BREATHER STRUCTURE IN POWER UNIT

WIPO Patent Application WO/2023/162153

A1

A case C of a power unit of the present invention comprises: an oil supply passage 17, 90 for supplying part of the oil of a transmission mechanism chamber 10 to a bearing of a motor output shaft 26; an oil return passage 16 for returning oil to the transmission mechanism chamber from a motor space 20; and a partition wall 12s that has one side surface facing the transmission mechanism chamber and another side surface facing the motor space. The one side surface of the partition wall 12s and a lid 80 coupled to the one side surface define a breather chamber 60 that is shielded from the transmission mechanism chamber, and an inlet 60i of the breather chamber opens on the other side surface of the partition wall 12s and communicates through to the motor space. This makes it possible to curb penetration, into the breather chamber, of oil dispersing from respective gears of a gear transmission mechanism in a transmission case, as well as to reduce the risk of oil blowout from the breather chamber. Moreover, because the breather chamber is defined by the one side surface of the partition wall of the transmission case and the lid coupled thereto, a hollow structure of the breather chamber that is isolated from the transmission mechanism chamber is easily obtained without further complicating the partition structure or molding steps of the transmission case.

BUTTA NAOFUMI (JP)

PCT/JP2022/007942

August 31, 2023

February 25, 2022

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MUSASHI SEIMITSU KOGYO KK (JP)

F16H57/027

JP2017161000A	2017-09-14
JP2003161363A	2003-06-06
JP6137317B2	2017-05-31
JP2020067101A	2020-04-30

NAGOYA INTERNATIONAL IP FIRM (JP)

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