Contactless Sensor for Axial Piston Machine Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing axial piston machines with variable displacement, particularly those with tilted bodies, face challenges in precise monitoring of displacement due to factors like the gap between ball joints, angle of tilt, and mechanical sensor connections, leading to potential wear, assembly complexity, and reduced operating duration.
Innovation Solution
A contactless position sensor system comprising two parts, one mounted on a variable tilt body and the other on a fixed body, uses inductive, capacitive, or magnetic sensing to detect the tilt without mechanical connections, reducing wear and assembly complexity while maintaining machine response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical sensors are used to monitor displacement, then measurement can be achieved, but wear occurs and operating duration is reduced
Solution Approach 1:
The patent replaces mechanical sensors with optical sensors to measure the tilt angle of the tilted body. The optical sensor system uses a light source and detector positioned on opposite sides of the tilted body, eliminating mechanical contact between the sensor and the moving components. This substitution of mechanical measurement with optical measurement prevents wear of sensor operating parts while maintaining measurement precision, thereby extending operating duration.
2Measurement precision
If mechanical connections are used to connect sensors to tilted body, then displacement can be monitored, but assembly complexity increases
Solution Approach 1:
The patent extracts the sensor mounting from the mechanical connection system. The optical sensor components (light source and detector) are positioned independently on opposite sides of the tilted body without requiring mechanical attachment to moving parts. This eliminates the need for complex mechanical linkages, levers, and transmissions that would otherwise be required to transmit motion from the tilted body to mechanical sensors, thereby reducing assembly complexity while maintaining measurement capability.
3Measurement precision
If sensors are positioned in high-pressure zones, then direct measurement is possible, but operating duration is reduced
Solution Approach 1:
The patent introduces the tilted body itself as an intermediary element between the high-pressure hydraulic system and the sensor mounting locations. The optical sensors are positioned on opposite sides of the tilted body, which acts as a physical barrier separating the sensor components from the high-pressure fluid zones. This intermediary arrangement allows the sensors to indirectly measure the tilt angle caused by hydraulic pressure changes without being directly exposed to the harsh high-pressure environment, thereby extending their operating duration.
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
The system enhances precision and operating duration by avoiding mechanical contact and high-pressure zone interactions, allowing real-time displacement monitoring without deforming mechanical parts, thus improving the overall monitoring system's reliability and ease of assembly.
Implementation Method 1
uses inductive, capacitive, or magnetic sensing to detect the tilt
Implementation Method 2
uses inductive, capacitive, or magnetic sensing to detect the tilt
Implementation Method 3
uses inductive, capacitive, or magnetic sensing to detect the tilt
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In an axial piston machine with variable displacement with tilted cylinder block, a distributor is coupled with the cylinder block, and a magnetostrictive position sensor has a magnet that is integral with the distributor and a sensor rod that is integral with a fixed body with which the distributor is coupled with the possibility of varying the tilt thereof. The sensor emits a signal that indicates the angular position of the distributor with respect to the fixed body to determine the actual displacement of the machine.