Concave Drive Shaft With Internal Coupling Post
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Solution Overview
Problem
The combination of a power tool and sleeve is too long, making it difficult to operate in narrow environments after assembly, as the connecting and working sections protrude outside the tool, preventing it from reaching the work position.
Innovation Solution
A concave drive shaft with a recess and a coupling post that engages with the sleeve's working section, allowing the sleeve to be firmly coupled to the drive shaft while only the working section extends outside the tool, thereby shortening the overall length and enabling operation in confined spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the connecting section and working section are located outside the power tool, then the assembly is easy to manufacture and assemble, but the total length becomes too long for narrow working environments
Solution Approach 1:
The connecting section is positioned inside the power tool chamber and nested within the drive shaft structure, while only the working section extends outward. This nesting arrangement allows the connecting section to be securely integrated within the tool body, significantly reducing the total length while maintaining assembly simplicity through the modular coupling post design.
2Ease of operation
If the sleeve is assembled to the power tool with both connecting and working sections outside, then the working section can easily contact the workpiece, but the power tool cannot reach narrow working positions
Solution Approach 1:
The working section is extracted and positioned outside the power tool chamber, while the connecting section is extracted and repositioned inside the chamber. This selective extraction allows the working section to maintain its ability to contact workpieces easily, while the connecting section's internal placement reduces the overall tool length for accessing narrow spaces.
3Reliability
If the coupling post extends fully outside the tool, then the sleeve can be securely coupled, but the overall length increases preventing access to confined spaces
Solution Approach 1:
The coupling post is repositioned along the longitudinal dimension to extend into the chamber rather than outward, changing the spatial dimension of coupling from external to internal. This dimensional change maintains secure coupling through the engagement of the coupling post with the recess while reducing the external length, enabling access to confined spaces.
Data Source
AI summary
A concave drive shaft in combination with a power tool includes: the power tool, a drive shaft and a sleeve. The drive shaft is disposed in a power tool, and has a recess. The sleeve has a coupling post provided for inserting into the recess, so that the sleeve is assembled to the drive shaft. The position where the sleeve is connected to the drive shaft is located in the power tool, so that the portion of the sleeve located outside the power tool is shortened, which allows the power tool to be used in a narrow working environment after the sleeve is assembled to the power tool.