JPS6230584Y2 - - Google Patents

Description

[Detailed description of the invention] This invention straddles friction pads arranged facing each other on both sides of the disk, and an inner part equipped with a pressing means for pressing the back surface of one friction pad comes into contact with the back surface of the other friction pad. Attach sliding pins parallel to the disk axial direction to pin attachment portions on the disk rotation side and the disk rotation side of the caliper having an outer portion,
This sliding pin is slidably inserted into a support hole provided in the bracket, and the caliper is moved in the disk axial direction by the reaction force of the pressing means pushing one of the friction pads, thereby causing the outer portion This relates to a disc brake device for a vehicle that brakes by pushing the other friction pad.

In this type of disc brake device, the sliding pins fixed to the pin mounting parts on the disc rotation side and the disc rotation side of the caliper are tightly fitted into the support holes of the bracket via elastic bushings, and the vibrations of the caliper are prevented. It is designed to ensure durability and to allow the sliding pin to slide smoothly without being affected by the deflection of the bracket due to braking torque.

However, even with this method, one side of the elastic bushing is compressed between the sliding pin and the support hole due to the deflection of the bracket, and it is not possible to completely prevent the occurrence of the sticking phenomenon in which the sliding pin becomes stuck. At the pin attachment part on the exit side, an uneven tensile force is generated, which is small on the disk side and large on the non-disk side, while at the pin attachment area on the disk insertion side, a large tensile force is generated on the disk side and compressed on the non-disk side. When force is generated, the caliper rotates around this fixed point, and uneven wear of the friction pads and increased sliding resistance of the sliding pin cannot be eliminated, ensuring smooth and reliable braking force. There were problems such as not being able to do so.

The present invention was developed against the background of the above circumstances, and includes forming a pin fitting groove that is open in the disk rotation direction in the disk rotation side pin attachment part of the caliper, and forming a pin fitting groove that is open in the disk rotation direction. The cylindrical base of the sliding pin is slidably and closely fitted, and the base end thereof protrudes from the pin fitting groove, and between the base end of the sliding pin and the pin mounting portion on the disk rotation side. The elastic locking member is compressed, the sliding pin is urged in the disk axial direction, the flange portion of the sliding pin is pressed into contact with the pin mounting portion, and the pin mounting portion on the disk rotation side of the caliper is pressed against the sliding pin. The caliper is characterized by being elastically supported so as to be relatively movable in the disk axial direction and the disk rotation direction, and the purpose is that the caliper smoothly follows the deflection caused by the braking torque of the bracket and moves in the disk rotation direction, and the sliding pin and There is no sticking phenomenon, and the sliding pin slides smoothly inside the support hole. This ensures stable and reliable braking at all times without uneven wear or braking failure, and the caliper is not affected by the braking torque. An object of the present invention is to provide the above disc brake device for a vehicle, which prevents lifting of the vehicle.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a disk that rotates together with the wheel; 2 is a bracket that is placed adjacent to one side of the disk 1, and is fixed to a vehicle body (not shown) through attachment holes 3, 3 in the lower part of the bracket. The bracket 2 has a pair of left and right support arms 4 and 5 spaced apart from each other in the circumferential direction of the disk 1, and these support arms straddle the outer periphery of the disk 1. Reference numerals 6 and 7 indicate guide rails protruding from opposite surfaces of the supporting arms 4 and 5, and back plates 8a and 7 of the pair of friction pads 8 and 9 arranged on both sides of the disk 1.
Both ends of the disk 9a are supported slidably in the axial direction of the disk 1, respectively.

Reference numeral 10 denotes a caliper having an inner part 11 and an outer part 12, and is arranged so as to straddle the disc 1 and both friction pads 8 and 9 arranged on both sides thereof, and the inner part 11 is connected to a master cylinder (not shown). It is provided with a hydraulic cylinder 13 in communication with which a piston 14 for pressing the inner friction pad 8 against the disk 1 is housed. On the other hand, the outer portion 12 is in contact with the back surface of the other friction pad 9.

This caliper 10 has pin mounting portions 1 on the disk rotation side and the disk rotation side of the inner portion 11.
5 and 16 are integrally provided, and this pin mounting portion 16 on the disk rotation side is a sliding member that is fitted into a support hole 5a formed in the support arm 5 of the bracket 2 so as to be slidable in the disk axial direction. Tighten bolt 18 to pin 17
It is tightened and fixed.

On the other hand, the pin fitting groove 19 in the pin mounting part 15 on the disk rotation side is open in the disk rotation direction, and the side wall 19a on the disk rotation side is formed in a semicircular shape, and the support arm of the bracket 2 is formed into a semicircular shape. The cylindrical base 20a of the sliding pin 20, which is slidably inserted in the support hole 4a formed in 4 in the disk axial direction, is slidably and tightly fitted into this pin fitting groove 19, and the base part The end protrudes from the pin fitting groove 19.

Reference numeral 21 denotes an elastic locking member inserted through the cylindrical base 20a of the sliding pin 20, which connects the washer 23, which is locked to the clip 22 fixed to the base end of the cylindrical base 20a, and the non-disk side surface of the pin attachment part 15. 1
5a, and its spring force urges the sliding pin 20 toward the inner side in the disk axial direction, and the flange portion 20b of the sliding pin 20 is attached to the disk side side surface 15b of the pin mounting portion 15. They are in pressure contact.

As a result, the pin attachment part 15 on the disk rotation side
is supported to be movable relative to the cylindrical base 20a of the sliding pin 20 in the disk axial direction and the disk rotational direction, so that the caliper 10 responds to the deflection of the support arm 5 on the disk rotation side of the bracket 2 during braking. It can be followed via the sliding pin 17 and moves in the direction of disk rotation. At this time, since only the spring load from the elastic locking member 21 is applied to the pin attachment part 15 on the disk rotation side, the pin attachment part 15 moves diagonally downward to the right in FIG. No tensile force is generated.

