Bent-Axis Machine Pivot Angle Shift for Displacement Volume
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Solution Overview
Problem
Bent-axis machines have a limited maximum pivot angle, restricting their displacement volume and efficiency, especially in applications requiring larger ranges, and existing adjustable yoke designs are costly and complex, making them unsuitable for low-cost traction drives.
Innovation Solution
The minimum pivot angle is shifted by at least 5°, and the maximum pivot angle is extended by the same amount, allowing the entire operating range to be usable without the lower region, effectively increasing the maximum pivot angle to at least 37°, and the control cover is inclined to facilitate this adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the maximum pivot angle is increased to expand displacement volume, then the displacement volume and operational range are improved, but the hydraulic fluid guidance through the pivot cradle fails and fluid escapes into the housing
Solution Approach 1:
The patent changes the geometric parameters of the pivot cradle and control cover, specifically inclining the control cover by angle γ and positioning the valve plate at angle α, to create reliable hydraulic fluid guidance that functions across the extended pivot angle range from -10° to +50°
2Adaptability or versatility
If bent-axis machines with yoke adjustment are used to achieve larger adjustment range (0° to 45°), then the operational range is improved, but the design outlay and monetary expense increase significantly
Solution Approach 1:
The patent achieves extended adjustment range through optimized geometric parameters (pivot angles α and γ, dimensional ratios) in a fixed yoke design, eliminating the need for complex adjustable yoke mechanisms while maintaining cost-effectiveness
Solution Approach 2:
The patent creates a dynamically optimized fixed geometry where the piston drum can pivot through extended angles (-10° to +50°) within a fixed yoke structure, achieving adaptability through parameter optimization rather than mechanical adjustability
3Ease of manufacture
If the minimum pivot angle is set to 0° and maximum to 32-33°, then the machine design is simple and cost-effective, but the displacement volume and efficiency are restricted for applications requiring larger ranges
Solution Approach 1:
The patent changes the operating range parameters from the conventional 0°-33° to -10° to +50°, with optimized angles α and γ, thereby increasing displacement volume while maintaining design simplicity and cost-effectiveness
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 enhancement significantly increases the displacement volume and expands the operational range of bent-axis machines, making them more suitable for traction drives and other applications by eliminating the inefficient lower pivot angle region and extending the usable upper range.
Implementation Method 1
the piston drum with the valve plate can be pivoted by a maximum operating range relative to the drive axis
Implementation Method 2
during the rotational movement the pistons, triggered by the oblique positioning of the piston drum on the inner side of the bend, move deeper into the cylinder, and on the outer side of the bend move out of the cylinder
Implementation Method 3
there arises a partial vacuum in the cylinders that suctions the hydraulic fluid into the cylinder via the pivot cradle
Implementation Method 4
there arises an excess pressure that drives hydraulic fluid out of the cylinder and out of the hydraulic aggregate via the pivot cradle
Data Source
AI summary
A bent-axis machine comprises a housing having a control cover and a piston drum which is rotatably mounted in the housing on a valve plate and which has axial cylinders, each of which receives a piston. An adjustment system includes a pivot cradle via which the piston drum and the valve plate can be pivoted relative to the drive axis about a maximum working range which is delimited by a minimum pivot angle and a maximum pivot angle. The minimum pivot angle of the working range is shifted out of its zero position by at least 5°, and the maximum pivot angle is extended in the same way by at least 5° in order to retain the entire working range about the region left out of the lower region.