Hydraulic Module Yoke Pivot Pin Design
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Solution Overview
Problem
Hydraulic modules for hydrostatic-mechanical transmissions face challenges in achieving precise adjustment of the yoke due to tolerances, making exact control of volume flow difficult.
Innovation Solution
A hydraulic module design featuring a yoke that pivots about a pivot axis, with a pin connected to a piston to enable precise control of the inclined-axis drive systems, minimizing friction through a ball-shaped pin engagement and utilizing a plate to hold the bearings and piston, allowing for direct coaxial extension and precise displacement angle measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two servo pistons are used to act upon the yoke for adjustment, then the yoke can be adjusted, but exact adjustment and feedback are difficult due to tolerances
Solution Approach 1:
The invention extracts the feedback function from a complex servo system with two pistons and integrates it directly into the yoke structure through the pin connection. The pin serves dual purposes: mechanical actuation and position feedback, eliminating the need for separate feedback mechanisms.
Solution Approach 2:
The pin is designed as a multi-functional component that simultaneously acts as a mechanical connector for actuation and a feedback element for position sensing. This universal component performs multiple functions that would otherwise require separate elements.
2Device complexity
If a pin connected to a piston is used to pivot the yoke, then the structure is simplified, but frictional resistance may increase
Solution Approach 1:
The pin engagement with the piston incorporates a ball-shaped end that engages in an opening, creating a spherical contact interface. This curvature reduces frictional resistance compared to flat or point contacts, allowing smooth pivoting motion while maintaining structural simplicity.
3Measurement precision
If the piston is positioned between the bearings, then direct coaxial extension enables simple displacement angle measurement, but the space requirement increases
Solution Approach 1:
The invention merges the piston positioning function with the measurement function by placing the piston in direct coaxial alignment with the yoke pivot axis. This integration allows the piston's linear displacement to directly indicate the yoke's angular position, combining actuation and measurement in one arrangement.
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 accurate control of the stroke volume without additional structural space, ensuring precise adjustment and feedback for improved performance.
Implementation Method 1
The pin is in active connection with a piston so that translational movement of the piston moves the pin in such manner that the yoke is caused to pivot about its pivot axis
Implementation Method 2
The end of the pin that engages in the piston is preferably ball-shaped, since this minimizes the frictional resistance between the piston and the pin
Data Source
AI summary
A hydraulic module with two inclined-axis drive systems. The hydraulic module comprises a yoke (1) which, by virtue of a pin (5) that is in active connection with a piston (6), is pivoted about a horizontal pivot axis (4) so as to adjust the stroke volume of the two inclined-axis drive systems.