JP2008095817A - Disk brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk brake device which reduces uneven wear of a brake pad caused by the inclination of a floating type caliper. <P>SOLUTION: Slide pins 3A, 3B are supported by slidably fitting intermediate parts thereof to guide holes 2B, 2D formed in slide support parts 2A, 2C of a mounting 2, and coupled to the caliper 4 in a state of being supported at both ends by keeping one ends respectively fixed to fixed arms 4D, 4D of the caliper 4 and the other ends respectively supported by support arms 4F, 4G of the calliper 4. When a bending moment in the direction shown by the arrow acts on the caliper 4 through the medium of an inner brake pad 5 and outer brake pad 6 from a disk rotor 1 at braking, the inclinations of a pair of slide pins 3A, 3B are controlled to suppress the inclination of the caliper 4 and to reduce the uneven wear of a pad member 5A in the inner brake pad 5 and a pad member 6A in the outer brake pad 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disc brake device, and more particularly to a disc brake device having a floating caliper.

  As a disc brake device, a disc brake device having a so-called floating caliper is generally known. This type of disc brake device has a structure in which a caliper arranged so as to straddle the outer periphery of the disc rotor is slidably supported in parallel with the rotation axis of the disc rotor with respect to the mounting via a pair of slide pins. ing. One end (inner end) of such a floating caliper is provided with a cylinder portion into which a piston that presses the brake pad against the inner surface of the disk rotor is inserted, and the other end portion (outer end portion) is provided at the other end portion (outer end portion). Are provided with claw portions for pressing the brake pads against the outer surface of the disc rotor.

In a disc brake device having such a floating caliper, one end of the pair of slide pins is usually connected in a cantilevered state near both sides of the cylinder portion of the caliper and includes the other end. The intermediate portion is slidably fitted to and supported by a pair of guide holes formed in the mounting (see, for example, Patent Document 1).
JP-A-7-139570

  By the way, in the disc brake device provided with a floating caliper generally known in the art, as shown in FIG. 9, the floating caliper is applied during braking when the brake pads BP and BP are pressed on both sides of the disc rotor DR. A bending moment in the direction of the arrow along the rotational direction of the disk rotor DR acts on the CP with the heavy cylinder portion CL as a center. Then, due to the bending moment in the direction of the arrow, the pair of slide pins SP is greatly inclined and the caliper CP is tilted. As a result, the force with which the caliper CP presses each brake pad BP on both sides of the disc rotor DR becomes uneven. There is a problem that uneven wear occurs in each brake pad BP.

  Accordingly, an object of the present invention is to provide a disc brake device that can suppress uneven wear of a brake pad due to tilting of a floating caliper.

  A disc brake device according to the present invention is a disc brake device in which a caliper that presses a brake pad against a disc rotor is supported so as to be slidable in parallel with the rotation axis of the disc rotor via a slide pin with respect to the mounting. The pin is slidably supported in a both-end supported state.

  In the disc brake device according to the present invention, since the slide pin is slidably supported in a both-end supported state, the caliper is prevented from tilting during braking, and as a result, uneven wear of the brake pad is suppressed.

  In the disc brake device of the present invention, the slide pin may have a structure in which both end portions are connected to the caliper and the intermediate portion is slidably supported by the mounting. Further, the slide pin can be structured such that both end portions are connected to the mounting and the intermediate portion is slidably supported by the caliper.

  According to the disc brake device of the present invention, since the slide pin is slidably supported in the both-end supported state, the caliper can be prevented from tilting during braking, and as a result, uneven wear of the brake pad can be suppressed. .

  Embodiments of a disc brake device according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a plan view of the disc brake device according to the first embodiment of the present invention as a partial cross section viewed from the outer peripheral side of the disc rotor, and FIG. 2 is a cross section of the floating caliper shown in FIG. FIG. 3 is a partial plan view of a floating caliper showing a support structure of the slide pin shown in FIG. 1.

  The disc brake device according to the first embodiment is configured for a vehicle, for example. As shown in FIGS. 1 and 2, a disc rotor 1 that rotates integrally with a wheel (not shown), a suspension part of a vehicle body, and the like. A mounting 2 that is supported by (not shown) and is disposed so as to straddle the outer periphery of the disk rotor 1, and slides parallel to the rotation axis of the disk rotor 1 with respect to the mounting 2 via a pair of slide pins 3 A and 3 B. And a floating caliper 4 supported movably.

  The floating caliper 4 is disposed across the outer periphery of the disk rotor 1 as shown in FIG. At one end (inner end) of the caliper 4, a cylinder portion 4B is formed in which a piston 4A facing the inner rotor surface 1A formed on the outer peripheral portion of the disc rotor 1 is fitted. Further, a pair of claw portions 4C and 4C are formed at the other end portion (outer end portion) of the caliper 4 so as to face the outer rotor surface 1B formed on the outer peripheral portion of the disc rotor 1.

