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Linear actuator

  • US 4,050,319 A
  • Filed: 01/16/1976
  • Issued: 09/27/1977
  • Est. Priority Date: 01/16/1976
  • Status: Expired due to Term
First Claim
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1. In a linear actuator including a threaded shaft member, a bearing unit mounting member having a portion of same disposed in substantial concentric relation to the shaft member, a bearing unit operatively interposed between said mounting member and said shaft member for moving one of said members linearly and axially of said shaft member when the other member is rotated about the longitudinal axis of the shaft member, and means for rotating said other member about said axis of said shaft member, with said bearing unit comprising a plurality of discrete rollers each defining a force transmitting surfacing about each end of same and a plurality of thrust transmitting faces intermediate said bearing surfacings of the respective rollers that are angled relative to the longitudinal axis of the respective rollers and that are in rolling substantially complementing engagement with the shaft member threading, and an outer race structure defining spaced apart raceway surfacings about the shaft member axis about which said roller bearing surfacings ride, with said roller faces being free of engagement with said outer race structure and the mounting member and said rollers being in free rolling nonjournalled relation to said outer race structure, the improvement wherein:

  • said roller bearing surfacings each define at the respective ends of said rollers;

    a radial load transmitting bearing surface and a thrust transmitting bearing surface intermediate said radial load transmitting surface and said faces at the respective ends of the respective rollers,said outer race structure raceway surfacings each defining a radial load transmitting surface on which the respective roller radial load transmitting bearing surfaces respectively ride and a thrust transmitting surface on which the respective roller thrust transmitting bearing surfaces respectively ride in substantial complemental relation thereto,said roller thrust transmitting bearing surfaces at either end of the respective rollers being substantially equally angled relative to the longitudinal axis of the respective rollers and at an angulation up to ninety degrees that exceeds said roller thrust transmitting face angulation.

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