Hydrostatic Axial Piston Seal Arrangement Reducing Assembly Complexity
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Solution Overview
Problem
Existing axial piston machines have complex technical and assembly requirements due to the presence of three seals delimiting the pressing pressure chamber, increasing device and assembly complexity.
Innovation Solution
A hydrostatic axial piston machine with a simplified pressing pressure chamber, where the chamber is delimited by the drive shaft and cylinder drum, and only two seals are used, with the swash-plate-side seal arranged directly between the drive shaft and cylinder drum, eliminating the need for a third seal. The distributor-plate-side seal is positioned at the retraction ball or tooth arrangement, and the sealing diameters are designed to avoid interference with the tooth arrangement during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three seals are used to delimit the pressing pressure chamber, then the sealing effectiveness is improved, but the device complexity and assembly complexity increase
Solution Approach 1:
The patent combines the functions of multiple seals into a single seal arrangement. The seal is configured to simultaneously seal against both the drive shaft and the cylinder drum, merging what would traditionally require separate sealing components into one integrated solution, thereby reducing device complexity while maintaining sealing effectiveness
Solution Approach 2:
The single seal is designed to perform multiple sealing functions: it seals the pressing pressure chamber against the drive shaft and simultaneously seals against the cylinder drum. This multi-functional seal replaces what would traditionally require multiple separate seals, reducing assembly complexity while ensuring comprehensive sealing
2Reliability
If three seals are used to delimit the pressing pressure chamber, then the sealing effectiveness is improved, but the assembly complexity increases
Solution Approach 1:
By merging the sealing functions into a single seal component that interacts with both the drive shaft and cylinder drum, the patent reduces the number of assembly steps required. Instead of installing and positioning multiple separate seals, only one seal needs to be assembled, significantly reducing assembly complexity
Solution Approach 2:
The patent extracts and eliminates the unnecessary third seal from the traditional three-seal configuration. By identifying that a single properly positioned seal can achieve the same sealing effect, the design removes redundant components, simplifying both manufacturing and assembly processes
3Volume of moving object
If the seal is arranged close to the tooth arrangement, then the pressing pressure chamber is compact, but the risk of damage during assembly increases
Solution Approach 1:
The seal is positioned at a specific location where it can effectively seal the pressing pressure chamber while maintaining sufficient clearance from the tooth arrangement. This localized positioning optimization ensures the seal is close enough to maintain compact chamber volume but far enough to avoid damage during assembly operations
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 configuration reduces the complexity of the device and assembly by eliminating the third seal, preventing damage during assembly and simplifying the pressing pressure chamber, while maintaining effective pressure medium connection and sealing.
Implementation Method 1
the cylinder drum is tensioned by means of a hydrostatic pressing device against a stationary distributor plate
Implementation Method 2
The pressing pressure chamber is delimited by the drive shaft and the cylinder drum and is further delimited by a swash-plate-side seal and a distributor-plate-side seal
Data Source
AI summary
A hydrostatic axial piston machine includes a pressing pressure chamber for the cylinder drum which is supplied with pressing pressure from a circular-arc-like elongate hole of a distributor plate or from a plurality of connection channels of the cylinder drum. The pressing pressure chamber is delimited radially outwardly by the cylinder drum and radially inwardly by the drive shaft. The pressing pressure chamber is delimited axially at both sides by seals which are both arranged between the radially inner rotating drive shaft and a radially outer stationary component. The radially outer component may be the cylinder drum or, in the case of the distributor-plate-side seal, also a gap seal between the drive shaft and a bearing bush of the distributor plate. Both seals are arranged at the distributor plate side with respect to a tooth arrangement or a retraction ball.