Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1988-07-14
1990-01-09
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
74471R, 74479, 74766, 74781R, 188 16, 188 77R, 188105, 188170, 303 2, 303 71, B60T 1300
Patent
active
048923605
ABSTRACT:
The brake activation apparatus comprises first and second brake devices capable of being selectively applied, a shifting mechanism for selectively applying either the first or second brake device and not the other, a mechanism for overriding the shifting mechanism for applying both of the first and second brake devices, and a mechanism for releasing the override during both normal and manual operation. The apparatus is useful in a power drive unit comprising a carrier having first and second planetary gears rotatably mounted on the carrier, first and second rotatably mounted sun gears in meshing engagement with the respective planetary gears, the sun gears each having a drive output portion for driving respective devices and a braking portion for cooperation with the first and second brake devices to control the output of the power drive unit by selectively braking the respective sun gears.
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Butler Douglas C.
Sundstrand Corporation
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