Oil pump for a motor vehicle
View Patent ↗An oil pump for a motor vehicle, in particular an electrically operated gear pump, contains a pump housing that is closed relative to an end side by a housing cover, a shaft which extends in a longitudinal direction and to which a pump wheel is secured. The shaft is mounted on a first bearing and on a second bearing on both sides of the pump wheel. A pressure chamber is formed on a pressure side, and a lubricant channel leads from the pressure chamber to the shaft in a region of the first bearing for the lubrication of the two bearings. Between the shaft and the pump wheel secured to the shaft, at least one longitudinal channel also leads along the pump wheel to the second bearing.
1 . An oil pump for a motor vehicle, the oil pump comprising:
a housing cover having a pressure chamber and a lubricant channel formed therein;
a pump housing being closed in a direction toward an end face by said housing cover;
a pump wheel having at least one longitudinal channel formed therein;
bearings including a first bearing and a second bearing; and
a shaft extending in a longitudinal direction and to which said pump wheel is secured, wherein said shaft is supported at both sides of said pump wheel on said first bearing and on said second bearing, wherein at a pressure side said pressure chamber is formed, and in order to lubricate said bearings oil from said pressure chamber is guided thru said lubricant channel to said shaft in a region of said first bearing, wherein said at least one longitudinal channel is between said shaft and said pump wheel which is secured to said shaft, oil is further guided along said at least one longitudinal channel in said pump wheel up to said second bearing.
2 . The oil pump according to claim 1 , wherein said at least one longitudinal channel is one of a plurality of longitudinal channels formed in said pump wheel around said shaft.
3 . The oil pump according to claim 1 , wherein said at least one longitudinal channel is in a form of a groove in said pump wheel.
4 . The oil pump according to claim 1 , wherein said pump wheel is in a form of a gear and said at least one longitudinal channel is disposed in a circumferential region of said pump wheel, said pump wheel further has a tooth.
5 . The oil pump according to claim 1 , wherein said pressure chamber is formed in said housing cover and said lubricant channel is formed in a radial direction toward said shaft.
6 . The oil pump according to claim 1 , wherein said lubricant channel is in a form of a groove in said housing cover.
7 . The oil pump according to claim 1 , wherein in a region of said second bearing, said pump housing has a further chamber formed therein which is open in a direction toward said shaft to collect oil which is supplied via said at least one longitudinal channel.
8 . The oil pump according to claim 7 , wherein said further chamber is in a form of a recess formed in said pump housing.
9 . The oil pump according to claim 1 , wherein said bearings are in a form of plain bearings.
10 . The oil pump according to claim 1 , further comprising an electric motor driving said shaft and said second bearing is orientated in a direction toward said electric motor, wherein said second bearing is configured such that during operation a leakage flow of oil used to lubricate said second bearing reaches said electric motor and cools said electric motor.
11 . The oil pump according to claim 1 , wherein the oil pump is a gerotor pump having said pump wheel as an externally toothed inner rotor.
12 . The oil pump according to claim 1 , where the oil pump is an electrically driven gear pump.