Drive device

Patent metadata

Field	Value
Publication number	US-10746172-B2
Application number	US-201716323638-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Aug 9, 2016
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

In a drive device, a pump includes a pump room in a housing, a suction port through which oil is to be sucked into the pump room, and a discharge port through which the oil is to be discharged from the pump room. The housing includes an inner lid that holds a bearing journaling a motor shaft and covers one side in an axial direction of a stator, an outer lid that is attached to one side in the axial direction of the inner lid and covers one side in the axial direction of the motor shaft, and a suction oil passage connecting a lower region in a vertical direction in an accommodation portion and the suction port. At least a portion of the suction oil passage is between the inner lid and the outer lid. The inner lid includes an opening penetrating the inner lid and connecting the lower region in the vertical direction and a portion of the suction oil passage between the inner lid and the outer lid. The strainer is provided in the opening.

First claim

The invention claimed is:

1. A drive device comprising:
a rotor including a motor shaft disposed along a center axis extending in one direction and a rotor core fixed to the motor shaft;
a stator radially opposed the rotor with a gap interposed between the stator and the rotor;
a housing including an accommodation portion to store oil and accommodate the rotor and the stator;
a pump driven through the motor shaft; and
a strainer attached to the housing; wherein
the pump includes:
a pump room provided in the housing;
a suction port through which the oil is to be sucked into the pump room; and
a discharge port through which the oil is to be discharged from the pump room;

the housing includes:
an inner lid that holds a bearing journaling the motor shaft and covers one side in an axial direction of the stator;
an outer lid that is attached to one side in the axial direction of the inner lid and covers one side in the axial direction of the motor shaft; and
a suction oil passage connecting a lower region in a vertical direction in the accommodation portion and the suction port;

the inner lid and the outer lid are separate structural elements;
at least a portion of the suction oil passage is disposed between the inner lid and the outer lid;
the inner lid includes an opening penetrating the inner lid;
the opening connects the lower region in the vertical direction in the accommodation portion and a portion disposed between the inner lid and the outer lid in the suction oil passage; and
the strainer is provided in the opening.

2. The drive device according to claim 1 , wherein an opening area of the opening is larger than a passage sectional area of the suction oil passage.

3. The drive device according to claim 1 , wherein the strainer covers an entirety of the opening.

4. The drive device according to claim 1 , wherein
the opening axially penetrates the inner lid and connects the lower region in the vertical direction in the accommodation unit and the portion axially disposed between the inner lid and the outer lid in the suction oil passage; and
the strainer covers the opening from the other side in the axial direction.

5. The drive device according to claim 1 , wherein
the inner lid includes a first recess recessed from the other side in the axial direction toward one side in the axial direction; and
the opening is provided on a bottom surface of the first recess.

6. The drive device according to claim 1 , wherein the strainer includes:
a frame-shaped frame fixed to a circumferential edge of the opening in the inner lid; and
a flat plate-shaped strainer body that is provided inside the frame and covers the opening.

Assignees

• Nidec Corp

Inventors

• Yamaguchi Yasuo

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K5/203 Primary

  specially adapted for liquids, e.g. cooling jackets · CPC title

• H02K11/225

  Detecting coils · CPC title

• H02K9/193

  with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium · CPC title

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title