| 摘要 |
1,261,546. Balancing machinery; converting rotary motion into reciprocating motion. SHIZUOKA DAIGAKU CHO. 17 Jan., 1969 [30 Jan., 1968 (2)], No. 2740/69. Headings F2Q and F2X. [Also in Division F1] In a mechanism for converting reciprocating linear motion to rotary motion or vice versa for machine tools, riveters, chisels, hammers or cutters and sewing, spinning, weaving and spring-testing machines, a crank-shaft is journalled in at least one eccentric collar means rotatably supported by the casing of the machine and having an eccentricity equal to that of the crank-pin, the eccentric collar means being arranged by means of an eccentric-gear or hypocycloidal mechanism to rotate at the same angular velocity as the crank-shaft but in the opposite direction so as to provide linear motion of a rod connecting the crank-pin to a reciprocating member, and balance weights are secured to the crank-shaft and the eccentric collar means. The mechanism is described as applied to an I.C. engine, Figs. 6 and 7, comprising a crank-shaft 4 journalled in eccentric collars 5, 6 which in turn are journalled in bearings 13. A gear 12 on the crank-shaft meshes with an eccentric gear 25 on a shaft 23, and a gear 24 on the shaft 23 meshes with a gear 18 on an output shaft 17. The gear 18 and a further gear 19 on the shaft 17 mesh with respective gears 15 and 16 to cause the eccentric collars 5, 6 to rotate at the same speed as the crank-shaft 4 but in the opposite direction. The effect of this arrangement is that the piston-rod 1 moves in a straight line along the cylinder axis. Balance weights m 1 and m 2 are provided. In another embodiment, Figs. 8 and 9 (not shown), the mechanism providing straight-line motion is of the hypocycloidal type comprising planet gears (40, 41) on the crankshaft (33, 34), meshing with stationary annulus gears (42, 43) having twice as many teeth as the planet gears. An output shaft (48) is driven from the eccentric collars (36, 37) through gearing (44, 46) and (45, 47). The piston-rod can be divided for the insertion of a spring means for accommodating torque variation. |
