Vehicle Disk Brake Pad Retainer Elastic Loop Design
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Solution Overview
Problem
Conventional disk brake pad retainers bias friction pads toward the disk turn-out side, causing them to be dragged and leading to clunking noise during vehicle travel and braking.
Innovation Solution
A disk brake design featuring U-shaped pad guide grooves with a pad retainer that includes a pad rebounding section with an elastic loop, biasing lug pieces outward during travel and allowing them to return inward during braking, preventing dragging and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pad retainer biases the friction pad toward the disk turn-out side, then the rattling of the friction pad is suppressed, but the friction pad is dragged and does not easily return to the initial position
Solution Approach 1:
The pad retainer structure transitions from a static biasing mechanism to a dynamic one where the elastic loop section can deform and rebound. The pad rebounding section with its elastic loop allows the retainer to dynamically adjust its biasing force, enabling the friction pad to be pressed during braking while freely returning during travel, thus eliminating both rattling and dragging noises.
Solution Approach 2:
The elastic properties of the pad retainer are optimized by controlling the thickness and material properties of the elastic loop section. By adjusting these parameters, the retainer provides sufficient biasing force to suppress rattling during braking while maintaining enough elasticity to allow free return during travel, preventing dragging and clunking noise.
2Reliability
If the pad retainer always presses the friction pad against the disk turn-out side, then abnormal sounds are prevented, but the friction pad cannot return to its initial position easily
Solution Approach 1:
The pad retainer operates in a periodic manner, providing biasing force during braking operations while becoming inactive during travel. The elastic loop section stores and releases energy in a cyclic fashion, allowing the friction pad to be pressed against the disk during braking to prevent abnormal sounds, then returning freely during travel between braking events.
3Object-affected harmful factors
If the lug piece is biased outward during travel, then rattling is suppressed, but the inside section and pad rebounding section must be precisely positioned to prevent contact during normal operation
Solution Approach 1:
The pad retainer design creates a balanced force system where the elastic loop section's natural curvature and the pad rebounding section's inclination work together to maintain an optimal gap. This equipotential design ensures that the lug piece is biased outward to suppress rattling while the geometric relationships between components naturally maintain the required clearance without requiring extreme manufacturing precision.
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
The design effectively suppresses rattling and clunking noise by biasing lug pieces outward during travel and allowing them to return to their initial position during braking, preventing friction pad dragging and noise generation.
Implementation Method 1
the elastic loop section extending from an end of the inside section away from the disk rotor, toward the outside in the radial direction of the disk rotor... the pad rebounding section comes into contact with the inside section... the back section is elastically deformed
Data Source
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AI summary
A disk brake for a vehicle such that the dragging of a friction pad is prevented while also suppressing the rattling of the friction pad and preventing the occurrence of a clunking noise, wherein a retainer part (10a) of a pad retainer (10) is provided with an outside section (10g), a back section (10h), and an inside section (10f). A pad rebounding section (10c) is formed by inclining the leading end of a strip, which extends in the disk rotor direction from the end of the inside section (10f) away from the disk rotor with an elastic loop section (10b) therebetween, toward the outside in the radial direction of the disk. During travel, a gap (E1) is formed between the inside section (10f) and the strip of the pad rebounding section (0c), and when a lug piece (6b) moves inward in the radial direction of the disk, the pad rebounding section (10c) and the inside section (10f) come into contact with each other, the inside section (10f) is pressed against an inside surface (3f) in the radial direction of the disk, the back section (10h) is elastically deformed so as to warp toward the lug piece, and the elastically deformed back section (10h) presses the lug piece (6b) toward the center side of a caliper body (5).