JPH0545267U - Car disc mounting structure for disc brakes for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] To minimize the deviation between the center of the cylinder hole of the caliper and the effective radius so that the predetermined braking force set for the disc brake can be obtained. [Structure] Caliper bracket 4 supporting caliper 7
And the front fork 3 serving as a vehicle body are fixed by the two connecting portions 10 and 12. Among them, the connecting portion 12 on the inner peripheral side of the disc is arranged on the disc radial direction line L1 connecting the center O1 of the disc rotor 2 and the thrust center O2 of the pistons 15, 15, 16 so that the caliper caused by a manufacturing error. The range in which 7 deviates from the regular mounting position is suppressed to be smaller than the conventional one, and the centers of the pistons 15, 15, 16 are
The braking force is set in the vicinity of the effective radius R1 so that the braking force falls within the set allowable range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake mounted on a vehicle such as a motorcycle, a motorcycle, a three- or four-wheeled buggy, and the like, and more particularly, to a structure for mounting a caliper used for the disc brake on a vehicle body.

[0002]

[Prior Art]

 In a conventional motorcycle disc brake, a connecting portion between a caliper bracket for fixing the caliper to the vehicle body and a fork that serves as the vehicle body is supported at two locations, that is, the disc feeding side of the caliper and the disc inner peripheral side. (See, for example, Japanese Utility Model Laid-Open No. 2-65725).

[0003]

[Problems to be solved by the device]

 By the way, one of the factors that determines the braking force of the disc brake is the radius line connecting the piston center and the disc rotor center, that is, the effective radius. In order to obtain the braking force set for the disc brake, the piston center Must be placed on the effective radius. However, the connection between the vehicle body and the caliper, which determines the mounting position of the caliper, may be displaced from the predetermined position due to manufacturing error. In particular, in a multi-pot type caliper having a plurality of cylinder holes and long in the circumferential direction of the disc, a slight manufacturing error greatly affects the placement of the piston, and the piston center is largely displaced from the effective radius.

The present invention has been made in view of such an actual situation, and an object thereof is to suppress a deviation between a piston center and an effective radius as small as possible, and to set a predetermined control set on a disc brake. The purpose is to provide a caliper mounting structure that can obtain power.

[0005]

In order to achieve the above object, the present invention provides a vehicle in which a caliper, in which a piston for pressing a friction pad against a side surface of a disc rotor is inserted in a cylinder hole of an action portion, is attached to a vehicle body. In the caliper mounting structure of the disc brake for vehicle, one of the connecting portions for fixing the caliper to the vehicle body is arranged near a disc radial line connecting the thrust center of the piston and the center of the disc rotor. Is characterized by.

[0006]

[Action]

 If the connecting part between the caliper and the vehicle body is slightly displaced from the normal position due to the influence of manufacturing error, one of the connecting parts is the disk radius connecting the thrust center of the piston and the center of the disk rotor as described above. Near the directional line, caliper misalignment is small such that movement of the piston bore center is limited to a limited range around the intersection of the disc radial line and the effective radius.

[0007]

【Example】

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

A disc brake 1 for a motorcycle includes a caliper bracket 4 fixed to a rear side of a front fork 3 on one side of a disc rotor 2 rotating in a direction of an arrow A, and a pair of slides on the caliper bracket 4. It has a caliper 7 which is cantilevered via pins 5 and 6, and a pair of friction pads 8 which are arranged opposite to each other on both sides of the disk rotor 2.

The caliper bracket 4 is a substantially L-shaped portion on the disc payout side of the caliper 7 and from the outside of the disc rotor 2 to the end of the caliper 7 on the disc turn-in side through the inner circumference side of the working portion 7 a of the caliper 7. And the connecting portion 10 fixed to the one arm portion 3a protruding from the front fork 3 with the mounting bolt 9 at the end on the disc advancing side and the disc advancing side. Is also provided on one side of the disk rotor 2 as described above at two locations, namely, the connecting portion 12 fixed to the other arm portion 3b of the front fork 3 with the mounting bolt 11. Of these, the connecting portion 12 on the inner peripheral side of the disc is a center O1 of the disc rotor 2, a thrust center O2 of three pistons 15, 15, 16 described later, and a center small-diameter pie which is also the center of the caliper 7 in this embodiment. It is arranged on a disc radial direction line L1 connecting the center of the tongue 16.

