Conical Bearing Unit Mounting for Fast Test Stand Realignment
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Solution Overview
Problem
Existing test stands require a time-consuming and elaborate realignment process when the bearing unit is exchanged due to high loads, which can lead to wear and falsification of measurement results during acoustic, vibration, torque, and function tests.
Innovation Solution
A truncated cone-shaped recess in the bearing housing allows for a rotationally fixed and detachable bearing sleeve with a through-going bearing bore, ensuring accurate coaxial alignment and direct load transfer, eliminating the need for further alignment and facilitating rapid replacement of the bearing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bearing unit is exchanged due to wear from high loads, then the bearing unit can be replaced, but a time-consuming and elaborate realignment process is required to maintain accurate coaxial alignment between the test stand drive and bearing shaft
Solution Approach 1:
The truncated cone-shaped recess is pre-formed in the bearing housing with precise geometry that guarantees coaxial alignment. The bearing sleeve is pre-configured with an outer conical wall matching this geometry, so that when assembled, the coaxial alignment is automatically achieved without requiring subsequent realignment operations.
Solution Approach 2:
The self-aligning mechanism is built into the geometry of the recess and bearing sleeve. The conical surfaces automatically guide the bearing sleeve into correct coaxial position during assembly, making the system self-aligning without external intervention or complex adjustment procedures.
2Ease of repair
If the bearing unit is exchanged, then the worn bearing can be replaced, but the elaborate fitting process complicates the replacement procedure
Solution Approach 1:
The precise coaxial geometry is pre-established through the truncated cone-shaped recess and matching bearing sleeve design. This preliminary geometric configuration ensures that simple assembly actions automatically achieve the required alignment, eliminating complex fitting procedures.
Solution Approach 2:
Instead of using complex alignment mechanisms or procedures to achieve coaxial alignment, the invention inverts the approach by using simple conical geometry that passively self-aligns the components. The complexity is reduced from active alignment mechanisms to passive geometric guidance.
3Measurement precision
If the rotation axis of the test stand drive and bearing shaft are not accurately coaxial, then assembly is simpler, but measurement results are falsified
Solution Approach 1:
The system performs self-alignment through the geometric relationship between the truncated cone-shaped recess and the bearing sleeve's outer conical wall. This self-aligning mechanism automatically ensures accurate coaxial positioning without requiring external alignment procedures or high-precision manual adjustment.
Solution Approach 2:
The coaxial alignment is pre-guaranteed by the precise geometric design of the recess and bearing sleeve. The truncated cone shape with its specific angle (between 5° and 10°) creates an automatic guidance system that ensures the bearing shaft and test stand drive rotation axes are accurately coaxial before the bearing unit is even installed.
Data Source
AI summary
A test stand includes a base frame and a bearing housing defining a frustoconical recess. A bearing unit has a bearing sleeve defining a through-going bearing bore coaxial with a rotation axis. A bearing shaft is rotatably mounted in the bearing bore. A contour of an outer conical wall of the bearing sleeve is at least partially identical with a contour of the frustoconical recess, where the bearing unit is detachably arranged in contact with the frustoconical recess. A fixing element on the distal end of the bearing shaft is configured for detachably fixing a test object. A test stand drive is arranged on the base frame and has a test shaft configured to be driven in rotation about the rotation axis, where the test shaft is configured to be connected coaxially to the bearing shaft of the bearing unit.