JP2006002867A - Disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake device having a simple structure, improving versatility and assembling workability, and capable of reducing cost.
An engaging projection 11b is provided on the outer periphery of a fixed cam plate 11. An engagement receiving portion 12 c that engages with the engagement protrusion 11 b is provided at the cylinder hole bottom side end portion of the housing 12. The engagement receiving portion 12c is formed in a direction that opens to the edge on the cylinder hole bottom side after being bent in the circumferential direction from the cylinder hole opening side of the engagement groove 12g and the engagement groove 12g formed of a cylinder axial slit. Guide groove portion 12h. The fixed cam plate 11 is attached to the cylinder hole bottom side end of the housing 12 by the engagement protrusion 11b being pressed against the cylinder hole bottom side of the engagement groove 12g by the urging force of the cam spring 23.
[Selection] Figure 1

Description

  The present invention relates to a disc brake device, and more specifically, a piston that presses a friction pad by hydraulic pressure, an adjuster for automatically adjusting a gap between the friction pad and the disc rotor, and a ball ramp type thrust conversion mechanism. The present invention relates to a disc brake device provided with a parking brake that presses a piston via a cylinder.

  As a disc brake device used for a four-wheeled vehicle or the like, there is a disc brake device with a parking brake including a hydraulic actuation mechanism using a brake pedal and a mechanical actuation mechanism that is pulled by a handle lever or a foot pedal. In this disc brake device with a parking brake, generally, a piston that constitutes a hydraulic operating mechanism is disposed on the end opening side of a cylinder hole provided in a caliper body, and an adjuster having an adjusting nut and an adjusting bolt on the rear surface side of the piston. And a thrust conversion mechanism constituting a mechanical operating mechanism is disposed on the bottom side of the cylinder hole.

  Conventionally, a ball lamp type has been widely known as a thrust conversion mechanism. In this ball ramp type thrust conversion mechanism, a drive cam plate and a fixed cam plate each having a ramp groove for accommodating a ball (cam bearing) are arranged opposite to each other, and the drive cam plate is rotated by a parking brake operation. As a result, a thrust force that moves the piston toward the disk rotor side is generated between the ramp groove and the fixed cam plate that is in a non-rotating state by the cam action of the cam bearing, and the thrust transmission plate and adjuster are caused by this thrust force. Thus, the piston is pushed in the direction of the disk rotor, and the friction pad is pressed against the disk rotor to obtain a braking force.

The thrust conversion mechanism, an adjuster provided with a thrust transmission plate, and a cam spring that presses the thrust transmission plate in the direction of the thrust conversion mechanism are housed in a substantially cylindrical housing. The housing has a mounting piece projecting from the end thereof, and is mounted in the cylinder hole by bringing a retaining ring having elasticity in the radial direction mounted in the cylinder hole into contact with the mounting piece ( For example, see Patent Documents 1 and 2.)
Japanese Patent No. 3121836 Japanese National Patent Publication No. 3-503202

  In the ball ramp type thrust converting mechanism, since many components are used for the thrust converting mechanism and the adjuster, it takes time and effort to assemble the disc brake device and requires skill in the work. Further, the drive side cam plate needs to be held in a state where it can be rotated only within a predetermined angle range. However, in the thrust conversion mechanism as described above, the drive side cam plate is connected to the outer end side of the camshaft. Since the amount of rotation is regulated by bringing the operating lever into contact with the pin or bolt provided on the caliper body, the position of the pin or bolt must be changed according to the handling of the caliper body to the vehicle body.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a disc brake device that has a simple structure, improves versatility and assembly workability, and can reduce costs.

