Patent ID: 8191696

Claim:
A torque transmission apparatus comprising: a coupling having first and second torque transmission members and a frictional clutch for transmitting a torque between the first torque transmission member and the second torque transmission member; and a stationary housing accommodating the coupling, wherein the coupling includes a first opening for introducing oil enclosed in the stationary housing into the coupling, the stationary housing includes first and second radial sidewalls and a first circumferential wall connecting the first and second radial sidewalls with each other, the first torque transmission member includes third and fourth radial sidewalls and a second circumferential wall connecting the third and fourth radial sidewalls with each other, the torque transmission apparatus has a spatial part defined by the first and third radial sidewalls, the second and fourth radial sidewalls and the first and second circumferential walls to enclose a predetermined amount of oil therein, and the spatial part includes an annular spatial part where a rotation of the first torque transmission member allows the oil to flow between the first circumferential wall and the second circumferential wall rotationally and flow along the first circumferential wall upwardly, and the first circumferential wall is formed so as to gradually increase a diameter from one side of the first torque transmission member in the direction of the rotating axis toward the other side.