초록 ▼

A method and apparatus wherein a travel limit/dampening device is coupled to the end of a screw of a linear ball screw actuator device for limiting the travel of an actuator extension coupled to a nut supported for linear driven displacement in either direction along the screw. The travel limit/damp

A method and apparatus wherein a travel limit/dampening device is coupled to the end of a screw of a linear ball screw actuator device for limiting the travel of an actuator extension coupled to a nut supported for linear driven displacement in either direction along the screw. The travel limit/dampening device includes a gas shock supported within a double acting reaction device reactive axially between the nut and screw when the extension is fully retracted and extended, respectively, to collapse the shock absorber and thereby dampen the movement of the extension at each end of its stroke.

대표청구항 ▼

[ I claim:] [1.] In a linear ball screw actuator assembly having a rotatable axially extending drive screw with exterior helical ball accommodating grooves and an axially inner and outer end, a nut arranged about said screw to cooperate with said screw to provide a raceway, at least one circuit of l

[ I claim:] [1.] In a linear ball screw actuator assembly having a rotatable axially extending drive screw with exterior helical ball accommodating grooves and an axially inner and outer end, a nut arranged about said screw to cooperate with said screw to provide a raceway, at least one circuit of load bearing balls recirculating in said raceway between said screw and said nut to convert rotary motion of said screw to linear displacement of said nut in each axial direction along said screw, and an extension device arranged coaxially about said screw having an axially outward generally radial end part extending beyond said outer end of said screw and fitted with a connector for attachment to a mechanism to be actuated, said extension device having an inward end coupled to said nut for linear axial movement therewith relative to said screw between a fully extended stroke position and a fully retracted stroke position, wherein the improvement comprises:a shock absorbing device, comprising a sealed gas absorber cylinder with a relatively collapsible plunger, relatively axially slideably received in an axially non-collapsible carrier device having an axial lost motion connection with said outer end of said screw mounted on said screw and operative to relatively collapse said plunger and cylinder and absorb energy as said extension device approaches both said fully extended and fully retracted positions in order to cushion the sudden stoppage of said extension device at each end of its stroke.