JP2002364689A - Disk brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk brake for vehicle capable of improving the assemblability of a member into a caliper by unitizing the member having a spring and a spring retainer fitted into the bottom part of a cylinder hole of the caliper in non-rotated state selected from two members forming an automatic clearance adjusting mechanism. SOLUTION: In this disk brake for vehicle, a first member of the automatic clearance adjusting mechanism comprises a push rod 37, a caliper 31, and a key plate 139 slidably engaged with the push rod 37, the spring retainer 140 is engaged with the key plate 139 in the state of compressing the spring 42 to a generally set length beforehand, and the first member, the spring 42, and the spring retainer 140 are unitized to form an assembly. Thus, the handling of the assembly and the installation of the assembly in the caliper 31 is facilitated, and the assembly is prevented from being extracted out of the cylinder hole 33 by a retaining ring 41 in the state where the assembly is installed at the bottom part of the caliper 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic clearance adjusting device capable of automatically adjusting a braking clearance between a brake disc and a friction pad in a cylinder hole of a caliper and transmitting a brake operating force from a mechanical operation input unit. The present invention relates to a disk brake for a vehicle having a mechanism and having improved assemblability of an automatic clearance adjusting mechanism.

[0002]

2. Description of the Related Art Conventionally, as disc brakes for vehicles,
A caliper supported by a vehicle fixing member and having a cylinder hole formed therein; a piston mounted inside the caliper and operated by receiving a brake working fluid pressure supplied to the cylinder hole to press a friction pad against a rotating disk An automatic clearance adjustment mechanism disposed in the cylinder bore and capable of adjusting the clearance between the friction pad and the disk in response to the operation of the piston and transmitting brake operation force from a mechanical operation input unit to the friction pad. An assembly comprising a push rod and a sleeve nut having variable lengths for adjusting a braking clearance by screw engagement with each other, and a spring for biasing the push rod in a brake releasing direction. Some are made up of An example of such a vehicle disc brake is disclosed in Japanese Patent No. 2628.
No. 325. The disc brake disclosed in the above patent publication is shown in FIGS. FIG. 11 is a sectional view of a conventional disc brake,
FIG. 12 is an enlarged perspective view showing a part thereof. This disc brake has an inner leg 31A and an outer leg 31A.
B, and a mounting bracket 32 as a vehicle fixing member for slidably supporting the caliper 31.
And A bifurcated claw 31C is formed on the outer leg 31B. A cylinder hole 33 communicating with the brake fluid supply port 31D is provided in the inner leg 31A.
A cam chamber 35 that communicates with the cylinder hole 33 through the insertion hole 34 and the like and houses the cam 22 as a mechanical operation input unit is formed. The caliper 31 has a cylinder hole 33
Large-diameter concave portion 3 is located between
6 is formed in a shallow cylindrical shape. An engagement groove 36A having a U-shaped cross section is formed in the peripheral wall of the concave portion 36 so as to extend in the axial direction, and a mounting groove 36B for fitting the retaining ring 41 is formed in an intermediate portion in the axial direction. I have. Cam 22
In the automatic clearance adjusting mechanism, the push rod 37 pushes the sleeve nut 11 in the axial direction to push the piston 8 at the time of the operation of the manual brake for actuating. A plurality of external threads 37A are formed on the distal end side of the push rod 37, and the proximal end side of the push rod 37 is a sliding shaft portion 37B that is slidably inserted into the insertion hole.
As shown in FIG. 12, a two-sided chamfered portion 37C is formed on the outer periphery of the sliding shaft portion 37B as a two-surface width with which a key plate 39 described later is engaged. A disc-shaped retainer 38 is fixed to the distal end side of the sliding shaft portion 37B of the push rod 37. A substantially rectangular engagement hole 39A is formed on the inner peripheral side of the thick disk-shaped key plate 39, and an engagement protrusion 39B having a U-shaped cross section is formed on the outer periphery in the radial direction. Has been established. The key plate 39 is inserted into the concave portion 36 of the caliper 31, and the engaging hole 39A engages with the double-sided portion 37C of the push rod 37, and the engaging protrusion 39B engages with the engaging groove 36A of the concave portion 36, respectively. Thus, the push rod 37 functions as a rotation restricting means that restricts the rotation of the push rod 37 but allows the slide in the axial direction. Caliper 31
A cylindrical spring receiver 40 is provided in the axial direction so as to surround the push rod 37 from the cylinder hole 33 to the inside of the concave portion 36. The inner side of the cylinder hole 33 of the spring receiver 40 becomes an annular flange portion 40A extending to a position in contact with the key plate 39 and protruding outward in the radial direction, and a retaining ring 41 fitted in the mounting groove 36B of the concave portion 36 has a flange. Part 40
The key plate 39 is prevented from coming off by being locked to A. The opening side of the cylinder hole 33 of the spring receiver 40 is an annular receiving part 40B that extends toward the outer peripheral side of the sleeve nut 11 and protrudes radially inward, and between the receiving part 40B and the retainer 38. , A spring 42 that constantly urges the push rod 37 toward the non-braking side is provided. In this example, the single retaining ring 41 prevents the spring receiver 40 and the key plate 39 from coming off from the concave portion 36 formed on the bottom side of the cylinder hole 33 of the caliper 31, thereby reducing the number of parts. It is planned. In addition, since the key plate 39 is engaged with the both-side chamfered portion 37C of the push rod 37, the rotation of the push rod 37 is restricted, and the push rod 37 only slides in the axial direction. The sleeve nut 11 that has advanced while rotating with respect to 37 is prevented from rattling in the rotational direction together with the push rod 37 when the braking operation is released, and the return position of the piston 8 is regulated, so that each friction pad 1
Automatically adjusts the gap between 0 and the disc optimally. Even if a dimensional error occurs in the plate thickness dimension of the key plate 39 or the flange portion 40A of the spring receiver 40, the engagement projection 39B of the key plate 39 does not come off from the engagement groove 36A on the peripheral wall side. On the bottom side, the rotation of the key plate 39 against the peripheral wall of the concave portion 36 can be stabilized for a long time.

