Shift Lever Lock Bar Actuation With Cam-Based Position Switching
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Solution Overview
Problem
Existing shift devices lack efficient mechanisms for switching between restricting and permitting changes in shift positions, leading to precision and control issues.
Innovation Solution
A shift device comprising a shift body, a restriction section, and an operation section, where the restriction section is moved between a restricting and non-restricting position using a rotation section or motor, allowing precise control over the shift position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a button is operated to drive a solenoid to pivot the restricting link, then the shift position change is permitted, but the switching precision and control accuracy are insufficient
Solution Approach 1:
The patent replaces the solenoid-driven pivoting mechanism with a rotation section that rotates about a rotation axis. This mechanical substitution provides more precise control over the restriction section's position, as rotational movement can be controlled with higher precision than linear solenoid actuation, thereby resolving the contradiction between reliability and position control precision.
2Ease of operation
If the restriction section is moved between restricting and non-restricting positions, then shift position change control is improved, but the movement stroke becomes large
Solution Approach 1:
The patent changes the movement dimension of the restriction section from linear translation to rotational movement about an axis. By rotating the restriction section about a rotation axis rather than moving it linearly between positions, the patent achieves the required position control with a smaller overall movement stroke, resolving the contradiction between ease of operation and movement stroke length.
3Adaptability or versatility
If the restricting position is made variable, then the switching flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent designs the rotation section to provide universal positioning capability, where a single rotational mechanism can achieve both restricting and non-restricting positions as well as intermediate positions. This multi-functional design allows the restriction section to be positioned flexibly without requiring separate mechanisms for each position, thereby maintaining simplicity while achieving switching flexibility.
Data Source
AI summary
In a shift lever device, a lock bar is disposed in a restricting position to restrict changing of a shift position of a lever. A motor is driven to rotate a cam in order to move the lock bar to a non-restricting position, thereby permitting changing of the shift position of the lever. The lock bar is moved as the rotation position of the cam is changed. This enables the precision required of the rotation position of the cam in order to dispose the lock bar in the restricting position and the non-restricting position to be lowered, thereby enabling appropriate switching between restriction and permission of changes in shift position of the lever to be performed by driving of the motor.