Hydraulic rotary motor

Abstract

A hydraulic rotary motor, in particular to a stewing gear for elevating plant such as excavator grabs, etc., comprising a housing in which a rotor is rotatably received as well as a ring piston having an inner toothed arrangement and an outer toothed arrangement which is seated between the rotor and the housing so that displacement chambers are formed between the ring piston and an outer toothed arrangement of the rotor and/or an inner toothed arrangement of the housing, with a first motor connector being rotatably fixedly connected to the housing and a second motor connector being rotatably fixedly connected to the rotor. The hydraulic rotary motor is characterized in that the rotor is axially and radially supported at the housing via plain bearings and the second motor connector connected to the rotor is solely supported via the plain bearings at the housing.

1 . A hydraulic rotary motor, in particular slewing gear for an elevating plant such as excavator grabs, etc., comprising a housing ( 2 ) in which a rotor ( 10 ) is rotatably received as well as a ring piston ( 9 ) having an inner toothed arrangement ( 14 ) and an outer toothed arrangement ( 15 ) which is seated between the rotor ( 10 ) and the housing ( 2 ) so that displacement chambers ( 18 ) are formed between the ring piston ( 9 ) and an outer toothed arrangement ( 16 ) of the rotor ( 10 ) and/or an inner toothed arrangement ( 17 ) of the housing ( 2 ), with a first motor connector ( 23 ) being rotatably fixedly connected to the housing ( 2 ) and a second motor connector ( 20 ) being rotatably fixedly connected to the rotor ( 10 ), characterized in that the rotor ( 10 ) is supported axially and radially at the housing ( 2 ) via plain bearings ( 28 ,  29 ,  30 ,  31 ) and the second motor connector ( 20 ) connected to the rotor ( 10 ) is solely supported via the plain bearings ( 28 ,  29 ,  30 ,  31 ) at the housing ( 2 ). 
   
   
       2 . A rotary motor in accordance with  claim 1 , wherein the rotor ( 10 ) is rigidly seated on a drive shaft ( 32 ) whose end exiting the housing ( 2 ) forms the second motor connector ( 20 ). 
   
   
       3 . A rotary motor in accordance with  claim 1 , wherein the rotor ( 10 ) itself forms the second motor connector ( 20 ). 
   
   
       4 . A rotary motor in accordance with  claim 1 , wherein the rotor ( 10 ) forms a ring. 
   
   
       5 . A rotary motor in accordance with  claim 1 , wherein a rotary brake ( 24 ), in particular a multi-disk brake, is arranged in an inner cut-out ( 24 ) of the rotor ( 10 ). 
   
   
       6 . A rotary motor in accordance  claim 1 , wherein the rotor ( 10 ) has a disk section ( 11 ) which has two axial plain bearing surfaces ( 28 ,  29 ) on oppositely disposed sides with which the rotor ( 10 ) is supported in a housing gap ( 8 ) in which the ring piston ( 9 ) is also arranged and wherein shaft sections ( 12 ,  13 ) of the rotor ( 10 ) projecting axially at both sides at the disk section ( 11 ) or of a drive shaft ( 32 ) rigidly connected to it have radial plain bearing surfaces ( 30 ,  31 ) with which the rotor ( 10 ) is supported at the rims of the housing gap ( 8 ). 
   
   
       7 . A rotary motor in accordance with  claim 1  wherein oil supply passages ( 37 ,  38 ,  39 ,  40 ) are provided in the housing ( 2 ) for the bearing positions of the rotor ( 10 ) which can be fed from a pressure passage for the supply of the displacement chambers ( 18 ). 
   
   
       8 . A rotary motor in accordance with  claim 7 , wherein a first oil supply passage or a set of oil supply passages ( 38 ,  40 ) are provided in the housing ( 2 ) which can be connected to a pressure passage for the supply of the displacement chambers ( 18 ) for reverse action and a second oil supply passage or set of oil supply passages ( 37 ,  39 ) are provided which can be connected to a pressure passage for the supply of the displacement chambers ( 18 ) for forward action. 
   
   
       9 . A rotary motor in accordance with  claim 1 , wherein at least one ring groove ( 37 ,  38 ) is provided in the housing ( 2 ) and is connected to one of the pressure passages for the supply of the displacement chambers ( 18 ). 
   
   
       10 . A rotary motor in accordance with  claim 9 , wherein the at least one ring groove ( 37 ,  38 ) is connected via feed bores ( 39 ,  40 ) to at least one axial plain bearing surface ( 28 ). 
   
   
       11 . A rotary motor in accordance  claim 1 , wherein the at least one ring groove ( 37 ,  38 ) is made open toward an inner peripheral surface of the housing ( 2 ) at which the rotor ( 10 ) and/or the drive shaft ( 32 ) connected thereto is/are radially supported. 
   
   
       12 . A rotary motor in accordance with  claim 9 , wherein the at least one ring groove ( 37 ,  38 ) is made closed completely in the interior of the housing ( 2 ) and is connected via feed bores to at least one bearing support of the rotor ( 10 ) and/or of the drive shaft ( 32 ) connected thereto. 
   
   
       13 . A rotary motor in accordance with  claim 1 , wherein two ring grooves ( 37 ,  38 ) are arranged in planes lying above one another and each have a wave-shaped or S-shaped contour, with the wave-shaped or S-shaped contours of the two ring grooves ( 37 ,  38 ) being arranged offset to one another. 
   
   
       14 . A rotary motor in accordance with  claim 1 , wherein preferably approximately tubular inserts ( 50 ) with infeed openings open to a respective ring passage ( 37 ,  38 ) being inserted into the feed bores. 
   
   
       15 . A rotary motor in accordance with  claim 1 , wherein transverse bores ( 34 ) which open onto the axial bearing surfaces ( 28 ,  29 ) of the rotor ( 10 ) are provided in the meshing noses ( 33 ) of the rotor ( 10 ). 
   
   
       16 . A rotary motor in accordance  claim 1 , wherein plate-shaped pressure pockets are formed in the axial plain bearing surfaces ( 28 ,  29 ) of the rotor ( 10 ). 
   
   
       17 . A rotary motor in accordance with  claim 1 , wherein distributor grooves ( 35 ) connected to the transverse bores ( 34 ) are provided in the axial plain bearing surfaces ( 28 ,  29 ). 
   
   
       18 . A rotary motor in accordance with  claim 1 , wherein the ring piston ( 9 ) has a thickness reducing toward the rims of its outer toothed arrangement ( 15 ). 
   
   
       19 . A rotary motor in accordance with  claim 18 , wherein bevels ( 45 ) toward the displacement chambers ( 18 ) are provided at the rims of the ring piston ( 9 ). 
   
   
       20 . A rotary motor in accordance with  claim 1 , wherein axial grooves, preferably displaced by 180—with respect to one another, are provided in the radial plain bearing surfaces of the housing ( 2 ) and/or of the rotor ( 10 ) and/or of the shaft ( 32 ) connected thereto. 
   
   
       21 . A rotary motor in accordance with  claim 1 , wherein at least one compensation bore is provided between a radial plain bearing surface and an oil leakage space ( 43 ) between the ring piston ( 9 ) and the housing ( 2 ). 
   
   
       22 . A rotary motor in accordance with  claim 10 , wherein the at least one ring groove ( 37 ,  38 ) is made closed completely in the interior of the housing ( 2 ) and is connected via feed bores to at least one bearing support of the rotor ( 10 ) and/or of the drive shaft ( 32 ) connected thereto.