[0003] The assembly of the disc brake with the automatic clearance adjusting device is performed as follows. That is, after the rod 14 is loaded in a state where the rod 14 is abutted against the cam 22 as a mechanical operation input unit operated at the time of manual braking or the like, the sliding shaft portion 37B of the push rod 37 is inserted into the insertion hole 34 of the caliper 31. Next, the key plate 39 is inserted into the large-diameter recess with the engagement hole 39A fitted into the double-sided chamfered portion 37C of the push rod 37 and the engagement projection 39B engaged with the engagement groove 36A of the recess 36. It is loaded at its bottom along the circumference of 36. Next, the retainer 38 and the spring 42 are loaded around the push rod 37, and the spring receiver 40 is pushed in while compressing the spring 42 until the annular flange portion 40A of the cylindrical spring receiver 40 is pressed against the key plate 39. In the pushed state, the retaining ring 41 is engaged with the mounting groove 36B formed in the concave portion 36. As a result, the push rod 37 is assembled in a state in which the push rod 37 is urged to the rear side of the cylinder hole 33 by the spring 42. Thereafter, a rotation control device 12 for applying an urging force to rotate the screw when the piston 8 advances.
Push nut 3 with sleeve nut 11
7 and the piston 8 is assembled into the cylinder hole 33, thereby completing the assembly of the disc brake. By assembling the key plate 39 and the spring receiver 40 collectively with the retaining ring 41, the workability of assembling the disc brake is improved. It is necessary to perform an operation of assembling to the bottom, and compressing the spring 42 from the free state to the set length on the back side of the cylinder hole 33,
Requires a skilled work and a long work time, and there is room for further improvement in workability.

