Method of transforming a reciprocating rectilinear movement into a circular movement or conversely

摘要

460,936. Converting reciprocating into rotary motion. MARCHOU, E. R. March 17, 1936, No. 8001. Convention date, March 20, 1935. [Class 80 (i)] [Also in Groups XXVI, XXVII, and XXVIII] In mechanism for converting reciprocating into rotary motion and vice versa, applicable to steam and internal-combustion engines, compressors and pumps, a shaft 1 has a crank 2, on the pin 3 of which is loosely mounted a toothed wheel 4 in constant mesh with an internal gear ring 5 fixed relatively to the machine frame. The diameter of wheel 4 is half that of the gear ring. On the face of wheel 4 is eccentrically secured a disc 6 the centre of which is at 7, and this disc is surrounded by a strap 8 to which is secured a connecting-rod 9 connected to a piston 10. The locus of the centre 7 during a complete revolution is an ellipse, the slope of the axes of which can be varied by variation of setting of the toothed wheel 4. The movement of the piston 10 from upper dead-centre position differs from that of an ordinary crank drive, in fact the point 7 may even rise after the crank 3 has passed its vertical position, thus increasing the force of expansion of the gases in an internal-combustion engine.