JP2006349044A - Disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake device provided with a first channel along the direction of rotation of a brake disc on a friction face with the brake disc of a brake pad by opening its both ends on a turn-in side and a turn-out side of the brake disc to improve cooling performance and equalize temperature distribution of the brake disc. <P>SOLUTION: A second channel 19 along the radial direction of the brake disc 5 is provided in the brake pad 7 by communicating with the first channel 18 and opening an outer end for the outer periphery of the brake pad 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disc brake device, and in particular, a first groove along the rotation direction of the brake disc is formed on a friction surface of the brake pad with the brake disc, and both ends of the first groove are provided on the entrance side and the exit side of the brake disc. The present invention relates to a disc brake device that is provided so as to open to the front.

A disk brake device in which a groove along the rotation direction of the brake disk is provided on the friction surface of the brake pad with the brake disk in order to dissipate frictional heat generated between the brake disk and the brake disk during braking is already known from, for example, Patent Document 1 and the like. It has been.
Japanese Utility Model Publication No. 7-17864

  By the way, with disc brakes mounted on the wheels of vehicles, vibrations during high-speed braking, fades during repeated braking, thermal fatigue cracks in brake discs, vapor locks during continuous downhill, etc. are raised as issues. In the disc brake disclosed in No. 1, air is circulated through a groove provided on a friction surface of the brake pad with the brake disc in order to solve the above problem, but further improvement in cooling performance is desired. It is.

  In addition, in the brake pads of conventional disc brake devices, the temperature of the brake disc becomes uneven due to poor heat dissipation / cooling performance at the center, which causes thermal fatigue cracks, uneven adhesion, and abnormal wear of the brake disc. Therefore, it is desired to make the temperature distribution of the brake disc more uniform.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a disc brake device capable of improving the cooling performance and further equalizing the temperature distribution of the brake disc.

  In order to achieve the above object, according to the first aspect of the present invention, the first groove along the rotation direction of the brake disk is formed on the friction surface of the brake pad with the brake disk, and both ends of the first groove are routed to the brake disk. In the disc brake device provided so as to open to the side and the delivery side, the second groove along the radial direction of the brake disc communicates with the first groove and opens one end to the outer periphery of the brake pad. Thus, the brake pad is provided on the brake pad.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the first groove is formed in an arcuate shape with the center disposed outside the rotation center of the brake disk. It is characterized by.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, one end of the second groove is disposed so as to open toward a window provided in a bridging portion of the caliper body. It is characterized by that.

  Furthermore, the invention according to claim 4 is the configuration of the invention according to any one of claims 1 to 3, wherein the brake pad is symmetrical with respect to a center line of the brake pad along a circumferential direction of the brake disc. It is formed in this.

  According to the first aspect of the present invention, it is possible to improve the cooling performance of the brake disc and the brake pad by allowing the air flowing through the first groove to escape radially outward of the brake disc by the second groove. Moreover, the temperature distribution of the brake disc can be made more uniform by reducing the work amount at the central portion of the brake pad. Further, the vibration sensitivity can be reduced by adjusting the deformation amount of the friction material during braking by the second groove.

  According to the second aspect of the invention, the air flow in the first groove can be smoothed while reducing the work amount as much as possible.

  According to invention of Claim 3, discharge | release of the air from a 2nd groove | channel is accelerated | stimulated and cooling efficiency can be improved more.

  Furthermore, according to the invention described in claim 4, the brake pads having the same shape can be arranged on both sides of the brake disc, so that the types of parts constituting the disc brake device can be reduced and the cost can be reduced. be able to.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a disc brake device, and FIG. 2 is a view taken in the direction of arrow 2 in FIG.

  First, in FIG. 1, this disc brake device is disposed between a brake disc 5 that rotates with a wheel of a wheel (not shown), a caliper body 6, and both side surfaces of the brake disc 5, and between the brake disc 5 and the caliper body 6. A pair of left and right brake pads 7, 7.

  The caliper body 6 is supported by a bracket 8 attached to a vehicle body (not shown) on one side of the brake disc 5 so as to be movable in a direction along the axis of the brake disc 5 and is arranged on one side of the brake disc 5. The action part 6a, a reaction part 6b arranged on the other side of the brake disk 5, and a bridging part 6c connecting the action part 6a and the reaction part 6b across the brake disk 5 are integrally provided.

  Thus, the brake pad 7 is formed by providing the back metal 9 with the friction material 10 that can slide on the brake disk 5, and the brake pads 7, 7 have the friction material 10. The caliper body 6 is disposed between the action portion 6 a and the reaction portion 6 b and the brake disc 5.

  The action part 6a of the caliper body 6 is provided with a bottomed cylinder hole 11 opened to the brake disc 5 side, and a cup-shaped piston 12 having an end wall 12a at one end is provided in the cylinder hole 11. The end wall 12 a is slidably fitted toward the closed end side of the cylinder hole 11, and a hydraulic chamber 13 is formed between the piston 12 and the action portion 6.

  The other end opening of the piston 12 is opposed to the back metal 9 of one brake pad 7 so as to be able to come into contact therewith, and a bellows dust cover 14 is provided between the opening end of the cylinder hole 11 and the piston 12. An annular piston seal 15 that elastically slides on the outer periphery of the piston 12 is mounted on the inner surface of the cylinder hole 11.

