Hydrostatic Axial Piston Engine Constant Velocity Joint
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Solution Overview
Problem
Axial piston machines with a bent-axis design face limitations in maximum permissible speed, synchronous rotation of the cylinder drum, and universal application due to high construction costs and complex production processes of existing constant velocity joints, as well as limitations in torque transmission and component loading.
Innovation Solution
A spherical guide is formed between the cylinder drum and the drive shaft, allowing the drive shaft to pass through the cylinder drum, and a cone-beam half-roller joint is used as a constant velocity joint to enable synchronous rotation and torque transmission with reduced production costs and increased flexibility in application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a constant velocity joint is used to drive the cylinder drum for synchronous rotation, then the rotational synchronicity is improved, but the construction costs and production complexity increase due to complex raceways requiring deep hardening
Solution Approach 1:
The patent employs spherical sections on both the drive shaft and cylinder drum to create a spherical guide structure. This curvature-based design replaces the complex grooved raceways of traditional constant velocity joints with simpler spherical surfaces that naturally guide the motion, reducing manufacturing complexity while maintaining rotational synchronicity through the geometric constraints of the spherical interface.
Solution Approach 2:
The spherical guide acts as an intermediary element between the drive shaft and cylinder drum. Instead of directly coupling them with complex constant velocity joint mechanisms, the spherical guide mediates the motion transfer, enabling synchronous rotation through its geometric properties while simplifying the overall structure and reducing the need for deep hardening of complex raceways.
2Adaptability or versatility
If the drive shaft is passed through the axial piston machine for universal application, then the adaptability is improved, but the structural complexity increases
Solution Approach 1:
The drive shaft is designed as a hollow shaft that can be passed through the entire axial piston machine, enabling universal application scenarios where torque can be transmitted through the machine or where additional components can be mounted on the drive shaft. This through-drive design provides multi-functionality without requiring separate mounting structures.
Solution Approach 2:
The hollow drive shaft creates a nested structure where the drive shaft itself serves as a conduit or mounting structure for other components. The spherical guide is positioned within the hollow drive shaft, creating a nested arrangement that simplifies the overall structure by integrating multiple functions into a single through-going component.
3Device complexity
If connecting rods or conical pistons are used to entrain the cylinder drum, then the structure is simplified, but the rotation becomes non-uniform due to limited number of components
Solution Approach 1:
The spherical guide uses curved spherical surfaces instead of straight connecting rods or conical surfaces. The spherical geometry naturally distributes the force transmission more uniformly around the rotation, and the spherical sections can be positioned at multiple locations to ensure uniform entrainment of the cylinder drum while maintaining structural simplicity.
4Adaptability or versatility
If the cylinder drum is swiveled back to smaller displacement volume, then the adjustability is improved, but loose play occurs leading to high component loads
Solution Approach 1:
The spherical guide maintains continuous contact between the drive shaft and cylinder drum through its curved spherical surfaces. This geometric constraint prevents loose play even when the cylinder drum is swiveled back to smaller displacement volumes, as the spherical sections naturally maintain engagement without requiring additional locking or support mechanisms.
Data Source
AI summary
The invention relates to a hydrostatic axial piston machine (1) in a skewed-axis design with a drive shaft (4) rotatably arranged about an axis of rotation (Rt), which is provided with a drive flange (3), and a cylinder drum (7) rotatably arranged about an axis of rotation (Rz), wherein the cylinder drum (7) is provided with several piston recesses (8) arranged concentrically to the axis of rotation (Rz) of the cylinder drum (7), in each of which a piston (10) is arranged to be longitudinally displaceable, wherein the pistons (10) are pivotally attached to the drive flange (3), and wherein a drive joint (30) designed as a constant velocity joint is arranged between the drive shaft (4) and the cylinder drum (7) for rotationally synchronous rotation of the cylinder drum (7) and the drive shaft (4).The drive joint (30) and the cylinder drum (7) are provided with a longitudinal recess (11) arranged concentrically to the axis of rotation (Rz) of the cylinder drum (7), through which the drive shaft (4) provided with the drive flange (3) extends through the cylinder drum (7), wherein a torque transmission to a cylinder drum-side end of the axial piston machine (1) is provided in the area of the drive shaft (4).