Water pump at a portable cutting machine

Abstract

The invention concerns a portable cutting machine ( 1 ), comprising a cutter unit ( 3 ) with a rotatable cutter member ( 4 ) in the form of a cutter disc or a saw disc, a cutter shaft for the rotation of the cutter member, a guard in the form of a protective housing ( 11 ) for said cutter member, at least one water nozzle ( 12 ) provided in the protective housing for the generation of one or more water jets in the space defined by the protective housing, said one or more water jets essentially laying the dust which is generated during the cutting operation and cooling the cutter member, the machine further comprising a power unit ( 2 ) and a first power transmission ( 7 ) between the power unit and the cutter shaft. The machine is characterized in that a water pump ( 20 ) is provided in or on the cutter unit ( 3 ) or inside a casing ( 9 ), which covers at least parts of said power transmission, and that the pump is powered directly by members belonging to said first power transmission or by the cutter shaft or indirectly by said members belonging to said first power transmission or by the cutter shaft

1 . Portable cutting machine ( 1 ), comprising a cutter unit ( 3 ) with a rotatable cutter member ( 4 ) in the form of a cutter disc or a saw disc, a cutter shaft for the rotation of the cutter member, a guard in the form of a protective housing ( 11 ) for said cutter member, at least one water nozzle ( 12 ) provided in the protective housing for the generation of one or more water jets in the space defined by the protective housing, said one or more water jets essentially laying the dust which is generated during the cutting operation and cooling the cutter member, the machine further comprising a power unit ( 2 ) and a first power transmission ( 7 ) between the power unit and the cutter shaft, characterized in that a water pump ( 20 ) is provided in or on the cutter unit ( 3 ) or inside a casing ( 9 ), which covers at least parts of said power transmission, and that the pump is powered directly by members belonging to said first power transmission or by the cutter shaft or indirectly by said members belonging to said first power transmission or by the cutter shaft.  
     
     
         2 . Cutting machine according to  claim 1 , characterized in that said power transmission comprises a first driving belt ( 7 ) and a first belt pulley ( 8 ) or a first groove on a double belt pulley on the cutter shaft, and that the pump is driven via a second belt pulley or a second groove on said double belt pulley via a second driving belt ( 25 ).  
     
     
         3 . Cutting machine according to  claim 2 , characterized in that the pump is mounted in a front belt protection included in the cutter unit.  
     
     
         4 . Cutting machine according to  claim 1 , characterized in that the cutter shaft is journalled in at least two ball bearings in a carrier for the cutter member and that the pump ( 20 ) is driven via a gear wheel or a worm gear, which is mounted between ball bearings on the cutter shaft.  
     
     
         5 . Cutting machine according to  claim 1 , wherein the cutter member is mounted between an inner- and an outer flange washer, characterized in that the pump is mounted inside the inner flange washer and is driven by the cutter shaft.  
     
     
         6 . Cutting machine according to  claim 1 , characterized in that the pump is provided in a front belt protection and is driven via a driving member connected to a belt pulley for driving the cutter member or to a nut which secures the belt pulley on the cutter shaft.  
     
     
         7 . Cutting machine according to  claim 1 , wherein the cutter shaft is driven by the power unit via a driving belt ( 7 ) between a rear driving wheel and a front belt pulley ( 8 ), characterized in that the pump is driven via a belt pulley mounted between the rear driving wheel and the front belt pulley ( 8 ).  
     
     
         8 . Cutting machine according to  claim 7 , characterized in that the pump is integrated with said belt pulley which is provided between the rear driving wheel and the front belt pulley.  
     
     
         9 . Cutting machine according to  claim 1 , wherein the power unit comprises a crank-shaft, which drives a driving belt ( 7 ) included in said first powered transmission via a centrifugal clutch which is covered by a clutch casing ( 9 ), characterized in that the pump ( 20 ) is provided inside the clutch casing.  
     
     
         10 . Cutting machine according to  claim 9 , characterized in that the pump is driven from the crank-shaft via a worm gear or via a belt transmission.