Disc Brake Pad Spring Layout for Pin Collision Noise Prevention
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Solution Overview
Problem
The existing disc brake device generates abnormal noise due to collisions between the through hole of the pad's back plate and the pin during forward braking, which is not adequately addressed by previous solutions.
Innovation Solution
A disc brake pad spring is designed to elastically press the pads, featuring first and second pressing parts that adjust the position of the pads to prevent collisions, ensuring the through holes and pins do not collide during braking, thereby stabilizing the pads' posture and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pins are inserted into through holes to support pads to be movable, then pad movability is improved, but collision between through holes and pins during forward braking generates abnormal noise
Solution Approach 1:
The pad spring applies a preliminary pressing force to press the pad against the pin, creating preliminary contact that prevents the through hole from colliding with the pin during forward braking. This preliminary anti-action counteracts the harmful collision before it occurs.
Solution Approach 2:
The pad spring is pre-installed and pre-compressed to maintain continuous contact between the pad and pin. This preliminary action ensures the pad remains positioned correctly before braking occurs, preventing abnormal noise during forward braking.
2Power
If pads are pressed against rotor during braking, then braking function is improved, but collision between pads and pad support member generates crunch sound
Solution Approach 1:
The pad spring applies a preliminary pressing force in the opposite direction to the braking force, creating a counterbalancing effect that prevents the pad from colliding with the pad support member during braking, thereby eliminating crunch sound.
Solution Approach 2:
The pad spring acts as a cushioning element that is pre-compressed to absorb and dampen the impact forces between the pad and pad support member during braking, preventing the generation of crunch sound.
3Stability of the object's composition
If pad spring presses pad toward radially inner side, then pad stability is improved, but additional pressing force may cause wear
Solution Approach 1:
The pad spring is designed with specific elastic properties and pressing force parameters that optimize the balance between maintaining pad stability and minimizing wear. The elastic modulus, spring constant, and pre-compression amount are carefully selected to achieve the desired effect.
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 prevents brake noise in both non-braking and braking states by ensuring the pads are properly aligned, reducing the likelihood of collisions and maintaining pad stability during forward braking.
Implementation Method 1
a pad spring configured to elastically press the pair of pads
Data Source
AI summary
A disc brake pad spring being attached to a disc brake device in which pads located to sandwich a rotor are supported with a pad support member by inserting in an axial direction pins of the pad support member into a through hole formed in a radially inner side part of a peripheral-direction one-side part of a back plate of the pads, and elastically pressing pads against the pad support member. The disc brake pad spring is formed by a single metal plate, and includes first pressing parts pressing a peripheral-direction one-side part of an outer peripheral edge of the respective back plates of each of the pads toward a radially inner side, and second pressing parts pressing a peripheral-direction one-side surface of the respective back plates of each of pads toward the other peripheral side.