JPH082504Y2 - Pin slide type vehicle disc brake - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pin slide type vehicle disc brake mounted in an automobile or a motorcycle, and more specifically, to a slide pin for guiding a caliper body. Regarding the retainer to be worn.

[Conventional technology]

In the pin slide type disc brake, the slide pin protruding from the caliper body vibrates inside the insertion hole formed in the support arm of the caliper bracket, or the slide pin hits the insertion hole to generate a tapping sound. Therefore, as disclosed in Japanese Utility Model Laid-Open No. 1-150230, for example, a tubular bush that slides in the insertion hole is fitted to the tip end side of the slide pin.

[Problems to be solved by the device]

However, since this bush is made of an elastic material such as rubber and has a larger diameter than the insertion hole, it is difficult to assemble the slide pin when inserting it into the insertion hole, and after the assembly,
It causes a large sliding resistance against the slide pin, hinders smooth movement of the caliper body, and the friction pad cannot be sufficiently separated from the disc rotor during non-braking, which causes abnormal wear of the friction pad. . Further, although the fitting is tight at the beginning of the assembling, the elastic bush is liable to be worn or worn out as the use is advanced.

The present invention has been made against such a background, and the purpose thereof is to provide a disc brake that is smooth and has excellent durability while suppressing the sound and vibration of the slide pin. To do.

[Means for solving the problem]

According to the above-mentioned object, the first invention supports the caliper body movably in the disc axial direction by inserting the slide pin protruding from the caliper body into the insertion hole formed in the support arm of the caliper bracket. In a pin slide type vehicle disc brake, an engaging hole is formed in the outer periphery on the tip end side of the slide pin, and a plurality of elastic leg pieces arranged in the circumferential direction are inflated to the outer peripheral side in a curved shape to form an outer curved portion. In addition, insert a retainer formed by connecting the base ends of each elastic leg piece from the tip side of the slide pin, and fit the tip of each elastic leg piece into the engaging hole to attach it to the slide pin. Then
The outer curved portion of the elastic leg piece is elastically contacted with the inner peripheral surface of the insertion hole.

In the second invention, a gap smaller than the pin clearance between the slide pin and the insertion hole is set between the engagement hole of the slide pin described in the first invention and the tip of the elastic leg piece.

[Action]

According to this structure, the slide pin is elastically held at the tip end side by the retainer so as to be separated from the insertion hole, and the retainer can prevent the vibration and the tapping sound from being generated.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In the disc brake 1, a pair of support arms 3a, 3a straddling the outer periphery of the disc rotor 2 are provided on a caliper bracket 3 fixed to the vehicle body on one side of the disc rotor 2, and the support arms 3a, 3a In between, the caliper body 4 is movably supported in the disc axial direction by inserting the slide pins 5 projecting from the mounting arms 4a, 4a on both sides into the insertion holes 3b of the support arm 3a. .

The caliper body 4 is composed of an action portion 4b and a reaction portion 4c arranged on both sides of the disc rotor 2, and a bridge portion 4d connecting these portions over the outer circumference of the disc rotor 2, and the mounting arms 4a, 4a. Are provided so as to project on both sides of the action portion 4b. The cylinder hole 6 provided on the action portion 4b by opening the disc rotor side has a cup-like shape that moves liquid-tight in the disc rotor direction by the pressure liquid supplied to the hydraulic chamber defined on the bottom portion. Piston 7 is inserted,
Friction pads 8 are arranged opposite to each other on both sides of the disc rotor 2.

Each of the friction pads 8 is constructed by fixing a lining 9 which is in sliding contact with the disc rotor 2 to a back plate 10, and these friction pads 8 and 8 support hanging pieces 10a protruding from both sides of the back plate 10 respectively. It is locked by a locking step portion (not shown) formed inside the arm 3a, is hung on both sides of the disk rotor 2 so as to be movable in the disk axial direction, and is locked inside the bridge portion 4d. The urging force of the pad spring 11 causes the disk to repel.

