Research on the lubrication characteristics of water hydraulic slipper friction pairs

2006 ◽  
Vol 220 (10) ◽  
pp. 1559-1567 ◽  
Author(s):  
L Huanlong ◽  
K Jian ◽  
W Guozhi ◽  
Y Lanying
Keyword(s):  
Simulation Analysis ◽  
Water Film ◽  
Low Viscosity ◽  
Analysis Experiment ◽  
New Type ◽  
Hydraulic Axial Piston Pump ◽  
Water Hydraulic ◽  
Lubrication Characteristics ◽  
Type Water ◽  
Axial Piston

The low viscosity of water makes the film of water in water hydraulic axial piston pump slipper friction pairs very thin, and which can be broken easily. By simulation, analysis, experiment, and comparison, the lubrication characteristics of the new-type water slipper friction pairs, especially its anti-turnover ability, which directly affects the working reliability of the water film, are examined by a study of water's flow pattern. On the basis of the idea of multi-groups of damping and supporting cavity, the independent stiffness adjustment is used to improve the anti-turnover ability of the water slipper friction pairs. Furthermore, on the basis of the N-S equations, the fluid lubrication characteristics of water hydraulic clearance friction pairs are examined more thoroughly and accurately, taking into account the inertia, the surface roughness etc, so as to revise the calculation and analysis results of water hydraulic slipper lubrication characteristics put forth by classical theory.

Cavitation Effect to the Hydraulic Piston Pump Flow Pulsation

2014 ◽  
Vol 599-601 ◽  
pp. 230-236 ◽  
Author(s):  
Huan Zhang
Keyword(s):  
Piston Pump ◽  
Flow Pulsation ◽  
Hydraulic Pump ◽  
Fluid Field ◽  
Cavitation Effect ◽  
Hydraulic Piston Pump ◽  
Hydraulic Axial Piston Pump ◽  
Water Hydraulic ◽  
Rotary Speed ◽  
Axial Piston

The flow pulsation is one of the main factors, which affect the performance of water hydraulic piston pump, and cavitation also has importance effect on flow pulsation. In this paper, CFD technology is used to simulate visually the porting process，which causes the flow pulsation in water hydraulic axial piston pump. As a result, the flow pulsation rates and other parameters on fluid-field corresponding to different rotary speed and different loading are obtained respectively when cavitation is considered and not, which can present theoretic references for the development of water hydraulic pump.

Research on the sliding bearing pair of water hydraulic axial piston pump

2013 ◽  
Vol 227 (9) ◽  
pp. 2049-2063 ◽  
Author(s):  
Fanglong Yin ◽  
Songlin Nie ◽  
Zhenghua Zhang ◽  
Xiaojun Zhang
Keyword(s):  
Piston Pump ◽  
Hydrodynamic Condition ◽  
Axial Piston Pump ◽  
Test Rig ◽  
Sliding Bearing ◽  
Noise Characteristics ◽  
Lubrication Condition ◽  
Hydraulic Axial Piston Pump ◽  
Water Hydraulic ◽  
Axial Piston

Sliding bearing pair is one of the important friction pairs within water hydraulic axial piston pump, which can result in significant influences on the pump’s performance. Generally, owing to the characteristics of low viscosity and poor lubrication of water, the sliding bearing will operate under condition of dry or mixed lubrication, leading to a severe adhesives wear and material softening. In order to investigate the flow field of the sliding bearing in hydrodynamic condition, the effects of the water film pressure distribution, load carrying capacity changing with radial clearance and width–radius ratio of the sliding bearing pair have been simulated through MATLAB. And a suitable material combination of the sliding bearing pair was selected though a custom-manufactured friction and wear test rig. Based on the theoretical and experimental studies, an appropriate structure of the sliding bearing within water hydraulic axial piston pump was designed. The loading experiments for the developed water hydraulic axial piston pump assembled with two different flanges have been conducted at a water hydraulic component test rig. The experimental results revealed that the volumetric efficiency and noise characteristics of the pump are remarkably improved when the sliding bearing work under hydrodynamic lubrication condition in comparison with dry lubrication condition. The research results have laid the foundation for the development and improvement of the water hydraulic axial piston pump.

