Breather structure for transfer

A power transmission mechanism comprising:

• a first casing structure defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer, and which is opened to an outside;
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber;
• and
• a gas-liquid separating device interposed between the transfer chamber and the connecting passage so that the transfer chamber and the connecting passage are connected through the gas-liquid separating device, wherein
• the first casing structure comprises a transmission case and the second casing structure comprises a transfer case joined with the transmission case in a joint surface,
• the atmospheric chamber is formed between the transmission case and the transfer case,
• the gas-liquid separating device is arranged to prevent passage of a lubricating oil from the transfer chamber to the connecting passage, and
• the second casing structure includes a lower portion defining an atmospheric hole formed in a lower portion of the atmospheric chamber and opened to the atmosphere.

A power transmission mechanism comprising:

• a first casing structure defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer, and which is opened to an outside;
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber;
• and
• a gas-liquid separating device interposed between the transfer chamber and the connecting passage so that the transfer chamber and the connecting passage are connected through the gas-liquid separating device, wherein
• the first casing structure comprises a transmission case and the second casing structure comprises a transfer case joined with the transmission case in a joint surface,
• the atmospheric chamber is formed between the transmission case and the transfer case,
• the gas-liquid separating device is arranged to prevent passage of a lubricating oil from the transfer chamber to the connecting passage, and
• the atmospheric chamber is opened to the atmosphere through a clearance in the joint surface.

A power transmission mechanism comprising:

• a first casing structure defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer, and which is opened to an outside;
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber;
• and
• a gas-liquid separating device interposed between the transfer chamber and the connecting passage so that the transfer chamber and the connecting passage are connected through the gas-liquid separating device, wherein
• the first casing structure comprises a transmission case and the second casing structure comprises a transfer case joined with the transmission case in a joint surface,
• the atmospheric chamber is formed between the transmission case and the transfer case,
• the gas-liquid separating device is arranged to prevent passage of a lubricating oil from the transfer chamber to the connecting passage, and
• the gas-liquid separating device comprises a partition member fixed to an inside surface of the transfer case, and arranged to define a gas-liquid separating chamber between the partition member and the transfer case.

A power transmission mechanism comprising:

• a first casing structure defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer, and which is opened to an outside;
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber;
• and
• a gas-liquid separating device interposed between the transfer chamber and the connecting passage so that the transfer chamber and the connecting passage are connected through the gas-liquid separating device, wherein
• the first casing structure comprises a transmission case and the second casing structure comprises a transfer case joined with the transmission case in a joint surface,
• the atmospheric chamber is formed between the transmission case and the transfer case,
• the gas-liquid separating device is arranged to prevent passage of a lubricating oil from the transfer chamber to the connecting passage,
• the transmission case comprises a first wall, the transfer case comprises a second wall, and the atmospheric chamber is bounded between the first wall on one side of the joint surface and the second wall on the other side of the joint surface, and
• the first wall separates the atmospheric chamber from a transmission chamber receiving a transmission mechanism of the transmission.

A power transmission mechanism comprising:

• a first casing structure including a transmission case defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer;
• and
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber, the second casing structure including a transfer case joined to the transmission case in a joint surface,
• the atmospheric chamber being opened to an outside through a clearance in the joint surface between the transmission case and the transfer case.

A power transmission mechanism comprising:

• a first casing structure including a transmission case defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer;
• and
• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber, the second casing structure including a transfer case joined to the transmission case,
• one of the transmission case and the transfer case including a rib wall formed with a reinforcing rib and arranged to define the atmospheric chamber and to separate the atmospheric chamber from a transmission chamber containing a transmission mechanism, the rib wall surrounding a shaft drivingly connecting the transmission mechanism of the transmission with the transfer mechanism of the transfer.

A power transmission mechanism comprising a first casing structure defining an atmospheric chamber which is formed between a transfer and a transmission connected with the transfer, and which is opened to an outside:

• a second casing structure defining a transfer chamber receiving a transfer mechanism of the transfer, and defining a connecting passage through which the transfer chamber is connected to the atmospheric chamber;
• and
• a gas-liquid separating device interposed between the transfer chamber and the connecting passage so that the transfer chamber and the connecting passage are connected through the gas-liquid separating device;
• wherein the first casing structure includes a separating wall separating the atmospheric chamber from a transmission chamber containing a transmission mechanism;
• and
• wherein the power transmission mechanism further comprises the transmission and the transfer includes the transfer mechanism that apportions a driving torque of an engine between front and rear axles of a four wheel drive vehicle.