초록 ▼

A valve control apparatus is provided for an internal combustion engine having a valve and a camshaft. The camshaft has an axis of rotation, a first raised portion and a second raised portion adjacent to the first raised portion. The second raised portion is angularly spaced-apart about the axis fro

A valve control apparatus is provided for an internal combustion engine having a valve and a camshaft. The camshaft has an axis of rotation, a first raised portion and a second raised portion adjacent to the first raised portion. The second raised portion is angularly spaced-apart about the axis from the first raised portion. The apparatus includes a follower operatively engagable with the camshaft and the valve. The follower has a first operational mode where the first raised portion operatively engages the follower on each revolution of the camshaft to open the valve a first time on each revolution. There is a mechanism for selectively putting the follower in a second operational mode where the second raised portion operatively engages the follower to open the valve a second time on each revolution of the camshaft. The mechanism puts the follower in the second operational mode on each revolution of the camshaft before the second raised portion is fully aligned with the follower. The mechanism has a device which returns the follower to the first mode after the valve is opened by the second raised portion and before the first raised portion fully operatively engages the follower. Maximum opening and closing of the valve by the first raised portion is thereby unaffected when the mechanism selectively puts the follower in the second operational mode. The device is triggered by the camshaft or by relative movement between a portion of the rocker arm assembly and the valve.

대표청구항 ▼

1. A valve control apparatus for an internal combustion engine having a valve and a camshaft, the camshaft having an axis of rotation, a first raised portion and a second raised portion, the second raised portion being angularly spaced-apart about the axis from the first raised portion, the apparatu

1. A valve control apparatus for an internal combustion engine having a valve and a camshaft, the camshaft having an axis of rotation, a first raised portion and a second raised portion, the second raised portion being angularly spaced-apart about the axis from the first raised portion, the apparatus comprising:a follower operatively engagable with the camshaft and the valve, the follower having a first operational mode where the first raised portion operatively engages the follower on each revolution of the camshaft to open said valve a first time on each revolution on the camshaft and where the second raised portion operatively clears the follower on each revolution of the camshaft without actuating said valve; and a mechanism for selectively putting the follower in a second operational mode where the second raised portion operatively engages the follower to open said valve a second time on each revolution of the camshaft, the mechanism putting the follower in the second operational mode on each revolution of the camshaft before the second raised portion rotates completely to alignment with the follower, the mechanism having a device which returns the follower to the first operational mode after the valve is opened by the second raised portion and before the first raised portion fully opens the valve, whereby maximum opening and normal closing of the valve by the first raised portion is unaffected when the mechanism selectively puts the follower in the second operational mode, the device being triggered by the device being triggered by the first raised portion.