  In order to achieve the above object, the first invention provides a piston housed on the tip opening side of the cylinder hole, a thrust conversion mechanism disposed on the bottom side of the cylinder hole, and a gap between the thrust conversion mechanism and the piston. A disc brake device including a parking brake that pushes the piston from the thrust conversion mechanism via the adjuster, the adjustment mechanism having the adjustment nut and the adjustment bolt provided on the thrust conversion mechanism. A fixed cam plate attached to the bottom wall of the hole, a cam shaft penetrating the cylinder hole bottom wall and the fixed cam plate so as to be rotatable and movable in the cylinder axial direction, and a cylinder hole opening side of the cam shaft A driving cam plate provided at an end, a ramp groove formed at a position facing the driving cam plate and the fixed cam plate, and the lamp; The adjuster includes a thrust transmission plate at a cylinder hole bottom side end facing the drive cam plate of either one of an adjustment nut and an adjustment bolt, and the thrust transmission plate In the disc brake device in which the driving cam plate and the cam spring that urges the thrust transmission plate in the direction of the driving cam plate are accommodated in a substantially cylindrical housing mounted in the cylinder hole. An engagement protrusion is provided on the outer periphery of the fixed cam plate, and an engagement receiving portion for engaging the engagement protrusion is provided at a cylinder hole bottom side end of the housing. An engagement groove formed of an axial slit, and a guide groove formed in a direction that opens from the cylinder hole opening side of the engagement groove to the end on the cylinder hole bottom side after being bent in the circumferential direction. The fixed cam plate is attached to the cylinder hole bottom side end portion of the housing by the engagement protrusion being pressed to the cylinder hole bottom side of the engagement groove by the biasing force of the cam spring. .

  According to a second aspect of the present invention, the groove width in the circumferential direction of the housing is such that the groove width in the circumferential direction of the housing prevents the housing and the fixed cam plate from rotating when the engagement protrusion is engaged. The fixed-side cam plate is formed to have a longer dimension than the play dimension in the cylinder axial direction.

  According to a third aspect of the present invention, the housing is provided with an engaging portion that engages with the thrust transmission plate at an intermediate portion in the cylinder axial direction to prevent the thrust transmission plate from rotating, and the thrust transmission plate and the drive side cam plate Between the two, there is provided a regulating means for regulating the amount of rotation of the driving cam plate within a range in which the cam bearing does not fall out of the ramp groove.

  According to the first aspect of the present invention, the fixed cam plate, the thrust conversion mechanism, the adjusting nut provided with the thrust transmitting plate, the adjusting bolt, and the cam spring are accommodated in the housing, and the guide is formed in the housing. By inserting the engaging protrusion formed on the fixed cam plate into the groove, and rotating the housing or the fixed cam plate to accommodate the engaging protrusion in the engaging groove, the fixed cam plate, the thrust conversion mechanism, In addition, any one of the adjusting nut and the adjusting bolt provided with the thrust transmission plate and the cam spring can be unitized, and the assembling workability can be improved. In addition, the engagement protrusion accommodated in the engagement groove can be prevented from coming off from the engagement groove by being pressed by the cam spring toward the bottom of the cylinder hole of the engagement groove.

  According to the second invention, the housing and the fixed cam plate are prevented from rotating, and the engagement protrusion can be reliably prevented from coming off from the engagement groove, and the fixed cam plate is not detached from the housing.

  According to the third aspect of the invention, the amount of rotation of the drive side cam plate can be regulated with a simple structure, which is excellent in versatility and can be reduced in cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is an enlarged sectional view of a main part of a disc brake device, FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 4 is an exploded perspective view of FIG. 3 and FIG. 5 is a cross-sectional front view of the disc brake device.

  The disc brake device 1 includes a caliper body 2, a hydraulic operation mechanism 3 that is operated by a brake pedal (not shown), and a mechanical operation mechanism 4 for a parking brake that is operated by a hand lever and a foot pedal (not shown). The caliper body 2 is connected to a caliper bracket 6 fixed to the vehicle body on one side of the disc rotor 5 via a pair of sliding pins (not shown). It is supported to be movable in the direction.