22 is between the sliding pin 20 on the disk rotation side and the support arm 4, and 23 is the sliding pin 1 on the disk rotation side.
7 and the support arm 5.

Next, the operation of this embodiment will be explained. Hydraulic cylinder 13 is operated by operating a master cylinder (not shown).
When pressure fluid is supplied to the piston 14, the piston 14 moves forward due to the fluid pressure, and presses the friction pad 8 against one side of the disk 1. At the same time, the reaction force causes the caliper 10 to push both sliding pins 17 and 20 into the support hole 5.
The outer portion 12 presses the other friction pad 9 against the other side of the disk 1 while sliding along the pistons 14 and 4a.
In this way, the disk 1 has friction pads 8 on both sides,
The braking torque applied to the friction pads 8 and 9 from the disk 1 is supported by the support arm 5 on the disk rotation side.

By supporting this braking torque, the support arm 5 is deflected in the direction of rotation of the disk 1, which causes the sliding pin 17 to move in the direction of rotation of the disk, causing the caliper 10 to rotate the disk via the pin attachment portion 16. Pull in the direction.

At this time, the pin attachment part 15 on the disk rotation side is fitted into the cylindrical base 20a of the sliding pin 20 so as to be movable relative to the cylindrical base 20a of the sliding pin 20, and is elastically supported by the elastic locking member 21. Therefore, the pressing force of the elastic locking member 21 is applied to the pin mounting portion 15.
The pin mounting part 15 on the disk rotation side
A large tensile force is not generated in the pin attachment part 1.
5 moves slightly diagonally downward to the right in FIG. 1, and the caliper 10 moves following the deflection of the support arm 5 on the disk rotation side.

Therefore, both the sliding pins 17 and 20 are both released from the braking torque and remain in the support holes 5a and 4a even during braking.
The caliper 10 can accurately respond to the reaction force of the piston 14 and efficiently apply an equal pressing force to both friction pads 8 and 9 at all times.

Also, the uplift that occurs on the disk insertion side of the caliper 10 during this braking is caused by the upper wall 1 of the pin fitting groove 19.
It is reliably regulated by the cylindrical base 20a of the sliding pin 20, which is closely fitted to the lower wall 19c and the sliding pin 9b.

When the brake is released, the bent support arm 5 on the disk rotation side returns to its original shape, and in conjunction with this, the caliper 10 also moves to the disk rotation side via the sliding pin 17 and returns to its original position. . At this time, the pin fitting part 15 on the disk rotation side is connected to the pin fitting groove 19.
is smoothly guided and slid by the cylindrical base 20a,
The sliding pins 17, 20 can smoothly slide within the support holes 5a, 4a without tilting the sliding pin 20 in the moving direction, and the brake can be released quickly. In addition, vibrations of the caliper 10 that occur due to vibrations of the vehicle body during driving are absorbed by the spring force of the elastic locking member 21, and no rattling occurs.

As described above, according to the present invention, the cylindrical base of the sliding pin, which is slidably inserted into the support hole of the bracket, is slid into the pin fitting groove formed in the pin mounting part on the disk rotation side of the caliper. The sliding pin is closely fitted in a movable manner, and its base end protrudes from the pin fitting groove, and an elastic locking member is compressed between the base end of the sliding pin and the pin mounting portion on the disk insertion side. The elastic locking member urges the sliding pin in the disk axial direction to press the flange part to the pin mounting part, and the disc rotation side pin mounting part of the caliper is pressed against the sliding pin in the disc axial direction and the disc Since the caliper is elastically supported so that it can move relatively in the rotational direction, the caliper moves in the disk rotational direction following the deflection of the bracket due to the braking torque during braking, and the pair of sliding pins are not subjected to side pressure due to the braking torque and move smoothly. The caliper can slide through the support hole, preventing uneven wear of the friction pads, exerting strong braking force, and reliably preventing the caliper from lifting during braking. Furthermore, when the brake is released, the bent bracket returns to its original shape, and the caliper moves toward the disk rotation side without pressing the sliding pin on the disk rotation side and returns to its original position. The pin can slide smoothly through the support hole, and the brake can be released quickly and the friction pad does not drag.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially vertical plan view, and FIG. 2 is a front view in cross section taken from FIG. 1. 4 and 5 are support arms, 4a and 5a are support holes, and 10
is a caliper, 11 is an inner part, 12 is an outer part, 17 and 20 are sliding pins, 19 is a pin fitting groove,
20a is a cylindrical base, and 21 is an elastic locking member.

Claims (1)

[Scope of utility model registration request] Disk rotation of a caliper having an inner part equipped with a pressing means for pressing the back surface of one friction pad and an outer part abutting against the back surface of the other friction pad, straddling friction pads arranged facing each other on both sides of the disc. In a disc brake device for a vehicle, a sliding pin is attached to the pin mounting part on the side and the disc rotation side in parallel to the disc axis direction, and the sliding pin is slidably inserted into a support hole provided in the bracket, A pin fitting groove that is open in the disk rotation direction is formed in the disk rotation side pin attachment part of the caliper, and the cylindrical base of the disk rotation side sliding pin can be slid into the pin fitting groove. The sliding pin is closely fitted, and its base end protrudes from the pin fitting groove, and an elastic locking member is compressed between the base end of the sliding pin and the pin mounting portion on the disk insertion side, and the sliding The flange of the sliding pin is pressed against the pin mounting part by pressing the pin in the disc axial direction, and the pin mounting part on the disc rotation side of the caliper can be moved relative to the sliding pin in the disc axial direction and the disc rotation direction. A disc brake device for a vehicle characterized by being elastically supported.