JPS6234969B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a caliper guide mechanism in a disc brake.

This type of disc brake has a caliper placed across the disc that is guided and slid in the axial direction of the disc by two parallel main and auxiliary slide pins on the left and right. The slide pins are clamped against the disc to obtain braking force, and each of the slide pins is fixed to one of the supports or calipers arranged on the edge of the disc, and is slid into an opening formed in the other. It is composed of

In such a caliper guide mechanism, one slide pin (hereinafter referred to as the main slide pin) is connected to the brake in order to prevent the parallelism of the left and right slide pins and the tolerance in the assembly interval, or to prevent knockback, shakeback, etc. when the brake is released. A rigid sliding relationship is used to prevent the caliper from tilting during operation and to ensure stable sliding direction. However, the other slide pin (hereinafter referred to as the auxiliary slide pin) has a diameter Usually, an elastic bushing is interposed to allow a certain degree of movement in the direction.

However, the problem with this configuration is that the sliding resistance of the caliper due to the main and auxiliary slide pins is greater on one side because it is a rigid body and on the other through an elastic bushing, and the imbalance causes friction. There was a risk of uneven wear of the pad lining or dragging when releasing the brake.

Therefore, the inventor of the present invention has proposed that when a brake is operated by sliding a caliper through a predetermined gap between a disk and a friction pad, rigid sliding occurs between the auxiliary slide pin and the opening of the caliper or support. The present invention provides a structure in which the caliper slides through the elastic bushing only when the sliding amount of the caliper exceeds the predetermined gap amount due to lining wear of the friction pad. This is a further improvement. That is, in the same structure, an elastic bush is interposed between an opening formed in one of the caliper or the support and an auxiliary slide pin fixed to the other, and the auxiliary slide pin and the elastic push are further slidably engaged with each other on the inner and outer circumferential surfaces. In addition, a rigid sleeve having a degree of freedom of movement corresponding to a predetermined gap between the disk and the friction pad is interposed.The present invention provides a caliper guide mechanism that allows this configuration to be easily assembled. be.

The present invention will be explained below based on the embodiment shown in the drawings. In FIG. 1, 1 is a disk, 2 is a support, and 3 is a structure that sits on the edge of the disk 1 and is connected to main and auxiliary slide pins 8 and 12 as described below. It is a caliper that is guided and slid in the axial direction of the disk, and one of the opposing parts 4 and 5 that sandwich the disk 1 has a built-in hydraulic operating mechanism that operates to press the friction pad 6 against the disk 1. The other opposing part 5 is the caliper 3
It forms a reaction part that presses the friction pad 7 against the disk 1 by sliding. Reference numeral 8 denotes a main slide pin which is fixed to the support 2 on the rotation side of the rotating disk 1 and rigidly slides into an opening 9 formed in the caliper 3. The sliding surface of the main slide pin 8 and the opening 9 is covered by a cap 10 and a dustproof boot 11.

Reference numeral 12 denotes an auxiliary slide pin fixed to the support 2 on the rotation side of the rotating disk 1, and the present invention is characterized by the assembly structure of this auxiliary slide pin 12. The auxiliary slide pin 12 of this example is assembled so that a rigid sleeve 14 having a smaller diameter than the screw hole 13 has a fixed length of freedom of axial movement in a screw hole 13 formed in the support 2 and penetrating in the disk axial direction. The distal end, which is rigidly slid together, is inserted through the support 2 from the opposite side to the opening 15 of the caliper 3.
The rubber bushing 15 is fitted into the rubber bushing 16 that is open at one end and is also used as a dustproof boot.
The open end of the boot part is fitted into the circumferential groove 17 of the auxiliary slide pin 12, and the rigid sleeve 1 is press-fitted and fixed to the tip of the auxiliary slide pin 12.
A stopper 18 that restricts the movement limit of the support 2 is fitted loosely into the inner diameter of the rubber bush 16, and a flange portion 20 that forms a stopper that restricts the movement of the other rigid sleeve 14 is inserted into the screw hole 13 of the support 2. The diameter is small enough to allow insertion.
This flange 20 functions as the above-mentioned stopper and also functions to form the circumferential groove 17 into which the sealed end of the dustproof boot portion is fitted.

According to such a configuration, after fixing the main slide pin 8 to the support 2 by welding or the like and assembling the caliper 3, the work can be completed by assembling the auxiliary slide pin 12 side to which the rubber bush 16 has been previously assembled. This has the advantage that the work when replacing the friction pads 6, 7 can be done easily.

To briefly explain its operation, in the non-braking state shown in FIG. Occurs between 18 and 18. When the brake is applied, one of the friction pads 6 is pressed against the disk 1 by a piston built in the facing portion 4, and the caliper 3 slides due to the reaction force and presses the other friction pad 7 against the disk 1. The sliding movement of the caliper 3 at this time is guided by the main and auxiliary slide pins 8 and 12.
The sliding properties are balanced as follows. That is, the main slide pin 8 is sliding in a rigid relationship, and the other auxiliary slide pin 12 is a rigid sleeve 1.
4 slides against the auxiliary slide pin 12 that forms a rigid sliding relationship with low resistance initially, and after the rigid sleeve 14 abuts against the stopper 18, the rubber bush 16 has a relatively high sliding resistance. slide against. Therefore, if the gap l is set to correspond to the gap between the disc 1 and the friction pad 7 when the brake is not applied, the sliding between the rigid sleeve 14 and the rubber bush 16 will only occur in response to wear of the pad lining. Normally, the caliper 3 slides approximately in balance between the main and auxiliary slide pins 8 and 12.

