Rotary electric machine and manufacturing method of rotary electric machine

Patent metadata

Field	Value
Publication number	US-11569705-B2
Application number	US-202117182197-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Feb 26, 2020
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

An object of the present invention is to hold a holding member appropriately in a casing.A rotary electric machine includes a rotor having a drive shaft, a stator provided on an outer periphery of the rotor, a bearing B2 that rotatably supports the drive shaft, a holding member that contains an aluminum alloy member and holds the bearing, and a casing that houses the rotor, the stator, the bearing, and the holding member. The casing is made of a member that does not grow permanently or an aluminum alloy member that is permanently grown when the holding member is fixed to the casing. The holding member is in a state before permanent growth before being fixed in the casing, and the holding member grows permanently to be fixed more firmly to the casing.

First claim

The invention claimed is:

1. A rotary electric machine comprising:
a rotor having a drive shaft;
a stator provided on an outer periphery of the rotor;
a bearing that rotatably supports the drive shaft;
a holding member that contains an aluminum alloy member and holds the bearing; and
a casing that houses the rotor, the stator, the bearing, and the holding member, wherein
the casing is made of a member that does not grow permanently or an aluminum alloy member that has grown permanently before fixing the holding member to the casing, and
the holding member is in a state before permanent growth when fixed in the casing, and the holding member grows permanently to be fixed more firmly to the casing.

2. The rotary electric machine according to claim 1 , wherein in the holding member, a ratio of an outer diameter when returned to room temperature after heating at 200° C. for five hours to an outer diameter at room temperature is 100.1% or more and 100.14% or less.

3. The rotary electric machine according to claim 1 , wherein the holding member includes an ADC12 member.

4. The rotary electric machine according to claim 1 , wherein the holding member is fixed in the casing by bringing an outer peripheral surface into contact with an inner peripheral surface of the casing.

5. The rotary electric machine according to claim 1 , wherein
the casing has an opening in a portion opposite to a part where the stator is provided in a part where the holding member is provided, in an extending direction of the drive shaft,
the rotary electric machine further comprises a cover member provided in the opening and fixed to the casing, and
the holding member is fixed in the casing by coming into contact with the cover member.

6. The rotary electric machine according to claim 1 , wherein
the holding member includes a bearing holder that holds the bearing, and an annular ring that is in contact with a surface of the bearing holder and is made of an aluminum alloy member in a state before permanent growth before being fixed to the casing, and
the ring fixes the bearing holder in the casing by bringing an outer peripheral surface into contact with an inner peripheral surface of the casing.

7. A manufacturing method of a rotary electric machine including a rotor having a drive shaft, a stator provided on an outer periphery of the rotor, a bearing that rotatably supports the drive shaft, a holding member that contains an aluminum alloy member and holds the bearing, and a casing that houses the rotor, the stator, the bearing, and the holding member, the manufacturing method comprising
an insertion step of inserting the holding member before permanent growth into the casing made of a member that does not grow permanently or an aluminum alloy member that has permanently grown.

Assignees

• Kyb Corp

Inventors

• Ueno Sayaka
• Kawaguchi Takayuki
• Matsuda Shun
• Matsumae Tarou

Classifications

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• F16C17/02

  for radial load only · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• H02K5/1732 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• F16C35/067

  Fixing them in a housing (with interposition of an element F16C35/07) · CPC title