Brake Pad Carrier Segmentation for Low Torque Detection
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Solution Overview
Problem
Existing measuring devices for disc brakes are unable to detect small grinding torques below 5 Nm effectively due to the need to overcome preload forces and frictional coefficients, limiting their ability to record low-range torques.
Innovation Solution
A measuring device with a force transducer integrated within the brake pad carrier, capable of detecting forces between its parts, allowing for the measurement of low-range grinding torques without needing to overcome preload forces, using piezoelectric or capacitive force measuring transducers and a design that allows relative movement between carrier parts to prevent excessive stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measuring module is arranged in a brake pad and brake pad carrier to detect grinding torque, then the grinding torque can be detected, but the preload force of the hold-down spring (around 100 N) and friction between brake pad and carrier prevent detection of small grinding torques below 5 Nm
Solution Approach 1:
The brake pad carrier is divided into a first brake pad carrier part and a second brake pad carrier part, with the force measuring transducer arranged between them. This segmentation allows the measurement of interaction forces between the two parts, enabling detection of small grinding torques that would otherwise be masked by the overall preload force.
Solution Approach 2:
The force measuring transducer acts as an intermediary element between the first and second brake pad carrier parts. It specifically measures the interaction forces (grinding forces) between the carrier parts without being affected by the hold-down spring preload, thus enabling precise measurement of small grinding torques.
2Measurement precision
If the force measuring transducer is integrated within the brake pad carrier parts, then small grinding torques can be detected, but the transducer may be subjected to excessive stress during braking operations
Solution Approach 1:
The first and second brake pad carrier parts are designed to be movable relative to one another during braking operations. This dynamic design allows the carrier parts to move together as a unit when braking forces are applied, preventing excessive stress from being transmitted to the force measuring transducer while still enabling precise measurement of grinding forces 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
Enables the detection of extremely low grinding torques, including those below 5 Nm, by measuring compressive forces between carrier parts, thereby reducing wear and fuel consumption, and preventing damage to the force transducer through controlled force limits.
Implementation Method 1
using piezoelectric or capacitive force measuring transducers
Implementation Method 2
using piezoelectric or capacitive force measuring transducers
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a measuring device (1) for detecting a grinding torque between a brake disc and a brake pad (103) of a disc brake (100), comprising a pad carrier (3a, 3b) for supporting the brake pad (103) and a force sensor (5) for measuring a force resulting from the grinding torque and acting on the brake pad (103), wherein the pad carrier (3a, 3b) has a first pad carrier part (3a) and a second pad carrier part (3b), and the force sensor (5) is configured to detect the force acting between the first pad carrier part (3a) and the second pad carrier part (3b). The invention further relates to a brake disc (100) with such a measuring device (1) and a method for detecting a grinding torque between a brake disc and a brake pad (103) of a disc brake (100).