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A non-jamming rotary mechanical actuator for aircraft control surfaces includes a pair of fixed ring gears separated by a moving ring gear. An end plate having a central bore therethrough and a bearing member for rotatably supporting a shaft is mounted at each outer side of said pair of fixed ring g

A non-jamming rotary mechanical actuator for aircraft control surfaces includes a pair of fixed ring gears separated by a moving ring gear. An end plate having a central bore therethrough and a bearing member for rotatably supporting a shaft is mounted at each outer side of said pair of fixed ring gears. Each ring gear has an internal gear surface. The shaft includes an integral inner cam member having a first offset and an outer cam member having a second offset. In driving relationship with said outer cam member is a compound gear having three sets of gear teeth for intermittent contact with said internal gear surfaces of the three ring gears. When a shear member located between the two cam members is broken due to torque overload, the cam members rotate relative to each other so that the compound gear loses contact with the ring gears, thus preventing jamming.

대표청구항 ▼

An actuator comprising: at least one moving ring gear having an internal gear surface; a fixed ring gear on each side of said at least one moving ring gear, each fixed ring gear having an internal gear surface defining a ring gear bore; a shaft extending through said ring gears including a first cam

An actuator comprising: at least one moving ring gear having an internal gear surface; a fixed ring gear on each side of said at least one moving ring gear, each fixed ring gear having an internal gear surface defining a ring gear bore; a shaft extending through said ring gears including a first cam member rotatable with and secured thereon, the axis of said first cam member being offset from the axis of said shaft by a first amount of offset; means for retaining said ring gears in a desired relationship which means are rotatable with said shaft; bearing means, mounted within said means for retaining, for rotatably supporting said shaft; a generally cylindrical second cam member having a bore therethrough, the axis of said bore is offset from the axis of said second cam member by a second amount of offset, said first cam member disposed within said bore of said second cam member and having said first amount of offset thereof being approximately equal to said second amount of offset; shear means for transmitting torque from said first cam member to said second cam member below a desired torque level; a needle bearing located around said second cam member; and a compound gear secured over said needle bearing, said compound gear having a number of gear tooth surfaces thereon, said number of gear tooth surfaces being equal to the total number of fixed and moving gear rings and in driving relationship therewith below said desired torque level of said shear means.