Hydraulic Circuit Filling via Cross-Connected Lines
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Solution Overview
Problem
Existing hydraulic circuits for actuating hydraulic working cylinders with one-sided piston rods face issues with incomplete filling of hydraulic fluid, leading to air entry and irregular movements during manual actuation, especially with long hose connections or large cylinder diameters, which affects automatic operation and increases noise.
Innovation Solution
The discharge line of one side of the working cylinder is connected to the replenishing suction line of the opposite side, with a check valve blocking towards the tank and a pressurizing valve opening towards the tank, allowing for efficient transfer and filling of hydraulic fluid between the two sides, ensuring complete filling and minimizing air entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the complete volume of the working cylinder is filled with hydraulic fluid during rapid manual actuation, then the filling speed is improved, but air enters the system through long hose connections or large cylinder diameters
Solution Approach 1:
The discharge line of one side of the working cylinder is connected to the replenishing suction line of the opposite side, allowing hydraulic fluid to be transferred in advance from one chamber to the other before the actuation cycle completes. This preliminary transfer ensures that the cylinder is fully filled even during rapid manual actuation, preventing air entry while maintaining high filling speed
Solution Approach 2:
The patent introduces an intermediary connection between the discharge line and replenishing suction line that acts as a transfer pathway for hydraulic fluid. This intermediary connection allows fluid to move directly between cylinder chambers without passing through the pump, ensuring complete filling while accommodating long hose connections and large cylinder diameters
2Reliability
If air enters the hydraulic system during manual actuation, then the system operation becomes irregular and noise increases, but preventing complete filling requires additional complex components
Solution Approach 1:
The patent merges the discharge line of one cylinder side with the replenishing suction line of the opposite side, combining multiple functions into a single integrated circuit path. This merging ensures complete filling and prevents air entry without requiring separate complex components, thereby maintaining stable operation while minimizing circuit complexity
Solution Approach 2:
The connected discharge and replenishing suction lines serve multiple functions simultaneously: they transfer hydraulic fluid between chambers, ensure complete filling during rapid actuation, and prevent air entry. This multi-functionality achieves reliable stable operation without adding unnecessary circuit complexity
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 complete filling of the hydraulic system, reducing air entry and irregular movements, and allows for independent adjustment of hydraulic medium supply for automatic and emergency operations, enhancing the reliability and stability of the hydraulic circuit.
Implementation Method 1
a check valve blocking in the direction of the tank
Implementation Method 2
a pressurizing valve opening in the direction of the tank
Implementation Method 3
A hydraulic cylinder (1) with a one-sided piston rod (1a) is supplied with a hydraulic medium by a hydraulic system... through a reversible pump (4)
Data Source
AI summary
A hydraulic circuit for actuation of a hydraulic working cylinder (1) having a one-sided piston rod (1a), comprising a reversible pump (4) whereby both sides of said pump are connected via a supply line (5) and a first two-way valve (6) to the tank (7) containing hydraulic medium and through releasable control check valves (8) to the working cylinder (1). Both sides of the arrangement are further connected respectively to a hydraulic closeable valve (21, 31) through a discharge line (20, 30) and also to the tank (7) through a replenishing suction line (22, 32) having a corresponding suction valve (9). Each of said hydraulic closeable valves (21, 31) is controlled by the pump (4) through a second two-way valve (4).The discharge line (20 or 30) of one side of the working cylinder (1) is connected to the respective discharge line (30 or 20) and/or replenishing suction line (32 or 22) at the opposite side of the working cylinder (1), whereby the connected lines are connected to the tank (7) through an arrangement (13) comprising a check valve (14) blocking in the direction of the tank (7) and well as a pressurizing valve (15) opening in the direction of the tank (7) to ensure through simple means the complete filling of the system with hydraulic medium even during manual operation.