  The caliper body 2 includes an action part 2a and a reaction part 2b that are arranged to face both sides of the disk rotor 5, and a bridge part 2c that straddles the outside of the disk rotor 5 and connects them. A pair of friction pads 7 are disposed between the disk rotor 5 and the reaction portion 2b.

  A cylinder hole 2d that opens to the disk rotor side is formed in the action portion 2a. A bottomed cylindrical piston 8 constituting the hydraulic operating mechanism 3 is accommodated on the tip opening side of the cylinder hole 2d, and a ball lamp type constituting the mechanical operating mechanism 4 is provided on the bottom side of the cylinder hole 2d. The thrust conversion mechanism 9 is housed, and an adjuster 10 is provided between the piston 8 and the thrust conversion mechanism 9 to keep the braking gap between the disk rotor 5 and the friction pad 7 constant at all times. Yes. A fixed cam plate 11, a thrust conversion mechanism 9, and an adjuster 10 are disposed in a cylindrical housing 12 at the bottom of the cylinder hole 2 d.

  The adjuster 10 includes an adjusting bolt 13 and an adjusting nut 14, and a small-diameter piston 13 a and a clutch plate 13 b are provided on the head of the adjusting bolt 13. The adjusting nut 14 is internally formed with a multi-threaded screw 14a that is screwed with the adjusting bolt 13, and is provided with a thrust transmission plate 14b at the end on the cylinder hole bottom side. Engaging protrusions 14c are provided at equal intervals.

  The piston 8 is accommodated in the cylinder hole 2d with the bottom wall 8a facing the disk rotor, and the adjusting nut 14 and the adjusting bolt 13 are provided on the inner central axis of the piston 8. A fitting hole 8b is provided on the inner surface of the bottom wall of the piston 8. The small-diameter piston 13a is fitted into the fitting hole 8b via a sealing material, and the clutch plate 13b is an opening of the fitting hole 8b. Is pressed against the conical surface 8c that expands by the action of the adjusting spring 15. The adjustment spring 15 is held at one end by the bearing receiver 16 and at the other end by a retaining ring 17 provided on the outer peripheral portion of the adjustment nut 14, and the adjustment bolt 13 is connected to the bottom wall 8 a via the bearing receiver 16 and the bearing 18. It is energized in a state that it can pivot to the side.

  The thrust conversion mechanism 9 includes a camshaft 19 that passes through the cylinder hole bottom wall 2e and the fixed cam plate 11 so as to be rotatable and movable in the cylinder axial direction, and a cylinder hole opening side end of the camshaft 19 The drive side cam plate 19a provided in the section, and the three ramp grooves 20 formed at the opposing positions of the cylinder hole bottom side end surface of the drive side cam plate 19a and the cylinder hole opening side end surface of the fixed side cam plate 11 respectively. And three cam bearings 21 accommodated in the ramp groove 20. The thrust transmission plate 14b is in contact with the cylinder hole opening side surface of the driving cam plate 19a via a thrust bearing 22. A cylindrical portion 19b protrudes from the center of the cylinder hole opening side end of the drive side cam plate 19a, and two protruding portions 19c and 19c protrude from the outer peripheral side of the cylindrical portion 19b. .

  The thrust transmission plate 14b is formed with an accommodation hole 14d for accommodating the cylindrical portion 19b and the projections 19c, 19c at the center of the cylinder hole bottom side end portion, and on the inner peripheral side of the accommodation hole 14d, the projection Restriction pieces 14e and 14e are provided protruding so as to abut against the portions 19c and 19c and restrict the amount of rotation of the drive side cam plate 19a within a range in which each cam bearing 21 does not fall off the ramp groove 20.

  The fixed-side cam plate 11 is provided with two protrusions 11a on the cylinder hole bottom side end face that engage with an engagement hole 2f formed in the cylinder hole bottom wall 2e to prevent the fixed-side cam plate 11 from rotating. Three engaging projections 11b that engage with the housing 12 protrude from the outer periphery, and an insertion hole 11c of the camshaft 19 is formed at the center.

