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Rotary helical actuator

  • US 4,422,366 A
  • Filed: 10/16/1981
  • Issued: 12/27/1983
  • Est. Priority Date: 10/16/1981
  • Status: Expired due to Term
First Claim
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1. A rotary actuator comprising a cylinder, a shaft rotatably mounted within said cylinder for relative rotation between the shaft and the cylinder, linear-to-rotary motion conversion means between the shaft and cylinder, said motion conversion means including a piston, means for selectively introducing pressurized fluid to alternative sides of said piston for reciprocating the piston and producing said relative rotation, and bearing means for carrying the radial and bending loads between the shaft and cylinder, said bearing means including a cylindrical bearing sleeve joined to said shaft extending along the length of the shaft inward of said cylinder, and spaced radially from the outer surface of the shaft to define an operating chamber for receiving the motion conversion means, and said bearing sleeve having a radially outer bearing surface in engagement with the inner surface of the cylinder.

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