Brake Pad Wear Sensor Head Layout for Sequential Cable Contact

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Solution Overview

Problem

Existing wear indication devices for disk brakes are prone to damage and fail to accurately detect brake pad wear due to the susceptibility of sensor heads and improper cable routing, leading to incorrect signal generation and potential safety issues.

Innovation Solution

A double channel configuration within the sensor head that receives two signal cables, with sections positioned radially adjacent to each other and separated by protrusions, ensures that only one cable comes into contact with the brake disc at the wear limit, preventing simultaneous damage and ensuring accurate signal emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If two cable sections are arranged parallel to the axial axis in separate channels, then cable separation is achieved, but both cable sections come into contact with the brake disc simultaneously leading to final correction

Engineering Contradiction:

Improvecable position stabilityVSAvoidcable contact with brake disc

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent transitions from arranging cable sections in separate radial channels to positioning them one above the other in the axial dimension. This vertical stacking within a single channel ensures that when the brake pad wears, only the upper cable section contacts the brake disc first, while the lower section remains protected until the upper section is fully worn away.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent pre-positions the cable sections vertically stacked within the sensor head channel, with the upper section intentionally placed closer to the brake disc contact path. This preliminary arrangement ensures controlled sequential contact during wear, preventing simultaneous contact and the resulting diagnostic errors.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If sensor head is made robust and damage-resistant, then reliability improves, but device complexity increases

Engineering Contradiction:

Improvesensor head durabilityVSAvoidsensor head structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the cable routing function into the sensor head body by forming an integrated channel within the sensor head. This single-piece construction eliminates separate cable guides and reduces the number of components, making the sensor head more robust while actually simplifying the overall structure.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sensor head channel is designed with smooth internal surfaces and appropriate cross-sectional geometry to guide the cable sections through the entire wear process. The channel structure protects the cables from lateral displacement and damage while maintaining a simple, damage-resistant sensor head design.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentEP3982000B1Device for recognizing wear of a brake pad of a disk brake

Publication Date: 2025.01.01 ZF CV SYST EURO BV

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AI summary

A wear indication device (10) for a vehicle brake (1), preferably a disc brake of a commercial vehicle, for indicating a wear condition of a brake pad (20) comprising: a fixing section (12) for fixing the wear indication device (10) to a brake pad back plate (30), a sensor head (14) associated to the fixing section (12), and a channel (16) for receiving a signal cable (40) within the sensor head (14). According to the invention, the channel (16) is configured to receive two signal cables (40', 40").