Oil pump module having an oil pump module housing

Abstract

An oil pump module is provided that has an oil pump module housing. The oil pump module is situated in an oil pan of an internal combustion engine below a crankshaft. Moving parts of an oil pump and an angular momentum balance shaft are situated in the oil pump module housing. A rotor of the oil pump is situated on a rotor shaft, which is separate from the angular momentum balance shaft, in the oil pump module housing. The rotor shaft is mechanically connected via a spur gear transmission in the oil pump module housing to the angular momentum balance shaft.

1 . An oil pump module, comprising:
 an oil pump module housing;   an oil pan of an internal combustion engine below a crankshaft;   an oil pump;   a plurality of moving parts of the oil pump situated in the oil pump module housing;   an angular momentum balance shaft situated in the oil pump module housing;   a rotor shaft that is separate from the angular momentum balance shaft;   a rotor of the oil pump that is situated on the rotor shaft in the oil pump module housing; and   a spur gear transmission in the oil pump module housing mechanically connecting the rotor shaft to the angular momentum balance shaft.   
     
     
         2 . The oil pump module according to  claim 1 , further comprising a drive chain gearwheel that is mechanically connected via a chain drive to the crankshaft and situated on the rotor shaft outside the oil pump module housing. 
     
     
         3 . The oil pump module according to  claim 1 , wherein an intake opening of the oil pump of the oil pump module is immersed in an oil sump of the oil pan. 
     
     
         4 . The oil pump module according to  claim 1 , wherein the oil pump is a two-stage oil pump configured to supply plain bearings in an engine compartment. 
     
     
         5 . The oil pump module according to  claim 2 , wherein the oil pump module comprises a drive shaft on which the drive chain gearwheel is situated in a rotationally-fixed manner outside the oil pump module housing, and the drive shaft comprises a drive gearwheel of the spur gear transmission to the angular momentum balance shaft between two shaft bearings inside the oil pump module housing. 
     
     
         6 . The oil pump module according to  claim 2 , further comprising two balance weights are situated between two shaft bearings on the angular momentum balance shaft that compensate for an unbalance due to torque pulses of the internal combustion engine. 
     
     
         7 . The oil pump module according to  claim 1 , wherein the angular momentum balance shaft is situated as an output shaft having output gearwheel in relation to the rotor shaft having drive gearwheel in the oil pump module housing. 
     
     
         8 . The oil pump module according to  claim 7 , wherein the output gearwheel of the angular momentum balance shaft is configured to mesh with the drive gearwheel of the rotor shaft of the oil pump in the oil pump module housing. 
     
     
         9 . The oil pump module according to  claim 2 , wherein a transmission ratio of the spur gear transmission that is situated in the oil pump module housing is configured such that in consideration of the transmission ratio of the chain drive situated outside the oil pump module housing, a speed of the angular momentum balance shaft is equal to a second speed of the crankshaft for three-cylinder engines and is twice as high as the second speed of the crankshaft for four-cylinder engines. 
     
     
         10 . The oil pump module according to  claim 2 , wherein a step-down transmission ratio of the chain drive defines a rotor speed of the rotor of the oil pump. 
     
     
         11 . The oil pump module according to  claim 2 , wherein a step-up transmission ratio of the chain drive defines a rotor speed of the rotor of the oil pump. 
     
     
         12 . The oil pump module according to  claim 1 , wherein for a three-cylinder engine, a speed of the rotor of the oil pump is less than a second speed of the crankshaft of the three-cylinder engine.