# US 2017/0254331 A1 · Compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0254331 A1 - Document ID: US20170254331A1 - Status: Published application - Kind: A1 - Application number: 15/506,207 - Filed: 2015-08-28 - Published: 2017-09-07 - Earliest claimed: 2014-09-01 - Assignees: Daikin Industries, Ltd. - Applicants: Daikin Industries, Ltd. - Inventors: Masahiro NORO; Yasuhiro MURAKAMI; Kouji TANAKA - Web page: https://patentgrep.com/patent/US20170254331A1 ## CPC - F04C 29/0057: {for eccentric movement} - F04C 18/0215: {where only one member is moving} - F04C 23/008: {Hermetic pumps} - F04C 23/02: Pumps characterised by combination with, or adaptation to, specific driving engines or motors - F04C 29/0085: {Prime movers} - F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) - F04C 29/026: {Lubricant separation} - F04C 2240/40: Electric motor - F04C 2240/807: Balance weight, counterweight - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A compressor includes a crankshaft, an electric motor, a counterweight, and an oil outflow reduction member. The electric motor has a rotor coupled to the crankshaft and a stator in which the rotor is housed with an air gap formed between the stator and the rotor. The counterweight is disposed adjacent to the rotor and is integrated with the crankshaft. The oil outflow reduction member encloses an upper side, a lower side, and a lateral side of a counterweight passing space. The counterweight passing space is a space through which at least part of the counterweight passes when the crankshaft rotates 360°. ## Claims ### Claim 1 A compressor comprising: a crankshaft; an electric motor having a rotor coupled to the crankshaft and a stator in which the rotor is housed with an air gap formed therebetween; a counterweight being disposed adjacent to the rotor and being integrated with the crankshaft; and an oil outflow reduction member enclosing an upper side, a lower side, and a lateral side of a counterweight passing space through which at least part of the counterweight passes when the crankshaft rotates 360°, the oil outflow reduction member preventing inflow of oil into the counterweight passing space, the oil outflow reduction member being formed in a cylinder shape extending in an axial direction of the crankshaft. ### Claim 2 (depends on 1) The compressor according to claim 1, wherein the oil outflow reduction member rotates integrally with the crankshaft. ### Claim 3 (canceled) ### Claim 4 (depends on 1) The compressor according to claim 1, wherein the oil outflow reduction member includes a disc which encloses a rotor side of the counterweight passing space, and the counterweight and the disc are formed integrally with the crankshaft. ### Claim 5 (depends on 1) The compressor according to claim 1, wherein the oil outflow reduction member includes a disc which encloses a rotor side of the counterweight passing space, and the disc is formed in an annular shape and is formed as a member separate from the crankshaft. ### Claim 6 (depends on 5) The compressor according to claim 5, wherein the counterweight includes a first counterweight formed integrally with the disc and being disposed on the rotor side; and a second counterweight formed integrally with the crankshaft and being coupled to the first counterweight by a fastening member, and the fastening member is disposed so the fastening member does not project on the rotor side from the disc. ### Claim 7 (depends on 4) The compressor according to claim 4, wherein the oil outflow reduction member includes a cover, which encloses the lateral side of the counterweight passing space and a distal side of the counterweight passing space distal from the rotor in the axial direction of the crankshaft. ### Claim 8 (depends on 7) The compressor according to claim 7, wherein the counterweight is disposed above the rotor, and a gap is formed between the disc and the cover in at least part of an area between the disc and the cover. ### Claim 9 (depends on 8) The compressor according to claim 8, wherein an outer diameter of the disc is larger than an outer diameter of the rotor formed in a cylinder shape, and is smaller than an inner diameter of the stator in which the rotor is housed. ### Claim 10 (depends on 4) The compressor according to claim 4, wherein a radius of the disc is identical to a radius of the counterweight formed in a semicircular shape. ### Claim 11 (depends on 4) The compressor according to claim 4, wherein an outer diameter of the disc is equal to or smaller than the outer diameter of the rotor formed in a cylinder shape. ### Claim 12 (canceled) ### Claim 13 (depends on 2) The compressor according to claim 2, wherein the oil outflow reduction member includes a disc which encloses a rotor side of the counterweight passing space, and the counterweight and the disc are formed integrally with the crankshaft. ### Claim 14 (depends on 2) The compressor according to claim 2, wherein the oil outflow reduction member includes a disc which encloses a rotor side of the counterweight passing space, and the disc is formed in an annular shape and is formed as a member separate from the crankshaft. ### Claim 15 (depends on 14) The compressor according to claim 14, wherein the counterweight includes a first counterweight formed integrally with the disc and being disposed on the rotor side; and a second counterweight formed integrally with the crankshaft and being coupled to the first counterweight by a fastening member, and the fastening member is disposed so the fastening member does not project on the rotor side from the disc. ### Claim 16 (depends on 13) The compressor according to claim 13, wherein the oil outflow reduction member includes a cover, which encloses the lateral side of the counterweight passing space and a distal side of the counterweight passing space distal from the rotor in the axial direction of the crankshaft. ### Claim 17 (depends on 16) The compressor according to claim 16, wherein the counterweight is disposed above the rotor, and a gap is formed between the disc and the cover in at least part of an area between the disc and the cover. ### Claim 18 (depends on 8) The compressor according to claim 8, wherein an outer diameter of the disc is larger than an outer diameter of the rotor formed in a cylinder shape, and is smaller than an inner diameter of the stator in which the rotor is housed. ### Claim 19 (depends on 5) The compressor according to claim 5, wherein the oil outflow reduction member includes a cover, which encloses the lateral side of the counterweight passing space and a distal side of the counterweight passing space distal from the rotor in the axial direction of the crankshaft. ### Claim 20 (depends on 6) The compressor according to claim 6, wherein the oil outflow reduction member includes a cover, which encloses the lateral side of the counterweight passing space and a distal side of the counterweight passing space distal from the rotor in the axial direction of the crankshaft.