A vehicle disc brake incorporating an automatic clearance adjusting mechanism is disclosed in Japanese Utility Model Laid-Open Publication No. 60-40835. In the vehicle disc brake disclosed in this publication, an adjusting bolt, which is a component of the automatic clearance adjusting mechanism and corresponds to the push rod, is urged toward the back of the cylinder hole by an adjusting spring. Is also locked by the retainer stopper engaged with the circumferential groove in a state where the adjust spring is pushed to the compressed state.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to dispose between a mechanical operation input section and a piston to transmit an operating force from the mechanical operation input section to the piston. In a vehicle disk brake having a screw-type automatic clearance adjusting mechanism for automatically adjusting a braking clearance between a disk and a friction pad, two members that rotate relatively to change the overall length in the axial direction are provided. Of these, a rotation-restricted member that is mounted on the back side of the caliper cylinder hole, a spring that returns the rotation-controlled member to the inoperative position when the brake operation is released, and a spring receiver that receives the spring force of the spring , To improve the assemblability into the caliper,
The idea is to make it into a unitized assembly. SUMMARY OF THE INVENTION An object of the present invention is to provide an assembly in which the above-described member whose rotation is restricted, a spring receiver, and a spring are assembled in advance, so that the caliper can be easily handled in a cylinder hole and the assemblability is improved. Is to provide the brakes.

[0006]

