F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
74/168, 74/176,
F15B 13/02 (2006.01) F15B 13/043 (2006.01) F16H 59/04 (2006.01)
Patent
CA 1238552
ELECTROHYDRAULIC CONTROL OF A SPOOL VALVE FOR ENERGIZING A HEAVY DUTY AUTOMATIC TRANSMISSION CLUTCH Abstract of the Disclosure An electrohydraulic control system comprising a spool valve including a body having a bore. A spool is positioned in the bore for reciprocating movement within the bore. The valve body has an inlet, an outlet and an exhaust port. An electro- hydraulic three-way normally closed pulse width modulated valve has an inlet communicating with the inlet to the valve body and an outlet communicating with one end of the spool. An electro- hydraulic three-way normally closed ON/OFF valve has an inlet communicating with the outlet of the body and an outlet communicating with the other end of the spool. A spring yieldingly urges the spool toward the pulse width modulated valve. The spool is positioned so that it normally obstructs a path from the inlet to the outlet.
488641
Marks & Clerk
Sealed Power Corporation
LandOfFree
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