Axial Piston Control Plate Sealing Ridge Width Variation
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Solution Overview
Problem
Conventional axial piston machines face challenges in optimizing the control plate design to minimize leakage, reduce tilting torque, and accommodate high rotational speeds while maintaining cost-effectiveness, as existing designs often require expensive secondary machining for high surface quality and uniform sealing ridges.
Innovation Solution
A control plate with varying sealing ridge widths, particularly with a second sealing ridge wider in the radial direction at high-pressure openings, allows for inward displacement of control openings, reducing centrifugal forces and tilting torque, and enabling higher rotational speeds, while selectively requiring secondary machining only on specific portions for high surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sealing ridges are formed with constant outside and inside diameter, then manufacturing is simpler, but leakage increases over time due to insufficient sealing quality
Solution Approach 1:
The patent applies local quality by varying the radial width of sealing ridges at different locations. Specifically, the sealing ridge in the region of high-pressure control openings has a greater radial width than sealing ridges in other regions. This localized variation provides enhanced sealing quality where pressure demands it most, while maintaining simpler geometry elsewhere, thus resolving the contradiction between manufacturing simplicity and sealing reliability.
2Stress or pressure
If control openings are positioned farther from the axis of rotation, then pressure distribution is improved, but centrifugal forces increase reducing maximum rotational speed
Solution Approach 1:
The patent applies local quality by creating asymmetric radial widths for sealing ridges based on local pressure requirements. The wider sealing ridge in the high-pressure opening region provides enhanced sealing and pressure management where needed, while narrower ridges in lower-pressure regions reduce overall centrifugal effects, allowing higher rotational speeds while maintaining proper pressure distribution.
3Manufacturing precision
If secondary machining is applied to entire control plate surface, then surface quality and sealing are improved, but manufacturing cost and time increase
Solution Approach 1:
The patent applies local quality by concentrating secondary machining operations only on the sealing ridge regions rather than the entire control plate surface. Since the sealing ridges are the critical areas for preventing leakage, applying machining precision locally to these specific regions achieves the necessary surface quality while significantly reducing manufacturing cost and time compared to machining the whole surface.
4Ease of manufacture
If uniform sealing ridges are used throughout, then manufacturing is easier, but tilting torque compensation is insufficient
Solution Approach 1:
The patent applies asymmetry by designing sealing ridges with different radial widths at different angular positions around the control plate. The asymmetric configuration creates differential pressure distribution that generates a compensating torque to counteract the tilting torque produced during axial piston machine operation. This asymmetric design maintains relative manufacturing simplicity while effectively addressing the tilting torque problem.
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 design enhances strain relief, reduces overloading, and allows for higher rotational speeds in axial piston machines by generating a higher pressure-relief force locally, while minimizing the need for extensive secondary machining, thus improving operational efficiency and cost-effectiveness.
Implementation Method 1
the second sealing ridge is wider in the radial direction in the region of the at least one high-pressure control opening than the first sealing ridge... generating a higher pressure-relief force locally
Implementation Method 2
allows for inward displacement of control openings, reducing centrifugal forces and tilting torque, and enabling higher rotational speeds
Data Source
AI summary
A control plate for an axial piston machine is disclosed. The control plate includes a control face on which at least one kidney-shaped high-pressure control opening extending axially through the control plate and at least one kidney-shaped low-pressure control opening extending axially through the control plate is formed and which defines a first sealing ridge which is formed radially inside the at least one high-pressure control opening and the at least one low-pressure control opening, and a second sealing ridge which is formed radially outside the at least one high-pressure control opening and the at least one low-pressure control opening. In this case, the second sealing ridge is wider in the radial direction, preferably in some portions, than the first sealing ridge. Additionally, an axial piston machine in a swash plate design is disclosed. The axial piston machine includes a control plate which has at least one kidney-shaped high-pressure control opening and at least one kidney-shaped low-pressure control opening, by way of which piston recesses of a cylinder drum which is rotatably mounted in a housing of the axial piston machine can be connected alternately to a high-pressure connection and a low-pressure connection during rotation of the cylinder drum. In this case, a first, radially inner sealing ridge and a second, radially outer sealing ridge, which is designed to be wider in the radial direction, preferably in some portions, than the first sealing ridge, are formed on a contact face between the control plate and the cylinder drum.