  The housing 12 is integrally provided with a large-diameter cylindrical portion 12a formed to be slightly smaller than the diameter on the bottom side of the cylinder hole 2d and a small-diameter cylindrical portion 12b formed to have an inner diameter larger than the outer diameter of the thrust transmission plate 14b. Thus, on the cylinder hole bottom side of the large diameter cylindrical portion 12a, there are three engagement receiving portions 12c that respectively engage with the engagement protrusions 11b of the fixed cam plate 11, and the small diameter cylindrical portion 12b side. Are formed with three attachment pieces 12d each having a part of the peripheral wall cut and raised outward. Three engagement holes 12e with which the engagement protrusions 14c are engaged are formed on the cylinder hole bottom side of the small diameter cylindrical portion 12b, and a support piece 12f of the cam spring 23 is formed on the cylinder hole opening side end. Projected on the circumferential side.

  The engagement receiving portion 12c is an engagement groove portion 12g formed of a slit in the cylinder axial direction, and a direction in which the engagement receiving portion 12c is bent in the circumferential direction from the cylinder hole opening side of the engagement groove portion 12g and then opened to the edge on the cylinder hole bottom side. L-shaped guide groove portion 12h formed on the housing 12 and the engagement groove portion 12g, when the engagement protrusion 11b engages with the groove width in the housing circumferential direction, the housing 12 and the fixed cam plate 11 The length in the cylinder axis direction is longer than the play dimension in the cylinder axis direction of the fixed cam plate 11.

  The disc brake device 1 formed in this way is assembled by inserting the cam spring 23 through the opening on the bottom side of the cylinder hole of the housing 12, bringing one end of the cam spring 23 into contact with the support piece 12 f, and adjusting the inner periphery of the cam spring 23. Insert the nut 14. The other end of the cam spring 23 is brought into contact with the cylinder hole opening side end of the thrust transmission plate 14b provided in the adjustment nut 14, and the engaging protrusion 14c is engaged with the engaging hole 12e of the housing 12, The thrust transmission plate 14b is prevented from rotating. Next, the cylindrical portion 19b of the driving cam plate 19a and the projections 19c, 19c are accommodated in the receiving hole 14d formed in the thrust transmission plate 14b, and the cylinder hole bottom side end portion of the thrust transmission plate 14b and the driving cam A cylinder hole opening side end portion of the plate 19 a is brought into contact with the thrust bearing 22. Next, the camshaft 19 is passed through the insertion hole 11 c so that the three cam bearings 21 are accommodated in the respective cam grooves 20, and the driving cam plate 19 a is disposed on the cylinder hole opening side of the fixed cam plate 11. The engaging protrusion 11b of the fixed cam plate 11 is inserted into the guide groove 12h of the housing 12, and the engaging protrusion 11b is pushed into the guide groove 12h against the elastic force of the cam spring 23, and the housing 12 or fixed The side cam plate 11 is rotated to introduce the engagement protrusion 11b into the cylinder hole opening side of the engagement groove 12g. The engaging protrusion 11b introduced into the engaging groove 12g is moved by the elastic force of the cam spring 23 via the thrust transmission plate 14b, the thrust bearing 22, the driving cam plate 19a, and the cam bearing 21. To the bottom of the cylinder hole. As a result, the fixed cam plate 11 is attached to the bottom of the cylinder hole of the housing 12, and the thrust conversion mechanism 9 and the adjustment nut 14 are unitized. Further, the drive side cam plate 19a rotates more than a predetermined amount by the restriction piece 14e formed in the accommodation hole 14d coming into contact with the projection 19c formed in the cylindrical portion 19b of the drive side cam plate 19a. Is regulated.

