Patent ID: 8651829

Claim:
A vacuum pump for vehicles comprising: a motor housing provided with an air inlet through which air is sucked; a pump unit disposed on the motor housing to generate a vacuum using the air sucked through the air inlet; and the pump unit comprising a rotor unit rotated by driving force generated from a motor; a cam ring into which the rotor unit is inserted; a base plate installed under the cam ring, and provided with a suction hole and a discharge hole; and an upper plate installed on the cam ring to cover the upper surface of the rotor unit, a chamber unit, the inside of which is divided, disposed on the pump unit, wherein the chamber unit includes: an inner cap to cover the upper portion of the pump unit; and an outer cap to cover the upper portion of the inner cap, wherein the inner cap and the outer cap are communicated with each other, wherein the inner cap includes at least one opening to move exhaust air generated from the pump unit to the outer cap, wherein a volume of a space between the inner cap and the outer cap is larger than a volume of a passage of the at least one opening of the inner cap so that the exhausted air from the inner cap is diffused.