According to the relative movement between two parallel plates, and assumes that the oil is in the nature of laminar flow, has formed export law of viscosity and dynamic pressure lubrication three conditions:

Assumptions: (1) fluid is in the nature of laminar flow, comply with the law of viscosity (2) liquid incompressible flow is constant (3) infinite flat along the Z direction, so there is no flow along the Z direction, no side stream

1, the reservoir velocity distribution 2, lubricating oil flow Lubricating oil in unit time through unit width on any section h area traffic Three basic equations, the dynamic pressure bearing Type as the calculating infinite dynamic pressure bearing on the basic equations.

Discussion: 1. By type to see the change of oil pressure and oil viscosity, sliding velocity and oil film thickness, surface can be calculated using the type of oil film pressure at every point P, then to calculate the oil film bearing capacity according to pressure distribution. 2. Use equation to explain oil wedge bearing mechanism Two sliding surface tilt, make convergence is formed in the oil film shape space, the wedge space formation pressure change. A. h = h0, there are ultimate pressure values B. in h0 left h < h0, oil pressure decreases with increasing X, oil pressure is greater than any profile utilizing the oil pressure. C. h on the right side h0 profile > h0, oil pressure increases with the X, while any profile gets the inlet oil pressure in oil hydraulic force. Wedge a space so the oil can produce a positive pressure load balance If two parallel plate, oil pressure along the X no change cannot be formed 3. The three conditions Convergence of wedge space;Viscosity;Speed. Second, the process of formation of hydrodynamic lubrication radial sliding bearing The process of establishing hydrodynamic lubrication radial sliding bearing can be divided into the following three stages: 1. The startup phase 2. The unstable operation stage With the increase of rotational speed, with one wedge also gradually increase, the oil in the oil film bearing area is increased, thus gradually reduce friction resistance, so the shaft neck and move to the lower left corner. 3. The fluid dynamic lubrication operation stage When the rotating speed n increased to a certain value, the journal into enough oil to separate the two friction surface, bearing oil film formation.At this time, the pressure inside the reservoir has been able to support the load, the balance of journal started working in liquid friction state, namely entered a stage of stable operation. Three, the radial sliding bearing geometric relationships 1. The diameter of clearance 2. The relative gap 3. The eccentricity 4. The relative eccentricity