JP2590988Y2 - Pin slide type vehicle disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin-slide type disc brake mounted on a vehicle such as a four-wheeled vehicle.
More particularly, the present invention relates to a disc brake having a structure using a pad retainer for moving a friction pad.

[0002]

2. Description of the Related Art A general form of a pin-slide type disk brake is a caliper in which a disk rotor is straddled by a bridge portion between caliper support arms arranged in parallel with the disk axis outside the disk rotor. The body is supported movably in the disk axis direction by a pair of sliding pins,
A lug projecting from both sides of a back plate of a friction pad disposed on both sides of a disk rotor is supported by a pad guide portion provided opposite to the caliper support arm via a pad retainer. It has been known.

The above-mentioned sliding pin is provided on one of a body mounting arm protruding from both sides of a caliper body and a caliper supporting arm, and a pin hole having a slightly larger diameter than the sliding pin is formed on the other. To allow the sliding pins to move smoothly.

In the above-mentioned pin slide type, since the caliper body is supported mainly by the engagement between the sliding pin and the pin hole, the caliper body is provided, for example, in Japanese Utility Model Laid-Open No. 63-12972.
In Japanese Patent Application Publication No. 8 (1996) -1995, the above-mentioned pad retainer is provided integrally with a pad pressing portion for pressing the lug of the friction pad in the inner circumferential direction of the disk to serve as a retainer / pad spring. By providing a resilient piece that presses the side surface on the exit side in the disk circumferential direction, the caliper body is repelled to the center position by both resilient pieces, so that when the vehicle travels on a rough road, the caliper body suddenly Even when a heavy load is applied, the abrupt movement of the caliper body is suppressed to ensure a smooth braking action.

[0005]

In such a configuration, even if the caliper body can be urged in the circumferential direction of the disk by a resilient piece, the rattling in the disk radial direction cannot be suppressed. For this reason, the caliper body
When the disc is rattled in the radial direction of the disc due to the vibration of the vehicle or the like, the pin hole is hit by the sliding pin, causing damage such as a dent inside the pin hole, which may hinder the smooth movement of the sliding pin. was there.

Further, since the friction pad is suppressed in the inner circumferential direction of the disk by the pad pressing portion, the slidability of the friction pad is impaired, and the lining is dragged by the disk rotor, causing uneven wear and sliding noise. Sometimes.

The present invention has been made in view of such a situation. The purpose of the present invention is to hold a caliper body on a pad retainer so that the caliper body can be moved in either the disk circumferential direction or the disk radial direction. A pin-sliding type disc brake for vehicles that prevents sliding and allows the sliding pin to move smoothly without giving a dent to the pin hole, and also prevents uneven wear and sliding noise of the friction pad. To provide.

[0008]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, according to the present invention, a pair of caliper support arms, which are arranged in parallel with the outside of a disk rotor in the disk axial direction, extend on a caliper bracket fixed to a vehicle body. the carry between the two caliper support arm
Straddle the bridge part of Pabody over the outside of the disk rotor
Of the caliper body continuous on both sides of the bridge
A working part and a reaction part are arranged on both sides of the disk rotor.
And countercurrent arrangement, while movably supporting the caliper body to the disk axis direction by the slide pins, the disc row
A pair of friction pads between the action section and the reaction section
The head is disposed, the lugs projecting back plate both sides of the friction pad, the pin slide type vehicular disk which supports through a pad retainer to the pad guide portion which is provided to face the two caliper support arms in the brake, or the bridge portion
Key portions of the caliper body extending from the caliper body to the working portion and the reaction portion.
A guide surface that is inclined inward in the disk radial direction of the caliper body is formed, and the pad retainer covers a retainer portion laid on the pad guide portion and a disk outer surface of the ear piece placed on the retainer portion. pad and floating preventing member, a caliper support piece having a spring force to the center outward of the caliper body is provided, the caliper support piece, anti create a working portion from the bridge portion to the disk axial direction
It is characterized in that it is formed to have a length extending over the use part and is pressed against each of the guide surfaces.

