Patent ID: 6880330

Claim:
A torque converter comprising: 1) a pump impeller connecting to an input shaft; 2) a turbine runner opposed to the pump impeller and connecting to an output shaft; and 3) a stator disposed between an inlet of the pump impeller and an outlet of the turbine runner, by way of a one way clutch which allows a one way rotation, wherein the torque converter is configured to transmit a power by circulating a fluid through the pump impeller, the turbine runner and the stator, wherein the torque converter defines an ellipticity, which is an outermost length of the torque converter in an axial direction divided by an outermost diameter of the torque converter in a radial direction, wherein the ellipticity is ≦0.23, and wherein when a first area ratio A, a second area ratio B and a third area ratio C are respectively defined as follows: A. at least one of the following: a) a fluid pass area of the outlet of the turbine runner, divided by an area of a circle defined by the outermost diameter of any one of the pump impeller and the turbine runner, or b) a fluid pass area of an inlet of the stator, divided by the area of the circle defined by the outermost diameter of the any one of the pump impeller and the turbine runner, B. at least one of the following: a) a fluid pass area of an outlet of the stator, divided by the area of the circle defined by the outermost diameter of the any one of the pump impeller and the turbine runner, or b) a fluid pass area of the inlet of the pump impeller, divided by the area of the circle defined by the outermost diameter of the any one of the pump impeller and the turbine runner, and C. at least one of the following: a) a fluid pass area of an outlet of the pump impeller, divided by the area of the circle defined by the outermost diameter of the any one of the pump impeller and the turbine runner, or b) a fluid pass area of an inlet of the turbine runner, divided by the area of the circle defined by the outermost diameter of the any one of the pump impeller and the turbine runner, the first area ratio A is in a following first range: 0.23<A≦0.45, the second area ratio B is in a following second range: 0.23<B≦0.45, and the third area ratio C is in a following third range: 0.15 ≦C<0.23.