High efficiency torque converter

Details High efficiency torque converter High efficiency torque converter

2006-12-26

2006-12-26

Nguyen, Hoang (Department: 3748)

Power plants

Pressure fluid source and motor

Coaxial impeller and turbine unit

C416S180000

Reexamination Certificate

active

07152399

ABSTRACT:
A torque converter assembly is provided, which includes an impeller, a turbine, and a stator. The impeller and the turbine each have a plurality of passages for directing fluid. The inlet and outlet of each passage are larger in cross-sectional area than the middle portion of the passage, located between the inlet and outlet. This structure reduces energy losses, which typically occur near the midpoint of the passage due to flow separation. Additionally, reducing the flow area of the torus of the impeller and turbine permits an overall thinner torque converter, which is preferred for engine packaging purposes. The stator includes a core, a shell, and a plurality of stator blades. One end of each stator blade is fixed to the core, while the opposite end is fixed to the shell. Each stator blade has a mean camber line and an associated mean camber line length. The maximum thickness of each stator blade is approximately 20% of the mean camber line length. Each stator blade has a midsection located between the ends affixed to the core and the shell. The midsection of each stator blade has a larger cross-sectional area than either end of the blade. This stator blade structure creates a larger stator blade surface, which is more effective at re-directing fluid within the torque converter.

REFERENCES:
patent: 3320747 (1967-05-01), Denes
patent: 3330111 (1967-07-01), Denes
patent: 4177885 (1979-12-01), Ross
patent: 5005356 (1991-04-01), Saunders
patent: 5431536 (1995-07-01), By et al.
patent: 6746369 (2004-06-01), Tsunekawa et al.

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