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Lubrication method of oiling device

Liquid lubrication of oiling devices can be further divided into liquid lubrication (see Lubricants and Liquid Lubricants). Lubrication is divided into fluid lubrication and boundary lubrication. The lubrication state between fluid lubrication and boundary lubrication is called mixed lubrication or partial elastic hydrodynamic lubrication.

Oiling device under the appropriate conditions, two friction surfaces can be separated by a certain thickness (1.5-2μm) of viscous fluid, and balance the external load by fluid pressure. Most of the molecules in the fluid layer move freely on the friction surface without the influence of ionic electric field, i.e. friction exists only in the lubricated state between fluid molecules.

The coefficient of friction of fluid lubrication of oiling devices is very low (less than 0.01). Fluid lubrication can be divided into dynamic pressure lubrication and static pressure lubrication according to the way of generating oil film pressure. In the traditional study of lubrication mechanics, the friction body and lubricant are considered as rigid body and viscous fluid (Newtonian fluid). The friction body is actually an elastomer, but sometimes it can be reduced to a rigid body.

Oiling device elastomeric lubrication is a hydrodynamic lubrication that needs to consider the effect of elastic deformation and pressure on viscosity. When the friction body is in a plastic state, the hydrodynamic lubrication with plastic effect is called plastic hydrodynamic lubrication. The traditional research method of fluid lubrication began in 1886 in England, O. Reynolds. traditional lubrication mechanics research results are called classical lubrication mechanics. In fluid lubrication, the viscosity of the fluid is usually measured by its viscosity.

The relationship between the shear stress of the oiling device and the velocity gradient (the rate of change of the fluid velocity u along the direction Y perpendicular to the laminar flow direction) is expressed by an equation, where n is the proportionality constant, i.e., viscosity, also known as dynamic viscosity. The above relationship is called the law of internal friction of fluid laminar flow, also known as Newton's law of internal friction. The fluid that conforms to this law is called Newtonian fluid. For grease plasticizers (called non-Newtonian fluids), the corresponding law of internal friction is t0 is the initial shear resistance of the grease.

Grease applicators should sometimes consider the time dependence of fluid flow. The Reynolds equation is the basic equation describing the pressure distribution of a hydrodynamic lubricating film. The conventional Reynolds equation is based on the equation of motion for viscous fluids, also known as the Navier-Stokes equation. It is obtained by combining the mass continuity equation with some assumptions. In general, the surface tension effect is small and negligible. The extrusion effect can also be neglected when the film thickness h is certain.

Therefore, in most cases, the wedging effect of the lubricant of the oiling device is the main factor to generate the oil film pressure. For gas dynamic pressure lubrication, a state equation should be added to the general Reynolds equation. If the lubricating gas is considered as a real gas and satisfies the multiparty relationship, CP and V are constant pressure specific heat capacity and constant specific heat capacity volume.

The isothermal flow is at n=1; the adiabatic flow is at n=1.401 (air). In solving the general Reynolds equation, it is necessary to use the Reynolds equation to solve the equation. Oiling device boundary lubrication when there is a thin film (boundary film) between two friction surfaces lubrication state. This phenomenon usually occurs when the machine is started or stopped.