IP Library › Granted Patent US 12663072
Granted Patent B2
US 12663072 · App. 19/101,425 · Granted Jun 23, 2026

Power transmission device

Inventor: Akira Tsuchida (Sagamihara, JP)
Assignees: JATCO Ltd; NISSAN MOTOR CO., LTD.
F16H57/0457F16H1/20F16H57/021F16H57/027F16H57/0423F16H57/0424F16H57/045F16H57/0471
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Quick Facts
Patent No.
US 12663072
App. No.
19/101,425
Granted
Jun 23, 2026
Kind
B2
Abstract

A power transmission device includes a case including an oil reservoir at a lower portion thereof, and a first shaft, a second shaft, and a third shaft which are shaft-supported by the case. The case includes an air breather chamber that separates air and an oil in the case and communicates with the atmosphere, an oil catch tank that reserves an oil raked up by a third gear portion of the third shaft, and an oil guide that introduces the oil raked up by the third gear portion into the oil catch tank. The air breather chamber is provided above and near the third shaft. The oil catch tank is provided above and near the first shaft. The oil guide is provided above the second shaft. The second shaft is disposed outside the oil reservoir in the case.

Claims (20)

1 . A power transmission device comprising:

a case including an oil reservoir at a lower portion thereof; and

a first shaft, a second shaft, and a third shaft which are shaft-supported by the case, wherein

the first shaft is connected to a power source and includes a first gear portion which outputs power from the power source,

the second shaft includes a second gear portion which receives power from the first gear portion and which outputs the received power,

the third shaft includes a third gear portion which receives power from the second gear portion and which has at least a part immersed in the oil reservoir,

the case includes

an air breather chamber that separates air and an oil in the case and communicates with the atmosphere,

an oil catch tank that reserves an oil raked up by the third gear portion, and

an oil guide that introduces the oil raked up by the third gear portion into the oil catch tank,

the air breather chamber is provided above and near the third shaft,

the oil catch tank is provided above and near the first shaft,

the oil guide is provided above the second shaft, and

a second axis of the second shaft is set at a position higher than a first axis of the first shaft and a third axis of the third shaft, and the second shaft is disposed above an oil in the oil reservoir.

2 . The power transmission device according to claim 1 , wherein

a total of three shafts, that is, the first shaft, the second shaft, and the third shaft, are disposed as power transmission shafts in the case.

3 . The power transmission device according to claim 1 , wherein

the case further includes an oil passage that introduces the oil reserved in the oil catch tank into a bearing that supports the first shaft.

4 . The power transmission device according to claim 1 , wherein

the oil guide is disposed directly above the second axis of the second shaft, and the air breather chamber is not disposed directly above the second axis of the second shaft.