MITCalc - Worm Gear ((INSTALL))
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A diagram of a conventional epicyclic transmission is shown in the Figure. The device has a worm gear, two compensating shafts, a ring gear and a sun gear. In this case, there are two inputs, and the maximum transmission ratio is 16 to 1. The worm gear is driven by the input shaft 1. The output shaft is split into two branches, which are driven by the worm gear. The sun gear is driven by the worm gear. The ring gear is driven by the compensating shafts. The compensating shafts are driven by the sun gear. One is a motor shaft, while the second shaft is connected to the sun gear.
As can be seen, the epicyclic transmission is a very compact and low-friction device, but it is relatively complicated and expensive. The epicyclic transmission is used in applications in which the transmission ratio is often changed and often requires a constant speed. This device helps in high-speed applications. However, the epicyclic transmission is more expensive than the worm and spur transmission.
The differential gearing configuration is more lightweight, less costly and permits the application of a wider range of diameters. Differential gearing offers higher efficiency and lower loss in the transmission. The basic design of a differential gearbox is shown in this picture .
The worm gear can be selected using the gear icon on the bottom left. The worm gear is entered into the right field, and the range is entered using the keyboad. The worm gear is connected to the following parameters:
The gear ratio is based on the gear angle and the recommended transmission ratio. It is possible to select the gear and the transmission ratio and define the new gear angle and the new transmission ratio. The gear ratio can be calculated using the total number of teeth of the worm gear and the number of teeth of the gearwheel. When the gear is defined as a worm gear with no friction, the calculation uses the number of teeth of the worm gear and the number of teeth of the fixed gearwheel. In the case of helical worm gears, the calculation uses the numbers of teeth of the helix. Depending on the gear ratio, the lead angle of the worm gear may differ; therefore, the lead angle of the worm gear is entered into the field. 827ec27edc