Disc Brake Pad Spring Structure for Slight-Pressure Squeal
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Solution Overview
Problem
Disc brakes experience a slight-pressure squeal during slight-pressure braking due to the friction pad being supported by a relatively weak spring, leading to vibrations and inadequate contact rigidity.
Innovation Solution
The disc brake design includes a pad guide part with a recessed shape and a pad spring with a fitting part that protrudes to elastically fit into the recessed part, enhancing contact rigidity and suppressing vibrations by restricting movement and applying an elastic force to the side surfaces of the recessed part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the friction pad is supported by a pad spring with simple structure, then the device complexity is reduced, but the contact rigidity is insufficient causing slight-pressure squeal
Solution Approach 1:
The pad spring is divided into multiple functional parts: a guide part that provides vertical guidance, a fitting part that engages with the recessed part, and a spring part that provides elastic force. This segmentation allows each part to perform its specific function optimally, improving contact rigidity while maintaining structural clarity
Solution Approach 2:
The fitting part of the pad spring is nested within the recessed part of the pad guide part. This nested configuration restricts horizontal movement of the friction pad while allowing vertical movement, thereby enhancing contact rigidity without significantly increasing overall device complexity
2Ease of operation
If the pad spring allows free movement of the friction pad, then the ease of operation is improved, but vibrations occur causing slight-pressure squeal
Solution Approach 1:
The pad guide part has different structural characteristics at different locations: the recessed part at the bottom provides lateral constraint to reduce vibrations, while the upper portion allows free vertical movement for ease of operation. This local differentiation of structural properties resolves the contradiction between movability and vibration suppression
Solution Approach 2:
The guide part of the pad spring acts as an intermediary between the friction pad and the pad guide part. It transmits vertical movement while the fitting part mediates lateral constraints through engagement with the recessed part, thereby reducing vibrations without restricting necessary operational 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
This configuration effectively suppresses the slight-pressure squeal by increasing contact rigidity and preventing the pad spring from rising, thereby reducing vibrations and maintaining stable friction pad support during braking.
Implementation Method 1
a pad spring attached to the attachment member and elastically supporting each of the friction pads
Implementation Method 2
a fitting part protruding in the disc rotation direction from the guide part and configured to elastically fit into the recessed part
Data Source
AI summary
This disc brake includes an attachment member having a pad guide part, a pair of friction pads, a caliper, and a pad spring. The pad guide part includes a recessed part, which is recessed in a disc rotation direction with respect to a bottom surface in a region on a disc radial direction outer side, in a region of a bottom part of the pad guide part on a disc radial direction inner side. The pad spring includes a guide part provided to be able to come into contact with a wall surface and the bottom surface of the pad guide part on the disc radial direction outer side and configured to guide movement of a protruding part in a disc axial direction, and a fitting part protruding in the disc rotation direction from the guide part and configured to elastically fit into the recessed part.