Shift Lever Detent Rod Assembly With External Insertion
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Solution Overview
Problem
Existing shift devices face challenges in achieving a simple assembly structure for the engagement body (detent rod) with the shift body, requiring complex insertion methods and multiple components, which complicates the assembly process.
Innovation Solution
A shift device design where the engagement body (detent rod) is temporarily attached to the shift body before connecting the operation section, utilizing an urging member to support the detent rod and allowing easy assembly by engaging with a restricting body, reducing the need for intricate center insertion and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the detent rod is assembled inside the shift lever, then the structural integrity is improved, but the assembly complexity increases
Solution Approach 1:
Instead of assembling the detent rod from the inside of the shift lever, the patent inverts the assembly approach by inserting the detent rod from the outside through an opening. This reversal of the assembly direction simplifies the assembly process while maintaining structural integrity, as the detent rod can be directly inserted and engaged with the detent plate without requiring complex internal routing or disassembly of the shift lever.
2Reliability
If multiple components are used for the detent mechanism, then the functional reliability is improved, but the number of parts increases
Solution Approach 1:
The patent combines the detent rod and detent pin into a single integrated detent rod component. The detent rod includes a cylindrical body portion and a detent pin portion that are formed as one piece, eliminating the need for separate detent pin and detent rod components. This merging maintains the functional reliability of the detent mechanism while reducing the total number of parts that need to be assembled and managed.
3Manufacturing precision
If complex insertion methods are used, then the positioning precision is improved, but the ease of assembly deteriorates
Solution Approach 1:
The detent rod is designed with self-aligning features including a cylindrical body portion that fits into a corresponding cylindrical recess in the shift lever, and a detent pin portion that automatically engages with the detent plate. The spring-loaded design allows the detent rod to self-adjust and self-position during assembly, eliminating the need for complex alignment procedures or specialized insertion tools while maintaining precise positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design facilitates easier and more efficient assembly of the engagement body to the shift body, allowing for straightforward integration and operation, while also reducing the number of components and press-operation force required, enhancing usability and reliability.
Implementation Method 1
an urging member that is penetrated by the engagement body (detent rod) and that urges the engagement body toward one side
Data Source
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AI summary
In a shift lever device 10, a detent rod 28 is assembled to a lever main body 14, and when a detent pin 32 of the detent rod 28 engages with a detent body and rotation is stopped, a lever 12 is restricted from rotating. When a button 24 is press-operated, the detent rod 28 is displaced, engagement of the detent pin 32 with the detent body is released, and the lever 12 is allowed to rotate. The detent rod 28 is assembled to the outside of the lever main body 14. This enables to detent rod 28 to be easily assembled to the lever main body 14.