| 摘要 |
1281713 Variable speed gearing W A WARNOCK 16 July 1969 [16 July 1968] 35897/69 Heading F2D A variable speed gearing comprises two shafts A, B having axes relatively displaceable eccentrically to vary the ratio and including a flexible endless drive member, e.g. chain 25 or 32. The shaft A may be movable eccentrically by mounting in a bell-crank pivotable about a pin 46 under the action of manually adjustable (at 52, 63) screws 50, 64. The shaft A may be between two chain drives D between two coaxial shafts B or be driven by gears 58, 59 from a shaft 17. Each chain 25, 32 may engage teeth of a sprocket 26 fixed to shaft A and pass round freely rotatable heads on pins 28, 29 fixed to a flywheel C, and on pins 34 on arms biased by springs 38 to pivot about pins 36 in the flywheel to tension the chain. It is stated that as the shafts AB move relatively eccentrically from a coaxial position the ratio reduces from direct drive. |
