Disc Brake Pad Support Geometry for Vibration and Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing disc brakes experience vibrations and noise due to the switching between static and dynamic friction during braking, which is caused by the lack of relative speed between the brake disc and the pads.
Innovation Solution
The disc brake design incorporates a support bracket with inclined support surfaces that generate a relative speed between the brake disc and the pads, stabilizing the friction pads and reducing vibrations by ensuring a consistent dynamic friction condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the support bracket uses a parallel support surface perpendicular to the braking torque direction, then the structure is simple, but vibrations and noise occur due to switching between static and dynamic friction
Solution Approach 1:
The support surface is inclined at an angle of 5 to 15 degrees relative to the normal plane perpendicular to the braking torque direction. This parameter change creates a relative speed between the pad and disc, maintaining dynamic friction condition and preventing the harmful switching between static and dynamic friction that causes vibrations and noise.
2Object-affected harmful factors
If the support bracket uses an inclined support surface to generate relative speed, then vibrations and noise are reduced, but the manufacturing complexity increases
Solution Approach 1:
The inclination angle is optimized within a specific range of 5 to 15 degrees. This controlled parameter change achieves the beneficial effect of maintaining dynamic friction and reducing vibrations, while limiting the angle increase to a manageable range that does not excessively complicate manufacturing processes.
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 solution effectively reduces vibrations and noise by maintaining a consistent dynamic friction condition, enhancing the braking performance and stability of the disc brake.
Implementation Method 1
friction pads disposed on both sides of the brake disc and supported by a caliper movably in a direction of the rotation axis... when the caliper presses the pair of friction pads against the brake disc to generate a braking torque... a first support surface configured to surface contact with a first contact surface of the rotational direction end of the back plate, the first support surface extending along a first plane inclined at a first angle θ1 relative to a normal plane perpendicular to a direction in which the braking torque acts on the pads such that a relative speed is generated between sliding direction of the brake disc and sliding direction of the pads
Data Source
AI summary
A disc brake comprises a pair of friction pads disposed on both sides of a brake disc and supported by a caliper movably in a direction of the rotation axis, each of the friction pads comprising a back plate having a rotational direction end which is an end thereof in a rotational direction of the brake disc. The caliper comprises a support bracket extending in the direction of the rotation axis. The support bracket includes a first support surface configured to surface contact with a first contact surface of the rotational direction end of the back plate, the first support surface extending along a first plane inclined at a first angle θ1 relative to a normal plane perpendicular to a direction in which the braking torque acts on the pads such that a relative speed is generated between sliding direction of the brake disc and sliding direction of the pads.