Eccentric Return-to-Neutral Assembly for Steering Lever Stability
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Solution Overview
Problem
Riding lawn care vehicles with separate steering levers lack an efficient mechanism to return to a neutral state when not in use, leading to unintended movement.
Innovation Solution
A return to neutral assembly featuring a mounting bracket, adjustment lever, torsion spring, and eccentric adjustment assembly that biases the steering assembly into a neutral position when not in use, using a torsion spring with legs that maintain contact with the adjustment lever to ensure neutral positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate steering levers are employed to control drive wheels independently, then steering functionality and maneuverability are improved, but the vehicle lacks automatic return to neutral capability causing unintended movement
Solution Approach 1:
The torsion spring is pre-loaded to store elastic potential energy that automatically acts to return the steering lever to the neutral position when released. This preliminary action ensures the vehicle returns to a stable stationary state without requiring operator intervention after steering input is removed.
Solution Approach 2:
The return-to-neutral mechanism is self-actuating through the torsion spring that automatically biases the steering lever back to center position. The system serves itself by using the stored elastic energy in the spring to counteract any displacement from neutral, eliminating the need for external power sources or complex control systems.
2Reliability
If a return to neutral mechanism is added to bias the steering assembly into neutral state, then stationary stability is improved, but device complexity increases
Solution Approach 1:
The invention extracts only the essential return-to-neutral function from complex powered steering systems by using a simple torsion spring mechanism. This minimalistic approach achieves the desired stability without incorporating motors, sensors, or control electronics that would increase complexity.
Solution Approach 2:
The torsion spring is a simple, inexpensive mechanical component that provides reliable return-to-neutral functionality. While the spring will eventually fatigue and need replacement, its low cost and simplicity make it an economical solution compared to complex electronic steering systems.
3Measurement precision
If the torsion spring legs maintain continuous contact with the adjustment lever, then neutral positioning precision is improved, but friction and wear increase
Solution Approach 1:
The eccentric adjustment assembly acts as an intermediary mechanism between the torsion spring and the steering lever. It translates the spring's rotational force into linear motion that pushes the lever to neutral, reducing direct friction contact while maintaining positioning precision through the mechanical advantage of the eccentric geometry.
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
Ensures the riding lawn care vehicle remains stationary when the steering levers are not actively engaged, preventing unwanted movement and enhancing user convenience and control.
Implementation Method 1
a torsion spring which may be disposed coaxially with the transmission shaft
Implementation Method 2
The first leg and the second leg may each extend proximate to the adjustment lever at a second end of the adjustment lever and to the eccentric adjustment assembly when the adjustment lever may be at the neutral position
Data Source
AI summary
A return to neutral assembly may include a mounting bracket that may be configured to operably couple the return to neutral assembly to a transmission, an adjustment lever which may operably couple a steering assembly to a transmission shaft of the transmission, a torsion spring which may be disposed coaxially with the transmission shaft, and an eccentric adjustment assembly which may define a neutral position for the adjustment lever. The torsion spring may include a first leg and a second leg which may each extend proximate to the adjustment lever at a second end of the adjustment lever and to the eccentric adjustment assembly when the adjustment lever may be at the neutral position. One of the first leg or the second leg may lose contact with the eccentric adjustment assembly while maintaining contact with the adjustment lever when the adjustment lever may move away from the neutral position.