Motor driven compressor

Patent metadata

Field	Value
Publication number	US-9970428-B2
Application number	US-201414444290-A
Country	US
Kind code	B2
Filing date	Jul 28, 2014
Priority date	Jul 30, 2013
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A motor-driven compressor includes a metal housing accommodating a compression unit and an electric motor and a resin cover coupled to the housing. The cover and the housing define an accommodation chamber that accommodates a motor driving circuit that drives the electric motor. A metal shield is fixed to the cover and blocks electromagnetic noise. The shield and the cover are stacked together. A sealing member located between the shield and the cover. The sealing member is configured to block entry of foreign matter into the accommodation chamber through a gap between the shield and the cover.

First claim

The invention claimed is:

1. A motor-driven compressor comprising:
a metal housing accommodating a compression unit and an electric motor;
a resin cover coupled to the metal housing, wherein the resin cover and the metal housing define an accommodation chamber that accommodates a motor driving circuit that drives the electric motor;
a metal shield that is fixed to the resin cover and blocks electromagnetic noise, wherein the metal shield and the resin cover are stacked together; and
a sealing member located between the metal shield and the resin cover, wherein the sealing member blocks entry of foreign matter into the accommodation chamber, wherein:
the resin cover includes an annular accommodation groove or an annular cut out part that forms a space enclosed by the metal shield and the resin cover so that the sealing member is disposed in the space,
each of the resin cover and the metal shield includes an insertion hole,
a bolt is inserted through the insertion holes of the resin cover and the metal shield and couples the resin cover and the metal shield to the metal housing,
the sealing member is annular and surrounds the insertion hole of the resin cover,
the bolt includes a head and a rod,
the metal shield includes a section surrounding the insertion hole of the metal shield which is located between the head of the bolt and the metal housing, and the bolt applies an axial force to the section of the metal shield surrounding the insertion hole of the metal shield without applying the axial force to the resin cover; and
a metal spacer forming a portion of the metal shield,
wherein:
the metal spacer is located between the head of the bolt and the metal shield,
the rod of the bolt extends through the metal spacer,
the metal spacer receives the axial force of the bolt and includes a rim located between the metal shield and the resin cover, and
the sealing member is located between the resin cover and the metal spacer.

2. The motor-driven compressor according to claim 1 ,
wherein
the metal spacer includes a tubular portion and an end wall,
the rod of the bolt extends through the end wall of the metal spacer,
the sealing member is located in the tubular portion of the metal spacer,
the resin cover includes an annular groove, and the tubular portion of the spacer is inserted into the annular groove.

3. The motor-driven compressor according to claim 1 , wherein
the sealing member is compressed in a direction intersecting an axis of the bolt.

4. The motor-driven compressor according to claim 1 , wherein the metal shield is located at an inner side of the resin cover.

5. The motor-driven compressor according to claim 1 , further comprising a rotation shaft accommodated in the metal housing and rotated integrally with a rotor of the electric motor, wherein the compression unit, the electric motor, and the motor driving circuit are arranged in this order along an axis of the rotation shaft.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Kinoshita Yusuke
• Suitou Ken
• Kuroki Kazuhiro
• Hishinuma Yumin
• Takahata Junichi
• Yano Junya
• Mizuno Takuro

Classifications

• F04C2240/403

  with inverter for speed control · CPC title

• F04C2240/808

  Electronic circuits (e.g. inverters) installed inside the machine · CPC title

• F04B39/0033 Primary

  with encapsulations · CPC title

• F04B35/04

  the means being electric · CPC title

• F04C2240/805

  Fastening means, e.g. bolts · CPC title