, and The center is also not shifted, and the drive-side cam plate 21a provided on the camshaft 21 can always be placed in the cylinder bore in a good state.

In addition, an adjusting bolt 13, a bearing 20, a bearing bracket 18, an adjusting spring 17, and a stop ring 19 are sequentially installed inside the piston 9, which also serves as a unit. Then, the adjusting bolt 13 is screwed on the adjusting nut 14 and the piston 9 is pressed into the cylinder hole 8 at the same time, and the operating handle 25 is installed on the protruding end of the camshaft 21 . Thus, the hydraulic operating mechanism 3 , the mechanical operating mechanism 4 and the adjuster 11 can be mounted on the caliper body 2 . And, each sealing material is installed at an appropriate stage.

In this disc brake device 1, during the braking operation by the hydraulic operating mechanism 3, the pressure of the operating fluid introduced into the cylinder hole 8 pushes the piston 9 toward the disc rotor, and the friction of the action part 2a The washer 7 pushes against one side of the disc rotor 5, and the reaction force moves the brake caliper body 2 toward the action part 2a, and the reaction part 2b pushes the friction pad 7 on the side of the reaction part 2b to the disc rotor. The other side of the rotor 5 is used for braking.

At this time, when the braking gap between the friction pad 7 and the disc rotor 5 is within a fixed range, the movement of the piston 9 only moves the amount of the backlash between the adjusting bolt 13 and the adjusting nut 14 and cannot be adjusted. If the wear of the friction pad 7 and the braking clearance of the disc rotor 5 exceed a predetermined value, the piston 9 will move to the disc rotor side by a large amount beyond the backlash. Therefore, the clutch plate 13b and the conical surface 9c of the piston 9 are leave state. In this state, the adjusting bolt 13 is taken out from the adjusting nut 14 due to the force of the adjusting spring 17, and the clutch plate 13b abuts against the conical surface 9c. In this state, if the brake operation is released, the backlash will be retreated by the piston 9 and the adjusting bolt 13, and the brake clearance between the friction pad 7 and the disc rotor 5 will be automatically adjusted within a specified range.

And, in the parking brake operation performed by the mechanical operating mechanism 4, if the handle 25 is rotated by a handle or a pedal not shown, the driving side cam plate 21a rotates together with the camshaft 21, and the driving side cam plate 21a rotates together with the cam shaft 21, and the driving side The phases of each slideway groove 22 of the cam plate 21a and each slideway groove 22 of the fixed-side cam plate 12 in a non-rotating state due to engagement of the anti-rotation protrusion 12c and the axial groove 8e are shifted, whereby each cam The bearings 23 each move toward the shallow portion of the slideway groove 22, and the drive-side cam plate 21a moves toward the disk rotor side away from the fixed-side cam plate 12. The axial movement of the driving side cam plate 21a is transmitted from the adjusting nut 14 to the piston 9 via the adjusting bolt 13, and becomes a thrust force pushing the piston 9 toward the disc rotor side, which is related to the braking force of the hydraulic actuator 3. The braking effect is performed in the same way.

In this way, when the mechanical operating mechanism 4 is used for the parking operation, the fixed-side cam plate 12 is stopped from rotating due to the insertion of the anti-rotation protruding piece 12c into the axial groove 8e of the cylinder hole 8, and the housing 16 is locked by each of them. The pieces 16f are respectively fitted into the locking grooves 12 of the fixed-side cam plate 12 in the locked rotation state to be stopped from rotating, and since the engaging ribs 16e are inserted into the circumferential grooves 8f of the cylinder hole 8, the axial movement of the cylinder is restricted. move. In addition, the thrust transmission plate 14b is locked to rotate while being able to move in the axial direction by engaging with the engaging hole 16c of the casing 16 . Thus, a good stroke feeling can be obtained when the parking brake is operated, and the adjuster 11 can be reliably operated to keep the brake clearance between the friction pad 7 and the disc rotor 5 in a good state at all times. In addition, the work of installing the housing 16 housing the fixed side cam plate 12, the thrust conversion mechanism 10, the thrust transmission plate 14b, and the cam spring 15 in the cylinder hole can be easily performed, and the installation of the disc brake device 1 can be improved. Workability. In addition, since the fixed-side cam plate 12 is engaged with the axial groove 8e by the three anti-rotation protruding pieces 12c, it does not rotate even if a load is applied during operation, and the center of the fixed-side cam plate 12 does not deviate. The drive-side cam plate 21a provided on the camshaft 21 is always rotated in a stable state, so that the parking brake operation can be performed satisfactorily.

