JP2010007844A - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake capable of regulating input of excessive stress from a receiving part to a piston supporting part and capable of surely preventing deformation of a caliper due to the hydraulic pressure without deteriorating assembling workability. <P>SOLUTION: A carrier 5, which holds a pad, and a caliper 7, which comprises a piston for pushing the pad, are formed as separate blocks. The pad is arranged on both sides of a brake disc 3, and held by the carrier 5 freely to slide in the axial direction of the disc. Bolts 21 and 42 for fastening the caliper 7 and the carrier 5 to each other are arranged on both sides of the brake disc 3, and one bolt 21 is fastened in the axial direction of the disc, and the other bolt 42 is fastened in the radial direction of the disc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disc brake used for vehicle wheel braking or the like.

A disc brake used for vehicle wheel braking has a brake disc integrally attached to the wheel side, and a cylinder portion is provided in a caliper attached to the vehicle body side, and a piston housed in a bore of the cylinder portion is a friction material. The brake disc is pressed through the pad.
As this type of disc brake, there is known an opposed piston type disc brake in which pads are arranged on both sides of the disc axis direction of the brake disc and the pads are pressed by a pair of opposed pistons. In this disc brake, a pair of pads are slidably supported by a caliper by pins along the disc axial direction, and a receiving portion for supporting both ends of the pad in the disc rotating direction is provided on the caliper. Thus, the braking torque acting on the pad is received. (For example, refer to Patent Document 1).
JP 2006-207655 A

  Although this conventional counter-piston disc brake has good controllability of pad clearance, the receiving part for receiving braking torque and the piston support part (cylinder part) are formed by an integral block. There is a concern that the braking torque acting on the part acts as a large stress on the piston support part, thereby inhibiting the sliding of the piston or tilting the pressing direction of the piston. An increase in sliding resistance of the piston and an inclination in the pressing direction are likely to cause a brake squeal.

For this reason, the applicant forms a disc brake in which the carrier for receiving the braking torque of the pads on both sides and the caliper having the piston support portion are formed by separate blocks, and the carrier and the caliper are coupled by fastening means. A proposal was filed earlier as Japanese Patent Application No. 2007-036930. In the case of this disc brake, a fastening portion is provided on one side of the carrier and caliper in the disc axial direction, and these fastening portions are coupled to each other by fastening means along the axial direction in a state of abutting each other.
In this disc brake, since the carrier that receives the braking torque is a separate body from the caliper, the braking torque hardly acts on the piston support portion as a large stress.

  However, in the disk brake of this earlier application, since the carrier and the caliper are fastened on one side in the disk axial direction by fastening means such as bolts, if a large hydraulic pressure acts on the piston support portion during braking, the caliper is caused by the hydraulic pressure. There is a concern that the piston support portion on the opposite side to the fastening portion side warps and deforms radially outward, and the pedal feel decreases due to the occurrence of a hydraulic pressure loss or the like.

  As a countermeasure, it is conceivable that similar fastening portions are provided on both sides of the carrier and caliper in the disk axial direction, and the carrier and caliper are coupled by fastening means on both sides of the disk axial direction.

  However, in the case where similar fastening portions are provided on both sides of the carrier and caliper in the disk axial direction as described above, the pair of the other fastening portions must be inserted between the pair of the fastening portions when the two are assembled. However, the assembly becomes difficult due to the manufacturing error of each block.

  Therefore, the present invention can restrict the input of excessive stress from the receiving portion to the piston support portion, and can surely prevent the caliper from being deformed by the hydraulic pressure without deteriorating the assembling workability. Disc brakes are to be provided.

  According to the first aspect of the present invention for solving the above-described problem, the carrier and the caliper are provided separately, and fastening means for fastening the carrier and the caliper are provided on both sides of the brake disc, respectively, and fastening on one side is performed. The means is provided along the axial direction of the brake disc, and the fastening means on the other side is provided along the direction orthogonal to the axial direction of the brake disc.

  According to the present invention, since the carrier and the caliper are provided separately, and the fastening means for fastening the carrier and the caliper are provided on both sides of the brake disk, the caliper is received from the receiving portion of the carrier that receives the braking torque. Excessive stress input to the piston support can be restricted, and the caliper can be reliably prevented from warping and deforming due to hydraulic pressure, and the fastening means on one side can be connected to the brake disc in the axial direction. Since the other side portion fastening portion is provided along the direction orthogonal to the axial direction of the brake disc, the assemblability of the carrier and the caliper can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
First, an embodiment shown in FIGS. 1 to 10 will be described. In each figure, the arrow IN indicates the inside in the vehicle width direction, and the arrow OUT indicates the outside in the vehicle width direction.
1 to 6 and 10 show an entire block of a disc brake 1 according to the present invention. The disc brake 1 is coupled to a knuckle (not shown) for supporting an axle of a vehicle by fastening bolts at the fastening holes 2 and 2 at the lower edge. The block of the disc brake 1 is attached to the knuckle so as to cover a part of the outer peripheral edge of the brake disc 3 that rotates integrally with the wheel, and is controlled by pressing the outer peripheral edge of the brake disc 3 from both sides. Generate power. In the following, the description will be given with the vehicle mounted state, the radial direction of the brake disk 3 in this mounted state will be referred to as the disk radial direction, the axial direction of the brake disk 3 will be referred to as the disk axial direction, and the brake disk 3 The circumferential direction is referred to as the disk circumferential direction.