  In such a disc brake device, when the hydraulic pressure acts on the hydraulic chamber 13, the piston 12 advances toward the brake disc 5, and when one brake pad 7 is pressed against one surface of the brake disc 5, the reaction force When the reaction portion 6b moves to the brake disc 5 side, the other brake pad 7 is also pressed against the other surface of the brake disc 5, and the friction materials 10 of the brake pads 7, 7 are both surfaces of the brake disc 5. A braking action is performed in sliding contact with. The bridging portion 6c of the caliper body 6 is provided with a window 16 for monitoring the worn state of the brake pads 7 and 7 from the outside.

  On the friction surface of the brake pad 7 with the brake disk 5, that is, the surface of the friction material 10 facing the brake disk 5, as shown in FIG. 2, a first groove 18 along the rotation direction 17 of the brake disk 5 and the brake A second groove 19 is provided along the radial direction of the disk 5.

  Thus, in this embodiment, the first and second grooves 18 and 19 are provided in the friction material 10 so as to leave a part of the friction material 10 on the back metal 9 side. Is provided on the friction material 10 so that both ends thereof are opened to the turn-in side and the turn-out side (the left side and the right side in FIG. 2) of the brake disc 5 with respect to the brake pad 7, and more than the rotation center C 1 of the brake disc 5. The center C2 is arranged on the outer side and formed in an arc shape. That is, when the central portion of the friction material 10 along the radial direction of the brake disk 5 is within a range defined by different radii R1, R2 around the rotation center C1, the first groove 18 is In this range, that is, the entirety of the friction material 10 is arranged along the radial direction of the brake disc 5 so as to be along an arc drawn from the center C2 with a radius R3 smaller than the radii R1 and R2. Formed.

  The second groove 19 is formed so as to extend linearly along the radial direction of the brake disc 5 at the center position in the circumferential direction of the brake pad 7, and its intermediate portion is substantially orthogonal to the first groove 18. Thus, one end of the second groove 19 is opened to the outer periphery of the friction material 10 so as to be opened toward the window 16 provided in the bridging portion 6 c of the caliper body 6, and the second groove 19 is opened. The other end of the groove 19 is opened on the inner periphery of the friction material 10.

  Further, the second groove 19 is formed by linearly connecting a wide groove portion 19 a on the outer peripheral side having a wider width and a narrow groove portion 19 b on the inner peripheral side having a narrow width, and the circumferential direction of the friction material 10. The inner end of the wide groove portion 19 a is continuous with the first groove 18 at the center position. In addition, each corner portion in the connecting portion of the first and second grooves 18 and 19 is formed to be bent, and the corner portions of both end openings of the first and second grooves 18 and 19 are also formed to be bent. Is done.

  Thus, the brake pad 7 is formed symmetrically with respect to the center line of the brake pad 7 along the circumferential direction of the brake disc 5, that is, the center line in the width direction of the second groove 19.

  Next, the operation of this embodiment will be described. The first groove 18 along the rotation direction 17 of the brake disk 5 is formed on the friction surface of the friction material 10 with the brake disk 5 in the brake pad 7. The second groove 19 along the radial direction of the brake disk 5 communicates with the first groove 18 and opens at one end to the outer periphery of the brake pad 7. Thus, the cooling performance of the brake disc 5 and the brake pad 7 can be improved by allowing the air flowing through the first groove 18 to escape radially outward of the brake disc 5 by the second groove 19. Is possible. In addition, by reducing the amount of work in the central portion of the brake pad 7, the temperature distribution of the brake disk 5 can be made more uniform. Further, the vibration sensitivity can be reduced by adjusting the deformation amount of the friction material 10 during braking by the second groove 19.

  In addition, the first groove 18 is formed in an arc shape by disposing the center C2 outside the rotation center C1 of the brake disc 5, and reduces the work amount of the brake pad 7 as much as possible. It is possible to smooth the air flow in the room.

  Further, the outer end opening of the second groove 19 is arranged toward the window 16 provided in the bridging portion 6c of the caliper body 6, thereby promoting the release of air from the second groove 19 and cooling. Efficiency can be further increased.

  Further, since the brake pad 7 is formed symmetrically with respect to the center line of the brake pad 7 along the circumferential direction of the brake disc 5, the brake pad 7 having the same shape can be arranged on either side of the brake disc 5. In this way, it is possible to reduce the types of parts constituting the disc brake device and contribute to cost reduction.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, in the above embodiment, the brake pad 7 is formed by directly providing the friction material 10 on the back metal 9. However, the present invention can also be applied to a structure in which an insulator is interposed between the back metal 9 and the friction material 10. is there. Further, the first and second grooves 18 and 19 may be formed so that the insulator or the back metal 9 faces the bottom.

It is a longitudinal cross-sectional view of a disc brake device. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1.

Explanation of symbols

5 ... brake disc 6 ... caliper body 6c ... bridging part 7 ... brake pad 16 ... window 17 ... rotating direction 18 ... first groove 19 ... second Groove C1 ... center of rotation of brake disc

Claims (4)

  A first groove (18) along the rotational direction (17) of the brake disk (5) is formed on the friction surface of the brake pad (7) with the brake disk (5). In the disc brake device provided so as to open to the entrance side and the exit side, the second groove (19) along the radial direction of the brake disc (5) communicates with the first groove (18). The disc brake device is provided on the brake pad (7) so that one end thereof is opened to the outer periphery of the brake pad (7).   The disc brake device according to claim 1, wherein the first groove (18) is formed in a circular arc shape with the center located outside the rotation center (C1) of the brake disc (5). .   The one end of said 2nd groove | channel (19) is arrange | positioned so that it may open toward the window (16) provided in the bridge | crosslinking part (6c) of a caliper body (6), Disc brake device as described.   The brake pad (7) is formed in a symmetrical shape with respect to a center line of the brake pad (7) along a circumferential direction of the brake disc (5). Disc brake device as described.

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