JP3275111B2 - Caliper body of vehicle disc brake - Google Patents

Abstract

PURPOSE:To improve an assembling characteristic to a cylinder hole and to reduce the number of interpolated parts and the number of processes by unitiz ing the interpolated parts of a cylinder hole previously. CONSTITUTION:A spring guide 27 is provided with a spring seat part, 27a and falling off preventing pieces 27b, 27b and is installed to a sleeve piston 12. An adjust spring 28 is compressed and arranged between a bearing seat 25 and the spring seat part 27a. Locking pins 22, 22 are prevented from falling off from the sleeve piston 12 by the falling off preventing pieces 27b, 27b. At least the sleeve piston 12, the adjust bolt 23, the bearing 24, the bearing seat 25, and the adjust spring 28, or those and the piston 11, among the interpolated parts to the cylinder holder 8 are previously unitized integrally as an assembly unit by the spring seat part 27a and the falling off preventing pieces 27b, 27b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for use in a traveling vehicle such as a four-wheeled vehicle, and relates to a caliper body having a unit inside a cylinder hole to improve assemblability and workability. Regarding the structure.

[0002]

2. Description of the Related Art Disc brakes used in four-wheeled vehicles and the like are disclosed, for example, in Japanese Utility Model Laid-Open Publication No. 61-58744. This disc brake is equipped with a hydraulic brake operated by a brake pedal and a mechanical brake operated by a hand lever or a foot pedal. The parking brake has a piston and cylinder on the cylinder hole opening side. An adjuster including an adjust bolt and an adjust nut is arranged between the sleeve piston on the bottom side of the hole.

The adjust bolt is engaged with the clutch plate of the sleeve piston by the elastic force of the adjust spring contracted between the clutch plate and the spring retainer, and the lining of the friction pad is worn by a predetermined amount. At this time, the clutch is disengaged, and the adjusting bolt is rotated to automatically change the screwing position with the adjusting nut, so that the braking gap between the disk rotor and the friction pad is kept constant.

[0004] The rotation of the sleeve piston is restricted by a pair of detent pins spanned between the sleeve piston and the bottom wall of the cylinder hole. The adjustment function is ensured.

[0005]

In such a configuration, the minimum assembly unit is from assembly of the sleeve piston to fitting of the circlip for retaining the spring retainer. An adjust bolt, a bearing, a bearing receiver, an adjust spring, and a spring retainer are provided between the circlip and the circlip. Therefore, these must be incorporated into the cylinder hole one by one in order. If the clip is fitted together, it is a complicated thing that requires a lot of time and labor to assemble, and furthermore, it is necessary to make a groove for mounting the circlip in the cylinder hole. No.

The above-mentioned detent pin must be fixed to either the sleeve piston or the bottom wall of the cylinder hole so that it does not fall off when the sleeve piston is assembled. In addition to the necessity, in order to fit the detent pin into the other pin hole, it is necessary to precisely control the dimension in fixing the detent pin and forming the pin hole.

The present invention has been made in view of such circumstances, and the unitization of the internal parts of the cylinder hole improves the assemblability of these internal parts, and also reduces the number of parts and the number of processing steps. An object of the present invention is to provide a caliper body of a disc brake for a vehicle which aims to reduce the cost.

[0008]

According to the above-mentioned object, a first method is provided.
According to the present invention, an adjuster is provided in which a piston is accommodated at a tip opening side of a cylinder hole and a sleeve piston is accommodated at a bottom side of the cylinder hole, and an adjust nut and an adjust bolt are screwed between the sleeve piston and the piston. Is arranged, the adjust nut is engaged with the piston,
In a caliper body of a disc brake for a vehicle, the adjust bolt is urged toward the bottom of the cylinder hole by the elastic force of an adjust spring, and a clutch plate of the adjust bolt is clutch-engaged with a clutch hole of the sleeve piston. , the sleeve piston, the spring guide having a spring receiving portion, a spring receiving portion is arranged in the cylinder bore opening portion side of the clutch plate
The adjusting spring is contracted between the spring receiving portion and the clutch plate.

