Vehicle Shift Lever Layout for Low-Fatigue Gear Selection
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Solution Overview
Problem
Existing shift devices for vehicles do not adequately reduce driver fatigue during operation, particularly in changing gear positions, and may lead to safety concerns due to the need for drivers to apply strength and maintain focus on indicators for shift position recognition.
Innovation Solution
A shift device with a shift lever that is inclined relative to the driver's seat when in gear positions other than parking, allowing for a more natural hand movement and reducing muscle strain, and featuring a second upright position for the parking gear to enhance recognition without looking at indicators, thereby reducing driver fatigue and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift lever is positioned upright for all gear positions, then the device structure is simple, but the driver experiences arm fatigue during gear changes
Solution Approach 1:
The shift lever is designed to dynamically change its inclination angle based on the gear position. When the shift selector is in traveling positions (P, R, N, D), the shift lever inclines away from the driver's seat to reduce arm fatigue. When the shift selector is in the parking position, the shift lever becomes upright to enhance recognition. This dynamic adjustment resolves the contradiction by adapting the shift lever position to different operational requirements.
2Ease of operation
If the shift lever is inclined away from the driver's seat for traveling positions, then driver arm fatigue is reduced, but the recognition of shift position may be less intuitive
Solution Approach 1:
The shift lever adopts different local qualities (inclination angles) for different gear positions. For traveling positions, it inclines at a specific angle to reduce arm fatigue. For the parking position, it becomes upright to provide intuitive recognition. This local differentiation allows the system to optimize for both comfort and recognition in different operational contexts.
3Device complexity
If all shift positions (P-R-N-D) are arranged in line in the vehicle longitudinal direction, then the shift operation is simple, but the device size becomes large
Solution Approach 1:
The shift positions are arranged in a two-dimensional layout rather than a single linear arrangement. The shift selector can move in both the vehicle longitudinal direction (for R-N-D positions) and the vehicle lateral direction (for P position). This dimensional change allows compact packaging of all four shift positions while maintaining clear, intuitive operation paths.
Data Source
AI summary
A shift device comprises a shift lever and a shift knob. A driver moves the shift knob in a longitudinal direction when a shift change is conducted between plural traveling positions. The driver moves the shift knob, in a lateral direction, toward a driver's side when the shift change is conducted from a R position to a P position. When viewed from a vehicle rear side, the shift lever located at the traveling positions takes a first position where the shift lever is inclined, relative to its upright state, in a direction of separating its upper end portion with the shift knob from a driver's seat, whereas the shift lever located at the P position takes a second position where the shift lever is in the upright state or in a state which is closer to the upright state than the first position.