JP2007107591A - Disk brake device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake device for a vehicle which suppresses brake noise at non-braking, and brake vibration at braking. <P>SOLUTION: A first spring piece 8D formed on a pad shim 8 applies a reaction force downward along a rotor face of a disk rotor 2 to a pawl part 5C on the lower side of a caliper 5 so that a moment in a reverse direction from the moment acting on the caliper 5 at non-braking acts on the caliper 5, and a second spring piece 8E formed on the pad shim 8 applies a parallel reaction force in the direction of a rotary shaft of the disk rotor 2 to a pawl part 5B on the upper side of the caliper 5. Inclination of the caliper 5 and slide pins 4A, 4B are positively suppressed thereby, and occurrence of brake noise at non-braking and brake vibration at braking are suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle disc brake device that is installed in a vehicle as a braking device.

  2. Description of the Related Art Conventionally, a vehicular disc brake device that has a so-called floating caliper is generally known as a vehicular disc brake device that obtains a braking force by pressing a brake pad against a rotor surface of a disc rotor and frictional contact between both. This floating caliper is used as a means for pressing a pair of left and right brake pads against the left and right rotor surfaces of a disc rotor, for example, a cylinder portion in which a piston that presses one brake pad is inserted and the other brake pad is pressed. And a pair of claw portions that support the mounting so as to be slidable in a direction along the rotation axis of the disk rotor via a pair of slide pins (see, for example, Patent Document 1).

Also, in this type of vehicle disc brake device, in order to prevent so-called brake squeal noise by suppressing high-frequency vibration generated by the brake pad during braking, a pad shim having a vibration damping effect is attached to the back pad of the brake pad. (For example, refer to Patent Document 2).
JP 2002-39233 A JP-A-7-103269

  By the way, in a floating caliper generally known in the past, a heavy cylinder portion is usually arranged on the side opposite to a slide pin that is slidably fitted into a mounting guide hole. The slide pin is fitted in the mounting guide hole with a predetermined clearance.

  For this reason, when the disc brake device is not braked, the caliper has a moment acting on the mounting guide hole due to the gravity acting on the center of gravity near the cylinder, and this moment causes the slide pin to tilt together with the caliper and the mounting. A twist occurs between the guide hole and the guide hole. And since the twisted slide pin acts as a spring, there is a problem that the entire caliper vibrates and contributes to so-called brake squeal.

  Further, when the caliper is tilted, the pad member of the brake pad may be tilted and slidably contact the rotor surface of the disc rotor, and the drag causes a difference in thickness on the rotor surface of the disc rotor. As a result, the disc brake device There is also a problem that so-called brake vibration occurs during braking.

  Therefore, an object of the present invention is to provide a vehicle disc brake device that can suppress brake squeal during non-braking and brake vibration during braking.

  In the vehicle disc brake device according to the present invention, the caliper that presses the brake pad against the disc rotor is supported so as to be slidable in the direction along the rotation axis of the disc rotor with respect to the mounting via the slide pin. Is a disc brake device in which a pad shim is attached, wherein the pad shim facing the upper and lower claw portions of the caliper is formed with a spring piece to be applied to the lower claw portion.

  In the vehicle disc brake device according to the present invention, the downward reaction force along the rotor surface of the disc rotor is applied to the lower claw portion of the caliper against the moment that the spring piece formed on the pad shim acts on the caliper during non-braking. Therefore, the inclination of the caliper and the slide pin is suppressed.

  In the disc brake device for a vehicle according to the present invention, the pad shim facing the upper and lower claw portions of the caliper is provided with a second spring piece that applies a reaction force parallel to the direction of the rotation axis of the disc rotor to the upper claw portion. Can be formed.

  In this case, when the spring piece formed on the pad shim applies a downward reaction force along the rotor surface of the disk rotor to the lower claw portion of the caliper against the moment acting on the caliper, the second piece formed on the pad shim. The spring pieces of the caliper work against the moment acting on the caliper so as to apply a reaction force parallel to the direction of the rotation axis of the disc rotor to the upper claw portion of the caliper, so that the caliper and the slide pin are further inclined. Suppressed reliably.

  In the vehicle disc brake device according to the present invention, the downward reaction force along the rotor surface of the disc rotor is applied to the lower claw portion of the caliper against the moment that the spring piece formed on the pad shim acts on the caliper during non-braking. Therefore, the inclination of the caliper and the slide pin is suppressed.

  Therefore, according to the disc brake device for a vehicle of the present invention, it is possible to suppress brake squeal during non-braking due to vibration of the entire caliper due to twisting of the slide pin. In addition, it is possible to suppress the occurrence of brake vibration during braking due to the pad member of the brake pad sliding on the rotor surface of the disc rotor due to the caliper tilting.

