JPH0642111Y2 - Pin slide type disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicle disc brake, and more particularly to a caliper support structure in a caliper floating pin slide type disc brake.

[Prior Art] The caliper floating pin slide type disc brake is
For example, as described in Japanese Utility Model Laid-Open No. 61-182425, a caliper is slidably supported on a fixed bracket (mounting bracket) fixed to a vehicle through a sliding pin (slide pin). In this caliper support structure, as described in the above publication, a support cylinder of the caliper is slidably fitted to a slide pin embedded in a mounting bracket. An elastic bellows-shaped elastic boot (dust boot) is stretched between the slide pin and the support cylinder, and an inner end bead portion of the elastic boot is formed in an annular groove formed on the inner peripheral surface of the opening of the support cylinder. It is fitted. Therefore, the bead portion of the elastic boot is interposed between the slide pin and the support cylinder.

[Problems to be Solved by the Invention] In the conventional coupling relationship between the slide pin and the support cylinder, since the bead portion of the elastic boot of the elastic material is in direct contact with the slide pin, the support cylinder slides on the slide pin. It becomes a sliding resistance when moving. Therefore, increasing the bead portion increases the sliding resistance, and thus has its own limit. However, this is inadequate from the viewpoint of the sealability which is the original function of the elastic boot, that is, the sealability. If this is overlooked, the sealability will be impaired and the sliding resistance will eventually increase.

A so-called "disc brake squeal" is an important problem to be solved in a vehicle equipped with a disc brake in recent years, and when a vehicle is braked, vibration of an audible frequency generated near the disc brake is transmitted as noise to a vehicle occupant and causes discomfort. There is. In this regard, as described above, if the sliding resistance between the support cylinder and the slide pin increases and a smooth sliding action cannot be ensured, the contact of the friction pad with the disk rotor becomes unstable, or even surface pressure is not maintained. There is a problem in that it is difficult to give the distribution, and stick-slip, which is a cause of disc brake squeal, is likely to occur.

In view of this, the present invention has an object to ensure a smooth sliding action between a slide pin and a support cylinder and to maintain a sealing property between them in a pin slide type disc brake.

[Means for Solving the Problems] In order to solve the above problems and achieve the above object, in the pin slide type disc brake of the present invention, a disc rotor that rotates with wheels and a disc rotor that rotates with the wheel are used. A pair of friction pads facing each other, a mounting bracket slidably supporting the pair of friction pads parallel to the rotation axis of the disk rotor and fixed to a fixed portion of the vehicle, and slidable on the mounting bracket. A caliper which is mounted and presses each of the pair of friction pads toward the disc rotor, and a slide pin is provided on either one of the caliper and the mounting bracket, and the slide pin is surrounded and slid on the slide pin. A support cylinder that freely fits is provided on the other side. A tubular body slidably fitted to the slide pin and interposed between the support barrel and the slide pin; and an elastic member interposed between the barrel body and the support barrel. One of the opening ends is fixed to the slide pin, the other opening end is held between the tubular body and the support tube, and a dust boot surrounding the sliding portion of the slide pin is provided. .

It should be noted that the cylindrical body may be formed of oilless metal.

[Operation] According to the pin slide type disc brake described above, the disc rotor rotates together with the wheel between the pair of friction pads when the brake is not operated. When the brake is operated, the caliper slides on the mounting bracket, and the pair of friction pads are pressed in the direction of the disc rotor to come into contact with the disc rotor to generate a frictional force.

In this case, the sliding action of the support cylinder with respect to the slide pin is performed via the tubular body, and the slide pin does not directly contact the support cylinder. An elastic member is interposed between the support cylinder and the cylinder body, one opening end of the dust boot is fixed to the slide pin, and the other opening end is held between the support cylinder and the cylinder body. Therefore, the dust boot does not become a sliding resistance against the operation of the support cylinder.

[Embodiment] A preferred embodiment of the pin slide type disc brake of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, and FIGS. 2 and 3 show the entire structure.

First, in FIGS. 2 and 3, a caliper floating type pin slide type disc brake 10 is provided in parallel with a disc rotor 80 that rotates together with wheels (not shown). That is, the mounting bracket 20 is fixed to a non-rotating portion of the vehicle in parallel with the rotation surface of the disc rotor 80, and the caliper 40 is slidably arranged in parallel with the rotation axis of the disc rotor 80 with respect to the mounting bracket 20. There is.

