Swash Plate Axial Piston Joint for Compact High-Force Adjustment
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Solution Overview
Problem
Existing hydrostatic axial piston machines face challenges with complex and costly adjusting devices that require significant installation space and have limited pivotability and force levels for adjusting the swash plate.
Innovation Solution
A simple and inexpensive adjusting device is implemented using a movable swivel joint with a spherical joint body and a corresponding receptacle, allowing for linear contact only, which simplifies the articulated connection between the adjusting piston and the swash plate, enabling easy assembly and reduced space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a complex adjusting device with multiple components is used to adjust the swash plate, then the adjustment force and pivotability are improved, but the device complexity and installation space requirements increase
Solution Approach 1:
The patent combines the adjusting piston and swivel joint into a single integrated component. The adjusting piston itself forms the swivel joint through a spherical surface that contacts the swash plate, eliminating the need for separate coupling rods and swivel joint components. This merging reduces device complexity while maintaining adjustment force capability.
Solution Approach 2:
The patent extracts and eliminates unnecessary intermediate components from the adjusting mechanism. By having the adjusting piston directly contact the swash plate through its spherical surface, it removes the coupling rod and associated swivel joints that were present in conventional designs, simplifying the overall structure.
2Adaptability or versatility
If a complex articulated connection with coupling rods and swivel joints is used, then the swash plate pivotability is improved, but the installation space and manufacturing cost increase
Solution Approach 1:
The adjusting piston is designed with a spherical surface that directly contacts the swash plate, merging the functions of the adjusting piston and swivel joint into one component. This eliminates the need for separate coupling rods and reduces the installation space required for the adjusting mechanism.
Solution Approach 2:
Instead of using a coupling rod connected to the piston that pivots against the swash plate, the invention inverts the approach by making the piston itself the pivoting element through its spherical surface. This direct contact approach reduces the number of components and space requirements.
3Force
If surface contact between spherical bushing and retaining ring is used, then the load distribution is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the spherical bushing and retaining ring components from the design. The adjusting piston's spherical surface directly contacts the swash plate, eliminating the need for intermediate spherical bushings and retaining rings, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The spherical surface for load bearing is integrated directly into the adjusting piston body, merging the functions of the piston, spherical bushing, and retaining ring into a single component. This reduces the number of parts and simplifies manufacturing while maintaining load distribution capabilities.
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 results in a cost-effective and space-efficient adjusting mechanism that provides improved pivotability and force distribution for adjusting the swash plate, enhancing the operational efficiency of the hydrostatic axial piston machine.
Implementation Method 1
a double-acting adjusting piston, which can be moved longitudinally in the adjusting cylinder... the inflow and the outflow of pressure fluid is controlled by means of a control valve
Implementation Method 2
the joint between the adjusting piston and the swash plate is a movable swivel joint, which comprises a joint body receptacle on one part and a joint body on the other part... the joint body is closely guided in the joint body receptacle... can be rotated about an axis of rotation running parallel to the pivot axis
Data Source
AI summary
An axial piston machine has a swash plate and an adjusting device having an adjusting cylinder and a double-acting adjusting piston which is longitudinally movable in the adjusting cylinder and includes a piston and a piston rod, which is fixedly connected to the piston and is articulated to the swash plate. The joint between the adjusting piston and the swash plate is a movable swivel joint having a joint body receptacle on one part and a joint body on the other part of the adjusting piston and the swash plate. The joint body is closely guided in the joint body receptacle in the direction of movement of the adjusting piston, is rotatable about an axis of rotation running parallel to the pivot axis of the swashplate, and is movable with a directional component perpendicular to the direction of movement of the adjusting piston and perpendicular to the axis of rotation.