Development and origin of axis

1. origin: the shaft is a cylindrical object that passes through the middle of bearings, wheels or gears, but several of them are square. A shaft is a mechanical component that supports the rotating component and rotates with it to transmit motion, torque or bending moment. Generally, it is a metal bar, and each section can have different diameters. The rotating parts in the machine are mounted on the shaft.

There are three common shafts: crankshaft, straight shaft and flexible shaft.

2. Development: The straight shaft can be divided into: ① the rotating shaft, which bears both bending moment and torque when working, is the most common shaft in machinery, such as the shaft in various reducers. (2) The main shaft is used to support the rotating parts, only bearing bending moment and not transmitting torque. Some spindles rotate, such as the shafts of railway vehicles, while others do not, such as the shafts supporting pulleys. (3) The transmission shaft is mainly used to transmit torque without bearing bending moment, such as the long optical axis in the mobile mechanism of crane and the driving shaft of automobile. The material of the shaft is mainly carbon steel or alloy steel, and nodular cast iron or alloy cast iron can also be used. The working capacity of the shaft generally depends on the strength and stiffness, and also depends on the vibration stability at high speed.