US 12,081,080 B2
Drive device
Keigo Nakamura, Kyoto (JP); Keisuke Fukunaga, Kyoto (JP); and Shohei Fujimoto, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by NIDEC CORPORATION, Kyoto (JP)
Filed on Mar. 11, 2022, as Appl. No. 17/692,176.
Claims priority of application No. 2021-040269 (JP), filed on Mar. 12, 2021.
Prior Publication US 2022/0294317 A1, Sep. 15, 2022
Int. Cl. H02K 11/33 (2016.01); B60L 50/51 (2019.01); H02K 7/00 (2006.01); H02K 7/08 (2006.01); H02K 7/116 (2006.01)
CPC H02K 11/33 (2016.01) [B60L 50/51 (2019.02); H02K 7/006 (2013.01); H02K 7/083 (2013.01); H02K 7/116 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A drive device comprising:
a motor portion including a rotor having a motor shaft rotatable about a first rotation axis extending in an axial direction, and a stator disposed radially outward from the rotor;
a gear portion located at one end portion in the axial direction of the motor portion; and
a housing for accommodating the motor portion and the gear portion, wherein the gear portion includes:
a first shaft connected to the motor shaft;
a first gear located on a radially outer surface of the first shaft;
a second shaft extending along a second rotation axis extending in the axial direction,
a second gear and a third gear, which are located on the radially outer surface of the second shaft extending in the axial direction, and are rotatable around the second rotation axis; and
a fourth gear that is rotatable around a third rotation axis extending in the axial direction,
the second gear is disposed on an other side of the third gear in the axial direction and meshes with the first gear,
the third gear meshes with the fourth gear,
a pitch circle diameter of the second gear is larger than a pitch circle diameter of the third gear,
the third rotation axis is disposed on one side in a first direction perpendicular to the axial direction with respect to the first rotation axis,
the housing includes:
a motor housing that has a tubular shape extending in the axial direction and accommodates the motor portion;
a gear housing that has a tubular shape extending in the axial direction and accommodates the gear portion;
a partition wall that separates the motor housing and the gear housing; and
an inverter housing that accommodates an inverter unit electrically connected to the stator, the inverter housing includes:
a bottom plate extending from an outer surface of the motor housing to one side in the first direction, wherein the bottom plate is disposed on an other side in the second direction with respect to the second shaft; and
a peripheral wall that protrudes from an outer edge portion of the bottom plate when viewed from the second direction to an other side in the second direction and surrounds the bottom plate when viewed from the second direction,
the fourth gear is disposed on one side in the axial direction with respect to the inverter housing,
the first rotation axis is disposed on an other side in the first direction with respect to the inverter housing,
the third rotation axis is disposed on one side in a second direction perpendicular to the axial direction and the first direction with respect to the inverter housing,
the partition wall includes:
a first partition wall that spreads in a direction intersecting with the axial direction and covers one end portion of the motor housing in the axial direction; and
a second partition wall that extends in a direction intersecting with the axial direction, is disposed on one side of the first partition wall in the first direction, and covers an other end portion of the gear housing in the axial direction together with the first partition wall, and
the second partition wall is disposed on one side of the first partition wall in the axial direction.