Servo-assisted control system for the gears of a double...

Details Servo-assisted control system for the gears of a double... Servo-assisted control system for the gears of a double...

2005-07-08

2008-12-16

Le, David D. (Department: 3681)

Machine element or mechanism

Gearing

Interchangeably locked

C074S329000, C074S331000, C074S340000

Reexamination Certificate

active

07464617

ABSTRACT:
A control system including: first and second actuator devices for controlling the engagement of first and second sets of gears by selection and engagement movements, respectively; a first solenoid valve arranged to put the first or the second actuator device alternatively into communication with a fluid supply; a second solenoid valve arranged to control the selection movements of the actuator device which is in communication with the fluid supply; a distributor interposed between the fluid supply and the actuator devices and displaceable under the control of the first solenoid valve between a first position in which it puts the fluid supply into communication with the first actuator device and a second position in which it puts the fluid supply into communication with the second actuator device; third and fourth proportional pressure solenoid valves arranged to control the engagement movements of the actuator device which is in communication with the fluid supply.

REFERENCES:
patent: 4653352 (1987-03-01), Nakao et al.
patent: 5507197 (1996-04-01), Devaud et al.
patent: 6131476 (2000-10-01), Miyazaki
patent: 6658951 (2003-12-01), Harries
patent: 2002/0119864 (2002-08-01), Harries
patent: 101 25 172 (2002-11-01), None
patent: 101 34 115 (2003-01-01), None

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