Brake Pad Slot Geometry for Squeal-Resistant Pin Support
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Solution Overview
Problem
Existing brake pads tend to generate squeaking noises during braking due to radial reaction forces and varying resting configurations, which complicates the implementation of effective countermeasures to minimize vibration-induced noise.
Innovation Solution
The brake pad design features a tangentially aligned first slot to accommodate a pin, ensuring that the braking force is centered and aligned with the pad's center of gravity, thereby minimizing radial reaction forces and vibrations. Additionally, an elastic support element is used to maintain consistent contact points and prevent pad rotation during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pin is positioned to transmit braking force effectively, then braking performance is improved, but radial reaction forces increase causing squeaking noises
Solution Approach 1:
The pin is positioned asymmetrically relative to the pad's center of gravity, specifically offset in the tangential direction. This asymmetric positioning allows the pin to effectively transmit braking forces while creating a moment that counteracts radial reaction forces, thereby reducing squeaking noises without compromising braking performance
Solution Approach 2:
The invention changes the positional parameters of the pin relative to the pad structure. By specifically positioning the pin at a predetermined offset distance from the center of gravity in the tangential direction, the force distribution is optimized to minimize radial reactions while maintaining effective braking force transmission
2Ease of operation
If the pad is allowed to slide freely on the pin, then ease of operation is improved, but multiple resting configurations cause inconsistent contact points and knocking phenomena
Solution Approach 1:
The clearance between the pin and eyelet is optimized to a specific range, allowing sufficient pad sliding for ease of operation while being small enough to limit the pad to a single stable resting configuration, ensuring consistent contact points and eliminating knocking phenomena
Solution Approach 2:
The elastic support element provides continuous feedback force to the pad, maintaining consistent contact with the pin throughout operation. This elastic feedback ensures the pad returns to the same resting position after each braking cycle, guaranteeing repeatable contact points
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 design significantly reduces the occurrence of squeaking noises by minimizing radial reaction forces and ensuring consistent contact points, leading to quieter and more reliable braking performance.
Implementation Method 1
an elastic support element is used to maintain consistent contact points and prevent pad rotation during braking
Data Source
AI summary
A brake pad may have at least one plate. The plate may be provided with a first slot. The first slot may have a first slot edge adapted to accommodate a first pin. The first slot edge may have a first portion and a second portion, in which the brake pad has a tangential center-of-gravity plane. The first and second portions may be crossed by the tangential center-of-gravity plane so that under a reverse braking condition the brake pad rests against the first pin in at least a first contact point of the first slot. Under a forward braking condition the brake pad rests against the first pin in at least a second contact point of the first slot in which the second contact point of first slot lies in the tangential center-of-gravity plane.