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Nozzle adjustment mechanism for variable-capacity turbine

  • US 6,699,010 B2
  • Filed: 05/14/2001
  • Issued: 03/02/2004
  • Est. Priority Date: 05/19/2000
  • Status: Expired due to Term
First Claim
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1. A variable-capacity turbine comprising:

  • a coil-shaped scroll in a turbine casing;

    a plurality of nozzle vanes circumferentially arranged along an inner peripheral side of said scroll, said vanes being rotatably supported by said turbine casing so as to be capable of varying an angle of said vanes, and each of said vanes having a respective nozzle shaft;

    a turbine rotor disposed inside of said vanes and being rotatable when operating gases flow from said scroll through said vanes to said turbine rotor; and

    a nozzle adjustment mechanism comprising;

    a nozzle drive member connected to an actuator, said actuator being capable of rotating said drive member about a turbine axis, and a plurality of connecting levers connecting said nozzle drive member to said vanes, wherein each of said connecting levers has a respective connecting hole with a stopper surface that is at least partly non-circular in shape, each said nozzle shaft has a connecting edge having a stopper surface with an at least partly non-circular shape corresponding to said stopper surface of said connecting hole, said stopper surface of each said connecting edge contacting a stopper surface of a respective said connecting hole so as to be connected and locked together without deformation of said stopper surface of said connecting hole or said stopper surface of said connecting edge and such that said stopper surface of said connecting hole and said stopper surface of said connecting edge cannot rotate relative to each other, wherein said connecting edge is fixed with respect to said connecting hole, wherein said stopper surface of said connecting hole and said stopper surface of said connecting edge are each shaped to have two flat parallel surfaces, said two flat parallel surfaces of said stopper surface of said connecting hole contacting said two flat parallel surfaces of said stopper surface of said connecting edge, and wherein said connecting edge is fixed with respect to said connecting hole by a rivet or weld of only an end of said connecting edge such that a remaining portion of said connecting edge of said nozzle shaft other than said end remains intact without deformation of said stopper surface of said connecting hole or said stopper surface of said connecting edge.

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