Universal Joint Assembly Tool with Displaceable Bolt Block
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Solution Overview
Problem
Universal joints often experience erroneous assembly due to incomplete fitting of shafts, where the shaft does not reach the normal position, leading to interference with the bolt insertion, causing either incomplete assembly or incorrect fixing.
Innovation Solution
An erroneous assembling preventing tool is introduced, featuring a prevention section that displaces between tabs to prevent bolt insertion when the shaft is not in the normal position, and releases when the shaft is correctly aligned, ensuring proper fixing by abutting against the bolt and allowing screwing into the screw hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft is inserted incompletely into the cylindrical section, then the bolt insertion may be interfered with, but the shaft may still allow bolt insertion in some cases leading to erroneous assembling
Solution Approach 1:
The patent introduces a prevention tool as an intermediary device between the shaft and the bolt. This tool includes a prevention section that physically blocks the bolt insertion path when the shaft is not in the correct position. The prevention tool acts as a mediator that prevents erroneous assembly by interfering with the bolt-shaft interaction, ensuring that the bolt can only be inserted when the shaft is properly positioned in the cylindrical section.
2Reliability
If a prevention tool is added to block bolt insertion, then erroneous assembling is prevented, but the device complexity increases
Solution Approach 1:
The prevention tool is segmented into distinct functional sections: a prevention section with a blocking surface that prevents bolt insertion, and a driving section that enables tool removal. This segmentation allows each part to perform its specific function efficiently. The prevention section specifically blocks the bolt path when needed, while the driving section provides the mechanism for tool removal after proper assembly, thereby managing complexity through functional division.
Solution Approach 2:
The prevention tool incorporates dynamic elements that allow it to be displaced from the prevention position to a retraction position. The driving section, when actuated by pressing the shaft end, moves the prevention section out of the bolt insertion path. This dynamic behavior allows the system to transition between preventing erroneous assembly and allowing proper assembly, reducing overall system complexity by using a single movable component rather than multiple fixed constraints.
Data Source
AI summary
An erroneous assembling preventing tool for a universal joint prevents a shaft from being fixed to a cylindrical section of a yoke main body of the universal joint by fastening a bolt in a state where the shaft is not inserted into a normal position of an axial direction of the cylindrical section. The erroneous assembling preventing tool comprises a fixing section fixed to the yoke main body, a prevention section arranged between first and second tabs of the yoke main body, and a driving section for driving a prevention section. The prevention section is displaceable to a prevention position at which an end of the bolt can be prevented from being inserted through a screw hole of the second tab of the yoke and a prevention release position. The driving section displaces the prevention section to the prevention release position when it is pressed by an end of the shaft inserted into the normal position of the axial direction of the cylindrical section.