According to the present invention, there is provided a caliper supported by a vehicle fixing member, a mechanical operation input portion disposed on the caliper, and a disk which is slidably fitted in the cylinder hole and which is engaged with the disc when the brake is operated. A piston that presses a friction pad, and is disposed between the piston and the mechanical operation input unit in the cylinder hole and transmits an operation force of the mechanical operation input unit to the piston, and the friction pad and the piston An automatic gap adjusting mechanism for adjusting a gap between the disks, wherein the automatic gap adjusting mechanism is engaged with the mechanical operation input unit and is slidable relative to the caliper by rotation restricting means. A first member which is restricted to be unable to rotate relative to the first member. The first member is engaged with the first member and is engageable with the piston. A second member whose axial relative position with respect to the first member can be changed by counter-rotation, a spring for urging the first member in the non-braking direction when the mechanical operation input unit is released, and a spring force of the spring. A spring ring that is received by the caliper and that engages with the caliper to prevent the first member and the spring from being pulled out of the cylinder hole; The first spring in a state where the spring is compressed to a substantially set length in advance and in a state in which the compression of the spring is increased by the displacement of the first member when the mechanical operation input unit is operated.
The present invention relates to a vehicle disk brake which is engaged with a member. According to this vehicle disc brake, at the time of service braking, for example, when the brake working fluid is supplied into the cylinder bore, the piston advances at that pressure, and when the braking operation is input from the mechanical operation input unit, The piston advances through the automatic gap adjusting mechanism including the first member and the second member, and the friction pad is pressed against the brake disk. That is, the first member is allowed to slide relative to the caliper by the rotation restricting means, but is restricted so as not to rotate relative to the caliper. , The first member advances while further compressing the spring held in the compressed state by the spring receiver engaged with the first member, and pushes out the piston via the second member.
When the operation of the mechanical operation input unit is released, the second member returns to the braking release position together with the first member because the spring urges the first member in the non-braking direction, and the piston accordingly becomes non-braking. Return to the braking position. When the gap between the friction pad and the brake disc increases, the first member and the second member are changed in axial relative position so that the total length of both members is increased by the relative rotation of both members, The gap is automatically adjusted to a predetermined size. Since the spring receiver is engaged with the first member in a state where the spring has been compressed to a substantially set length in advance, the assembly including the first member, the spring and the spring receiver is pre-unitized. The assembly is mounted in the inner part of the caliper in its unitized state, and the retaining ring locked to the caliper prevents the removal from the cylinder hole, so that the assembly is handled and assembled to the caliper. And easier. The first member receives a brake operation force from the mechanical operation input unit, is engaged with the push rod formed with the male screw portion, and is relatively non-rotatably engaged with the push rod. A key plate which is engaged with the key plate so as to be relatively non-rotatable; the spring receiver is engaged with the first member in advance by engaging with the key plate; and the second member is screwed into the male screw portion of the push rod. This is a sleeve nut having a female screw portion to be formed. That is, in this case, the first member and the second member of the automatic clearance adjusting mechanism are a push rod and a sleeve nut, respectively, which are screw-engaged with each other. The rotation of the push rod with respect to the caliper is restricted by a key plate as rotation restriction means, and the overall axial length of the push rod is changed by relative rotation of the sleeve nut with respect to the push rod. Further, the first member includes:
A brake nut from the mechanical operation input unit is transmitted, and the sleeve nut is formed with a female screw portion and a flange portion that is non-rotatably engaged with the caliper as the rotation restricting means. The second member is a push rod which is previously engaged with the flange portion and is screwed to the sleeve nut. That is, in this case, the first member and the second member of the automatic clearance adjusting mechanism are a sleeve nut and a push rod, respectively, which are screw-engaged with each other. The rotation of the sleeve nut with respect to the caliper is restricted by a flange portion serving as rotation restricting means, and the entire axial length of the sleeve nut is changed by the relative rotation of the push rod with respect to the sleeve nut. Further, the first member has a width across which a brake operation force from the mechanical operation input section is transmitted and which engages with the external thread section and the mechanical operation input section as the rotation restricting means so as to be relatively non-rotatable. The push rod is formed, wherein the spring receiver is pre-engaged with the push rod, and the second member is a sleeve nut having a female screw portion screwed into the male screw portion of the push rod. That is, in this case, the first member and the second member of the automatic clearance adjusting mechanism are a push rod and a sleeve nut, respectively, which are screw-engaged with each other. The rotation of the push rod with respect to the caliper is restricted by the two-face width engagement between the push rod as the rotation restricting means and the mechanical operation input unit, and the rotation of the sleeve nut relative to the push rod restricts the rotation of the push rod. The overall axial length is changed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a disk brake according to an embodiment of the present invention; 1 is a sectional view showing a first embodiment of a vehicle disk brake according to the present invention, FIG. 2 is a perspective view of a spring support used in the vehicle disk brake shown in FIG. 1, and FIG. 3 is a vehicle disk shown in FIG. FIG. 4 is a side sectional view showing an assembly unitized in advance in the vehicle disk brake shown in FIG. 1. The assembly shown in FIGS. 1 and 4 is shown in cross section taken along the line BB in FIG. 1 to 4, FIGS. 11 and 12
The same components and parts as those used in the conventional vehicle disc brake shown are denoted by the same reference numerals as those shown in FIG. 11 and FIG. Omitted. In the vehicle disc brake 1 shown in FIGS. 1 to 4 as a first embodiment, a push rod 37 included in a first member is disposed on the back side of a cylinder hole 33, and a sleeve as a second member is provided. A nut 11 is provided near the piston 8. Multi-threaded external thread portion 37 formed on push rod 37
A is screwed into a multi-threaded female screw portion 11A formed on the sleeve nut 11. The mechanical operation input unit 120 includes:
An operating shaft 23 and a cam 22 formed by cutting out the tip thereof.
The brake operation force from the cam 22 can be transmitted to the piston 8 from the tapered surface 11B of the sleeve nut 11 via the push rod 37. As shown in FIG. 2, an annular receiving portion 140 </ b> B is formed on the distal end side of the spring receiver 140 and extends toward the outer peripheral side of the sleeve nut 11 as the second member and protrudes radially inward. The receiving portion 140B supports a spring 42 that constantly biases the push rod 37, which is the first member, toward the inner side of the cylinder hole 33, which is the non-braking side, between the receiving portion 140B and the retainer 38. A flange portion 14 extending in the radial direction is provided on the proximal end side of the spring support 140.
0A and the protrusions 140C protruding in the axial direction are alternately formed in the circumferential direction. As shown in FIG. 3, the key plate 139 as the rotation restricting means has a substantially rectangular engagement with a double-sided chamfered portion 37C formed to have a two-sided width of the push rod 37, similarly to the conventional key plate 39. Hole 1
39A and an engagement protrusion 139B that engages with the engagement groove 36A of the concave portion 36 are formed. However, a notch 139C is formed in the key plate 139 corresponding to the projection 140C of the spring receiver 140, and a bent portion bent at the tip of the projection 140C of the spring receiver 140 engaged with the notch 139C. 140D is engaged with the depression 139D connected to the notch 139C (reference numeral 139).
C, 139D, 140C, and 140D are only partially shown for simplification of the drawing). Retainer 38, spring 42, key plate 139 and spring receiver 14 for push rod 37
The assembly of P0 can be performed in advance outside the caliper 31, and an assembly P1 thus unitized is shown in FIG. The spring 42 is held in a state where its spring force is compressed between the key plate 139 and the spring receiver 140 to make the spring 42 an internal force. The assembly P1 is inserted into the cylinder hole 33 in a unitized state, and the sliding shaft portion 37B of the push rod 37 is inserted into the insertion hole 34. At this time, the spring 42 in the compressed state is The restoring force is in a state of being internalized by the spring receiver 140, so that the operator does not need to push the spring receiver 140 against the spring force of the spring 42 in the narrow cylinder hole 33. Also, the assembly P1
The retaining ring 41 attached to the mounting groove 36B formed in the concave portion 36 is engaged with the flange portion 140A to prevent the cylinder ring 33 from being pulled out.
Thereafter, by screwing the sleeve nut 11 to the push rod 37, the piston 8 and the rotation control device 12 can be assembled together. When the operation force from the cam 22 acts on the push rod 37, the push rod 3
7 can be displaced in a direction to further increase the compression of the spring 42 held in a compressed state by the spring receiver 140 retained by the retaining ring 41, and push the sleeve nut 11 toward the piston 8. When the operation force of the cam 22 is released, the push rod 37 is returned in the non-braking direction by the restoring force of the spring 42.

