Hydrostatic Axial Piston Machine Swashplate Pivoting Range
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Solution Overview
Problem
Conventional axial piston machines with electroproportional control are limited in pivoting range, unable to pivot through +100% to −100%, due to the spatial arrangement of the cartridge, actuating cylinder, and actuating pressure chamber, which restricts the movement of the actuating piston and swashplate.
Innovation Solution
The axial piston machine features a swashplate with an actuating piston that can be displaced in an actuating cylinder, where the actuating pressure passage is arranged directly inside the cartridge, eliminating the need for an axial bore in the cartridge and allowing the actuating piston to be retracted further, thereby increasing the pivoting angle to −100%. This design includes an electroproportional control valve operated by an electric solenoid, with ports and passages optimized for reduced length and production simplicity, and a feedback spring system for enhanced pivotability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cartridge is screwed into the housing obliquely at less than 30 degrees and the actuating pressure chamber is arranged in spatial series with the cartridge, then the cartridge limits the movement of the actuating piston, but the pivoting range is restricted and cannot extend from +100% to −100%
Solution Approach 1:
The actuating pressure passage is reoriented to extend radially outward from the actuating pressure port through the cartridge body to the actuating pressure chamber, rather than axially. This dimensional change allows the passage to bypass the axial length constraint imposed by the cartridge's oblique mounting, enabling full pivoting range from +100% to −100% while maintaining the compact spatial series arrangement.
2Ease of manufacture
If an axial bore is provided in the cartridge for the actuating pressure passage, then the passage can be formed, but the axial overall length of the cartridge increases
Solution Approach 1:
Instead of forming the actuating pressure passage as an axial bore that would increase the cartridge's axial length, the passage is designed to extend radially outward from the actuating pressure port through the cartridge body. This radial configuration allows the passage to be formed without adding axial length, enabling the actuating piston to be retracted further and increasing the pivoting angle to −100%.
3Ease of operation
If the actuating piston is retracted further into the actuating cylinder, then the pivoting angle is increased, but the cartridge must be shortened
Solution Approach 1:
The actuating pressure passage is configured to extend radially outward from the actuating pressure port through the cartridge body to the actuating pressure chamber, rather than axially. This radial dimension allows the cartridge to be shortened in the axial direction, enabling the actuating piston to be retracted further and increasing the pivoting angle to −100% without requiring a longer cartridge.
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 enables the axial piston machine to pivot through the full range of +100% to −100%, reducing production costs and complexity while maintaining electroproportional control of the rotational speed, facilitating the use as a high-performance fan motor capable of blowing out contaminants effectively.
Implementation Method 1
The control valve is operated by an electric solenoid
Implementation Method 2
an actuating piston which can be displaced in an actuating cylinder, by means of which an inclination of the swashplate can be adjusted
Implementation Method 3
a swashplate to which is coupled an actuating piston which can be displaced in an actuating cylinder
Data Source
AI summary
A hydrostatic axial piston machine has a housing. In the housing of the hydrostatic axial piston machine, an actuating pressure cylinder is formed at an angle to the drive shaft. A control valve is inserted into the actuating pressure cylinder in a cartridge type of design. In order to enable maximum movement of an actuating piston in the direction toward the control valve, the cartridge is of shortened design. To this end, an actuating pressure port, which is arranged between a high-pressure port and a low-pressure port, and an actuating pressure passage are arranged completely inside the cartridge.