JPH1047394A - Disk brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the reduction of a product cost by dispensing with a torque receiving part on a support expensive in processing. SOLUTION: In a reverse plate 17 of a pair of friction pads 3, 4 arranged to be opposed by interposing a disk rotor 1, a piston 5 into contact with the reverse plate 17 and protruded parts 34, 38 engaged with a caliper pawl 8 to transmit brake torque to these piston 5 and caliper pawl 8 are equipped, and brake torque acting in each friction pad 3, 4 at brake operation time is received by a connection part between a caliper body 11 and a support 14 by a slide mechanism 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called floating caliper type disc brake device.

[0002]

2. Description of the Related Art Generally, a floating caliper type disk brake device for a vehicle includes a pair of friction pads which are arranged opposite to each other with a disk rotor interposed therebetween, and a piston which presses one of the pair of friction pads against the disk rotor. While the accommodated cylinder part is equipped on one end side,
A caliper body provided with a caliper claw for pressing the rear surface of the other friction pad on the other end side, and a support for supporting the caliper body slidably in the axial direction of the disk rotor via a slide mechanism. Become.
Then, the caliper body slides in the direction opposite to the advance direction of the piston by a reaction force when the piston presses one friction pad against the disk rotor by a brake operation, and the caliper pawls the other friction pad against the disk. By pressing against the rotor, a braking state is obtained in which the pair of friction pads sandwich the disk rotor.

[0003] The support generally has a pair of support arms arranged upright along both side edges of a pair of friction pads, and a substantially U-shaped joint formed by connecting lower ends of these support arms.
It has a character-like structure. A guide hole through which a guide pin, which is a component of the slide mechanism, can be inserted is formed above the pair of support arms of the support along the axial direction of the disk rotor. Equipped with mounting holes for fixing to etc.

A conventional floating caliper type disk brake device is disclosed in Japanese Patent Application Laid-Open No. 52-98869.
And Japanese Utility Model Publication No. 59-42508 and
As shown in Japanese Patent Application Laid-Open No. 2-101373, a pair of support arms of the above-mentioned support are provided with at least a torque receiving portion of an inner friction pad. The torque receiving portion comes into contact with the side surface of the friction pad during the braking operation and receives the braking torque. The torque receiving portion protrudes from the support arm toward the friction pad side, and has a structure in which the front end surface with which the friction pad comes into contact is cut flat. Consists of

[0005]

Since the support is relatively large and has a substantially U-shape, it is easy to cut the tip end face of the torque receiving portion. In addition, there is a problem that the processing cost is increased due to the formation of the torque receiving portion, and the product cost is increased.

The present invention has been made in view of the above circumstances,
A disc brake device capable of receiving a braking torque acting on each friction pad during a braking operation via a caliper body and a support by a slide mechanism through a caliper claw or a piston in contact with a back plate of the friction pad. Therefore, an object of the present invention is to reduce the product cost in place of the torque receiving portion of the conventional structure which increases the processing cost.

[0007]

A disk brake device according to the present invention for achieving the above object has a pair of friction pads opposed to each other with a disk rotor interposed therebetween, and one of the pair of friction pads. A caliper body provided with a cylinder portion containing a piston for pressing a friction pad against the disk rotor on one end side and a caliper claw on the other end side for pressing the back surface of the other friction pad;
A support for slidably supporting the caliper body in the axial direction of the disk rotor via a slide mechanism, wherein a reaction force when the piston presses the one friction pad against the disk rotor by a brake operation. The caliper body slides in a direction opposite to the advance direction of the piston, and the caliper pawl presses the other friction pad against the disk rotor,
A floating caliper type disc brake device in which a pair of friction pads sandwiches a disc rotor to obtain a braking state, wherein a back plate of the one friction pad with which the piston comes into contact is engaged with an inner diameter portion of the piston. A projection for transmitting a braking torque acting on the one friction pad to the piston during a braking operation is provided, and a back plate of the other friction pad with which the caliper claw abuts is provided.
Equipped with a convex portion that engages a concave portion formed in the caliper claw and transmits a braking torque acting on the other friction pad to the caliper claw during a braking operation, and a braking torque acting on each friction pad during a braking operation Is received by a connecting portion between the caliper body and the support by the slide mechanism.

