Brake Pad Sensor Unit Mounting for Wear and Temperature Monitoring
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Solution Overview
Problem
Existing brake assemblies lack effective integration of sensor units with brake pad assemblies, leading to inadequate wear and temperature monitoring, and potential movement issues during braking, which can result in reduced braking performance and increased maintenance costs.
Innovation Solution
A brake assembly design that incorporates a sensor unit straddling the backplate and pad spring, with encapsulated sensors for wear and temperature monitoring, and a coil member for durability and thermal management, allowing for secure mounting and improved retention without requiring a slot in the backplate, and utilizing a connecting member for electrical connectivity between sensor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor unit is mounted to a backplate of a brake pad assembly, then wear and temperature monitoring capability is improved, but the sensor unit may move during braking operations
Solution Approach 1:
The sensor unit is segmented into multiple components: a front body that engages the front side of the backplate, a rear body that engages the rear side of the backplate, and a bridge that connects them. This segmentation allows each component to be independently positioned and secured, preventing movement during braking while maintaining monitoring functionality.
Solution Approach 2:
The sensor unit merges multiple functions into a single integrated structure: mechanical mounting (front body and rear body engaging opposite sides of the backplate), structural support (bridge connecting the bodies), and sensing (encapsulated sensors for wear and temperature monitoring). This merging ensures the sensor unit remains stable while performing multiple monitoring functions.
2Reliability
If a sensor unit straddles the backplate and extends to the pad spring, then secure mounting and retention are improved, but the device complexity increases
Solution Approach 1:
The bridge component serves multiple functions simultaneously: it structurally connects the front body and rear body, provides mounting support for the encapsulated sensors, and engages with the pad spring to secure the sensor unit's position. This multi-functionality reduces the need for additional separate components, thereby managing complexity while improving retention.
Solution Approach 2:
The sensors are encapsulated within the sensor unit structure, with the first sensor encapsulated in the front body and the second sensor encapsulated in the rear body. This nesting approach integrates the sensing elements directly into the mounting structure, eliminating the need for separate sensor housings and reducing overall device complexity.
3Measurement precision
If the front body extends further from the pad spring than the rear body, then wear monitoring precision is improved, but the device becomes less symmetrical and harder to manufacture
Solution Approach 1:
The front body is designed with asymmetric extension, protruding further from the pad spring than the rear body. This local quality change positions the first sensor (encapsulated in the front body) closer to the friction material wear interface, improving wear monitoring precision at the critical location without requiring complete asymmetry throughout the entire device.
Solution Approach 2:
The sensor unit employs asymmetric design where the front body extends further than the rear body. This asymmetry is deliberately implemented to optimize the positioning of the wear monitoring sensor near the friction material, accepting the manufacturing complexity as a trade-off for superior measurement precision at the critical wear interface.
4Temperature
If a coil member is received inside the sensor unit and sleeve, then thermal management and protection are improved, but the device complexity and volume increase
Solution Approach 1:
The coil member is received inside the sensor unit and further enclosed by the sleeve, creating a nested arrangement. This nesting efficiently packages the thermal management component within the existing sensor unit volume, minimizing the overall volume increase while providing thermal protection and management functionality.
Solution Approach 2:
The sleeve acts as a flexible protective shell that encircles the coil member and electrical conductors. This thin-walled structure provides thermal management and mechanical protection with minimal volume addition, allowing the coil member to be integrated into the sensor unit without significantly increasing overall size.
Data Source
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AI summary
A brake assembly (10) that includes a brake pad assembly (24), a pad spring (28), and a sensor unit (30). The brake pad assembly (24) includes friction material disposed on a backplate (80). The pad spring (28) is mounted to the backplate (80). The sensor unit (30) straddles the backplate (80) and extends from the backplate (80) to the pad spring (28).