Rotor Position Sensor Holder With Fastening Ring Bearing Support
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Solution Overview
Problem
Existing installation assemblies for electronically commutated motors face challenges in securely anchoring the signal transmitter to the machine shaft without additional support tools, especially in constrained spaces like those found in motor vehicles.
Innovation Solution
The use of a tolerance ring or fastening ring to axially pretension the bearing rings of a rolling bearing, allowing the ring to be supported on the inner ring of the rolling bearing, thereby eliminating the need for additional support tools during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tolerance ring is used to provide a rotationally fixed connection between the signal transmitter and the machine shaft, then the signal transmission reliability is improved, but the axial support function is lost and additional support tools are required during installation
Solution Approach 1:
The tolerance ring is designed to perform multiple functions: it provides both the rotationally fixed connection for signal transmission and the axial support function during installation. The ring's structure allows it to interact with both the machine shaft and the signal transmitter hub, enabling it to serve as both a fastening element and a support element simultaneously.
Solution Approach 2:
The tolerance ring utilizes its own structural features to provide axial support during installation without requiring external support tools. The ring's interaction with the machine shaft and signal transmitter creates self-supporting conditions that enable the installer to complete the assembly without additional equipment.
2Manufacturing precision
If additional support tools are used to prevent relative movement during installation, then the installation precision is improved, but the device complexity increases
Solution Approach 1:
The axial support function is extracted from external support tools and integrated into the tolerance ring itself. This eliminates the need for separate support tools during installation, reducing device complexity while maintaining installation precision through the ring's inherent structural capabilities.
3Reliability
If lock rings are used to fix the rolling bearing axially, then the bearing fixation reliability is improved, but the device complexity increases
Solution Approach 1:
The axial fixation function previously requiring separate lock rings is merged into the tolerance ring's functionality. The tolerance ring's interaction with the rolling bearing and machine shaft provides both rotational fixation and axial support, eliminating the need for additional lock rings and reducing overall component quantity.
Solution Approach 2:
The tolerance ring is designed as a multi-functional component that simultaneously provides rotational fixation, axial support during installation, and axial positioning of the rolling bearing. This consolidates multiple functions into a single component, reducing device complexity while maintaining fixation reliability.
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 solution provides a secure and space-efficient method for anchoring the signal transmitter, reducing the risk of relative movement between the tolerance ring and the machine shaft, and eliminating the need for additional components like lock rings.
Implementation Method 1
The tensioning force of the rolling bearing is provided by a spring element, which is arranged on the opposite side of the rolling bearing and loads the associated outer ring of the rolling bearing
Implementation Method 2
the fastening ring or tolerance ring protrudes axially with one of the ends from a fastening portion of the cup-shaped holder of the signal transmitter and is supported with this protruding end on the inner ring of the rolling bearing
Data Source
AI summary
An installation assembly. In installation assembly includes a machine shaft, a second rolling bearing having an inner ring and and an outer ring, for rotatably bearing the machine shaft in a housing block, and a signal transmitter of a rotor position sensor having a transmitter element and a cup-shaped holder for electrical detection of an angle of rotation of the machine shaft. Between a fixing portion of the cup-shaped holder and the circumference of the machine shaft there is an annular gap in which a fastening ring is inserted, using which the signal transmitter is rotationally and axially fastened to the machine shaft. One of the ends of the fastening ring protrudes axially out of the cup-shaped holder and is supported axially on the inner ring of the rolling bearing by this protruding end. A method for installing an installation assembly, and an electrically commutated motor, are also described.