The base 5a of the slide pin 5 is attached to the bolt 12
The shaft portion 5b fixed to the mounting arm 4a and inserted through the insertion hole 3b is formed to have a slightly smaller diameter than the insertion hole 3b.
An engagement hole 5c is circumferentially recessed at the tip end side of the shaft portion 5b, and a head portion 5d is formed at the tip end of the engagement hole 5c so as to have a smaller diameter than the shaft portion 5b. The shaft portion 5b has a portion protruding from the insertion hole 3b,
Covered with boot 13b that is integral with annular seal 13a
The base end side inside 3b is held by the annular seal 13a fitted inside the opening of the insertion hole 3b, and the tip end side is held by the retainer 14.

The retainer 14 includes four elastic leg pieces 14a arranged in the circumferential direction.
Is formed by connecting the base end of the plate to the end plate 14d, and the whole is made of a metal plate such as a stainless thin plate or a spring plate.

Each elastic leg piece 14a has a continuous corrugated outer curved portion 14b that curves toward the outer peripheral side on the proximal end side, and an inner curved portion 14c that curves on the distal end side toward the inner side, and the top portion of the outer curved portion 14b has the insertion hole 3b. The diameter of the inner curved surface is slightly larger than the inner peripheral surface of the
The diameter is smaller than that of the head portion 5d.

In the retainer 14 thus formed, the inner curved portion 14c is inserted from the head 5d side into the slide pin 5 before being inserted into the insertion hole 3b, and the head 5d is covered with the outer curved portion 14b. The inner curved portion 14c is fitted into the engagement hole 5c and mounted on the slide pin 5.

In this way, when the shaft portion 5b of the slide pin 5 with the retainer 14 attached is inserted into the insertion hole 3b, the elastic leg piece 14a enters while being narrowed to a small diameter at the opening portion of the insertion hole 3b, and bends outward. The portion 14b is pressed against the inner peripheral surface of the insertion hole 3b and the inner curved portion 14c is pressed against the engaging hole 5c with elastic force, respectively, and the shaft portion 5b
The tip side of the is separated from the insertion hole 3b and is elastically held.

The present embodiment is configured as described above, and when the hydraulic fluid is supplied to the hydraulic chamber at the bottom of the cylinder hole, the piston 7 advances through the cylinder hole 6 and the one friction pad 8 is moved to the disc rotor 2 Then, the caliper body 4 is moved to the acting portion 4b side by this reaction, and the reaction portion
4c presses the other friction pad 8 against the other side surface of the disc rotor 2 to perform a braking action.

Further, the slide pins 5, 5 move integrally with the caliper body 4 during the above-described operation, and the outer curved portion 14b of the elastic leg piece 14a slides through the insertion hole 3b. Since the outer curved portion 14b slides on the inner periphery of the insertion hole 3b by intermittent line contact, the sliding resistance is suppressed to be extremely small, the caliper body 4 can be smoothly moved, and the friction pad 8 Premature wear and uneven distribution due to dragging are eliminated.

Further, since the outer curved portion 14b of the elastic leg piece 14a also has sufficient rigidity to rub against the insertion hole 3b, it has excellent durability with little wear even for long-term use, and the shaft portion 5b
Since the inner curved portion 14c elastically holds the tip end side of the slide pin 5 even when the slide pin 5 tilts integrally with the caliper body 4, it does not hit the insertion hole 3b, and a tapping sound due to vibration is prevented.

In the second embodiment shown in FIG. 4, a gap C ₁ is provided between the inner curved portion 14c of the retainer 14 mounted on the slide pin 5 and the engagement hole 5c. This clearance C ₁ is set to be smaller than the pin clearance C ₂ between the insertion hole 3b and the shaft portion 5b of the slide pin 5, further reducing the sliding resistance of the slide pin 5 and the pin clearance C ₂ The tolerance of can be rough.

