Stepless gear with sliding element chain

摘要

The invention relates to a stepless gear in which a fixed bevel wheel 5 and a bevel wheel 6 which can be displaced axially by in each case one compressed air cylinder 7 are arranged on each of the driveshaft 8 and output shaft 9. The axial and radial adjustment of the frictionally engaging sliding element chain arranged between the bevel wheels 5 and 6 is carried out with the control slide A without an interruption in the pulling force with a difference in pressure in the two compressed air cylinders 7. The control slide A which is connected to the compressed air accumulator B and the compressed air cylinders 7 of the shafts 8 and 9 by means of lines consists of the adjustable control slide 11 with two wide control channels and of the slide bushing 12 with four narrow control channels. In the centre position of the control slide 11 the two compressed air cylinders 7 are connected to the compressed air accumulator B. In the "+" position, the path of the air via the line 14 to the compressed air cylinder 7 of the output shaft 9 is blocked during changing up and at the same time the connection to the overpressure valve Ü is opened. During changing down, the control slide 11 blocks the path of the air via the line 13 to the compressed air cylinder 7 of the driveshaft 8 in the "-" position and opens the connection to the overpressure valve Ü so that even outflowing air carries out the adjustment when there is a pressure difference in the two compressed air cylinders 7. <IMAGE>