  The block of the disc brake 1 is directly coupled to the knuckle by a bolt, and a caliper 7 having a carrier 5 that mainly holds the pads 4 and 4 pressed against the brake disc 3 and a piston 6 that presses the pads 4 and 4. It is constituted by. The disc brake 1 has substantially arc-shaped disc passage recesses 8A and 8B (see FIG. 4) that allow passage of the outer peripheral edge of the brake disc 3 across the carrier 5 and the caliper 7, and the disc radius of the carrier 5 A caliper 7 is arranged on the outer side in the direction of polymerization.

  The disc brake 1 is an opposed piston type brake, and pads 4 and 4 held by the carrier 5 are disposed on both sides in the disc axial direction of the brake disc 3 and the piston 6 held by the caliper 7. Are arranged on both sides of the brake disc 3 so as to press the back of each pad 4. In the case of this embodiment, two pistons 6 and 6 are arranged side by side in the disk circumferential direction on one side of the brake disk 3, and the two pistons 6 and 6 arranged in parallel are horizontally long pads 4 in the disk circumferential direction. It is designed to press the back of the.

  First, the caliper 7 will be described. The caliper 7 includes an inner side cylinder portion 9 and an outer side cylinder portion 10 on the inner side and the outer side in the vehicle width direction with the brake disc 3 interposed therebetween, and each of the cylinder portions 9 and 10 includes a piston. A bore 11 that slidably accommodates 6 is formed along the disk axial direction. The inner and outer cylinder portions 9 and 10 are connected to each other by a bridge portion 12 straddling the radially outer side of the brake disk 3 and surrounded by the bridge portion 12 and the cylinder portions 9 and 10 on both sides. The area is a disk passage recess 8B on the caliper 7 side. The bores 11 in the caliper 7 are connected to each other by a supply / discharge passage (not shown) in the caliper 7, and brake fluid is supplied / discharged through a supply / discharge plug 13 formed in the inner cylinder portion 9 of the caliper 7. It has become so.

  In the case of this embodiment, the remaining part including the outer side cylinder part 10 and part of the bridge part 12 and the inner side cylinder part 9 are formed as separate caliper blocks C1 and C2, and both caliper blocks C1 and C2 are formed. Later, they are connected to each other by a plurality of bolts 14a, 14b, 14c along the disk axial direction.

  Further, as shown in FIG. 3, the caliper 7 as a whole is formed in a substantially circular arc shape when viewed from the disk axial direction, but at the lower edge of the inner cylinder portion 9 of the caliper 7, A first fastening piece 15 extending inward is integrally provided. Bolt insertion holes 35 are formed along the disk axial direction at two positions spaced apart in the disk circumferential direction of the first fastening piece 15, and bolts 21 as fastening means are inserted into the bolt insertion holes 35. It has become so.

  On the other hand, a second fastening piece 40 that extends outward in the disc axial direction (outside of the vehicle) is integrally provided in a central region in the disc circumferential direction of the lower edge of the outer cylinder portion 10 of the caliper 7. A bolt insertion hole 41 is formed in the second fastening piece 40 along the disk radial direction (a direction orthogonal to the disk axial direction), and a bolt 42 as a fastening means is inserted into the bolt insertion hole 41. It has become.

  Furthermore, as shown in FIG. 1, a pair of rectangular confirmation windows 30 penetrating in the disk radial direction are formed in the bridge portion 12 that connects the cylinder portions 9 and 10, and the caliper 7 is formed from the outside in the disk radial direction. Through this confirmation window 30, the degree of reduction of the pad 4 can be confirmed. As described above, since the bridge portion 12 is located on the outer side in the disk radial direction of the pad 4 except for the confirmation window 30, the caliper 7 can exhibit high rigidity, and both cylinder portions 9 can be used during braking. , 10 can be prevented from being deformed in the direction away from each other.

