Jacobs Vehicle Systems, Inc.

Jacob Moore

John A Schwoerer

G Michael Gron, Jr

Thomas P Howell

Roger T Simpson

Justin D Baltrucki

Neil E Fuchs

Robb Janak

Zdenek S Meistrick

Timothy P Neal

Matei Alexandru

Bruce A Swanbon

Eric James Hodgkinson

Alan Steines

Steven Botellio

Zhi Qiang Chu

A compact, modular, lost motion variable valve actuation assembly includes a dry start hydraulic circuit to enable quick priming of a lost motion master-slave circuit from a dry start reservoir to the master piston chamber during engine start. Motion of the master piston on engine startup may draw in fluid from the dry start hydraulic circuit. The dry start components may be integrated into a compact modular rocker shaft pedestal package suitable for retrofit on existing engine head assemblies. The master piston may include a push tube interface that includes a deep push tube cavity and lubrication capabilities in the master piston that provides for improved wear, stability, easy installation and alignment. The slave piston may be provided with a valve catch to reduce valve closing velocity during cycles involving lost-motion.

Lost motion variable valve actuation systems and method

A system for controlling actuation of an engine valve comprises a pivot and a torsion spring having first and second legs operatively connected to the pivot. A lever arm is adjustably affixed to and extending away from the pivot, and is further rotatable about a pivot axis of the pivot between a retracted position and an extended position and vice versa relative to a motion conveying component. Furthermore, a housing is provided having a pivot bore formed therein with the pivot rotatably disposed in the pivot bore. The housing further comprises a first and second openings intersecting with the pivot bore such that the first and second legs extend out of the first opening and the lever arm extends out of the second opening. When a first force is applied by the motion conveying component to the lever arm, such first force maintains the lever arm in the extended position.

Rotating actuator system for controlling valve actuation in an internal combustion engine

Lost motion variable valve actuation systems and methods

A system that provides adjustable actuation timing of one or more valve(s) () in a piston engine includes a position sensor () and a variable valve actuation assembly (). The valve(s) () can be intake and/or exhaust valves in an internal combustion engine of an automobile. The position sensor () takes position readings of the valve(s) () as the valve(s) () actuate in the piston engine. The variable valve actuation assembly () controls actuation timing of the valve(s) (). Actuation timing of the valve(s) () is adjustable based, in part or more, upon one or more position reading(s) of the position sensor (). The variable valve actuation assembly () can be a lost motion assembly ().

System and method of adjusting actuation timing of valves in a piston engine

An exhaust brake and method of operating an exhaust brake are disclosed. The exhaust brake may have a housing having a central opening and a boss with a central bore, wherein the central bore intersects the central opening. A butterfly gate may be pivotally mounted in the central opening. The butterfly gate may have a bypass opening provided in an outer edge of the butterfly gate, and an upstream side. A dual-diameter piston may be slide-ably disposed in the central bore. The piston may have a lower end received in the bypass opening and an upper end distal from the bypass opening. One or more passages may extend between the central opening and the central bore at the upstream side of the butterfly gate, and a spring may bias the piston lower end into the bypass opening. The piston lower end may selectively unblock the bypass opening responsive to the application of static exhaust gas pressure to the piston upper end. The shape of the bypass opening and the piston lower end may be selected so that piston lower end fits closely within the bypass opening and thereby removes soot build up in the opening as a result of operation of the exhaust brake.

Exhaust brake

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Cromwell, CT, United States of America

Jacob Moore