초록 ▼

A ring gear of a helically splined rotary actuator is separately and independently joined to the outer cylindrical body of the actuator and meshes with the splined piston sleeve of the rotary actuator. The outer cylindrical body is a smooth, continuous body. In one form of the invention, the ring ge

A ring gear of a helically splined rotary actuator is separately and independently joined to the outer cylindrical body of the actuator and meshes with the splined piston sleeve of the rotary actuator. The outer cylindrical body is a smooth, continuous body. In one form of the invention, the ring gear is secured to the outer cylindrical body with flush mountings so that the entire body can be slid past end seals of a hollow boom or further outermost cylindrical tube. In a preferred embodiment, the ring gear is loosely joined to the outer cylindrical body so that it can conform to irregularities or tolerance errors in the splines of the piston sleeve and can accommodate bending in the outer cylindrical body or the rotary output shaft due to heavy bending loads on the actuator. Another feature of the invention is a combined linear and helically splined rotary actuator which can provide both rotary and linear movement relative to an output shaft and an outer boom tube; and in the preferred embodiment of this feature of the invention, the ring gear for the helically splined rotary actuator is a separate, independently mounted ring gear with a flush mounting on the other surface of the outer cylindrical rotary actuator body so that the body can pass through the end seals of the outer boom tube.

대표청구항 ▼

A fluid-powered, helically splined rotary actuator comprising an outer cylindrical body, an output shaft, and linear-to-rotary transmission means between the body and the output shaft for providing relative rotational movement in opposite directions between the body and the output shaft, said transm

A fluid-powered, helically splined rotary actuator comprising an outer cylindrical body, an output shaft, and linear-to-rotary transmission means between the body and the output shaft for providing relative rotational movement in opposite directions between the body and the output shaft, said transmission means including an encircling, one-piece, circular, splined ring gear separate from and independently joined to said body, said body including an elongated, one-piece continuous cylinder having a sidewall and having ring gear fastening openings within the sidewall, ports in said body for introducing pressuriTd fluid into the cylinder, means for said fastening openings for joining the ring gear to said sidewall and sealing the fastening openings against leakage of pressurized fluid out of said cylinder, and wherein said joining means transmits torque between the ring gear and the cylinder and axially locates the ring gear within the cylinder, said body having a smooth outer surface, said ring gear joining means including fasteners mounted flush with said body outer surface, an outer tube encircling said body, said outer tube having at least one set of end seals, and wherein said outer cylindrical body and flush ring gear fasteners provide a continuous smooth surface movable past said end seals without interference therewith.