Brake Pad Wear Sensor Retainer for Easy Caliper Service
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Solution Overview
Problem
The conventional brake pad assembly configuration makes it difficult to easily attach or detach the detection unit for wear indication from the back plate, requiring complex operations to prevent dust ingress and facilitate caliper removal.
Innovation Solution
A brake pad assembly with a retainer system that includes a base portion, holding portions, an urging portion, and an operating portion, allowing the detection unit to be easily attached or detached from the back plate by moving the holding portion between restricting and release positions, with an elastically deformable movable arm to manage stress and prevent excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the detection unit is removed from the brake pad assembly, then the caliper can be removed from the vehicle, but the operation becomes complex and time-consuming due to connector removal requirements
Solution Approach 1:
The detection unit is segmented from the brake pad assembly, allowing it to be independently attached to or removed from the back plate. This segmentation enables the detection unit to be detached without removing the entire brake pad or caliper, simplifying maintenance operations while reducing operational complexity
Solution Approach 2:
The detection unit is extracted as a separate removable component from the brake pad assembly. By taking out the detection unit independently, the system allows for easy attachment and detachment without requiring removal of connectors or other brake components, thereby improving ease of operation without increasing device complexity
2Object-affected harmful factors
If the connector is removed to prevent dust ingress, then dust protection is improved, but the operation time increases significantly
Solution Approach 1:
The detection unit is designed with preliminary protective features that prevent dust ingress without requiring connector removal. The unit can be detached while connectors remain in place, and dust protection is maintained through the design of the attachment interface, thereby preventing dust harm while minimizing operation time
3Ease of manufacture
If the movable arm is made shorter to reduce material, then manufacturing cost decreases, but local stress increases during elastic deformation
Solution Approach 1:
The movable arm is designed with varying cross-sectional properties along its length, with thicker sections at high-stress areas and thinner sections where stress is lower. This local quality variation allows the arm to be shorter overall while maintaining sufficient strength, optimizing both material usage and stress distribution during elastic deformation
4Stress or pressure
If the movable arm is made longer to reduce stress, then stress distribution improves, but the arm may undergo excessive movement
Solution Approach 1:
The movable arm is equipped with stoppers that provide preliminary anti-action against excessive movement. These stoppers engage before the arm can undergo uncontrolled displacement, preventing instability while allowing the arm to be sufficiently long for optimal stress distribution during normal operation
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 simplifies the attachment and detachment of the detection unit, reducing operational complexity and stress on the movable arm, while ensuring reliable attachment and detachment without displacing components, thus enhancing the ease of maintenance.
Implementation Method 1
an urging portion for elastically urging the second holding portion from the release position toward the restricting position
Data Source
AI summary
This brake pad assembly is, for example, equipped with: a brake pad that includes a lining and a back plate; a detection unit attached to the plate and detects abrasion of the lining; and a retainer for attaching the unit to the plate in a detachable manner. The retainer has: a base part that contacts a surface of the plate; a first holding part that holds the retainer in a prescribed position on the plate; a second holding part provided so as to be movable between a restricting position in which the unit is restricted from separating from the plate, and a release position in which the unit can be detached from the plate; a biasing part that elastically biases the second holding part toward the restricting position; and an operation part that moves the second holding part to the release position by means of an applied external force.