Seal structure of drive device

Patent metadata

Field	Value
Publication number	US-2022018354-A1
Application number	US-202117365404-A
Country	US
Kind code	A1
Filing date	Jul 1, 2021
Priority date	Jul 16, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

A seal structure of a drive device is provided which includes a case in which a motor chamber for accommodating an electric motor and a gear chamber for accommodating a gear mechanism are located adjacent to each other, a partition that separates the motor chamber and the gear chamber, a bearing that supports a rotating shaft, a seal part that seals between the rotating shaft and the partition, a lubricating oil that lubricates the gear mechanism, and a coolant that cools the electric motor, and also includes a first bearing on the motor chamber side, a second bearing on the gear chamber side, a first seal part on the motor chamber side, a second seal part on the gear chamber side, and at least the second seal part of the first seal part and the second seal part is provided between the first bearing and the second bearing.

First claim

What is claimed is:

1 . A seal structure of a drive device comprising:
an electric motor; a rotating shaft that rotates together with a rotor of the electric motor; a gear mechanism connected to the rotating shaft; a case in which a motor chamber for accommodating the electric motor and a gear chamber for accommodating the gear mechanism are located adjacent to each other; a partition that has a through hole into which the rotating shaft is inserted and separates the motor chamber and the gear chamber in the case; a bearing that is attached to the partition to rotatably support the rotating shaft inserted in the through hole; a seal part that is arranged in line with the bearing in an axial direction of the rotating shaft to seal between the rotating shaft and the partition; a lubricating oil that lubricates the gear mechanism inside the gear chamber; and a coolant that cools the electric motor inside the motor chamber, the coolant being a different type of liquid from the lubricating oil, wherein the bearing includes a first bearing located on the motor chamber side with respect to the through hole, and a second bearing located on the gear chamber side with respect to the through hole, the seal part includes
a first seal part, and
a second seal part located on the gear chamber side with respect to the first seal part, and
at least the second seal part of the first seal part and the second seal part is provided between the first bearing and the second bearing.

2 . The seal structure of the drive device according to claim 1 , wherein
the first seal part is a mechanical seal provided between the first bearing and the second bearing, and the mechanical seal includes
a rotating ring provided on the rotating shaft, and
a stationary ring that is in contact with the rotating ring and is fixed to the partition.

3 . The seal structure of the drive device according to claim 2 , wherein
the second seal part is an oil seat including a seal lip part that is in contact with the rotating shaft, and the second bearing is a rolling bearing lubricated by the lubricating oil.

4 . The seal structure of the drive device according to claim 1 , wherein
the first seal part is a mechanical seal located on the motor chamber side with respect to the first bearing, and the mechanical seal includes
a rotating ring provided on the rotating shaft, and
a stationary ring that is in contact with the rotating ring and is fixed to the partition.

5 . The seal structure of the drive device according to claim 4 , wherein
the second seal part is constituted by a labyrinth structure.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tominaga Satoshi
• Tokozakura Daisuke
• Iwama Yuki
• Shibata Hiroyuki

Classifications

• B60K17/043

  Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel · CPC title

• H02K5/1732

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

• F16H57/021

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• F16H2057/02008

  characterised by specific dividing lines or planes of the gear case · CPC title

• F16H2057/02052

  Axle units; Transfer casings for four wheel drive · CPC title