JPS624570B2 - - Google Patents

Description

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

This type of disc brake has a caliper that has a pair of opposing parts that sandwich a disc, and uses a hydraulic mechanism built into one of the opposing parts to press a friction pad on one side against the disc, and a reaction force is generated at this time. When the caliper slides in the axial direction of the disc, the other opposing part operates to press the friction pad on the other side against the disc.
This is accomplished by a caliper guide mechanism consisting of a pair of parallel slide pins interposed between a fixed support disposed at the edge of the disk.

This caliper guide mechanism has a structure in which a slide pin fixed to one of the supports or the caliper guides the sliding movement of the caliper by slidingly fitting into an opening formed in the other. Usually, the sliding relationship is different depending on the positional relationship with respect to the rotational direction of the disk. In other words, the slide pin located on the disc rotation side receives torque during braking, or the sliding pin is rigid in order to ensure the sliding direction of the caliper, but the slide pin located on the disc rotation side In order to absorb deviations in the parallelism of a pair of slide pins due to machining errors or changes in parallelism due to torque action during braking, the slide pins that slide into the opening of the support or caliper have a diameter. In order to allow a certain degree of relative movement in the direction, an auxiliary sliding relationship is provided via an elastic body (button).

The present invention provides a disc brake in which one of the slide pins (hereinafter referred to as the main slide pin) forms a rigid sliding relationship and the other (hereinafter referred to as the auxiliary slide pin) forms a sliding relationship via an elastic bush. This is an improvement on the caliper guide mechanism of the first type, and prevents uneven wear and dragging of the friction pads caused by the difference in sliding resistance caused by the difference in the sliding relationship between the two.

In other words, when the auxiliary slide pin slides through an elastic body compared to the rigid sliding fit of the main slide pin, the sliding resistance may vary by about 10 times. This is because it is difficult to ensure smooth sliding.

In order to eliminate such problems, the present invention has the following features:
While ensuring a certain degree of error absorption in the radial direction on the auxiliary slide pin side, the sliding movement corresponding to the gap between the normal disk and the friction pad is achieved by rigid sliding as on the main slide pin side. It was meant to be done.

The present invention will be described below based on embodiments shown in the drawings.

Embodiment 1 In FIG. 1, 1 is a disk, 2 is a support extending from the vehicle body fixing part to the edge of this disk 1, and has a vertical plane part on one side of the disk 1 that is parallel to its rotating surface; It consists of a horizontal surface portion extending across the edge of the disk 1 to the other side so as to be perpendicular to the rotation surface thereof. A caliper 3 is arranged to straddle the edge of the disk 1, and is supported by left and right main and auxiliary slide pins described below so that it can slide in the axial direction of the disk 1. A hydraulic mechanism (not shown) built in one side 4 of the sandwiched opposing parts 4 and 5 presses one side 6 of the friction pads 6 and 7 placed oppositely between the disk 1 against the disk 1. By sliding under the reaction force, the other opposing portion 5 operates to press the other friction pad 7 against the disk 1.

A main slide pin 8 is fixed by welding to the vertical plane part of the support 2, and is rigidly slidably fitted into a blind hole opening 9 formed in the caliper 3.

10 is dustproof boots.

Reference numeral 11 denotes an auxiliary slide pin, which is fixed to the vertical plane part of the support 2 by screwing a bolt 12 passing through the cylinder, and is formed on the caliper 3 through a rigid sleeve 13 that is slidably fitted on the outer periphery. Opening 1
It is slidably fitted to a rubber bush 15 fixed to 4. 16 and 17 are dustproof boots.

As shown in the figure, the rigid sleeve 13 is assembled so as to have a degree of freedom of movement in the axial direction of the auxiliary slide pin 11 by a distance l, and this distance l is the specified gap between the friction pad 7 and the disc 1 when the brake is not applied. The purpose is to leave a specified gap between the friction pad and the disc when not braking.

The state shown is when the brake is activated.

Next, to explain its operation, the hydraulic actuation mechanism presses the friction pad 6 against the disk 1, and this reaction force causes the caliper 3 to move between the main and auxiliary slide pins 8 and 1.
1, the opposing portion 5 presses the other friction pad 7 against the disk 1, and as a result, the pair of friction pads 6, 7 clamp and press the disk 1 to obtain a braking force. The sliding movement of the caliper 3 during this brake operation normally produces uniform sliding resistance due to the rigid sliding portions of both the main and auxiliary slide pins 8 and 11. That is, the auxiliary slide pin 11
On the side, the rigid sleeve 13 is slidably fitted to the rigid auxiliary slide pin 11 on its inner circumferential surface, and also to the rubber bushing 15 on its outer circumferential surface; The sliding resistance is smaller than when the brake is on, and therefore, when the brake is not applied, the gap l shown in the figure is located on the other end side of the rigid sleeve 13. This is because sliding occurs between the rigid sleeve 13 and the auxiliary slide pin 11 while the rigid sleeve 13 and the auxiliary slide pin 11 have a degree of freedom of movement (up to the illustrated state).

When the amount of sliding of the caliper 3 exceeds the gap 1 due to lining wear of the friction pads 6 and 7, sliding occurs between the rubber bush 15 and the rigid sleeve 13.

