Hydraulic Pump Cylinder Block Pressing Force Control
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Solution Overview
Problem
Swash-plate type hydraulic pumps face efficiency issues due to oil leakage between the cylinder block and port plate, and potential abrasion from excessive pressing force during different operational states, which affects fluid pressure systems used in various applications.
Innovation Solution
A fluid pressure pump design that includes a changing means to adjust the pressing force applied to the cylinder block by the cylinder block pressing means based on fluid pressure, allowing for appropriate force application to prevent leakage and abrasion, featuring a configuration where the cylinder block pressing means is operated by fluid pressure and arranged at a distance from the rotational axis to simplify the mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large spring force is applied by the coil spring during the rotation state, then the cylinder block is pushed toward the port plate with excessive force, but this causes the cylinder block to contact the port plate directly and abrade during rotation
Solution Approach 1:
The pressing means transitions from a static spring-based system to a dynamic hydraulic pressing mechanism that adjusts the pressing force based on real-time operational conditions. During rotation state, the hydraulic system reduces or eliminates pressing force to prevent abrasion, while during start action state, it increases pressing force to prevent leakage, making the pressing force adaptive rather than constant
Solution Approach 2:
The pressing force parameter is changed based on the operational state of the pump. During rotation state, the hydraulic pressure in the pressing means is reduced to lower the pressing force, preventing direct contact and abrasion. During start action state, the hydraulic pressure is increased to provide sufficient pressing force to prevent fluid leakage between the cylinder block and port plate
2Object-affected harmful factors
If a small spring force is applied by the coil spring during the start action state, then the cylinder block is not pushed toward the port plate with appropriate force, but this causes fluid leakage between the cylinder block and port plate
Solution Approach 1:
The hydraulic pressing mechanism dynamically adjusts the pressing force based on operational state. During start action state when hydraulic pressure is low, the pressing means automatically increases pressing force to ensure proper sealing between cylinder block and port plate, preventing fluid leakage without requiring a constantly large spring force
Solution Approach 2:
A hydraulic pressing mechanism is introduced to replace or supplement the mechanical spring pressing system. The hydraulic pressing means can provide variable pressing force controlled by hydraulic pressure, allowing sufficient pressing force during start action to prevent leakage, and reduced pressing force during rotation to prevent abrasion
3Device complexity
If a coil spring is used to maintain constant pressing force on the cylinder block, then the structure is simple, but the pressing force cannot be adjusted for different operational states leading to either leakage or abrasion
Solution Approach 1:
A hydraulic pressing mechanism is introduced to replace the simple mechanical spring system. The hydraulic pressing means includes a pressing piston, pressing rod, and hydraulic chamber that can provide adjustable pressing force based on hydraulic pressure, enabling adaptation to different operational states while maintaining reasonable structural complexity
Solution Approach 2:
The pressing mechanism is made dynamic by using hydraulic pressure to adjust the pressing force in real-time according to operational conditions. The hydraulic pressing means can transition between different force levels to match the operational state, making the system adaptive rather than static
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 design effectively prevents fluid leakage and abrasion of the cylinder block and port plate by adjusting the pressing force according to fluid pressure, ensuring stable operation and extending the lifespan of the hydraulic pump.
Implementation Method 1
the hydraulic pressure in the cylinder chamber is increased so that the hydraulic pressure in the cylinder chamber pushes the cylinder block toward the port plate
Implementation Method 2
the coil spring presses the movable member and the spherical surface of the movable member curved-contacts the coupling ring
Data Source
AI summary
A fluid pressure pump and a fluid pressure system in which leakage of fluid and ablation of a cylinder block and a port plate can be prevented by pressing the cylinder block to the port plate with an appropriate pressing force. A hydraulic pump includes a cylinder block that has a cylinder chamber that may be in communication with an oil passage of a port plate and in which a piston is housed; and a cylinder block pressing means imparting, to the cylinder block, a pressing force that presses the cylinder block to the port plate. The cylinder block pressing mechanism has a changing means that changes the force that presses the cylinder block to the port plate.