Gear Cover Alignment Using Projection-Guided Shaft Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing gear devices face difficulties in guiding the cover to the intended coupling position due to differences in shaft dimensions and coupling mechanisms, making precise alignment challenging.
Innovation Solution
Incorporating a positioning portion with a projection and a fitting hole that guides the cover to a predetermined position on the housing, where the projection enters the fitting hole before the second shaft is fully inserted, ensuring accurate alignment and easy coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover is coupled to the housing using shafts, then the cover is secured to the housing, but the differences in shaft dimensions make it difficult to guide the cover to the intended coupling position
Solution Approach 1:
A positioning portion consisting of a projection on one component and a fitting hole on the other component is introduced as an intermediary alignment mechanism. This positioning portion guides the cover to the correct coupling position relative to the housing before the shafts are fully inserted, resolving the alignment difficulty while maintaining coupling stability through the shafts.
Solution Approach 2:
The positioning portion performs preliminary alignment action before the main coupling operation. By establishing the correct relative position between the cover and housing through the projection and fitting hole interaction, the system ensures proper alignment is achieved before the shafts are fully inserted and the coupling is completed.
2Manufacturing precision
If the projection enters the fitting hole before the second shaft is fully inserted, then accurate alignment is achieved, but the coupling sequence becomes more complex
Solution Approach 1:
The coupling process is segmented into distinct stages: first the projection enters the fitting hole to establish alignment, then the shafts are inserted. This segmentation allows the alignment function to be performed separately and independently from the coupling function, achieving high alignment precision without significantly increasing overall complexity.
Solution Approach 2:
The projection-entering-fitting-hole action is performed as a preliminary step before the shaft insertion is completed. This preliminary alignment action simplifies the overall coupling sequence by breaking it into manageable steps, where each step has a clear purpose and can be executed independently.
Data Source
AI summary
A gear device includes a housing, a cover, and a positioning portion. The cover includes a first bearing that receives a first shaft and a second bearing that receives a second shaft. The positioning portion includes a projection that projects from one of the housing or the cover parallel to the first shaft or the second shaft and a fitting hole that is formed in the other one of the housing or the cover to receive the projection. The projection has a length that is set so that when coupling the cover to the housing, in a state in which the first shaft is inserted through the first bearing, the projection enters the fitting hole before the distal end of the second shaft enters the second bearing.