Each friction pad is provided with a structure in which a projection provided on each back plate is engaged with an inner diameter portion of a piston or is engaged with a recess formed in a caliper claw to slide. Therefore, the braking torque acting on each friction pad during the braking operation is transmitted to the piston and the caliper claw via these projections, and can be received by the slide mechanism between the caliper body and the support.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake device according to the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 4 show an embodiment of a disc brake device according to the present invention. FIG. 1 is a plan view in which a part of the disc brake device is cut away, FIG. FIG. 3 is a sectional view taken along line BB of FIG. 2, and FIG.
FIG. This disc brake device 10
It is a floating caliper type equipped on the vehicle,
A pair of friction pads 3, 4 arranged opposite to each other with the disk rotor 1 rotating integrally with the wheel, and one of the pair of friction pads 3, 4 (the inner friction pad 3) is pressed against the disk rotor 1. A caliper body 11 provided at one end side with a cylinder portion 7 accommodating the piston 5 and a caliper body 11 provided at the other end side with a caliper claw 8 for pressing the back surface of the other (outer side) friction pad 4;
3 and a support 14 for supporting the caliper body 11 slidably in the axial direction of the disk rotor 1 (the direction of the arrow (a) in FIG. 1).

When the vehicle is moving forward, the disk rotor 1
Rotate in the direction of arrow (b). Each of the friction pads 3 and 4 is made of a lining portion 16 which is pressed against the surface of the disk rotor 1 to generate a predetermined frictional force, and a metal made of metal which is fixedly mounted on the back side of the lining portion 16 and functions as a mounting bracket or the like. And a back plate 17.

The piston 5 has a cylindrical shape with a bottom opening to the back plate 17 side of the friction pad 3, and the periphery of the opening is in contact with the back plate 17 of the friction pad 3. Then, the piston 5 is pushed toward the friction pad 3 by hydraulic oil (brake oil) supplied to the cylinder portion 7 in response to a brake operation.

As shown in FIGS. 2 and 4, the support 14 includes a pair of support arms 19 and 20 which are arranged upright along both side edges of the pair of friction pads 3 and 4, and the support arms 19. , 20 are connected to each other to form a substantially U-shaped structure. Then, as shown in FIG.
The upper part of the pair of support arms 19 and 20 is a component of the slide mechanism 13 and the caliper body 11
Guide holes 27 and 28 are formed along the axial direction of the disk rotor 1 so as to allow guide pins 24 and 25, which are substantial connecting portions between the disk rotor 1 and the support 14, to pass therethrough. As shown in FIG. 2, the support 14 is provided with a mounting hole 30 for fixing the support 14 to a vehicle body frame or the like.

As shown in FIG. 1, the guide pins 24 and 25 are threaded portions 24a and 25 which are screwed to the caliper body 11.
a at the base end side, and these screw portions 24a, 25
A pin portion 24b, 25b which is slidably fitted in the guide hole 27, 28 is provided at the end of the portion a.

The slide mechanism 13 is, as shown in FIG.
Guide pins 24, 25 slidably fitted in a pair of guide holes 27, 28 of the support 14, and extendable and contractable mounted between these guide pins 24, 25 and the openings of the respective guide holes 27, 28. Boots 32 and the like.

In this embodiment, the inner surface of the piston 5 is engaged (inscribed) with the back plate 17 of one of the friction pads 3 with which the piston 5 contacts, and acts on the friction pad 3 during a braking operation. Convex part 34 that transmits braking torque to piston 5
Is equipped. The convex portion 34 extends along the inner periphery of the piston 5 so as not to cause large backlash between the friction pad 3 and the piston 5 during the braking operation, and to withstand the braking torque acting on the friction pad 3. And several are equipped. In addition, the convex portion 34 may be configured as a single protrusion having an outer diameter dimension substantially matching the inner diameter of the piston 5.

The caliper claw 8 of the caliper body 11
Is engaged with a concave portion 36 formed in the caliper claw 8 to transmit a braking torque acting on the friction pad 4 to the caliper claw 8 during a braking operation. A part 38 is provided. The recess 36 is
It is provided at two places as through holes, and the protrusions 38 are provided at two places on the back plate 17 of the friction pad 4 corresponding to the mounting positions of the recesses 36. A spring member 40 is inserted in the gap between the convex portion 38 and the concave portion 36 to prevent rattling during a braking operation. This spring member 4
0 is obtained by press forming a plate material such as a spring steel plate.

