Patent ID: 9328733
Filing Date: 2016-05-03
CPC Classification: F04C

Claim Text:
1. A vacuum pump of a vehicle for reducing operation noise, comprising: a rotor rotating in a space defined by a housing formed in a pump body at an eccentric position relative to a center of the space; a vane installed to the rotor to rotate eccentrically in the space; and an oil outlet passing through the pump body and formed at a predetermined height above a lower limit of the space such that, when lubricant having been introduced into the space is discharged in a pressurized state by the vane, the lubricant is not reintroduced back into the space by gravity, wherein a back surface of the oil outlet opposite to an installation portion of the rotor and the vane is provided with a discharge valve which comprises: a plate valve rotating by pressure of lubricant discharged through the oil outlet; and a valve stopper limiting a rotation angle of the plate valve, wherein the valve stopper is formed on a surface of the discharge valve and has a vent groove, and wherein the vent groove has a depth of 0.2 mm to 0.6 mm and a width of 1.2 mm to 1.6 mm.