2-step variable valve lift apparatus actuated by dual roller bearings using electromagnetic system

摘要

A variable valve lift apparatus may include a camshaft, a cam lobe including at least one low lift cam and at least one high lift cam, and formed or mounted on an exterior circumference of the camshaft, and a cam follower opening a valve with a low lift or a high lift or closing the valve by a rotation of the camshaft. The cam follower may include a valve lift body pivoting on one side and opening or closing the valve by the cam lobe when the camshaft rotates, a bearing shaft fixedly mounted in the valve lift body, and at least one rolling bearing rotatably mounted on the bearing shaft and being movable axially on the bearing shaft to make contact selectively with the low lift cam or the high lift cam.

主权项

1. A variable valve lift apparatus comprising:
a camshaft; a cam lobe including at least one low lift cam and at least one high lift cam, the cam lobe formed or mounted on an exterior circumference of the camshaft; and a cam follower opening a valve with a low lift or a high lift or closing the valve by a rotation of the camshaft, wherein the cam follower comprises:
a valve lift body pivoting on one side thereof and opening or closing the valve by the cam lobe when the camshaft rotates;a bearing shaft fixedly mounted in the valve lift body wherein the bearing shaft comprises an insulated coil mounted in the bearing shaft and the insulated coil generates magnetic force at both ends of the bearing shaft while an electric current flows through the insulated coil; andat least one rolling bearing including a permanent magnet rotatably mounted on the bearing shaft and being movable axially on the bearing shaft according to the magnetic force of the insulated coil to make contact selectively with the low lift cam or the high lift cam.