Engine valve actuation system

US6907851B2 · kind B2 · utility

Assignee

• Caterpillar Inc. · US

Inventors

• Travis E. Barnes · Peoria, US
• Judson R. Bruce · Chillicothe, US
• Sean O. Cornell · Gridley, US
• Douglas E. Handly · Morton, US
• Scott Leman · Eureka, US
• David M. Milam · Dunlap, US
• Wade J. Robel · Peoria, US
• Di Wu · Tangxia, CN

Key dates

• Filing date: Dec 4, 2002
• Grant date: Jun 21, 2005
• Expiry date: Dec 4, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An engine valve actuation system is provided. The engine valve actuation system includes an intake valve that is moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid. A cam assembly is configured to move the intake valve between the first position and the second position. A fluid actuator is configured to selectively prevent the intake valve from moving to the first position. A source of fluid is in fluid communication with the fluid actuator. A directional control valve is configured to control a flow of fluid between the source of fluid and the fluid actuator. A check valve is disposed between the directional control valve and the source of fluid, only allowing fluid flow from the fluid source to the directional control valve. A bleed orifice may be disposed between the directional control valve and the source of fluid, in parallel with the check valve.