US 12,168,979 B2
Pump configured to reduce number of parts and lower manufacturing cost
Hoon Ki Hong, Seoul (KR)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Appl. No. 17/756,346
Filed by LG INNOTEK CO., LTD., Seoul (KR)
PCT Filed Oct. 7, 2020, PCT No. PCT/KR2020/013671
§ 371(c)(1), (2) Date May 23, 2022,
PCT Pub. No. WO2021/101062, PCT Pub. Date May 27, 2021.
Claims priority of application No. 10-2019-0150619 (KR), filed on Nov. 21, 2019.
Prior Publication US 2022/0412349 A1, Dec. 29, 2022
Int. Cl. F04C 2/10 (2006.01); F04C 15/00 (2006.01); H02K 1/278 (2022.01)
CPC F04C 15/008 (2013.01) [F04C 2/102 (2013.01); H02K 1/278 (2013.01); F04C 2240/20 (2013.01); F04C 2240/40 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A pump comprising:
a housing;
a stator disposed inside the housing;
a pump gear disposed to correspond to the stator and including an external gear and an internal gear; and
a magnet disposed on the external gear,
wherein the magnet includes a first outer circumferential surface,
wherein the external gear includes a second outer circumferential surface,
wherein with respect to a radial direction, a linear distance from a center of the external gear to the second outer circumferential surface is greater than a maximum linear distance from the center of the external gear to the first outer circumferential surface,
wherein the external gear includes an accommodating groove into which the magnet is coupled,
wherein the accommodating groove includes a bottom surface and a side surface connected to the bottom surface,
wherein the side surface includes a first region inclined at a first angle and a second region inclined at a second angle different from the first angle, and
wherein the first region is in contact with a side surface of the magnet, and the second region is not in contact with the side surface of the magnet,
wherein the first angle is an acute angle with respect to the bottom surface of the accommodating groove,
wherein the second angle is an obtuse angle with respect to the bottom surface of the accommodating groove,
wherein a step is disposed on the second outer circumferential surface of the external gear and comes into contact with an upper or a lower surface of the magnet,
wherein a side of the step includes straight portions and curved portions,
wherein the straight portions and the curved portions are arranged alternately along a circumferential direction of the external gear, and
wherein the straight portions are arranged to overlap the accommodating groove.