# US 6,719,096 B2 · Breather device for power train of electric vehicle

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- Number: US 6,719,096 B2
- Document ID: US6719096B2
- Status: Granted
- Kind: B2
- Application number: 10/216,192
- Filed: 2002-08-12
- Published: 2003-05-29
- Granted: 2004-04-13
- Earliest claimed: 2001-11-27
- Assignees: Honda Giken Kogyo Kabushiki Kaisha
- Inventors: Seiichi Mogi
- Web page: https://patentgrep.com/patent/US6719096B2

## CPC

- F16H 57/027: characterised by means for venting gearboxes, e.g. air breathers
- Y10T 74/2186: Gear casings
- F16H: GEARING
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A breather device for a power train of an electric vehicle including an electric motor and a gearbox connected to the electric motor. The breather device comprises: a breather chamber provided above a connecting portion connecting an electric motor housing and a gearbox casing; a first breather passage providing a communication between the breather chamber and an inside of the electric motor housing; and a second breather passage providing a communication between the breather chamber and a lubricating oil separation chamber formed in the gearbox casing.

## Claims

### Claim 1

A breather device for a power train of an electric vehicle including an electric motor and a gearbox connected to the electric motor, comprising:
a breather chamber provided above a connecting portion connecting an electric motor housing and a gearbox casing;
a first breather passage providing a communication between the breather chamber and an inside of the electric motor housing; and
a second breather passage providing a communication between the breather chamber and a lubricating oil separation chamber formed in the gearbox casing.

### Claim 2 (depends on 1)

A breather device for a power train of an electric vehicle according to claim 1, wherein a terminal box is provided above the connecting portion in communication with the electric motor housing, wherein an outer wall forming the terminal box and an outer wall forming the gearbox casing are used to form part of the breather chamber, and wherein part of a cover member which covers the terminal box is used as an upper wall of the breather chamber.

### Claim 3 (depends on 2)

A breather device for a power train of an electric vehicle according to claim 2, wherein said outer wall forming the terminal box extends such that an upper end thereof tilts toward the gearbox.