When the caliper 3 returns to its initial position due to vibration or the like (a return device for the caliper 3 may be installed) when the brake is released, the rigid sleeve 13 slides back integrally with the caliper 3 via the rubber bush 15, and the main In the example, the rigid sleeve 13 stops when it comes into contact with the flange portion of the auxiliary slide pin 11. Further return sliding of the caliper 3 is regulated by relatively large sliding resistance by the rubber bush 15, and problems such as knockback are prevented.

Embodiment 2 As shown in FIG. 2, in this example, the auxiliary slide pin side has almost the same structure as Embodiment 1, and the sliding resistance on the main slide pin side is also increased by increasing the sliding amount of the caliper. I'm trying to change it. In other words, even when relatively large sliding resistance is applied through the elastic body when the lining of the friction pad wears,
The sliding resistance of the main and auxiliary slide pins was balanced.

To describe its configuration, 101 is a disk, 10
2 is support, 103 is caliper, 104,10
5 is an opposing part, 106 and 107 are friction pads, 10
8 is the main slide pin, 109 is the blind hole opening, 110
is dustproof boot, 111 is auxiliary slide pin, 11
2 is a bolt, 113 is a rigid sleeve, 114 is an opening, 115 is a rubber button, 116 and 117 are dustproof boots, and in this example, the main slide pin 108
is not directly fitted into the blind hole opening 109 but is fitted via a rigid sleeve 118, and the stopper 119 allows this rigid sleeve 118 to be at the same distance l from the main slide pin 108 as the auxiliary slide pin 111 side. It is assembled to provide sliding freedom. Furthermore, this rigid sleeve 118
As shown, a rubber ring 120 is interposed in the blind hole opening 109 of the caliper so as to provide a relatively large sliding resistance balanced with the rubber bush 115 on the auxiliary slide pin 111 side.

Note that the illustrated state shows a non-braking state.

In the above configuration, normally the rigid sleeves 113 and 118 are used as the main and auxiliary slide pins 1, respectively.
Due to the degree of freedom of movement of the distance l provided for the pads 08 and 111, a small sliding resistance of rigid sliding is generated, and due to the lining wear of the friction pads 106 and 107, the sliding amount of the caliper 103 is reduced to the distance l. When the distance exceeds 100 mm, a relatively large sliding resistance will occur in both cases through the rubber.

As described above, the disc brake caliper guide mechanism according to the present invention maintains the radial error absorption function of the conventional auxiliary slide pin, and
This eliminates the problem caused by the difference in sliding resistance between the main and auxiliary slide pins, and the practical benefits are extremely large.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a partial plan cross-sectional view of a disc brake showing embodiment 1, and FIG.
The figure is a partial plan cross-sectional view of a disc brake showing a second embodiment. 1,101...Disk, 2,102...Support, 3,103...Caliper, 4,5,104,1
05...Opposing part, 6,7,106,107...Friction pad, 8,108...Main slide pin, 9,109
...Blind hole opening, 10,110...Dustproof boots, 11,
111... Auxiliary slide pin, 12, 112... Bolt, 13, 113... Rigid sleeve, 14, 114
...Opening, 15,115...Rubber button, 16,1
7, 116, 117...dustproof boots, 118...rigid sleeve, 119...stopper, 120...rubber ring.

Claims (1)

[Claims] 1. A caliper that straddles the edge of the disk is supported by a support so as to be able to slide in the axial direction of the disk via main and auxiliary slide pins that are spaced apart approximately in the circumferential direction of the disk. In addition, in a disc brake in which an elastic body is interposed between an auxiliary slide pin and an opening of a caliper or support that is in a sliding relationship with the auxiliary slide pin, which allows a certain relative movement in the radial direction, between the auxiliary slide pin and the elastic body. In addition, a rigid sleeve is provided that slides on the inner and outer circumferential surfaces of these, and has a degree of freedom of movement in the axial direction relative to the auxiliary slide pin over a certain length corresponding to the specified gap between the friction pad and the disk when not braking. A caliper guide mechanism for a disc brake, characterized in that the sliding resistance between the rigid sleeve and the elastic body is greater than the sliding resistance between the rigid sleeve and the slide pin. 2. A caliper that straddles the edge of the disk is supported by a support so as to be able to slide in the axial direction of the disk via main and auxiliary slide pins that are spaced apart approximately in the circumferential direction of the disk, and is In a disc brake in which an elastic body is interposed between openings in a caliper or a support that are in a sliding relationship with the caliper to allow constant relative movement in the radial direction, each of the main and auxiliary slide pins and the opening or elastic Between the bodies, the inner and outer circumferential surfaces are slidably fitted to these two members, and are free to move in the axial direction relative to the main and auxiliary slide pins over a fixed length corresponding to the specified gap between the friction pad and the disk when not braking. Further, an elastic body for increasing sliding resistance is disposed between the opening on the main slide pin side and the rigid sleeve, and the sliding resistance between each of the rigid sleeves and the elastic body is disposed. A caliper guide mechanism for a disc brake, characterized in that the dynamic resistance is greater than the sliding resistance between the rigid sleeve and the main and auxiliary slide pins.