Axial Piston Machine Storage Element for Pressure Pulsation
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Solution Overview
Problem
Axial piston machines experience pressure pulsation and noise due to uneven piston movement and insufficient pre-compression in cylinder chambers, with existing solutions like pilot slots and hydropneumatic storage elements being space-intensive, costly, and prone to aging.
Innovation Solution
A compact, durable storage element with a movable piston driven by spring and hydraulic forces, connected to the reversing area of the control plate, allowing pre-compression and slow recharging to reduce pressure pulsation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pilot slots or damping holes are installed in the reversing area, then pressure pulsation is reduced, but the volume flow for pressure equalization is taken directly from the high-pressure side, severely limiting the options for reducing pressure pulsation
Solution Approach 1:
The patent introduces a storage element as an intermediary between the cylinder chamber and the high-pressure control opening. This storage element receives hydraulic fluid from the high-pressure side and transfers it to the cylinder chamber, preventing direct connection and the associated pressure pulsation problems while maintaining effective pressure equalization
Solution Approach 2:
The storage element performs preliminary action by pre-compressing the hydraulic fluid before it enters the cylinder chamber. This preliminary compression prepares the fluid at the appropriate pressure level, avoiding sudden pressure increases and reducing pressure pulsation in the high-pressure working line
2Object-affected harmful factors
If hydropneumatic storage devices are used, then pressure equalization is achieved, but the flexible casing or membrane material is subject to aging processes and requires high technical effort
Solution Approach 1:
The patent extracts the problematic flexible membrane from the storage element design and replaces it with a rigid piston. This eliminates the aging issues associated with membrane materials while maintaining the pressure equalization function through the piston's movement between chambers
Solution Approach 2:
The patent employs simple, durable components like a rigid piston and spring instead of complex hydropneumatic systems with aging membranes. These simpler components have longer service lives and require less maintenance, reducing long-term costs and technical complexity
3Object-affected harmful factors
If hydropneumatic storage elements are used, then pressure equalization is achieved, but they take up a relatively large amount of space due to subdivision into oil and gas volumes
Solution Approach 1:
The patent removes the gas volume subdivision inherent in hydropneumatic systems and replaces it with a mechanical spring-based compression system. This eliminates the need for separate oil and gas chambers, significantly reducing the overall volume required for the storage element
Solution Approach 2:
The patent uses a hydraulic piston system with spring force instead of hydropneumatic compression. The spring provides the necessary compression force in a compact manner, avoiding the space requirements of gas-volume-based hydropneumatic systems while achieving the same pressure equalization effect
4Productivity
If the cylinder chamber is connected to the high-pressure side after passing through the reversing area, then volume flows occur due to existing pressure difference, but the reversal area is often not sufficient to compress the pressure to operating pressure
Solution Approach 1:
The storage element performs preliminary compression of the hydraulic fluid in the cylinder chamber before connection to the high-pressure side. This preliminary action ensures the fluid reaches operating pressure during the reversing area, preventing sudden pressure increases and enabling immediate productive volume flow delivery upon high-pressure connection
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 effectively reduces pressure pulsation and noise by pre-compressing the cylinder chamber with a compact, long-lasting storage element, avoiding sudden pressure drops and maintaining consistent pressure, thus enhancing the operational efficiency of axial piston machines.
Implementation Method 1
only the spring force or only the spring force plus a hydraulic force acting on the side of the piston facing away from the cylinder opening
Implementation Method 2
The hydraulic force is created only by the pressure of the high-pressure side on a reduced cross-sectional area of the piston
Implementation Method 3
the pressure in the cylinder chamber can be adjusted without reducing the pressure in the control port carrying high pressure
Data Source
AI summary
The machine has a control plate (1) provided with control openings (2, 3), and reversing regions (4, 5) attached between the control openings. A cylinder drum is arranged relative to the control plate in a rotatable manner. A storage element (10) is connected with the reversing regions. The storage element has a storage volume (15) changed by a spring-loaded piston (12). A piston rear side is loaded either by only a spring force or by the spring force and a hydraulic force, which is produced by an active pressure of a high pressure guiding control opening in a reduced cross sectional surface.