Cummins Engine Company, Inc.

Brett I Barnhart

John D Crofts

Terrence M Shaw

David M Rix

Harry L Wilson

Jay F Leonard

William R Storkman

Rodney M Shurman

Timothy D Britt

James D Curtis

Matthew G Leddy

David H Parsons

Al Slachter

Alan B Slachter

An assembly including an engine component, such as a fuel injector, seated against a seating surface of a cylinder head is provided with a positive seal contact an uppermost point of contact between an injector sleeve and a seating surface of the cylinder head. The positive seal contact prevents coolant from the water jacket from travelling below the uppermost point of contact, thereby avoiding cavitation damage which might otherwise occur by the entrapment of liquid between the cylinder head seating surface and the injector sleeve. In an embodiment, a raised annular ridge is formed in the seating surface of the cylinder head at the location of the uppermost point of contact. This ridge becomes embedded in the injector sleeve. Also, in an embodiment, the cylinder head includes a circular recess upwardly from the uppermost point of contact. Although coolant from the water jacket can enter the recess, the recess radially separates the cylinder head from the injector sleeve by an amount that will not be closed under deflection due to cyclic loading on the injector.

Fuel injector seat assembly with positive contact seal between fuel

A solenoid valve is disclosed including a valve housing having a central bore and a valve seat, a valve element movable between an open position allowing fluid to pass through said valve seat and a closed position in sealing engagement with said valve seat, a valve operator for moving the valve element between the open and closed positions including a reciprocating armature plunger member extending through the bore and an armature secured to the armature plunger, a valve adjustment for adjustably mounting the valve element relative to the valve operator for permitting adjustment to within an acceptable tolerance of a predetermined distance between the valve element and the valve seat when the valve element is in its open position without creating a path of leakage when the valve element is in its closed position. A valve adjustment securing mechanism is provided for securing the armature to an armature end of the armature plunger and a load bearing insert is secured within the armature for bearing a load exerted by the armature plunger during reciprocation of the valve element to allow for surface contact during the valve operation without surface wear.

Captured ring and threaded armature solenoid valve

A valve stroke adjustment locking mechanism comprising a valve seat having an axially extending bore therethrough and a seating surface. A valve operator is provided having an elongated member which is extended through the axial bore and is reciprocatable between a first open position and a second closed position. The elongated member includes a threaded end portion which extends from the valve seat for accommodating a valve assembly which is provided with a top portion forming a sealing face and a bottom portion having a central opening adapted to receive the threaded end portion of the elongated member. A closed end nut threadingly engages the threaded end portion of the elongated member and contacts the valve assembly for positioning the sealing surface a predetermined spacing from the seating surface. A transverse hole is then electromechanically discharge machined transversely through the closed end nut and the threaded end portion of said piston member and a pressure fit pin is forced into the hole to rigidly fix the closed end nut relative to the elongated member in order to maintain the predetermined spacing without forming any paths of leakage.

Solenoid valve stroke adjustment locking mechanism and method of forming

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Franklin, IN, United States of America

Brett I Barnhart