JPH0717862Y2 - Disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a disc brake, and more particularly, to a disc brake of a vehicle body through a slide pin axially slidably fitted in a bottomed guide hole. A caliper that is slidably mounted in the rotor axis direction is connected to the mounting part and the mounting part, and the piston is connected to the cylinder part formed on the caliper through a piston seal that acts as a retractor and the piston The present invention relates to a disc brake configured to be slidable in a direction.

[Prior art]

The above-mentioned disc brake is disclosed, for example, in JP-A-56-1604.
No. 31 publication.

In the publication, therefore, an annular groove having an opening wider than the bottom surface is formed on the outer peripheral surface of the slide pin, and an elastic member that elastically contacts the inner peripheral surface of the guide hole at the outer peripheral surface is formed in the groove. There is shown a disc brake in which the caliper can be returned to the original position by inserting the body and deforming the elastic body in the axial direction and returning (retracting).

[Problems to be solved by the device]

In the above-described conventional disc brake, since the elastic body assembled to the outer periphery of the slide pin elastically contacts the inner peripheral surface of the guide hole, not only the above-mentioned function (returning to the original position of the caliper), Although it can be expected to have the function of mitigating the collision between the slide pin and the guide hole due to the vibration while the vehicle is running, the outer peripheral surface of the elastic body slips in the axial direction during braking and the shape of the elastic body returns to its original state. In this case, in order to prevent the caliper from returning to its original position because the elastic body obstructs the sliding of the caliper obtained by the retracting action of the piston seal when releasing the braking, the friction pad is brought into sliding contact with the rotor by the caliper. When the friction pad is held, a large drag torque is generated and the friction pad is worn early.

The present invention has been made to solve the above-mentioned problems, and does not impede the caliper sliding under any circumstances, and alleviates the collision between the slide pin and the guide hole due to the vibration while the vehicle is running, and produces a strange noise. The purpose is to provide a disc brake that prevents the occurrence.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a mounting and a mounting that are assembled to a part of a vehicle body through a slide pin that is slidably fitted in a bottomed guide hole. A caliper that is slidably mounted in the rotor axial direction is connected to the piston, and the piston is slidably mounted in the rotor axial direction via a piston seal that acts as a retractor on the cylinder part formed on the caliper. In the disc brake, the outer peripheral surface of the slide pin (or the inner peripheral surface of the guide hole) is provided with an annular groove, and the outer diameter (or inner diameter) is larger than the outer diameter of the slide pin in the annular groove. The feature is that an elastic member having a smaller friction coefficient than the inner diameter of the guide hole is interposed.

[Action effect]

In the present invention, a gap smaller than the gap between the slide pin and the guide hole (the gap that ensures sliding) is formed between the elastic member and the guide hole (or between the elastic member and the slide pin). Therefore, the elastic member and the guide hole (or the elastic member and the slide pin) come into contact with each other before the slide pin and the guide hole collide with each other due to the vibration during traveling of the vehicle, and the collision between the slide pin and the guide hole is mitigated and an abnormal noise is generated. In addition, the friction pad, caliper, and piston do not undergo elastic deformation of the elastic members (deformation in the sliding direction of the caliper) due to the retracting action of the piston seal and the rotational runout of the rotor when braking is released. When the caliper returns to its original position, the elastic body having a low coefficient of friction hardly interferes with the sliding of the caliper, and the trouble caused by the sliding failure of the caliper is greatly improved.

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a disc brake according to the present invention, which includes a pair of friction pads 11 and 12 disposed on both sides of a disc rotor 10 which rotates integrally with a wheel (not shown). A mounting 13 fixed to a part of a vehicle body (not shown) having arm portions 13a and 13b slidably supporting the friction pads 11 and 12 in the rotor axial direction, and the friction pad 11 to the disc rotor 10. A pair of slides that integrally have a cylinder portion 15a that incorporates a piston 14 that pushes the piston 14 through a well-known retractor seal S and a claw portion 15b that pushes the friction pad 12 toward the disc rotor 10 A caliper 15 is supported on the mounting 13 via pins 16 and 17 so as to be slidable in the rotor axial direction. The disc brake is
It is assembled to the vehicle body with the slide pin 16 facing upward.

As shown in FIG. 3, the slide pin 16 is assembled so as to be slidable in the axial direction by applying grease to the bottomed guide hole 13c provided in the mounting 13, and is also attached by a bolt 18 to the caliper 15. And the sliding portion is protected by the pin boot 21. The pin boot 21 is made of rubber alone and is fitted to the slide pin 16 at one end,
The other end is fitted to the mounting 13. The inside of the pin boot 21 communicates with the bottom of the guide hole 13c through an axial groove 16c provided in the slide pin 16.

