JP3103950B2 - Caliper support structure for pin slide type vehicle disk 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 used for various traveling vehicles such as automobiles and motorcycles. More specifically, the present invention relates to a bracket on the vehicle body side and a pair of sliding brackets. It relates to a structure with a caliper supported via a pin.

[0002]

2. Description of the Related Art A pin slide type disc brake used in a vehicle such as an automobile has a caliper structure in which a working portion and a reaction portion, which are disposed on opposite sides of a disc rotor, are connected by a bridge portion straddling the outside of the disc rotor. Sliding pins protrude from one of the disc entry and exit sides of the action section, or one of the caliper support arms extending from the bracket attached to the vehicle body to both sides of the bridge section, These sliding pins are inserted through insertion holes formed on the other side to support the caliper so as to be movable in the disk axial direction (for example, see Japanese Utility Model Laid-Open No. 3-31428).

[0003]

In such a pin-slide type disc brake, a piston is mounted in a cylinder hole formed in an action portion, and hydraulic fluid is supplied to a hydraulic chamber at the bottom of the cylinder hole. Further, since the above-described sliding pin and the mounting arm for the insertion hole are provided in the working portion, the weight of the working portion increases, and the caliper weight is closer to the working portion side than in the reaction portion side having only the reaction claw. It is significantly biased.

Further, when the lining of the friction pad wears due to repeated braking, the caliper gradually adjusts from the initial setting position to the working portion, so that the weight difference between the working portion and the reaction portion further increases. In addition, the insertion length of the sliding pin that supports the weight of the caliper gradually decreases, and the sliding pin becomes loose and easily tilts in the insertion hole, preventing smooth movement of the caliper in the disk axis direction. In addition, there is a problem that the caliper tilts largely in the direction in which the disc is ejected during braking, causing uneven wear to the friction pad.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a caliper support capable of performing stable braking from initial setting of a friction pad to full wear. It is to provide a structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a method of connecting a working portion and a reaction portion, which are disposed on opposite sides of a disk rotor, with a bridge portion straddling the outside of the disk rotor. A pin-sliding type disc brake for a vehicle, wherein the caliper is supported by calipers supporting arms provided on both sides of the bridge portion so as to be movable in a disc axial direction via a pair of sliding pins. , The sliding pin is protruded from one of the reaction portion and the caliper support arm, the other is formed with the insertion hole, and the sliding pin is inserted through the insertion hole. And

[0007]

According to this structure, a part of the weight of the working portion is transferred to the reaction portion, so that the bias of the caliper weight is corrected. Also, when the caliper is adjusted in the direction of the action due to the lining wear, the sliding pin moves in the insertion direction of the insertion hole along with the adjustment of the caliper, and the insertion length of the sliding pin is at least constant. It is kept or increased and not decreased as before.

[0008]

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

A caliper 2 used for the disc brake 1 has an action portion 2a and a reaction portion 2 which are arranged on both sides of the disc rotor 3 which rotates integrally with the wheels.
b and a bridge portion 2c connecting these over the outside of the disk rotor 3. In the action part 2a,
A cylinder hole 5 for accommodating the piston 4 is provided, and a reaction claw 2d is formed integrally with the reaction portion 2b. Attachment arms 2e,
A sliding pin 6 is fixed to each of the mounting arms 2e, 2e with a mounting bolt 7 with its tip directed toward the action portion 2a.

A bracket 8 for supporting the caliper 2 is fixed to a vehicle body (not shown) at one side of the disk rotor 3 on which the above-described working portion 2a is disposed. The bracket 8 has a pair of caliper support arms 8a, 8a extending across the outside of the disk rotor 3 and slightly sandwiching the bridge portion 2c. The caliper support arms 8a, 8a are provided with bag-shaped protrusions 8b, 8b extending along the side of the action portion 2a from positions close to both sides of the bridge 2c, and the other side of the disk rotor 3. The side is a U-shaped tie bar 8c
It is connected by. Each of the bag-shaped protrusions 8b has a reaction portion 2
There is an insertion hole 8d opening to the b side, and the above-described caliper 2 is provided.
The slide pins 6, 6 protruding from the reaction portion 2b are inserted into these insertion holes 8d, 8d, and are supported so as to be movable in the disk axial direction.

A pair of friction pads 9 and 9 are arranged between the action portion 2a and the reaction portion 2b so as to face each other with the disk rotor 3 interposed therebetween. Each friction pad 9 is composed of a lining 9 a that comes into sliding contact with the disk rotor 3 and a back plate 9 b that is held by the bracket 8. Ear pieces 9c, 9c protrude from both sides of the back plate 9b.
Is used to attach the ear pieces 9c, 9c to the caliper support arms 8a, 8a.
Similarly to the caliper 2, it is movably suspended in the disk axial direction by being inserted into pad guide grooves 8e, 8e provided to face each other with the disk rotor 3 interposed therebetween.

The insertion hole 8d is formed at the tip end of the sliding pin 6 at the time of initial setting with a length at least equal to the thickness of one lining 9a, and when the lining 9a is fully worn. Also, the tip of the sliding pin 6 is prevented from hitting the bottom of the insertion hole 8d. Further, in the caliper 2 of the present embodiment, the sliding pin, which has been located on the operation portion side with the conventional caliper, is moved to the reaction portion 2b side, so that the weight is reduced on the operation portion 2a side, and the reaction portion is reduced. 2
The weight increases on the b side so that the balance between the two approaches as close as possible, and the center of gravity G1 of the conventional caliper is
If it is at the position shown in FIG. 1, the center of gravity G2 of the caliper 2 of this embodiment is changed to a position closer to the disk rotor 3 side.