  The unit of the thrust conversion mechanism 9 and the adjusting nut 14 assembled as described above is inserted into the cylinder hole 2d with the fixed cam plate 11 facing the cylinder hole bottom wall 2e, and protrudes from the fixed cam plate 11. The camshaft 19 is projected outside from the camshaft insertion hole 2g of the cylinder hole bottom wall 2e, and each protrusion 11a of the fixed cam plate 11 is engaged with the engagement hole 2f formed in the bottom wall 2e of the cylinder hole 2d. At the same time, the C ring 24 is attached to the cylinder hole opening side of the three mounting pieces 12 d provided in the housing 12. At this time, after the fixed cam plate 11 is brought into contact with the bottom wall 2e, the C ring 24 is attached in a state where the housing 12 is slightly pushed toward the bottom wall 2e against the elastic force of the cam spring 23. As a result, the thrust conversion mechanism 9 is urged toward the bottom wall 2 e by the elastic force of the cam spring 23, and the housing 12 is urged toward the cylinder hole opening by the reaction force. Therefore, the unit including the housing 12 can be assembled to the bottom side of the cylinder hole 2d by restricting the movement of the housing 12 to the cylinder hole opening side while suppressing the rattling of the housing 12.

  On the other hand, inside the piston 8, an adjusting bolt 13, a bearing 18, a bearing receiver 16, an adjusting spring 15, and a retaining ring 17 are mounted in this order, which is also a unit. Next, the piston 8 is pushed into the cylinder hole 2 d while the adjustment bolt 13 is screwed into the adjustment nut 14, and the operation lever 25 is attached to the protruding end of the camshaft 19. As a result, the hydraulic operating mechanism 3, the mechanical operating mechanism 4, and the adjuster 10 are assembled to the caliper body 2. Each sealing material is attached at an appropriate stage.

  In this disc brake device 1, in the brake operation using the hydraulic operation mechanism 3, the piston 8 is pushed in the direction of the disc rotor by the pressure of the working fluid introduced into the cylinder hole 2 d, and the friction pad 7 of the acting portion 2 a is applied. Is pressed against one side of the disk rotor 5, and the reaction force causes the caliper body 2 to move in the direction of the action part 2a, so that the reaction part 2b presses the friction pad 7 on the reaction part 2b side against the other side of the disk rotor 5. A braking action is performed.

  At this time, when the braking gap between the friction pad 7 and the disk rotor 5 is within a predetermined range, the adjustment is performed only by the movement amount of the piston 8 moving the backlash between the adjustment bolt 13 and the adjustment nut 14. Absent. When the brake gap with the disk rotor 5 exceeds a predetermined value due to wear of the friction pad 7, the piston 8 moves greatly to the disk rotor side beyond the backlash, so that the clutch plate 13b and the conical surface 8c are separated from each other. It becomes. In this state, the adjusting bolt 13 is fed out from the adjusting nut 14 by the urging force of the adjusting spring 15, and the clutch plate 13b and the conical surface 8c come into contact with each other. By releasing the brake operation in this state, the piston 8 and the adjusting bolt 13 are moved backward by the backlash, and the braking gap between the friction pad 7 and the disk rotor 5 is automatically adjusted to a predetermined range.

  In the parking brake operation by the mechanical operation mechanism 4, when the operation lever 25 is rotated by the hand lever or the foot pedal, the driving cam plate 19a is rotated together with the cam shaft 19, and the driving cam plate 19a is rotated. Each cam groove 21 is moved to a shallow portion of the ramp groove 20 due to a phase shift between each ramp groove 20 and each ramp groove 20 of the stationary cam plate 11 in the non-rotating state. The drive side cam plate 19a moves toward the disc rotor side so as to be separated. The axial movement of the driving cam plate 19a is transmitted from the adjusting nut 14 to the piston 8 via the adjusting bolt 13, and becomes a thrust force that pushes the piston 8 toward the disk rotor. The braking action is performed in the same manner as the braking action.

