Drive Unit For A Mowing Sickle

Abstract

A drive unit for an oscillatingly driven mowing sickles has a first transmission unit with a first housing defining a first axis. A rotor is rotationally supported in the first housing around the first axis. A first internal gear wheel is retained in the first housing. The internal gear wheel has internal teeth. A pinion is rotationally supported in the rotor around a second axis. The second axis is radially off-set to the first axis. The pinion forms an output element of the drive unit and meshes with the first internal gear wheel. A mowing sickle is coupled with said output element of said first transmission unit. A second transmission unit has an output non-rotationally connected to the rotor of the first transmission unit. The output is formed as a step-down gear. A motor with an output shaft rotationally drives the second transmission unit. The motor provides a rotational speed that is reduced by the second transmission unit, formed as a step-down gear, to the rotational driving speed of the first transmission unit. The motor defines a drive axis positioned coaxially or parallel to the first axis of the first transmission.

1 - 17 . (canceled) 
     
     
         18 . A drive unit for oscillatingly driven mowing sickles comprising:
 a first transmission unit having a first housing defining a first axis, a rotor rotationally supported in the first housing around the first axis, a first internal gear wheel retained in the first housing, said internal gear wheel providing internal teeth, a pinion rotationally supported in the rotor around a second axis, said second axis is radially off-set to the first axis, said pinion forms an output element of the drive unit and meshes with the first internal gear wheel;   a mowing sickle coupled with said output element of said first transmission unit;   a second transmission unit having an output non-rotationally connected to the rotor of the first transmission unit, said output formed as a step-down gear;   a motor having an output shaft rotationally driving the second transmission unit, said motor providing a rotational speed which is reduced by the second transmission unit, formed as a step-down gear, to the rotational driving speed of the first transmission unit; and   said motor defining a drive axis positioned coaxially or parallel to the first axis of the first transmission.   
     
     
         19 . The drive unit according to  claim 18 , wherein the second transmission is formed as a spur gear arrangement. 
     
     
         20 . The drive unit according to  claim 19 , wherein the second transmission unit comprises a spur gear non-rotationally connected to the rotor of the first transmission unit, said spur gear rotates with the rotor around the first axis, and the second transmission further comprises a spur pinion gear meshing with the spur gear, said spur pinion rotates around a fourth axis arranged parallel to the first axis and is driven by the motor. 
     
     
         21 . The drive unit according to  claim 19 , wherein the motor is arranged parallel to and next to the first transmission unit. 
     
     
         22 . The drive unit according to  claim 21 , wherein a flywheel is provided being connected to the spur pinion gear for rotation, said flywheel is arranged on the side of the second transmission unit and of the motor facing away from the first transmission unit. 
     
     
         23 . The drive unit according to  claim 19 , wherein the motor is positioned parallel to the second transmission unit and faces away from the first transmission unit. 
     
     
         24 . The drive unit according to  claim 23 , wherein a flywheel is coupled with the spur pinion gear for rotation, said flywheel is arranged on the side of the second transmission unit, facing the first transmission unit, next to the first transmission unit. 
     
     
         25 . The drive unit according to  claim 19 , wherein the second transmission unit has a second housing attached on the first housing of the first transmission unit or is formed with the first housing as at least partially a unit. 
     
     
         26 . The drive unit according to  claim 18 , wherein the motor is a hydraulic motor or an electromotor.