Hydrostatic Transmission Neutral Biasing Mechanism
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Solution Overview
Problem
Conventional hydrostatic continuously variable transmissions face challenges in maintaining the biasing force for restoring the swash plate to the neutral position due to spring deformation over time, requiring spring replacement and lacking fine adjustment capabilities.
Innovation Solution
A hydrostatic continuously variable transmission with a neutral biasing mechanism that includes a cam member, pivot arm, and multiple springs, where a variable spring with adjustable biasing force is used, allowing for easy adjustment without replacing springs, and is arranged to prevent interference and facilitate smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring is used in the neutral biasing mechanism, then the structure is simple, but the biasing force cannot be adjusted and requires spring replacement when deformation occurs
Solution Approach 1:
The patent divides the single spring system into multiple springs (first spring and second spring) with different functions. The first spring provides stable biasing force while the second spring allows adjustment, separating the functions of stability and adaptability into distinct components.
Solution Approach 2:
The patent introduces an adjustable mechanism for the second spring that allows the biasing force to be dynamically changed during the service life of the transmission. This enables the system to adapt to wear and deformation without replacing entire spring components.
2Reliability
If spring replacement is required due to deformation, then the biasing force can be restored, but time and effort are consumed and many kinds of springs need to be prepared
Solution Approach 1:
Instead of replacing springs, the patent allows changing the biasing force parameter by adjusting the second spring's configuration or selecting different attachment positions. This transforms a replacement-based maintenance approach into an adjustment-based approach, significantly reducing maintenance time and inventory requirements.
3Ease of operation
If the variable spring and other spring are arranged at separate positions, then interference is prevented and adjustment is facilitated, but the device complexity increases
Solution Approach 1:
The patent spatially segments the spring system by arranging the first and second springs at different positions with separate attachment points. This physical segmentation prevents interference during adjustment while maintaining overall system compactness through careful positioning.
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 easy adjustment of biasing force for restoring the swash plate to the neutral position with a simple structure, reducing the need for frequent spring replacements and improving operational efficiency.
Implementation Method 1
a plurality of springs that are attached so as to be spanned from the pivot arm to the base and bias the pivot arm such that the roller is fitted into the cam portion
Data Source
AI summary
A neutral biasing mechanism in a hydrostatic continuously variable transmission includes a plurality of springs attached so as to be spanned from a pivot arm to a base. The plurality of springs bias the pivot arm such that a roller is fitted into a cam portion. A variable spring configured such that a biasing force thereof can be changed and another spring that is different from the variable spring are provided as the plurality of springs. The variable spring and the other spring are arranged at separate positions in a state where attachment positions thereof in the pivot arm and the base are separate from each other.