US 12,078,232 B2
Power transmission device and automobile including the same
Kyeong Ho Shin, Yongin-si (KR)
Assigned to Hyundai Mobis Co., Ltd., Seoul (KR)
Filed by HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed on May 3, 2022, as Appl. No. 17/735,184.
Claims priority of application No. 10-2022-0027006 (KR), filed on Mar. 2, 2022.
Prior Publication US 2023/0279934 A1, Sep. 7, 2023
Int. Cl. F16H 37/08 (2006.01)
CPC F16H 37/082 (2013.01) 15 Claims
OG exemplary drawing
 
1. A power transmission device comprising:
a motor comprising a rotary shaft;
a first decelerator coupled to the rotary shaft and configured to receive power from the rotary shaft, the first decelerator comprising:
a first shaft member including a partial region inserted into the rotary shaft and coupled thereto,
a first sun gear fixed to the first shaft member,
a first planetary gear engaging the first sun gear, and
a first carrier coupled to the first planetary gear;
a second decelerator coupled to the first decelerator and configured to receive power from the first decelerator, the second decelerator comprising:
a second shaft member fixed to the first carrier and coupled thereto;
a second sun gear fixed to the second shaft member;
a second planetary gear disposed on an outer surface of the second sun gear in a radial direction and configured to engage with the second sun gear;
a second ring gear disposed on an outer surface of the second planetary gear in the radial direction and configured to engage with the second planetary gear; and
a second carrier coupled to the second planetary gear;
a wheel bearing coupled to one side of the second decelerator;
a brake disc assembly disposed on one side of the second decelerator; and
a fastening member configured to pass through the second carrier and the brake disc assembly and fix the second carrier to the brake disc assembly,
wherein the first planetary gear is disposed on an outer surface of the first sun gear in a radial direction and configured to engage with the first sun gear, and
wherein the first decelerator further comprises a first ring gear disposed on an outer surface of the first planetary gear in the radial direction, the first ring gear configured to engage with the first planetary gear.