Internal Gear Machine Switching Valves for Leakage Control
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Solution Overview
Problem
Existing inner gear wheel machines for reversing operation experience increased leakage in the hydrostatic hollow wheel bearing during zero crossing or bilateral pressure loading, as the hollow wheel can only seal one side.
Innovation Solution
The implementation of switching valves that control the connection between pressure bags and the hollow wheel bearing, allowing the machine to switch between hydrostatic and hydrodynamic modes, thereby minimizing leakage by ensuring bilateral pressure loading is avoided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrostatic ring gear bearing is used to support the ring gear, then the ring gear can be reliably supported during operation, but leakage increases during zero crossing or bilateral pressure loading because the ring gear can only seal one side
Solution Approach 1:
The system dynamically switches between hydrostatic bearing mode (using pressure pockets for support) and hydrodynamic bearing mode (using the ring gear as bearing surface) based on operating conditions. The switching valves automatically transition the bearing mechanism between these two states, allowing the system to adapt to varying pressure conditions and minimize leakage during zero crossing or bilateral pressure loading while maintaining reliable ring gear support.
2Loss of substance
If switching valves are installed in both connections between pressure pockets and pressure connections, then leakage is minimized by preventing simultaneous pressurization, but device complexity increases
Solution Approach 1:
The switching valves are designed to automatically respond to pressure conditions without external control. Each valve uses the pressure differential across it to control its own state, opening or closing based on whether the ring gear bearing should be in hydrostatic or hydrodynamic mode. This self-regulating mechanism minimizes leakage while avoiding the need for complex external control systems.
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 effectively reduces leakage in the hollow wheel bearing during zero crossing and bilateral pressure loading, ensuring efficient operation without significant leaks, even at high pressures.
Implementation Method 1
By arranging a switching valve in each connection between the pressure pocket and the pressure connection, which opens or closes the connection depending on the pressure
Implementation Method 2
the switching valves are hydraulically spring-loaded two-position valves
Data Source
Figure 1
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AI summary
The application relates to an internal gear machine (10) for reversing duty having a housing (12) with a chamber (14), in the chamber (14) there are disposed an externally toothed pinion (16) and an internally toothed ring gear (18), which mesh with one another, the rotational axes (20, 22) of which run parallel to and spaced apart from one another. The chamber (14) in the housing (12) is axially bounded and is connected via pressure pockets (40, 42) provided in the housing (12) to pressure connections (44, 46) in the internal gear machine (10). According to the invention, a switching valve (60, 62) is arranged in each connection between the pressure pockets (40, 42) and the pressure connections (44, 46) or compression spaces (78, 86), which valve opens or closes the connection.