FIG. 5 shows a third embodiment of the present invention. A circular hole 14e is formed in the end plate 14d of the retainer 14 formed as in the first embodiment, and the head 5d of the slide pin 5 is formed. Is a cylindrical protrusion
5e is provided, and when the retainer 14 is mounted on the slide pin 5, the protrusion 5e is fitted into the circular hole 14e to retain the retainer 14 when sliding.
May receive an unbalanced load from the slide pin 5,
The slide pin 5 can be securely held without falling down easily.

The retainer of the present invention may have any shape as long as the distal end side of the elastic leg piece is squeezed more than the bulge toward the outer peripheral side so that it can be engaged with the engaging hole of the slide pin. The shape is not limited to the one that is warped. Further, the engagement hole shape of the slide pin is not limited to the circumferential shape as in the embodiment, but may be an independent hole with which each tip of the elastic leg piece engages.

[Effects of the Invention] The vehicle disc brake of the present invention has the engaging hole formed in the outer periphery on the tip side of the slide pin, and the plurality of elastic leg pieces arranged in the circumferential direction are inflated to the outer periphery in a curved shape to the outside. A retainer that forms a curved portion and is formed by connecting the base ends of the elastic leg pieces is inserted from the tip side of the slide pin, and the tip ends of the elastic leg pieces are fitted into the engaging holes. Since it is attached to the slide pin and the outer curved portion of the elastic leg piece is elastically contacted with the inner peripheral surface of the insertion hole, the retainer can be easily attached with one touch. Further, the sliding resistance of the slide pin is suppressed to an extremely small value, the caliper body can be moved smoothly, and the friction pad is prevented from premature wear and uneven distribution due to dragging.

In addition, the retainer itself also has sufficient rigidity for the elastic leg pieces to rub against the insertion hole, so it has excellent durability with little wear even for long-term use, and the tip of the elastic leg piece is a slide pin. Since the tip side is held elastically, generation of hammering sound due to vibration is prevented.

In addition, by setting a gap smaller than the pin clearance between the slide pin and the insertion hole between the engagement hole of the slide pin and the tip of the elastic leg piece, it is possible to prevent the slide pin from falling and hitting sound. The sliding resistance can be further reduced and the pin clearance tolerance can be made rough.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a plan view showing a disc brake with a part cut away, FIG. 2 is a sectional view of an essential part, and FIG. 3 is a retainer. FIG. 4 is a perspective view, FIG. 4 is a sectional view of a main part of the second embodiment, and FIG. 5 is a sectional view of a main part of the third embodiment. 1 ... Disc brake, 2 ... Disc rotor, 3 ...
... Caliper bracket, 3a ... Support arm, 3b ... Insertion hole for slide pin 5 to be inserted, 4 ... Caliper body, 4a
…… Mounting arm, 5 …… Slide pin, 5a …… Base, 5b…
... Shaft, 5c ... Circular engagement hole, 5d ... Head, 5e ... Projection, 8 ... Friction pad, 14 ... Retainer, 14a ... Elastic leg piece, 14b ... Outer curved part , 14c …… Inner curved part, 14d…
… End plate, 14e… Circular hole, C ₁ … Gap, C ₂ … Pin clearance

Claims (2)

[Scope of utility model registration request] 1. A pin slide type vehicle in which a slide pin protruding from a caliper body is inserted into an insertion hole formed in a support arm of a caliper bracket to support the caliper body so as to be movable in the disc axial direction. In the disc brake, engaging holes are provided in the outer periphery of the tip end side of the slide pin, and a plurality of elastic leg pieces arranged in the circumferential direction are inflated to the outer peripheral side in a curved shape to form an outer curved portion, and each elastic leg is formed. A retainer formed by connecting the base ends of the strips is inserted from the tip side of the slide pin, and the tip of each elastic leg piece is fitted into the engagement hole and mounted on the slide pin, and the insertion hole is formed. A disc brake for a pin slide type vehicle, wherein an outer curved portion of an elastic leg piece is elastically contacted with an inner peripheral surface of the. 2. A gap is set between the engagement hole of the slide pin and the tip of the elastic leg piece, and the gap is set smaller than the pin clearance between the slide pin and the insertion hole. The pin slide type vehicle disc brake according to claim 1.