Abstract
The problem of defining the load (nominal torque on the output shaft - T2N) of universal gear drives depending on the size of the gear ratio is analysed in this paper. It is logical that the load capacity of gear drive depends on the weakest gear component. Since the gears are the most expensive components of gear unit, it tends to maximize their performance. However, for low gear ratio, i.e. for high speeds, the bearings often limit their load capacity since the same bearings are used in all transmission ratios because it is not practiced to oversize the bearings at low speeds. Nowadays, when high values of gear ratio are used, it is interesting to consider the dependence of the nominal torque at the output regarding to gear ratio and operating life of the unit.
Highlights
Nominal torque, i.e. load carrying capacity, for universal gear drives, is limited by the load carrying capacity of the weakest component in the gear unit
For low gear ratio, i.e. for high speeds, the bearings often limit their load capacity since the same bearings are used in all transmission ratios because it is not practiced to oversize the bearings at low speeds
The rotation is usually calculated with some mean speed value, so that the bearings are slightly oversized for low speeds, while the load carrying capacity, i.e. nominal torque is reduced in order the lifetime of the bearing must achieve projected lifetime of 10,000
Summary
I.e. load carrying capacity, for universal gear drives, is limited by the load carrying capacity of the weakest component in the gear unit. The load carrying capacity of the bearings, in some cases, can affect the load capacity i.e. nominal torque of gear reducer [4, 5]. Changing of gear ratio causes the changing of speed of shaft and bearings In such a way, it changes the operating life of the bearings [6, 7]. The rotation is usually calculated with some mean speed value, so that the bearings are slightly oversized for low speeds, while the load carrying capacity, i.e. nominal torque is reduced in order the lifetime of the bearing must achieve projected lifetime of 10,000
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