Hydraulic Adjusting Device Spring Arrangement Compact Design
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Solution Overview
Problem
The existing adjusting devices for hydraulic axial piston machines are complex in construction and have a significant overall length due to the use of a spring rod that penetrates the control piston, making them costly and inefficient in terms of device technology.
Innovation Solution
The adjusting device features a control piston with a differential face loaded by system pressure and a spring arrangement that loads the actuating piston, allowing for power/moment regulation without the need for a piston rod, resulting in a more compact and technologically simpler design. The spring arrangement includes at least one spring that passes out of engagement after a partial stroke, reducing the spring force applied to the control piston and enabling a hyperbolic pressure-delivery flow characteristic curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a spring rod penetrates the control piston to provide spring force, then the power regulation function is achieved, but the device complexity and overall length increase significantly
Solution Approach 1:
The patent extracts the spring rod from the system by supporting the spring arrangement directly on the actuating piston instead of using a penetrating rod. This removes the complex penetrating connection while maintaining the spring force transmission function, thereby reducing device complexity and overall length.
Solution Approach 2:
The patent merges the spring support function directly onto the actuating piston structure. The spring arrangement is supported on the actuating piston itself, combining the piston structure with the spring support function, eliminating the need for a separate penetrating spring rod.
2Power
If a spring rod penetrates the control piston to provide spring force, then the power regulation function is achieved, but the overall length of the device increases
Solution Approach 1:
The patent extracts the spring rod from the system by supporting the spring arrangement directly on the actuating piston instead of using a penetrating rod. This removes the complex penetrating connection while maintaining the spring force transmission function, thereby reducing device complexity and overall length.
3Manufacturing precision
If two springs are arranged coaxially with one engaging after part stroke to approximate hyperbolic curve, then the pressure-delivery flow characteristic is improved, but the device complexity increases
Solution Approach 1:
The patent employs a dynamic spring arrangement where springs are selectively engaged or disengaged based on the actuating piston position. This dynamic configuration allows the system to approximate the hyperbolic characteristic curve while maintaining simpler overall construction compared to permanently engaged multi-spring systems.
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 reduced device complexity and overall length, enabling efficient power regulation with lower technological outlay, and allows for adjustable characteristic curves through adjustable prestress of the control spring, facilitating simpler and more precise adjustments.
Implementation Method 1
The control piston is loaded in the opposite direction by a spring arrangement having at least one spring, in particular having at least two springs which are supported on the actuating piston
Implementation Method 2
The control piston is configured with a differential face which is loaded by the system pressure and is formed by two sections of the control piston with different diameters
Implementation Method 3
By way of the spring arrangement, the position of the actuating piston is fed back to the control piston as a force
Data Source
AI summary
An adjusting device for an axial piston machine includes an actuating piston that delimits an actuating space configured to be connected to a control oil source or a control oil drain via a control valve. A control piston of the control valve is loaded firstly by a control spring and secondly by a spring arrangement that is also in active engagement with the actuating piston.