Disc Brake Pad Spring Layout to Prevent Released-State Dragging
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Solution Overview
Problem
Disc brakes experience dragging issues due to friction pads coming into contact with the disc during the released state, which affects braking performance and efficiency.
Innovation Solution
A disc brake design incorporating an attachment member, caliper, pair of friction pads, return springs, and pad springs that bias the friction pads away from the disc, utilizing turning-in-side and turning-out-side return springs and pad springs to manage pad movement and prevent contact during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If friction pads are pressed against the disc by the caliper, then braking force is generated, but dragging occurs when the brake is in the released state
Solution Approach 1:
The return spring system is segmented into multiple components: turning-in-side return springs and turning-out-side return springs, with each having specific abutting surface portions. This segmentation allows different regions of the friction pad to be controlled by different spring forces, preventing dragging in the released state while maintaining braking force during operation
Solution Approach 2:
Different abutting surface portions are provided at different locations on the friction pad (turning-in-side abutting surface portion and turning-out-side abutting surface portion). Each surface portion interacts with corresponding return springs to provide localized force control, ensuring the friction pad maintains proper positioning without dragging during the released state
2Reliability
If the friction pad is biased away from the disc by the return spring, then dragging is prevented, but improper alignment may occur during rotation
Solution Approach 1:
The pad spring configuration is asymmetric: the turning-in-side pad spring has a larger biasing force than the turning-out-side pad spring. This asymmetric force distribution compensates for the rotational movement of the disc, maintaining proper alignment of the friction pad relative to the disc throughout the rotation cycle while preventing dragging
Solution Approach 2:
The pad springs are pre-configured with specific biasing forces to anticipate and compensate for rotational alignment issues before they occur. The turning-in-side pad spring applies a stronger preliminary force to ensure the friction pad maintains correct positioning as the disc rotates, preventing misalignment
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
Effectively prevents dragging of friction pads, enhancing braking performance and efficiency by ensuring proper alignment and movement of the pads relative to the disc, thus improving the overall braking process.
Implementation Method 1
The return spring includes a turning-in-side return spring and a turning-out-side return spring... The return spring biases the pair of friction pads in a direction away from the disc in the direction of the rotation axis
Implementation Method 2
The turning-in-side pad spring includes a turning-in-side side pushing spring that generates a first biasing force of biasing, on the turning-out side and in a direction of the disc in the direction of the rotation axis, a turning-in-side friction pad portion
Data Source
AI summary
A disc brake includes pad springs including a turning-in-side pad spring and a turning-out-side pad spring. The turning-in-side pad spring includes a turning-in-side side pushing spring that generates a first biasing force of biasing, on a turning-out side and in a direction away from the disc in a direction of a rotation axis of the disc, a turning-in-side friction pad portion of each of a pair of friction pads. The turning-out-side pad spring includes a turning-out-side side pushing spring, a second biasing force of which biasing, on a turning-in side and in the direction away from the disc in the direction of the rotation axis of the disc, a turning-out-side friction pad portion of each of the pair of friction pads is smaller than the first biasing force of the turning-in-side side pushing spring.