Digital Variable Hydraulic Motor Radial Piston Pump

Abstract

Digital variable hydraulic motor radial piston pump, the motor rotor (15) is shrunk on the hollow composite shaft (8), supported by bearings (19, 27) inside the casing (12), and sealing rings ( 20), sealing ring (26) and lip-shaped sealing ring (25); the ball plunger (5) and the sliding shoe (6) are rolled into one and connected by a ball joint, the axis of the ball plunger (5) and the hollow The axis of the compound shaft (8) is vertical, and the sliding shoe (6) is in contact with the eccentric disc (8c) on the hollow compound shaft (8). When the eccentric disc (8c) rotates with the hollow compound shaft (8), the drive ball The head plunger (5) and the sliding shoe (6) move in the corresponding plunger hole (10c) opened on the pump body (10), and reset under the action of the return spring (4); the digital switch oil suction check valve ( 1) Its axis coincides with the axis of the plunger hole (10c), and the oil discharge check valve (3) is arranged vertically to the electromagnetic switch oil suction check valve (1).

Description

technical field [0001] The invention relates to electro-hydraulic integrated hydraulic power unit technology, in particular to a digital variable hydraulic motor radial plunger pump. Background technique [0002] The electro-hydraulic integrated hydraulic power unit is a new development direction of hydraulic power equipment, and it has developed rapidly in the international and domestic markets due to its huge advantages such as low noise, high efficiency, compact structure, and man-machine friendliness. At present, the technology mainly focuses on the integration of quantitative hydraulic pump and electric motor, such as the hydraulic motor vane pump of Eaton in the United States, the electro-hydraulic integrated helical gear pump of Rexroth in Germany, and the air gap non-immersed hydraulic motor vane pump developed by Lanzhou University of Technology, etc. . In occasions with high working pressure or even ultra-high pressure and strict requirements on axial dimensions, ...

AI Technical Summary

Problems solved by technology

[0003] Summarize the above technical deficiencies: 1. There are many parts / components involved, and the structure is relatively complicated; 2. The motor is cooled by air cooling, which has a lot of noise, or water-cooled / oil-cooled motors, but additional cooling systems are required, which increases the complexity of the system 3. There is insufficient oil absorption, especially at high speeds, resulting in low volumetric efficiency and low overall efficiency

4. The friction pair between the rotor and the plunger is not lubricated by oil, and the friction and wear are relatively large; 5. The bearing can only be sealed by grease, and its life is limited; 6. There is external leakage at the shaft seal, which may cause potential risks of polluting the environment; 7. Connection with the motor Couplings are still required, the axial dimension is still large, and the overall volume and weight are large

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