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Rotary damper

  • US 4,908,905 A
  • Filed: 12/13/1988
  • Issued: 03/20/1990
  • Est. Priority Date: 01/12/1988
  • Status: Expired due to Fees
First Claim
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1. A rotary damper, comprising:

  • a sealed housing having a viscous fluid disposed therein;

    a shaft, having a non-circular configuration, rotatably supported within said housing and adapted to be rotatably driven by means of torque applied thereto;

    a plurality of rotors, mounted upon said shaft, having a predetermined axial thickness as determined by means of forward and rearward radially extending surfaces, and hub portions extending axially beyond said forward and rearward surfaces so as to define hub regions of said rotors which have axial extents greater than said predetermined axial thickness of said rotors;

    a plurality of spacers mounted upon said shaft in alternative positions with respect to said plurality of rotors mounted upon said shaft and engaged with said hub regions of said rotors so as to define gap spaces between said rotors and said spacers;

    first air-purging hole means defined within each one of said plurality of rotors and fluidically communicating with said gap spaces;

    axial bore means defined within each one of said rotors which has a configuration corresponding to said non-circular configuration of said shaft such that said rotors are rotated in unison along with said shaft under torque application conditions while said first air-purging hole means are axially aligned with respect to each other;

    second air-purging hole means defined within each one of said plurality of spacers and fluidically communicating with said gap spaces;

    axial bore means defined within each one of said spacers which is sufficiently large so as to permit said shaft to rotate with respect to said spacers;

    projection means integrally defined upon said spacers; and

    groove means integrally defined within said housing for receiving said projection means of said spacers for preventing rotation of said spacers relative to said housing and for maintaining axial alignment of said second air-purging hole means of said spacers with respect to each other.

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