This embodiment is configured as described above.
When the pressurized hydraulic fluid is supplied to the hydraulic chamber 5a defined at the bottom of the cylinder hole 5, the piston 4
, The friction pad 9 on the side of the action portion 2a is pushed and the lining 9a of the pad 9 is
To one side. Next, due to this reaction, the caliper 2 moves in the direction of the action portion 2a, and the reaction force claw 2d pushes the friction pad 9 on the reaction portion 2b side, and the lining 9 of the pad 9 is moved.
a is pressed against the other side of the disk rotor 3.

The caliper 2 which moves in the disk axis direction by the above-described braking action has the sliding pins 6 and 6 provided on the reaction portion 2b, and the center of gravity G2 is moved toward the disk rotor 3 side. The weight balance between the action portion 2a and the reaction portion 2b is better than before, and the tilting of the drag torque from the disk rotor 3 is suppressed as much as possible, so that the movement in the disk axial direction can be performed smoothly, and a stable braking force is obtained. And the uneven wear of the lining 9a due to the tilting is suppressed.

When the lining 9a wears due to the repetition of the braking action, the caliper 2 moves the sliding pins 6 and
6 and is adjusted in the direction of the action portion 2a. This amount of adjustment corresponds to the amount of wear of the lining 9a on the reaction portion 2b side. In the caliper 2, the center of gravity G2 moves toward the action portion 2a as the wear progresses. It is gradually inserted deep into 8d.

When the caliper 2 is adjusted toward the action portion 2a, the center of gravity G2 is adjusted to the lining 9 on the reaction portion 2b side.
a, the caliper gradually moves away from the disk rotor 3 and the weight of the caliper is biased toward the action portion 2a.
The slide pins 6, 6 are inserted deep into the insertion hole 8d in conjunction with the adjustment of the caliper 2, and the insertion length gradually increases. Even if the weight moves to the action section 2a side,
The sliding pins 6 and 6 do not stick to the inside of the insertion hole 8d, so that the caliper 2 is securely held and prevented from falling down to the action portion 2a side.

It is preferable that the insertion hole into which the sliding pin is inserted is formed in a bag shape as in the above-described embodiment, so that intrusion of dust and the like can be prevented. May be penetrated. This is because the caliper center of gravity is closer to the disk rotor than the conventional one, the weight difference between the working part and the reaction part becomes smaller, and even when the caliper is adjusted in the direction of the working part, the insertion length of the sliding pin is reduced. This is because a certain amount of insertion is secured without decreasing.

Further, in the present invention, contrary to the above-described embodiment, a slide pin may protrude from the caliper support arm, and an insertion hole may be formed in the reaction portion of the caliper.

[0019]

The caliper support structure according to the present invention is
A slide pin is protruded from one of the caliper reaction portion and the caliper support arm on both sides of the bridge portion, an insertion hole is formed in the other, and the slide pin is inserted into the insertion hole, and the caliper is inserted into the disk shaft. Direction, the difference in weight between the acting part and the reaction part becomes smaller than before, and the tilting of the drag torque from the disk rotor is suppressed as much as possible. As a result, stable braking force can be exhibited, and uneven wear of the lining due to tilting can be suppressed.

Further, even when the caliper is adjusted in the direction of the working portion as the lining wears, the insertion length of the sliding pin is kept at least constant or increases. As before, the sliding pin does not rattle in the insertion hole and the caliper does not fall down to the action part side due to uneven load, and the initial setting of the friction pad installation until the lining is fully worn For a long period of time.

[Brief description of the drawings]

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

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a partial cross-sectional rear view of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

[Explanation of symbols]

1. Disc brake, 2. Caliper, 2a Working part,
2b: reaction portion, 2c: bridge portion, 2e: mounting arm,
3 ... Disc rotor, 4 ... Piston, 5 ... Cylinder hole,
6: sliding pin, 7: mounting bolt, 8: bracket, 8
a: caliper support arm, 8b: bag-shaped protrusion formed on caliper support arm 8a, 8c: tie bar, 8d: insertion hole into which sliding pin 6 is inserted, 9: friction pad, 9a: lining, 9b: back Plate, G1 ... the center of gravity of the conventional caliper, G
2. Position of the center of gravity of the caliper 2 of this embodiment

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 49/00-71/04

Claims (1)

(57) [Claims] 1. A caliper is formed by connecting a working portion and a reaction portion opposed to both sides of a disk rotor with a bridge portion straddling the outside of the disk rotor, and forming the caliper on both sides of the bridge portion. In a pin-sliding type vehicle disk brake in which a caliper supporting arm disposed on a vehicle is movably supported in a disk axial direction via a pair of sliding pins, the sliding pin is provided with the reaction portion and the caliper supporting arm. A caliper support structure for a pin-sliding type vehicle disk brake, characterized in that the caliper support structure is provided so as to protrude on one of the two sides and form an insertion hole on the other side, and the sliding pin is inserted through the insertion hole.