Marine engines having cam phaser
AssigneeBrunswick Corporation
InventorsThomas F. Nickols, Daniel P. Hoffman
Life of this patent
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Abstract
A marine engine has an intake camshaft, an exhaust camshaft, and a crankshaft. Combustion in the marine engine causes rotation of the crankshaft which in turn causes rotation of the intake camshaft and exhaust camshaft. Rotation of the intake camshaft operates intake valves for controlling inflow of air to the marine engine. Rotation of the exhaust camshaft operates exhaust valves for controlling outflow of exhaust gas from the marine engine. A cam phaser is located at least partially inside at least one of the intake camshaft and the exhaust camshaft and is configured to vary a timing of operation of at least one of the intake valves and exhaust valves.
Claims18
A marine engine comprising:
- a crankshaft;
- and
- at least one dual overhead cam (DOHC) assembly including:
- a first camshaft rotationally coupled to the crankshaft;
- a second camshaft rotationally coupled to the first camshaft;
- a plurality of cylinders;
- and
- a cam phaser located at least partially inside the first camshaft, the cam phaser comprising a rotatable member arranged along the first camshaft at a position between adjacent cylinders of the plurality of cylinders,
- wherein the second camshaft is rotationally coupled to the first camshaft via the rotatable member such that the cam phaser is configured to vary a timing of operation of the second camshaft with respect to the first camshaft,
- wherein the first camshaft is one of an intake camshaft and an exhaust camshaft, and
- wherein the second camshaft is a remaining one of the intake camshaft and the exhaust camshaft.
A marine engine comprising:
- a crankshaft;
- and
- at least one dual overhead cam (DOHC) assembly including:
- a first camshaft rotationally coupled to the crankshaft;
- a second camshaft rotationally coupled to the first camshaft;
- plurality of cylinders;
- and
- a cam phaser configured to vary a timing of operation of the second camshaft with respect to the first camshaft,
- wherein the first camshaft is formed as an assembly including a first camshaft portion and a separate second camshaft portion,
- wherein the second camshaft is rotationally coupled to the first camshaft via a rotatable member of the cam phaser,
- wherein the rotatable member is located along the first camshaft at a position axially between the first camshaft portion and the second camshaft portion,
- wherein the first camshaft is one of an intake camshaft and an exhaust camshaft, and
- wherein the second camshaft is a remaining one of the intake camshaft and the exhaust camshaft.
Dependencies are inferred from the claim text.