Further, in the second invention, the first invention is provided.
To control the rotation of the sleeve piston.
Non-rotating loop that spans between the piston and the bottom wall of the cylinder hole
It is characterized in that a retaining piece of a spring guide is engaged with the pin to prevent the detent pin from coming off.

[0010]

According to the above two constructions, the whole of the inserted components from the sleeve piston inserted into the cylinder hole to at least the adjustment bolt or the piston is unitized in advance by the spring guide.

According to the second aspect of the present invention, the rotation preventing pin is previously attached to the sleeve piston by the retaining piece of the spring guide.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

The disc brake 1 includes a caliper body 2
The hydraulic actuation mechanism 3 operated by the brake pedal
A caliper body 2 is provided with a parking brake provided with a mechanical operating mechanism 4 for a parking brake operated by a hand lever or a foot pedal.
Are supported movably in the disk axial direction via a pair of sliding pins (not shown).

The caliper body 2 has an operating portion 2a and a reaction portion 2b which are disposed on opposite sides of the disk rotor 5.
And a bridge portion 2c connecting the two over the outside of the disk rotor 5. A pair of friction pads 7, 7 sandwich the disk rotor 5 between the action portion 2a and the reaction portion 2b. And are arranged to face each other. A large-diameter cylinder hole 8 opening toward the disk rotor 5 is provided in the action portion 2a.
A bearing hole 9 perpendicular to the cylinder axis;
A connecting hole 10 having a small diameter connecting the bearing hole 9 and the bearing hole 9 is formed.

A cylindrical piston 11 with a bottom is accommodated at the tip opening side of the cylinder hole 8, and a stepped sleeve piston 12 is accommodated at the bottom side of the cylinder hole 8. An adjuster 13 is disposed between the pistons 11 and 12 so that the braking gap between the disk rotor 5 and the friction pad 7 can be constantly maintained at a constant interval by the adjuster 13.

[0016] The piston 11 is accommodated in the cylinder bore 8 by a bottom wall 11a to the disk rotor side, Piscataway
An adjust nut 14 of an adjuster 13 is provided on the inner central axis of the ton 11 . Adjust nut 1
4 is to attach the flange 14a of the head to the bottom wall 11 of the piston 11.
a, the rotation of the circlip 15 is restricted.
The spring force of the coil spring 17 contracted between the spring 11 and the bottom of the piston 11
It is urged in the 1a direction.

A hydraulic chamber 18 is defined between the cylinder hole 8 and the piston 11. The hydraulic chamber 18 is
The hydraulic operating mechanism 3 includes a union hole 19 for supplying the hydraulic fluid to the piston, and a blender hole 20 for discharging air mixed in the hydraulic fluid. 18 and a union hole 19.

The sleeve piston 12 has a large-diameter portion 12a provided in the hydraulic chamber 18 and a small-diameter portion 12b housed in the connecting hole 10 through the O-ring 21 in a liquid-tight manner. The rotation in the circumferential direction is restricted by the rotation preventing pin 22 which is bridged between the portion 12a and the bottom wall 2e of the cylinder hole 8. Inside the large-diameter portion 12a, a large-diameter clutch hole 12c opening to the piston side and a small-diameter fitting hole 12d following the large-diameter clutch hole 12c are formed. Are formed.

The adjuster 13 includes the adjust nut 14 and an adjust bolt 23 screwed to the nut 14. The adjusting bolt 23 includes a male screw 23a that is screwed into the adjusting nut 14 and a multi-thread screw;
It comprises a rear shaft 23b projecting from the adjust nut 14 toward the bottom of the cylinder hole 8, and a large-diameter clutch plate 23c integrally formed at an intermediate portion of the rear shaft 23b.
The rear end of the rear shaft 23b is fitted into the fitting hole 12d of the sleeve piston 12 via the sealing material 26, and the clutch plate 2
The outer tapered surface of 3c is engaged with the inner tapered surface of the clutch hole 12c.

