Cycloidal pinwheel reducers have a series of obvious disadvantages, and some of them, such as the high cost issue, are quite prominent. Some of these disadvantages happen to be the advantages of involute few-tooth difference reducers. The specific manifestations are as follows:
First of all, cycloidal pinwheel reducers have strict requirements for the materials of the parts, mostly using bearing steel. In terms of processing, the precision requirements are extremely high. Most parts need to be ground, and a large number of parts also have to undergo quenching, and the requirements for heat treatment are also quite strict. These factors undoubtedly significantly increase the cost.
Secondly, the tooth surface of cycloidal pinwheel reducers is of double-convex contact, and the contact stress is relatively large. In contrast, involute few-tooth difference reducers are in the form of internal meshing, with smaller contact stress, and thus can use soft tooth surfaces.
Furthermore, when the output torque is large, the radial size of the appearance of cycloidal pinwheel reducers will become very large, far exceeding that of involute NGW reducers. This feature greatly limits its application in mechanical fields such as metallurgy, mining, heavy machinery, and coal mining. For example, in coal mining machinery, cycloidal pinwheel reducers are rarely used.
Finally, although the input shaft of the cycloidal pinwheel reducer can reach balance under static conditions, it is unbalanced during dynamic operation. When the model exceeds Bw_33, the rotational speed of its input shaft must be limited and not exceed 1000r/min.