Sensor Unit Bearing Eliminates Fastening Screws
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Solution Overview
Problem
The assembly process of rotational angle measurement systems is prone to faults and complications due to the small assembly space and difficulty in inserting fastening screws, particularly when securing the carrier member with the sensor printed circuit board on the housing part through which the drive shaft extends.
Innovation Solution
A form-fit/force-fit arrangement is used for the bearing means, allowing the carrier member to be movably mounted in the housing arrangement pre-assembled, eliminating the need for separate fastening screws, and ensuring secure mounting only during the final assembly, enabling complete pre-assembly and simple mounting of the sensor unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carrier member with the sensor printed circuit board is fastened on the housing part using separate fastening screws, then the sensor unit is securely mounted, but the assembly process becomes complicated and prone to faults due to small assembly space
Solution Approach 1:
The bearing means integrates multiple functions into a single component: it provides form-fit mounting, force-fit securing, and electrical connection for the sensor printed circuit board. This merging eliminates the need for separate fastening screws while ensuring reliable mounting of the carrier member on the housing part.
Solution Approach 2:
The bearing means serves multiple purposes simultaneously: it acts as a mechanical support structure, a fastening mechanism, and an electrical connection interface. This multi-functionality resolves the contradiction by providing secure mounting without requiring additional fastening components that would complicate the assembly process.
2Ease of operation
If the sensor unit is completely pre-assembled, then transport and handling are simplified, but the assembly space requirements increase
Solution Approach 1:
The sensor unit is divided into modular components (housing part, carrier member, bearing means) that can be pre-assembled to a certain extent. The bearing means enables the carrier member to be movably mounted in the pre-assembled state, allowing partial pre-assembly without requiring excessive assembly space, thus simplifying transport and handling.
3Reliability
If fastening screws are used to secure the carrier member, then the mounting is secure, but the assembly process is very prone to faults
Solution Approach 1:
The bearing means is designed to automatically secure the carrier member to the housing part through its form-fit and force-fit characteristics, eliminating the need for manual insertion and tightening of fastening screws. This self-securing mechanism significantly reduces assembly faults while maintaining reliable mounting.
Data Source
AI summary
A sensor unit for a rotational angle measurement system for detecting a rotational movement of a drive shaft includes a housing arrangement with a pot-shaped housing part, a carrier member, a sensor printed circuit board arranged on the carrier member, and a bearing which, in an operating state, mounts the sensor printed circuit board in a stationary manner in the housing arrangement with respect to the drive shaft. The bearing is a form fit/force fit arrangement so that the carrier member is movably mounted in the housing arrangement in a pre-assembled state.