Hydrostatic piston machine according to the floating cup concept

Abstract

The invention relates to a hydrostatic piston engine ( 1 ) which is based on the floating cup principle and comprises a first swash plate ( 16 ) and as well as a second swash plate ( 17 ). A first cylinder drum unit ( 11, 14 ) rests against the first swash plate while a second cylinder drum unit ( 12, 15 ) leans on the second swash plate ( 17 ). A first group of pistons ( 10 ) and a second group of pistons ( 12 ) are connected in a fixed manner to a drive shaft ( 5 ) of the hydrostatic piston engine ( 1 ). The first group of pistons ( 10 ) engages into the cylinder cavities of the first cylinder drum unit ( 11, 14 ) while the pistons ( 12 ) of the second group engage into cylinder cavities of the second cylinder drum unit ( 12, 15 ). The first and second cylinder chambers embodied by the pistons ( 10, 12 ) and the cylinder drum units ( 11, 14; 12, 15 ) can be connected to a first hydraulic circuit and a second hydraulic circuit, respectively. The axis of rotation of the first cylinder drum units ( 11, 14 ) and/or the axis of rotation of the second cylinder drum unit ( 12, 15 ) can be adjusted independently of the axis of rotation of the other cylinder drum unit.

1 . Hydrostatic piston machine with a first swash plate on which a first cylinder drum unit is supported, in the cylinder recesses of which unit a first group of pistons is arranged, and with a second swash plate on which a second cylinder drum unit is supported, in the cylinder recesses of which unit a second group of pistons is arranged, wherein the pistons of the first group and the pistons of the second group are connected to a driving shaft of the hydrostatic piston machine in a rotationally rigid manner,
 wherein first cylinder chambers which are formed between the cylinder recesses of the first cylinder drum unit and the pistons of the first group can be connected to a first hydraulic circuit, and   that second cylinder chambers which are formed between the cylinder recesses of the second cylinder drum unit and the pistons of the second group can be connected to a second hydraulic circuit.   
   
   
       2 . Hydrostatic piston machine with a first swash plate on which a first cylinder drum unit is supported, in the cylinder recesses of which unit a first group of pistons is arranged, and with a second swash plate on which a second cylinder drum unit is supported, in the cylinder recesses of which unit a second group of pistons is arranged, wherein the pistons of the first group and the pistons of the second group are connected to a driving shaft of the hydrostatic piston machine in a rotationally rigid manner,
 wherein a first axis of rotation of the first cylinder drum unit and/or a second axis of rotation of the second cylinder drum unit can be adjusted independently of the axis of rotation of the respective other cylinder drum unit.   
   
   
       3 . Hydrostatic piston machine according to  claim 1  or  2 ,
 wherein a respective swash plate, which can be adjusted in two opposite directions from its respective neutral position, is provided in order to adjust the first axis of rotation of the first cylinder drum unit and/or the second axis of rotation of the second cylinder drum unit.   
   
   
       4 . Hydrostatic piston machine according to  claim 1  or  2 ,
 wherein each swash plate co-operates with an adjusting device which executes a linear actuating movement.   
   
   
       5 . Hydrostatic piston machine according to  claim 4 ,
 wherein the linear actuating movement can be executed parallel to the driving shaft.   
   
   
       6 . Hydrostatic piston machine according to  claim 1  or  2 ,
 wherein pressure medium channels are arranged in the respective first and second swash plate in order to connect first cylinder chambers defined by the first cylinder drum unit with the first group of pistons and second cylinder chambers defined by the second cylinder drum unit with the second group of pistons to one or a plurality of hydraulic circuit(s).   
   
   
       7 . Hydrostatic piston machine according to  claim 6 ,
 wherein at least one respective pressure medium channel of the first and of the second swash plate, respectively, opens into a working line channel of a first and second housing flange part, respectively.   
   
   
       8 . Hydrostatic piston machine according to  claim 6 ,
 wherein the first swash plate is mounted in a hydrostatically relieved manner in a first housing flange part and the second swash plate is mounted in a hydrostatically relieved manner in a second housing flange part.   
   
   
       9 . Hydrostatic piston machine according to  claim 8 ,
 wherein the first swash plate is mounted in a sliding manner on a corresponding first bearing surface in the first housing flange part and the second swash plate is mounted in a sliding manner on a corresponding second sliding surface in the second housing flange part.   
   
   
       10 . Hydrostatic piston machine according to  claim 6 ,
 wherein at least one working line connection is in each case provided in the first housing flange part and in the second housing flange part and connected to the working line connections of a respective feed valve unit.   
   
   
       11 . Hydrostatic piston machine according to  claim 10 ,
 wherein the at least one working line connection of the first housing flange part and the at least one working line connection of the second housing flange part are arranged towards one side of the hydrostatic piston machine.   
   
   
       12 . Hydrostatic piston machine according to  claim 6 ,
 wherein the driving shaft is mounted at least by means of a first driving shaft bearing in the first housing flange part and by means of a second driving shaft bearing in the second housing flange part.   
   
   
       13 . Hydrostatic piston machine according to  claim 1  or  2 ,
 wherein the hydrostatic piston machine comprises a first housing flange part, a second housing flange part and at least one further housing part, to which the first and the second housing flange part are connected.   
   
   
       14 . Hydrostatic piston machine according to  claim 11 ,
 wherein a common feed pressure channel is arranged in the first housing flange part, the second housing flange part and the at least one further housing part.