A caliper support arm 4 a that straddles the outer periphery of the disc rotor 2 is provided in the vicinity of the connecting portion 10 on the disc delivery side of the caliper bracket 4, and a bag-shaped insertion hole 4 b is formed in the support arm 4 a. And one sliding pin 5 is projected at the end portion on the inner peripheral side of the disk.

The caliper 7 has a structure in which an action portion 7 a and a reaction portion 7 b arranged on both sides of the disc rotor 2 are connected by a bridge portion 7 c that straddles the outer circumference of the disc rotor 2. Three large and small cylinder holes 13, 13 and 14 are arranged side by side in the inner peripheral direction of the disk in the action portion 7a, and the pistons 15, 15 and 16 are liquid-tight in these cylinder holes 13, 13 and 14, respectively. The hydraulic chambers 17, 17 and 18 are movably fitted and defined between the pistons 15, 15 and 16 and the bottoms of the cylinder holes 13, 13 and 14, respectively. A plurality of reaction force claws 7d are extended on the reaction portion 7b, and the friction pads 8, 8 described above are arranged between the pistons 15, 15, 16 and the reaction force claws 7d so as to sandwich the disc rotor 2 therebetween. It is set up.

A pair of vehicle body mounting arms 7e and 7f are provided on the action portion 7a in a protruding manner, and the caliper 7 slides one side into an insertion hole 7g formed in the vehicle body mounting arm 7e on the disc entry side. Insert the pin 5 and insert the other sliding pin 6 protruding from the vehicle body mounting arm 7f on the disc feed-out side into the insertion hole 4b of the caliper support arm 4a so as to be movable in the disc axial direction. To be done.

Each of the hydraulic chambers 17, 17 and 18 communicates with a separately-known publicly-known hydraulic master cylinder, which is not shown, so that the hydraulic fluid generated in the hydraulic master cylinders can be communicated with these hydraulic chambers 17. , 17, 18 respectively, the pistons 15, 15, 16 move the cylinder holes 13, 13, 14 to the disk rotor side, respectively, and the one friction pad 8 is pressed to one side surface of the disk rotor 2. .. Next, due to this reaction force, the caliper 7 moves toward the action portion 7a while being guided by the sliding pins 5 and 6, and the reaction force claw 7d of the reaction portion 7b causes the other friction pad 8 to move to the other side of the disc rotor 2. By pushing it to the side, braking action is performed.

In this embodiment, the front fork 3 and the caliper bracket 4 have the connecting portion 10 on the disc feeding side at the same position as the conventional one and the connecting portion 12 on the inner peripheral side of the disc. , Is arranged on a disk radial line L1 connecting the center O1 of the disk rotor 2 and the thrust center O2 of the pistons 15, 15, 16. There is a possibility that these connecting portions 10, 12 may be arranged outside the set position due to manufacturing errors in the mounting bolts 9, 11 and screw holes. This is similar to the present embodiment in which the connecting portion 12 on the inner peripheral side of the disc is arranged on the disc radial direction line L1 as described above, and the connecting portion 12 is similarly arranged at a position largely deviated from the line L1. In comparison with the example, in the hypothetical example, the caliper bracket 4 and the caliper 7 disengage in the entire circumferential direction with the connecting portions 10 and 12 as fulcrums due to the manufacturing error of the connecting portions 10 and 12, and the piston All the centers of 15, 15 and 16 deviate from the effective radius R1 having the center O1 of the disk rotor 2 as a fulcrum in the entire circumferential direction with a manufacturing error. In particular, as a characteristic deviation in this virtual example, the centers of the pistons 15, 15, 16 may move in parallel to the outside or inside of the effective radius R1, and the braking force set for the disc brake 1 can be obtained. It gets harder.

