Shaft is the most common part in machinery and equipment. Its main purpose is to support rotating parts, transmit torque, force and motion. Together with other parts, it forms the shafting components and is an important part of the machine. Shafts are divided into rigid shafts and flexible shafts, of which rigid shafts are most widely used.
1、 Rigid shaft
1. It is divided into straight shaft and crankshaft according to the axis shape.
Straight axis: the straight axis is divided into optical axis and stepped axis, of which the stepped axis is most used. It is characterized by simple structure and convenient manufacture, and is most commonly used.
Crankshaft: it can realize the conversion between rotary motion and linear reciprocating motion, but its structure is complex and processing is difficult.
2. According to the section shape, it is divided into solid shaft and hollow shaft.
Solid shaft: it is the most commonly used because of its simple structure and convenient manufacture.
Hollow shaft: other parts can be installed at the hollow part. Under the same weight, it has greater strength and stiffness than the solid mandrel. Processing is difficult.
3. According to the load type, it is divided into spindle, transmission shaft and rotating shaft.
Mandrel: only bear bending moment but not torque.
Transmission shaft: only bear torque but not bending moment.
Rotating shaft: bear bending moment and torque at the same time.
2、 Flexible shaft flexible shaft is mainly divided into power type and control type. It is used for spatial transmission where the axes are not concentric or move relative to each other. It can absorb vibration and impact, and is compact in size, but the rotating speed of the driven end is uneven and the torsional stiffness is low. It is suitable for high-speed and low torque occasions.
