Results
and Analysis Cylindrical bearings are used as an example to investigate
the effect of fluid inertia on lubrication performance and load
carrying capacity. The
dimensionless film thickness h of a cylindrical bearing is determined
by the ratio l / d of length to diameter and the eccentricity e, while
the dimensionless Reynolds equation contains only the relative Reynolds
number re, so the bearing performance can be expressed by these three
dimensionless parameters. The
relative Reynolds numbers in the gear pump bearing are taken as 0, 2,
4, and 6, respectively. Where re is 0, the influence of inertial force
is not considered in the lubrication equation. The bearing clearance ratio is set at 013% and the corresponding
Reynolds numbers are 0,667,1334,2000, respectively. These Reynolds
numbers represent the transition from the laminar flow through the
laminar flow to the turbulent flow.
In
a certain eccentricity, the bearing to a certain angle of deflection
steel bearing to the water film bearing capacity and the balance of the
external load. Is the eccentricity of 018, the bearing is in equilibrium position of its central radial section of the pressure distribution. Nearly the entire water film formation area, the hydrodynamic inertia of the water film slightly increases the pressure. Increasing the water film pressure The slip-free oil-filled bushing
SF-1 inevitably leads to an increase in bearing capacity; and small
changes in the water film pressure distribution in the circumferential
direction result in small changes in the equilibrium position of the
shaft, as shown.
Effect
of fluid inertia on deflection angle (l / d = 4) Unlike cylindrical
bearings, water-lubricated bearings have axial grooves evenly
distributed in the circumferential direction. Because the lubrication performance mainly depends on the flow state
of the small gap in the bearing, and the narrow wedge shape of the
rubber bearing is similar to that of the cylindrical bearing, it can be
considered that the influence of the fluid inertia on the water
lubricity of the rubber bearing in the second laminar flow zone is
slight.
Conclusion
In this paper, a typical numerical example of a water-lubricated rubber
bearing is taken as an example. It shows that the bearing flow state
crosses the laminar flow, the second laminar flow area and the turbulent
flow as the rotation speed increases. In
order to obtain the fluid lubrication equation suitable for the second
laminar flow regime, the Reynolds equation of inertial force in the
cylindrical coordinate system is deduced from the continuum equations of
hydrodynamics basic equations and the navier-stokes equations. Furthermore,
the influence of the fluid inertia on the lubrication performance and
bearing capacity of the cylindrical bearing in the second laminar flow
zone was investigated by numerical calculation. The
results show that the inertia of the fluid increases the pressure of
the water film slightly in almost the entire region of the water film
formation. The increase of the pressure of the water film leads to the
increase of the bearing capacity of the bearing. The small variation of
the distribution of the water film pressure in the circumferential
direction leads to the axial center Balance the location of small changes. In
view of the fact that the shape of the narrow gap in the rubber bearing
is similar to that of the cylindrical bearing, it can be considered
that the fluid inertia in the second laminar flow zone has little effect
on the water lubricity of the rubber bearing.
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