Vehicle Shift Device Detent Pin Support Protrusion
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Solution Overview
Problem
The existing shift devices for vehicles face durability issues due to the pivot of the detent pin when it contacts the shift lock member, leading to potential mechanical failure.
Innovation Solution
A support protrusion is designed to protrude from the detent pin towards the proximal end of the cylindrical shaft portion, which restricts the inclination of the detent pin by applying a reaction force opposite to the moment applied during contact with the shift lock member, thereby preventing or reducing the pivot and maintaining the detent pin's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shift lock member contacts one end of the detent pin to block movement, then the shift lock function is achieved, but the detent pin pivots on the contact position as a fulcrum causing durability decrease
Solution Approach 1:
A support protrusion is added to the detent pin that contacts the cylindrical shaft portion to act as an intermediary support point. This prevents the detent pin from pivoting on the shift lock member contact point by providing a fulcrum at the support protrusion, thereby eliminating the harmful pivot motion while maintaining the shift lock function.
Solution Approach 2:
The support protrusion is pre-positioned on the detent pin to contact the cylindrical shaft portion before any pivot motion occurs. This preliminary support arrangement prevents the detrimental pivot action from occurring in the first place, rather than attempting to correct it after the fact.
2Stability of the object's composition
If the detent pin is constantly urged toward the detent rod by a spring, then the detent pin maintains engagement with detent grooves, but the combination of spring force and shift lock member contact creates a moment that causes pivot
Solution Approach 1:
The support protrusion acts as an intermediary support point between the detent pin and the cylindrical shaft portion. It provides a contact point that creates a counterbalancing moment to offset the harmful pivot moment generated by the combination of spring force and shift lock member contact.
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 solution effectively prevents or reduces the pivot of the detent pin, thereby enhancing the durability of the shift device by maintaining its alignment and preventing mechanical failure.
Implementation Method 1
reaction force in the direction opposite to moment that is applied to the detent pin as a result of operating force of the operating button
Implementation Method 2
the support protrusion contacts with the lever pipe to restrict an inclination of the detent pin due to contact between the shift lock link and the detent pin
Data Source
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AI summary
A shift device (10) for a vehicle includes a housing (20) and a shift lever (18). The shift lever includes a cylindrical shaft portion (14) of which a proximal end is pivotably supported inside the housing, the cylindrical shaft portion having elongated holes (39) that extend through a peripheral wall of the cylindrical shaft portion and that are elongated in a longitudinal direction of the cylindrical shaft portion, a shift knob (16) fixed to a distal end of the cylindrical shaft portion, a detent pin (30) inserted through the elongated holes in a state where both ends of the detent pin protrude from the corresponding elongated holes, a detent rod (34) inserted in the cylindrical shaft portion, the detent rod being configured to transmit operating force of an operating button (45) provided in the shift knob to the detent pin, and a shift lock member (56). The detent pin is fitted to the detent rod. When the operating button has been operated in a state where brake depression operation is not performed, the shift lock member contacts with one end of the detent pin to block movement of the detent pin. A support protrusion that protrudes toward the proximal end of the cylindrical shaft portion is provided at the other end of the detent pin. The support protrusion contacts with the cylindrical shaft portion and restricts an inclination of the detent pin due to contact between the shift lock member and the detent pin.