POWER TRANSMISSION DEVICE

To provide a power transmission device which can effectively suppress oil from spouting out of a breather chamber in the atmosphere by improving the return property of the oil intruded into the breather chamber from a housing chamber of a clutch and the like to the housing chamber.SOLUTION: A power transmission device 100 includes: a rotary shaft 4 extending in the vehicle width direction to transmit power to drive wheels of the vehicle; a rotary parts housing chamber 16 disposed on the end section or in its vicinity of the rotary shaft in the axial direction and adapted to house rotary parts including a clutch 5R; and a breather chamber 81 disposed on the outside (the upper side) of the rotary shaft, where a first communication passage 80 is provided to communicate with the breather chamber and the rotary parts housing chamber. The oil intruded into the breather chamber is discharged from the breather chamber through the first communication passage and is led to the rotary parts housing chamber by the negative pressure due to the pull-in to the rotary parts housing chamber accompanying rotation of the rotary parts.SELECTED DRAWING: Figure 3 【課題】クラッチなどの収容室からブリーザ室へ侵入したオイルの収容室への戻り性能を向上させることで、ブリーザ室からの大気中へのオイル噴きを効果的に抑制することができる動力伝達装置を提供する。【解決手段】車両の幅方向に延びて該車両の駆動輪に動力を伝達する回転軸４と、回転軸の軸方向端部又はその近傍に配置され、クラッチ５Ｒを含む回転部品を収容する回転部品収容室１６と、回転軸の外側（上側）に設けられたブリーザ室８１とを備える動力伝達装置１００であって、ブリーザ室と回転部品収容室とを連通する第１の連通路８０が設けられている。ブリーザ室に侵入したオイルは回転部品の回転に伴う回転部品収容室への引き込みによる負圧により、第１の連通路を介してブリーザ室から排出されて回転部品収容室へ導かれる。【選択図】図３