Patent ID: 6776594
Filing Date: 2004-08-17
Classification: F04C

Abstract:
An improved rotor mechanism comprising a structure of intermeshing displacement rotor and valve rotor, the displacement rotor including a pair of lobes which has the same structure and is symmetrical about a rotary hub, each lobe including:a first arcuated surface providing an operation process from intake starting period to the period of ending; a second arcuated surface corresponding to the first arcuated surface to provide the operation process from exhaust starting period to the period of ending; and a third arcuated surface, a fourth arcuated surface, a first and a second convex surfaces which are connected between the first arcuated surface and the second arcuated surface to provide an operation process of carryover, the third arcuated surface being connected with the second arcuated surface, the fourth arcuated surface being connected between the third arcuated surface and the first convex surface, and the second convex surface being connected between the first convex surface and the first arcuated surface; the valve including a pair of lobes which has the same structure and is symmetrical about a rotary hub, each lobe including the corresponding arcuated surfaces and the convex surfaces which is defined by the relative rotation movement of the arcuated surfaces and the convex surfaces of the displacement rotor, and intermeshes with the arcuated surfaces and the convex surfaces of the displacement rotor, during the operation process from carryover period to the period of starting intake, the displacement rotor and the valve rotor being smoothly connected at the first and second convex surfaces, thereby providing the smooth and unhindered operation of the two rotors, wherein a maximum external radius of the displacement rotor and the valve rotor is designed R, a distance between the centers of the hubs of the two rotors is 4R/3, a pair of parallels being defined as drawing assistant lines, the surface being defined by the corresponding movement of the two rotors with a pair of tip portions which is defined by the corresponding rotation movement of the hubs of the two rotors as the operation ends and with the maximum external radius is the first convex surface.