Shift Device Cam Abutting Face Angle Optimization
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Solution Overview
Problem
Existing shift devices have limited movement stroke of the movement member with respect to the rotation angle of the cam member, restricting the effective range of rotation restriction and release.
Innovation Solution
The shift device incorporates a cam member with a rotatable cam face that allows the movement member to move laterally, with the cam member rotated in specific directions to maximize the movement stroke by positioning the abutting face at angles excluding or including intersections with a line from the cam's center, enabling a larger movement stroke relative to the rotation angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cam member is rotated to move the movement member, then the rotation restriction and release function is achieved, but the movement stroke of the movement member with respect to the rotation angle of the cam member is limited
Solution Approach 1:
The patent applies dimensionality change by positioning the abutting face of the movement member at an angle θ (0 < θ < 90°) relative to the radial direction of the cam member, rather than perpendicular to it. This angular offset transforms the cam mechanism from a standard radial actuation into an oblique actuation system, where the movement member abuts the cam face at a location excluding the position where a line from the center of rotation intersects the cam face. This geometric modification enables the movement member to achieve a larger displacement stroke for a given cam rotation angle, effectively resolving the contradiction between movement stroke and rotation angle.
2Ease of operation
If the abutting face is positioned at the intersection point of the line from cam center, then the cam structure is simplified, but the movement stroke of the movement member is reduced
Solution Approach 1:
The patent employs parameter changes by modifying the angular parameter θ of the abutting face orientation. Instead of setting θ = 0° (perpendicular to radial direction, at intersection point), the patent specifies 0 < θ < 90°, optimizing this angular parameter to maximize movement stroke efficiency. This parameter optimization allows the movement member to be actuated more effectively by the cam rotation, achieving larger displacement for the same cam rotation angle while maintaining a relatively simple cam structure.
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
This configuration allows for a larger movement stroke of the movement member with respect to the cam member's rotation angle, enhancing the efficiency and range of rotation restriction and release, and enabling quicker engagement and disengagement of the lock mechanism.
Implementation Method 1
a cam member that is rotatable, that is provided with a cam face, and that is configured to be rotated in one direction or another direction, such that the movement member is moved toward the one side or the another side in a state in which the movement member is abutted on the cam face
Data Source
AI summary
When a lock bar is moved in a state in which a cam is rotated and an abutting face is abutted on a cam face of the cam, the abutting face is abutted on a circumferential face of the cam at a location excluding a lock bar moving direction position with respect to a center of rotation. Accordingly, a movement stroke of the lock bar with respect to a rotation angle of the cam can be increased.