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Let's take a look at the definition and characteristics of hollow shafts

Hollow shaft refers to a through hole made in the center of the shaft body, with an inner keyway inside the through hole. The outer surface of the shaft body is machined with a stepped cylinder and an outer keyway.
The outer surface of the shaft body is machined with a stepped cylinder and an external key groove. The center through-hole of the shaft is sleeved with the main shaft of the press chamber, and the input power is driven by the transmission gear installed on the cylinder on the outer surface of the shaft to directly transmit to the main shaft of the press chamber.
The hollow shaft occupies a relatively large space volume, but it can reduce weight. According to material mechanics analysis, when transmitting torque on a rotating shaft, from a radial cross-section perspective, the greater the effect of transmitting torque at the outermost point. When the shaft needs to transmit a large torque, a thicker shaft diameter is required. Due to the small effect of transmitting torque at the shaft center, hollow ones are generally used to reduce the self weight of the shaft.

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