The rear shaft 23 is provided outside the clutch plate 23c.
The bearing 24 and the bearing receiver 25 that are inserted into the bearing b are supported. Further, a cylindrical spring guide 27 is attached to the sleeve piston 12, and the spring guide 27 protrudes toward the disk rotor of the sleeve piston 12 and is connected to the rear shaft 2 of the adjustment bolt 23.
A stepped spring receiving portion 27a wrapping the outside of 3b is integrally formed. An adjusting spring 28 is contracted between the bearing receiver 25 and the spring receiving portion 27a, and the adjusting bolt 23 is urged toward the bottom of the cylinder hole 8 by the elastic force of the adjusting spring 28. The clutch engagement state between the clutch plate 23c and the clutch hole 12c is maintained.

The spring guide 27 has, in addition to the above-described spring receiving portion a27a, a bifurcated retaining piece 27b that bends along the bottom side surface of the cylinder hole of the sleeve piston 12. The detent pin 22 includes a large-diameter head 22a inserted into the pin hole 12f of the sleeve piston 12, and a shaft portion 22b inserted into the pin hole 2f of the bottom wall 2e of the cylinder hole 8.
The spring guide 27 and the detent pins 22, 22 are both attached to the sleeve piston 12 by being engaged with the base of the shaft portion 22b projecting from the pin hole 12f so as to sandwich the retaining piece 27b.

Also, by using the spring receiving portion 27a of the spring guide 27 and the retaining pieces 27b, 27b, at least the sleeve piston 12, the adjusting bolt 23, the bearing 24, and the bearing receiving member 2 are provided.
5, the adjusting spring 28 and the detent pin 22,
Up to 22 interpolation parts are unitized in advance as the minimum unit for assembling into the cylinder hole 8. Further, by screwing the adjustment nut 14 to the adjustment bolt 23, the whole of the inserted components up to the piston 11 can be integrated.

A camshaft 29 is provided in the bearing hole 9.
A push rod 31 is suspended between a cam groove 29 a of the cam shaft 29 and an engagement recess 12 e of the sleeve piston 12. A cam lever 32 is fixed to the protruding shaft portion 29b of the camshaft 29 by a fixing nut 33, and a coil-shaped return spring 34 is wound around the outer periphery of the fixing nut 33. The camshaft 29 and the cam lever 32 The torsion force of the return spring 34 constantly urges the non-operating direction.

A brake wire (not shown) connected to a hand lever or a foot pedal in the driver's seat is connected to the outer end of the cam lever 32, and the cam lever 32 is pulled into the caliper body 2 from the cam lever 32 pulled by the brake wire. The camshaft 29, the push rod 31, the sleeve piston 12, the adjusting bolt 23, and the adjusting nut 14, which are provided, constitute the mechanical operating mechanism 4 described above.

In a normal brake operation using the hydraulic operating mechanism 3, the hydraulic fluid pressurized to the hydraulic master cylinder by depressing the brake pedal is introduced into the hydraulic chamber 18 through the union hole 19, and the piston 11 is moved. By pushing in the direction of the disk rotor, one friction pad 7 is pressed against one side surface of the disk rotor 5. Next, the caliper body 2 moves in the direction of the action portion 2a by this reaction force,
The reaction force claw 2d presses the other friction pad 7 against the other side surface of the disk rotor 5 to perform a braking action.

In the parking brake operation by the mechanical operating mechanism 4, the brake wire is pulled by the hand lever or the foot pedal, and the cam lever 32 and the cam shaft 29 rotate integrally in the operating direction, and the push rod 31 is moved. Move toward disk rotor. The thrust converted to the push rod 31 is applied to the sleeve piston 1
2, transmitted to the piston 11 via the adjusting bolt 23 and the adjusting nut 14, and pushing the piston 11 toward the disk rotor to press the friction pads 7, 7 against the disk rotor 5 in the same manner as in the hydraulic operation. Thus, a braking action is performed.

