What are the rollers of tapered roller bearings?

Are the rollers of tapered roller bearings cylindrical, cylindrical, or of other shapes? Why is the cross-sectional drawing of the stick rectangular when drawing? So the actual typo reflected should be replaced with something that is ignored, which should be a cylinder Why are cylindrical rollers still called tapered roller bearings?

Conical roller bearings are not only "because the raceway has a certain taper", but also because the rollers must have a certain taper, and the vertex of the roller cone and the vertex of the inner and outer raceway cones must be the same point and on the axis centerline (similar to a bevel gear). Otherwise, when the bearing moves, the roller head and raceway will experience sliding friction due to the same angular velocity but different linear velocities, resulting in low bearing efficiency, heat generation, and easy damage. This situation can be compared to the automotive active theory without a differential. Cylindrical rollers are only used when the raceway is cylindrical.

The mechanical drawing standard specifies that the simplified drawing method for tapered roller bearings is to draw the rollers as cylinders.

We sometimes see a drawing called a "standard shape" that depicts a cone. In the older standard (GB297-64), there are three drawings: standard shape, installation dimensions, and simplified drawing method.

The rollers of tapered roller bearings are conical frustum cylinders, and sometimes the cross-section is simplified and drawn as a cylinder to avoid misunderstandings (there are models in the list), which is also allowed.

The rollers of cylindrical ball bearings are cylindrical.

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