Vehicle disc brake

Patent metadata

Field	Value
Publication number	US-9862362-B2
Application number	US-201514977745-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Dec 25, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

One embodiment provides a vehicle disc brake including: a caliper body; a caliper bracket having a pair of caliper support arms; a pair of friction pads; and a pad return spring. Each caliper support arm has a pair of pad guide grooves, and a pair of lug pieces extending from the friction pad are supported movably therein. An outer surface of each lug piece is stepped such that a projecting length on a radially outer side is shorter than a projecting length on a radially inner side, thereby defining a space portion between the lug piece and the pad guide groove. A first imaginary line, which is defined to pass a gravity center of the friction pad and to intersect perpendicularly a center line connecting a center of a disc rotor and a center of a piston, passes the space.

First claim

The invention claimed is:

1. A vehicle disc brake including:
a caliper body;
a caliper bracket which is fixed to a vehicle body, and which has a pair of caliper support arms extending to straddle an outer edge of a disc rotor in an axial direction thereof, each caliper support arm having a pair of pad guide grooves;
a pair of friction pads which is disposed at each side of the disc rotor, each friction pad having a backing plate, the backing plate having a pair of lug pieces extending from side portions thereof, the lug pieces being supported movably in the pad guide grooves; and
a pad return spring which is disposed between the lug pieces and the caliper support arms to bias the friction pad so as to move away from the disc rotor when the brake is released,
wherein an outer surface of each lug piece in a rotating direction of the disc rotor has a stepped shape in which a projecting length on a radially outer side is shorter than a projecting length on a radially inner side, and a space portion is defined between the radially outer side of the lug piece and the pad guide groove,
wherein the space portion is disposed in a position where a first imaginary line passes, the first imaginary line being defined to pass a gravity center of the friction pad and to intersect perpendicularly a center line connecting a center of the disc rotor and a center of a piston, and
wherein the gravity center of the friction pad lies further radially inwards than a center of the piston.

2. The vehicle disc brake of claim 1 ,
wherein the space portion is disposed in the position where a second imaginary line also passes, the second imaginary line being defined to pass the center of the piston and to intersect perpendicularly the center line.

3. The vehicle disc brake of claim 1 ,
wherein, in a first a state, the first imaginary line passes the gravity center of the friction pad and intersects perpendicularly the center line connecting the center of the disc rotor the center of the piston,
wherein, in a second state, the lug pieces are fixed within the pad guide grooves restricting generation of brake noise or squeal, and
wherein, in the second state, the space portion is disposed in a position where a second imaginary line passes the center of the piston and intersects perpendicularly the center line.

4. The vehicle disc brake of claim 1 ,
wherein the pad return spring is a non-linear characteristic spring in which biasing force changes as the friction pads move in the axial direction of the disc rotor.

5. A vehicle disc brake including:
a caliper body;
a caliper bracket which is fixed to a vehicle body, and which has a pair of caliper support arms extending to straddle an outer edge of a disc rotor in an axial direction thereof, each caliper support arm having a pair of pad guide grooves;
a pair of friction pads which is disposed at each side of the disc rotor, each friction pad having a backing plate, the backing plate having a pair of lug pieces extending from side portions thereof, the lug pieces being supported movably in the pad guide grooves; and
a pad return spring which is disposed between the lug pieces and the caliper support arms to bias the friction pad so as to move away from the disc rotor when the brake is released,
wherein an outer surface of each lug piece in a rotating direction of the disc rotor has a stepped shape in which a projecting length on a radially outer side is shorter than a projecting length on a radially inner side, and a space portion is defined between the radially outer side of the lug piece and the pad guide groove,
wherein the space portion is disposed in a position where a first imaginary line passes, the first imaginary line being defined to pass a gravity center of the friction pad and to intersect perpendicularly a center line connecting a center of the disc rotor and a center of a piston, and
wherein the pad return spring includes:
a locking portion which is locked on the lug piece;
a spring portion which is formed by bending back an extending piece which extends from the locking portion so as to move away from the disc rotor towards the disc rotor via a curved portion; and
an abutment portion which is provided at a distal end of the spring portion and which is brought into abutment with a side surface of the caliper support aim which lies opposite to a side surface facing the disc rotor.

6. The vehicle disc brake of claim 5 ,
wherein the locking portion is also disposed in the position where the first imaginary line passes.

7. The vehicle disc brake of claim 5 ,
wherein the locking portion of the pad return portion is disposed in a position where the first imaginary line passes, whereby when the brake is released, the friction pads are pulled back in a horizontal direction by means of the spring force of the pad return spring so that the friction pads can move away from the side surface of the disc rotor.

8. The vehicle disc brake of claim 5 ,
wherein the abutment portion is an arc-like shape whose side facing the caliper bracket is convex.

9. The vehicle disc brake of claim 5 ,
wherein the spring portion of the pad return spring is not disposed in the space portion defined between the lug pieces and the pad guide grooves.

10. A vehicle disc brake including:
a caliper body;
a caliper bracket which is fixed to a vehicle body, and which has a pair of caliper support arms extending to straddle an outer edge of a disc rotor in an axial direction thereof, each caliper support arm having a pair of pad guide portions;
a pair of friction pads which is disposed at each side of the disc rotor, each friction pad having a backing plate, the backing plate having a pair of lug pieces extending from side portions thereof, the lug pieces being supported movably in the pad guide portions; and
a pad return spring which is disposed between the lug pieces and the caliper support arms to bias the friction pad so as to move away from the disc rotor when the brake is released,
wherein the pad return spring includes:
a locking portion which is locked on the lug piece;
a first extending piece which extends from the locking portion so as to move away from the disc rotor via a first curved portion;
a second extending piece which is formed by bending back a distal end portion of the first extending piece towards the disc rotor via a second curved portion; and
an abutment portion which is provided at a distal end of the second extending piece and which is brought into abutment with a side surface of the caliper support arm which lies opposite to a side surface facing the disc rotor,

wherein the first extending piece is provided so as to be inclined gradually outwards of the friction pad from the first curved portion to the second curved portion in a free state in which the locking portion is locked on the lug piece, and
wherein, when the friction pad is assembled to the pad guide portions and the abutment portion is brought into abutment with the side surface of the caliper support arm which lies opposite to the side surface facing the disc rotor, the first extending piece comes near to a state in which the first extending piece is parallel to an axis of the disc rotor, and as the friction pad moves towards the disc rotor, the first extending piece comes nearer to the state in which the first extending piece is parallel to the axis of the disc rotor, thereby decreasing gradually a displacement amount thereof.

11. The vehicle disc brake of claim 10 ,
wherein a sectional area of the second extending piece is smaller than a sectional area of the first extending piece.

12. The vehicle disc brake of claim 10 ,
wherein a width of the s

Assignees

• Nissin Kogyo Kk

Inventors

• Kaneko Shinobu
• Kihara Shinichi
• Hirabayashi Masakazu
• Takahashi Michio

Classifications

• B60T1/065 Primary

  employing disc (B60T1/062 takes precedence) · CPC title

• F16D2055/0029

  Retraction devices · CPC title

• F16D65/0972

  transmitting brake reaction force, e.g. elements interposed between torque support plate and pad · CPC title

• F16D55/226 Primary

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• F16D55/22 Primary

  by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads · CPC title