Correctly lubricating the open gear is a necessary condition to ensure the normal operation of the gear, to ensure that the open gear obtains the best bearing capacity and smooth transmission, correct processing and manufacturing, and accurate alignment of the transmission device. So how to choose the correct starting gear grease?

In the open gear transmission, external media such as dust and chips are easy to fall into the lubricating oil pollution, and the gears are prone to abrasive wear. When the open gear is covered, the lubrication requirements of the open gear are the same as the closed gear under the same working conditions.

Open gear drives typically use high viscosity oils, asphaltene lubricants or greases and operate effectively at lower speeds. There are three grades of classification, namely ordinary open gear oil (CKH), extreme pressure open gear oil (CKJ) and solvent diluted open gear oil (CKM).

When deciding on lubricating oil for open gear transmission, the following factors should be considered:

1) The degree of closure;

2) Circumferential speed;

3) Gear diameter size;

4) Environment;

5) How to use lubricating oil;

6) Accessibility of gears.

Except that the lubricating oil can be circulated back in some occasions, an oil pool should be set up at this time. The lubrication method of open gear transmission is generally total loss type, and any total loss type lubrication system eventually has only a thin coating on its gear surface, and they are often in boundary lubrication conditions, because when new oil or grease is replenished. When the tooth surface is extruded due to the pressure of the tooth surface, and the combined effect of centrifugal force when the gear rotates, only a thin oil film can be left on the tooth surface. In addition, considering the gear grinding effect, the lubricating oil must be High viscosity or high consistency and strong adhesion to ensure a continuous oil film remains on the gear surface.

Open gears are exposed to changing environmental conditions. For example, the open gears of the Northern Canal sluice work in an environment below 0°C in winter, and the open gear systems of paper machine dryer drums work in high humidity and above 60°C. Ambient temperature; cement kiln drum ring gears work under heat, rain and dust environmental conditions, while in automated production plants, for large open gears in large mechanical punches, the environment is not a harsh factor, but if the gear There is still a risk of damage to the gears if the lubricant is thrown away.

The most common type of open gear lubricant is a black, sticky, extremely heavy petroleum residue material like tar pitch that protects the gears and must be softened by heating to use them. Now, the oil supplier usually adds a solvent to turn them into a liquid. This solvent is a volatile non-toxic hydrocarbon, which is directly coated or sprayed when used. When the solvent evaporates, There is a plastic-like rubber film covering the tooth surface to prevent wear, dust and water damage, and finally achieve the purpose of protecting the gear. Certain types of open gear lubricants incorporate extreme pressure antiwear additives, which, when exposed to the atmosphere, can be thick and firmly attached to the gear surface to prevent dust deposition and water erosion.

When considering the lubrication method, it should be known that circulating oil is more effective and convenient for gear lubrication than periodic oiling. Use a softer grease for small open gears and gear trains.