[0009]

[Function] The caliper body is located on the disc inlet and outlet sides.
The pressure contact between each guide surface and the caliper support piece, carry
The urging force is applied to the outside of the pabody in the center direction, so that the disc hardly rattles in the disc circumferential direction and the disc radial direction. Thus, the sliding pin is constantly pressed against the outer peripheral side or the inner peripheral side of the disk of the pin hole.

Further, the pad lifting preventing piece only covers the outer peripheral side surface of the ear piece to prevent the friction pad from floating, but does not have a resilient force in the disk inner circumferential direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

A disc brake 1 is provided on a caliper bracket 3 fixedly mounted on the vehicle body at one side of a disc rotor 2 rotating in the direction of arrow A. A pair of caliper supports are provided outside the disc rotor 2 side by side in the disc axis direction. Arms 3a, 3a are extended, and a pin slide type caliper body 4 that straddles the disk rotor 2 by a bridge portion 4d is disposed between the caliper support arms 3a, 3a.

The caliper support arms 3a have a U-shape extending at both ends so as to surround the disk rotor 2 on the inner peripheral side of the disk.
Are provided to face each other. At the center of the inner peripheral wall of the caliper support arm 3a, a rotor groove 3c for accommodating the disk rotor 2 is formed in a recess, and the pad guide portion 3b is divided into both side portions of the disk rotor 2 by the rotor groove 3c. Have been. A pin hole 3d is formed inside the caliper support arm 3a, and the caliper body 4 is
a, 4a, the sliding pins 5, 5 projecting from the
d and 3d so as to be movable in the disk axis direction.

The caliper body 4 has an operating portion 4b having the vehicle body mounting arms 4a, 4a on both sides, a reaction portion 4c provided opposite the operating portion 4b with the disk rotor 2 interposed therebetween, and a disk. And a bridge portion 4d connected across the outside of the rotor 2. A cylindrical piston 6 having a bottom is inserted in a cylinder hole 4e formed in the working portion 4b so as to open on the disk rotor side in a liquid-tight manner. The pressure fluid supplied to the chamber 7 causes the cylinder bore 4
e is moved toward the disk rotor.

Disk insertion side 4g of caliper body 4
And the disk feeding side surface 4h is moved from the bridge portion 4d to the working portion
4b and a surface in the disk axial direction across both ends of the reaction portion 4c.
Are formed on one, the disc once the entrance face 4g and the disk rotation exit side 4h, the disc radius of the caliper body 4
A guide surface 4i inclined inward in the direction is formed. The guide surface 4i is elastically contacted with a caliper support piece 11f of the pad retainer 11, which will be described later.
Since it moves in the disk axis direction while being supported by f, a smooth finish with little frictional resistance is provided.

A pair of friction pads 8, 8 are provided between the action portion 4b and the reaction portion 4c with the disk rotor 2 interposed therebetween. Each friction pad 8 is formed by joining a lining 9 that is in sliding contact with the disk rotor 2 and a back plate 10 held by the caliper support arm 3a, and ear pieces 10a, 10a project from both sides of the back plate 10. And friction pads 8, 8
The earpieces 10a, 10a are supported by the pad guides 3b, 3b via pad retainers 11 so as to be movable in the disk axial direction.

Each of the pad retainers 11 has a pair of L-shaped retainers 11a, 11a, and a pad lifting prevention piece 11 opposed to a seating surface of each retainer 11a.
b, 11b, a connecting piece 11c for connecting the elevations of the retainer portions 11a, 11a, and a lower portion of the center of the connecting piece 11c from below.
A latching piece 11d projecting obliquely to the opposite side to the retainer 11a, a spring 11e projecting in a U-shape from the upper central portion of the connecting piece 11c;
1e, the pad lifting preventing pieces 11b, 11
b and a caliper support piece 11f projecting obliquely above b.

The caliper supporting piece 11f is connected to the bridge 4d.
In the axial direction of the disc from the working portion 4b to the reaction portion 4c
And one of the caliper bodies 4 disposed on the action portion 4b side of the caliper body 4 is formed to be longer than the other, and the center of gravity of the caliper body 4 at the time of initial setting is located at the line B1 in FIG. As the lining 9 of the friction pad 8 wears, the caliper body 4 moves in the direction of the action portion 4b, and when the center of gravity of the caliper body 4 moves to the line B2 due to the full wear of the lining 9, The length protrudes toward the action portion 4b.

