Hollow Retaining Bolt with Embedded Magnet for Brake Force Measurement
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Solution Overview
Problem
Existing brake fastening systems lack an efficient method to accurately measure the braking force applied to brake components, particularly in disc brakes, where deformation-based measurements are indirect and not sensitive enough to varying loads.
Innovation Solution
A retaining bolt with a cavity housing a movable holder and a magnetic sensor system, where the holder's movement due to deformation is measured using a permanent magnet and magnetic sensor, allowing for precise determination of the load applied to the bolt, which corresponds to the braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deformation-based measurement methods are used in existing brake fastening systems, then the measurement can be implemented, but the measurement precision is not sufficient to accurately detect varying braking loads
Solution Approach 1:
The patent replaces indirect deformation-based measurement with a direct magnetic field sensing system. A permanent magnet is embedded in the retaining bolt, and a magnetic sensor (such as a Hall effect sensor or magnetoresistive sensor) directly measures the magnetic field changes caused by bolt deformation. This substitution of mechanical measurement with magnetic field measurement significantly improves measurement precision and sensitivity to varying braking loads.
Solution Approach 2:
The patent embeds the permanent magnet within the retaining bolt structure itself, nesting the sensing element inside the component being measured. This integration allows the magnetic field to directly reflect the deformation state of the retaining bolt, enabling precise measurement of braking forces while maintaining structural integrity.
2Measurement precision
If a magnetic sensing system is integrated into the retaining bolt, then measurement precision improves, but the device complexity increases
Solution Approach 1:
The retaining bolt is designed to serve multiple functions: it acts as both the fastening element and the sensing element. The permanent magnet embedded in the bolt enables magnetic field sensing, while the bolt itself provides the mechanical fastening function. This multi-functionality reduces overall system complexity by eliminating separate sensing components.
Solution Approach 2:
The patent merges the structural function of the retaining bolt with the sensing function by embedding the permanent magnet within the bolt. This combination integrates the measurement capability into the existing component, avoiding the need for separate sensing devices and reducing system complexity.
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 accurate measurement of braking forces by detecting changes in the magnetic field caused by the holder's movement within the retaining bolt, providing adaptable sensitivity to different loads and protecting the measuring device within the bolt's cavity.
Implementation Method 1
A permanent magnet is arranged on the holder and forms a magnetic field which can be detected by a magnetic sensor
Implementation Method 2
the holder moves at a distance from the fastening point or between the fastening points in relation to the retaining bolt when the retaining bolt is deformed by a mechanical load (elastic)
Data Source
Figure 1~2
AI summary
The invention relates to a retaining bolt (6) for attaching a brake caliper (2) to a support (7). Said retaining bolt (6) is hollow and comprises a retaining element (11) which is fixed on one side in a cavity (10) of the retaining bolt (6), supporting a permanent magnet (16) on a free end. When the retaining bolt (6) is moved due to an external load, the permanent magnet (16) moves in the cavity (10) of the retaining bolt (6) and the modification of the magnetic field thus produced can be measured by a magnetic sensor (14). Said retaining bolt (6) allows the braking power of the disk brake (1) to be measured.