Many years ago I journeyed across the world with my mother to visit my father in Shanghai, China. He was away for six months for his job. If you don’t include Canada, it was my first time outside the United States. However, the initial cultural shock was dampened a bit because Shanghai is pretty modernized. It also didn’t hurt that i was prepared with stories from my brother and father of what to expect. Even so, one thing that amused me while I was in China was the shops. They looked like merely garages where people set up their store inside. At night all the stores pulled down and looked their shutter doors until morning. Actually, it can be likened to stores in a super mall, but flipped inside out.
Upon close examination of most shutter doors, a bevel gear can be seen. Its purpose is to roll the door up and down. Other applications that use bevel gears include the cars printing presses, nuclear power plants and railway track inspection machines. These gears are a class of speed reducers that are designed to connect with another gear mounted on an axis. This may be positioned at any number of angles, although bevel gears are most commonly used at 90 degrees of each other. The face of the gear is angled and the shape is typically conical.
Although a bevel gear must be precisely mounted, it makes it possible to change operating angles. The number of teeth on each wheel can also be differentiated to change rotational drive and torque of one wheel in relation to the other. There are a couple of different types of bevel gears. A straight bevel gear has teeth that are straight and run vertically along the cone. A hypoid bevel gear’s axes do not intersect. Among other applications, hypoid bevel gears are found in car differentials.