Hydrostatic Axial Piston Pump Cylinder Drum Tilting Control
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Solution Overview
Problem
Axial piston machines experience tilting issues due to operational forces and moments, leading to undesirable leakage and reduced volumetric efficiency, and existing solutions like distributed segments increase manufacturing costs and wear.
Innovation Solution
An axial piston machine with a hydrostatic main relief field on the distributor plate, featuring a relief surface that counteracts tilting by concentrating asymmetry at a crucial location, reducing friction loss and wear, and optionally incorporating hydrostatic additional relief fields for adjustable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple segments are distributed uniformly at the edge of the cylinder drum to counteract tilting, then the risk of tilting over the tilting point is reduced, but the manufacturing cost increases and wear and friction loss increase
Solution Approach 1:
The relief field is divided into multiple sectors around the circumference of the distributor plate, with at least one sector having a different relief field strength than others. This segmented approach allows asymmetric distribution of relief forces to counteract tilting moments while maintaining manufacturing feasibility through modular design.
Solution Approach 2:
Different regions of the distributor plate are assigned different relief field strengths locally. The sector opposing the tilting point has enhanced relief field strength to provide counteracting force, while other sectors have standard or reduced strength. This local differentiation optimizes tilting counteraction where needed without uniformly increasing complexity everywhere.
2Stability of the object's composition
If multiple segments are distributed uniformly at the edge of the cylinder drum to counteract tilting, then the risk of tilting over the tilting point is reduced, but wear and friction loss increase
Solution Approach 1:
The relief field is divided into multiple sectors around the circumference of the distributor plate, with at least one sector having a different relief field strength than others. This segmented approach allows asymmetric distribution of relief forces to counteract tilting moments while maintaining manufacturing feasibility through modular design.
Solution Approach 2:
Different regions of the distributor plate are assigned different relief field strengths locally. The sector opposing the tilting point has enhanced relief field strength to provide counteracting force, while other sectors have standard or reduced strength. This local differentiation optimizes tilting counteraction where needed without uniformly increasing complexity everywhere.
3Stability of the object's composition
If a hydrostatic additional relief field is added to counteract tilting, then tilting is reduced, but the device complexity increases
Solution Approach 1:
The distributor plate serves multiple functions: it acts as the high-pressure kidney-shaped aperture, the low-pressure kidney-shaped aperture, the main relief field, and the additional asymmetric relief field all in one component. This multi-functionality reduces device complexity by eliminating the need for separate segments or additional components.
Solution Approach 2:
The additional asymmetric relief field is merged with the main relief field on the same distributor plate, with both fields working together to counteract tilting. The relief fields are integrated into a single structural element rather than being separate components, simplifying the overall device architecture.
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 minimizes tilting and associated friction and wear, enhancing the machine's efficiency and reducing manufacturing costs by concentrating the relief force at the tilting point, thereby improving the axial piston machine's performance.
Implementation Method 1
a hydrostatic main relief field which extends into both quadrants is provided on the distributor plate directly adjacent to the high-pressure kidney-shaped aperture
Implementation Method 2
a hydrostatic relief is known which is arranged between the cylinder drum and the distributor plate in or on the contact surfaces thereof
Data Source
AI summary
A hydrostatic axial piston pump of swashplate construction, which is also configured to be operated as a motor, has a stationary control plate against which a rotating cylinder drum is tensioned. During operation, a tilting tendency of the cylinder drum arises in the direction of that quadrant of the control plate which is operatively connected to the first part of the displacement stroke of the pistons. The control plate has a supporting device configured for the cylinder drum. The supporting device is arranged adjacent to an outer edge of the control plate in the first quadrant thereof. The supporting device is configured to be formed by a hydrostatically relieved additional field.