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Design Idea and Practical Application of Hydraulic Gear Oil Pump
Release time:
2020-01-04
The hydraulic gear oil pump has radial force imbalance, and the deformation of the gear shaft is biased towards the low pressure area of the pump body, which may cause scraping and boring phenomenon, and at the same time make the floating of the shaft sleeve worse and reduce the working life of the bearing. The method of increasing the high-pressure drainage groove is used in the design of the side plate to increase the range of the high-pressure oil area of the gear pump.
Taking into account the actual working conditions of the hydraulic gear oil pump, the design of the floating combination sleeve should be able to reduce the radial force of the gear pump, reduce noise, and provide axial compensation. The specific design ideas are as follows:
(1) The hydraulic pressing force should be greater than the hydraulic separating force, but it should not be too large. The actual pressing force is 1.2 times the separating force;
(2) The working face of the combined shaft sleeve and gear has unloading grooves in the inlet and outlet directions to avoid the phenomenon of oil trapping by the gear pump;
(3) Select a reasonable oil circuit to minimize the radial force on the gear;
(4) The shaft sleeve should have good lubricity and can adapt to thin oil or even no oil lubrication conditions.
1. side plate design:
side plate can be made of lead bronze, which can be made of modified polytetrafluoroethylene under limited conditions. The side plate and the combined pump body are connected by a stop table.
hydraulic gear oil pump has radial force imbalance, and the gear shaft deformation deviates to the low pressure area of the pump body, which may cause scraping and boring phenomenon, and at the same time make the floating of the shaft sleeve worse and reduce the working life of the bearing. In the design of the side plate, the method of increasing the high-pressure drainage groove is used to increase the range of the high-pressure oil area of the gear pump. Only 2 to 3 teeth at the pump inlet play a sealing role, so the radial force on the gear is partially balanced, thereby reducing Radial imbalance force.
The structure of the external gear pump leads to the phenomenon of oil trapping. Opening an unloading groove on the side plate is a conventional method to slow down the phenomenon of oil trapping. Under the premise of ensuring that the import and export are not connected with each other, the trapped oil area is reduced through the outlet unloading groove and the pump outlet, and the trapped oil area is increased through the inlet unloading groove and the spring inlet. Reasonable design trapped oil area and unloading groove can greatly improve the working performance of gear pump. There are many specific design methods, which will not be specifically expanded here. Practical application of
2.:
Due to the complex force of the actual shaft sleeve of the hydraulic gear oil pump and the complicated calculation method of the resultant force moment, only one design idea is provided here to calculate with an approximate formula. In the actual design process, we can refer to the above design ideas, using CFD simulation method to calculate the stress of the shaft sleeve in detail, which can further increase the design accuracy.
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2020-12-10
Kunshan Jiafengsheng Precision Electronics Co., Ltd.
Contact: Hu Guang
Tel: 0512-50132658
Fax: 0512-50132758
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