In the above-described parking brake operation, the spring guide 27 for holding the adjustment spring 28 is used.
However, since the adjustment spring 28 moves integrally with the sleeve piston 12, no compression force acts on the adjustment spring 28, and the set load at the time of assembly is maintained.

When the braking gap between the disk rotor 5 and the friction pad 7 is within a predetermined range, the adjuster 13 does not perform the adjusting operation, only the piston 11 moves the backlash of the adjusting nut 14 and the adjusting bolt 23.

If the above-described braking gap becomes larger than the backlash amount due to repetition of braking, the piston 11 and the adjusting nut 14 are connected to the adjusting bolt 23 and the adjusting nut 14 during braking by the hydraulic operating mechanism 3. While filling in the backlash between them, it makes a large advance toward the disk rotor, and further moves the adjustment bolt 23 integrally in the direction of the disk rotor. Thereby, the clutch plate 23c separates from the clutch hole 12c against the elastic force of the adjusting spring 28, and the clutch engagement is released.

The adjusting bolt 23 having been disengaged from the clutch hole 12c is engaged with the adjusting spring 2.
Due to the resiliency of 8, the cylinder plate 8 is extended toward the bottom of the cylinder hole 8, and the clutch plate 23c is again engaged with the clutch hole 12c and stopped. As a result, the retracted positions of the piston 11 and the adjustment nut 14 whose braking has been released are changed to the disk rotor 5 side, and the disk rotor 5
A predetermined braking gap is automatically set between the friction pad 7 and the friction pad 7.

In this embodiment, as described above, the spring guide 27 mounted on the sleeve piston 12 is formed integrally with the spring receiving portion 27a and the retaining pieces 27b, 27b. At least the sleeve piston 12, the adjusting bolt 23, the bearing 24, the bearing receiver 2 among the components inserted into the cylinder hole 8 are formed by the retaining pieces 27b.
5, the adjusting spring 28 and the detent pin 22,
Or up to 22, walk the adjustment nut 14 and the piston 1
As a unit assembling the entire inner insertion portion articles comprising bets, so cut with Okuko transgression previously unitized integrally, the cylinder bore 8
The work of assembling the components can be greatly reduced. Also,
The processing of the groove for locking the circlip, which has conventionally prevented the spring retainer from coming off, can also be omitted.

Further, as an effect of assembling the detent pins 22, 22 to the sleeve piston 12 with the retaining pieces 27b, 27b, large press-fitting means and thread cutting can be dispensed with. Since the pin hole 12f of the sleeve piston 12 to be accommodated and the pin hole 2f of the cylinder hole bottom wall can be formed larger and rougher than the detent pin 22, assemblability can be improved, and tedious dimensional management is required. Absent.

In the conventional adjusting spring, one end is held by a spring retainer fixed to the caliper body side. In a parking brake operation using a mechanical operating mechanism, the adjusting spring is compressed by the forward movement of the sleeve piston. Therefore, the adjusting spring requires a length that allows for this compression. However, in the case of this embodiment, the adjusting spring 28 is not compressed by the forward movement of the sleeve piston 12, so that the spring length can be shortened. Combined with the omission of the circlip groove, the length of the caliper body 2 can be reduced, and the size and weight of the entire disc brake can be reduced.

In the present invention, a slit or a through hole may be formed in the detent pin to engage with the retaining piece of the spring guide. , Not necessarily required. Further, the spring guide can be attached to the sleeve piston other than the retaining piece.

[0035]

According to the present invention, the spring receiving portion of the spring guide makes it possible to previously integrate many of the insertion parts or most of the insertion parts into the cylinder hole, and to unitize them in advance. The work of assembling to the cylinder hole can be greatly reduced. Further, the processing of the circlip, which has conventionally prevented the spring retainer from coming off, and the groove for locking the circlip can be omitted.

