Drum Brake Wear Sensor Assembly Using Plunger Position Feedback
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Solution Overview
Problem
Existing drum brake assemblies lack an effective method for continuously monitoring the wear of friction material in brake pad assemblies, which can lead to inadequate braking performance and increased maintenance costs.
Innovation Solution
A drum brake assembly incorporating a wear sensor device with a sleeve, plunger, and sensor, where the plunger is coupled to the first brake pad assembly and the sleeve is coupled to the second brake pad assembly, allowing the sensor to provide a signal indicative of the plunger's position relative to the sleeve, thereby monitoring the wear of the friction material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection methods are used to monitor brake pad wear, then device complexity is reduced, but measurement precision and reliability of wear monitoring deteriorate
Solution Approach 1:
The patent replaces manual mechanical inspection with an electronic sensor system that automatically measures brake pad wear. The sensor device includes a sensor, plunger, and sleeve assembly that electronically detects wear thickness without requiring manual measurement tools or operator intervention, thereby improving measurement precision while accepting increased device complexity.
Solution Approach 2:
The wear sensor device performs self-monitoring of brake pad wear conditions. The sensor system automatically detects wear thickness and can trigger alerts or signals when wear thresholds are reached, eliminating the need for external manual inspection and enabling the braking system to monitor its own condition continuously.
2Reliability
If no wear monitoring system is installed, then device complexity remains low, but reliability of braking performance deteriorates
Solution Approach 1:
The wear sensor device provides continuous feedback on brake pad wear conditions to the vehicle operator or monitoring system. The sensor detects plunger position changes caused by wear thickness variations and generates signals that inform maintenance needs, enabling proactive brake pad replacement before performance degradation occurs, thereby improving braking reliability.
Solution Approach 2:
The sensor device detects wear conditions before they reach critical levels that would compromise braking performance. By providing advance warning of wear thresholds, the system enables preliminary maintenance action to be taken, preventing reliability failures rather than responding after problems occur.
3Measurement precision
If manual inspection frequency is increased, then measurement precision improves, but loss of time and productivity deteriorate
Solution Approach 1:
The wear sensor device provides continuous monitoring of brake pad wear conditions during normal vehicle operation, eliminating the need for periodic manual inspections. The sensor continuously measures wear thickness and tracks changes over time, providing ongoing precision measurement without removing the vehicle from service or requiring scheduled downtime for inspection.
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
The wear sensor device enables continuous, electronic monitoring of brake pad wear, providing timely alerts to vehicle operators and reducing the need for manual inspections, thus enhancing safety and reducing maintenance costs.
Implementation Method 1
The sensor may comprise a linear variable differential transformer
Data Source
AI summary
A drum brake assembly comprising first and second brake pad assemblies and a wear sensor device. The wear sensor device comprises a sleeve, a plunger, and a sensor. The sleeve is coupled to the first brake pad assembly. The plunger is coupled to the second brake pad assembly. The sensor provides a signal indicative of a position of the plunger with respect to the sleeve.