What is the principle of hydrostatic transmission? What is the principle of hydrodynamic bearings?

Pascal's principle.

Both hydrostatic transmission and hydraulic transmission are used on the forklift.

Hydrostatic transmission uses Pascal's principle, and typical components are pumps, valves, cylinders, oil motors, etc.;

Hydraulic transmission uses Euler's principle, and the typical components are fluid coupling and torque converter; Pascal's Law is a change in the pressure of a part of a stationary fluid in a closed container that is transferred to all parts of the fluid and the walls of the container without loss. Pascal was the first to elaborate on this law. The pressure is equal to the applied force divided by the applied area.

According to Pascal's principle, applying a certain pressure to one piston in a hydraulic system must produce the same pressure increment on the other piston. If the area of the second piston is 10 times the area of the first piston, then the force acting on the second piston will increase by 10 times that of the first piston, while the pressure on both pistons remains equal. A hydraulic press is an example of Pascal's principle.

It has a variety of uses like hydraulic braking, etc. Pascal also found that the pressure at any point in a stationary fluid is equal in all directions, i.e., the pressure at that point is equal in all planes passing through it.

This fact is also known as Pascal's principle.

Euler's Principle: Pascal's Law is a change in the pressure of a certain part of a stationary fluid in a closed container in the mechanics of fluids (gases or solids) that will be transferred to all parts of the fluid and the walls of the container without loss. Pascal was the first to elaborate on this law.

The pressure is equal to the applied force divided by the applied area. According to Pascal's principle, applying a certain pressure to one piston in a hydraulic system must produce the same pressure increment on the other piston. If the area of the second piston is 10 times the area of the first piston, then the force acting on the second piston will increase by 10 times that of the first piston, while the pressure on both pistons remains equal.

A hydraulic press is an example of Pascal's principle. It has a variety of uses like hydraulic braking, etc. Pascal also discovered:

The pressure at any point in a stationary fluid is equal in all directions, i.e., the pressure at that point is equal in all planes passing through it. This fact is also known as Pascal's principle (definitely.

The principle of hydrostatic bearing: the journal and the bearing are completely separated by the bearing medium of a certain pressure supplied by the outside, so as to reduce the relative friction between the journal and the bearing, and the formation of the dielectric membrane is not limited by the relative sliding speed, and has a large bearing capacity at various speeds (including zero speed).

<> principle of hydrostatic bearing: the journal and the bearing are completely separated by the bearing medium of a certain pressure supplied by the outside, so as to reduce the relative Moppeb friction between the journal and the bearing, and the formation of the dielectric membrane body is not limited by the relative sliding speed, and has a large carrying capacity at various speeds (including zero speed). According to different media, hydrostatic bearings can be divided into hydrostatic bearings and gas hydrostatic bearings.

The spindle buoyancy refers to the displacement value of the spindle floating when the hydraulic pressure formed by the pressure oil entering the oil cavity is balanced with the spindle or load. Hydrostatic bearing is a new type of multi-oil wedge oil film bearing that combines the advantages of hydrodynamic and hydrostatic bearings, and overcomes the shortcomings of both sides. It uses the throttling principle of hydrostatic bearing with ballast to produce a large enough hydrostatic bearing load in the pressure oil cavity, so as to overcome the wear phenomenon of the spindle and bearing caused by dry friction when the hydrodynamic bearing starts and stops, and improves the service life and accuracy retention of the spindle and bearing; After the spindle is started, the dynamic pressure bearing capacity and the static pressure bearing capacity formed by the shallow cavity step effect are superimposed, which greatly improves the load capacity of the main bearing, and the multi-cavity opposition structure greatly increases the rigidity of the spindle. The homogenization effect of the high-pressure oil film and good anti-vibration performance ensure that the spindle has high rotation accuracy and smooth operation.

Pascal's principle.

Pascal's law can only be applied to liquids, where due to the fluidity of the liquid, a change in pressure that occurs in a certain part of a stationary fluid in a closed container will be transmitted in all directions without change. The pressure is equal to the applied pressure divided by the area under force. According to Pascal's law, applying a certain pressure to one piston in a hydraulic system must produce the same pressure increment on the other piston.

If the area of the second piston is 10 times the area of the first piston, then the force acting on the second piston will increase to 10 times that of the first piston, and the pressure on both pistons will be equal.

The principle of static pressure transfer, also known as Pascal's principle, refers to the stationary liquid in a closed container, when a place is subjected to pressure, this pressure will be transmitted through the liquid to any point of the communicator, and its pressure value is equal everywhere.

Pascal's law is a law of hydrostatics. Pascal's Law states that when any point in an incompressible stationary fluid is subjected to an external force to produce a pressure increase, the pressure increase is instantaneously transmitted to each point of the stationary fluid.

Pascal's law was inaugurated by French BPascal proposed it in 1653 and used this principle to make a hydraulic press.

Plain bearings that are hydrostatically lubricated are called hydrostatic bearings. Static lubrication is different from dynamic lubrication in that hydrostatic bearings are provided by an external lubricating oil pump to form a pressure oil film to bear the load. Although many dynamic bearings also use lubricating oil pumps to supply pressure oil, their properties are different, the most obvious is that the oil supply pressure is different, and the oil supply pressure of hydrostatic bearings is much higher than that of dynamic bearings.

One of the main features of hydrostatic bearings is that they can also establish a load-bearing oil film in a completely stationary state, which can ensure that there is no direct contact between the two surfaces of the friction pair during the start-up stage, which is absolutely impossible in dynamic bearings.

Therefore, when starting a rotor with hydrostatic bearings, the hydrostatic lubrication system must be started first.

In the operation of the hydrostatic bearing, due to the relative motion of the friction pair, the dynamic pressure effect may also be generated, and when the dynamic pressure effect reaches a certain share, the bearing becomes a dynamic and static hybrid bearing.