STRUCTURE AND METHOD FOR JOINING NOZZLE VANE AND LEVER, AND VARIABLE GEOMETRY TURBOCHARGER
First Claim
1. A joint structure of a nozzle vane and a lever, comprising:
- a nozzle vane to be disposed in an exhaust passage for guiding exhaust gas to a turbine wheel of a variable geometry turbocharger, the nozzle vane including a shaft portion; and
a lever including a fitting surface to be fitted with a peripheral surface on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane,wherein the lever and the one end side of the shaft portion are joined to each other by welding, andwherein weld metal at a welded part between the lever and the one end side of the shaft portion is formed so that a center position of the weld metal is disposed inside a position of the fitting surface with respect to a radial direction of the shaft portion.
2 Assignments
0 Petitions
Accused Products
Abstract
An object is to provide a structure and a method of joining a nozzle vane and a lever, and a variable geometry turbocharger, capable of reducing breakage of a welded part between a shaft portion of the nozzle vane and the lever during usage of the same by reducing generation of a hot crack in weld metal at the welded part. A joint structure includes: a nozzle vane 2 disposed in an exhaust passage for guiding exhaust gas to a turbine wheel 34 of a variable geometry turbocharger 500, and including a shaft portion 2a; and a lever 1 including a fitting surface 42a fitted with a peripheral surface 72 on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane. Weld metal 50 at a welded part 40 between the lever and the nozzle vane is formed so that a center position 64 of the weld metal is disposed inside a position 17 of the fitting surface with respect to a radial direction of the shaft portion.
4 Citations
10 Claims
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1. A joint structure of a nozzle vane and a lever, comprising:
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a nozzle vane to be disposed in an exhaust passage for guiding exhaust gas to a turbine wheel of a variable geometry turbocharger, the nozzle vane including a shaft portion; and a lever including a fitting surface to be fitted with a peripheral surface on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane, wherein the lever and the one end side of the shaft portion are joined to each other by welding, and wherein weld metal at a welded part between the lever and the one end side of the shaft portion is formed so that a center position of the weld metal is disposed inside a position of the fitting surface with respect to a radial direction of the shaft portion. - View Dependent Claims (2, 3, 4, 5)
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6. A joint structure of a nozzle vane and a lever, comprising:
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a nozzle vane to be disposed in an exhaust passage for guiding exhaust gas to a turbine wheel of a variable geometry turbocharger, the nozzle vane including a shaft portion; and a lever including a fitting surface to be fitted with a peripheral surface on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane, wherein the nozzle vane is composed of nickel-based alloy, wherein the lever is composed of stainless steel, and wherein the lever and the one end side of the shaft portion are welded to each other, and a radiation-center position radiated by heat for welding is disposed outside a position of the fitting surface with respect to a radial direction of the shaft portion. - View Dependent Claims (7, 8)
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9. A method of joining a nozzle vane and a lever by welding, comprising:
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providing a nozzle vane to be disposed in an exhaust passage for guiding exhaust gas to a turbine wheel of a variable geometry turbocharger, the nozzle vane including a shaft portion and being composed of nickel-based alloy, and a lever including a fitting surface to be fitted with a peripheral surface on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane, the lever being composed of stainless steel; and welding the lever and the one end side of the shaft portion by radiating heat to the lever and the one end side of the shaft portion so that a radiation-center position is disposed outside a position of the fitting surface with respect to a radial direction of the shaft portion. - View Dependent Claims (10)
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Specification