The above-described pad retainer 11 includes a connecting piece 11
c on the outside of the disk rotor 2, and
1a and 11a are laid on the separated pad guide portion 3c, the latching piece 11d is latched on the rotor groove 3c of the caliper support arm 3a, and the caliper support piece 11f is pressed against the guide surface 4g of the bridge portion 4d. Mounted. Further, the pad lifting preventing piece 11b is disposed in contact with the outer surface of the disc of the ear piece 10a supported by the pad guide part 3b via the retainer part 11a, or is disposed with a slight gap depending on the mounting described above. And earpieces 1
It only covers the outer surface of the disk 0a and does not have a resilient force on the friction pad 8 in the disk center direction.

The elastic force of both caliper support pieces 11f, 11f acts outward in the direction of the center of the caliper body 4 to center the caliper body 4 at an intermediate position between the caliper support arms 3a, 3a. And the sliding pins 5 and 5 integral with each other so as to be pressed outward in the disk radial direction . That is, the caliper body 4 is provided with the caliper support piece 1 in addition to the engagement between the slide pin 5 and the pin hole 3d.
It is also supported by 1f and 11f. The sliding pins 5 and 5 integrated with the caliper body 4 respectively have pin holes 3d.
The whole of the shaft portion inserted into the inside is always pressed against the disk outer peripheral side of the pin hole 3d (see FIG. 1).

The present embodiment is configured as described above, and when the hydraulic fluid is supplied to the hydraulic chamber 7 at the bottom of the cylinder hole,
The piston 6 advances in the cylinder hole 4e toward the disk rotor, and presses one friction pad 8 against one side surface of the disk rotor 2. Next, by this reaction, the caliper body 4 moves in the direction of the action portion 4b while being guided by the slide pins 5 and 5, and the reaction portion 4c presses the other friction pad 8 against the other side surface of the disk rotor 2, and A braking action is performed. The friction pads 8, 8 are subjected to a lifting force to the outside of the disk due to the sliding friction between the disk rotor 2 and the lining 9, but the pad lifting prevention piece 11b suppresses the outer side surface of the ear piece 10a to the disk. Deter.

Since the caliper body 4 is pushed up to the outside of the disk by the resilience of the caliper supporting pieces 11f, 11f provided on both pad retainers 11, 11, rattling due to running on a rough road or the like is suppressed. You. Also,
Even when the caliper body 4 at the time of braking moves in the disk axial direction as described above, the caliper support piece 11
f, 11f elastically hold the lower side of the bridge portion 4d to enhance stability. In particular, in this embodiment, the caliper support piece 11
f, 11f are formed from the bridge 4d in the disk axis direction.
The caliper supporting piece 11f is also formed on the caliper support piece 11f on the side of the caliper body 4b.
Has a sufficient length for the movement of the center of gravity of the friction pad 8, when the friction pad 8 is new, the center of gravity at the position of the line B1 moves to the line B2 due to the full wear of the pad 8, so that the caliper fluctuates. Since the center of gravity of the body 4 is always supported from below, the tilting of the caliper body 4 and the sliding pins 5, 5 is suppressed as much as possible, and a stable braking force can be exerted.

Also, the sliding pins 5 and 5 integral with the caliper body 4 are constantly pressed against the disk outer peripheral side of the pin holes 3d by the elastic force of the caliper supporting pieces 11f, 11f, so that not only the traveling vibration but also the sliding pins 5, 5 are generated. , Pin hole 3 when braking
Even when d slides, the sliding pin 5 does not hit the pin hole 3d and no dent is formed inside the pin hole, so that the sliding pin 5 can be slid smoothly.

Further, the pad lifting prevention piece 11b is
Since only the lifting of the friction pad 8 is suppressed and the friction pad 8 is not unnecessarily suppressed in the inner circumferential direction of the disk, the slidability of the friction pad 8 is improved, and the lining 9 is dragged to the disk rotor 2 to cause uneven wear and rubbing. No sound is produced.