A second embodiment of the vehicle disk brake according to the present invention is shown in FIGS. FIG. 5 is a sectional view showing a second embodiment of the vehicle disk brake according to the present invention, and FIG. 6 is a sectional view of the vehicle disk brake C shown in FIG.
7 is a side sectional view of a unitized assembly of the vehicle disk brake shown in FIG. 5. FIG.
The section of the automatic gap adjusting mechanism is shown by a cross section taken along a plane indicated by DD in FIG. In the second embodiment shown in FIGS. 5 to 7, the same components and parts as those used in the conventional vehicle disk brake shown in FIGS. 11 and 12 are denoted by the same reference numerals. The same reference numerals are given to omit duplicate explanations. In the vehicle disk brake 2 shown in FIGS. 5 to 7 as a second embodiment, a sleeve nut 111 as a first member is disposed on the back side of the cylinder hole 33 and a push rod 47 as a second member. Is disposed closer to the piston 8. The mechanical operation input unit 120 has an operation shaft 23 and a cam 22 formed by cutting out a tip of the operation shaft 23. The rod 14 that engages with the cam 22 is formed at the innermost portion of the cylinder hole 33. Through an intermediate piston 43 inserted into the insertion hole 34. Although the intermediate piston 43 has been described as being separate from the sleeve nut 111, both may be configured integrally. Push rod 47
The rotation is regulated by the rotation control device 12 by the contact with the piston 8, but when the contact with the piston 8 is released, the rotation is given by the urging force in the axial direction. The sleeve nut 111 includes a multi-threaded female screw portion 111A screwed into the multi-threaded male screw portion 47A formed on the push rod 47, and a semicircular convex portion 111C engaged with the engaging groove 36A of the caliper 31. Formed flange portion 111
B. The flange portion 111B is
C engages with the engagement groove 36A, so that the caliper 31
A rotation restricting means for making the sleeve nut 111 relatively unrotatable with respect to the motor is constituted. The brake operation force from the cam 22 is transmitted through the rod 14, the intermediate piston 43, the sleeve nut 111, and the push rod 47 in that order.
The power is transmitted to the piston 8 from the taper engagement surface 47B of the push rod 47. Since the spring receiver that receives the spring force of the spring 42 has basically the same structure as the spring receiver in the first embodiment, the same reference numerals as in the first embodiment are used for the respective parts. ing. The spring nut 140 is engaged with the flange portion 111B of the sleeve nut 111 in advance, so that the sleeve nut 111 and the spring 4
2 and the spring receiver 140, as shown in FIG.
Is previously unitized. That is, a notch 111D is formed in the flange portion 111B of the sleeve nut 111 in correspondence with the projection 140C of the spring receiver 140. The spring receiver 140 compresses the spring 42 to a substantially set length and cuts it. A unit is formed by engaging the bent portion 140D bent at the tip of the projection 140C engaged with the notch 111D with the back surface of the flange portion 111B. The spring 42 is held in a state where its spring force is compressed between the flange portion 111B and the spring receiver 140 to make the spring 42 an internal force. The assembly of the spring 42 and the spring receiver 140 with respect to the sleeve nut 111 can be performed in advance outside the caliper 31, and the unitized assembly P2 is
This is shown in FIG. The intermediate piston 43 is inserted into the insertion hole 34, and then the assembly P2 is inserted into the cylinder hole 33 in a state of being unitized.
As in the case of the embodiment, since the restoring force of the spring 42 in a compressed state is in a state of being made internal by the spring receiver 140, the operator can resist the spring force in the narrow cylinder hole 33 against the spring force of the spring 42. There is no need to push the receiver 140. Further, the assembly P2 is provided with a mounting groove 36B formed in the concave portion 36.
By engaging the retaining ring 41 mounted on the flange portion 140A with the retaining ring 41, the retaining ring 41 is prevented from coming out of the cylinder hole 33. Thereafter, by screwing the push rod 47 into the sleeve nut 111, the piston 8 and the rotation control device 12 can be assembled together. The operating force from the cam 22 of the mechanical operation input unit 120 is applied to the sleeve nut 1
When acting on the piston 11, the sleeve nut 111 is displaced so as to further increase the compression of the spring 42 held in a compressed state by the spring receiver 140 retained by the retaining ring 41, and pushes the push rod 47 to the piston 8. Can be pushed out. When the operation force from the cam 22 is released, the sleeve nut 111 is returned in the non-braking direction by the restoring force of the spring 42 until the flange portion 111B is restricted by the bent portion 140D of the spring receiver 140.

