Shared Precompression Volume for Hydrostatic Piston Machine
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Solution Overview
Problem
Existing hydrostatic axial piston machines with multiple driving mechanisms face challenges in minimizing volume flow pulsation and noise levels while maintaining low costs and installation space efficiency, particularly when using dedicated precompression volumes for each mechanism.
Innovation Solution
A hydrostatic axial piston machine unit design where two driving mechanisms share a single precompression volume, allowing pressure fluid to flow to both sets of displacement spaces before they open to the high-pressure control port, reducing the need for separate precompression volumes and minimizing installation space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If each driving mechanism is assigned a dedicated precompression volume, then volume flow pulsation and noise levels are minimized, but installation space and device complexity increase
Solution Approach 1:
The patent combines two separate precompression volumes into a single shared precompression volume that serves both driving mechanisms. The control plate includes a single precompression volume with first and second outlets that can supply pressure medium to either the first or second driving mechanism as needed, eliminating the need for separate precompression volumes for each mechanism while maintaining effective pulsation control.
Solution Approach 2:
The shared precompression volume is designed to perform multiple functions: it can supply pressure medium to the first driving mechanism through the first outlet, supply pressure medium to the second driving mechanism through the second outlet, and maintain pressure balance for both mechanisms. This multi-functional design reduces the overall number of components and installation space required.
2Object-affected harmful factors
If each driving mechanism is assigned a dedicated precompression volume, then volume flow pulsation and noise levels are minimized, but device complexity and costs increase
Solution Approach 1:
The patent merges the precompression volume functionality into a single shared component within the control plate, reducing the total number of parts from two separate precompression volumes to one. This consolidation simplifies the overall device structure, reduces manufacturing complexity, and lowers costs while maintaining the pulsation control function for both driving mechanisms.
Solution Approach 2:
The shared precompression volume with multiple outlets is designed to serve both driving mechanisms universally, replacing what would otherwise require two dedicated precompression volumes. This multi-functional design reduces device complexity by eliminating redundant components while preserving the ability to control volume flow pulsation and noise levels.
3Volume of stationary object
If a shared precompression volume is used for both driving mechanisms, then installation space and costs are reduced, but the complexity of pressure control increases
Solution Approach 1:
The control plate acts as an intermediary structure that manages the shared precompression volume and its distribution to both driving mechanisms. The control plate includes the precompression volume, first outlet, and second outlet as integrated components, providing a centralized control architecture that simplifies pressure management despite the shared resource configuration.
Solution Approach 2:
While the precompression volume is shared, the control system is segmented into distinct outlets and control regions: the first outlet serves the first driving mechanism and the second outlet serves the second driving mechanism. This segmentation within the unified precompression volume allows independent control of pressure distribution to each mechanism, managing complexity through functional separation.
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 design achieves low volume flow pulsation and noise levels with reduced costs and installation space, effectively addressing the limitations of dedicated precompression volumes by utilizing a shared precompression volume for both driving mechanisms.
Implementation Method 1
A fluid volume acting as a precompression volume (PCV) for a changeover region, in which the displacement pistons reverse their direction of motion. The term 'fluid volume' is taken to mean a cavity which is filled or is to be filled with a liquid pressure medium, e.g. hydraulic oil, and in which a change in pressure is associated with an inflow or outflow of pressure medium, if only because of the compressibility of the pressure medium.
Implementation Method 2
The PCV, in turn, is connected to the high-pressure control port via a slide valve and a restrictor, thereby enabling the PCV to be supplied with high pressure and to be charged slowly via the restrictor when the slide valve is open.
Data Source
AI summary
A hydrostatic piston machine unit, which is in particular designed as a hydrostatic axial piston machine unit, comprises at least two driving mechanisms that can be driven synchronously and have displacement pistons which each perform a reciprocating motion in operation and are provided for delivery into a common pressure line. The hydrostatic piston machine unit has a jointly assigned precompression volume for the at least two driving mechanisms.