Hydraulic Axial Piston Unit With Adjustable Orifice Displacement Control
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Solution Overview
Problem
Existing hydraulic axial piston units face challenges with complex and costly control systems that require precise manufacturing, are bulky, and need continuous maintenance, with components not adaptable to different applications or sizes, leading to inefficiencies and increased space consumption.
Innovation Solution
A hydraulic axial piston unit with a simplified control system using adjustable orifices in bypass lines to set and control displacement volume, reducing the need for complex servo systems and allowing adaptability to different units without disassembly, by controlling the tilt angle of the displacement element through static pressure adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex servo systems with control spools and pressure chambers are used to control displacement volume, then manufacturing precision and operational precision are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the complex servo system components (control spools, pressure chambers, servo pistons) from the hydraulic axial piston unit. Instead of using these complex control mechanisms, the patent employs a simplified control approach using control ports directly on the valve segment that connect to bypass lines with adjustable orifices, thereby reducing device complexity while maintaining control functionality.
Solution Approach 2:
The valve segment is designed with multi-functionality, serving both as the pressure distribution center and as the control center. The control ports are integrated into the valve segment structure, allowing the same component to perform both pressure conveyance and pressure control functions, thereby reducing the need for separate control mechanisms and lowering overall system complexity.
2Manufacturing precision
If specific valve plates, valve segments, and servo units are adapted for each application, then operational precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The valve segment design with integrated control ports provides a universal solution that can be adapted to different applications without requiring completely different components. The control ports can be positioned at different locations on the valve segment to suit various hydraulic axial piston unit configurations, allowing a single basic design to serve multiple purposes while maintaining operational precision.
Solution Approach 2:
The invention introduces adjustable orifices in the bypass lines that can be dynamically adapted to different application requirements. These adjustable orifices allow the system to be fine-tuned for specific operational conditions without requiring custom-manufactured valve segments, thereby reducing manufacturing costs while maintaining the ability to achieve precise operational results.
3Ease of operation
If traditional control systems with multiple components are used, then control functionality is achieved, but device size and space consumption increase
Solution Approach 1:
The invention merges the control functionality into the existing valve segment structure by integrating control ports directly into it. This eliminates the need for separate control mechanisms and reduces the overall number of components, thereby reducing the space required for the hydraulic axial piston unit while maintaining full control functionality.
Solution Approach 2:
The invention removes bulky servo mechanisms and replaces them with a compact control system using adjustable orifices in bypass lines. This extraction of unnecessary components significantly reduces the overall device size and space consumption while preserving the essential control capabilities needed for displacement volume adjustment.
4Manufacturing precision
If components are designed for specific applications, then operational precision is improved, but adaptability to different applications and units is reduced
Solution Approach 1:
The valve segment with integrated control ports serves as a universal component that can be adapted to different hydraulic axial piston unit configurations and applications. The control ports can be positioned at different locations to suit various needs, and the adjustable orifices in the bypass lines can be tuned for different operational conditions, providing both precision and adaptability.
Solution Approach 2:
The adjustable orifices in the bypass lines provide dynamic adaptability, allowing the control system to be adjusted for different applications and operational conditions without changing the basic valve segment design. This enables the same fundamental component design to maintain operational precision across various applications while being versatile enough to adapt to different units and requirements.
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
The solution provides a more cost-effective, compact, and reliable control system that can adapt to various hydraulic axial piston units, reducing vibrations, noise, and extending the unit's lifespan by minimizing pressure peaks and cavitation.
Implementation Method 1
A bypass line is provided connecting one of the control ports with one of the pressure ports or with a pressure compensation chamber. In the bypass line an orifice is arranged capable of continuously and variably opening and closing the bypass line in order to enable an adjustable fluid flow connection between the connected pressure port and the passing cylinder bore via the control port and the bypass line.
Implementation Method 2
The opening of the at least one orifice and its magnitude of opening influences the sum of static pressure forces which are present at the displacement element. The pressures which are present at the ODC control port and at the IDC control port each generate a force which acts on the displacement element via the working pistons.
Implementation Method 3
The pressures which are present at the ODC control port and at the IDC control port each generate a force which acts on the displacement element via the working pistons. The sum of these forces influences the angle of tilt of the displacement element.
Data Source
AI summary
Hydraulic axial piston unit includes a rotatable cylinder block and a valve segment with two pressure ports. An IDC control port and an ODC control port are located on the valve segment in circumferential direction between the circumferential ends of the pressure ports such that a cylinder bore can be fluidly connected to the IDC control port or the ODC control port when the associated working piston is at or close to its inner dead center or outer dead center. The circumferential distance from the control ports to the pressure ports is smaller than the circumferential extension of the cylinder bores. A first and a second bypass line each connecting one of the control ports are provided with an adjustable orifice in the first bypass line, capable of continuously variably opening and closing the first bypass line in order to enable an adjustable fluid flow connection between the connected pressure port and the connected pressure port.