Oil Pump Motor Stator Centering With Integrated Screw Receivers
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Solution Overview
Problem
Existing electric motor designs for oil pumps in motor vehicles fail to securely fix and center the stator on the function carrier, leading to insufficient positioning and potential breakage of plastic centering domes under load, along with plastic particle scraping during assembly.
Innovation Solution
The electric motor incorporates screw receivers with specific cross-sectional shapes that serve as both fastening and centering means, forming statically defined centering pairs with lead-through apertures to securely attach and center the stator on the function carrier, using metal threaded bushings to enhance robustness and prevent plastic particle scraping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plastic centering domes are used to center the stator on the function carrier, then the stator can be positioned, but the domes break under load and scrape plastic particles during assembly
Solution Approach 1:
The patent changes the material parameter from plastic to metal for the centering domes (now called screw receivers). This material parameter change increases the mechanical strength and load-bearing capacity, preventing breakage under operational loads while maintaining the centering function during assembly.
Solution Approach 2:
The patent employs a hybrid approach where metal threaded bushings are integrated into the plastic function carrier. The metal screw receivers provide the necessary mechanical strength for centering and load-bearing, while the plastic carrier provides electrical insulation and structural support, creating a composite solution that addresses both positioning accuracy and structural integrity.
2Manufacturing precision
If screw receivers protrude from the contact contour to serve as centering means, then the stator can be centered, but the system becomes more complex
Solution Approach 1:
The screw receivers are designed to perform multiple functions simultaneously: they serve as centering domes for precise positioning of the stator, as threaded fasteners for securing the stator to the function carrier, and as load-bearing elements. This multi-functionality eliminates the need for separate centering features, reducing overall structural complexity while maintaining high centering precision.
Solution Approach 2:
The patent merges the centering function and the fastening function into a single integrated feature - the screw receiver. By combining these two functions that were previously performed by separate elements (centering domes and screw holes), the design simplifies the overall structure while achieving both precise centering and secure fastening.
Data Source
AI summary
An electric motor, in particular for an oil pump, comprising a rotor and a stator, wherein the stator has through-openings, which are continuous in the axial direction, for screw elements, and comprising a functional support, which is arranged on an end face with respect to the axial direction of the stator and which has a contoured contact section for the stator and screw receiving areas for the screw elements. The screw receiving areas protrude out of the contoured contact section for the stator in the axial direction, and the screw receiving areas are received in the through-openings.