Disc Brake Pad Spring Layout for Forward-Braking 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 addressed by previous solutions that only focus on preventing crunch sound by aligning braking moments during forward and reverse braking.
Innovation Solution
A disc brake pad spring is designed to elastically press the pads against the pad support member, featuring a metal plate configuration with specific pressing parts that prevent the pads from moving towards the pin during forward braking, thereby avoiding collisions and stabilizing the pads' posture in both braking and non-braking states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pad spring presses the pad towards the pin during forward braking, then the pad stability is improved, but the abnormal noise due to collision between through hole and pin occurs
Solution Approach 1:
The pad spring is designed to press the pad against the pin in advance during forward braking, preventing the pad from moving and colliding with the through hole. This preliminary pressing action eliminates the abnormal noise before it can occur.
Solution Approach 2:
The pad spring applies a counteracting force to prevent the pad from moving towards the through hole during forward braking. By pressing the pad against the pin in advance, it counteracts the potential collision and abnormal noise generation.
2Device complexity
If the pad spring structure is simplified to a single metal plate, then the device complexity is reduced, but the ability to prevent both crunch sound and abnormal noise simultaneously is compromised
Solution Approach 1:
The single metal plate pad spring is segmented into multiple functional pressing parts: a first pressing part that prevents crunch sound by pressing the pad against the pin during reverse braking, and a second pressing part that prevents abnormal noise by pressing the pad against the pin during forward braking. This segmentation allows the simple structure to perform multiple noise prevention functions.
Solution Approach 2:
The single metal plate pad spring is designed with multiple pressing parts that perform different functions: preventing crunch sound during reverse braking and preventing abnormal noise during forward braking. This multi-functionality allows a simple structure to address multiple noise issues simultaneously.
3Ease of operation
If the pad is allowed to move freely during forward braking, then the ease of operation is improved, but the collision between through hole and pin generates abnormal noise
Solution Approach 1:
The pad spring acts as an intermediary between the pad and the pin during forward braking. It applies a pressing force that prevents the pad from moving freely and colliding with the through hole, thereby eliminating abnormal noise while maintaining controlled movement.
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 non-braking states and abnormal noise during forward braking by ensuring the pads do not collide with the pins, maintaining pad stability and reducing the risk of judder.
Implementation Method 1
a disc brake pad spring configured to be attached to a disc brake device (1a) in which a pair of pads (inner pad 3a and outer pad 4a) located to sandwich a rotor (5) are supported with respect to a pad support member (caliper 2a)
Data Source
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AI summary
A pad spring (23), provided with a pair of first pressing parts (39a, 39b) and a pair of second pressing parts (42a, 42b), is attached to a disc brake device (1a). The pair of first pressing parts (39a, 39b) elastically press peripheral-direction one-side parts of the outer peripheral edges of respective back plates (15a) constituting an inner pad (3a) and an outer pad (4a), the one-side parts being pressed diametrally inward. The pair of second pressing parts (42a, 42b) elastically press peripheral-direction one-side surfaces of the respective back plates (15a) constituting the inner pad (3a) and the outer pad (4a), the one-side surfaces being pressed toward the other peripheral side.