Truck Wheel Speed Sensor Cap Fixing With Integrated Sealing
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Solution Overview
Problem
Existing wheel speed sensors for trucks are not cost-effective, simple to assemble, or robust, particularly due to complex fixation mechanisms and potential fluid ingress issues.
Innovation Solution
A wheel speed sensor design featuring a metal cap with integrated spring elements and a plastics-material housing, where the cap is clinched onto the housing using a form-fit mechanism, providing a tight seal and easy assembly, and optionally utilizing an annular seal or O-ring for fluid protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a metal cap with spring elements is used to fix the wheel speed sensor in the stub axle bore, then the sensor can be easily assembled and fixedly positioned, but the manufacturing complexity and cost increase
Solution Approach 1:
The cap integrates multiple functions into a single component: it provides structural support, houses the clamping device with spring elements for fixation, and incorporates sealing functionality. This merging eliminates the need for separate fixation mechanisms and reduces assembly steps while maintaining ease of installation.
Solution Approach 2:
The spring elements are designed to automatically engage with the stub axle bore when the cap is inserted, providing self-fixing capability without requiring additional fasteners or complex assembly operations. The elastic deformation of spring elements enables automatic clamping and positioning.
2Ease of operation
If the cap is clinched onto the plastics-material housing using a form-fit mechanism, then assembly is simplified, but the manufacturing precision requirements increase
Solution Approach 1:
The form-fit connection utilizes controlled material deformation parameters, where the cap material is designed to undergo elastic-plastic deformation during clinching to achieve a tight fit. This allows tolerance compensation and reduces precision requirements compared to rigid interference fits.
Solution Approach 2:
The combination of metal cap and plastics-material housing creates a composite structure that leverages the complementary properties of both materials: the metal cap provides strength and elasticity for form-fit deformation, while the plastics housing provides damping and tolerance absorption, reducing overall precision requirements.
3Reliability
If an annular seal or O-ring is added to prevent fluid ingress, then the sealing performance improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The sealing functionality is merged into the cap structure itself through integrated sealing elements or cooperative sealing surfaces between the cap and housing. This eliminates the need for separate sealing components while maintaining effective fluid protection.
Solution Approach 2:
The sealing mechanism utilizes flexible elastic deformation of the cap material and/or integrated sealing elements to create effective fluid barriers. The flexible nature of the sealing surfaces allows for tolerance compensation and maintains sealing under varying operating conditions without requiring complex rigid sealing structures.
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 design results in a cost-effective, robust, and easily assembled wheel speed sensor with enhanced sealing and protection against fluid ingress, suitable for truck wheel speed monitoring.
Implementation Method 1
The clamping device preferably comprises a plurality of spring element which are disposed on the external shell of the cap, or sleeve, respectively, and which are connected, in particular so as to be integral, to said cap
Implementation Method 2
the staking, or the clinching, respectively, between the cap and the first plastics-material housing to be configured substantially as a form-fit
Implementation Method 3
The cap is expediently configured such that the metal periphery on the open side, or the open end of the cap, respectively, is configured so as to bulge outward
Implementation Method 4
The sensor preferably has an annular seal or O-ring, respectively, which is in particular disposed in a groove about the first plastics-material housing and, in the case of a sleeve plug-fitted onto the first plastics-material housing, forms a seal
Implementation Method 5
The annular seal is particularly preferably configured from elastomer
Data Source
AI summary
A wheel speed sensor includes at least one sensor element, at least one signal processing circuit, as well as at least one first plastics-material housing which houses or at least partially exposes the sensor element and the signal processing circuit, wherein the sensor has a cap, in particular from metal, wherein the sensor has a clamping device which is connected so as to be integral to the cap and/or is integrated in the cap.