Power transmitting device

Claim 1

A power transmission device comprising a first rotary shaft and a second rotary shaft which are arranged coaxially, a sun roller connected to said first rotary shaft, a stationary outer ring disposed concentrically with said sun roller, said outer stationary ring and the casing of said power transmission device formed as one singular piece, and a plurality of planet rollers disposed in the annular space between said sun roller and said stationary outer ring, said planet rollers being carried by a carrier rotatable as a unit with said second rotary shaft, a pair of mutually opposing flange-like projections formed on the outer peripheral surface of said stationary outer ring and casing structure so as to pass positions adjacent to respective axial ends of the area of contact between said planet rollers and said stationary outer ring; and tightening means operable from the outside of said transmission casing structure and urging said flange-like projections towards each other to cause an elastic deformation of said stationary outer ring; said tightening means comprising a plurality of tightening bolts which are screwed to threaded holes in one of said flange-like projections through holes formed in the other of said flange-like projections wherein substantially only radial forces are being applied inwardly from said elastically deformed stationary outer ring upon said planet rollers whereby the levels of contact pressure between said sun roller and said planet rollers and between said planet rollers and said stationary outer ring are adjustable through adjustment of amount of tightening by said tightening means.