Hydrostatic Piston Machine

Abstract

The invention relates to a hydrostatic piston machine ( 1 ) having a drive shaft ( 2 ) which passes through a cylinder-drum unit. Cylindrical clearances ( 18, 19 ) are disposed in said cylinder-drum unit. Pistons ( 16, 17 ), which are disposed in a displaceable manner in said cylinder clearances ( 18, 19 ), are connected to the drive shaft ( 2 ) in a torsion-proof manner. The cylinder-drum unit is centred on a bearing ( 32, 32 ′) provided on the drive shaft ( 2 ). Said cylinder-drum unit consists of a cylinder drum ( 20, 21 ) having a number of cylindrical clearances ( 18, 19 ) constructed therein.

1 . Hydrostatic piston machine having a drive shaft which passes through a cylinder-drum unit in which there are disposed cylindrical clearances in which pistons connected to said drive shaft in a torsion-proof manner are disposed, wherein the cylinder-drum unit is centred on a bearing provided on the drive shaft,
 wherein   the cylinder-drum unit is constructed as a cylinder drum having a number of cylindrical clearances constructed therein.   
   
   
       2 . Hydrostatic piston machine according to  claim 1 ,
 wherein   the pistons are connected to the drive shaft via an articulated connection.   
   
   
       3 . Hydrostatic piston machine according to  claim 2 ,
 wherein   the pistons have a spherical head which is disposed in a corresponding spherical clearance in a carrier plate connected to the drive shaft.   
   
   
       4 . Hydrostatic piston machine according to  claim 1  one
 wherein   the pistons have a conical section disposed between a sealing section their connection to the drive shaft.   
   
   
       5 . Hydrostatic piston machine according to  claim 1   wherein   the cylinder drum has a central through-aperture which interacts in a centring manner with the bearing on the drive shaft.   
   
   
       6 . Hydrostatic piston machine according to  claim 5 ,
 wherein   the bearing on the drive shaft is constructed as a spherical drive-shaft section.   
   
   
       7 . Hydrostatic piston machine according to  claim 6 ,
 wherein   there is provided, in the region of the spherical drive-shaft section, at least one entraining element by which the drive shaft and the cylinder drum are connected to one another in a torsion-proof manner.   
   
   
       8 . Hydrostatic piston machine according to  claim 7 ,
 wherein   the entraining element is fixed in the drive shaft and engages in an entraining groove in the cylinder drum.   
   
   
       9 . Hydrostatic piston machine according to  claim 7 ,
 the entraining element is fixed in the cylinder drum and engages in an entraining groove in the drive shaft.   
   
   
       10 . Hydrostatic piston machine according to  claim 1   wherein   a sealing section having a piston ring is constructed on the pistons.   
   
   
       11 . Hydrostatic piston machine according to  claim 1   wherein   the pistons have a spherical outer contour in the region of their sealing section.   
   
   
       12 . Hydrostatic piston machine according to  claim 1   wherein   in the region of their sealing section, the pistons have a thin-walled piston shaft which can be expanded elastically by the internal pressure in the cylinder.   
   
   
       13 . Hydrostatic piston machine according to  claim 1   wherein   the pistons are fixed in the axial direction by a retraction disc.