Hydromechanical transmission with hydrodynamic drive

Patent · Mon Jan 01 00:00:00 EST 1979

OSTI ID:863255

Weseloh, William E ^[1]

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1. San Diego, CA

This transmission has a first planetary gear assembly having first input means connected to an input shaft, first output means, and first reaction means, and a second planetary gear assembly having second input means connected to the first input means, second output means, and second reaction means connected directly to the first reaction means by a reaction shaft. First clutch means, when engaged, connect the first output means to an output shaft in a high driving range. A hydrodynamic drive is used; for example, a torque converter, which may or may not have a stationary case, has a pump connected to the second output means, a stator grounded by an overrunning clutch to the case, and a turbine connected to an output member, and may be used in a starting phase. Alternatively, a fluid coupling or other type of hydrodynamic drive may be used. Second clutch means, when engaged, for connecting the output member to the output shaft in a low driving range. A variable-displacement hydraulic unit is mechanically connected to the input shaft, and a fixed-displacement hydraulic unit is mechanically connected to the reaction shaft. The hydraulic units are hydraulically connected together so that when one operates as a pump the other acts as a motor, and vice versa. Both clutch means are connected to the output shaft through a forward-reverse shift arrangement. It is possible to lock out the torque converter after the starting phase is over.

• Research Organization: Orshansky Transmission Corp., San Diego, CA (USA)
• DOE Contract Number: EY-76-C-03-1165
• Assignee: Orshansky Transmission Corporation (New York, NY)
• Patent Number(s): US 4134310
• OSTI ID: 863255
• Country of Publication: United States
• Language: English

Related Subjects

hydromechanical
transmission
hydrodynamic
drive
planetary
gear
assembly
input
means
connected
shaft
output
reaction
directly
clutch
engaged
connect
driving
range
example
torque
converter
stationary
pump
stator
grounded
overrunning
turbine
starting
phase
alternatively
fluid
coupling
type
connecting
variable-displacement
hydraulic
unit
mechanically
fixed-displacement
units
hydraulically
operates
motor
vice
versa
forward-reverse
shift
arrangement
lock
output means
hydraulic units
connected directly
mechanically connected
gear assembly
output shaft
input shaft
planetary gear
means connected
vice versa
input means
hydromechanical transmission
torque converter
hydraulic unit
mechanically connect
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