What are the lubrication methods of gears?

release time:

2022-02-15

Lubrication plays a decisive role in the normal operation and service life of the gear transmission. Lubricant plays various functions such as lubrication and cooling in gear transmission, which ensures the normal operation of the gear at a certain working temperature and prolongs the service life of the gear

What are the lubrication methods of gears?

Boundary lubrication: there is an oil film separating the meshing tooth surfaces, the oil film formed between the meshing tooth surfaces is not strong enough, the fluidity is poor, and it is not enough to maintain stable elastic fluid lubrication, mainly relying on a layer of chemical reaction formed by lubricating oil additives on the metal surface film and physical adsorption film to play a lubricating role. Gears under boundary lubrication state have extremely limited load, speed, temperature and time capabilities, and are prone to wear and tear, resulting in gear failure.

Elastic fluid lubrication: Since there is a certain strength elastic flow lubricant between the two gear surfaces, the meshing surfaces are completely separated, so that the motion friction of the two friction surfaces becomes the internal friction of the fluid, and the heat generated by the motion is taken away in time. Bear a certain load at a certain speed to achieve the normal operation of the gear, which is the most ideal lubrication state.

Mixed lubrication: a state that often occurs in gear transmission. Between the meshing tooth surfaces of the gear teeth, the dynamic lubrication of the residual body elastic film is dominant, and boundary lubrication and dry friction exist simultaneously.

The above is the common gear lubrication method. Since the lubricant forms a lubricating elastic oil film with a certain strength between the gear meshing surfaces, the meshing tooth surfaces are separated, and the extreme pressure additive in the lubricant forms a chemical reaction film with the metal surface. To cope with the boundary conditions that appear at any time, so the separation between the gears is maintained, and the purpose of eliminating wear is achieved.

Therefore, the lubricant to maintain normal gear operation must have good extreme pressure and anti-wear properties, excellent lubricating properties, suitable viscosity, good fluidity and heat dissipation, certain anti-rust and anti-corrosion properties, and good anti-emulsification properties and the lowest possible transmission sound. Gear lubrication is very helpful for reducing noise and prolonging the service life of gears.