Disk Brake Pad Spring Guide Plate Configuration
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Solution Overview
Problem
Conventional disk brakes face issues with inconsistent urging force for friction pads due to the design of pad-urging spring members, leading to rattling and vibration, which affects braking performance and noise generation.
Innovation Solution
The design incorporates guide plate portions, radially urging portions, and circumferentially urging portions in the pad springs, allowing for constant urging force and stable pad alignment, with claw portions and projections to manage stress and prevent deformation, ensuring independent deformation of radially and circumferentially urging portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pad-urging spring members are formed as elongated plate-shaped spring members extending obliqu to the axial direction of the disk, then the friction pads can be urged in the rotational direction, but the urging force differs considerably when friction pads are new versus worn, making it difficult to keep the urging force constant
Solution Approach 1:
The patent changes the geometric parameters of the pad-urging spring members by making them extend substantially parallel to the axial direction of the disk instead of obliquely. This parameter change ensures that the urging force remains constant regardless of whether the friction pads are new or worn, as the spring members no longer experience varying leverage angles during pad wear.
2Ease of manufacture
If pad-urging spring members have substantially U-shaped folded portions at the proximal end, then the spring members can be formed by folding elongated plate-shaped spring members, but the folded portions extend axially outward to a considerable extent, interfering with assembling operations
Solution Approach 1:
The patent repositions the folded portions of the pad-urging spring members from extending axially outward to extending radially outward from the axial direction of the disk. This dimensional change in the orientation of the folded portions eliminates interference with assembling operations while maintaining the ease of manufacture through folding.
3Force
If pad-urging spring members extend obliquely to the axial direction of the disk, then the spring members can urge friction pads in the rotational direction, but the urging direction is tilted at an angle to the plane of the disk, causing friction pads to tilt with respect to the disk
Solution Approach 1:
The patent changes the orientation parameter of the pad-urging spring members from oblique extension to extending substantially parallel to the axial direction of the disk. This parameter change ensures that the urging force is applied in a direction parallel to the plane of the disk, preventing the friction pads from tilting and maintaining proper pad alignment.
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 stabilizes the friction pads' attitude, maintains consistent urging force, suppresses rattling and vibration, and prevents brake noise, enhancing the durability and reliability of the disk brake system.
Implementation Method 1
The pad spring further has circumferentially urging portions formed as wide plate-shaped members bent from the guide plate portions obliquely radially inward of the disk to urge the friction pads in the rotational direction of the disk
Implementation Method 2
The pad spring has radially urging portions extending axially of the disk between the guide plate portions and the friction pads to urge the friction pads radially outward of the disk
Data Source
AI summary
A pad spring located at the entrance side in the rotational direction of a disk is provided with guide plate portions, radially urging portions that urge a pair of friction pads radially outward of the disk, and circumferentially urging portions that urge the friction pads in the rotational direction of the disk. Each radially urging portion has a projection bent radially inward of the disk. Each guide plate portion has a space portion that allows the projection to abut against the radially inner wall surface of the associated pad guide when the radially urging portion is displaced radially inward of the disk so as to approach the guide plate portion. The circumferentially urging portions are wide plate-shaped members bent from the guide plate portions.