| 摘要 |
An improved crankshaft connecting rod mechanism provides altered reciprocating motion of a piston attached to the connecting rods. The basic mechanism includes two, geared-together, counter-rotating crankshafts which are transversely aligned along parallel axes of rotation and symmetrically spaced apart. Two connecting rods are similarly aligned and have both ends on one side of the axis of linear reciprocation of a connected piston. The shafts of the two connecting rods are preferably displaced ("bent" in the lateral profile) toward the centerline. This bend in the connecting rod shafts may be of such a magnitude that they overlap during a portion of their motion by nesting together, utilizing male/female profiles on their inner side surfaces. The big ends of the two connecting rods may also be constructed so that they overlap. The connecting rods may have an arced profile that may be designed to flex during tension and compression during the reciprocating cycle of the piston. In this way, changes in the effective overall length of the rod may both increase the swept volume of the piston and beneficially increase the compression ratio at high RPM's. The cylinder, as well as portions of the crankcase, may include notches or clearance cuts on opposite sides of the cylinder to provide for passage of the connecting rods. This arrangement provides an extremely narrow engine for a two-wheeled vehicle, such as a motorcycle, which not only permits the motorcycle to have a greater angle of lean as it negotiates a curve, but also the use of two counter-rotating crankshafts annuls the gyroscopic effect of the engine and thus the motorcycle will require less force to change direction.
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