  An inner brake pad 5 is disposed between the piston 4 </ b> A of the caliper 4 and the inner rotor surface 1 </ b> A of the disk rotor 1. An outer brake pad 6 is disposed between the claw portions 4C and 4C of the caliper 4 and the outer rotor surface 1B of the disc rotor 1.

  The inner brake pad 5 has a structure in which a back metal 5B is joined to a pad member 5A, the back metal 5B faces the piston 4A of the caliper 4, and the pad member 5A faces the inner rotor surface 1A of the disc rotor 1. Yes. Similarly, the outer brake pad 6 has a structure in which a back metal 6B is joined to a pad member 6A, the back metal 6B faces the claws 4C and 4C of the caliper 4, and the pad member 6A is an outer rotor of the disc rotor 1. It faces the surface 1B.

  Here, the cylinder portion 4B of the caliper 4 is configured to advance the piston 4A in parallel with the rotational axis of the disc rotor 1 in accordance with brake hydraulic pressure supplied via a brake pipe (not shown) of the vehicle. . As the piston 4A advances, the pad member 5A of the inner brake pad 5 is pressed against the inner rotor surface 1A of the disc rotor 1, and the reaction force causes the outer brake pad 6 to be moved by the claws 4C and 4C of the caliper 4. The pad member 6 </ b> A is pressed against the outer rotor surface 1 </ b> B of the disk rotor 1.

  A pad shim 5C is attached to the back metal 5B of the inner brake pad 5 in order to suppress high-frequency vibrations generated by the inner brake pad 5 and the outer brake pad 6 during braking to prevent so-called brake noise. A pad shim 6C is attached to the back metal 6B of the pad 6.

  Here, as shown in FIG. 1, a pair of fixed arms 4D and 4E project from both sides of the cylinder portion 4B of the caliper 4, and one end of the slide pins 3A and 3B is provided on the fixed arms 4D and 4E. The parts (base end parts) are fixed by set bolts 3C and 3C, respectively. Further, a pair of support arms 4F and 4G are provided on both sides of the claw portions 4C and 4C of the caliper 4, and the other ends (tip portions) of the slide pins 3A and 3B are provided on the support arms 4F and 4G. Are respectively supported by fitting.

  That is, as shown in FIG. 3, the leading slide pin 3A located on the rear side in the rotational direction of the disk rotor 1 has one end (base end) fixed to the fixed arm 4D and the other end (tip end). ) Is supported by the support arm 4 </ b> F, so that it is coupled to the caliper 4 in a both-end supported state. The trailing-side slide pin 3B located on the front side in the rotational direction of the disk rotor 1 is also connected to the caliper 4 in a double-sided support state.

  On the other hand, as shown in FIG. 1, the mounting 2 is provided with a sliding support portion 2A projecting between the fixed arm 4D and the support arm 4F of the caliper 4, and formed on the sliding support portion 2A. An intermediate portion of the leading slide pin 3A is slidably fitted into the guide hole 2B. Further, the mounting 2 is provided with a sliding support portion 2C projecting between the fixed arm 4E and the support arm 4G of the caliper 4, and a guide hole 2D formed in the sliding support portion 2C is provided in the guide hole 2D. The intermediate portion of the sliding pin 3B on the trailing side is slidably fitted.

  In addition, boots 8 and 8 are disposed between one sliding support portion 2A of the mounting 2 and the fixed arm 4D and support arm 4F of the caliper 4 so as to cover the exposed portion of the one slide pin 3A. Similarly, boots 8, 8 are disposed between the other sliding support portion 2C of the mounting 2 and the fixed arm 4E and the support arm 4G of the caliper 4 to cover the exposed portion of the other slide pin 3B. .

  In the disc brake device of the first embodiment configured as described above, when a brake pedal of a vehicle (not shown) is depressed, brake hydraulic pressure corresponding to the depression operation is supplied to the cylinder portion 4B of the caliper 4. Then, the piston 4 </ b> A advances from the cylinder portion 4 </ b> B and pushes the back metal 5 </ b> B of the inner brake pad 5 to press the pad member 5 </ b> A against the inner rotor surface 1 </ b> A of the disc rotor 1.

  At that time, the floating caliper 4 receiving the reaction force from the piston 4A is parallel to the rotational axis of the disk rotor 1 by the pair of slide pins 3A and 3B sliding along the guide holes 2B and 2D of the mounting 2. Slide. The caliper 4 presses the pad member 6 </ b> A against the outer rotor surface 1 </ b> B of the disc rotor 1 by pressing the back metal 6 </ b> B of the outer brake pad 6 with the claw portions 4 </ b> C and 4 </ b> C.

