JPH0348423Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an opposed piston type disc brake device having a friction pad support structure that prevents uneven wear of the friction pads and simplifies the assembly process.

[Conventional technology]

For example, an opposed piston type disc brake device disclosed in Japanese Utility Model Application Publication No. 54-99975 connects a first cylinder body and a second cylinder body, each having a cylinder hole, at a bridge portion to form an integral caliper body. , a piston is inserted into each of the cylinder holes, and a pair of friction pads, which are arranged opposite to each other on both sides of the disk and are respectively pushed by these pistons, are suspended by two hanger pins so as to be movable in the axial direction of the disk, Both pistons are actuated by pressure fluid supplied to both cylinder holes, and both friction pads pinch the disk for braking.In order to prevent the friction pads from wobbling during driving, the bridge of the caliper body is A pad spring is provided between the friction pad and the friction pad.

(Problem to be solved by the invention) By the way, in the above-mentioned configuration, the friction pad is suspended by two hanger pins and the center of the friction pad is aligned with the center of the cylinder hole, so that the friction pad can be easily adjusted during braking operation. Although uneven pressure is avoided to prevent uneven wear of the friction pads and so-called squealing, the use of two hanger pins requires time and effort to assemble them.

Therefore, the present invention has developed an opposed piston type disc brake that can reduce the number of hanger pins and still align the center of the friction pad with the center of the cylinder hole to avoid uneven pressure on the friction pad during braking. is intended to provide.

[Means for Solving the Problems] To achieve the above object, the present invention supports friction pads arranged on both sides of a disk so as to be movable in the axial direction of the disk, and inserts and inserts pistons that push both friction pads. In an opposed piston type disc brake device having a caliper body having cylinder holes facing each other, the inner diameter side of the disc on both sides of the friction pad is narrowed toward the center of the disc to form a narrow width. A guide portion is provided on the carrier body for slidingly contacting the inner diameter side of the disk to guide the movement of the friction pad in the axial direction of the disk during operation, and a protrusion is provided below the bridge of the carrier body, and the guide portion is latched to the protrusion. A pad spring having a locking portion, and a pair of pressing portions extending from the vicinity of the locking portion on both sides and abutting against the outer diameter side of the disk of the friction pad to press the friction pad toward the guide portion. It is characterized by its placement.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The caliper body 2 of the opposed piston type disc brake device 1 includes a first cylinder body 3 having a cylindrical cylinder hole 3a and a cylindrical cylinder hole 4.
facing the second cylinder body 4 having a,
Mounting surfaces 3c and 4c formed on bridge portions 3b and 4b spanning the disk 5 are brought into contact with each other and are integrally connected by connecting bolts 6, 6, and 6, respectively.

In addition, a pressure fluid supply hole 7 from a master cylinder (not shown) is bored in the first cylinder body 3 and opens at the bottom of the cylinder hole 3a, and a hole 7 for supplying pressure fluid from a master cylinder (not shown) is opened at the bottom of the cylinder hole 4a of the second cylinder body 4. A pressure fluid supply hole 9 opens through a communication hole 8 branched from the middle of the pressure fluid supply hole 7 of the first cylinder body 3.

Pistons 10 and 11 each having a cylindrical shape with a bottom are fluid-tightly and movably fitted into the cylinder holes 3a and 4a.
A hydraulic chamber 12 is formed between the bottom of the piston 11 and a hydraulic chamber 13 between the bottom of the piston 11 and the bottom of the cylinder hole 4a.

Further, the caliper body 2 includes a pair of friction pads 14 and 15 disposed opposite to each other on both sides of the disk 5.
is suspended movably in the axial direction of the disk 5 by one hanger pin 16, and both friction pads 1
The pistons 10 and 11 are in contact with the back surfaces of the pistons 4 and 15, respectively.

The above-mentioned hanger pin 16 is attached to the friction pads 14 and 1 during transportation before attaching the carrier body 2 to the vehicle body.
5 from falling and to ensure movement of the friction pads 14, 15 in the disk axial direction.

Since the friction pads 14 and 15 are formed symmetrically, the friction pad 15 shown in FIG. The hanger pin 16 is located on the exit side (right side in the figure).
The hanging portion 15b is formed to protrude, and the inner diameter sides 15f, 15g of the disk 5 are on both sides 15d, 15e parallel to the vertical direction in the figure (lower side in the figure).
is narrowed in an arc shape toward the center of the disk 5, and its width is narrower than that of the upper side portions 15d and 15e.

Further, the friction pad 15 is provided on the surface 4d of the second cylinder body 4 facing the first cylinder body 3.
Both side parts 15d and 15e and the inner diameter side part 15
Guide portions 4e and 4f are formed on the outer periphery of the cylinder hole 4a to guide the movement of the friction pad 15 in the disk axial direction by slidingly contacting the friction pads f and 15g.

The guide portions 4e, 4f have vertical guide surfaces 4g, 4h that are in sliding contact with both side portions 15d, 15e of the friction pad 15, respectively, and arcuate guide surfaces 4i, 4j that are in sliding contact with the inner diameter side portions 15f, 15g. It is formed continuously and integrally, and each guide surface 4g, 4h, 4
Friction pad 1 is adjusted so that the center of friction pad 15 and the center of cylinder hole 4a match by i and 4j.
Position 5.

