JPH0156293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a sliding support device for a pin type disc brake.

Generally, in a pin type disc brake, an opening is formed in either a caliper disposed to straddle the edge of the rotor or a fixed support integral with the vehicle body, and an opening is formed in either the caliper or the fixed support integrated with the vehicle body. Usually, the caliper is constructed by fitting and sliding a slide pin that is assembled and fixed, so that the caliper is movably supported in the rotor axial direction with respect to the fixed support.

By the way, in such a sliding support device, since they are provided in pairs spaced apart in the circumferential direction of the rotor, the sliding surface of the opening and the slide pin should be adjusted to accommodate tolerances in pitch dimensions. Usually, a rubber bushing is fitted in between, and a boot part is integrated or attached to this rubber bushing to cover the surface extending from the opening of the slide pin so as to seal it from the outside air. is also widely known.

However, with this configuration, there are problems in that the boot portion may be damaged by flying stones while the vehicle is running, or the boot or bushing may be cut when replacing parts by twisting the slide pin and opening. FIG. 1 shows an example of such a conventional configuration, where 1 is a fixed support, 2 is a slide pin fixed to the fixed support 1 in a cantilevered manner, 3 is a boss opening of the caliper, and 4 is a This is a rubber bush that is fixedly fitted to the inner circumferential surface of the opening 3, and is fitted across both ends of the caliper opening 3 through a recess 4a on the outer periphery. 4b and 4c are boot parts integrally extended from both ends of the rubber bush 4, and 4b, on the other hand, has a bellows-like body part that telescopically covers the outer circumferential surface of the slide pin 2, and its outer circumferential groove 2a. The ends are tightened and fixed. Also, the other boot portion 4c
has a bag shape that encloses the free end of the slide pin 2 and covers the slide pin 21.

If these boot portions 4b and 4c are damaged by flying stones or the like, the sealing of the sliding surfaces from the outside air will be broken, and the free end of the slide pin 2 will hit the boot 4c, causing the boot portions to be damaged. It is conceivable that damage may occur during replacement work.

Therefore, the present invention has been made with the aim of reducing problems such as damage to the boot part due to flying stones as much as possible, and is substantially attached to the caliper and moves relative to the slide pin. By wrapping the protruding part of the slide pin in a bag shape, the boot part that does not require a bellows or other expandable part can be made of a rigid body to prevent the rubber boot from being damaged by flying stones or the corners of the end of the slide pin. This reduces the risk of this happening. Therefore, the gist of the present invention is to have an opening formed in either a caliper disposed so as to straddle the edge of the rotor or a fixed support fixed to the vehicle body, and the caliper or the fixed support A sliding support device in which a slide pin assembled and fixed in a cantilever manner to the other side of the body protrudes through the opening to support the caliper so as to be movable in the rotor axial direction. This sliding support device for a disc brake is characterized in that a protector made of a cylindrical rigid body with one end open and wrapped in a bag shape is fitted, and a rubber boot is installed across the open end of the protector and the outer periphery of a slide pin.

Example 1 In FIG. 2, 11 is a fixed support, 12 is a slide pin fixed to this fixed support 11, and 1
Reference numeral 2a denotes an outer circumferential groove thereof, 13 is an opening of the caliper boss, and 14 is a cylindrical protector with one end open, which is fixed by press fit or screwing into the caliper boss opening 13 of the small diameter cylinder on the open end side, and is fixed on the inner circumferential surface thereof. is configured to be slidably fitted onto the outer periphery of the slide pin 12. Further, the closed end side is provided with a large diameter and is formed to enclose the free end of the slide pin while maintaining a gap.

15 is a rubber boot with a bellows-shaped body;
One end thereof is fastened to an outer circumferential groove 12a of the slide pin 12, and the other end is fastened to an outer circumferential groove 14a formed in the open end edge of the protector 14.

Note that the protector is made of a rigid body such as metal or plastic.

FIG. 2B shows a perspective view of the protector 14.

According to such a structure, the sliding support device prevents the protector 14 from being damaged by flying stones, and the boot is not cut by the protrusion that is the free end of the slide pin 12, so that the sliding support device can prevent the protector 14 from sliding. There is the advantage that the sliding surfaces of the device are effectively sealed from the outside atmosphere.

Embodiment 2 In the embodiment shown in FIG. 3, a protector 24 that is press-fitted (screwed) and fixed into an opening 23 of a caliper boss is slid onto a slide pin 22 via a rubber bushing 26. The boot 25 has a configuration in which it is integrally extended, and other configurations are the same as in Embodiment 1 shown in FIG. The explanation has been omitted.

FIG. 2B shows a perspective view of the protector 24. In this embodiment, a slit 24b is formed in the small diameter cylindrical portion of the protector 24 in the generatrix direction to improve the ease of assembly to the body boss. ing. The air chamber may be provided with a pinhole to vent air.

The reduction in the risk of damage due to this configuration is similar to that of the previous embodiment, and in this configuration, the rubber bush 26 allows a certain degree of relative movement in the radial direction between the opening 23 and the slide pin 22. You can also make a profit.

Embodiment 3 In the embodiment shown in FIG. 4, a rubber bushing 36 is assembled and fixed in the opening 33 of the caliper boss, and the rubber bushing 36 is configured to slide on the slide pin 32 via the protector 34. Compared to the one in FIG. 3 where the surface is formed between the rubber bush and the slide pin, the sliding surface is formed by the protector 34.
and the slide pin 32, there is an advantage that the sliding resistance can be set to be small.

The other configuration is the same as that of the second embodiment shown in FIG. 3, so the same members are indicated by adding 10 to the reference numerals, and their explanations are omitted.

As described above, the sliding support device according to the present invention has a relatively simple structure that greatly reduces the risk of breakage, and has various advantages such as improved durability and improved sealing of the sliding surface. Its usefulness is great.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the conventional structure of a sliding support device for a disc brake, Figure 2 A is a sectional view of the sliding support device showing Embodiment 1 of the present invention, and Figure 2 B is a perspective view of a separate protector thereof. 3A is a sectional view of the sliding support device of the second embodiment, FIG. 3B is a perspective view of the protector, and FIG. 4 is a sectional view of the sliding support device of the fourth embodiment. 1, 11, 21, 31...Fixed support, 2, 1
2, 22, 32...Slide pin, 2a, 12
a, 22a, 32a... outer peripheral groove, 3, 13, 2
3, 33...opening, 4...rubber button, 4a...
...Recess, 4b, 4c...Boot part, 14, 24,
34...Protector, 14a...Outer circumferential groove, 15,
25, 35...boots, 26,36...butsuyu.

Claims (1)

[Claims] 1 A rotor having a through opening formed in either a caliper arranged to straddle the edge of the rotor or a fixed support fixed to the vehicle body, and assembled in a cantilever manner on the other of the caliper or the fixed support. The fixed slide pin protrudes through the opening to support the caliper so as to be movable in the axial direction of the rotor. A sliding support device for a disc brake, characterized in that a protector made of a rigid body is fitted, and a rubber boot is installed across the open end of the protector and the outer periphery of the slide pin.