Abstract
It is of utmost importance to know the friction loss of helical gears because they are produced quite widely used. However, basic research, e. g., load carrying characteristics of helical gears and friction loss, is extremely scarce. In this paper the authors focused on the influence of the kind of lubricating oil on the friction loss of helical gears. Further they dealt with the influence of height of teeth on friction loss of helical gears. The authors carried out experiments to study the influence of lubricating oil viscosity, additive, and base oil type as well as rotational speed on friction loss of helical gears. Not only mineral oils but also synthetic oils were used as base oils, e. g., paraffin, poly-α-olefin, and polyglycol type oils. As additives the authors used EP additive and ZnDTP. Further they investigated the influence of tooth height on friction loss. The experimental results gained make it possible to drastically reduce friction loss of helical gears.
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