A third embodiment of the vehicle disk brake according to the present invention is shown in FIGS. FIG. 8 is a sectional view showing a third embodiment of the vehicle disk brake according to the present invention, and FIG. 9 is a sectional view of the vehicle disk brake shown in FIG.
FIG. 10 is a side sectional view of the unitized assembly of the vehicle disk brake shown in FIG. 8. 8 is a sectional view taken along line FF in FIG. 9. In the third embodiment, the same components and parts as those used in the conventional vehicle disk brake shown in FIGS. 11 and 12 are denoted by the same reference numerals as those of the conventional one. Therefore, duplicate description will be omitted. In the vehicle disk brake 3 shown in FIGS. 8 to 10 as a third embodiment, a push rod 137 as a first member is disposed on the back side of the cylinder hole 33 as in the first embodiment. Further, a sleeve nut 11 as a second member is disposed near the piston 8. The multi-threaded male thread 137A formed on the distal end side of the push rod 137 is screwed into the multi-threaded female thread 11A formed on the sleeve nut 11. The mechanical operation input unit 120 has an operation shaft 23 and a cam 22 formed by cutting out a tip of the operation shaft 23. The sliding shaft portion 137B of the push rod 137 is inserted into an insertion hole 34 formed at the innermost portion of the cylinder hole 33, and
The extreme end 137C of 37B is arranged so as to directly engage with the cam 22 of the mechanical operation input unit 120. Cam 22
Is the end surface 13 of the end 137C of the push rod 137.
7E, the mechanical operating force for rotating the cam 22 is converted into the axial force of the push rod 137 and transmitted to the piston 8 via the sleeve nut 11. The push rod 137 has an outermost end 137C formed on both sides 137D, 137D having a two-sided width by cutting a side facing the axial direction of the operation shaft 23 into a plane. When the cam 22 is formed, the chamfered portions 137D and 137D
The chamfered portions 137D, 137D engaged with each other and the side surfaces 24, 24 constitute rotation restricting means for restricting rotation of the push rod 137. The sleeve 8 has a piston 8
There is provided a rotation control device 12 that restricts rotation by engagement with the piston 8 but applies rotation by an axial biasing force when the engagement with the piston 8 is released. Push rod 1
The spring bearing for receiving the spring force of the spring 42 for urging the 37 in the non-braking direction has basically the same structure as the spring bearing in the first embodiment. The same reference numerals are used. That is, on the distal end side of the spring receiver 140, an annular receiving portion 140 extending toward the outer peripheral side of the sleeve nut 11 as the second member and protruding inward in the radial direction is provided.
B is formed, and the receiving portion 140 </ b> B pushes the push rod 137, which is the first member, between the push rod 137 and the flange portion 137 </ b> F formed at an intermediate portion of the push rod 137, on the inner side of the cylinder hole 33 on the non-braking side. Spring 4 constantly biased toward
2 is supported. On the base end side of the spring receiver 140, radially extending flange portions 140A and axially projecting protrusion portions 140C are alternately formed in the circumferential direction. With the spring receiver 140 compressing the spring 42 to approximately the set length, the bent portion 140D formed by bending the tip of the protrusion 140C is moved to the flange 1 of the push rod 137.
By engaging with the back of 37F, the push rod 137
The assembly of the spring 42 and the spring receiver 140 with respect to can be performed in advance outside the caliper 31, and an assembly P3 as a first member unitized in such a manner is shown in FIG. The spring 42 has a restoring force of the collar 137F.
And the spring support 140 are compressed and held in an internal force state. The assembly P3 is inserted into the cylinder hole 33 in a unitized state.
The sliding shaft portion 137B is inserted into the insertion hole 34 to a position where the end portion 137E of the second member 7 engages with the cam 22. At this time, as in the first embodiment, the compressed spring 42
Since the restoring force is in the state of being made internal by the spring receiver 140, there is no need for the operator to push the spring receiver 140 against the spring force of the spring 42 in the narrow cylinder hole 33. Further, in the assembly P3, the retaining ring 41 mounted in the mounting groove 36B formed in the concave portion 36 is engaged with the flange portion 140A to prevent the assembly P3 from being removed from the cylinder hole 33. Then, by screwing the sleeve nut 11 to the push rod 137, the piston 8 and the rotation control device 12 can be assembled together. When the operating force from the cam 22 of the mechanical operation input unit 120 acts on the push rod 137, the push rod 137
The sleeve nut 11 can be pushed toward the piston 8 by being displaced so as to further increase the compression of the spring 42 held in the compressed state by the spring receiver 140 retained by the retaining ring 41. When the operating force of the cam 22 is released, the push rod 137 has
Until regulated by the bent portion 140D of 40, the spring 42 returns to the non-braking direction by the restoring force.

