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Sliding gear for speed-changing transmission

  • US 4,619,150 A
  • Filed: 08/19/1985
  • Issued: 10/28/1986
  • Est. Priority Date: 04/02/1980
  • Status: Expired due to Fees
First Claim
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1. In a speed-changing transmission including a driving gear, an output shaft arranged for rotation in a first sense under the action of said driving gear, a sliding gear freely rotatably and axially displaceably mounted on said output shaft and having a set of peripheral running teeth which extend substantially radially outwardly of said sliding gear and are in permanent mesh with said driving gear, said sliding gear being further provided with a set of peripheral first clutch teeth and a coupling member fixedly mounted on said output shaft and having a set of peripheral second clutch teeth adapted to be in meshing engagement with said first clutch teeth upon an axial shift of said sliding gear along said output shaft into an engagement position in which said output shaft is rotated by said driving gear in a second sense opposite to said first sense through the intermediary of said sliding gear and said coupling member;

  • the improvement comprising said first clutch teeth extend between a pair of axially spaced annular surfaces formed on a sleeve constituting part of said sliding gear and into which said coupling member fits and said first clutch teeth project substantially radially inwardly of said sliding gear, said second clutch teeth extend between a pair of axially spaced faces of a disk forming said coupling member and project substantially radially outwardly of said coupling member, said first clutch teeth being formed within said sleeve, and said running teeth and said first clutch teeth have respective centerlines including with the axial direction of said sliding gear respective acute angles of inclination β

    L and β

    K substantially satisfying the expression
    
    
    space="preserve" listing-type="equation">β

    .sub.K =arctan (r.sub.K /r.sub.L tan β

    .sub.L)where rK and rL are the effective radii of said first clutch teeth and said running teeth, respectively, and said acute angles of inclination are of the same sign, whereby axial forces exerted under load upon said running teeth and upon said first clutch teeth in said engagement position of said sliding gear substantially cancel each other under both "push" and "pull" operating conditions in both senses of rotation of said output shaft, each of said first clutch teeth further having its flanks diverging by back angles ρ

    <

    β

    K of opposite signs from the center line of that first clutch tooth in the direction of said axial shift of said sliding gear into said engagement position of the latter, thereby to maintain said first clutch teeth securely engaged with said second clutch teeth, said flanks including with the centerlines of said clutch teeth back angles of opposite signs ranging between 1.5° and



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