JPH038814Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pin-slide type vehicle disc brake in which the movement of a caliper body is guided by a slide pin, and particularly relates to a support structure for the caliper body using the slide pin.

[Conventional technology]

A bracket fixed to the vehicle body is provided with a pair of support arms that straddle the disc rotor in the disc axial direction.
In the case of a pin-slide type disc brake, in which a slide pin protruding from the caliper body is inserted into the insertion hole of the support arm and the caliper body is guided in the disc axis direction for braking, the slide pin is inserted during idle running. Braking failure may occur due to uneven wear due to rattling or falling of the slide pin, so the outer periphery of the slide pin may be coated with rubber, or a pipe-shaped nut may be used as shown in Publication No. 62-42185. A slide pin is known in which a member is used as a base and synthetic resin is integrally molded around the outer periphery of the slide pin.In both technologies, a dust boot that protects the mouth of the insertion hole from dust protects each seal at the end. , is fitted and attached to the inner circumferential groove of the insertion hole opening and the outer circumferential groove of the slide pin protruding from the insertion hole.

[The problem that the idea attempts to solve]

However, despite the above-mentioned measures, in recent disc brakes, due to the increase in the size of the caliper body, the weight of the caliper body tends to increase relative to the bracket, and the slide pin length has inevitably become longer than before. Because it is necessary,
The slide pin became more inclined to fall, and the slide pin was likely to rattle, especially during idle running.

Therefore, the present invention was developed to include a seal in the dust boot seal.
It is an object of the present invention to provide a pin slide type disc brake for a vehicle that prevents rattling of the slide pin and provides a bushing effect to support the slide pin.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a bracket fixed to the vehicle body with a pair of support arms that straddle the outer periphery of the disc rotor, and inserts a pair of support arms into the insertion holes of each support arm. , a slide pin protruding from the carrier body is inserted to support the carrier body so as to be movable in the disk axial direction, and a dust boot is provided in the inner circumferential groove of the insertion hole opening and the outer circumferential groove of the slide pin protruding from the insertion hole. In a pin slide type vehicle disc brake in which seal portions at both ends are fitted, a gap is set between the insertion hole and the slide pin, and a bushing that slides through the insertion hole is fitted around the outer periphery of the tip of the slide pin. At the same time, a protrusion is formed on the inner periphery of the inner circumferential groove, and an annular groove that fits with the protrusion is formed on the outer periphery of one seal portion of the dust boot that is fitted in the inner circumferential groove. The seal portion is fitted into the inner circumferential groove, and the base side of the slide pin is supported by the seal portion.

[Effect]

With the above configuration, the slide pin is supported at its distal end and base side in the insertion hole by the bush and the seal portion of the dust boot.

Furthermore, although the seal portion of the dust boot fitted into the inner circumferential groove of the insertion hole opening receives sliding resistance from the slide pin, the sealing performance is maintained due to the fit between the protrusion and the annular groove.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the disc brake 1, support arms 2a, 2a integrally formed with a bracket 2 fixed to the vehicle body are disposed so as to straddle the outer periphery of a disc rotor 3 in the disc axial direction. , insert each slide pin 6 protruding from the mounting arms 4a, 4a with a bolt 5 into the insertion hole 2b of the support arm 2a,
A large-sized carrier body 4 is provided that is movably guided in the disk axial direction.

The above-mentioned carrier body 4 has an action part 4b having a cylinder hole 7 formed therein and a reaction part 4d having a reaction claw 4c connected by a bridge part 4e spanning the outer periphery of the disc rotor 3. 8 is inserted, and friction pads 9, 9 are arranged oppositely on both sides of the disc rotor 3.

Each friction pad 9 consists of a lining 10 that slides on the disc rotor 3 and a back plate 11 to which the lining 10 is fixed.A shim plate 12 is attached to the back of the back plate 11. Patsudo 9 is
Both hanging pieces 11a, 1 protruding from both sides of the back plate 11
1a is locked to each step 2c formed on the inside of the support arms 2a, 2a, and is suspended and supported by the bracket 2, and is also suspended from the ceiling opening 4 of the bridge portion 4e.
The disc is urged in the axial direction by the biasing force of the pad spring 13 that is locked at f.

The slide pin 6 is formed with a length sufficient to support the weight of the large carrier body 4, and a gap C is set between the insertion hole 2b and the slide pin 6. A bushing 14 that slides in the insertion hole 2b is fitted into the small diameter shaft portion 6a at the tip, and the bushing 14 is made of an elastic material such as an impregnated resin material with a low coefficient of friction.

Furthermore, the opening 2d of the insertion hole 2b is connected to the dust boot 1.
5, and the boot 15 has seal portions 15a and 15b at both ends inserted into the inner circumferential groove 2 of the insertion hole 2b.
e and the outer circumferential groove 6b of the slide pin 6 protruding from the insertion hole 2b, respectively.

The length l of the inner circumferential groove 2e is longer than that of the conventional groove, and at the center of the inner circumference, a protrusion 2f having an approximately triangular cross section with a chamfered top portion in an arc shape is formed.