In addition, a retaining piece is provided on the spring guide, and by using the retaining piece, a detent pin is previously attached to the sleeve piston. This eliminates the need for a large press-fitting means or thread cutting for mounting the detent pin. it can. Furthermore, since the pin hole in the bottom wall of the sleeve piston or cylinder hole that accommodates the detent pin can be formed larger and rougher than the detent pin, workability and assemblability can be improved, and troublesome dimensions can be improved. There is no need for management.

Further, since the spring guide is mounted on the sleeve piston, the adjusting spring is not compressed when the sleeve piston is moved forward, so that the length of the adjusting spring can be shortened, which is combined with the omission of the circlip groove. As a result, the length of the caliper body can be reduced, and the size and weight of the entire disc brake can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a disc brake showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a perspective view of a main part of an insertion part inserted into a cylinder hole.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Caliper body 2f ... Pin hole into which detent pin 22 is inserted 3 ... Hydraulic operating mechanism 4 ... Mechanical operating mechanism for parking brake 5 ... Disk rotor 7 ... Friction pad 8 ... Cylinder hole 9 ... Bearing Hole 10: small-diameter connecting hole connecting cylinder hole 8 and bearing hole 9 11: piston housed at the end opening side of cylinder hole 8 12: sleeve piston housed at the bottom side of cylinder hole 8 12c: clutch hole 12f: a pin hole into which the detent pin 22 is inserted 13: an adjuster 14: an adjust nut 18 ... a hydraulic chamber 19 ... a union hole 22: a detent pin 23 ... an adjust bolt 23a ... an external screw 23b of the adjust bolt 23 Rear shaft 23c: Clutch plate of adjust bolt 23 24: Bearing 25 Bearing support 27: Spring guide 27a mounted on sleeve piston 12 Spring receiving portion 27b of spring guide 27 Retaining piece 28 of spring guide 27 28: Shrinkage between bearing support 25 and spring receiving portion 27a of spring guide 27 Adjusting spring to be set

Claims (2)

(57) [Claims] 1. A piston is accommodated in a front end opening side of a cylinder hole and a sleeve piston is accommodated in a bottom side of the cylinder hole, and an adjust nut and an adjust bolt are screwed between the sleeve piston and the piston. The adjust nut is engaged with the piston, the adjust bolt is urged toward the bottom of the cylinder hole by the elastic force of the adjust spring, and the clutch plate of the adjust bolt is moved into the sleeve. In a caliper body of a disc brake for a vehicle in which a clutch is engaged with a clutch hole of a piston, a spring guide having a spring receiving portion is provided on the sleeve piston, and a spring receiving portion is arranged on a cylinder hole opening side of the clutch plate. Mounting, between the spring receiving portion and the clutch plate, A caliper body for a disc brake for a vehicle, wherein a cast spring is contracted. 2. A sleeve is accommodated in a cylinder hole at a tip end opening side and a sleeve piston is accommodated at a bottom side of the cylinder hole, and a detent pin is hung over the sleeve piston and a bottom wall of the cylinder hole. An adjuster in which an adjustment nut and an adjustment bolt are screwed is disposed between the sleeve piston and the piston to regulate rotation of the piston, and the adjustment nut is engaged with the piston to adjust the adjustment bolt. In a caliper body of a disc brake for a vehicle, which urges a clutch plate of the adjusting bolt to a clutch hole of the sleeve piston by urging the clutch plate of the adjust bolt to a clutch hole of the sleeve piston by an elastic force of a spring, the spring guide having a retainer piece and the spring receiving portion receives the spring Fitted so that part is disposed in the cylinder bore opening portion side of the clutch plate, between the Sprint <br/> grayed receiving portion and the clutch plate, while under compression the adjustment spring, one end of the locking pin A caliper body for a disc brake for a vehicle, characterized in that a lock pin is inserted into a pin hole of a sleeve piston, and the locking piece is engaged with the locking pin to prevent the locking pin from falling off.