The Research and Simulation Analysis of a New Type of Translational Transmission Device

2014 ◽  
Vol 556-562 ◽  
pp. 1408-1412
Author(s):  
Zhi Qiang Zhang
Keyword(s):  
Modeling And Simulation ◽  
Theoretical Foundation ◽  
Simulation Analysis ◽  
Structural Modeling ◽  
Structural Features ◽  
Practical Application ◽  
Optimization Analysis ◽  
New Type ◽  
Mechanism Parameter ◽  
Relationship Of

In this paper, the following work is done: a new type of translational transmission device is designed; explained in detail are the operating principle, structural features, relationship of mechanism parameter and non interference conditions of the movement; the optimization analysis of transmission device is implemented on the basis of non interference conditions of the bucket movement; structural modeling and simulation analysis are carried out by utilization of Pro/e & Recurdyn; and based on virtual prototype technology, the new type of translational transmission device is verified by experiments, the data of which prove the translational transmission device reasonable and practicable. In conclusion, this paper has laid the theoretical foundation of the practical application of the translational transmission device.

Dynamic Characteristic Analysis of New Pneumatic Bending Joint

2012 ◽  
Vol 271-272 ◽  
pp. 1742-1749
Author(s):  
Peng Cheng Huang ◽  
Qing Hua Yang ◽  
Guan Jun Bao ◽  
Li Bin Zhang
Keyword(s):  
Response Time ◽  
Dynamic Characteristic ◽  
Simulation Analysis ◽  
Characteristic Analysis ◽  
Pneumatic Actuators ◽  
Bending Performance ◽  
First Law Of Thermodynamics ◽  
Existing Problems ◽  
Joint Damping ◽  
New Type

Aimed at existing problems on the bending performance of pneumatic bending joint, a new type of pneumatic bending joint is proposed in this paper. Double flexible pneumatic actuators are used as actuating drivers. Based on the first law of thermodynamics and the joint dynamic equation, the angle dynamic model is established and analyzed. Moreover simplified model is proposed. Meanwhile, its dynamic characteristic is analyzed through simulation analysis. The simulation suggests the following results: in the gas-filled phase, the joint’s pressure response time is about 10ms; while it is about 60ms in the gas-escape phase; and the angle response time of joint is 10 to 20ms. When the joint damping coefficient is increasing, this value will also increase.

The Performance Analysis and Experimental Research of Multiple Oil Ports Axial Piston Pump which Able to Control the Movement of Differential Cylinder Directly in the Closed Circuit

2011 ◽  
Vol 308-310 ◽  
pp. 388-400
Author(s):  
Xiao Gang Zhang ◽  
Long Quan
Keyword(s):  
Digital Simulation ◽  
Flow Distribution ◽  
Closed Circuit ◽  
Piston Pump ◽  
Distribution Area ◽  
Axial Piston Pump ◽  
Hydraulic Pump ◽  
Asymmetric Flow ◽  
New Type ◽  
Axial Piston

In order to realize that an asymmetric flow piston pump can control an asymmetric differential cylinder, a proposal about the application of an asymmetric flow-distributing axial piston pump is put forward. The new type of piston pump can output the flows with two different values to control the movement of the differential cylinder directly in the closed circuit and realize much ideal result of the control of the differential cylinder by a single pump. Also a simulation model of the hydraulic pump is established under the circumstance of SimulationX software, considering the characteristics of the movement of an individual piston, the oil compressibility, and the flow distribution area changed with the rotation angle. The key data of the pump is defined by means of digital simulation. In particular, an analysis is made on the dimension of the unloading groove of the port plate and the characteristics of the flow pulse of the pump. Furthermore, an experimental model pump is manufactured, the basic performances of the pump is tested on the experimental platform at various rotatory speeds such as pressure, flow and noise, in the end the accuracy of the principle is verified.

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