In the type in which the sliding pin and the pin hole are provided on the caliper body and the caliper supporting arm in a reverse relationship to the above embodiment, the contact between the sliding pin and the pin hole is made on the inner circumferential side of the disk. There is no difference in effect.

[0026]

According to the present invention, rattling of the caliper body is suppressed by the resilience of the caliper supporting piece provided on the pad retainer. Also, when the caliper body moves in the disk axis direction during braking, the caliper support piece elastically holds the lower side of the bridge portion to enhance stability.

Further, the sliding pin for guiding the movement of the caliper body is always pressed against the outer peripheral side or the inner peripheral side of the pin hole by the resilient force of the caliper supporting piece, so that not only the traveling vibration but also the braking is applied. Even when the pin hole slides sometimes, the sliding pin does not hit the pin hole and no dent is formed inside the pin hole, so that the sliding pin can be slid smoothly.

Further, the caliper supporting piece of the pad retainer
From the bridge in the axial direction of the disc to the action and reaction
Of the caliper body
Moves in the direction of the working part with the wear of the rub pad, and the caliper
Even if the center of gravity of the body changes, the caliper support
Supports the center of gravity of the caliper body from the inside in the disc radial direction.
To minimize the tilt of the caliper body and sliding pin
As a result, a stable braking force can be exhibited. Furthermore,
Since the pad lifting preventing piece does not unnecessarily suppress the friction pad in the inner circumferential direction of the disk, the slidability of the friction pad is improved, and uneven wear of the lining and sliding noise are not generated.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of FIG.

FIG. 2 is a partial cross-sectional plan view of the disc brake showing one embodiment of the present invention.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a partial cross-sectional rear view of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a perspective view of a pad retainer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 3a ... Caliper support arm, 3b ... Pad guide part, 3c ... Rotor groove, 3d ... Pin hole, 4 ... Caliper body, 4a ... Body mounting arm, 4b ... Working part, 4c
... Reaction part, 4d ... Bridge part, 4g ... Bridge part 4d
4h ... the disk feeding side of the bridge portion 4d, 4i ... the tapered guide surface, 5 ... the sliding pin,
8: friction pad, 9: lining, 10: back plate, 10a
... Ear piece of back plate 10, 11 ... Pad retainer, 11a ... Retainer part, 11b ... Pad lifting prevention piece, 11c ...
Connecting piece, 11d: latching piece, 11e: spring part,
11f: Caliper support piece, A: Rotation direction of disk rotor 2, B1, B2: Center of gravity position of caliper body 5

Claims (1)

(57) [Scope of request for utility model registration] A caliper bracket fixed to a vehicle body is provided with a pair of caliper support arms extending in parallel with the outside of a disk rotor in a disk axial direction, and a bridge portion of the caliper body is provided between the caliper support arms. The disk rotor
On the outside of the bridge, and carry on both sides of the bridge
The working part and the reaction part of the pabody are
And opposed on both sides, while movably supporting the caliper body to the disk axis direction by the slide pins, the de
Between the action section and the reaction section with the disc rotor interposed therebetween.
A pin-sliding type vehicle in which a pair of friction pads is provided, and ear pieces projecting from both sides of a back plate of the friction pad are supported via pad retainers on pad guides provided opposite the caliper support arms. Disc brake for a vehicle, the carrier extending from the bridge portion to the action portion and the reaction portion.
Disc body side and disc side-out side of Pabody
Inclining inward in the radial direction of the disc of the caliper body
The pad retainer, a retainer portion laid on the pad guide portion, a pad lifting prevention piece covering the outer surface of the disc of the ear piece placed on the retainer portion, and the caliper A caliper supporting piece having a resilient force outward in the center direction of the body , and the caliper supporting piece is formed from the bridge portion in the disk axis direction.
A pin-sliding type disc brake for a vehicle , wherein said disc brake is formed to have a length extending over a working portion and a reaction portion and pressed against said guide surfaces.