Spacer and electric supercharger

Patent metadata

Field	Value
Publication number	US-10480396-B2
Application number	US-201715707002-A
Country	US
Kind code	B2
Filing date	Sep 18, 2017
Priority date	Oct 14, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A spacer is disposed between a rotor and a bearing of an electric supercharger to fix the rotor. The spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer. An area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side. A balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface. A region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor.

First claim

What is claimed is:

1. A spacer that is disposed, to fix a rotor of an electric supercharger, between the rotor and a bearing disposed in a direction of a rotational axis of the rotor relative to the rotor, the spacer comprising a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer, wherein
an area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side,
a balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface of the spacer on the rotor side, and
a region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor.

2. The spacer according to claim 1 , wherein:
the spacer has a conical outer shape; and
the spacer includes a perforated portion, and the central axis of the spacer is disposed on the rotational axis of the rotor.

3. The spacer according to claim 1 , wherein the balance correction part is a weight adjustment part that is formed in the spacer so that a center of gravity of the spacer is located on the central axis of the spacer.

4. The spacer according to claim 1 , wherein:
the balance correction part includes an excavated portion formed in the spacer, and a burr resulting from formation of the excavated portion; and
the recess is formed so as to have a diameter around the central axis of the spacer, and has a depth that allows the recess to accommodate the burr of the balance correction part.

5. The spacer according to claim 1 , wherein the balance correction part is a weight provided inside the recess.

6. An electric supercharger in which a spacer is disposed, to fix a rotor, between the rotor and a bearing disposed in a direction of a rotational axis of the rotor relative to the rotor, the electric supercharger comprising:
a housing that supports a shaft through the bearing and has an air flow passage;
a turbine that is disposed inside the flow passage and fixed at a leading end of the shaft; and
a stator that surrounds the rotor and is fixed to the housing, wherein
an area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side,
the spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer,
a balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface of the spacer on the rotor side, and
a region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor.

7. The electric supercharger according to claim 6 , wherein:
the spacer has a conical outer shape; and
the spacer includes a perforated portion that extends through the spacer in a left-right direction of the electric supercharger, and the central axis of the spacer is disposed on the rotational axis of the shaft.

8. The electric supercharger according to claim 6 , wherein the balance correction part is a weight adjustment part that is formed in the spacer so that a center of gravity of the spacer is located on the central axis of the spacer.

9. The electric supercharger according to claim 6 , wherein:
the balance correction part includes an excavated portion formed in the spacer, and a burr resulting from formation of the excavated portion; and
the recess is formed so as to have a diameter around the central axis of the spacer, and has a depth that allows the recess to accommodate the burr of the balance correction part.

10. The electric supercharger according to claim 6 , wherein the balance correction part is a weight provided inside the recess.

Assignees

• Toyota Motor Co Ltd

Inventors

• Sadamitsu Takahiro
• Takeyama Makoto

Classifications

• F05D2220/40

  in turbochargers · CPC title

• F16C19/547

  with two angular contact rolling bearings · CPC title

• F02B39/10

  electric · CPC title

• F02B33/40 Primary

  of non-positive-displacement type · CPC title

• F16C19/06

  with a single row or balls · CPC title