Variable valve apparatus for internal combustion engine

摘要

A variable valve apparatus for an internal combustion engine includes a control shaft, a camshaft having first and second camshaft members rotatable relative to each other, a rotary cam rotating together with the second camshaft member for opening and closing of an exhaust valve, an eccentric drive cam rotating together with the first camshaft member, a rocker arm caused to swing with rotation of the eccentric drive cam, a swing cam caused to swing by the rocker arm for opening and closing of an intake valve, a control cam formed on the control shaft to change an operating position of the rocker arm according to a rotational phase of the control shaft and vary the amount of swinging movement of the swing cam, a phase control mechanism adapted to control a relative rotational phase of the first and second camshaft members and an actuator for rotating the control shaft.

主权项

1. A variable valve apparatus for an internal combustion engine, comprising:
a control shaft rotatably arranged on a cylinder head of the internal combustion engine; a camshaft rotatably arranged on the cylinder head of the internal combustion engine and having a first camshaft member to which rotation of a crankshaft of the internal combustion engine is transmitted and a second camshaft member inserted and supported in an axial hole of the first camshaft member such that the first and second camshaft members are rotatable relative to each other; a rotary cam mounted on the second camshaft member so as to rotate together with the second camshaft member and allow opening and closing operations of an exhaust valve; an eccentric drive cam mounted on the first camshaft member so as to rotate together with the first camshaft member; a rocker arm swingably supported on the control shaft and caused to swing with rotation of the eccentric drive cam; a swing cam swingably supported on the control shaft and caused to swing with swinging movement of the rocker arm and allow opening and closing operations of an intake valve; a control cam formed eccentrically on the control shaft so as to rotate together with the control shaft, change an operating position of the rocker arm according to a rotational phase of the control shaft and thereby vary the amount of swinging movement of the swing cam; a phase control mechanism adapted to control a rotational phase of the second camshaft member relative to the first camshaft member; and an actuator for rotating the control shaft.