In addition to not being limited to the above-mentioned embodiment, a thrust transmission plate is formed on the adjustment nut and the adjustment nut is accommodated in the housing, but a thrust transmission plate may be formed on the adjustment bolt and the adjustment bolt is accommodated in the housing. Alternatively, the rotation of the camshaft may be stopped by abutting an operating handle for rotating the camshaft against a protrusion provided on the outer surface of the caliper body. In addition, not limited to three axial grooves, anti-rotation protruding pieces, and engaging ribs in the above-mentioned embodiment, at least one may be provided. In order to have an insert for defining the camshaft formed on the fixed-side cam plate. For the effect of the center of the through hole, it is ideal to arrange three or more at equal intervals in the circumferential direction of the cylinder.

Claims (4)

1. A disc brake device comprising an adjuster and a parking brake, the adjuster comprising: a piston accommodated at the front end opening side of a cylinder hole formed on a brake caliper body, and a piston disposed at the bottom of the cylinder hole The thrust conversion mechanism on the side, the adjustment nut and the adjustment bolt arranged between the thrust conversion mechanism and the piston; the parking brake pushes the piston from the thrust conversion mechanism through a regulator, and it is characterized in that: the thrust The transformation mechanism includes: a fixed-side cam plate installed on the bottom wall of the cylinder hole, a camshaft that is rotatable relative to the bottom wall of the cylinder hole and the fixed-side cam plate and movably penetrates through the cylinder axial direction, a drive-side cam plate provided on the opening side of the cylinder hole of the camshaft, a slideway groove respectively formed at a position opposite to the drive-side cam plate and the fixed-side cam plate, and a cam bearing accommodated in the slideway groove, The adjuster has a thrust transmission plate at the bottom end of the cylinder bore opposite to the drive side cam plate of any one of the adjustment nut and the adjustment bolt, and the fixed side cam plate, the drive side cam plate, The thrust transmission plate and the cam spring biasing the thrust transmission plate in the direction of the drive side cam plate are accommodated in a cylindrical housing, wherein the cylinder hole has a cylinder axis on the bottom inner peripheral surface. The fixed-side cam plate has an axial groove in the axial direction and a circumferential groove in the cylinder body that intersect with the axial groove. The locking groove on the outer peripheral portion of the bottom surface on the circumferential side of the anti-rotation protruding piece, the housing has the axial groove that can be inserted and protruded from the bottom end of the cylinder hole and is engaged with the circumferential groove. An engaging rib engaged with the engaging rib, and a locking piece fitted into the locking groove formed on one side of the engaging rib in the circumferential direction, the driving side cam plate, the thrust transmission plate, and The cam spring inserts the locking piece of the casing into the bottom surface of the fixed-side cam plate, and inserts the anti-rotation protrusion of the fixed-side cam plate and the engaging rib of the casing into the cylinder hole. After the axial groove of the cylinder body, the housing is turned to one side, so that the engaging rib of the housing is inserted into the circumferential groove of the cylinder hole, and the locking piece is inserted into the locking groove, and the housing is fixed on the inside the cylinder bore. 2. The disc brake device according to claim 1, characterized in that: A plurality of the axial grooves, the anti-rotation protruding pieces, and the engaging ribs are formed at equal intervals in the circumferential direction of the cylinder body. The locking grooves are formed at intervals, and the locking pieces are respectively formed at equal intervals in the circumferential direction of the cylinder on one circumferential side of each engaging rib. 3. The disc brake device according to claim 1, characterized in that: On the inner peripheral surface of the bottom side of the cylinder hole, there are a plurality of cylinder axial grooves arranged at equal intervals in the cylinder peripheral direction, and on the outer peripheral surface of the fixed side cam plate, in the cylinder peripheral direction A plurality of anti-rotation protruding pieces inserted into the axial grooves protrude at equal intervals. 4. The disc brake device according to claim 3, characterized in that: Three or more of the axial grooves and the rotation-preventing protrusions are respectively provided.

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