# US 2021/0277573 A1 · Washing machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277573 A1 - Document ID: US20210277573A1 - Status: Published application - Kind: A1 - Application number: 16/603,489 - Filed: 2018-01-10 - Published: 2021-09-09 - Earliest claimed: 2017-04-07 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Young-min CHOI; Tae-kil KIM; Young-hyun KIM; Young-jin UM; Kyu-nam LEE - Web page: https://patentgrep.com/patent/US20210277573A1 ## CPC - D06F 37/24: in machines with a receptacle rotating or oscillating about a vertical axis - D06F 23/04: and rotating or oscillating about a vertical axis - D06F 37/304: {Arrangements or adaptations of electric motors} - D06F 37/40: for driving the receptacle and an agitator or impeller, e.g. alternatively {(D06F37/304, D06F37/308 take precedence)} - D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES ## Abstract A washing machine is provided. The washing machine comprises a pulsator rotatably disposed in a rotation tub, a washing shaft rotating in conjunction with the pulsator, and a connecting member which connects the washing shaft and a motor to transmit a driving force of the motor to the washing shaft, wherein the connecting member comprises a first bush coupled to the washing shaft and a second bush coupled to the motor, and the second bush is coupled to the washing shaft to which the first bush is coupled and rotates in engagement with the first bush. ## Claims ### Claim 1 A washing machine comprising: a pulsator rotatably disposed in a rotation tub; a washing shaft rotating in conjunction with the pulsator; and a connecting member which connects the washing shaft and a motor to transmit a driving force of the motor to the washing shaft, wherein the connecting member comprises a first bush coupled to the washing shaft and a second bush coupled to the motor, and the second bush is coupled to the washing shaft to which the first bush is coupled and rotates in engagement with the first bush. ### Claim 2 (depends on 1) The washing machine of claim 1, wherein the first bush comprises a first concave-convex part formed along the circumference of the washing shaft, and the second bush comprises a second concave-convex part engaged with the first concave-convex part. ### Claim 3 (depends on 2) The washing machine of claim 2, wherein the first bush comprises a first body to which the washing shaft is penetration-coupled and a flange part coupled to the first body, and the second bush comprises a second body into which the first body is inserted and to which a portion of the washing shaft that penetrated the first body is coupled and a seating part wherein the flange part is seated, and the first concave-convex part is formed in the flange part, and the second concave-convex part is formed in the seating part. ### Claim 4 (depends on 3) The washing machine of claim 3, wherein the flange part protrudes in the radial direction of the washing shaft from the upper end portion of the first body, and the seating part is formed on the upper surface of the second body. ### Claim 5 (depends on 4) The washing machine of claim 4, wherein each of the first and second bodies is formed in the form of a cylinder into which the washing shaft can be inserted, and the first concave-convex part is formed on the bottom surface of the flange part, and the second concave-convex part is formed in the seating part contacting the bottom surface of the flange part. ### Claim 6 (depends on 5) The washing machine of claim 5, wherein the first and second bushes consist of metallic materials, and the first concave-convex part and the second concave-convex part are formed through knurling. ### Claim 7 (depends on 5) The washing machine of claim 5, wherein each of the first and second concave-convex parts comprises plurality of threads and plurality of roots formed along the circumference of the flange part and the circumference of the seating part. ### Claim 8 (depends on 3) The washing machine of claim 3, wherein the second body comprises a first hole into which the first body is inserted and a second hole to which a portion of the washing shaft that is connected with the first hole and penetrated the first body is insertion-coupled. ### Claim 9 (depends on 8) The washing machine of claim 8, wherein the washing shaft comprises a first portion coupled to the first body and a second portion coupled to the second body, and the first and second portions respectively comprise first and second serration parts formed on an outer circumferential surface. ### Claim 10 (depends on 9) The washing machine of claim 9, wherein the first body comprises a penetration hole to which the first portion is penetration-coupled and a third serration part that is formed on an inner circumferential surface of the penetration hole and is engaged with the first serration part. ### Claim 11 (depends on 10) The washing machine of claim 10, wherein the first serration part and the third serration part are interference fitted. ### Claim 12 (depends on 9) The washing machine of claim 9, wherein the second body comprises a fourth serration part that is formed on an inner circumferential surface of the second hole and is engaged with the second serration part. ### Claim 13 (depends on 12) The washing machine of claim 12, wherein the second serration part and the fourth serration part are clearance fitted. ### Claim 14 (depends on 1) The washing machine of claim 1, wherein the motor comprises a stator and a rotor that rotates by an electromagnetic force with the stator, and the second bush comprises plurality of protruding portions protruding from the side surface, and is coupled to a rotation center portion of the rotor. ### Claim 15 (depends on 1) The washing machine of claim 1, further comprising: a clutch unit which makes a driving force generated at the motor be selectively transmitted to a spin-dry shaft rotating the rotation tub.