Optical Measuring System Roller Bearing Mounting
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Solution Overview
Problem
Optical measurement systems in geodesy, such as theodolites and total stations, face precision issues due to the displacement of the measurement telescope's position and orientation when the shaft rotates, which is either costly and complex to manufacture and adjust with conventional single-piece or dual-journal shaft mounting methods.
Innovation Solution
An optical measurement system design featuring a base with two housing bodies that rotate orthogonally, utilizing roller bearings and a drive disc with a frictional fit for precise orientation control, eliminating the need for additional bearings and simplifying the mounting process, allowing the measurement telescope's axis to rotate without displacing its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-piece shaft is used to mount the measurement telescope, then the structure is simple, but the measurement precision deteriorates due to eccentric displacement of the measurement axis
Solution Approach 1:
The single-piece shaft is segmented into multiple components: a first housing body, a second housing body, inner roller bearing supports, outer roller bearing supports, and roller bearings. This segmentation allows the measurement telescope to be mounted on one side only, eliminating eccentric displacement while maintaining structural simplicity.
2Measurement precision
If two journal shafts are used to mount the measurement telescope, then the measurement precision is improved by eliminating position displacement, but the manufacturing and adjustment complexity increases
Solution Approach 1:
The complex dual-journal shaft mounting is replaced by extracting only the essential function: mounting the measurement telescope on one side. The roller bearing assembly achieves precise mounting without requiring two-sided journal shaft support, simplifying manufacturing and adjustment.
3Measurement precision
If additional bearings are added to improve mounting precision, then the measurement precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Multiple bearing functions are merged into a compact roller bearing assembly with inner and outer roller bearing supports. The first and second roller bearings work together in an O arrangement to provide both mounting support and precise rotation, eliminating the need for separate journal shafts or additional bearings.
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 design ensures precise angle measurements by stabilizing the rotation of the measurement telescope, reducing manufacturing complexity and costs, while maintaining high precision and stability, and allows for controllable orientation adjustments.
Implementation Method 1
the motor shaft or a wheel fixed to the motor shaft is pressed against said disc by a spring force orientated transversely, in particular orthogonally, to the second axis of rotation
Implementation Method 2
the motor shaft or the wheel being coupled to the drive disc in a frictional fit
Data Source
AI summary
An optical measurement system comprises a first housing body and a second housing body which can be rotated relative to the first housing body about a second axis of rotation, wherein the second housing body contains a measurement telescope, an inner roller bearing support fixed to the second housing body and protruding into the first housing body; an outer roller bearing support fixed to the first housing body; a drive disc fixed to the inner roller bearing support; wherein a motor having a motor shaft is attached to the first housing body in such a way that the motor shaft or a wheel fixed to the motor shaft is positioned on the drive disc and is pressed against said disc by a spring force orientated transversely to the second axis of rotation, and wherein the motor shaft or the wheel is coupled to the drive disc in a frictional fit.