  In this way, the pad member 5A of the inner brake pad 5 is pressed against the inner rotor surface 1A of the disc rotor 1 and brought into frictional contact, and the pad member 6A of the outer brake pad 6 is pressed against the outer rotor surface 1B of the disc rotor 1 to cause friction. During braking that comes into contact, the rotational force of the disk rotor 1 acts on the floating caliper 4 via the inner brake pad 5 and the outer brake pad 6. As a result, a bending moment in the direction of the arrow (see FIG. 1) along the rotational direction of the disk rotor 1 acts on the floating caliper 4 around the cylinder portion 4B which is heavy.

  However, in the disc brake device of the first embodiment, both ends of the leading slide pin 3A are connected to the fixed arm 4D and the support arm 4F of the caliper 4 in a supported state, and the trailing slide pin 3B is Both end portions are also connected to the fixed arm 4E and the support arm 4G of the caliper 4 in a state where both ends are supported. For this reason, even when the bending moment in the direction of the arrow shown in FIG. 1 acts on the floating caliper 4 during braking, the tilt of the pair of slide pins 3A and 3B is suppressed, and the tilt of the caliper 4 is suppressed.

  As a result, the piston 4A of the caliper 4 uniformly presses the back metal 5B of the inner brake pad 5 to uniformly press the pad member 5A against the inner rotor surface 1A of the disc rotor 1, and the claw portions 4C, 4C of the caliper 4 Presses the back plate 6B of the outer brake pad 6 uniformly to press the pad member 6A uniformly against the outer rotor surface 1B of the disk rotor 1. In this way, uneven wear of the pad member 5A of the inner brake pad 5 and the pad member 6A of the outer brake pad 6 is suppressed.

  That is, according to the disc brake device of the first embodiment, the tilt of the floating caliper 4 can be suppressed by suppressing the tilt of the pair of slide pins 3A and 3B during braking. Uneven wear of the pad member 5A and the pad member 6A of the outer brake pad 6 can be suppressed.

  Next, a disc brake device according to a second embodiment of the present invention will be described with reference to FIGS. This disc brake device is obtained by changing the support structure of the pair of slide pins 3A, 3B in the disc brake device of the first embodiment shown in FIGS. 1 to 3, and other structural portions are particularly changed. Therefore, the same reference numerals as those shown in FIGS.

  Here, as shown in FIGS. 4 and 5, the mounting 2 is provided with a pair of fixed arms 2 </ b> E and 2 </ b> F that protrude from both sides of the cylinder portion 4 </ b> B of the caliper 4. One end portions (base end portions) of the slide pins 3A and 3B are fixed by set bolts 3C and 3C, respectively. Further, the mounting 2 is provided with a pair of support arms 2G and 2H projecting on both sides of the claws 4C and 4C of the caliper 4, and the other ends of the slide pins 3A and 3B are provided on the support arms 2G and 2H. Each part (tip part) is fitted and supported.

  That is, the slide pin 3A on the leading side has one end (base end) fixed to the fixed arm 2E and the other end (tip) supported by the support arm 2G, so that the mounting 2 is supported at both ends. It is connected with. Similarly, the trailing slide pin 3B has one end (base end) fixed to the fixed arm 2F and the other end (tip end) supported by the support arm 2H, so that the mounting 2 can be held at both ends. Connected in a supported state.

  On the other hand, the caliper 4 is provided with a sliding support portion 4H protruding between the fixed arm 2E and the support arm 2G of the mounting 2 (see FIG. 6), and is formed on the sliding support portion 4H. An intermediate portion of the leading slide pin 3A is slidably fitted into the guide hole 4I. Similarly, the caliper 4 is provided with a sliding support portion 4J projecting between the fixed arm 2F and the support arm 2H of the mounting 2, and is inserted into a guide hole 4K formed in the sliding support portion 4J. The intermediate part of the sliding pin 3B on the trailing side is slidably fitted.

  In the disc brake device of the second embodiment configured as described above, the piston 4A advances from the cylinder portion 4B of the caliper 4 and presses the pad member 5A of the inner brake pad 5 against the inner rotor surface 1A of the disc rotor 1. At this time, the floating caliper 4 receiving the reaction force from the piston 4A rotates the disk rotor 1 with respect to the mounting 2 by sliding the pair of sliding support portions 4H and 4J along the pair of slide pins 3A and 3B. Slide parallel to the axis. The caliper 4 presses the pad member 6 </ b> A of the outer brake pad 6 against the outer rotor surface 1 </ b> B of the disc rotor 1 with the claw portions 4 </ b> C and 4 </ b> C.

