Vehicular Shift Range Switching Device with Automatic Parking Engagement
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Solution Overview
Problem
Existing shift range switching devices for vehicles do not automatically switch to a parking range when the ignition is turned off, leading to potential abrupt movement when the vehicle is restarted in a shift range other than the parking range.
Innovation Solution
A shift range switching device with a rotary unit, gear part, and locking mechanism that automatically rotates to a parking position when the ignition is turned off, using a cam, elastic members, and sensors to ensure the transmission is shifted to the parking range, preventing abrupt movement upon restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift range switch is positioned at a different position from the shift range in the related art, then the transmission can be automatically shifted to a parking range when ignition is turned off, but the vehicle may move abruptly when restarted after ignition is turned off in a shift range other than the parking range
Solution Approach 1:
The gear part automatically rotates the rotary unit to the parking range position before the driver can operate the shift range switch, or simultaneously with ignition shutdown. This preliminary action ensures the transmission is already in parking range when the vehicle is restarted, preventing abrupt movement while maintaining the ability of the driver to override this automatic positioning if needed
2Reliability
If a gear part is added to automatically rotate the rotary unit to parking range when ignition is turned off, then the transmission is shifted to parking range, but the device complexity increases
Solution Approach 1:
The gear part is integrated with the existing rotary unit and shift range switching mechanism. The gear part shares the same rotational axis and working space as the rotary unit, combining the automatic parking range positioning function with the existing shift range switching structure. This merging approach adds the automatic control function while minimizing the increase in overall device complexity
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 device effectively moves the shift range to a parking position when the ignition is turned off, preventing the vehicle from moving abruptly upon restart, ensuring safety and stability.
Implementation Method 1
a first elastic member inserted in a lower end of the shaft, a slide pin inserted in the shaft so as to penetrate the shaft in a direction perpendicular to the axial direction thereof
Implementation Method 2
The slide pin may have a second elastic member coupled between both ends thereof, and the second elastic member may provide elastic force to the both ends of the slide pin
Implementation Method 3
The both ends of the slide pin may come into frictional contact with an inner peripheral surface of the cam
Implementation Method 4
a detent groove may be formed on the inner peripheral surface of the cam, so that the slide pin is caught by the detent groove by the elastic force of the second elastic member
Implementation Method 5
a solenoid coupled to one side of the stationary block so as to move the stationary block in a forward or backward direction
Data Source
AI summary
A vehicular transmission range switching device is provided which: a cover part with one side containing a display part for displaying the transmission range, a knob handling part inserted in the cover part so as to be arranged in a side of the display part, a rotary unit consisting of a shaft inserted in the lower side of the knob handling part, a moving block inserted in the upper side of the shaft, and a stopper inserted in the lower side of the shaft, that rotates along with the knob handling part, a gear part connected to the lower part of the rotary unit for turning the rotary unit to the parking range when shutting the vehicle off, a body part consisting of a locking part for limiting the turning of the rotary unit, and a sensing part for sensing the turning of the rotary unit and the gear part.