Shaft Support Case Structure for Flexible Power Transmission Assembly
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Solution Overview
Problem
Existing power transmission devices face challenges in improving the freedom of assembly, particularly in integrating components like shaft members and case members efficiently.
Innovation Solution
The power transmission device incorporates a case comprising a first case member with a protrusion and a second case member with a recess, along with a shaft member supported by the protrusion in the recess. An oil passage is formed between the recess and the protrusion in the circumferential direction, enhancing assembly flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rigid integration methods are used for case members and shaft members, then structural strength is maintained, but assembly freedom and flexibility are reduced
Solution Approach 1:
The case is divided into multiple case members (first case member and second case member) that can be assembled separately. The shaft member is supported by protrusions on one case member that engage with recesses on another case member, allowing modular assembly and disassembly while maintaining structural integrity.
Solution Approach 2:
The shaft member is nested within the case structure, supported by protrusions that fit into recesses. This nested arrangement allows the shaft member to be securely positioned while enabling assembly freedom, as the shaft can be inserted and removed through the case members.
2Ease of operation
If shaft members are rigidly fixed in case members, then positioning precision is improved, but assembly flexibility and ease of installation are reduced
Solution Approach 1:
Protrusions and recesses serve as intermediary elements between the shaft member and case members. These intermediaries provide precise positioning for the shaft while allowing easy assembly, as the protrusions guide the shaft into the correct position within the recesses during assembly.
Solution Approach 2:
The protrusions and recesses are pre-formed on the case members and shaft member respectively. This preliminary preparation of positioning features ensures that when assembly occurs, the shaft member automatically achieves precise positioning through the engagement of these pre-formed features, without requiring additional precision work during assembly.
3Ease of manufacture
If case members are designed as single integrated pieces, then manufacturing simplicity is maintained, but assembly freedom and component integration flexibility are reduced
Solution Approach 1:
The case is segmented into multiple case members that can be manufactured separately using standard manufacturing processes. Each case member can be produced independently with simpler tooling, yet when assembled together with the shaft member, they provide the flexibility and integration capabilities of a complex single-piece design.
Solution Approach 2:
The case members are designed with universal features such as protrusions and recesses that can accommodate different shaft members and configuration variations. This multi-functionality allows the same case member design to be used across different applications, improving assembly freedom while maintaining manufacturing simplicity through standardized components.
Data Source
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AI summary
[PROBLEMS] To improve the degree of freedom of assembly. [SOLUTIONS] A power transmission device having: a case formed by assembling a first case member and a second case member; and a shaft member supported by the case, the power transmission device comprising: a protrusion provided to the first case member and protruding in the axial direction along to the direction of assembling the case; and a recess provided to the second case member and recessed in the axial direction. The shaft member is supported by the protrusion in the recess.