Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1999-06-10
2001-10-09
DePumpo, Daniel G. (Department: 3611)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S073100, C188S071300, C188S071500
Reexamination Certificate
active
06298953
ABSTRACT:
This invention is concerned with a disc brake, for example a disc brake suitable for use in braking a wheel of a vehicle.
A conventional disc brake for a vehicle comprises a disc, friction material pads arranged on opposite sides of the disc, and an operating mechanism operable to move one of the pads into contact with the disc, and to cause relative movement between the operating mechanism and the disc to bring the other pad into contact with the disc so that the pads both apply a braking force thereto. In most cases, the disc is fixedly mounted on a hub and said relative movement is brought about by movement of the operating mechanism which is mounted so that it can slide axially of the disc. It is also possible for the operating mechanism to be fixed relative to the hub and for the disc to be slidable axially on the hub. In the latter case, there may be two or more discs slidable on the hub, and an appropriate number of pads located between the discs so that the operating mechanism can cause all the pads to contact a disc.
In a conventional disc brake as referred to above, the operating mechanism comprises a support body located on one side of the disc, a cylinder defined by the support body, and a piston in the cylinder. The piston is movable, when fluid under pressure is introduced into the cylinder, to urge a first of said pads towards the disc. The operating mechanism also comprises a guidance member projecting from the support body past the disc and supporting an abutment on which the second of said pads is mounted. Said abutment may be attached to the guidance member or may be part thereof. Said first pad is mounted for sliding movement on the guidance member.
In a conventional disc brake as referred to above, the guidance member of the operating mechanism is subject to high bending and shearing reaction forces, when the brake is applied. The bending forces result from the pressure between the pads and the disc. The shearing forces are circumferential forces and are generated by the frictional contact between the pads and the disc which are transferred to the guidance member and thence to the support body. This means that the guidance member is made from expensive high tensile material and, as it has a relatively complex shape, including accurate guidance surfaces for the brake pad, this makes the guidance member difficult and expensive to make.
The invention provides a disc brake comprising a disc, friction material pads arranged on opposite sides of the disc, and an operating mechanism operable to move one of the pads into contact with the disc, and to cause relative movement between the operating mechanism and the disc to bring the other pad into contact with the disc so that the pads both apply a braking force thereto, the operating mechanism comprising a support body located on one side of the disc, a cylinder defined by the support body, and a piston in the cylinder, the piston being movable, when fluid under pressure is introduced into the cylinder, to urge a first of said pads towards the disc, the operating mechanism also comprising a guidance member projecting from the support body past the disc and supporting an abutment on which the second of said pads is mounted, said first pad being mounted for sliding movement on the guidance member, characterised in that the guidance member of the operating mechanism is mounted on the support body thereof by means of a plurality of bolts which extend through bores in the guidance member from the support body to said abutment.
In a disc brake in accordance with the invention, the bending and shearing forces applied to the guidance member are taken by the bolts which can be readily and cheaply obtained with the ability to take high loads so that the guidance member itself can be made from lower strength material which is cheaper and more easy to machine.
Preferably, the bolts are received in threaded bores in either the abutment or the support body. This avoids the necessity for nuts.
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Patent Abstracts of Japan, vol. 006, No. 172 (M-154), Sep. 7, 1982 & JP 57 083733A (Akebono Brake Ind. Co. Ltd), May 25, 1982, see abstract and figures.
European Patent Office, Patent Abstracts of Japan, publication No. 57083733, published May 25, 1982 entitled “Caliper for Disc Brake” (Yutaka), assigned to Akebono Brake Ind. Co. Ltd.
Delphi Technologies Inc.
DePumpo Daniel G.
Divine David
Synnestvedt & Lechner LLP
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