Generally speaking, the chamfer size is determined according to the diameter of the shaft. If the shaft diameter is small, take a small value, otherwise take a large value, generally 0.5 ~ 16 mm ... sometimes it needs to be taken according to the design requirements. At the sliding end, the teeth are chamfered (12 degrees from the vertical) and the tooth ends are rounded. This process is completed by a special gear chamfering machine (available in the market).

Definition of gear hub

The hub is a protruding part near the gear hole, and then there are generally wheel plates and spokes. The width of the hub is the axial length of the hub, which is generally equal to the length of the gear hole.

Hub width b is designed based on shaft diameter d, which is mainly obtained by mechanical analysis. Of course, when it is finally embodied as a drawing, it must be rounded and close to the standard size of the "size series" in the national standard.

The advantages are that the tooth width of the gear can be made narrower, saving materials and size; The axial length of the hub can be made longer, so that the stress surface between the hub and the shaft is larger and the stress is smaller.