2016-10-06 14:35:00 0
Properly lubricating the open gear is a necessary condition to ensure that the gear works normally, to ensure that the open gear obtains the best bearing capacity and smooth transmission and correct processing and manufacturing, and the accurate alignment of the transmission device. So how to choose the starting gear grease correctly?
Open gear transmission is easy to fall into the dust, debris and other external media and cause lubricant pollution, gears are prone to abrasive wear. When the split gear is covered, under the same working conditions, the lubrication requirements of the open gear are the same as the closed gear.
Open gear transmission usually uses high viscosity oil, asphaltene lubricant or grease, and can work effectively at relatively low speed. There are three grades of classification, namely ordinary open gear oil (CKH), extreme pressure open gear oil (CKJ) and solvent dilution open gear oil (CKM).
When deciding on open gear transmission lubricants, the following factors should be considered:
1) Degree of closure;
2) Peripheral speed;
3) Gear diameter size;
5) How to use lubricating oil;
6) Accessibility of gears.
In addition to the circulation of lubricating oil under certain circumstances, an oil sump should be provided at this time. The lubrication method of open gear transmission is generally full loss type, and any full loss type lubrication system will eventually have only a thin coating on the surface of the gear. They are often under boundary lubrication conditions because when new oil or grease is added to In the tooth surface, due to the pressure of the tooth surface, it is extruded, and the combined effect of the centrifugal force when the gear rotates can only leave a thin oil film on the tooth surface. In addition, considering the gear grinding, the lubricant must be With high viscosity or high consistency and strong adhesion, to ensure that a continuous film of oil remains on the gear surface.
The open gear is exposed to changing environmental conditions. For example, the open gear of the northern canal sluice works in the environment below 0°C in winter, and the open gear system of the paper machine dryer drum works at high humidity and above 60°C. Ambient temperature; Cement kiln drum ring gear works under the conditions of heat, rain and dust, and in an automated production plant, for a large open gear in a large mechanical punch, the environment is not a harsh factor, but if the gear If the lubricant is thrown away, then there is still the danger of damage to the gear.
The most common type of open gear transmission lubricating oil is a black, sticky, extremely heavy petroleum residue material like tar pitch. This material protects the gears. To use them, it must be heated and softened. Now it is generally done by adding a solvent to the oil supplier to make them into a liquid. This solvent is a volatile and non-toxic hydrocarbon. When used, it is directly coated or sprayed. When the solvent evaporates, There is a layer of plastic-like rubber film covering the tooth surface to prevent wear, dust and water damage, and finally achieve the purpose of protecting the gear. Some types of open gear lubricants need to add extreme pressure anti-wear additives. When they are exposed to the atmosphere, they can be thickly 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 lubrication. For small open gears and gear trains, use softer grease.
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