Variable Anticavitation Valve for Hydraulic Motor Cavitation Prevention
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Solution Overview
Problem
Hydraulic motors continue to rotate due to inertia, leading to cavitation issues when the main control valve is closed, which existing systems fail to adequately prevent, resulting in inefficiencies and potential damage.
Innovation Solution
A hydraulic system with a variable anticavitation valve and an electronic control unit that controls the pressure relief valve based on vehicle propulsion mode and hydraulic fluid temperature, ensuring fluid flow from one side of the hydraulic motor to the other, even when the main control valve prevents communication between the pump and motor, thereby preventing cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main control valve is closed to stop fluid communication between the pump and hydraulic motor, then the hydraulic motor rotation is stopped, but cavitation occurs due to inertia forces causing continued rotation
Solution Approach 1:
An anticavitation valve is introduced as an intermediary component between the main control valve and the hydraulic motor. This valve provides a dedicated fluid passage that allows hydraulic fluid to bypass the closed main control valve and reach the hydraulic motor, preventing cavitation while the main control valve remains closed to stop normal operation.
Solution Approach 2:
The fluid control system is segmented into two independent pathways: the main control valve pathway for normal operation control, and the anticavitation valve pathway for cavitation prevention. This segmentation allows each valve to perform its specific function independently without interfering with the other.
2Reliability
If an anticavitation valve is added to prevent cavitation, then cavitation is avoided, but the system complexity increases
Solution Approach 1:
The anticavitation valve is integrated with the main control valve assembly, combining two valves into a single compact unit. This merging reduces space requirements and simplifies installation while maintaining the cavitation prevention function, thereby reducing the overall system complexity despite adding functionality.
3Reliability
If a fixed flow resistance is provided by the anticavitation valve, then cavitation is prevented, but operational versatility is reduced
Solution Approach 1:
The anticavitation valve is designed with variable flow resistance capability, allowing the valve opening to be dynamically adjusted based on operating conditions. This enables the valve to adapt to different flow requirements while maintaining cavitation prevention, thereby preserving operational versatility unlike a fixed orifice design.
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 prevents cavitation, enhances operational efficiency, and allows for controlled deceleration modes, such as 'soft' and 'hard' braking, by managing hydraulic fluid flow and pressure, thus improving the overall performance and reliability of the hydraulic system.
Implementation Method 1
an electronically controlled pressure relief valve for variably controlling the hydraulic fluid flow from the first side to the second side of the hydraulic motor
Data Source
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AI summary
The present invention relates to a hydraulic system (30) for circulating hydraulic fluid via a pump (26) and a hydraulic motor (28). The hydraulic system (30) comprises a main control valve (36) adapted to be located between the pump (26) and the hydraulic motor (28) as seen in a direction of flow from the pump (26) to the hydraulic motor (28). The hydraulic system (30) further comprises an anticavitation valve (52) adapted to be located between the main control valve (36) and the hydraulic motor (28) as seen in a direction of flow from the pump (26) to the hydraulic motor (28). The anticavitation valve (52) is arranged such that when the main control valve (36) assumes a condition preventing fluid communication between the pump (26) and the hydraulic motor (28), hydraulic fluid may flow from a first side (70) to a second side (74) of the hydraulic motor (28) via the anticavitation valve (52). According to the present invention, the anticavitation valve (52) comprises a variable valve assembly (81) for variably controlling the hydraulic fluid flow from the first side (70) to the second side (74) of the hydraulic motor (28).