| 摘要 |
A conventional internal combustion engine cylinder is provided with an integral downwardly extending housing formed by spaced wall portions tapering outwardly to an annular bottom end. A piston is reciprocable in the cylinder and the cylinder is provided with conventional intake and exhaust valves and a spark plug. An elongated connecting rod extends from the piston to the lower annular portion of the housing. The drive shaft extends into the center of the annular housing portion through one wall thereof. A crank arm extends at right angles from the end of the drive shaft. The crank arm is slotted from adjacent its outer end to adjacent the drive shaft. The end of the connecting rod is provided with a pin at right angles which extends through the slot in the crank arm. A guide channel or groove is cut in the housing wall through which the drive shaft extends. This groove is constructed from two circles, one centered on the axis of the drive shaft with a radius to the outer end of the slot in the crank arm, and the other centered on the upper end of the connecting rod with a radius equal to the length of the rod. The second circle forms an arc which truncates the first circle. The pin at the end of the connecting rod rides in this groove. Thus at the point of highest compression and at the time of the explosion, the connecting rod will be well past the vertical position, the slotted crank arm permitting movement from one side to the other without moving the piston downwardly to lose any of the power stroke. A further version provides a second groove portion, longer than the original groove, to allow the piston to travel an additional downward movement on the power stroke to utilize all of the explosive force and thus add to the efficiency.
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