As can be seen in FIG. 2, the mounting bracket 20
Is equipped with a first inner bracket 23 on the vehicle inner side and a first outer bracket 25 on the vehicle outer side via the disc rotor 80, and has a first torque receiving portion connected by a first arm portion 21. . Similarly, it has a second torque receiving portion including a second arm portion 22 that connects the second inner bracket 24 and the second outer bracket 26. The second torque receiving portion is located with a predetermined gap in the rotation direction of the disk rotor 80 with respect to the first torque receiving portion, and the first arm portion 21 and the second arm portion 22 are located outside the vehicle in the beam 29. Are linked by.
As shown in FIG. 3, the inner side of the vehicle of the mounting bracket 20 has a substantially U-shaped configuration in which the first torque receiving portion and the second torque receiving portion are connected by the frame 20a, and the first and second torque receiving portions are formed. Mounting holes 27 and 28 are formed near the portions, respectively. Bolts (not shown) are inserted into these mounting holes 27 and 28 to fix the mounting bracket 20 to the non-rotating portion of the vehicle.

An inner pad 31, which is a friction pad, is arranged between the first inner bracket 23 and the second inner bracket 24 in parallel with the disc rotor 80, and similarly, the first outer bracket 25.
An outer pad 32, which is a friction pad, is disposed between the second outer bracket 26 and the second outer bracket 26. That is, the inner pad 31
The outer pad 32 and the outer pad 32 are arranged so as to sandwich the disc rotor 80. The inner pad 31 is formed by joining a friction member 33 facing the plate surface of the disc rotor 80 to a back plate 35.
The outer pad 32 also has a similar structure and has a friction member 34 and a back plate 36.

The inner pad 31 and the outer pad 32 are plate members of substantially the same shape having a curved portion along the rotation direction of the disk rotor 80, and the back plate 36 has a length facing the curved portion as shown in FIG. Protrusions 36 on both sides extending from both ends
The back plate 35 has a and a protrusion 36b, and has the same structure.

The first outer bracket 25 and the second outer bracket 26 are provided with a guide groove 25a and a guide groove 26a which are opened so as to face each other. The guide groove 25a and the guide groove 26a are provided with a protrusion 36a and a protrusion of the back plate 36. 36b is fitted and the back plate 36 is slidably held in parallel with the rotation axis of the disk rotor 80.
The protrusions 36a and 36b and the guide grooves 25a and 26a face each other with a gap in the vertical and horizontal directions of FIG. 3, and springs 61 and 62 are interposed in these gaps. Has been done. The spring 61 is configured as a plate member so as to be fitted into the guide groove 25a, has a resilient portion 63, and is fixed to the first inner bracket 23 by a claw 65, and the spring 62 is also the same.

As shown in FIG. 2, a disc rotor is provided in the first torque receiving portion and the second torque receiving portion of the mounting bracket 20.
Slide pins 51 and 52 are provided on the inner side of the vehicle with respect to 80 and parallel to the rotation axis of the disk rotor 80. Although the slide pins 51 and 52 have different lengths but have the same structure, only the slide pin 51 will be described. Slide pin
51, a rib 55 is fitted into a bolt 53, and is screwed into a mounting hole provided in the mounting bracket 20. The caliper 40 is formed with a first support 41, which is a support cylinder according to the present invention, which surrounds the sleeve 55 and is slidably fitted into the sleeve 55. First support 41 and sleeve
A rubber bush 57, which is an elastic member according to the present invention, is interposed between the bush 55 and the bush 55, and a cylindrical body is provided between the bush 57 and the sleeve 55.
50 are installed. Dust boots 59 and 59a are mounted between both ends of the first support 41 in the axial direction and the sleeve 55, respectively. A second support 42, which is a support cylinder according to the present invention, is similarly fitted and inserted into the slide pin 52.