  During such braking, a bending moment in the direction of the arrow (see FIG. 4) along the rotational direction of the disk rotor 1 acts on the floating caliper 4 around the heavy cylinder portion 4B.

  However, in the disc brake device of the second embodiment, both ends of the sliding pin 3A on the leading side are coupled to the fixed arm 2E and the supporting arm 2G of the mounting 2 in a supported state, and the sliding pin 3B on the trailing side is connected. Both end portions are also connected to the fixed arm 2F and the support arm 2H of the mounting 2 in a both-end supported state. For this reason, even when a bending moment in the direction of the arrow shown in FIG. 4 acts on the floating caliper 4 during braking, the tilt of the pair of slide pins 3A and 3B is suppressed and the tilt of the caliper 4 is suppressed.

  That is, according to the disc brake device of the second embodiment, the tilt of the pair of slide pins 3A and 3B during braking can be suppressed and the tilt of the floating caliper 4 can be suppressed. Uneven wear of the pad member 5A and the pad member 6A of the outer brake pad 6 can be suppressed.

  The disc brake device of the present invention is not limited to the above-described embodiments. For example, the disc brake device of the first embodiment shown in FIG. 1 can be changed to the disc brake device shown in FIG. 7 or FIG.

  The disc brake device shown in FIG. 7 eliminates the support arm 4G of the caliper 4 shown in FIG. 1, and the fixing arm 4E of the caliper 4 is fixed to one end (base end) of the sliding pin 3B on the trailing side with a set bolt 3C. The other structure is the same as that of the disc brake device shown in FIG.

  In this disk brake device, both ends of the leading slide pin 3A are coupled to the fixed arm 4D and the support arm 4F of the caliper 4 in a state of being supported at both ends. Therefore, the disk brake of the first embodiment shown in FIG. The same effects as the device can be achieved.

  On the other hand, the disc brake device shown in FIG. 8 eliminates the support arm 4F of the caliper 4 shown in FIG. 1, and fixes one end (base end) of the slide pin 3A on the leading side to the fixing arm of the caliper 4 with a stop bolt 3C. 4D is fixed in a cantilevered state, and the other structure is the same as that of the disc brake device shown in FIG.

  In this disc brake device, both end portions of the sliding pin 3B on the trailing side are coupled to the fixed arm 4E and the support arm 4G of the caliper 4 in a state where both ends are supported, so the disc of the first embodiment shown in FIG. The same operation effect as a brake device can be produced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a disc brake device according to a first embodiment of the present invention as viewed from the outer peripheral side of a disc rotor with a partial cross section. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 schematically showing a cross-sectional structure of the floating caliper shown in FIG. 1. FIG. 2 is a partial plan view of a floating caliper showing a support structure for a slide pin shown in FIG. 1. It is the top view which looked at the disc brake device which concerns on 2nd Embodiment from the outer peripheral side of the disc rotor by making a partial cross section. FIG. 5 is a view taken in the direction of arrow V in FIG. 4. FIG. 5 is a partial plan view of a floating caliper showing the support structure of the slide pin shown in FIG. 4. It is a top view corresponding to FIG. 1 which shows the 1st modification of the disc brake apparatus shown in FIG. FIG. 10 is a plan view corresponding to FIG. 1 and showing a second modification of the disc brake device shown in FIG. 1. It is the top view which looked at the disc brake device concerning a conventional example from the perimeter side of a disc rotor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc rotor, 1A ... Inner rotor surface, 1B ... Outer rotor surface, 2 ... Mounting, 2A, 2C ... Sliding support part, 2B, 2D ... Guide hole, 3A, 3B ... Slide pin, 3C ... Set bolt, 4 ... Floating caliper, 4A ... Piston, 4B ... Cylinder part, 4C ... Claw part, 4D, 4E ... Fixing arm, 4F, 4G ... Support arm, 5 ... Inner brake pad, 5A ... Pad member, 5B ... Back metal, 5C ... pad shims, 6 ... outer brake pads, 6A ... pad members, 6B ... back metal, 6C ... pad shims.

Claims (3)

A disc brake device in which a caliper that presses a brake pad against a disc rotor is slidably supported in parallel with the rotation axis of the disc rotor via a slide pin with respect to the mounting,
The disc brake device, wherein the slide pin is slidably supported in a both-end supported state.   2. The disc brake device according to claim 1, wherein both ends of the slide pin are connected to the caliper and an intermediate portion is slidably supported by the mounting.   2. The disc brake device according to claim 1, wherein both ends of the slide pin are coupled to the mounting, and an intermediate portion is slidably supported by the caliper.

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