On the other hand, as shown in FIG. 4, the slide pin 17 is assembled so as to be slidable in the axial direction by applying grease to the bottomed guide hole 13d formed in the mounting 13 and assembled with the bolt.
It is connected to the caliper 15 by 19 and the pin boots 22
The sliding part is protected by. Pin boots 22 are made of rubber
22a and a collared metal sleeve 22b fixed to this, which is fitted to the slide pin 16 at one end, and mounting 1 at the other end (side of the collared metal sleeve 22b).
3 is tightly fitted in the mounting hole 13e and slides on the inner circumference.
Supports 17 elastically. In addition, the inside of the pin boot 22 is guided through the axial groove 17a provided in the slide pin 17 to
It communicates with the bottom of 3d.

Therefore, in this embodiment, the slide pin 16 is provided with the annular groove 16a on the outer peripheral surface of the tip portion thereof, and the elastic member (for example, fluororesin such as Teflon) 23 having a low friction coefficient is provided in the annular groove 16a. Is fitted. The elastic member 23 is an annular groove.
Although not shown in FIG. 3, the outer diameter of the slide pin 16 is larger than that of the slide pin 16 and smaller than that of the guide hole 13c.

Therefore, in this embodiment, the elastic member 23 and the guide hole
A gap smaller than the gap between the slide pin 16 and the guide hole 13c (gap that ensures sliding) is formed between the 13c. Therefore, the elastic member 23 and the guide hole 13c come into contact with each other before the slide pin 16 and the guide hole 13c collide with each other due to the vibration while the vehicle is running, and the collision between the slide pin 16 and the guide hole 13c is alleviated and an abnormal noise is generated. In addition, the friction pads 11 and 12, the caliper 15, and the piston 14 elastically deform the elastic member 23 (deformation in the sliding direction of the caliper 15) due to the retracting action of the piston seal S and the rotational runout of the rotor when the braking is released. The caliper 15 returns to its original position without braking, and when the caliper 15 returns to its original position, the elastic body 23 with a low coefficient of friction hardly interferes with the sliding of the caliper 15, and the troubles due to the sliding failure of the caliper 15 are greatly improved. To be done.

In the above embodiment, an example in which the annular groove 16a is provided on the outer peripheral surface of the tip portion of the slide pin 16 and the elastic member 23 is fitted in the annular groove 16a has been described. As shown in the figure, the annular groove 1 is formed on the inner peripheral surface of the guide hole 13c.
It is also possible to provide 3c1 and fit the elastic member 24 in the annular groove 13c1. In this case, the inner diameter of the elastic member 24 is larger than the outer diameter of the slide pin 16 and smaller than the inner diameter of the guide hole 13c. Further, as shown in FIG. 6, an annular groove 16b may be provided on the outer peripheral surface of the intermediate portion of the slide pin 16 and the elastic member 23 may be fitted in the annular groove 16b.

In the above embodiment, since the slide pin 17 is elastically supported by the other end of the pin boot 22, an elastic member is not interposed between the slide pin 17 and the guide hole 13d, When a collision sound is generated between the guide holes 13d, an elastic member may be provided on the outer periphery of the tip end portion of the slide pin 17 as with the slide pin 16.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a disc brake according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is of FIG.
FIG. 5 is a sectional view taken along line IV-IV, FIG. 5 is a partial sectional view showing a modification of the present invention, and FIG. 6 is a view corresponding to FIG. 3 showing another modification of the present invention. Explanation of symbols 10 …… Rotor, 11,12 …… Friction pad, 13 …… Mounting, 13c, 13d …… Guide hole, 14 …… Piston, 15…
… Calipers, 16,17 …… Slide pins, 16a, 16b, 13c1…
… Annular groove, 23, 24 …… Elastic member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Nakamura 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Masayoshi Katagiri 1-cho, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. ( 56) Bibliography Sho 61-33305 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A mounting which is assembled to a part of a vehicle body and slides in the rotor axial direction with respect to the mounting through a slide pin slidably fitted in a bottomed guide hole in the axial direction. Calipers that can be assembled are connected,
Further, in a disc brake in which a piston is slidably attached to a cylinder portion formed in a caliper through a piston seal that performs a retracting action in a rotor axial direction, an outer peripheral surface of the slide pin or an inner portion of the guide hole An annular groove is provided on the peripheral surface, and an elastic member having an outer diameter or inner diameter larger than the outer diameter of the slide pin and smaller than the inner diameter of the guide hole and having a low friction coefficient is interposed in the annular groove. Disc brake.