Hydraulic drilling-machine drive

Abstract

The invention pertains to a hydraulic rotary drive for the rotating rod assembly of a drilling machine which contains at least two hydraulic motors ( 1 - 3 ) with the motor shafts ( 34 - 36 ) that are connected to a common output shaft ( 11 ) by means of a gear, with a clutch ( 4 - 6 ) being arranged between the motor shaft ( 34 - 36 ) of each hydraulic motor ( 1 - 3 ) and the gear such that the rotational movement of each hydraulic motor ( 1 - 3 ) can be disengaged from the rotational movement of the output shaft ( 11 ). The invention aims to develop a highly variable rotary drive for ground and rock drilling machines. According to the invention, this objective is attained due to the fact that: (1) the gear is formed by pinions ( 7 - 9 ) that are each connected to a corresponding motor shaft ( 34 - 36 ) by means of a corresponding clutch ( 4 - 6 ), with said pinions engaging a toothed wheel ( 10 ) arranged on the output shaft ( 11 ), and (2) the housings of the hydraulic motors ( 1 - 3 ) have identical connection dimensions, with the hydraulic motors having different intake volumes.

We claim:  
     
         1 . Hydraulic rotary drive for the rotating rod assembly of a drilling machine, with at least two hydraulic motors ( 1 - 3 ) with motor shafts ( 34 - 36 ) that are connected to a common output shaft ( 11 ) by means of a gear, with a clutch ( 4 - 6 ) being arranged between the motor shaft ( 34 - 36 ) of each hydraulic motor ( 1 - 3 ) and the gear such that the rotational movement of each hydraulic motor ( 1 - 3 ) can be disengaged from the rotational movement of the output shaft ( 11 ), characterized by the fact that: 
 the gear is formed by pinions ( 7 - 9 ) that are each connected to a corresponding motor shaft ( 34 - 36 ) by means of a corresponding clutch ( 4 - 6 ), with said pinions engaging a toothed wheel ( 10 ) arranged on the output shaft ( 11 ), and    the housings ( 51 - 53 ) of the hydraulic motors ( 1 - 3 ) have identical connection dimensions, with the hydraulic motors having different intake volumes.    
     
     
         2 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that the toothed wheel ( 10 ) arranged on the output shaft ( 11 ) is accommodated in a housing ( 43 ) that is provided with flange regions ( 44 - 46 ) that are each used to receive a clutch flange ( 48 ).  
     
     
         3 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that the clutch ( 4 - 6 ) is arranged in a clutch housing ( 54 - 56 ) with one end that is realized corresponding to the flange ( 50 ) of the hydraulic motor ( 1 - 3 ) and with the other end that is realized complementary to the motor flange ( 50 ).  
     
     
         4 . Hydraulic rotary drive according to    claim 3   , characterized by the fact that threaded bolts extend through each motor housing ( 51 - 53 ) and the clutch housing ( 54 - 56 ) mounted thereon, with said threaded bolts being arranged within the flange region ( 44 - 46 ) of the toothed wheel housing ( 43 ).  
     
     
         5 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that each pinion ( 7 ) meshing with the toothed wheel ( 10 ) arranged on the output shaft is supported in the clutch housing ( 54 ) and in the housing ( 43 ) that surrounds the toothed wheel ( 10 ).  
     
     
         6 . Hydraulic rotary drive according to    claim 5   , characterized by the fact that a bearing seat which can be enclosed with a cover ( 54 ) is arranged on the side of the toothed wheel housing ( 43 ) opposite each flange region for a clutch housing ( 54 ).  
     
     
         7 . Hydraulic rotary drive according to    claim 6   , characterized by the fact that an axial roller bearing is arranged in the cover ( 47 ).  
     
     
         8 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that each hydraulic motor ( 1 - 3 ) can be charged with hydraulic pressure by a control valve ( 20 - 23 ).  
     
     
         9 . Hydraulic rotary drive according to    claim 8   , characterized by the fact that the clutches ( 4 - 6 ) and the control valves ( 20 - 23 ) can be actuated in a hydraulic fashion, with the control line ( 26 - 28 ) for the actuation of a hydraulic motor ( 1 - 3 ) being coupled to the control line ( 31 - 33 ) for closing the clutch ( 4 - 6 ) assigned to this hydraulic motor ( 1 - 3 ).  
     
     
         10 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that the hydraulic motors ( 1 - 3 ) are supplied with hydraulic operating pressure by the driving pump ( 14 ) through parallel lines.  
     
     
         11 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that a hydraulic circuit which is not dependent on the operating pressure of the hydraulic motors ( 1 - 3 ) and which contains a separate driving pump ( 19 ) is provided for delivering control pressure to the clutch ( 4 - 6 ) and to the control valves ( 20 - 22 ) for the operating pressure of the hydraulic motors ( 1 - 3 ).  
     
     
         12 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that the clutch ( 1 - 3 ) is formed by a friction clutch with coaxial friction linings that can be pressed against one another, in particular, a multi-disk clutch ( 4 ,  5 ,  6 ).  
     
     
         13 . Hydraulic rotary drive according to    claim 12   , characterized by the fact that it comprises a control device, which cuts the supply of hydraulic fluid to one of the hydraulic motors, if the corresponding clutch is not completely closed.  
     
     
         14 . Hydraulic rotary drive    claim 13   , characterized by the fact that the clutches are hydraulically actuated and that the control device cuts the supply of hydraulic fluid to one of the hydraulic motors, if the pressure actuating the corresponding clutch does not reach a threshold value.  
     
     
         15 . Hydraulic rotary drive according to    claim 1   , characterized by the fact that a control device for the load-dependent actuation of at least one hydraulic motor is provided, with said control device charging a hydraulic motor to be actuated with pressure depending on the operating pressure when a first threshold is exceeded and closing the clutch of the corresponding hydraulic motor, and with the control device disconnecting the hydraulic motor from the operating pressure and opening its clutch if a second threshold is not reached.  
     
     
         16 . Hydraulic motor for a hydraulic rotary drive for the rotating rod assembly of a drilling machine, with a motor housing ( 51 ) and a motor shaft ( 34 ) that protrudes out of the axial front end of the motor housing ( 51 ), with the axial front end of the motor housing ( 51 ) containing a mounting flange ( 50 ), characterized by the fact that the rear end of a clutch housing ( 54 ) is mounted on the axial front end of the motor housing ( 5   1 ), with the front end of the clutch housing containing a mounting flange ( 48 ) that corresponds to the mounting flange ( 50 ) of the motor housing ( 5   1 ).  
     
     
         17 . Hydraulic motor according to    claim 16   , characterized by the fact that a multi-disk clutch is accommodated in the clutch housing ( 54 ).  
     
     
         18 . Hydraulic motor according to    claim 16   , characterized by the fact that it is associated with a control device, which cuts the supply of hydraulic fluid if the corresponding clutch is not completely closed.  
     
     
         19 . Hydraulic motor according to    claim 18   , characterized by the fact that the multi-disk clutch can be actuated in a hydraulic fashion, and by the fact that the clutch housing ( 54 ) contains a hydraulic connection ( 41 ).  
     
     
         20 . Hydraulic motor according to    claim 18   , characterized by the fact that the control device cuts the supply of hydraulic fluid if the pressure actuating the corresponding clutch does not reach a threshold value.  
     
     
         21 . Hydraulic motor according to one of    claim 16   , characterized by the fact that a pinion ( 7 ) which is connected to the motor shaft ( 34 ) by means of a clutch protrudes out of the clutch housing ( 54 ) on the side opposite the motor ( 51 ).