FIG. 2 shows another example of the configuration on the auxiliary slide pin side, and since the other configurations are substantially the same as those of the previous embodiment, their explanation will be omitted. In this example, auxiliary slide pin 1
Numeral 9 has a cylindrical shape separate from the fixing bolt 20, and is assembled by inserting the fixing bolt 20 from the side opposite to the support 2 of the auxiliary slide pin 19 and screwing it into the screw hole 21. A rubber bush 22 is fixed to the caliper opening 22, and boot portions 23 and 24 extend from both ends thereof and are fitted into the circumferential groove 25 of the auxiliary slide pin 19 and the circumferential groove 27 of the stopper 26. Reference numeral 28 denotes a rigid sleeve interposed between the auxiliary slide pin 19 and the rubber bush 22, which can move relative to the auxiliary slide pin 19 in the axial direction within a certain range regulated by its flange and the stopper 26. It is configured like this. That is, the stopper 26 is fixed at the same time by assembling the fixing bolt 20 that fixes the auxiliary slide pin 19 to the support 2, and functionally serves to limit the movement limit of the rigid sleeve 28 and also serves as a member for fitting the boot. be.

According to this structure, the operation is substantially the same as that of the embodiment described above, and the friction pads 6 and 7 can be easily replaced by removing the bolts, and the auxiliary slide pin 19 and the rigid sleeve can be easily replaced. 28 has the advantage that inspection and replacement are extremely easy.

FIG. 3 is an example showing still another configuration on the auxiliary slide pin side, in which the fixing bolt 30 for fixing the auxiliary slide pin 29 to the support 2 is
The auxiliary slide pin 29 is provided so as to be inserted through a through hole 31 formed in the disk axial direction and screwed onto the threaded portion 32 of the auxiliary slide pin 29. and a boot portion 36 extending from a rubber bush 35 fixed to the caliper opening 34 and regulating the movement limit of the rigid sleeve 33;
37 is fitted with a stopper 39 that is press-fitted into the flange portion 38 and tip portion of the auxiliary slide pin 29.
It is designed to be carried out at

As described above, the present invention provides a disc brake in which at least one of the main and auxiliary slide pins is in a sliding relationship with the opening of the caliper via an elastic body, and the present invention provides a disc brake that is normally required between the disc and the friction pad when not braking. When the caliper slides during braking, the sliding resistance equivalent to the amount of gap to prevent dragging is given as a small resistance balanced with the main slide pin side, which may cause lining wear during braking. The structure of the auxiliary slide pin side is such that it slides with relatively high resistance through an elastic body only in certain cases, making assembly and maintenance inspection easy, and the benefits are extremely large. It is what it is.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional plan view of a disc brake showing one embodiment of the present invention, Fig. 2 is a partially sectional plan view showing another embodiment, and Fig. 3 is a partially sectional plan view showing yet another embodiment. FIG. 1... Disc, 2... Support, 3... Caliper, 4, 5... Opposing part, 6, 7... Friction pad, 8... Main slide pin, 9... Opening, 10...
...Cap, 11...Boots, 12, 19, 29
...Auxiliary slide pin, 13...Screw hole, 14,
28, 33... Rigid sleeve, 15, 34... Opening, 16, 22, 35... Rubber bush, 17,
25, 27... Peripheral groove, 18, 26, 39... Stopper, 20, 30... Fixing bolt, 21... Screw hole, 23, 24, 36, 37... Boot part, 31
...Threaded hole, 32...Threaded part, 38...Flange part.

Claims (1)

[Scope of Claims] 1. A caliper that straddles the edge of the disk is supported so as to be able to slide in the axial direction of the disk via main and auxiliary slide pins that are fixed to a support and spaced apart in the circumferential direction of the disk, At least one of the main and auxiliary slide pins is interposed between the slide pin and the elastic body so as to slide on both sides in a disc brake having a structure in which at least one of the main and auxiliary slide pins slides in contact with a carrier opening that is in a sliding relationship with the main slide pin via an elastic body. A rigid sleeve is assembled to the slide pin so as to have a relative degree of freedom with a constant gap in the axial direction, and the slide pin is fitted with a stopper that restricts movement of the end of the boot that seals the sliding portion of the slide pin. A disc brake caliper guide mechanism, characterized in that one of the limits of movement of the rigid sleeve with respect to the slide pin is restricted by the stopper. 2. A caliper that straddles the edge of the disk is supported so as to be able to slide in the axial direction of the disk via main and auxiliary slide pins that are fixed to a support and spaced apart in the circumferential direction of the disk. In a disc brake having a structure in which at least one of the slide pins and the elastic body slides into contact with the caliper opening through an elastic body, a rigid sleeve interposed between the slide pin and the elastic body so as to slide on both sides is slid. The rigid sleeve is assembled to the pin so as to have a relative degree of freedom with a constant gap in the axial direction, and the movement limit of the rigid sleeve with respect to the slide pin is restricted by stoppers provided at both ends of the slide pin. Features a disc brake caliper guide mechanism.