# US 9,752,472 B2 · Oil pump, engine cover and engine comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,472 B2 - Document ID: US9752472B2 - Status: Granted - Kind: B2 - Application number: 14/380,056 - Filed: 2013-03-28 - Published: 2016-03-24 - Granted: 2017-09-05 - Earliest claimed: 2012-03-29 - Assignees: Shenzhen BYD Auto R&D Company Limited; BYD Company Limited - Applicants: Shenzhen BYD Auto R&D Company Limited; BYD Company Limited - Inventors: Junli Zheng; Jing Liu; Haibin Li; Jinchen Lin - Web page: https://patentgrep.com/patent/US9752472B2 ## CPC - F01M 1/02: using lubricating pumps (pumps in general F04; lubricating pumps per se F16N) - F04C 2/084: {Toothed wheels} - F04C 2/086: {Carter} - F04C 2/102: {the two members rotating simultaneously around their respective axes} - F04C 14/26: using bypass channels - F04C 15/06: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04C 29/0042: {Driving elements, brakes, couplings, transmissions specially adapted for pumps (brakes, couplings, transmissions per se F16, B60)} - F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) - F04C 29/025: {using a lubricant pump} - F04C 29/028: {Means for improving or restricting lubricant flow} - F04C 29/04: Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00) - F16N 13/20: Rotary pumps (with distributing equipment F16N13/22) - F01M 2001/0238: {Rotary pumps} - F01M 2001/0284: {mounting of the pump} - F02F 2007/0075: {Front covers} - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F16N: LUBRICATING - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES ## Abstract An oil pump is provided. The oil pump comprises a shell, a rotor mounting part on the shell, and a rotor mechanism disposed on the rotor mounting part. The shell has an inlet and an outlet and defines a low-pressure oil chamber and a high-pressure oil chamber therein. A buffer chamber is defined between the low-pressure oil chamber and the high-pressure oil chamber, and a barrier wall is disposed between the buffer chamber and the low-pressure oil chamber. An engine cover comprising the oil pump and an engine comprising the engine cover are also provided. ## Claims ### Claim 1 An oil pump, comprising: a shell having an inlet and an outlet and defining a low-pressure oil chamber and a high-pressure oil chamber therein, the low-pressure oil chamber having a low-pressure oil passage connected to the inlet, and the high-pressure oil chamber having a high-pressure oil passage connected to the outlet; a rotor mounting part on the shell and having a rotor supporting structure; and a rotor mechanism disposed on the rotor mounting part, wherein a buffer chamber is defined between the low-pressure oil chamber and the high-pressure oil chamber, and a barrier wall is disposed between the buffer chamber and the low-pressure oil chamber. ### Claim 2 (depends on 1) The oil pump according to claim 1, wherein the barrier wall is disposed at a side of the inlet and parallel to an inflowing direction of an oil flowing into the low-pressure chamber through the inlet. ### Claim 3 (depends on 1) The oil pump according to claim 1, wherein a top end face of the barrier wall is a circular arc surface. ### Claim 4 (depends on 1) The oil pump according to claim 1, further comprising a flow limiting wall disposed in the buffer chamber, wherein the flow limiting wall divides the buffer chamber into an inflowing buffer chamber and an outflowing buffer chamber connected to the inflowing buffer chamber via a pressure relief mechanism. ### Claim 5 (depends on 4) The oil pump according to claim 4, wherein the shell comprises a main shell body and a cover joined with the main shell body, the inlet and outlet formed in the cover; wherein the flow limiting wall comprises a first flow limiting wall portion formed on the cover, and a second flow limiting wall portion formed on the main shell body; wherein a through hole connecting the inflowing buffer chamber and the outflowing buffer chamber is formed in the flow limiting wall, and the pressure relief mechanism is disposed in the through hole. ### Claim 6 (depends on 4) The oil pump according to claim 4, wherein the outflowing buffer chamber further comprises a pressure relief channel adapted to change an outflowing direction, the pressure relief channel comprising first and second pressure relief ports disposed symmetrically to each other. ### Claim 7 (depends on 6) The oil pump according to claim 6, wherein the first and second pressure relief ports each has a right-angled trapezoid shaped cross-section. ### Claim 8 (depends on 1) The oil pump according to claim 1, further comprising a partition wall disposed between the low-pressure oil chamber and the high-pressure oil chamber for separating the low-pressure oil chamber and the high-pressure oil chamber. ### Claim 9 (depends on 8) The oil pump according to claim 8, wherein the partition wall comprises a main body portion adjacent to the outlet, and an extending portion extending from the main body portion to the rotor mounting part. ### Claim 10 (depends on 9) The oil pump according to claim 9, wherein a side of the extending portion facing to the high pressure oil chamber is tilted. ### Claim 11 (depends on 8) The oil pump according to claim 8, wherein the partition wall comprises a bolt hole formed at an end of the partition wall adjacent to the rotor mounting part. ### Claim 12 (depends on 11) The oil pump according to claim 11, wherein a width of the partition wall is 1.5 to 2 times of the maximum value of a diameter of the bolt hole. ### Claim 13 An engine cover, comprising: an engine cover body, and an oil pump disposed on the engine cover body, the oil pump further including: a shell having an inlet and an outlet and defining a low-pressure oil chamber and a high-pressure oil chamber therein, the low-pressure oil chamber having a low-pressure oil passage connected to the inlet, and the high-pressure oil chamber having a high-pressure oil passage connected to the outlet; a rotor mounting part on the shell and having a rotor supporting structure; and a rotor mechanism disposed on the rotor mounting part, wherein a buffer chamber is defined between the low-pressure oil chamber and the high-pressure oil chamber, and a barrier wall is disposed between the buffer chamber and the low-pressure oil chamber and the shell of the oil pump is integral with the engine cover. ### Claim 14 (depends on 13) An engine comprising an engine cover according to claim 13.