The detailed structure of the slide pin 51, the first support 41, etc. is apparent in FIG. That is, the sleeve of the slide pin 51
Ring grooves 55a and 55b are formed on the outer circumference of both ends of 55,
Annular grooves 41a, 41b are formed on the inner circumference of both ends of the first support 41. The tubular body 50 is fitted in the sleeve 55, and the bush 57 is housed between the tubular body 50 and the first support 41. The cylindrical body 50 in this embodiment is made of metal, for example, oilless metal is used. Then, the annular groove 41 of the first support 41
Both open ends of a bellows-shaped rubber dust boot 59 are fitted in a and the annular groove 55a of the sleeve 55. Similarly, the open end of the dust boot 59a is fitted in the annular grooves 41b, 55b. Therefore, the sliding range of the first support 41 on the sleeve 55 is covered and sealed by the dust boots 59, 59a. In this case, the open ends of the dust boots 59, 59a on the side where the dust boots 59, 59a are attached to the first support 41 do not contact the sleeve 55 and are held between the first support 41 and the tubular body 50.
Therefore, there is no need to worry about an increase in sliding resistance due to the expansion of the contact portion of the dust boots 59, 59a, and the width of the annular grooves 41a, 41b,
Alternatively, the shape of the open ends of the dust boots 59, 59a can be set arbitrarily. The bush 57 forms a fitting space for the open ends of the dust boots 59, 59a, and can absorb a tolerance or vibration between the first support 41 and the sleeve 55, and thus the bolt 53.

As described above, the caliper 40 is slidably supported on the mounting bracket 20 by the slide pins 51 and 52, and the caliper body 43 is located inside the vehicle with respect to the disc rotor 80. The caliper body 43 includes a mounting bracket 20 that is parallel to the rotation axis of the disc rotor 80 and faces the disc rotor 80 and has a substantially U shape.
A cylinder 43a that opens inside (see FIG. 3) is formed. As shown in FIG. 2, a cup-shaped piston 44 having an open end facing the disc rotor 80 is slidably fitted in the cylinder 43a. This allows
A pressure chamber 43b is formed between the bottom surface of the piston 44 and the cylinder 43a, and brake fluid is filled in the pressure chamber 43b via a port 43c.
It is configured to slide in the direction. Therefore, the back plate 35 of the inner pad 31 contacts the annular opening end of the piston 44.

The caliper body 43 has a substantially concentric circle with the disc rotor 80, and surrounds the outer periphery of the disc rotor 80 beyond the outer periphery of the disc rotor 80. Are facing each other,
The caliper body 43 is configured to be movable between the first arm portion 21 and the second arm portion 22. A bridge portion 45 is formed on the outer peripheral portion of the caliper body 43 in parallel with the rotation axis of the disc rotor 80, that is, extending in a direction orthogonal to the plate surfaces of the inner pad 31 and the outer pad 32 and covering the inner pad 31 and the outer pad 32. There is. Then, a pair of hook-shaped claw portions 46 extending in the rotation axis direction of the disc rotor 80 on the vehicle outer side with respect to the disc rotor 80 and interposed between the beam 29 of the mounting bracket 20 and the outer pad 32 are formed. Has been done. The inner surface of the claw portion 46 is in contact with the back plate 36 of the outer pad 32. Therefore, the bridge portion 45 is assembled so as to straddle the inner pad 31 and the outer pad 32 arranged side by side via the disc rotor 80.

The operation of the disc brake 10 having the above configuration will be described. In the normal state where the brake is not operated, the caliper body 43 is close to the disc rotor 80 and the pressure chamber 43b.
Has been reduced and the piston 44 has retracted. Therefore, gaps are formed between the inner pad 31, the outer pad 32, and the disc rotor 80, and the disc rotor 80 is not restrained.

When a brake pedal (not shown) is pressed and brake fluid pressure is applied to the pressure chamber 43b of the caliper 40 from a brake fluid pressure control device (not shown) such as a master cylinder, the piston 44 moves inside the cylinder 43a. Slide in the direction of the disk rotor 80. Therefore, the back plate 35 of the inner pad 31 is pressed against the annular end portion of the piston 44, the friction member 33 contacts the disc rotor 80, and a frictional force is generated between the two.
Braking force acts on 80.

On the other hand, when the piston 44 is pressed toward the disc rotor 80, a reaction acts on the caliper 40, and the first support 41 and the second support 41
The support 42 slides on the slide pins 51 and 52 to move the caliper body 43 inward of the vehicle.

Regarding the sliding action of the first support 41 and the second support 42, as will be more apparent with reference to FIG. 1, the first support 41 interlocks with the tubular body 50 via the bush 57, and the tubular body 50 and the sleeve. Smooth sliding action is achieved by the metal contact between 55. Then, the dust boot 59 expands and the dust boot 59a contracts to follow the first support 41.

As a result, the claw portion 46 connected to the caliper body 43 via the bridge portion 45 moves in the direction of the disc rotor 80, and the outer pad 32 comes into contact with the disc rotor 80 to generate a frictional force.

