Bevel helical gearboxes are units made only in the version with three stages of reduction. The first reduction stage, the one which takes input power and torque, consist of a helical gear pair. on the other hand, the second reduction stage consist of a bevel gear pair with helical teeth: Gleason gear pair. The third and final reduction stage is once more made by a helical gear pair like the first one.
Accessories available for bevel-helical gearboxes
Backstop device – All bevel-helical gearboxes are reversible due to very high efficiency. there are applications where reverse motion is not allowed (for instance, elevators or any equipment used for lifting goods. For this particular cases, a backstop device can be used. Backstop device is placed on the inlet side of the gearbox, i.e. on the input shaft,considering that it is subject to a lower torque. If a backstop device is not wished, it is recommended as option the usage of a brake motor.
Torque arm – although usually MBH units are foot-mounted on a basement, wall or ceiling, both if they are horizontal or vertical, there are a few cases when they can be used as shaft mounting units. With this purpose, there is torque arm as the necessary accessory.
Beside the two accessories already mentioned, the bevel helical gearboxes can be equipped with output flanges, even though the flanged mounting on the outlet is not used very often.