Hydrostatic Axial Piston Machine Pulse Reduction via Passive Valve Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Axial piston machines experience technical and control complexity due to the need for complex electrical switching of 3/2-way valves to manage pressure medium pulses during pressure side changes, leading to increased structural and control complexity.
Innovation Solution
A pulse reduction device with a switching valve arrangement that connects high-pressure and low-pressure stores to elongate holes in a passive and reliable manner, reducing the complexity by using 3/2-way or 2/2-way switching valves to control precompression and decompression, and minimizing structural space and drilling complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 3/2-way valves are used for precompression and decompression control, then pressure medium pulses are reduced, but device complexity and control complexity increase
Solution Approach 1:
The switching valve arrangement automatically switches between precompression and decompression modes based on the pressure state of the elongate holes, using the system's own pressure differential to control the valve switching without external control signals
Solution Approach 2:
A common storage element acts as an intermediary between the high-pressure and low-pressure stores, providing a buffer volume that facilitates smooth pressure transitions and reduces pulses while simplifying the valve control logic
2Adaptability or versatility
If electrical switching of 3/2-way valves is implemented, then pressure side change is achieved, but control complexity increases
Solution Approach 1:
The system uses its own operational state (pressure differential between elongate holes) to automatically control the valve switching, eliminating the need for external electrical control systems while maintaining pressure side change capability
Solution Approach 2:
Instead of using electrical signals to control valve switching, the invention inverts the control approach by using the hydraulic pressure state itself to control the valve switching through direct hydraulic actuation
3Object-affected harmful factors
If precompression volume is provided in common storage element, then pressure pulses are minimized, but structural space requirements increase
Solution Approach 1:
The common storage element serves multiple functions simultaneously: it acts as a precompression volume, a decompression volume, and a pressure buffer, maximizing the utility of the structural space required
Solution Approach 2:
The invention merges the precompression and decompression functions into a single common storage element rather than using separate volumes, reducing the total structural space required while maintaining pulse reduction effectiveness
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 reduces technical device and control complexity, enabling efficient pressure side change operations with reduced structural requirements and simplified valve configurations, effectively minimizing pressure medium pulses.
Implementation Method 1
the pressure medium of each cylinder is pre-compressed before it travels over the elongate hole which is acted on with high pressure
Implementation Method 2
Both 3/2-way valves are switched electrically in a cyclical manner. Consequently, inter alia the pressure medium of each cylinder is pre-compressed before it travels over the elongate hole which is acted on with high pressure
Data Source
AI summary
There is disclosed a hydrostatic axial piston machine having a pulse reduction device. This device has a connection location or tap in the transition region in front of the high-pressure-side kidney-like elongate hole of a distributor plate. The connection location or tap is connected by means of one or two hydraulically passively controlled switching valves to a high-pressure store. It is used for precompression and consequently for the pulse reduction. In a development, the distributor plate also has a connection location or tap in the transition region behind the high-pressure-side kidney-like elongate hole. The connection location or tap is connected via one or two hydraulically passively controlled switching valves to a low-pressure store. This is used for the decompression and consequently also for the pulse reduction.