JP2554958Y2 - Multi-pot opposed caliper body for vehicle disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper body of a disc brake used for various traveling vehicles such as motorcycles and automobiles, and more particularly, a multi-pot opposed type in which uneven wear of a friction pad is prevented as much as possible. About the caliper body.

[0002]

2. Description of the Related Art In a vehicle disc brake in which a rotating action is performed by pressing both sides of a rotating disc rotor with a pair of friction pads, a disc reciprocating side of the friction pad is drawn into the disc rotor by a leading action. In some rare cases, the wear may occur earlier than in other parts. For example, a technique disclosed in Japanese Utility Model Laid-Open No. 2-76235 has been proposed.

In this caliper body, a plurality of sets of cylinder holes opposed to each other with a disk rotor interposed therebetween are arranged in both working portions disposed on both sides of the disk rotor in the disk circumferential direction, and are accommodated therein. A multi-pot facing type that defines a hydraulic chamber between the piston and the bottom of the cylinder hole,
The opposed hydraulic chambers communicate with each other through a liquid passage, and a hydraulic pressure supply valve connected to the disk inlet-side liquid passage is provided with a pressure reducing valve, so that the hydraulic chamber on the disk inlet side is connected to the hydraulic chamber. By reducing the hydraulic pressure of the supplied hydraulic fluid from the hydraulic pressure supplied to the other hydraulic chambers, uneven wear of the friction pad is prevented.

[0004]

However, such a configuration is not preferable because a decrease in hydraulic pressure directly reduces the clamping force of the friction pad against the disk rotor. Further, since the liquid passage is divided into a plurality of parts, the structure becomes complicated, and an expensive pressure reducing valve is used.

The present invention has been made in view of the above circumstances, and prevents uneven wear of a friction pad due to a leading action with a cheap and simple structure while securing a predetermined clamping force on the friction pad. It is an object of the present invention to provide a caliper body of a disc brake for a vehicle that can perform the above operation.

[0006]

SUMMARY OF THE INVENTION In accordance with the above-mentioned object, according to the present invention, a plurality of sets of cylinder holes opposed to each other with the disk rotor interposed therebetween are formed in both working portions disposed on both sides of the disk rotor. Side by side, a hydraulic chamber is defined between the piston accommodated in each cylinder hole and the bottom of the cylinder hole, respectively, and a union hole formed on the disc outlet side of the caliper body, A multi-pot opposed caliper body for a disc brake for a vehicle, in which a hydraulic passage communicating with a hydraulic chamber on the disc outlet side is communicated with a hydraulic passage, and hydraulic chambers adjacent in the circumferential direction of the disk are communicated with each other through a hydraulic passage. The plurality of liquid passages provided in each of the action portions,
It is characterized in that the diameter is gradually reduced from the disk feeding side to the disk feeding side.

[0007]

[Function] The pressurized hydraulic fluid introduced from the union hole is
Due to the choke action of the liquid passage, the flow rate is reduced each time through the hydraulic pressure chamber to the disk inflow side, and the pressure rise time becomes slower as the hydraulic pressure chamber approaches the disk inflow. As a result, the piston accommodated in the cylinder hole is sequentially pushed out from the disk outlet side, and the piston on the disk inlet side is pushed out the latest.

In this structure, the pistons arranged in the circumferential direction of the disk are pushed out with a delay as they move toward the disk reciprocating side. The same hydraulic pressure acts on each piston, and the friction is increased. Press the pad back plate evenly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

A caliper body 2 used in the disc brake 1 is provided with a disc rotor 3 from outside the disc rotor 3 rotating in the direction of arrow A to a pair of working portions 2a and 2b divided on both sides of the rotor 3. 3 facing across
A pair of cylinder holes 4, 4, 5, 5, 6, 6 are arranged side by side in the circumferential direction of the disc, and are opposed to each other in a 6-pot type.
Are integrally connected by four long and short connection bolts 7 screwed into the disk reversing side and the disk reversing side of the bridge portion 2c.

A rectangular ceiling opening 8 is formed at the center of the bridge 2c. On the disk rotor side of the action portions 2a, 2b, pad mounting recesses 9, 9 are provided continuously inside the ceiling opening 8, and the pad mounting recesses 9, 9 are provided.
9, a pair of friction pads 10, 10 are arranged to face each other with the disk rotor 3 interposed therebetween. The friction pad 10 includes a lining 11 and a metal back plate 12, and is hung so as to be movable in the disk axial direction by inserting a hanger pin 13 into an upper portion of the back plate 12.

Six cylinder holes 4, 4, 5, 5, 6, 6
All have the same diameter, and cup-shaped pistons 14 are accommodated in the cylinder holes 4 to 6, respectively. Hydraulic chambers 15, 15, 16, 16, 17, 17 are defined between the bottoms of the cylinder holes 4 to 6 and the piston 14, and the two hydraulic chambers 15, 15 on the disk outlet side are The bridge portion 2c communicates with a liquid passage 18 which is formed around the disk outlet side. In each of the action sections 2a and 2b, the adjacent hydraulic chambers 15 on the disk outlet side and the central hydraulic chamber 16 communicate with each other through a liquid passage 19, and further, the central hydraulic chamber 16 and the disk inlet side are connected. And a fluid passage 20.

