JPH0610239Y2 - Sliding pin mounting structure of disc brake for pin slide type vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pin slide type disk brake for a vehicle in which a caliper is guided in the disk axial direction by a sliding pin, and in particular, as a rotation stop for the sliding pin. The present invention relates to a mounting structure of a sliding pin that can perform air bleeding in an insertion hole.

[Conventional technology]

A conventional example of this type of disc brake in which the movement of the caliper during braking is guided by a sliding pin is, for example, Japanese Utility Model Publication No. 56-
Some are disclosed in Japanese Patent No. 35546.

In this technology, a sliding pin is projected on either one of a bracket fixed to the vehicle body and a caliper that is arranged straddling the outer circumference of the disc rotor, and the sliding pin is inserted into an insertion hole formed in the other. Then, the caliper is movably supported in the disc axial direction. In the embodiment, the insertion hole is formed in the bracket, and the sliding pin is fixed to the caliper with a bolt or a nut.

[Problems to be solved by the device]

However, when the sliding pin is screwed with bolts or nuts, the sliding pin rotates together with these, so it is necessary to have a double chamfer or a hexagonal part for hanging the tool at the base of the sliding pin. Also, the screwing work was troublesome, requiring tools in both hands.

Also, when the sliding pin is inserted into the insertion hole for initial setting, the air in the insertion hole is difficult to be discharged, and the internal air acts as a resistance to the sliding pin, which hinders smooth assembly. There was a chance

The present invention has been made against the background of such circumstances, and prevents the co-rotation of the sliding pin, quickly discharges the air in the insertion hole, and makes it easy to assemble the sliding pin. It is an object to provide a sliding pin mounting structure for a disc brake.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a sliding pin on one of a bracket fixed to a vehicle body and a caliper arranged across a disc rotor, and an insertion hole on the other side. In a pin slide type vehicle disc brake in which the caliper is movably supported in the disc axial direction by a sliding pin that slides in the insertion hole, an axial guide groove is provided over the entire length in the insertion hole. The bush is press-fitted and fixed, and a protrusion having a smaller cross-sectional area than the guide groove is formed on the outer periphery of the slide pin, and the slide pin is inserted into the bush by engaging the protrusion with the guide groove. A ventilation gap is provided between the guide groove and the protrusion.

[Action]

With the above structure, the sliding pin is inserted in the bush to some extent in advance, the protrusion is engaged with the guide groove, and the bolt or the nut is screwed to fix the sliding pin to the bracket or the caliper.

Further, when the fixed sliding pin is inserted into the bush, the air in the insertion hole is replaced with this, and the air is discharged to the outside from the gap between the guide groove and the protrusion.

〔Example〕

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

In the pin slide type disc brake 1, a bracket 2 fixed to the vehicle body is arranged on the outer periphery of a disc rotor 3 that rotates with wheels, and is inserted into each of the insertion holes 2b formed in the support arms 2a on both sides. , The sliding pins 4 are respectively inserted, and the calipers 5 arranged across the disc rotor 3 are supported by the sliding pins 4 and 4 so as to be movable in the disc axial direction. It is braked by the sandwiching pressure of the friction pads 6 and 7 which are pushed by the caliper 5.

The caliper 5 includes an operating portion 5a on the side where a hydraulic piston (not shown) is arranged and an operating portion 5 with the disc rotor 3 interposed therebetween.
a reaction portion 5b facing a, and a bridge portion 5c connecting the reaction portion 5b across the outer circumference of the disc rotor 3,
Mounting arms 5d and 5d are provided on both sides of the action portion 5a so that the sliding pins 4 are fixed to the respective mounting arms 5d.

Each sliding pin 4 has a female screw hole 4c formed in a base end surface 4d on the mounting side where a large-diameter base portion 4a is formed, and the base end surface 4b is brought into contact with one side surface of the mounting arm 5d. A bolt 8 inserted into the through hole 5e from the other side is screwed into the female screw hole 4c and fixed to the mounting arm 5d. An axial protrusion 4e is provided on the outer periphery of the shaft portion 4d. It is provided from 4a to the vicinity of the tip of the shaft portion 4d.

A bush 9 having a C-shaped cross section having a slit-shaped guide groove 9a provided over the entire length is press-fitted and fixed in each of the insertion holes 2b, and the protrusion 4e of the sliding pin 4 is engaged with the guide groove 9a. The bushing 9 has the sliding pin 4 inserted therein.
e is formed to have the same height as the thickness of the bush 9 and the same width as the guide groove 9a, but since the end surface of the bush 9 forming the groove 9a is chamfered in an arc shape, the protrusion 4e is guided. A ventilation gap 10 is formed between the guide groove 9a and the protrusion 4e of the sliding pin 4 which is smaller than the cross-sectional area of the groove 9a and is inserted into the bush 9.