Then, when the brake operation is completed and the brake fluid pressure is reduced, the piston 44 retracts, the caliper body 43 approaches the disc rotor 80, and the inner pad 31 and the outer pad.
32 returns to the initial position separated from the disc rotor 80.

FIG. 4 shows a slide pin 55 according to another embodiment of the present invention.
1 shows the structure of the support 411, etc., and relates to a so-called collet type disc brake. That is, the slide pin 551 is fixed to a caliper (corresponding to the caliper 40 in FIG. 1) and slides in a support 411 provided in a mounting bracket (corresponding to the mounting bracket 20 in FIG. 1). It is applied to the disc brake of. Therefore, since the basic structure of the disc brake is the same as that of the embodiment shown in FIG. 1, its explanation is omitted.

As is clear from FIG. 4, the collet type has only one dust boot 59 and the slide pin 55.
1. A cylindrical body 501 made of, for example, a synthetic resin that is slidably fitted to this
Also, a rubber bush 571 is housed in the support 411 of the bottomed cylindrical body. Then, one opening end of the dust boot 59 is fitted in the annular groove 411a formed on the inner periphery of the opening end of the support 411. The other open end of the dust boot 59 is fitted into an annular groove 551a formed on the outer circumference of the slide pin 551.

When the slide pin 551 slides in the support 411, a smooth sliding action is performed between the slide pin 551 and the cylindrical body 501. At this time, one open end of the dust boot 59 is held between the annular groove 411a of the support 411 and the tubular body 501 to maintain the sealed state. The bush 571 can absorb the tolerance between the mounting bracket and the caliper, or can absorb the vibration.

It should be noted that the above embodiment applies the present invention to two types of pin slide type disc brakes, but can of course be applied to other pin slide type disc brakes.

[Advantages of the Invention] As described above, according to the present invention, in the pin slide type disc brake, the cylinder is slidably fitted to the slide pin and is interposed between the support cylinder and the slide pin. , An elastic member is interposed between the cylindrical body and the support cylinder, and the dust boot surrounding the sliding portion of the slide pin is
One of the opening ends is fixed to the slide pin, and the other opening end is held between the tubular body and the support tube, so that the sliding portion and the sealing portion are separated and smooth. A sliding action can be secured and stable sealing property can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a supporting cylinder portion of an embodiment of a pin slide type disc brake of the present invention, FIG. 2 is a partial sectional plan view of an embodiment of the present invention, and FIG. 3 is a partial sectional front view of the same. FIG. 4 is a cross-sectional view of a supporting cylinder portion according to another embodiment of the present invention. 20 …… Mounting bracket 31 …… Inner pad (friction pad), 32 …… Outer pad (friction pad), 40 …… Caliper, 41 …… First support (support cylinder), 42 …… Second support (support cylinder) , 50 …… Cylinder, 51 …… Slide pin, 55 …… Sleeve, 57 …… Bush (elastic member), 59,59a …… Dust boot

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Katagiri 1 Toyota-cho, Toyota-shi, Aichi Prefecture Toyota Motor Corporation (72) Inventor Kenichi Nakamura 1-cho, Toyota-shi, Aichi Toyota Motor Corporation ( 56) References JP-A-62-251530 (JP, A) JP-B-62-12408 (JP, B2)

Claims (2)

[Scope of utility model registration request] 1. A disk rotor rotating with a wheel, and a pair of friction pads facing each other with the disk rotor interposed therebetween.
A mounting bracket that slidably supports the pair of friction pads parallel to the rotation axis of the disk rotor and that is fixed to a fixed portion of the vehicle, and a pair of friction pads that are slidably mounted on the mounting bracket. A caliper that presses each of them toward the disc rotor, a slide pin is provided on either one of the caliper and the mounting bracket, and a support cylinder that surrounds the slide pin and is slidably fitted to the slide pin is provided. In a pin slide type disc brake provided on the other side, a cylinder body slidably fitted to the slide pin and interposed between the support cylinder and the slide pin, and the cylinder body and the support cylinder. An elastic member interposed between and,
One end of the opening is fixed to the slide pin, the other end of the opening is held between the cylindrical body and the support cylinder, and a dust boot surrounding the sliding portion of the slide pin is provided. Pin slide type disc brake. 2. The pin slide type disc brake according to claim 1, wherein the cylindrical body is made of an oilless metal.