Electrohydraulic control of a spool valve for energizing a heavy duty automatic transmission clutch
AssigneeSealed Power Corporation
InventorJohn Hendrixon
Life of this patent
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Abstract
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 electrohydraulic 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 electrohydraulic 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.
Claims6
An electrohydraulic control system comprising
- a spool valve including a body having a bore,
- a spool positioned in the bore for reciprocating movement within the bore,
- said valve body having an inlet, an outlet and an exhaust port intersecting said bore,
- said spool being operable to selectively control the flow of fluid from said inlet to said exhaust, and said outlet,
- an electrohydraulic three-way normally closed pulse width modulated valve having an inlet communicating with the inlet to said valve body and an outlet communicating with one end of said spool,
- an electrohydraulic three-way normally closed ON/OFF valve having an inlet communicating with the outlet of said body and an outlet communicating with the other end of said spool.
Dependencies are inferred from the claim text.