Drum brake assembly
AssigneeBBA Group Limited
InventorAllan M. Lang
Life of this patent
Estimating the term…
Abstract
A drum brake assembly has brake shoes 2 and 3 within a rotatable drum 1. The shoes 2 and 3 are displaceable to effect braking by an hydraulic ram 7 and free ends 9 of the shoes react against an abutment 10. This reaction is effected through a layer of viscoelastic damping material and metal plate laminate 110 which may be carried by either the brake shoes or the abutment 10. The viscoelastic layer may be bonded between steel plates and secured by a spring clip to either the brake shoe or the abutment 10. Alternatively the viscoelastic layer may be bonded to the abutment 10. The laminate 110 can be accommodated within a recess in the abutment 10. The provision of the viscoelastic layers through which the brake shoes react on the abutment 10 alleviates the development of noise or squeal during use of the brake assembly.
Claims13
A drum brake assembly compising a rotatable brake drum having an interior cylindrical surface;
- a brake shoe within the drum;
- actuating means for displacing the shoe into engagement with said cylindrical surface for braking the drum;
- said shoe having a free end, remote from the actuating means, which reacts during braking against an abutment relative to which the drum is rotatable, a metal plate, interposed between said free end of the brake shoe and said abutment, with which the free end of the shoe is in direct abutting and slidin contact and a resilient damping material interposed between said plate and said abutment and sandwiched between a metallic surface of said metal plate and a further metallic surface and bonded or adhesively secured to at least one of said metallic surfaces to form a laminate therewith, through which resilient damping material said reaction is effected to alleviate noise of operation of the assembly and a clip forming part of said laminate having two opposed legs engaging the brake shoe or the abutment to retain the laminate thereon and having a bridging portion transversely joining said opposed legs and defining said plate, and
- wherein the clip is integrally formed with the plate to which the damping material is secured.
Dependencies are inferred from the claim text.