  In the disc brake device 1 as described above, the thrust conversion mechanism 9 and the adjustment nut 14 can be unitized by the housing 12, and the housing 12 and the fixed cam plate 11 can be easily engaged. Therefore, the workability of assembling the disc brake device 1 can be improved. The engaging groove 12g has a groove width in the circumferential direction of the housing that prevents the housing 12 and the fixed cam plate 11 from rotating when the engaging protrusion 11b is engaged, and has a fixed length in the cylinder axial direction. Since the side cam plate 11 is formed to be longer than the play size in the cylinder axial direction, the housing 12 and the fixed cam plate 11 are prevented from rotating, and the engagement protrusion 11b is disengaged from the engagement groove 12g. This can be reliably prevented, and the fixed cam plate is not detached from the housing. Further, since the thrust transmission plate 14b is engaged with the engagement hole 12e of the housing 12, the thrust transmission plate 14b maintains a non-rotatable state, and the drive side cam plate 19a is the cylindrical portion 19b of the drive side cam plate 19a. The projecting portion 19c formed on the thrust contact plate 14b contacts with the regulating piece 14e formed in the accommodation hole 14d of the thrust transmission plate 14b. Since it is held in a rotatable state only within the angle range, the parking brake operation can be performed satisfactorily. In addition, since the rotation of the drive cam plate 19a can be restricted regardless of the caliper body 2 being routed to the vehicle body, the versatility of the disc brake device 1 can be improved and the cost can be reduced. .

  6 and 7 are perspective views showing a state in which the thrust conversion mechanism and the adjustment nut according to the second and third embodiments of the present invention are unitized by a housing, and the same members as those in the first embodiment are the same as those in the first embodiment. Reference numerals are assigned and detailed description thereof is omitted. The engagement receiving portion 12i of the second embodiment shown in FIG. 6 is bent linearly in the circumferential direction from the engagement groove portion 12j formed of a slit in the cylinder axial direction and from the cylinder hole opening side of the engagement groove portion 12j. It has a guide groove 12k that is curved toward the edge on the cylinder hole bottom side and opens at the edge. Further, the engagement receiving portion 12m of the third embodiment shown in FIG. 7 includes an engagement groove portion 12n formed of a slit in the cylinder axial direction, and a cylinder hole bottom side of the housing 12 from the cylinder hole opening side of the engagement groove portion 12n. A guide groove portion 12o that is curved in an arc shape toward the edge of the opening and opens at the edge.

  As described above, if the guide groove portions 12k and 12o are formed in a curved shape or formed in an arc shape, the engagement protrusion 11b of the fixed cam plate 11 is inserted into the guide grooves 12k and 12o. 12 is automatically rotated, and the engaging protrusion 11b can enter the cylinder hole opening side of the guide grooves 12k and 12o. In particular, in the guide groove 12o formed entirely in an arc shape, the engagement protrusion 11b can be moved to the cylinder hole bottom side of the engagement groove portion 12n when the pushing force is released, so that the assembling property is further improved. be able to.

  In addition, the engagement receiving part formed in the housing is not limited to the shape of each of the above-described embodiments, and is arbitrary.