[0010]

According to the disk brake for a vehicle according to the present invention constructed as described above, the operating force is transmitted from the mechanical operation input portion to the piston between the mechanical operation input portion and the piston, and the disk is moved. Of the two members that rotate relative to each other to change the overall length of the screw-type automatic clearance adjustment mechanism that is provided to automatically adjust the clearance between the The member that is mounted in a state where the rotation is restricted to the back of the member includes a spring that returns the member whose rotation is restricted to the non-operation position when the brake operation is released, a spring receiver that receives the spring force, and an internal force of the spring. And can be unitized as a pre-assembled assembly. Further, since the second member disposed on the piston side is a member rotatable relative to the caliper, and the first member is a member non-rotatable relative to the caliper, a unit including the first member is unitized. The three-dimensional structure is simplified, and the number of parts is reduced. Therefore, the vehicle according to the present invention can be compared with a conventional disc brake in which a rotation-regulated member, a spring support, and a spring are mounted one by one, and the spring is pressed down and mounted with a retaining ring while being compressed. According to the disc brake for use, the assembly including the first member and the spring can be collectively mounted in the caliper without needing to keep pressing the spring to compress the spring, and can be mounted in the cylinder hole of the caliper. Can be easily handled, and the assembling property can be improved.

[Brief description of the drawings]

FIG. 1 is a first view of a vehicle disk brake according to the present invention;
It is sectional drawing which shows an Example.

FIG. 2 is a perspective view of a spring receiver used in the vehicle disc brake shown in FIG.

FIG. 3 is a sectional view taken along line AA of the vehicle disk brake shown in FIG. 1;

FIG. 4 is a side sectional view showing a pre-integrated assembly including a first member in the vehicle disc brake shown in FIG. 1;

FIG. 5 shows a second embodiment of the vehicle disc brake according to the present invention.
It is sectional drawing which shows an Example.

6 is a cross-sectional view of the vehicle disc brake shown in FIG. 5, taken along line CC.

FIG. 7 is a side sectional view of a unitized push rod assembly of the vehicle disc brake shown in FIG. 5;

FIG. 8 is a third example of the vehicle disc brake according to the present invention;
It is sectional drawing which shows an Example.

