BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.
FIG. 1 is a perspective view showing an engine on which a variable valve device according to a first embodiment of the invention is mounted;
FIG. 2 is a perspective view showing the whole of both inlet and exhaust variable valve devices of one of cylinders mounted on a left bank of the engine shown in FIG. 1;
FIG. 3 is a plan view showing the inlet and exhaust variable valve devices of the one cylinder shown in FIG. 2 when viewed from an arrow A of FIG. 2;
FIG. 4 is a plan view showing a layout of various cams of a camshaft;
FIG. 5 is a sectional view showing the variable valve device on the inlet side (low speed) when viewed from an arrow B of FIG. 3;
FIG. 6 is a sectional view showing the variable valve device on the inlet side (high speed) when viewed from an arrow C of FIG. 3;
FIG. 7 is a sectional view showing the variable valve device on the exhaust side when viewed from an arrow D of FIG. 3;
FIG. 8 is a sectional view showing a non-lift cam and a periphery thereof when viewed from an arrow E of FIG. 3;
FIG. 9 is a perspective view showing the whole of the variable valve device on the inlet side;
FIG. 10 is a perspective view showing a state in which the variable valve device on the inlet side is taken apart into a cam follower rocker and a valve drive rocker;
FIG. 11 is a perspective view showing the whole of the variable valve device on the exhaust side;
FIG. 12 is a perspective view showing a state in which the variable valve device on the exhaust side is taken apart into the cam follower rocker and the valve drive rocker;
FIG. 13 shows states of various valve lifts provided by the inlet and exhaust variable valve devices;
FIG. 14 is an exploded perspective view showing a main part of a variable valve device according to a second embodiment of the invention;
FIG. 15 is an exploded perspective view showing a main part of a variable valve device according to a third embodiment of the invention; and
FIG. 16 is perspective view showing a state in which a sleeve is taken apart from each cylinder of the valve drive rocker shown in FIG. 15.