Neutral Biasing Mechanism for Smoother CVT Pedal Return
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Solution Overview
Problem
Conventional working vehicles with neutral biasing mechanisms apply biasing force at a single point, limiting the adjustment of biasing force and leading to uneven spring load between the beginning and maximum depression of the speed change pedal.
Innovation Solution
A neutral biasing mechanism with multiple biasing members connected to different points on an operator, allowing for the combination of biasing forces and action points, distributing load and enabling easier adjustment of biasing force, including the use of coil springs with varying lengths and diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one biasing member is located at one point in the neutral biasing mechanism, then the structure is simple, but the biasing force cannot be adjusted and the spring load difference between beginning and maximum depression is large
Solution Approach 1:
The neutral biasing mechanism is divided into multiple independent biasing members (first and second biasing members) connected at different points on the operator. This segmentation allows each biasing member to independently contribute to the overall biasing force, enabling fine adjustment of the total biasing effect while reducing the spring load difference during pedal depression.
Solution Approach 2:
Multiple biasing members are combined to work together on the same operator, with their biasing forces acting in the same direction. The first biasing member connects between the operator and first location, while the second biasing member connects between the operator and second location, merging their effects to achieve the desired biasing force adjustment without excessive complexity.
2Reliability
If multiple biasing members are connected to different points on the operator, then the biasing force can be adjusted and spring load difference is reduced, but the mechanism complexity increases
Solution Approach 1:
Different parts of the operator are assigned different connection points for the biasing members. The first biasing member connects at a first point on the operator while the second biasing member connects at a second point on the operator. This local differentiation allows each biasing member to optimize its load distribution, improving overall reliability and durability by reducing peak loads on any single component.
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 configuration allows for more precise adjustment of the biasing force, enhancing the durability and smooth operation of the neutral biasing mechanism, reducing the difference in spring load and improving the overall mechanism's performance.
Implementation Method 1
a plurality of biasing members configured to bias the operator such that the operator swings in a direction in which the operator presses the cam section
Implementation Method 2
the biasing members connected to the first connection point and the biasing members connected to the second connection point
Data Source
AI summary
A neutral biasing mechanism in a working vehicle includes a cam connected to an operating shaft of a continuously variable transmission and provided with a concave cam section, an operator swingable about an axis of a swing shaft and configured to operate the cam to a neutral orientation by pressing the cam section, and biasing members configured to bias the operator such that the operator swings in a direction in which the operator presses the cam section. Some of the biasing members are connected to a first connection point that is in the operator, and the other biasing members are connected to a second connection point that is in the operator and is different from the first connection point.