On the other hand, in the present embodiment, since the connecting portion 12 on the inner peripheral side of the disc is arranged on the disc radial direction line L1, the caliper 7 supported by the caliper bracket 4 is provided. The discrepancy of the disc radius is the disc radius connecting the thrust center O2 of the pistons 15, 15, 16 with the center O1 of the disc rotor 2 when there is a manufacturing error similar to that of the virtual example in both the connecting portions 10 and 12. It is restricted to a limited and narrow range of movement around the intersection of the direction line L1 and the effective radius R1. For this reason, the centers of the three pistons 15, 15, 16 are at least one of which is located very close to the effective radius R1, and the other one or two are also located near the effective radius R1. It is arranged inside and outside with the effective radius R1 sandwiched.

In this way, in the present embodiment, even when there is a manufacturing error in the mounting bolts 9 and 11 and the screw holes that form the connecting portions 10 and 12, the caliper 7 is less displaced, and each piston 15 is moved. , 15 and 16 can be positioned near the effective radius R1 so as to be within the allowable range set for the disk break 1. Further, as a result, when the disc brake 1 is mounted on many front forks 3, the variation in the braking force is reduced as compared with the conventional example, so that the reliability of the braking performance of the vehicle is improved.

In the above embodiment, since the caliper is a pin slide type in which the pair of sliding pins are guided in the disc axial direction, the description has been made by connecting the fork and the caliper bracket. For piston facing type that does not move to, the target is the connecting part that directly connects the caliper and the vehicle body such as a fork. Further, since the present invention is premised on the caliper being displaced from the normal mounting position due to a manufacturing error in the connecting part, the connecting part is located near the radial line of the disc connecting the thrust center of the piston and the center of the disc rotor. I hope

[0018]

[Effect of the device]

 As described above, the present invention arranges one of the connecting portions for fixing the caliper to the vehicle body in the vicinity of the radial line of the disc connecting the thrust center of the piston and the center of the disc rotor. Even if there is a manufacturing error in the components attached to the, the range in which the caliper deviates from the regular mounting position becomes small, so that the center of the piston should be located near the effective radius and fall within the allowable range set for the disc brake. You can In addition, when this disc brake is mounted on many vehicles, the variation in braking force is reduced compared to the conventional example, so stable braking force can be exerted, and the reliability of vehicle braking performance is improved. Will increase.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a disc brake according to an embodiment of the present invention is mounted on a vehicle body.

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

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along the line IV-IV in FIG.

[Explanation of symbols]

1 ... Disc brake, 2 ... Disc rotor, 3 ... Front fork, 3a, 3b ... Arm part, 4 ... Caliper bracket, 4a ... Caliper support arm, 4b ... Insertion hole, 5, 6 ...
Sliding pin, 7 ... Caliper, 7a ... Working portion, 7b ... Reaction portion, 7e, 7f ... Car body mounting arm, 7g ... Insertion hole, 8 ... Friction pad, 9, 11 ... Mounting bolt, 10 ... Disc extension side Connection part, 12 ... connection part on the inner peripheral side of the disk, 13,
13, 14 ... Cylinder hole, 15, 15, 16 ... Piston, O1 ... Center of disk rotor 2, O2 ... Piston 1
5, 15 and 16 thrust center, L1 ... Disk radial direction line connecting center O1 of disk rotor 2 and thrust center O2 of pistons 15, 15 and 16, R1 ... Effective radius

Claims (1)

[Scope of utility model registration request] 1. A caliper mounting structure for a vehicle disc brake, wherein a caliper, in which a piston for pressing a friction pad against a side surface of a disc rotor is inserted in a cylinder hole of an action portion, is mounted on a vehicle body. A caliper mounting structure for a vehicle disc brake, wherein one of the portions is disposed in the vicinity of a disc radial direction line connecting the thrust center of the piston and the center of the disc rotor.