Shaft Positioning Device with Expandable Centring Elements
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Solution Overview
Problem
Existing devices for positioning and joining functional elements with a hub on a shaft face complexity in guiding the shaft during thermal joining, which hinders precise and efficient alignment and fixation.
Innovation Solution
A device equipped with a tailstock featuring a centring cone and expandable centring elements for coaxial alignment of the shaft and functional elements, along with a movable guide block for precise positioning and fixation, allowing for axial and radial adjustment to simplify the centring process and optimize the joining process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional positioning devices are used, then functional elements can be positioned on the shaft, but the guiding of the shaft during thermal joining becomes comparatively complex
Solution Approach 1:
A guide block is introduced as an intermediary component between the shaft and the positioning device. The guide block features a guide surface that contacts the shaft, providing simplified guidance during thermal joining operations. This intermediary element reduces the complexity of the overall device by consolidating guiding functions into a dedicated component rather than requiring complex integrated mechanisms.
Solution Approach 2:
The positioning device is segmented into distinct functional components: the guide block for shaft guidance, the positioning element for precise location, and the expansion mechanism for fixation. This segmentation allows each component to be optimized independently and simplifies the overall operation by allowing sequential engagement of functions during the thermal joining process.
2Manufacturing precision
If precise alignment is achieved through multiple components, then positioning accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The guide block features a curved guide surface that conforms to the cylindrical shape of the shaft. This curved geometry provides automatic self-alignment through geometric constraints, achieving precise positioning through the inherent geometry of the components rather than requiring additional alignment mechanisms. The spherical/cylindrical contact surfaces naturally guide the shaft into the correct position.
Solution Approach 2:
The positioning system utilizes self-centering mechanisms where the expansion of the positioning element automatically centers itself on the shaft through radial expansion. The geometric design of the guide block and positioning element creates self-aligning forces that automatically achieve precise alignment without requiring complex external adjustment mechanisms or multiple adjustment steps.
Data Source
AI summary
A device for positioning at least one functional element having a hub for a shaft in a predefined angle position on the shaft includes at least one holder for receiving at least one functional element. The device may include a tailstock or coaxially aligning the shaft in relation to the hub of the at least one functional element. The tailstock may include a centring cone for receiving the shaft. The centring cone may be axially displaceable in relation to the tailstock. The tailstock may include radially expandable centring elements for centring the functional element. The centring elements may assume a defined position against the hub of the functional element in an extended position. The device may also include a movable guide block for moving the shaft.