# US 8,651,829 B2 · Vacuum pump for vehicles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,651,829 B2 - Document ID: US8651829B2 - Status: Granted - Kind: B2 - Application number: 12/818,043 - Filed: 2010-06-17 - Published: 2010-12-23 - Granted: 2014-02-18 - Earliest claimed: 2009-06-18 - Assignees: Kamtec Inc. - Applicants: Chang Sik Lim; Ki Ho Jung; Jang Ho Lee; Byung Jun Byun - Inventors: Chang Sik Lim; Ki Ho Jung; Jang Ho Lee; Byung Jun Byun - Web page: https://patentgrep.com/patent/US8651829B2 ## CPC - F04C 25/02: for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06) - F01C 21/108: {with an axial surface, e.g. side plates} - F04C 29/04: Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00) - F04C 29/066: {with means to enclose the source of noise} - F04C 29/12: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04C 18/3441: {the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation} - F04C 29/065: {Noise dampening volumes, e.g. muffler chambers} - F04C 2240/30: Casings or housings - Y10T 137/6855: Vehicle - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Disclosed is a vacuum pump for vehicles which reduces noise of exhaust air generated during operation of the vacuum pump. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein the inner cap and the outer cap are made of different materials. ### Claim 3 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein the inner cap is made of aluminum, and the outer cap is made of any one of plastic and stainless steel. ### Claim 4 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein the at least one opening includes a center hole formed at the center of the inner cap, and side holes separated from each other in the circumferential direction of the upper surface of the inner cap. ### Claim 5 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein the outer cap includes support ribs disposed concentrically around the center of the inner surface of the outer cap. ### Claim 6 (depends on 5) The vacuum pump for vehicles according to claim 5, wherein the outer cap further includes connection members to connect the support ribs at a regular interval. ### Claim 7 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein: the inner cap is disposed to have one separation distance from the outer surface of the pump unit; and the outer cap is disposed to have another separation distance from the outer surface of the inner cap. ### Claim 8 (depends on 1) The vacuum pump for vehicles according to claim 1, further comprising a packing member between the pump unit and the motor housing to reduce vibration and to prevent air leakage. ### Claim 9 (depends on 1) The vacuum pump for vehicles according to claim 1, wherein the motor housing includes alignment members separated from each other at the same interval on the upper surface of the motor housing to achieve positional alignment of the pump unit. ### Claim 10 (depends on 7) The vacuum pump for vehicles according to claim 7, wherein each of the alignment members includes: a first guide part rounded toward the center of the motor housing; and a second guide part bent to face the outside of the motor housing. ### Claim 11 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 disposed on the pump unit to reduce at least noise or heat generated during operation of 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; and wherein a volume of a passage 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. ### Claim 12 (depends on 11) The vacuum pump for vehicles according to claim 11, wherein the motor housing includes a cap, with which a controller to control the motor is integrated, mounted on the lower portion of the motor housing. ### Claim 13 (depends on 12) The vacuum pump for vehicles according to claim 12, wherein the cap includes: an upper region, in which first electronic elements are disposed, provided in an upper area centering around the controller; and a lower region, in which second electronic elements operated at a higher-temperature state than the first electronic elements are disposed, provided in a lower area centering around the controller. ### Claim 14 (depends on 12) The vacuum pump for vehicles according to claim 12, wherein the cap includes an open hole provided with an opened lower surface. ### Claim 15 (depends on 12) The vacuum pump for vehicles according to claim 12, wherein the controller radiates heat generated during operation of the controller through the inside of the cap to exterior.