Dust boot 15 fitted into the inner circumferential groove 2e
One of the seal portions 15a has a narrow triangular annular groove 15c in the center of the outer periphery that is fitted into the protrusion 2f.
is formed, and protrusions 15d, 15d are formed on the inner periphery of the seal portion 15a at positions on both sides sandwiching the annular groove 15c.
In this case, the annular groove 15c is fitted to the protrusion 2f to form the inner circumferential groove 2.
e, and the slide pin 6 is supported in the insertion hole 2d by the bushing 14 at the tip and the sealing part 15a at the base.

To explain this in more detail, the base side of the slide pin 6 is sandwiched between the protrusion 2f of the inner circumferential groove 2e and the annular groove 15c fitted to the protrusion 2f, and the seal portion 15a
These protrusions 2f, 15d, 15 are supported at three points by protrusions 15d, 15d provided on the inner circumference of the
d and the annular groove 15c, the opening 2d of the insertion hole 2b is sealed and dust-proofed, while also having a bushing action to support the slide pin 6. When the sealing part 15a is supported at three points as described above, , the compressive load can be concentrated on these three locations, the base side of the slide pin 6 can be effectively supported, and the bush 1 fitted on the tip can be
4, it is possible to suppress the fall of the slide pin 6 and prevent braking failure due to uneven wear of the slide pin 6.

Furthermore, since the slide pin 6 does not come into contact with the insertion hole 2b, rattling during idle running is prevented, and furthermore, the tilting of the slide pin 6 and manufacturing errors of each member are absorbed by the bush 14 and the seal portion 15a. ,
A smooth braking action can be achieved.

Further, although the seal portion 15a is subjected to sliding resistance with the slide pin 6, the fitting state between the protrusion 2f and the annular groove 15c can firmly maintain the fitted state with the inner circumferential groove 2e. The sealing performance of 2b is not impaired.

The seal portion 15a shown in the other embodiment of FIG.
An annular groove 15c fitted with the protrusion 2f of the inner circumferential groove 2e
However, the protrusions 15d provided on the inner circumference in the above embodiment,
15d is omitted, and the base side of the slide pin 6 is directly supported by the inner peripheral surface 15e of the seal portion 15a.

Note that the protrusion of the inner circumferential groove of the insertion hole and the annular groove of the dust boot that is fitted thereto may be formed in other shapes such as an arc shape other than the triangle shown in the above embodiment. The present invention is applicable not only to large, bulky caliper bodies, but also to disc brakes equipped with general caliper bodies.

[Effect of idea]

As explained above, the present invention sets a gap between the insertion hole formed in the support arm of the bracket and the slide pin of the caliper body that is inserted into the insertion hole, and the outer periphery of the tip of the slide pin. , a bush that slides in the insertion hole is fitted, and a protrusion is formed on the inner circumference of the inner circumferential groove, and the protrusion is formed on the outer circumference of one seal portion of the dust boot fitted in the inner circumferential groove. Since an annular groove that fits with the thread is formed and the seal portion is fitted into the inner circumferential groove, and the base side of the slide pin is supported by the seal portion, the slide pin has a distal end portion and a base side that are connected to the bushing. This prevents the slide pin from rattling during idle running, and also absorbs tilting of the slide pin and manufacturing errors of each member into the bushing and seal. , smooth braking action can be achieved.

In addition, although the seal portion is subjected to sliding resistance from the slide pin, the fitting state between the protrusion and the annular groove can be maintained so that sufficient sealing performance can be maintained.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a partially cutaway plan view of the disc brake.
Fig. 2 is a sectional view of Fig. 1 in the direction of the arrow, Fig. 3 is a sectional view of Fig. 2, Fig. 4 is an enlarged sectional view of the main part, and Fig. 5 is an enlarged main part showing another embodiment. FIG. 1... Disc brake, 2... Bracket,
2a... Support arm, 2b... Insertion hole, 2d... Mouth, 2e... Inner peripheral groove, 2f... Projection, 3... Disc rotor, 4... Caliper body, 6... Slide pin, 6a... Small diameter shaft portion, 6b...Outer peripheral groove, 9
... Friction pad, 14 ... Bush, 15 ... Dust boot, 15a, 15b ... Seal part, 15c
...Annular groove, 15d...Protrusion, 15e...Inner peripheral surface.

Claims (1)

[Scope of utility model registration request] A pair of support arms that straddle the outer periphery of the disc rotor are installed on a bracket fixed to the vehicle body, and a slide pin protruding from the carriparous body is inserted into the insertion hole of each support arm, allowing the cariper body to move in the disk axis direction. A pin slide type vehicle disk brake in which seals at both ends of the dust boot are fitted into an inner circumferential groove at the opening of the insertion hole and an outer circumferential groove of a slide pin protruding from the insertion hole. A gap is set between the slide pin and a bush that slides through the insertion hole is fitted to the outer periphery of the tip of the slide pin, and a protrusion is formed on the inner periphery of the inner periphery groove. forming an annular groove that fits with the protrusion on the outer periphery of one seal portion of the dust boot that fits into the groove, and fits the seal portion into the inner circumferential groove;
A pin slide type disc brake for a vehicle, characterized in that a base side of a slide pin is supported by the seal portion.