Hybrid valve train system
AssigneeCummins Inc.
InventorsDarren Yaoshun Ting, David M. Barnes
Life of this patent
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Abstract
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.
Claims20
A hybrid valve train for a cylinder of an internal combustion engine, comprising:
- a cylinder head;
- and
- a valve assembly mounted to the cylinder head, the valve assembly including:
- a first bucket tappet operably connected to a first intake valve,
- a first roller finger follower operably connected to a second intake valve,
- a second bucket tappet operably connected to a first exhaust valve, and
- a second roller finger follower operably connected to a second exhaust valve.
A hybrid valve train for a cylinder of an internal combustion engine, comprising:
- a cylinder head;
- a valve assembly mounted to the cylinder head, the valve assembly including:
- a bucket tappet connected to a first intake valve,
- a roller finger follower connected to a second intake valve;
- and
- an intake camshaft including:
- a bucket tappet intake lobe in contact with the bucket tappet of the first intake valve to execute a tappet intake lift profile, and
- a roller finger follower intake lobe in contact with the roller finger follower of the second intake valve to execute a rocker intake lift profile.
A hybrid valve train for a cylinder of an internal combustion engine, comprising:
- a cylinder head;
- a valve assembly mounted to the cylinder head, the valve assembly including:
- a bucket tappet operably connected to a first exhaust valve,
- a roller finger follower operably connected to a second exhaust valve;
- and
- an exhaust camshaft including:
- a bucket tappet exhaust lobe in contact with the bucket tappet of the first exhaust valve to execute a tappet exhaust lift profile, and
- a roller finger follower exhaust lobe in contact with the roller finger follower of the second exhaust valve to execute a rocker exhaust lift profile.
Dependencies are inferred from the claim text.