The guide groove 9a and the ridge 4e are provided to prevent the co-rotation of the bolt 8 when screwed by the screw 8 when the sliding pin 4 is mounted.
When the ridge 4e is engaged with the guide groove 9a by inserting the ridge 4e into the guide groove 9a to some extent, the ridge 4e and the guide groove 9a are not locked even if a force co-rotating with the sliding pin 4 is generated by tightening the bolt 8. Engagement results in circumferential positioning and co-rotation is prevented.

Therefore, when tightening the bolt, the operation of holding the sliding pin 4 with a tool is not required, and the mounting can be easily performed.
Since there is no need for a tooling process and a meat part for tooling,
The manufacturability can be improved, the weight can be reduced, and the cost can be reduced.

In addition, the gap 1 formed between the guide groove 9a and the protrusion 4e.
When the sliding pin 4 fixed to the caliper 5 is inserted into the bush 9 as described above, the air in the insertion hole 2b is discharged to the outside to facilitate the insertion, and at the time of braking the bush. The sliding of the sliding pin 4 that slides in and out 9 can be performed smoothly, and the caliper 5 can be operated smoothly.

FIGS. 4 and 5 are second and third embodiments of the present invention, respectively, and the protrusion 4f of the sliding pin 4 shown in the second embodiment of FIG.
Is the same width as the guide groove 9a and lower than the thickness of the bush 9, and the protrusion 4g of the third embodiment shown in FIG. 5 has the same height as the thickness of the bush 9 and is narrower than the guide groove 9a. The relatively large gaps 11 and 12 are formed on the outer peripheral sides or side portions of the ridges 4f and 4g, respectively, and the ventilation performance is further improved as compared with the first embodiment.

Further, by applying rubber or resin coating to the inner surface of the bush 9, it is possible to prevent the tapping sound from being generated by the sliding pin 4.

The protrusion formed on the sliding pin may be, for example, a protrusion provided on the tip side of the shaft portion or a plurality of protrusions that are intermittently provided in a row, in addition to the protrusions shown in the above embodiment. May be

[Effect of device]

As described above, according to the present invention, a bush provided with an axial guide groove over the entire length is press-fitted into an insertion hole formed in one of a bracket and a caliper, and a sliding pin protruding in the other is inserted. A protrusion having a smaller cross-sectional area than the guide groove is formed on the outer periphery of the guide groove, the protrusion is engaged with the guide groove, and the sliding pin is inserted into the bush to provide ventilation between the guide groove and the protrusion. Since the gap is formed, the guide pin and the protrusion are engaged with each other in the circumferential direction so that the sliding pin does not rotate even when screwed by a bolt or a nut, and can be easily mounted.

Therefore, it is not necessary to hold the sliding pin and hook the tool with the tool at the time of mounting, so that the mountability and the manufacturability can be improved, and the weight and the cost can be reduced.

In addition, the gap between the guide groove and the protrusion discharges the air in the insertion hole to the outside when inserting the sliding pin, which facilitates the assembly work and smooths the sliding movement of the sliding pin during braking. The caliper can be operated smoothly.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a cross-sectional plan view of a main part of a disc brake, FIG. 2 is an exploded perspective view of a sliding pin and a bush, and FIG. Figure III-III
FIG. 4 is a cross-sectional view of the main part of the second embodiment, and FIG. 5 is a cross-sectional view of the main part of the third embodiment. 1 ... Disc brake, 2 ... Bracket 2a ... Support arm, 2b ... Insertion hole, 3 ... Disc rotor, 4 ...
Sliding pin, 4a ... Base part, 4b ... Base end surface, 4c ... Female screw hole, 4d ... Shaft part 4e, 4f, 4g ... Protrusion, 5 ...
... Caliper 5d ... Mounting arm, 5e ... Through hole, 8 ... Bolt 9 ... Bush, 9a ... Slit-shaped guide groove 1
0, 11, 12 ... Ventilation gap

Claims (1)

[Scope of utility model registration request] A sliding pin is provided on either one of a bracket fixedly mounted on a vehicle body and a caliper arranged to straddle a disk rotor, and an insertion hole is provided on the other, and a slide member sliding on the insertion hole is provided. In a pin slide type vehicle disc brake that movably supports the caliper in the disc axial direction by a moving pin, a bush provided with an axial guide groove over the entire length is press-fitted and fixed in the insertion hole, A protrusion having a smaller cross-sectional area than the guide groove is formed on the outer periphery of the sliding pin, and the protrusion is engaged with the guide groove to insert the sliding pin into the bush. A sliding pin mounting structure for a pin slide type disk brake for vehicles, characterized in that a gap for ventilation is formed between the sliding pin and the vehicle.