Variable valve apparatus for internal combustion engine

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 phase control mechanism disposed at one end of the camshaft and adapted to control a rotational phase of the second camshaft member relative to the first camshaft member;
• a rotary cam mounted on one of the first and second camshaft members so as to rotate together with the one of the first and second camshaft members and allow opening and closing operations of an exhaust valve;
• an eccentric drive cam mounted on the other of the first and second camshaft members so as to rotate together with the other of the first and second camshaft members;
• 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 position of the control shaft and thereby control the amount of swinging movement of the swing cam;
• and
• an actuator for rotating the control shaft.

A variable valve apparatus for an internal combustion engine, comprising:

• a control shaft rotatably arranged on an cylinder head of the internal combustion engine;
• a camshaft rotatably arranged on an cylinder head of the internal combustion engine and having a first camshaft member to which rotation is transmitted from the internal combustion engine and a second camshaft member with a center thereof passing through the first camshaft member;
• a phase control mechanism disposed at one end of the camshaft and adapted to control a rotational phase of the second camshaft member relative to the first camshaft member;
• a rotary cam mounted on one of the first and second camshaft members so as to rotate together with the one of the first and second camshaft members and allow opening and closing operations of either one of intake and exhaust valves;
• a drive cam mounted on the other of the first and second camshaft members so as to rotate together with the other of the first and second camshaft members;
• a transmission mechanism for converting rotation of the drive cam to swinging movement and transmitting the swinging movement;
• a swing cam swingably supported on the control shaft and caused to swing with the swinging movement of the transmission mechanism and allow opening and closing operations of the other of the intake and exhaust valves;
• a control member integrally mounted on the control shaft and adapted to control the amount of the swinging movement of the transmission mechanism according to an operating phase thereof;
• and
• an actuator for rotating the control shaft.