Cummins Inc.

Darren Yaoshun Ting

David M Barnes

Patrick M Pierz

For a given cylinder in the engine having two intake valves and two exhaust valves, one of the intake valves is driven by a bucket tappet, while the other intake valve is actuated via a roller finger follower. Similarly, one of the exhaust valves is driven by a bucket tappet, while the other exhaust valve is actuated via a roller finger follower. The intake valves read inputs form an intake camshaft, and the exhaust valves read inputs from an exhaust camshaft.

Hybrid valve train system

An apparatus and method are disclosed for an injector assembly including an injector tip having a prechamber, such as a permanent, passive prechamber (PPPC), and a nozzle combustion shield (NCS) to mitigate pre-ignition events, such as knocking, caused by overheating of the prechamber. The NCS has a thermal conductivity greater than the injector tip. The NCS optionally includes a barrel forming a slip fit with the cylinder head bore and forming a press fit with the injector tip. The NCS also optionally includes a brim to form a combustion seal with a cylinder head. As the spark plug ignites a fuel charge in the prechamber, heat is absorbed into the injector tip, flows into the NCS barrel, out of the NCS brim, and into the cylinder head for cooling via a cooling jacket.

Nozzle combustion shield

A valve train assembly is provided, comprising an exhaust camshaft having an exhaust lobe and a brake lobe, an exhaust lever mounted adjacent the exhaust lobe, a brake lever mounted adjacent the brake lobe, wherein the exhaust lever is coupled to the brake lever to provide simultaneous movement of the exhaust lever and the brake lever in response to the exhaust lobe and independent movement of the brake lever in response to the brake lobe.

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Columbus, IN, United States of America

Darren Yaoshun Ting