Exedy Corporation

Daikin Clutch Corporation

Kozo Mori

Takao Fukunaga

Yukiyoshi Takada

An impeller, a turbine, and a stator form a torus of a torque converter. A elliptic ratio L/H of an axial length L of the torus to a radial height H of the torus is 0.72 or smaller. A diameter ratio (D/D) of an inner diameter Dof the torus to an outer diameter Dof the torus is 0.45 or greater. The impeller includes an impeller core, and an impeller axial length ratio (Lp/D) of an axial length Lp of the impeller core to the outer diameter Dof the torus is in a range between 0.030 to 0.045. The turbine includes a turbine core, and an turbine axial length ratio (Lt/D) of an axial length Lt of the turbine core to the outer diameter Dof the torus is in a range between 0.021 to 0.029.

Torque converter

In a torque converter provided with a lockup device, performance of a torsion spring is improved, preferably by increasing its size, while suppressing an increase of an axial dimension of the torque converter. The torque converter includes a toric fluid actuating portion having an impeller, a turbine, and a stator. A ratio (D /D ) of an inside diameter D to an outside diameter D of the fluid actuating portion is equal to or greater than 0.61.

A torque converter equipped with a lockup device is provided to secure sufficient space in the axial direction for the damper in a hydraulic torque transmitting device provided with a lockup device having a damper. Lockup device is disposed between a front cover and a turbine Lockup device has a clutch mechanism for mechanically coupling front cover and turbine and a damper mechanism for absorbing and attenuating torsional vibrations. In the vicinity of its outlet, turbine has a linearly shaped part that is aligned with damper mechanism As a result, the axial dimensions of torsion springs can be enlarged.

Hydraulic torque transmitting device

A torque convertor having a tubular toroidal member constituted by a pump, a turbine and a stator is so dimensioned that sufficient room is provided to accommodate associated components without sacrificing performance standards. In particular, since the cross sectional area of the flow passage of the stator, wherein eddies tend to generate and power transmission loss due to fluid collision increases, is larger in proportions to the cross sectional area of either the pump or the turbine the fluid turbulence is reduced.

Growing community of inventors

Osaka, Japan

Kozo Mori