Furthermore, the bridge portion 4b of the second cylinder body 4
A locking protrusion 4k for locking a pad spring 17 is provided below the pad spring 17, and the pad spring 17, which is locked by the locking protrusion 4k, allows the friction pad 15 to be attached to an arcuate inner diameter side portion. 15f, 15g are urged to press against the arcuate guide surfaces 4i, 4j of the guide portions 4e, 4f.

The friction pad 14 is also formed in the same manner as the friction pad 15, and the first cylinder body 3 is also formed in the same manner as the second cylinder body 4, and is guided by guide portions 3e and 3f (one not shown). The center of the friction pad 14 is aligned with the center of the cylinder hole 3a, and the locking protrusion 3k that locks the pad spring 17 has its tip so that the pad spring 17 can be easily locked during assembly. is tapered into a thinner shape.

The pad spring 17 is made by bending an elastic plate material into a substantially S-shaped cross section, and has clip-shaped locking portions 17a and 17b, which are locked to the locking protrusions 3k and 4k, respectively, at approximately the center thereof. Then, the pressing parts 17c and 17d at both ends are connected to the friction pads 14 and 15.
The friction pads 14 and 15 are brought into contact with the outer diameter sides 14a and 15a of the disks and the upper surfaces of the hanger pin holding parts 14b and 15b, respectively, and the friction pads 14 and 15 are attached to the guide parts 3e and 3, respectively.
It is biased so as to press against f, 4e, and 4f.

With this configuration, even if the number of hanger pins is reduced, the centers of the friction pads 14 and 15 can be matched with the centers of the cylinder holes 3a and 4a, respectively, thereby reducing the number of parts and simplifying the assembly process. This can be simplified, and furthermore, the pad spring 17 can prevent the friction pads 14 and 15 from rattling.

Further, in the above embodiment, the friction pads 14, 15
In the above description, the brake pads 14 and 15 are suspended by hanger pins 16, but as described above, the hanger pins 16 are used to prevent the friction pads 14 and 15 from falling during transport before attaching the brake pad body 2 to the vehicle body. This is provided to ensure the movement of the friction pads 14 and 15 in the disk axial direction, and the hanger pin 16 is omitted and the friction pads 14 and 15 are
are supported by the guide portions 3e, 3f, 4e, 4f and the pad spring 17, the friction pads 14,
15 and the centers of the cylinder holes 3a, 4a can be made to match, and the number of parts can be reduced and the assembly process can be simplified.

[Effect of idea]

As described above, the present invention is such that the inner diameter side of the disk on both sides of the friction pad of an opposed piston type disc brake is narrowed toward the center of the disk to form a narrow width, and the friction pad is slid on the inner diameter side of the disk on both sides of the friction pad. A guide part is provided on the carrier body to guide the movement of the friction pad in the disk axial direction during operation, and a protrusion is provided below the bridge of the carrier body, and a locking part is engaged with the protrusion;
Since a pad spring is provided which has a pair of pressing portions extending from the vicinity of the locking portion to both sides and abutting against the outer diameter side of the disk of the friction pad to press the friction pad toward the guide portion, the above-mentioned The guide part and pad spring automatically align the center of the friction pad with the center of the cylinder hole, avoiding uneven pressure when pressing the friction pad even if the number of hanger pins that suspend the friction pad is reduced. This prevents uneven wear and noise of the friction pads, as well as rattling of the friction pads during driving.Moreover, by locking the locking part of the pad spring to the protrusion provided below the bridge part, the pad spring It is possible to reliably prevent the parts from falling off, thereby reducing the number of parts and simplifying the assembly process.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a cross-sectional view taken from Fig. 5, Fig. 2 is a sectional view of the disc brake, Fig. 3 is a perspective view of the pad spring, and Fig. 4 is a cross-sectional view of Fig. 5. The front view of the disc brake, FIG. 5, is also a partially cutaway plan view. 1...Opposed piston type disc brake device,
2...Canaripa body, 3...First cylinder body, 4...Second cylinder body, 3a, 4a...
Cylinder hole, 3b, 4b...Bridge part, 3e,
3f, 4e, 4f... Guide portion, 3k, 4k... Locking protrusion of pad spring, 10, 11... Piston, 14, 15... Friction pad, 15a... Disc outer diameter side of friction pad, 15d ,15e...
Both sides of the friction pad, 15f, 15g...disc inner diameter side on both sides, 17...pad spring,
17a, 17b...Locking portion, 17c, 17d...
Pressing part.

Claims (1)

[Scope of utility model registration request] An opposed piston type disc brake device that supports friction pads arranged on both sides of a disc so as to be movable in the axial direction of the disc, and has a caliper body having opposing cylinder holes into which pistons are inserted to push both friction pads. In this step, the inner diameter side of the disk on both sides of the friction pad is narrowed toward the center of the disk to form a narrow width, and the pad slides into contact with the inner diameter side of the disk on both sides of the friction pad so that the friction pad is narrowed in the disk axial direction during operation. A guide portion is provided on the carrier body for guiding the movement of the carrier body, a projection is provided below the bridge of the carrier body, a locking portion is locked to the projection, and a guide portion is provided on the carrier body to guide the movement thereof, and a locking portion is configured to extend from the vicinity of the locking portion to both sides, 1. An opposed piston type disc brake device comprising a pad spring having a pair of pressing parts that abut against the outer diameter side of the disc of the friction pad and press the friction pad toward the guide part.