  7 to 9 show the carrier 5 of the disc brake 1 of this embodiment. As shown in these drawings, the carrier 5 is provided with an inner wall 16 and an outer wall 17 on the inner side and the outer side in the vehicle width direction with the brake disc 3 interposed therebetween, and both edges of the both walls 16 and 17 are coupled to each other. Has been. As shown in FIG. 7, the carrier 5 has a substantially rectangular opening 18 when viewed from the outside in the radial direction of the disk, and the opening 18 is continuous with the disk passage recess 8B on the caliper 7 side. ing.

  As shown in FIG. 9, an extending portion 19 is provided at the inner end of the inner wall 16 in the disk radial direction, and the carrier 5 is knuckled at two positions spaced apart in the disk circumferential direction of the extending portion 19. The aforementioned fastening holes 2 and 2 for fastening bolts are provided. Further, in the vicinity of both end portions of the inner wall 16 in the disk circumferential direction, there are provided fastening portions 36 in which the first fastening pieces 15 on the caliper 7 side are superposed in the disc axial direction from the inner side in the vehicle width direction. A screw hole 20 is formed in the portion 36 along the disk axial direction from the inside in the vehicle width direction. Bolts 21 (fastening means) that pass through the bolt insertion holes 35 on the caliper 7 side are screwed into the screw holes 20.

  Also, substantially rectangular pad receiving grooves 23 in which the pads 4 and the back metal 22 for supporting the pads 4 are arranged are formed in the outer regions of the inner wall 16 and the outer wall 17 in the disk radial direction. Each of the pad receiving grooves 23 opens outward in the radial direction of the disk so that the substantially lower half of the pad 4 and the back metal 22 is received. In other words, the upper half of the pad 4 and the back metal 22 protrudes outward from the carrier 5 in the radial direction of the disk. Further, a substantially rectangular guide groove 24 is formed in a concave shape on the side edges of the inner wall 16 and the outer wall 17 of each pad receiving groove 23 on both sides in the disk circumferential direction.

  In each guide groove 24, a substantially rectangular protrusion 25 protruding from both edges of the back metal 22 is slidably guided along the disk axial direction. That is, the pad 4 is unevenly fitted into the guide grooves 24 on both sides via the protrusions 25 of the back metal 22, and the displacement in the disk circumferential direction and the disk radial direction is allowed to be displaced by the guide grooves 24 in the disk axial direction. It is regulated. In the case of this embodiment, the edge portions 24 a of the guide grooves 24 of the inner wall 16 and the outer wall 17 serve as receiving portions that receive the braking torque of the pad 4. Further, a leaf spring 26 for biasing the back metal 22 together with the pad 4 outward in the disk radial direction is interposed between the pad receiving groove 23 and the vicinity of the protrusion 25 of the back metal 22.

  Further, a fastening portion 43 extending outward in the disc axial direction (outside in the vehicle width direction) is provided in the center of the outer wall 17 in the disc circumferential direction, and a second fastening piece on the caliper 7 side is provided in the fastening portion 43. 40 is superposed from the outside in the radial direction of the disk. A screw hole 44 is formed in the fastening portion 43 along the disk radial direction, and a bolt 42 (fastening means) penetrating the bolt insertion hole 41 on the carrier 7 side is screwed into the screw hole 44. Yes.

  The caliper 7 is integrated with the carrier 5 in a state where the pad 4 is set on the carrier 5 together with the back metal 22 and the leaf spring 26. At this time, the first fastening piece 15 of the caliper 7 is superposed on the fastening portion 36 on the inner wall 16 side of the carrier 5 from the inner side in the disk axial direction, and the fastening portion 43 on the outer wall 17 side of the carrier 5 is placed on the caliper. 7 second fastening pieces 40 are superposed from the outside in the disk radial direction. The fastening portion 36 and the first fastening piece 15 are fastened by the bolt 21 along the disk axial direction, and the fastening portion 43 and the second fastening piece 40 are fastened by the bolt 42 along the disk radial direction. Thus, when the carrier 5 and the caliper 7 are fastened, the corresponding piston 6 on the caliper 5 side is arranged on the back of each back metal 22 on the carrier 5 side.

  In the disc brake 1 configured as described above, when brake fluid is supplied to the bores 11 of the cylinder portions 9 and 10 during braking, the pistons 6 in the bores 11 are moved forward by receiving fluid pressure, 6 advances the corresponding pad 4 through the back metal 22. As a result, the pads 4 on both sides of the brake disc 3 are similarly pressed against both sides of the disc 3, thereby applying a braking force.

