Disc Brake Pad Spring Structure for Reverse Brake Squeal
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Solution Overview
Problem
Existing disk brake systems experience brake squeal when mildly braked while moving backward due to low abutment load between the friction pad and torque reception surface, causing friction pad vibration.
Innovation Solution
A disk brake design featuring a friction pad with ear portions and a spring member that includes an attachment portion, an extension portion, and an abutment portion to bias the friction pad toward the disk rotationally exiting side, with the abutment portion receiving a reaction force from the torque reception surface to reduce vibration and squeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the friction pad is pressed against the disk with hydraulic pressure during backward braking, then braking force is generated, but the low abutment load causes the friction pad to vibrate and generate brake squeal
Solution Approach 1:
The biasing portion is configured to pre-press the friction pad against the torque reception surface before braking occurs. This preliminary action ensures that the friction pad maintains sufficient abutment load even during mild backward braking, preventing vibration and brake squeal while still allowing effective braking force generation when needed
2Force
If the friction pad is designed with ear portions to transmit torque, then torque transmission is improved, but the friction pad becomes prone to vibration when abutment load is low
Solution Approach 1:
The biasing portion acts as a counterbalancing element that provides continuous pre-pressing force to the ear portion of the friction pad. This counteracting force ensures that the ear portion maintains stable contact with the torque reception surface, preventing vibration and instability while still allowing effective torque transmission during braking operations
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 prevents or reduces brake squeal during backward braking by stabilizing the friction pad and reducing self-induced vibrations through the spring member's reaction force management.
Implementation Method 1
a spring member (a biasing portion) attached to this friction pad and configured to press this friction pad in a disk circumferential direction. This spring member pre-presses the friction pad to a disk rotationally exiting side when the vehicle moves forward
Implementation Method 2
The abutment portion is configured to receive a reaction force from the torque reception surface by abutting against the torque reception surface at a position on an opposite side of the ear portion from the disk
Data Source
AI summary
A friction pad mounted on a disk brake includes a back plate, and a lining attached to the back plate and configured to frictionally contact a disk. A spring member, configured to bias the friction pad toward a disk rotationally exiting side, is provided to an ear portion of the back plate. The spring member includes an attachment portion attached to the back plate, an extension portion extending from an end portion of the attachment portion, and an abutment portion folded back from the extension portion and extending in a direction toward the disk. The abutment portion is configured to receive a reaction force from a torque reception surface by abutting against the torque reception surface at a position on an opposite side of the ear portion from the disk when the ear portion and the torque reception surface of a mount member abut against each other.