It is a principal part expanded sectional view of the disc brake apparatus which shows the 1st form example of this invention. It is II-II sectional drawing of FIG. Similarly, it is a perspective view showing a state in which a thrust conversion mechanism and an adjustment nut are unitized by a housing. FIG. 4 is an exploded perspective view of FIG. 3. It is a cross-sectional front view of the disc brake device. It is a perspective view which shows the state which united the thrust conversion mechanism and adjustment nut of the disc brake apparatus which show the 2nd example of this invention with the housing. It is a perspective view which shows the state which united the thrust conversion mechanism and adjustment nut of the disc brake apparatus which shows the 3rd example of this invention with the housing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake device, 2 ... Caliper body, 2d ... Cylinder hole, 2e ... Bottom wall, 3 ... Hydraulic operation mechanism, 4 ... Mechanical operation mechanism, 5 ... Disc rotor, 6 ... Caliper bracket, 7 ... Friction pad, DESCRIPTION OF SYMBOLS 8 ... Piston, 8a ... Bottom wall, 8b ... Fitting hole, 8c ... Conical surface, 9 ... Thrust conversion mechanism, 10 ... Adjuster, 11 ... Fixed side cam board, 11a ... Projection, 11b ... Engagement projection, 11c ... Insertion Hole 12, housing 12 a, large diameter cylindrical portion 12 b, small diameter cylindrical portion 12 c, 12 i, 12 m, engagement receiving portion 12 d, mounting piece 12 e, engagement hole 12 f, support piece 12 g, 12 j, 12n: engaging groove, 12h, 12k, 12o: guide groove, 13: adjusting bolt, 13a: small diameter piston, 13b: clutch plate, 14: adjusting nut, 14a: multi-thread screw, 14b: thrust transmission plate 14c ... projection for engagement, 14d ... accommodation hole, 14e ... regulating piece, 15 ... adjustment spring, 16 ... bearing receiver, 17 ... retaining ring, 18 ... bearing, 19 ... camshaft, 19a ... drive side cam plate, 19b ... Cylindrical part, 19c ... Projection, 20 ... Ramp groove, 21 ... Cam bearing, 22 ... Thrust bearing, 23 ... Cam spring, 24 ... C-ring

Claims (3)

  A piston housed on the tip opening side of the cylinder hole, a thrust converting mechanism disposed on the bottom side of the cylinder hole, and an adjuster having an adjusting nut and an adjusting bolt provided between the thrust converting mechanism and the piston A disc brake device including a parking brake that pushes the piston from the thrust conversion mechanism via an adjuster, wherein the thrust conversion mechanism includes a fixed cam plate attached to a bottom wall of the cylinder hole A camshaft penetrating the cylinder hole bottom wall and the fixed cam plate so as to be rotatable and movable in the cylinder axial direction; and a drive cam plate provided at the cylinder hole opening side end of the camshaft A ramp groove formed at a position opposed to the drive side cam plate and the fixed side cam plate, and a cam bearing accommodated in the ramp groove, And the adjuster includes a thrust transmission plate at a cylinder hole bottom side end facing the driving cam plate of either one of an adjustment nut and an adjusting bolt, the thrust transmission plate, the driving cam plate, In a disc brake device in which a cam spring for urging the thrust transmission plate in the direction of the driving cam plate is housed in a substantially cylindrical housing mounted in the cylinder hole, In addition to projecting an engaging projection, an engagement receiving portion for engaging the engaging projection is provided at the cylinder hole bottom side end portion of the housing, and the engaging receiving portion is an engagement formed by a slit in the cylinder axial direction. A groove portion and a guide groove portion that is formed in a direction that opens to the edge on the cylinder hole bottom side after being bent in the circumferential direction from the cylinder hole opening side of the engagement groove portion, Mosquito Disc brake device, wherein the engaging projection by the biasing force of the spring is mounted on the cylinder bore bottom portion side end portion of the pressing has been said housing cylinder bore bottom portion side of the engagement groove.   The engaging groove portion has a groove width in the circumferential direction of the housing that prevents the rotation of the housing and the fixed cam plate when the engaging protrusion is engaged, and the length in the cylinder axial direction is the length of the fixed cam plate. 2. The disc brake device according to claim 1, wherein the disc brake device is formed in a dimension longer than a play dimension in a cylinder axial direction.   The housing is provided with an engaging portion that engages with the thrust transmission plate at an intermediate portion in the cylinder axial direction to prevent the thrust transmission plate from rotating, and between the thrust transmission plate and the driving cam plate. 2. The disc brake device according to claim 1, further comprising a restricting means for restricting a rotation amount of the driving cam plate within a range in which the cam bearing does not fall out of the ramp groove.

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