| 摘要 |
A pistom barrel is rotatable in the bore and spaced from the bore walls and an antifriction bearing structure surrounding the barrel between the barrel and the bore. A series of axial pistons are provided in the barrel which are open at one end and have fluid passages through the barrel at the other end. A piston is provided in each piston bore which extends out of the open end. A spring is provided between each piston and the other end of the piston bore. A fixed ramp swash plate is provided in the housing bore beneath the extending pistons and an antifriction thrust bearing is provided between the swash plate and pistons. An axial drive shaft is provided on the barrel which extends through an antifriction bearing in an opening in the housing opposite the bore for drivingly engaging on external drive structure.
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