Laminated Shim Hook Sliding Interface for Disc Brake Noise
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Solution Overview
Problem
Conventional laminated shims for disc brakes generate undesired brake noise due to high frictional resistance between the pressing member side shim and the backing plate, as the hooks are directly attached, preventing smooth sliding.
Innovation Solution
The laminated shim design features hooks on the pressing member side shim that extend over and slidably contact the external surfaces of the pad side shim hooks, reducing frictional resistance by using a metal plate material and incorporating a neck and contact portion with elastic deformation capabilities, allowing smooth sliding along the surface direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pressing member side shim hooks are directly attached to the peripheral edge of the backing plate, then the attachment strength is improved, but the frictional resistance increases causing brake noise
Solution Approach 1:
The pad side shim hooks serve as an intermediary element between the pressing member side shim hooks and the backing plate. The pressing member side shim hooks extend over the pad side shim hooks, creating a sliding contact interface that reduces frictional resistance and eliminates brake noise while maintaining attachment strength through the dual-hook configuration.
2Device complexity
If the pressing member side shim hooks are directly attached to the backing plate, then the structural simplicity is improved, but the sliding smoothness deteriorates
Solution Approach 1:
The pad side shim hooks act as a mediator that enables smooth sliding motion. By extending the pressing member side shim hooks over the pad side shim hooks rather than directly to the backing plate, the design achieves both structural simplicity and sliding smoothness through the laminated configuration.
Solution Approach 2:
The invention changes the friction parameter by introducing a sliding contact interface between the two shim layers. The pad side shim hooks provide a low-friction surface that allows the pressing member side shim to slide smoothly, transforming the high-friction direct contact into a low-friction laminated sliding contact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses brake noise by reducing frictional resistance, enabling the pressing member side shim to slide easily with the piston or caliper claws relative to the pad and backing plate, thereby minimizing noise during displacement.
Implementation Method 1
incorporating a neck and contact portion with elastic deformation capabilities, allowing smooth sliding along the surface direction
Data Source
AI summary
A laminated shim for a disc brake has a pad side shim and a pressing member side shim. The pad side shim is provided at a backside of a backing plate of pad. The pressing member side shim is disposed between the pad side shim and a pressing member used for pressing the pad against a rotor. The pad side shim has hooks that extend over and are hooked onto a peripheral edge of the backing plate. The pressing member side shim has hooks that extend over a surface of a respective pad side hook. The pressing member hooks are slidably contacted to the top of the hooks of the pad side shim so as to be easy to slide in a surface direction with respect to the pad side shim and the backing plate of the pad.