US 11,791,688 B2
Hollow shaft motor
Ok Yun Kim, Seoul (KR); Kea Ho Lee, Gwangju (KR); Haeng Chul Sin, Gwangju (KR); and Gwan Seon Jeong, Gwangju (KR)
Assigned to BMC CO., LTD., Anseong-si (KR)
Appl. No. 17/272,659
Filed by BMC CO., LTD., Anseong-si (KR)
PCT Filed Aug. 9, 2019, PCT No. PCT/KR2019/010036
§ 371(c)(1), (2) Date Mar. 2, 2021,
PCT Pub. No. WO2020/080657, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 10-2018-0123435 (KR), filed on Oct. 16, 2018.
Prior Publication US 2021/0194317 A1, Jun. 24, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H02K 7/00 (2006.01); H02K 3/52 (2006.01); H02K 5/173 (2006.01); H02K 5/22 (2006.01); H02K 7/08 (2006.01); H02K 21/16 (2006.01)
CPC H02K 7/003 (2013.01) [H02K 3/522 (2013.01); H02K 5/1732 (2013.01); H02K 5/225 (2013.01); H02K 7/083 (2013.01); H02K 21/16 (2013.01); H02K 2203/09 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A hollow shaft motor, comprising:
a housing (11) having a cylindrical shape;
an upper cover (12) coupled to an upper portion of the housing (11);
a lower cover (15) coupled to a lower portion of the housing (11);
a stator assembly (20) located in the housing (11);
a rotor assembly (30) located in the stator assembly (20) to rotate, wherein the rotor assembly (30) comprises a hollow shaft (31), a rotor core (32) coupled to an outer circumference of the hollow shaft (31), and a plurality of magnets (33) attached to an outer circumference of the rotor core (32); and
a lower bearing (14) located in the housing (11),
wherein the housing (11) has a lower protruding part (115) being formed with bent and folded to reinforce strength by a pressing process, wherein a bent portion of the lower protruding part (115) is folded by directly contacting with each other,
wherein the lower bearing (14) is supported by a support structure including a stopper (16) and a lower bearing receiving part (117), the stopper (16) located in the lower protruding part (115) and the lower bearing receiving part (117) formed such that a material of the lower protruding part (115) is bent by the pressing process to extend upwardly from a lower portion of the lower protruding part (115),
wherein the lower protruding part (115) is located in a space formed between an outer circumferential surface of the stopper (16) and in inner circumferential surface of the lower cover (15),
wherein the stopper (16) supports a lower surface of lower bearing (14) and is coupled to an inner circumferential surface of the lower protruding part (115).