  In the vehicle disc brake device of the present invention, a second spring piece for applying a lateral reaction force along the rotation axis of the disc rotor to the upper claw portion is formed on the pad shim facing the upper and lower claw portions of the caliper. If the second spring piece cooperates with the spring piece formed on the pad shim, a reaction force parallel to the direction of the rotation axis of the disc rotor is applied to the upper claw portion of the caliper against the moment acting on the caliper. Therefore, the caliper and the slide pin are more reliably restrained from tilting. Therefore, in this case, it is possible to reliably suppress the occurrence of brake squeal during non-braking and the occurrence of brake vibration during braking.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a vehicle disc brake device according to the present invention will be described with reference to the drawings. In the drawings to be referred to, FIG. 1 is a perspective view showing an external appearance of a vehicle disc brake device according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional structure of a caliper of the vehicle disc brake device shown in FIG. FIG. 3 is a front view of one pad shim facing the claw portion of the caliper shown in FIG.

  A vehicle disc brake device according to an embodiment is supported by a disc rotor 2 that is fixed to an axle hub 1 and rotates together with a suspension part of a vehicle body (not shown), for example, as shown in FIG. The mounting rotor 3 is disposed so as to straddle the outer periphery of the disk rotor 2, and the disk rotor 2 is rotated with respect to the mounting 3 via a pair of slide pins 4A and 4B. And a floating caliper 5 slidably mounted in a direction along the axis.

  As shown in FIG. 2, the caliper 5 has a cylinder portion 5A facing the inner rotor surface 2A formed on the outer periphery of the disc rotor 2, and a pair of claw portions 5B and 5C facing the outer rotor surface 2B. A piston 5D is inserted into the cylinder portion 5A. The piston 5D is configured to advance and retract in parallel with the rotation axis of the disc rotor 2 in accordance with brake hydraulic pressure supplied to the cylinder portion 5A via a vehicle brake pipe (not shown).

  Here, in the disc brake device shown in FIG. 1, the caliper 5 is disposed in the vicinity of the rear upper part of the outer peripheral portion of the disc rotor 2 together with the mounting 3, so that the claw portions 5 </ b> B and 5 </ b> C of the caliper 5 The claw portion 5B is disposed above the claw portion 5C. A brake pad 6 is arranged between the claws 5B, 5C of the caliper 5 arranged in this way and the outer rotor surface 2B of the disc rotor 2, and is fitted into the cylinder part 5A of the caliper 5. A brake pad 7 is disposed between the piston 5 </ b> D and the inner rotor surface 2 </ b> A of the disk rotor 2.

  The brake pads 6 and 7 have a structure in which pad members 6B and 7B are joined to the back metal 6A and 7A. One brake pad 6 has the back metal 6A facing the claws 5B and 5C of the caliper 5, and the pad member 6B. Is facing the outer rotor surface 2 </ b> B of the disk rotor 2. In the other brake pad 7, the back metal 7 </ b> A faces the piston 5 </ b> D fitted into the cylinder portion 5 </ b> A of the caliper 5, and the pad member 7 </ b> B faces the inner rotor surface 2 </ b> A of the disc rotor 2.

  The brake pads 6 and 7 having such a structure are restricted in movement in the rotational direction of the disk rotor 2 and input in the rotational axis direction of the disk rotor 2 so that torque in the rotational direction of the disk rotor 2 is input to the mounting 3. Is mounted on the mounting 3 in a movable state.

  Here, a pad shim 8 is attached to the back metal 6A of one brake pad 6 in order to suppress high-frequency vibration generated by the brake pads 6 and 7 during braking to prevent so-called brake squeal noise. 7 has a pad shim 9 attached thereto.

  The pad shim 8 has a front shape as shown in FIG. 3 corresponding to the back metal 6A of the brake pad 6, and a clip piece 8A formed at the center of the upper edge portion and clips formed at the left and right sides of the lower edge portion. The pieces 8B and 8C are configured to be hooked on the back metal 6A of the brake pad 6. Although not shown, the pad shim 9 is configured in substantially the same manner as the pad shim 8.

  Here, the pad shim 9 is formed flat as in the conventional example, whereas the pad shim 8 is used to cancel the moment acting on the caliper 5 during non-braking as shown in FIGS. A first spring piece 8D and a second spring piece 8E are cut out.

  The first spring piece 8D applies a reaction force in the direction indicated by the arrow to the lower claw portion 5C of the caliper 5 shown in FIG. 1, that is, a downward reaction force along the rotor surface 2B of the disk rotor 2. As shown in FIGS. 3 and 4, the distal end portion is cut and raised from the base end portion located at the center portion in the longitudinal direction of the pad shim 8 toward the lower claw portion 5C. The distal end portion of the first spring piece 8D is bent and elastically contacted with the inner side surface of the claw portion 5C so as to press the lower claw portion 5C downward.