A bracket 2d for mounting the vehicle body and a union boss 2e are integrally formed on one of the action portions 2a, and a union hole 21 formed in the union boss 2e is formed.
Communicates with the liquid passage 18 on the disc outlet side. The union hole 21 and the liquid passage 18 on the disc outlet side are large diameter holes having substantially the same diameter, and an intermediate liquid passage 19 connecting the hydraulic chambers 15 and 16 is a liquid passage on the disk outlet side. The liquid passage 20 on the disk inlet side connecting the hydraulic chambers 16 and 17 to a medium diameter hole slightly smaller than the diameter 18 is a small diameter hole narrowed to a smaller diameter than the intermediate liquid passage 19.

The union hole 21 is connected to a well-known hydraulic master cylinder separately provided through a brake hose (both not shown). The hydraulic fluid is filled in the hydraulic path up to the chambers 17 and 17. The hydraulic fluid generated in the hydraulic master cylinder by the driver's brake operation is introduced into the union hole 21 through the brake hose, further branches off the hydraulic passage 18 and enters the hydraulic chambers 15, 15 on the disc outlet side. Each of the action parts 2a and 2b is supplied to the disk revolving side.

The hydraulic fluid supplied to the hydraulic chamber 15 on the disk outlet side is also supplied to the central hydraulic chamber 16 and the hydraulic chamber 17 on the disk inlet side through the liquid passages 19 and 20 at the same time. From the hydraulic chamber 15 on the disk outlet side to the central hydraulic chamber 16
The flow rate to the liquid passage 1 on the disk outlet side is controlled by the liquid passage 19 having an intermediate hole smaller than the liquid passage 18 on the disk outlet side.
8 from the hydraulic chamber 15 to the hydraulic chamber 15, and the flow rate from the central hydraulic chamber 16 to the hydraulic chamber 17 on the disk inlet side is:
The liquid passage 20 having a smaller diameter than the intermediate liquid passage 19 is further narrowed down from the intermediate liquid passage 19 to the hydraulic chamber 16.

As a result, the pressure rise time of the central hydraulic chamber 16 is slower than that of the hydraulic chamber 15 on the disk outlet side, and the hydraulic chamber 16 on the disk inlet side is further increased in pressure.
The boosting time is later than that. Then, the pistons 14 housed in the respective discs are pushed out in the order of the disc feeding side, the center, and the disc feeding side, and push the back plate 12 of the friction pad 10 to move the lining 11 to the side surface of the disc rotor 3. To make sliding contact. The same hydraulic pressure acts on each piston 14 from the hydraulic fluid in each of the hydraulic chambers 15 to 17, and the friction pad 10 is pressed by the six pistons 14 with an equal force.

In this embodiment, the friction pad 1
By gradually delaying the pushing of the piston 14 with respect to 0 toward the disk entry side, which is susceptible to the leading action, uneven wear of the lining 11 due to the leading action can be prevented as much as possible. Also, since the set hydraulic pressure is applied to all the pistons 14,
There is almost no decrease in the clamping force on the friction pad 10.

[0018]

As described above, according to the present invention, a plurality of liquid passages provided in both working portions of the caliper body are formed to have a small diameter sequentially from the disk outlet side to the disk inlet side, and the friction is provided. The push of the piston against the pad goes to the disk inlet side, which is susceptible to the leading action.
By delaying sequentially, uneven wear of the lining can be prevented as much as possible.

Further, since the set hydraulic pressure is applied to all the pistons, a decrease in the clamping force on the friction pad hardly occurs. Furthermore, since the diameter of the liquid passage is merely changed, the structure is simpler than that of the conventional one in which the liquid passage is branched, and it is not necessary to use an expensive pressure reducing valve. can do.

[Brief description of the drawings]

FIG. 1 is a sectional plan view of a caliper body showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Caliper body 3 ... Disc rotor 2a, 2b ... Working part 2d ... Bracket for attaching to vehicle body 2e ... Union boss part 4 ... Cylinder hole on disc outlet side 5 ... Middle cylinder hole 6 ... Disc inflow Side cylinder hole 10: friction pad 11: lining of friction pad 10 12: back plate of friction pad 10 13: hanger pin 14: piston housed in cylinder holes 4, 5, 6 15: hydraulic pressure on disk outlet side Chamber 16: Intermediate hydraulic chamber 17: Hydraulic chamber on the disk inlet side 18 ... Hydraulic chamber on the disk outlet side communicating the hydraulic chambers 15, 15 and the union hole 21 19: Hydraulic chambers 15, 16 Intermediate fluid passage 20 communicating with the fluid pressure chambers 16 and 17 fluid passage on the disk retraction side 21 union hole A rotating direction of the disc rotor 3

Claims (1)

(57) [Scope of request for utility model registration] A plurality of sets of cylinder holes opposed to each other with the disk rotor interposed therebetween are provided in both working portions disposed on both sides of the disk rotor in the disk circumferential direction, and are accommodated in each cylinder hole. Hydraulic chambers are respectively defined between the piston and the bottom of the cylinder hole, and a union hole formed on the disc outlet side of the caliper body and a hydraulic chamber on the disc outlet side are used as a fluid passage. In the multi-pot opposed caliper body of the disk brake for a vehicle in which the hydraulic chambers adjacent to each other in the circumferential direction of the disk are communicated with each other through the liquid passage, the plurality of hydraulic fluids disposed in each of the action portions are provided. A multi-pot opposed caliper body for a disc brake for a vehicle, wherein a passage is gradually reduced in diameter from a disc outlet side to a disc inlet side.