Axial Piston Machine Dynamic Swash Plate Control
Solution Overview
Problem
Conventional axial piston machines of the swash plate type suffer from non-uniform piston movements due to the fixed swash plate, leading to rotational irregularities and reduced efficiency, as the phase offset and speed profile of pistons are not uniform, causing mismatched valve control times and inefficient cylinder filling.
Innovation Solution
The axial piston machine addresses this by varying the connections of pistons to the swash plate and adjusting the opening times of inlet and outlet valves to ensure precise alignment with piston positions, compensating for non-uniformities in piston movements, thereby optimizing filling and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the swash plate is fixed to prevent rotation, then the swash plate maintains stable alignment with the cylinder axes, but the piston movements become non-uniform causing rotational irregularities and reduced efficiency
Solution Approach 1:
The invention allows the swash plate to rotate dynamically during operation rather than being fixed. This dynamic rotation compensates for the non-uniform piston movements and eliminates rotational irregularities, thereby improving the overall efficiency of the axial piston machine while maintaining stable functional alignment through controlled motion rather than static fixation
2Ease of manufacture
If the swash plate is fixed in position, then the structure is simpler to manufacture, but the phase offset and speed profile of pistons become non-uniform
Solution Approach 1:
Instead of achieving uniform piston phase offset through precise static manufacturing and fixation, the invention employs dynamic rotation of the swash plate during operation. This dynamic adjustment automatically compensates for manufacturing tolerances and achieves uniform piston speed profiles and phase offsets without requiring extremely high manufacturing precision
Solution Approach 2:
The invention changes the operational parameter of the swash plate from static (fixed position) to dynamic (rotating during operation). This parameter change allows the system to achieve uniform piston movements through operational adjustment rather than relying solely on manufacturing precision, thereby resolving the contradiction between ease of manufacture and movement uniformity
3Device complexity
If conventional valve control times are used, then the valve structure is simple, but the valve opening times do not align with piston positions leading to inefficient cylinder filling
Solution Approach 1:
The invention implements a valve control system that uses feedback from actual piston positions to adjust valve opening times. The control system monitors piston movement in real-time and synchronizes valve operation accordingly, ensuring optimal cylinder filling efficiency while managing complexity through electronic or mechanical feedback mechanisms
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 solution ensures that pistons reach their dead centers after a constant partial rotation of the shaft, allowing for improved cylinder filling and enhanced efficiency by matching valve opening times with piston positions, resulting in more uniform fluid masses across each piston cycle.
Implementation Method 1
the pistons being connected to a swash plate (18) which rests rotatably on a swash plate foot (20)
Implementation Method 2
The movements of the pistons are transmitted to an output shaft via a plate arranged at an angle to the longitudinal axes of the cylinders
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An axial piston machine having a cylinder body (10) in which at least three cylinders (12) are formed, and having pistons (14) movably guided in said cylinders (12), said pistons (14) being connected to a swash plate (18) that rotatably abuts a swash plate foot (20), and a flow of fluid into and out of the cylinders (12) being controlled by means of inlet and outlet valves, is characterized by varying distributions between the connections of the pistons (14) to the swash plate (18) and/or varying opening times for the inlet and/or outlet valves.