Vehicular disc brake

Patent metadata

Field	Value
Publication number	US-12066066-B2
Application number	US-201917055449-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 15, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

The vehicular disc brake comprises a caliper bracket 3 , a caliper body 6 attached to the caliper bracket 3 , and friction pads 7, 7 disposed on both sides of a disc rotor 2 , and the caliper body 6 comprises an action part 6 a provided with cylinder holes 6 f, 6 g through which a large-diameter piston 10 and a small-diameter piston 11 are inserted, and a bridge part 6 c extending across the outer periphery of the disc rotor 2 . Thinned parts 6 n, 6 p are provided respectively in positions corresponding to the pistons 10, 11 in a disc-radially inner wall 6 i of the bridge part 6 c . The volume of the thinned part 6 b corresponding to the large-diameter piston 10 on the disc turn-out side when the vehicle is moving forward is less than the volume of the thinned part 6 p corresponding to the small-diameter piston 11 on the disc turn-in side.

First claim

The invention claimed is:

1. A vehicular disc brake comprising a caliper bracket mounted to a vehicle body fixedly, a caliper body attached to the caliper bracket, and friction pads disposed in both sides of a disc rotor, each of the friction pad having a lining and a back plate, wherein an ear piece formed on each of the friction pads is slidably supported by a pad guide groove extending in a disc shaft direction formed in the caliper bracket or the caliper body, and wherein the caliper body has an action part with a plurality of cylinder holes into which a plurality of pistons is inserted and a bridge part extending across an outer periphery of the disc rotor,
wherein thinned parts are provided in positions corresponding to the pistons in a disc-radially inner wall of the bridge part and a volume of one of the thinned parts on a disc turn-in side in forward movement of a vehicle is different from a volume of another of the thinned parts on a disc turn-out side,
wherein one of the pistons that is disposed closest to the disc turn-out side in forward movement of the vehicle is formed to have a larger diameter than the other pistons and one of the thinned parts that corresponds to the one of the pistons that has the larger diameter and is disposed closest to the disc turn-out side has a smaller volume than the other thinned parts, and
wherein a central line in a disc peripheral direction of the lining is formed so as to be offset to the disc turn-out side with respect to a cylinder hole middle line that connects a center of the disc rotor to a middle point between a center of one of the cylinder holes into which the one of the pistons that has the larger diameter is inserted and a center of one of the cylinder holes into which another of the pistons disposed closest to the disc turn-in side in forward movement of the vehicle is inserted.

2. The vehicular disc brake according to claim 1 ,
wherein a disc turn-out side end part and a disc turn-in side end part in forward movement of the vehicle of the disc-radially inner wall of the bridge part project toward a disc-radially inner side beyond a disc-radially outer surface of the pad guide groove.

3. The vehicular disc brake according to claim 2 ,
wherein the disc-radially inner wall of the bridge part is formed to have a shape corresponding to a shape of the disc-radially outer surface of each of the friction pads.

4. The vehicular disc brake according to claim 1 , wherein each of the friction pads has the ear piece on the disc turn-out side in forward movement of the vehicle and a suspension piece on the disc turn-in side, a hanger pin that extends in the disc shaft direction across the outer periphery of the disc rotor is inserted into the suspension piece, a pad spring having a pad resilient piece that extends to the disc turn-out side and makes contact with a disc-radially outer surface of the friction pad is provided on the disc turn-in side of the disc-radially inner wall of the bridge part, and the pad resilient piece is disposed in the one of the thinned parts on the disc turn-in side.

5. A vehicular disc brake comprising a caliper bracket mounted to a vehicle body fixedly, a caliper body attached to the caliper bracket, and friction pads disposed in both sides of a disc rotor, each of the friction pad having a lining and a back plate, wherein an ear piece formed on each of the friction pads is slidably supported by a pad guide groove extending in a disc shaft direction formed in the caliper bracket or the caliper body, and wherein the caliper body has an action part with a plurality of cylinder holes into which a plurality of pistons is inserted and a bridge part extending across an outer periphery of the disc rotor,
wherein thinned parts are provided in positions corresponding to the pistons in a disc-radially inner wall of the bridge part and a volume of one of the thinned parts on a disc turn-in side in forward movement of a vehicle is different from a volume of another of the thinned parts on a disc turn-out side,
wherein a disc turn-out side end part and a disc turn-in side end part in forward movement of the vehicle of the disc-radially inner wall of the bridge part project toward a disc-radially inner side beyond a disc-radially outer surface of the pad guide groove, and
wherein each of the friction pads has the ear piece on the disc turn-out side in forward movement of the vehicle and the suspension piece on the disc turn-in side, the hanger pin that extends in the disc shaft direction across the outer periphery of the disc rotor is inserted into the suspension piece, and the disc turn-out side end part of the disc-radially inner wall of the bridge part is provided with a pad detachable groove that makes the friction pads slidable in a longitudinal direction of the friction pads with the hanger pin removed.

6. The vehicular disc brake according to claim 5 ,
wherein the pad detachable groove is formed in parallel to the disc-radially outer surface of the pad guide groove.

7. The vehicular disc brake according to claim 5 ,
wherein one of the pistons that is disposed closest to the disc turn-out side in forward movement of the vehicle is formed to have a larger diameter than the other pistons and
one of the thinned parts that corresponds to the one of the pistons that has the larger diameter and is disposed closest to the disc turn-out side has a smaller volume than the other thinned parts.

Assignees

• Nissin Kogyo Kk
• Hitachi Astemo Ltd

Inventors

• Shiraishi Yosuke

Classifications

• F16D2121/04

  acting on a piston-type actuator, e.g. for liquid pressure · CPC title

• F16D2055/0016

  Brake calipers · CPC title

• F16D2055/0008

  Brake supports · CPC title

• F16D65/0974

  acting on or in the vicinity of the pad rim in a direction substantially transverse to the brake disc axis · CPC title

• F16D65/0087

  Brake housing guide members, e.g. caliper pins; Accessories therefor, e.g. dust boots · CPC title