In case of planetary gears, the first problem is how to distribute the load evenly to a number of planets. Whatever modern accurate workmanship may be employed, it would be a difficult task to attain a sufficient load equalization if some measures to alleviate the influence of inevitable inaccuracy of workmanship is not be incorporated into the structure.
The method widely used abroad for this purpose, is, to our knowledge, to make use of elastic deformation of components of the structure.
Concerning the load equalization of planets, this paper deals with the principle of and the theory about the function of the “floating intermediate ring” which has been newly developed by us.
The “floating intermediate ring” magnifies the displacement of planet's center arising from the equilibrium of load and lublicating film pressure as is the case of oil lubricating bearings, thereby giving a remarkable big compliance to each of the planets.
This new concept is considered to make the planetary gears free from the mechanical difficulties and the structural complexity which are often seen in the usual types.

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