| 摘要 |
A rotary hydraulic coupling of the type wherein the powered movement of a plurality of reciprocable pistons, which are carried and driven by a drive shaft, work in cylinders which are carried by a driven shaft, and wherein the varying backup pressure of incompressible fluid within the cylinders is relied upon to apply torque to and thus rotate the driven shaft. A sealed casing rotates in unison with the driven shaft and establishes an internal fluid reservoir, while the drive shaft projects into the casing and, by means of a crank arm, reciprocates the pistons. Inflow check valves leading from the reservoir allow fluid to be drawn into the cylinders while outflow check valves leading from the cylinders allow fluid to be forced directly into a manifold which is separated from the reservoir. The pressure attained in the manifold is reflected as backup pressure in the cylinders, such pressure varying the torque which is applied to the casing and driven shaft. A plurality of passages establish communication between the manifold and reservoir, while a novel valving arrangement variously controls the flow of fluid through such passages from the manifold to the reservoir in such a manner that a time delay is effected before full torque is applied to the output shaft. Means are provided whereby the extent of the time delay period may be varied.
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