Clutch with dual area piston and independent pressure control

Details Clutch with dual area piston and independent pressure control Clutch with dual area piston and independent pressure control

2011-03-29

2011-03-29

Lorence, Richard M. (Department: 3655)

192 clutches and power-stop control

Clutches

Operators

C192S052400, C192S085630

Reexamination Certificate

active

07913828

ABSTRACT:
The present invention provides a clutch having two pistons, a first piston defining a first, smaller area and a second piston, defining a second, larger area. The separate pistons are independently provided with flows of pressurized hydraulic fluid from first and second independent modulatable control valves. Engagement of the clutch may be rapid by providing hydraulic fluid to the smaller area piston, provide greater engagement force by providing hydraulic fluid to the larger area piston or a combination of speed and force by utilizing modulated or unmodulated flows of hydraulic fluid to both pistons.

REFERENCES:
patent: 4875561 (1989-10-01), Schneider et al.
patent: 5950787 (1999-09-01), Murasugi et al.
patent: 7104380 (2006-09-01), Bishop et al.

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