BELT-TYPE STEPLESS TRANSMISSION

PURPOSE:To reduce the coefficient of friction in a sliding portion, make it shock-resistant, promote its durability and suppress its vibration, by making a sliding cylinder of a bearing material produced by mixing polyethylene tetrafluoride with a reinforcing filler, and by tightly fitting the cylinder on a drive shaft. CONSTITUTION:A sliding cylinder 10 is tightly fitted on a drive shaft 2. The cylinder 10 is made of a bearing material produced by mixing fluorine resin with a reinforcing filler of fiberglass, carbon fibers or a mixture of both of them. At that time, the bearing material is formed into the sliding cylinder 10 whose inside diameter 10a is slightly smaller than the outside diameter 2a of the drive shaft 2. The drive shaft 2 is press-fitted into the sliding cylinder 10 as the cylinder is heated. When the cylinder 10 is cooled, it contracts due to not only the cooling but also its shape memorizing effect, so that the cylinder is firmly fitted on the drive shaft 2. According to this constitution, the frictional resistance to the sliding cylinder is reduced, the cylinder is made wear-resistant, its strength and shock resistance are heightened, and a vibration is prevented.