Radial Piston Hydraulic Flow Distribution for Bidirectional Rotation
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Solution Overview
Problem
Conventional radial piston hydraulic devices can only realize unidirectional rotation of the pump or motor, limiting their functionality and efficiency, especially under high-pressure conditions due to inherent clearances and wear issues.
Innovation Solution
A four-quadrant radial piston hydraulic device with two types of valves for flow distribution, incorporating pilot-operated check valves and two-way cartridge valves, along with a reversing slide valve and distribution shaft, enables bidirectional rotation by simplifying control oil-ways and enhancing sealing performance, allowing operation as both hydraulic motor and pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shaft distribution method or end face distribution method is used, then the radial piston hydraulic device can switch between pump state and motor state, but wear caused by the working process cannot be automatically compensated, resulting in a higher risk of leakage under high-pressure conditions
Solution Approach 1:
The patent employs automatic wear compensation mechanisms where the distribution shaft and valves self-adjust to maintain sealing clearance. The wear compensation is achieved through the automatic positioning of the distribution shaft relative to the valve bodies, which compensates for clearance changes without external intervention, thereby maintaining reliability under high-pressure conditions while enabling bidirectional operation
2Device complexity
If conventional radial piston hydraulic device is used, then the structure is relatively simple, but it can only realize unidirectional rotation of the pump or motor
Solution Approach 1:
The patent designs a universal flow distribution system where the distribution shaft with multiple ring grooves and the dual valve configuration (pilot-operated check valve and two-way cartridge valve) enable the same device to function as both hydraulic motor and pump in both clockwise and counter-clockwise directions. This multi-functional design achieves bidirectional rotation capability while maintaining relatively simple structure through the integrated distribution mechanism
3Adaptability or versatility
If two-way rotation is enabled, then the functionality and efficiency of the hydraulic device is improved, but the control oil-ways and valve system becomes more complex
Solution Approach 1:
The patent merges the flow distribution functions into a single integrated distribution shaft with multiple ring grooves (first, second, and third distribution ring grooves) that work in conjunction with the dual valve system. The control oil-ways are integrated into the distribution shaft structure, combining multiple control functions into unified oil-ways that route control pressure to both valves simultaneously, thereby reducing overall system complexity despite enabling two-way rotation
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 solution enables high-pressure operation with bidirectional rotation, improving volumetric efficiency and addressing the limitations of valve flow distribution in conventional devices, thereby enhancing the performance and reliability of radial piston hydraulic systems.
Implementation Method 1
Each of the plunger assemblies is slidably disposed in a corresponding plunger cavity... The pilot-operated check valves and the two-way cartridge valves are connected with the high-pressure oil-ways, the low-pressure oil-ways, and the control oil-ways of the housing
Implementation Method 2
The eccentric spindle is rotatably assembled in the eccentric spindle cavity, and is in transmission connection with the plunger assemblies... When a torque is input, the radial piston hydraulic device works in the pump state... When a high-pressure fluid is input, the radial piston hydraulic device works in the motor state
Data Source
AI summary
A four-quadrant radial piston hydraulic device includes a housing, plunger assemblies, an eccentric spindle rotatably disposed on the housing, pilot-operated check valves one-to-one corresponding to the plunger assemblies, two-way cartridge valves one-to-one corresponding to the plunger assemblies, a distribution shaft and a confluence plate. A reversing slide valve is disposed on the confluence plate. A working method of a four-quadrant radial piston hydraulic device is also provided. When the radial piston hydraulic device is used as a hydraulic motor and a hydraulic pump, it is capable of realizing two-way rotation, which solves a limitation of valve flow distribution in motor application.