  The second spring piece 8E applies a reaction force parallel to the direction of the rotation axis of the disc rotor 2 to the upper claw portion 5B of the caliper 5 shown in FIG. 1, as shown in FIGS. Further, the distal end portion is cut and raised at a gentle angle from the base end portion located at the center portion in the longitudinal direction of the pad shim 8 toward the upper claw portion 5B. The distal end portion of the second spring piece 8E is in elastic contact with the inner surface of the upper claw portion 5B.

  In the disc brake device of one embodiment configured as described above, as schematically shown in FIG. 5, a pair of upper and lower slide pins 4A and a pair of upper and lower guide holes 3A and 3B formed in the mounting 3 are provided. 4B is slidably fitted with a predetermined clearance, and the caliper 5 is slidable in the direction of the rotation axis of the disk rotor 2 through the pair of upper and lower slide pins 4A and 4B.

  The caliper 5 is arranged such that a heavy cylinder portion 5A protrudes on the opposite side of the slide pins 4A and 4B, and the caliper 5 has a center of gravity on the cylinder portion 5A. For this reason, during non-braking, the caliper 5 is acted on by a downward moment centering on the vicinity of the inlets of the guide holes 3A and 3B, and the caliper 5 tends to tilt toward the cylinder portion 5A by this moment (see FIG. 6). ).

  However, in the disc brake device according to the embodiment, the first spring piece 8D formed on the pad shim 8 facing the upper and lower claws 5B and 5C of the caliper 5 is connected to the lower claw portion 5C on the rotor of the disc rotor 2. Applies a downward reaction force along the surface. At the same time, the second spring piece 8 </ b> E formed on the pad shim 8 applies a reaction force parallel to the direction of the rotation axis of the disk rotor 2 to the upper claw portion 5 </ b> B of the caliper 5.

  As a result, a moment in the direction opposite to the downward moment centering on the vicinity of the inlets of the guide holes 3A and 3B acts on the caliper 5, and the slide pins 4A and 4B together with the caliper 5 are as shown in FIG. Inclination to the cylinder portion 5A side is suppressed, and the situation where the slide pins 4A and 4B come into contact with the guide holes 3A and 3B of the mounting 3 at two points to cause twisting is suppressed (see FIG. 7).

  Therefore, according to the vehicle disc brake device of one embodiment, it is possible to reliably suppress brake squeal during non-braking due to vibration of the entire caliper 5 due to twisting of the slide pins 4A and 4B. Further, the brake members 6B and 7B of the brake pads 6 and 7 are brought into sliding contact with the inner rotor surface 2A and the outer rotor surface 2B of the disc rotor 2 due to the tilting of the caliper 5 to reliably generate brake vibration during braking. Can be suppressed.

  Further, the reaction force by the second spring piece 8E of the pad shim 8 acts on the center portion of the back metal 6A of the brake pad 6 so that the center portion of the pad member 6B always contacts the outer rotor surface 2B of the disc rotor 2 with a weak force. Therefore, it is possible to suppress the pad member 6B from being unevenly worn and the thickness difference from increasing.

  The vehicle disc brake device of the present invention is not limited to the above-described embodiments. For example, the second spring piece 8E shown in FIGS. 3 and 4 is not necessarily essential in the present invention, and may be omitted.

1 is a perspective view showing an appearance of a vehicle disc brake device according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view schematically showing a cross-sectional structure of a caliper of the vehicle disc brake device shown in FIG. 1. It is a front view of one pad shim which faces the claw part of the caliper shown in FIG. It is IV arrow line view of FIG. It is the front view made into the partial cross section which shows schematically the cylinder part and slide pin of the caliper shown in FIG. It is a schematic diagram which shows the behavior at the time of the non-braking of the caliper shown in FIG. FIG. 7 is a schematic diagram corresponding to FIG. 6 illustrating the operation of the pad shim in the vehicle disc brake device of the embodiment.

Explanation of symbols

2 Disc rotor 2A Inner rotor surface 2B Outer rotor surface 3 Mounting 3A, 3B Guide hole 4A, 4B Slide pin 5 Caliper 5A Cylinder part 5B Claw part 5C Claw part 5D Piston 6, 7 Brake pad 6A, 7A Back metal 6B, 7B Pad member 8 Pad shim 8D First spring piece 8E Second spring piece 9 Pad shim

Claims (2)

A caliper that presses the brake pad against the disc rotor is supported so as to be slidable in the direction along the rotation axis of the disc rotor via a slide pin with respect to the mounting, and a disc brake with a pad shim attached to the back metal of the brake pad A device,
The disc shim for a vehicle according to claim 1, wherein the pad shim facing the upper and lower claw portions of the caliper is formed with a spring piece for applying a downward reaction force along the rotor surface of the disc rotor to the lower claw portion. apparatus.   2. The vehicle disc brake device according to claim 1, wherein a reaction force parallel to the direction of the rotation axis of the disc rotor is applied to the upper claw portion of the pad shim facing the upper and lower claw portions of the caliper. A disc brake device for a vehicle, wherein two spring pieces are formed.

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