Effects of Outer Rotor Grooves on the Water Film Characteristics of Double Journal Stepped Cavity Sliding Bearings
The outer rotor double journal stepped cavity sliding bearing with grooves is a common structure of electronic water pump bearings.The water film pressure and bearing capacity directly affect the stability and service life of the rotor system.The fluid analysis on the water film characteristics of outer rotor sliding bearings with different grooves is carried out based on the finite element method.The distribution law of bearing water film pressure under a certain speed and eccentricity is obtained.The Influence of structure and number of grooves on water film pressure and bearing capacity are investigated.The results show that the grooves change the water film pressure distribution in the double journal area.The bearing with the trapezoidal cross-section water groove has better bearing capacity.Compared with the grooveless structure,the circumferential pressure curve of the journal water film becomes unsmooth due to the linear groove.The water film bearing capacity decreases and fluctuates periodically along the radial direction.The peak pressure decreases as the number of grooves increases.The spiral groove significantly increases the water film pressure,bearing capacity and stability,but an uneven distribution of axial water film pressure on the double journal appears when the groove spiral angle increases to 60°.
sliding bearingwater groovewater lubricationfinite element method
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