Device for pressurizing a fluid, to be directly mounted on a power take-off

Abstract

The disclosure relates to a device for pressurising a fluid to be combined with a rotary power takeoff of a vehicle including a casing and at least one multiplication stage, the device including a frame bearing at least one first rotatably moveable shaft bearing a member for moving the fluid and dynamic coupling means for coupling the shaft to the power takeoff. The frame includes means for bearing and attaching to the casing and the coupling means are arranged so as to directly connect the mobile shaft to the multiplication stage of the power takeoff. The disclosure also relates to a device for pressurising a fluid, including a frame, rotatably moveable first and second shafts each bearing a member for moving the fluid, and dynamic coupling means for coupling the first or second shaft to the power takeoff, including a removable pinion that can be alternately mounted on the first or second shaft. Finally, the disclosure also relates to a system including a power takeoff and to a device for pressurising a fluid.

1 . A fluid pressurizing device ( 1 ), to be associated with a rotary power take-off ( 2 ) of a motor vehicle including a casing ( 3 ) and at least a multiplication stage ( 4 ), said device comprising a frame ( 5 ) supporting at least a first rotatably movable shaft ( 6   a,    6   b ) bearing a member for moving the fluid, and dynamic coupling means ( 7 ) for dynamically coupling the shaft ( 6   a,    6   b ) to the power take-off ( 2 ), said device being characterized in that the frame ( 5 ) comprises means for supporting and attaching to the casing ( 3 ) and in that said coupling means ( 7 ) are arranged to directly connect the movable shaft ( 6   a,    6   b ) to the multiplication stage ( 4 ) of the power take-off. 
     
     
         2 . A device according to  claim 1 , characterized in that it comprises no other multiplication stage than that of the power take-off. 
     
     
         3 . A device according to the  claim 1  or  2 , characterized in that the coupling means comprise a pinion ( 7 ) borne by the first movable shaft ( 6   a,    6   b ). 
     
     
         4 . A device according to any one of  claims 1  to  3 , characterized in that the attaching means comprise a peripheral mounting flange ( 8 ), to be disposed against the casing ( 3 ) of the power take-off ( 2 ). 
     
     
         5 . A device according to  claim 4 , characterized in that the mounting flange comprises a cradle shaped portion so as to allow the passage of the multiplication stage ( 4 ) of the power take-off. 
     
     
         6 . A device according to one of  claims 1  to  5 , characterized in that the attaching means comprise centering and positioning means. 
     
     
         7 . A device according to one of  claims 1  to  6 , characterized in that it comprises an internal lubricating circuit and means for the connection of the internal circuit to a motor vehicle lubricating circuit. 
     
     
         8 . A device according to  claim 7 , characterized in that the connecting means comprise a supply opening ( 19 ) extending in the axis of rotation C of the multiplication stage ( 4 ) of the power take-off ( 2 ) so as to allow a supply of the lubricant by the support shaft of said multiplication stage ( 4 ). 
     
     
         9 . A device according to one of  claims 7  and  8 , characterized in that the internal lubricating circuit comprises a filter ( 21 ). 
     
     
         10 . A device according to one of  claims 1  to  9 , characterized in that it has a mass and dimensions arranged so that the loads applied by the device, associated with the power take-off, are lower than the permissible loads at the junction of the power take-off on a gear box. 
     
     
         11 . A device according to any of  claims 1  to  10 , characterized in that it comprises a first ( 6   a ) and a second ( 6   b ) movable, parallel shafts, respectively bearing a first and a second compression screws and means for synchronizing the rotation of the shafts. 
     
     
         12 . A device according to  claim 11 , characterized in that the synchronization means comprise a first ( 11   a ) and a second ( 11   b ) gear wheels respectively borne by the first ( 6   a ) and the second ( 6   b ) shafts and cooperating with each other. 
     
     
         13 . A device according to one of  claims 11  and  12 , characterized in that the coupling means forming pinion ( 7 ) can be alternatively supported by the first ( 6   a ) or the second ( 6   b ) shaft and in that the second shaft ( 6   b ) like the first shaft ( 6   a ), is arranged so as to be directly coupled to the multiplication stage ( 4 ) of the power take-off ( 2 ) when it bears said pinion ( 7 ). 
     
     
         14 . A fluid pressurizing device ( 1 ) to be associated with a rotary power take-off ( 2 ) of a motor vehicle including a casing ( 3 ), said device comprising a frame ( 5 ), a first and a second rotatably movable shafts ( 6   a,    6   b ) each bearing a member for moving the fluid, means for the synchronizing the rotation of the first and second shafts arranged to drive the first shaft ( 6   a ) into a first rotation direction and the second shaft ( 6   b ) into a second rotation direction; and means for dynamically coupling the first or the second shaft ( 6   a,    6   b ) to the power take-off ( 2 ), said device being characterized in that said coupling means ( 7 ) comprise a removable pinion ( 7 ) to be mounted either on the first ( 6   a ) or on the second ( 6   b ) shaft, depending on the rotation direction of said power take-off, so as to drive the first shaft in the first rotation direction and the second shaft in the second rotation direction, regardless of the rotation direction of said power take-off ( 2 ). 
     
     
         15 . A device according to  claim 14 , to be associated with a power take-off ( 2 ) provided with at least a multiplication stage ( 4 ), characterized in that said coupling means ( 7 ) are arranged so as to directly connect the movable shaft ( 6   a,    6   b ) to the multiplication stage ( 4 ) of the power take-off. 
     
     
         16 . A device according to  claim 14  or  15 , characterized in that frame ( 5 ) comprises means for supporting and attaching to the casing ( 3 ). 
     
     
         17 . A device according to one of  claims 14  to  16 , characterized in that the attaching means comprise a peripheral mounting flange ( 8 ), to be disposed against the casing ( 3 ) of the power take-off ( 2 ). 
     
     
         18 . A device according to  claim 17 , characterized in that the mounting flange comprises a cradle shaped portion to allow the passage of the power take-off multiplication stage ( 4 ). 
     
     
         19 . A device according to one of  claims 16  to  18 , characterized in that the attaching means comprise centering and positioning means. 
     
     
         20 . A device according to one of  claims 1  to  19 , characterized in that it comprises an internal lubricating circuit and means for connecting the internal circuit to a motor vehicle lubricating circuit. 
     
     
         21 . A device according to one of  claims 14  to  20 , characterized in that the synchronization means comprise a first ( 11   a ) and a second ( 11   b ) gear wheels respectively borne by the first ( 6   a ) and the second ( 6   b ) shafts and cooperating with each other. 
     
     
         22 . A device according to one of  claims 1  to  21 , characterized in that the synchronization means have a multiplication ratio of about 1.2. 
     
     
         23 . A system comprising a rotary power take-off ( 2 ) including a casing ( 3 ) and a fluid pressurizing device according to one of  claims 1  to  22 , associated to said casing ( 3 ).