Automatic transmissions using compact hydrodynamic torque conver

Details Automatic transmissions using compact hydrodynamic torque conver Automatic transmissions using compact hydrodynamic torque conver

1993-10-15

1995-03-07

Look, Edward K.

Power plants

Pressure fluid source and motor

Coaxial impeller and turbine unit

60330, 416197C, 417169, 417197, F16D 3300

Patent

active

053946944

ABSTRACT:
A three element, three phase hydrodynamic torque converter having improved structural and hydrodynamic characteristics, and automatic transmissions that use a plurality of such hydrodynamic torque converters as replacements for multiple disc wet clutches or the like to effect transmission ratio changes. The hydrodynamic torque converters use a centrifugal impeller and a centrifugal turbine on the forward axial side of the torque converter, and a centripetal stator mounted to the converter shell on the rearward axial side. Three phase operation results when using the specified geometries: [1] torque multiplication, where the speed ratio i=n.sub.t
.sub.p is greater than one; [2] coupling phase, where the speed ratio approaches one; [3] extension phase, where the speed ratio equals one and then exceeds one. For operation with speed ratio i=n.sub.t
.sub.p in the range 0.6 .ltoreq.i .ltoreq.1.3, operational efficiency .eta. is found to be between 82 and 88 percent. Due to the specifed geometries, the torque coefficient .lambda..sub.1 increases with increasing speed ratio i. The three phase hydrodynamic torque converters make possible a shifting coupling type transmission in which multiple power transmitting paths are individually coupled to independent torque converters. Energizing each power transmitting path results in effecting a different transmission ratio. The individual power transmitting paths are selectively energized by filling with hydraulic fluid the corresponding torque converter, while all other torque converters are voided automatically by the inherent automatic operation of an associated multi-nozzle Bernoulli fluid ejector, also described herein.

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