Hydrostatic Piston Torque Regulation via Springless Valve Slide
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Solution Overview
Problem
Existing hydrostatic axial piston machines have complex and lengthy adjustment devices due to the inclusion of a spring rod, which complicates the structure and increases the apparatus outlay for torque regulation.
Innovation Solution
An adjustment device with a valve slide and feedback springs that approximates a hyperbolic torque characteristic curve using multiple straight lines, eliminating the need for a spring rod by providing a compensation surface that balances the adjustment pressure, allowing for a more compact and simplified design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring rod is included in the adjustment device, then the torque regulation function is achieved, but the structural length and device complexity increase
Solution Approach 1:
The patent removes the spring rod from the adjustment device, extracting the problematic component that caused increased structural length and complexity. The torque regulation function is maintained through alternative means using feedback springs that act directly on the valve slide without requiring a spring rod extension.
Solution Approach 2:
The valve slide is designed to serve multiple functions: it controls the regulation valve operation and simultaneously provides a compensation surface that balances adjustment pressure. This multi-functionality eliminates the need for separate components like the spring rod, reducing overall device complexity while maintaining regulation capability.
2Reliability
If a spring rod is included in the adjustment device, then the torque regulation function is achieved, but the apparatus outlay increases
Solution Approach 1:
The spring rod is completely removed from the device architecture. The patent achieves torque regulation without this component by using feedback springs that directly engage with the valve slide, thereby reducing the number of parts and simplifying the overall apparatus.
Solution Approach 2:
The compensation surface is integrated into the valve slide structure itself, combining the pressure balancing function with the existing valve slide component. This merging eliminates the need for separate pressure balancing components, reducing apparatus outlay while maintaining the torque regulation function.
3Measurement precision
If multiple feedback springs are used to approximate the hyperbolic torque characteristic curve, then the regulation accuracy is improved, but the device complexity increases
Solution Approach 1:
The torque characteristic curve approximation is achieved by segmenting the feedback force into multiple discrete springs with different characteristics. Each feedback spring contributes to shaping the overall hyperbolic curve, allowing accurate regulation while keeping individual spring components simple and manageable.
Solution Approach 2:
The feedback springs serve dual purposes: they provide the restoring force for the valve slide and simultaneously shape the torque characteristic curve through their combined mechanical properties. This multi-functionality achieves high regulation accuracy without adding excessive complexity, as the same components perform multiple roles.
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 solution reduces the structural length and apparatus outlay, improving the accuracy of power regulation while maintaining effective torque control, even with lower adjustment pressures.
Implementation Method 1
at least one feedback spring which exerts on the valve slide a feedback force which is dependent on the position of the adjustment piston
Implementation Method 2
pressure medium flows into the adjustment chamber or out of the adjustment chamber
Data Source
AI summary
An adjustment device for regulating torque of a hydrostatic piston machine includes a piston delimiting a chamber, a regulation valve, feedback and regulation springs, and a member. The valve has a displaceable slide to enable pressure medium to flow into or out of the chamber, a measurement surface acted on by pressure from the piston machine, and a bore open to the chamber, a side facing the chamber acted on by a chamber pressure in a first direction. The feedback spring exerts force on the slide in the first direction, depending on a position of the piston. The regulation spring exerts force on the slide in a second direction opposite the first direction. The member has a surface as large as the side of the bore such that the chamber pressure exerts force on the slide in the second direction.