The teeth on Greenhouse Gearbox helical gears are trim at an angle to the facial skin of the apparatus. When two tooth on a helical gear system engage, the contact begins at one end of the tooth and steadily spreads as the gears rotate, before two teeth are in full engagement.

This gradual engagement makes helical gears operate a lot more smoothly and quietly than spur gears. Because of this, helical gears are found in almost all car transmissions.

Due to the angle of one’s teeth on helical gears, they create a thrust load on the gear when they mesh. Gadgets that make use of helical gears have bearings that can support this thrust load.

One interesting thing about helical gears is that if the angles of the gear teeth are right, they can be mounted on perpendicular shafts, adjusting the rotation angle by 90 degrees.