Importance

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Abstract

A variable valve device changes a valve lift amount in a cylinder head. The device includes: a camshaft having plural cams with different valve lift amounts; plural rocker arms in contact with the plural cams to move a valve; a switching mechanism that couples and separates the plurality of rocker arms by oil pressure; and an oil control valve that control the oil pressure. The switching mechanism includes a coupling piston and a separation piston that are moved forward and backward by the oil pressure. The plural rocker arms are coupled to one another along forward movement of the coupling piston. The plural rocker arms are separated from one another along forward movement of the separation piston. The oil control valve moves the coupling piston forward at a predetermined rotation phase of the camshaft and moves the separation piston forward at a predetermined rotation phase of the camshaft.

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First Claim