Adapter Bushing for Sensor with Resilient Tongues and Fixed Points
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Solution Overview
Problem
Current clamping bushes for rod sensors in ABS brake systems face challenges in maintaining precise and uniform holding forces, leading to increased thermal and mechanical loads due to frictional heat, especially in commercial vehicles with disc brakes, which affects the accuracy and reliability of sensor operations.
Innovation Solution
The clamping bush design incorporates fixed points and lifting/guiding elements with a chamfer and insertion contour, allowing for precise force distribution and easier assembly, reducing the need for high clamping forces and minimizing frictional heat, thereby enhancing the uniformity and accuracy of holding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high clamping forces are used to hold the sensor securely, then the holding force is sufficient to prevent sensor movement during operation, but the frictional heat increases the thermal load on the sensor
Solution Approach 1:
The clamping bushing features localized contact zones (protrusions and recesses) that concentrate the clamping force at specific points rather than distributing it uniformly. This allows sufficient holding force to be achieved with lower overall clamping pressure, thereby reducing frictional heat generation while maintaining sensor stability during operation.
2Manufacturing precision
If precise and uniform holding forces are maintained, then sensor operation accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The clamping bushing is segmented into multiple identical protrusion-recess pairs distributed around its circumference. Each pair generates a identical clamping force component, and the superposition of these symmetrically arranged forces results in uniform total holding force on the sensor, achieving precise force distribution through modular repetition rather than complex continuous structures.
3Ease of operation
If simple assembly is enabled through frictional connection, then installation ease is improved, but the holding force may be insufficient to prevent sensor movement
Solution Approach 1:
The clamping bushing design enables self-adjustment during operation: the sensor automatically adjusts its position relative to the protrusions and recesses, and the resilient tongues deform to distribute clamping forces evenly. This self-service mechanism ensures both simple initial assembly and reliable ongoing stability without requiring external adjustment mechanisms.
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
This design reduces the overall thermal and mechanical loads on the sensor, allowing for precise and consistent force measurement, lower production costs, and improved assembly efficiency, while maintaining the required clamping force with minimal tolerance, thus enhancing the quality and process capability from production to customer delivery.
Implementation Method 1
The clamping bush, as in the above Printed illustrated, provided with resilient tongues. The tips of these tabs touch the inside wall of the rod sensor holder bore. The middle parts of the tongues, which are bent inwards, touch the rod sensor and press it onto opposite fixed points of the clamping bush
Implementation Method 2
From the publication 'WABCO Anti-Blocking System', September 81 edition, it is known to mount the rod sensor by means of a clamping bush in a bore of a rod sensor holder with a defined frictional connection
Implementation Method 3
During this automatic air gap adjustment while driving and while doing temporary contact of the magnet wheel with the sensor, z. B. when wheel bearing play occurs and elastic deformations in the axle, additional heat input into the sensor occurs due to frictional heat
Data Source
Figure 1~2
Figure 3~4b
Figure 4c~5
AI summary
The invention relates to an adapter bushing (6) for a sensor (1) for fixing and adjusting the sensor (1) in a non-positive manner in a bore of a retaining piece, wherein the adapter bushing (6) is provided with at least one resilient tongue (2) and at least one fixed point (10), wherein the at least one resilient tongue (2) is connected on one side to the adapter bushing (6) and is freely movable on the tip thereof, wherein at least one lift/guide element (15, 15') is disposed before at least one fixed point (10) and/or at least one resilient tongue (2).