  On the other hand, the braking torque acting on the pad 4 at this time is received by the edge portion 24a (receiving portion) of each guide groove 24 of the carrier 5. Although this braking torque acts as a stress on the carrier 5, the carrier 5 and the caliper 7 are formed separately and are coupled to each other by the bolts 21 and 42, so that the stress caused by the braking torque is applied to the caliper 7. It does not act directly. That is, in this disc brake 1, the edge 24 a of the guide groove 24 of the carrier 5 regulates the displacement of the pad 4 and the back metal 22 in the disc circumferential direction and the disc radial direction outside, and the caliper 7 side has only the piston 6 and the pad 4. Therefore, the caliper 7 is not directly subjected to the stress caused by the braking torque.

  For this reason, in the disc brake 1, the cylinder portions 9 and 10 of the caliper 7 do not bend and deform due to the stress caused by the braking torque, and the piston 11 is prevented from sliding due to the deformation or inclination of the bore 11. There is no inconvenience that the pressing direction of the piston 6 is inclined. In particular, in the case of this embodiment, the first fastening piece 15 and the second fastening piece 40 that are extended from the bores 11 of the cylinder portions 9 and 10 of the caliper 7 are respectively connected to the carrier by bolts 21 and 42. Therefore, it is possible to effectively prevent the piston 6 from being affected by the braking torque. Therefore, in this disc brake 1, a stable operation of the piston 6 can always be obtained, and the occurrence of brake squeal can be prevented in advance.

  Further, in the disc delay 1, the first fastening piece 15 on one side of the caliper 7 and the second fastening piece 40 on the other side are connected to the fastening portions 36 and 43 of the carrier 5 by bolts 21 along the disc axial direction. Are connected to each other by bolts 42 along the disk radial direction, so that the vicinity of the inner side cylinder portion 9 and the outer side cylinder portion 10 of the caliper 7 are directly supported by the carrier 5, respectively. The caliper 7 is not warped and deformed in the radial direction of the disk by the acting hydraulic pressure.

  Further, in the case of this disc brake 1, the first fastening piece 15 and the second fastening piece 40 of the caliper 7 abut against the fastening portions 36 and 43 of the carrier 5 in the disc axial direction and the disc radial direction, respectively. Even if there are some manufacturing errors in the caliper 7 and the carrier 5, the assembly workability is not lowered.

  Further, in the disc brake 1, when replacing parts such as the pad 4 and the piston 6, the bolts 21 and 42 are loosened and the entire caliper 7 is removed. When the entire caliper 7 is removed in this way, the pad 4 and the piston 6 can be replaced in a space with a margin.

11 and 12 show a disc brake device 101 according to another embodiment of the present invention. In these drawings, the same reference numerals are given to the same parts as those in the above-described embodiment.
The basic configuration of the disc brake device 101 of this embodiment is substantially the same as that of the above-described embodiment, but the inner fastening side 115 of the caliper 7 and the fastening portion 136 on the inner side of the carrier 5 are not connected. The second fastening piece 140 on the outer side of the caliper 7 and the fastening portion 143 on the outer side of the carrier 5 extend inward in the radial direction of the disk while extending inward in the axial direction, and the first fastening piece 115 and the fastening portion 136 are extended. Is different from the above-described embodiment in that the second fastening piece 140 and the fastening portion 143 are joined by a bolt 142 along the disk axial direction.
In this embodiment, the structure of the inner side and outer side fastening portions is opposite to that of the above-described embodiment, but substantially the same effect as that of the above-described embodiment can be obtained.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

The top view of the disc brake of one Embodiment of this invention. The A arrow directional view of FIG. 1 of the disc brake of the embodiment. The arrow B view of FIG. 1 of the disc brake of the embodiment. The rear view of the disc brake of the embodiment. The side view of the disc brake of the embodiment. Sectional drawing corresponding to CC cross section of FIG. 1 of the disc brake of the embodiment. The top view of the carrier of the disc brake of the embodiment. The arrow D figure of FIG. 7 of the carrier of the disc brake of the embodiment. The E arrow directional view of FIG. 7 of the carrier of the disc brake of the embodiment. The front view which shows the assembly | attachment state of the caliper and carrier of the disc brake of the embodiment. The top view of the disc brake of other embodiment of this invention. Sectional drawing corresponding to the FF cross section of FIG. 11 of the disc brake of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 ... Disc brake 3 ... Brake disc 4 ... Pad 5 ... Carrier 6 ... Piston 7 ... Caliper 21, 121 ... Bolt (fastening means on one side)
42, 142 ... bolt (fastening means on the other side)

Claims (1)

A pair of pads arranged on both sides of the brake disc are slidably supported in the disc axial direction and receive the braking torque of the pads, and the pair of pads fixed to the carrier by fastening means, respectively. In a disc brake consisting of a caliper having a piston provided opposite to be pressed,
The fastening means is provided on both sides of the brake disc, the fastening means on one side is provided along the axial direction of the brake disc, and the fastening means on the other side is in the axial direction of the brake disc. The disc brake is provided along a direction orthogonal to

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