Radial Return Spring for Disk Brake Pad Stability
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Solution Overview
Problem
Conventional disk brakes face challenges in securing mounting space for return springs, leading to potential uneven wear and brake noise due to the orientation of return springs in the circumferential direction, which can cause friction pads to incline when releasing braking, resulting in run-out and noise issues.
Innovation Solution
The disk brake design incorporates a return spring with a first extended portion fixed to the friction pad's back plate and a second extended portion bent towards the mounting member, with the plate thickness direction oriented radially, allowing for stable friction pad return and reduced wear, and enabling more layout design options by utilizing a smaller mounting space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the return spring is oriented in the circumferential direction of the disk, then the mounting space is reduced, but the friction pads may incline when releasing braking causing uneven wear and run-out
Solution Approach 1:
The return spring is reoriented from the circumferential direction to the radial direction of the disk. This dimensional change allows the spring to extend along the radius rather than around the circumference, providing sufficient mounting space while maintaining proper friction pad alignment and preventing incline during braking release.
2Device complexity
If the return spring is oriented in the circumferential direction, then layout space is saved, but friction pad return stability deteriorates leading to brake noise
Solution Approach 1:
By changing the return spring orientation from circumferential to radial, the design simplifies the layout while simultaneously eliminating the brake noise problem. The radial orientation ensures the friction pads return smoothly without inclining, thereby preventing the generation of harmful noise during braking release.
3Area of stationary object
If the return spring is oriented in the circumferential direction, then mounting space is reduced, but uneven wear occurs on the friction pads
Solution Approach 1:
The return spring is reoriented from circumferential to radial direction, which provides adequate mounting space while ensuring uniform friction pad wear. The radial orientation allows the spring to exert force evenly on the friction pad, preventing the uneven wear that occurs with circumferential orientation.
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 ensures stable friction pad return, reduces uneven wear, prevents run-out and brake noise, and offers greater flexibility in layout design by efficiently utilizing the available mounting space.
Implementation Method 1
a return spring that is provided between the friction pad and the mounting member and urges the friction pad into a return direction separating from the disk
Implementation Method 2
the pad spring in which to elastically support the pair of friction pads with each of the arms is provided. This pad spring can inhibit that the friction pads are shook relative to the pad guide of the arms
Data Source
AI summary
There is provided a disk brake comprising: a mounting member axially extending over a disk periphery, the mounting member including a pad guide where a friction pad travels; a caliper; and a return spring between the friction pad and the mounting member and urges the friction pad into a return direction separating from the disk, wherein the return spring includes: a first extended portion where a base end side thereof is fixed to a back plate of the friction pad while a top end side thereof extends separating from the disk; and a second extended portion folded from the top end side of the first extended portion toward the mounting member, a top of the second extended portion extending to elastically abut to the side of the mounting member, and a plate thickness direction of the first extended portion extends to be approximately a radial direction of the disk.