# US 10,865,784 B2 · Linear compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,784 B2 - Document ID: US10865784B2 - Status: Granted - Kind: B2 - Application number: 16/535,625 - Filed: 2019-08-08 - Published: 2019-11-28 - Granted: 2020-12-15 - Earliest claimed: 2017-06-21 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyunsoo Kim; Geonwoo Kim; Chulgi Roh - Web page: https://patentgrep.com/patent/US10865784B2 ## CPC - F04B 39/125: {Cylinder heads} - F04B 35/04: the means being electric - F04B 35/045: {using solenoids} - F04B 39/121: {Casings} - F04B 39/14: Provisions for readily assembling or disassembling - F04B 39/0061: {using muffler volumes} - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) ## Abstract A linear compressor includes a frame including a frame body, a frame head that extends from a front end of the frame body, a flange groove defined in the frame head, and a body hole that passes through the frame body; a cylinder including a cylinder body inserted into the body hole, a cylinder flange, and a cylinder head provided on a front end of the cylinder flange; and a lock ring press-fitted to be coupled to the flange groove and provided in a space defined between the cylinder head and an inner circumferential surface of the flange groove. ## Claims ### Claim 1 A linear compressor, comprising: a shell; a frame received in the shell, an outer surface of the frame being spaced apart from an inner surface of the shell; a cylinder inserted in an accommodation hole which passes through the frame; and lock ring, a portion of an outer surface of which is press-fitted into the accommodation hole of the frame, wherein an inner surface of the lock ring is configured to encircle a portion of an outer surface of the cylinder, wherein the outer surface of the cylinder facing the inner surface of the lock ring is spaced apart from the inner surface of the lock ring so as not to contact an entire inner surface of the lock ring. ### Claim 2 (depends on 1) The linear compressor according to claim 1, wherein the frame includes: a frame body extending in a first direction; and a frame head extending in a second direction from a first end of the frame body, wherein the first direction is perpendicular to the second direction. ### Claim 3 (depends on 2) The linear compressor according to claim 2, wherein the accommodation hole includes: a flange groove formed at a junction between the frame body and the frame head, the flange groove being configured to receive a first portion of the cylinder and having: a bottom part; and a side part vertically extending from an outer edge of the bottom part; and a body hole passing through the frame body to communicate with the flange groove and configured to receive a second portion of the cylinder. ### Claim 4 (depends on 3) The linear compressor according to claim 3, wherein the cylinder includes: a cylinder body inserted into the body hole; a cylinder head received in the flange groove and having an outer diameter greater than an outer diameter of the cylinder body at a first end of the cylinder body; and a cylinder flange formed between the cylinder body and the cylinder head to be received in the flange groove and having an outer diameter greater than the outer diameter of the cylinder head. ### Claim 5 (depends on 4) The linear compressor according to claim 4, wherein the outer surface of the lock ring includes: a first surface having a diameter equal to or greater than a diameter of the side part of the flange groove; a second surface spaced part having an outer diameter less than the outer diameter of the first surface; and a stepped part defined at a boundary between the first surface and the second surface. ### Claim 6 (depends on 4) The linear compressor according to claim 4, further comprising at least one press ring provided at a position in a gap which is defined by an outer surface of the cylinder and an inner surface of the frame to form the accommodation hole. ### Claim 7 (depends on 6) The linear compressor according to claim 6, wherein the at least one press ring includes a first press ring provided between the lock ring and the cylinder flange, wherein the first ring is mounted on a front surface of the cylinder flange, and wherein the lock ring is mounted on the first press ring. ### Claim 8 (depends on 6) The linear compressor according to claim 6, wherein the at least one press ring includes a second press ring provided between a rear surface of the cylinder flange and the bottom part of the flange groove. ### Claim 9 (depends on 8) The linear compressor according to claim 8, wherein the frame further includes a press ring seat groove recessed from the bottom part of the flange groove and in which the second press ring is seated. ### Claim 10 (depends on 9) The linear compressor according to claim 9, wherein the rear surface of the cylinder flange is spaced a predetermined distance from the bottom part of the flange groove to allow the second press ring to come into contact with the rear surface of the cylinder flange. ### Claim 11 (depends on 4) The linear compressor according to claim 4, wherein the inner surface of the lock ring is spaced apart from an outer surface of the cylinder head. ### Claim 12 (depends on 4) The linear compressor according to claim 4, wherein a side surface of the cylinder flange is spaced apart from the side part of the flange groove. ### Claim 13 A linear compressor, comprising: a shell; a frame received in the shell, an outer surface of the frame being spaced apart from an inner surface of the shell; a cylinder inserted in an accommodation hole which passes through the frame; and a lock ring, a portion of an outer surface of which is press-fitted into the accommodation hole of the frame, wherein an inner circumferential surface of the lock ring is configured to encircle a portion of an outer surface of the cylinder, wherein the frame includes: a frame body extending in a first direction; and a frame head extending in a second direction from a first end of the frame body, wherein the accommodation hole includes: a flange groove formed at a junction between the frame body and the frame head, the flange groove being configured to receive a first portion of the cylinder and having: a bottom part; and a side part vertically extending from an outer edge of the bottom part; and a body hole passing through the frame body to communicate with the flange groove and configured to receive a second portion of the cylinder, and wherein the cylinder includes: a cylinder body inserted into the body hole; a cylinder head received in the flange groove and having an outer diameter greater than an outer diameter of the cylinder body at a first end of the cylinder body; and a cylinder flange formed between the cylinder body and the cylinder head to be received in the flange groove and having an outer diameter greater than the outer diameter of the cylinder head. ### Claim 14 (depends on 13) The linear compressor according to claim 13, wherein the outer surface of the lock ring includes: a first surface having a diameter equal to or greater than a diameter of the side part of the flange groove; a second surface spaced part having an outer diameter less than the outer diameter of the first surface; and a stepped part defined at a boundary between the first surface and the second surface. ### Claim 15 (depends on 13) The linear compressor according to claim 13, further comprising at least one press ring provided at a position in a gap which is defined by an outer surface of the cylinder and an inner surface of the frame to form the accommodation hole. ### Claim 16 (depends on 15) The linear compressor according to claim 15, wherein the at least one press ring includes a first press ring provided between the lock ring and the cylinder flange, wherein the first ring is mounted on a front surface of the cylinder flange, and wherein the lock ring is mounted on the first press ring. ### Claim 17 (depends on 15) The linear compressor according to claim 15, wherein the at least one press ring includes a second press ring provided between a rear surface of the cylinder flange and the bottom part of the flange groove. ### Claim 18 (depends on 17) The linear compressor according to claim 17, wherein the frame further includes a press ring seat groove recessed from the bottom part of the flange groove and in which the second press ring is seated, and wherein the rear surface of the cylinder flange is spaced a predetermined distance from the bottom part of the flange groove to allow the second press ring to come into contact with the rear surface of the cylinder flange. ### Claim 19 (depends on 13) The linear compressor according to claim 13, wherein the inner circumferential surface of the lock ring is spaced apart from an outer surface of the cylinder head. ### Claim 20 (depends on 13) The linear compressor according to claim 13, wherein a side surface of the cylinder flange is spaced apart from the side part of the flange groove.