Pivoting Motor Mount for Worm Drive Stability
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Solution Overview
Problem
The existing device for driving a toothed wheel in rotation, used in precision positioning applications, faces issues with the pre-stressing means being disrupted by belt tension, leading to difficulties in fitting and reduced stability of the assembly during operation.
Innovation Solution
The motor is arranged pivotably relative to the worm/sleeve assembly, with a force transfer means connecting the motor's second extremity to the sleeve at the worm's second extremity, uncoupling belt tension and pre-stressing forces, allowing effective prestressing and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is fixed relative to the worm/sleeve assembly, then the structure is simple, but the pre-stressing means cannot function effectively due to belt tension disruption
Solution Approach 1:
The motor mounting structure is segmented into a fixed support structure and a movable motor structure that can pivot relative to the worm/sleeve assembly. This segmentation allows the pre-stressing means to function independently from belt tension effects, resolving the contradiction between reliability and complexity.
Solution Approach 2:
A force transfer means is introduced as an intermediary element between the motor structure and the worm/sleeve assembly. This intermediary transfers forces while allowing the pre-stressing function to operate effectively despite belt tension, maintaining reliability without excessive complexity.
2Stability of the object's composition
If the motor is fixed relative to the worm/sleeve assembly, then the assembly is compact, but the stability of positioning is reduced during operation
Solution Approach 1:
The motor structure is made dynamic by allowing it to pivot relative to the worm/sleeve assembly, rather than being rigidly fixed. This dynamic mounting improves positioning stability during operation while managing the complexity through a controlled degree of freedom.
3Ease of manufacture
If the pre-stressing means is subjected to belt tension, then the structure is simple, but the fitting becomes difficult and positioning stability is reduced
Solution Approach 1:
The pre-stressing function is extracted from the belt tension path by separating the motor structure from the worm/sleeve assembly mounting. This extraction eliminates the harmful effect of belt tension on pre-stressing, improving both ease of fitting and positioning stability.
Data Source
AI summary
A driving device for driving in rotation a toothed wheel, in particular a turntable, has a worm intended to mesh with the toothed wheel, a motor to drive the worm in rotation, a flexible sleeve that partially surrounds the worm in such a way as to form an assembly described as a worm/sleeve assembly, and a pre-stressing unit. The motor is arranged in a structure that is fitted pivotably relative to the worm/sleeve assembly, and the driving device also has a force transfer unit connecting the motor to the sleeve at a second extremity of the worm.