Drum Brake Shoe Alignment Using Resilient Clips
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Solution Overview
Problem
Conventional drum brakes experience uneven wear and vibration-induced noise due to misalignment of brake shoes with the braking surface during vehicle movement over rough terrain.
Innovation Solution
The use of arcuate channels on brake shoes retained by clips attached to a disc ensures axial alignment with the braking surface, allowing radial movement while attenuating vibrations and noise through resilient engagement with the clips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If brake shoes are retained on backing plate through pins allowing lateral movement, then brake application function is achieved, but uneven wear patterns occur due to misalignment with braking surface
Solution Approach 1:
The patent introduces radial guides as intermediary components between the pins and brake shoes. These guides constrain the movement of brake shoes to follow a precise radial path, ensuring that the friction surfaces remain properly aligned with the braking surface while still allowing the necessary lateral movement for brake application. This mediator component resolves the contradiction by providing both movement freedom and alignment precision.
2Manufacturing precision
If brake shoes are rigidly aligned with braking surface, then alignment precision is improved, but vibration and noise occur during vehicle travel over rough terrain
Solution Approach 1:
The patent implements a dynamic retention system where brake shoes are held by pins that move within radial guides. This dynamic arrangement allows the brake shoes to adapt their position in response to vibrations from rough terrain while maintaining radial alignment with the braking surface. The system transitions from a static rigid connection to a dynamic constrained movement system, resolving the contradiction between precision alignment and vibration resistance.
3Manufacturing precision
If clips are used to retain arcuate channels on disc, then alignment with braking surface is maintained, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the clip components. The clips simultaneously retain the arcuate channels on the disc, maintain axial alignment of the friction surfaces with the braking surface, and provide resilient mounting to reduce vibrations. By merging alignment, retention, and vibration damping functions into a single component, the patent reduces overall device complexity while achieving precision alignment.
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 solution reduces noise and vibration in the brake system by maintaining friction surfaces in alignment with the braking surface, minimizing uneven wear and noise generation during vehicle travel over uneven terrain.
Implementation Method 1
resiliently attenuating of any vibration introduced into the brake system during travel of the vehicle over uneven terrain
Implementation Method 2
clip members each of which have a substantially rectangular shape with a first end and a second end wherein the first end has a flat surface that defines a base while the second end has a U-shape
Data Source
AI summary
A parking brake including a disc fixed to a vehicle and a plurality of clips attached to the disc to align channels on first and second brake shoes with a braking surface on a drum. Each clip has a rectangular shape with a flat first end fixed to the disc and a U-shaped second end defined by parallel first and second sides separated by a spacer. A projection on the first end is mated with the disc to align the second end along a radial plane of the axis of the drum. The sides of the second end resiliently engage the channels and align friction surfaces on the first and second brake shoes with the braking surface. In addition, the clips attenuate any vibration that may occur between first and second brake shoes and the drum during movement of the vehicle to reducing the creation of noise in the brake.