Work Vehicle Lever Support Structure Vertical Separation
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Solution Overview
Problem
Existing work vehicles face a challenge in compactly designing the lever supporting structure to accommodate both the speed changer lever and lift lever, which are typically large due to the need for sufficient separation to avoid obstruction during operations, making them cumbersome and difficult to operate from the driver's seat.
Innovation Solution
A work vehicle design featuring a lever supporting structure with a speed changer lever guide face portion and a lift lever guide face portion, where the lift lever guide face is set lower than the speed changer lever guide face, and both guide grooves are parallel, allowing for closer placement without obstruction, and a guard body to prevent accidental contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the speed changer lever and lift lever are disposed sufficiently apart in the transverse direction to avoid obstruction, then the ease of operation is improved, but the size of the vehicle body in the transverse direction is enlarged
Solution Approach 1:
The patent applies vertical dimensionality change by setting the lift lever guide face portion at a lower disposing height than the speed changer lever guide face portion. This vertical separation allows the levers to be disposed closer in the transverse direction while maintaining operational ease, as the hand operating the lift lever can be positioned on the more transversely outer side without obstruction from the speed changer lever.
2Area of stationary object
If the lever supporting structure is made compact by disposing levers closer together, then the vehicle body size is reduced, but the levers may obstruct each other during operation
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension to separate the levers. The lift lever guide face portion is positioned at a lower height than the speed changer lever guide face portion, creating vertical clearance that prevents obstruction while allowing compact transverse arrangement. This enables the lever supporting structure to be compact without compromising operational ease.
3Device complexity
If the speed changer lever and lift lever are supported close to each other in the transverse direction, then the lever supporting structure becomes compact, but the operator's hand may be obstructed when operating either lever
Solution Approach 1:
The patent applies vertical separation by positioning the lift lever guide face portion at a lower disposing height than the speed changer lever guide face portion. This creates sufficient vertical clearance so that when the operator's hand operates the lift lever on the more transversely outer side, it does not obstruct the speed changer lever operation, and vice versa. The parallel guide grooves further facilitate this arrangement.
Data Source
AI summary
A speed changer lever and a lift lever are supported to a lever supporting structure that extends from the front end of an armrest disposed laterally of a driver's eat to the forward side of the vehicle body. A speed changer lever guide face portion is provided at a transversely inner portion of an upwardly oriented face of the lever supporting structure. A lift lever guide face portion is provided at a transversely outer portion of the upwardly oriented face of the ever supporting structure. The lift lever guide face portion is set at a disposing height lower than the speed changer lever guide face portion. An upper end of the lift lever is set at a disposing height lower than the upper end of the speed changer lever. A speed changer lever guide groove and a lift lever guide groove are disposed parallel to each other.