| 摘要 |
An adjustable crank shaft for a pump or engine allows the stroke of the piston to be varied. The piston rod has a circular bushing that engages an outer diameter portion of an outer crank member. The outer crank member has an inner diameter portion with a circular crank surface that is eccentric to the outer diameter portion of the outer crank member. An inner crank member has an outer diameter portion in sliding engagement with the crank surface of the outer crank member. The inner crank member is rotatable about a main drive axis that is eccentric relative to the outer diameter portion of the inner crank member. The outer crank member has a set of gear teeth on an inner diameter portion that are eccentrically offset from the crank bushing surface. An adjustment gear is in engagement with the gear teeth and mounted on a gear shaft that is coaxial with the main drive axis. The outer crank member revolves about the adjustment gear as the piston strokes and the adjustment gear is stationary. Selectively rotating the adjustment gear cause the outer crank member to rotate to a different position relative to the inner crank member and changes the stroke of the piston.
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