In the disk brake device 10 configured as described above, when the piston 5 presses the friction pad 3 against the disk rotor 1 by the brake operation, the caliper body 11 is reversed in the direction of advance of the piston 5 by the reaction force at that time. By sliding in the direction, the caliper claw 8 presses the other friction pad 4 against the disk rotor 1 to obtain a braking state in which the pair of friction pads 3 and 4 sandwich the disk rotor 1.

The braking torque acting on each friction pad during the braking operation is determined by the protrusions 34, 38 provided on the back plate 17 of each friction pad 3, 4 from the piston on which these protrusions 34 are engaged. 5 and the caliper claw 8, and finally received by the connecting portion between the caliper body 11 and the support 14 by the slide mechanism 13.

Therefore, it is not necessary to form a torque receiving portion of the conventional structure on the support arms 19 and 20 of the support 14 having a complicated structure for receiving the braking torque acting on the friction pad. In addition, the projections 34 and 38 of the back plate 17 of each friction pad for transmitting the braking torque and the recesses 36 on the caliper claw 8 with which the projections 38 are engaged are formed on the support arms 19 and 20 of the support. The support can be formed simply and inexpensively as compared with the case of the conventional structure in which the torque receiving portion is formed.

Accordingly, the cost of the product can be reduced by eliminating the torque receiving portion on the support 14 which requires a high processing cost.

The mounting positions and the number of the protruding portions 34 and 38 provided on the back plate 17 of each friction pad are not limited to those in the above embodiment.

[0022]

In the disc brake device of the present invention, the braking torque acting on each friction pad during the braking operation is determined by the protrusions provided on the back plate of each friction pad and the pistons on which these protrusions are engaged. And transmitted to the caliper claw, and finally received by the connection between the caliper body and the support by the slide mechanism. Therefore, it is not necessary to form a torque receiving portion of the conventional structure on the support arm of the support having a complicated structure for receiving the braking torque acting on the friction pad. In addition, the convex portion of the back plate of the friction pad for transmitting the braking torque and the concave portion on the caliper claw with which the convex portion engages are simpler and cheaper than the case where the torque receiving portion is formed on the support. Can be formed. Therefore, the product cost can be reduced by eliminating the torque receiving portion on the support, which increases the processing cost.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of an embodiment of a disc brake device according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a view taken in the direction of the arrow C in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc rotor 3, 4 Friction pad 5 Piston 7 Cylinder part 8 Caliper claw 10 Disc brake device 11 Caliper body 13 Slide mechanism 14 Support 16 Lining part 17 Back plate 24, 25 Guide pin 27, 28 Guide hole 36 Depression 34, 38 Convex Department

Claims (1)

[Claims] 1. A cylinder portion accommodating a pair of friction pads opposed to each other with a disk rotor interposed therebetween and a piston housing a piston for pressing one of the pair of friction pads against the disk rotor. A caliper body provided on the other end side with a caliper claw for pressing the back surface of the other friction pad, and a support for supporting the caliper body slidably in the axial direction of the disk rotor via a slide mechanism. The caliper body slides in a direction opposite to the advance direction of the piston by a reaction force when the piston presses the one friction pad against the disk rotor by a brake operation, and the caliper claw causes the other friction. By pressing the pads against the disk rotor, a pair of friction pads sandwich the disk rotor. A floating caliper type disc brake device that obtains a braking state, wherein the piston engages an inner diameter portion of the piston on a back plate of the one friction pad with which the piston comes into contact, and the one friction is applied during a braking operation. A projection for transmitting a braking torque acting on the pad to the piston is provided, and a back plate of the other friction pad with which the caliper claw comes into contact is engaged with a recess formed in the caliper claw to perform braking. A projection configured to transmit a braking torque acting on the other friction pad to the caliper claw during operation; and coupling the braking torque acting on each friction pad during braking operation to the caliper body and the support by the slide mechanism. Disc brake device characterized in that it is received by the section.