Reed valve VCT phaser with worm trails

#1. Field of the Invention

#The invention pertains to the field of variable camshaft timing (VCT) systems. More particularly, the invention pertains to a vane-type variable cam timing device employing worm trail reed valves to a flow of hydraulic fluid.

#2. Description of Related Art

#FIG. 1A shows a rotor in an embodiment of the present invention.

#FIG. 1B shows a reed plate in an embodiment of the present invention.

#FIG. 1C shows a spacer in an embodiment of the present invention.

#The “phaser” is all of the parts of the engine which allow the camshaft to run independently of the crankshaft.

#The present invention overcomes the shortcomings of the prior art check valves. One advantage is that the reed valve does not have to be opened as far to get adequate flow. Since the whole area of the reed valve can open up, it allows for more flow volume. In addition, since the prior art check valves sit on a flat surface, it takes effort to unseat the valve. In contrast, the reed valves of the present invention act like a zipper, and open more easily and quickly. Also, the amount of area available for packaging is increased. Replacing the multiple pieces of the prior art check valves with a single reed plate makes the check valves less expensive.

#FIGS. 1A through 1C show a rotor (1), a reed plate (11) and a spacer (15). These three components are combined to form FIG. 2. As FIG. 2 shows, the spacer (15) is preferably stacked and concentric to the reed plate (11), which is preferably stacked and concentric to the rotor (1) when the device is in use. In a preferred embodiment, the reed plate (11) is approximately 0.3 mm thick. The thickness of the spacer (15) depends on the thickness of the grooves, or worm trails. In a preferred embodiment, the grooves are approximately 4 mm deep, and the spacer is approximately 10-15 mm thick.