FIG. 9 is a sectional view taken along line EE of the vehicle disk brake shown in FIG. 8;

FIG. 10 is a side sectional view of a unitized assembly of the vehicle disc brake shown in FIG. 8;

FIG. 11 is a sectional view showing a conventional disc brake.

FIG. 12 is an enlarged perspective view showing a part of the disc brake shown in FIG. 11;

[Explanation of symbols]

 1, 2, 3 ... Disc brake for vehicle 7 ... Disc 8 ... Piston 10 ... Friction pad 11 ... Sleeve nut (second member) 11A ... Female screw part 22 ... Cam 23 ... operation shaft 24 ... side surface 31 ... caliper 32 ... bracket (vehicle fixing member) 33 ... cylinder hole 37 ... push rod (first member) 37A ... Male thread 41: retaining ring 42: spring 47: push rod (second member) 47A: multiple male thread 111: sleeve nut (first member) 111A: multiple Female part 111B ... flange part (rotation restricting means) 120 ... mechanical operation input part 137 ... push rod (first member) 137A ... multiple male screw part 137D ... chamfered part ( Rotation regulation Step) 137F ・ ・ ・ Flange 139 ・ ・ ・ Key plate (rotation restricting means) 139A ・ ・ ・ Engagement hole 139B ・ ・ ・ Engagement protrusion 139C ・ ・ ・ Cut 140 ・ ・ ・ ・ Spring receiver 140A ・ ・ ・ Flange Part 140C: Projection part 140D: Bend part

Claims (5)

[Claims] 1. A caliper supported by a vehicle fixing member, a mechanical operation input portion provided on the caliper, a friction pad which is slidably fitted in a cylinder hole provided in the caliper, and which applies a friction pad to a disc when a brake is actuated. A piston that presses, and is disposed between the piston and the mechanical operation input unit in the cylinder hole and transmits an operation force of the mechanical operation input unit to the piston, and is disposed between the friction pad and the disk. An automatic gap adjusting mechanism for adjusting the gap of the caliper. The automatic gap adjusting mechanism engages with the mechanical operation input unit and is slidable relative to the caliper by rotation restricting means. A first member, which is restricted to be inoperable, and which is screwed to the first member and is engageable with the piston, and the first member for adjusting the gap.
A second member whose axial relative position with respect to the first member can be changed by relative rotation with the member, a spring for urging the first member in a non-braking direction when the mechanical operation input unit is released from operation, A spring retainer that receives a spring force, and a retaining ring that is locked to the caliper and engages the spring retainer to prevent the first member and the spring from being pulled out of the cylinder hole, The first member is provided in a state where the spring is compressed to a substantially set length in advance and the compression of the spring is increased by displacement of the first member when the mechanical operation input unit is operated. Disc brake for a vehicle, which is engaged with a vehicle. 2. A push rod, to which a brake operation force from the mechanical operation input section is transmitted and a male screw section is formed, and the first member is engaged with the push rod so as to be relatively non-rotatable, and the first member is restricted in rotation. As means, the key plate comprises a key plate engaged with the caliper so as not to rotate relative to the caliper.
2. The disc brake according to claim 1, wherein said second member is a sleeve nut having a female threaded portion screwed to said male threaded portion of said push rod. 3. The first member is formed with a female screw portion and a flange portion which is non-rotatably engaged with the caliper as the rotation restricting means, the brake operation force being transmitted from the mechanical operation input portion. The vehicle according to claim 1, wherein the spring support is pre-engaged with the flange portion, and the second member is a push rod having a male thread portion screwed to the sleeve nut. For disc brakes. 4. The first member has two surfaces to which a brake operation force from the mechanical operation input portion is transmitted and which engages with the male screw portion and the mechanical operation input portion as the rotation restricting means so as to be relatively unrotatable. A push rod having a width and
2. The disk brake according to claim 1, wherein said spring support is previously engaged with said push rod, and said second member is a sleeve nut having a female screw portion screwed into said male screw portion of said push rod. 5. The disk drive according to claim 1, wherein said rotation restricting means is connected to an engagement protrusion projecting from said first member in a radial direction of said disk, and to a bottom of said cylinder hole engaged with said engagement protrusion. 2. The disc brake for a vehicle according to claim 1, wherein the engagement groove extends in a direction of the disc brake.