Work Vehicle Rear Control Lever with Cam Neutral Return
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Solution Overview
Problem
Conventional work vehicles require operators to change positions to control speed, which complicates operations and increases costs due to complex constructions and potential mechanical issues.
Innovation Solution
A work vehicle with a hydrostatic stepless change speed device and a change speed pedal mechanism, along with a travel-control lever and mechanical interlocking mechanism, allowing operators to control speed while maintaining a rearward-facing position, simplifying the construction and reducing costs by using a cam mechanism for neutral position return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex linkage mechanism is used to connect the change speed pedal to the hydrostatic stepless change speed device, then the control function is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the traditional complex mechanical linkage system with a hydrostatic transmission system using a variable displacement motor. The change speed pedal directly controls the displacement of the variable displacement motor, which in turn controls the traveling device speed, eliminating the need for complex mechanical linkages and reducing device complexity while maintaining full control functionality.
2Reliability
If a mechanical return mechanism is added to ensure the travel control lever returns to neutral position, then the control reliability improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a spring mechanism that automatically returns the travel control lever to its neutral position when the operator releases it. This self-returning mechanism eliminates the need for complex powered return systems or manual intervention, achieving reliable neutral position recovery through a simple, automatic spring-based system that reduces 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
Enables efficient and precise control of the vehicle and attached implements from a rearward-facing position, reducing mechanical complexity and operational burdens, while ensuring smooth return to neutral positions without chattering issues.
Implementation Method 1
a cam mechanism linked to the change speed pedal for urging the change speed pedal to return to a neutral position of the change speed pedal
Data Source
AI summary
A work vehicle operable in a rearward facing position using a simple construction is disclosed. The work vehicle includes a hydrostatic stepless change speed device for transmitting power from an engine to a traveling device, a change speed pedal mechanism operable in a forward facing position for changing speeds in the hydrostatic stepless change speed device, and a travel-control lever provided at a rear position of a vehicle body and operable in the rearward facing position. The travel-control lever and the change speed pedal mechanism are linked to each other through a mechanical interlocking mechanism so as to control the hydrostatic stepless change speed device by the travel-control lever through the change speed pedal mechanism.