![]() ![]() It needs at least 3m/s tangential speed to be effective. The rotating gears splash lubricant onto the gear system and bearings. Splash lubrication is used with an enclosed system. Excess grease will cause agitation, viscous drag and result in power loss. However, too much grease can be harmful, particularly in an enclosed system. There must be sufficient grease to do the job. So it may become a problem with temperature rise under high load and continuous operating conditions. The cooling effect of grease is not as good as lubricating oil. – Not suitable for use under high load and continuous operation. – Choosing a lubricant with suitable cone penetration.Ī lubricant with good fluidity is especially effective in an enclosed system. There are three major points regarding grease: Grease lubrication is suitable for any gear system that is open or enclosed, so long as it runs at low speed. ![]() The following is a brief discussion of the three lubrication methods. Table13.1-2 Ranges of sliding speed (m-s) for worm wheels Table13.1-1 Ranges of tangential speed (m-s) for The proper selection of lubricant is especially important. Worm gearsor screw gears, care should be taken in selecting the right type of lubricant quantity and methods. When using gears at high speed / heavy load, or when using easily worn gears such as Usage of lubricants under improper conditions cause damage to gear teeth. Since lubricants diminish or become depleted in the long term, periodic checks for oil change or refilling is necessary. Grease lubrication can be applied in low speed / low load applications, however, it is important to apply grease periodically, especially for gears of the open-type usage. Table 13.1 presents lubricants, methods and their applicable Sometimes, for maintenance reasons, a grease lubricant is used even with high speed. For medium and high speeds, splash lubrication and forced oil circulation lubrication are more appropriate, but there are exceptions. Choice depends upon tangential speed(m/s) and rotating speed(rpm).Īt low speed, grease lubrication is a good choice. There is no single best lubricant and method. (2) Splash lubrication (oil bath method). There are three gear lubrication methods in general use: To avoid difficulties such as tooth wear and premature failure, the correct lubricant must be chosen. Limit the temperature rise caused by rolling and sliding friction. Promote sliding between teeth to reduce the coefficient of friction μ.Ģ. The purpose of lubricating gears is as follows:ġ. ![]()
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