Variable displacement exhaust turbocharger equipped with variable nozzle mechanism
First Claim
1. A variable displacement exhaust turbocharger which is equipped with a variable nozzle mechanism and is driven by exhaust gas from an engine, the variable displacement exhaust turbocharger comprising:
- a plurality of nozzle vanes supported rotatably by a nozzle mount which is fixed to a case including a turbine casing of the variable displacement exhaust turbocharger;
a drive ring which is interlocked with an actuator and is fitted to an annular guide part protruding from a center part of the nozzle mount in an axial direction;
a plurality of lever plates each of which is fitted to a groove formed in the drive ring at one end via a connection pin and is connected to the nozzle vane at the other end;
the variable nozzle mechanism configured to swing the plurality of lever plates by rotation of the drive ring so as to change a vane angle of the plurality of nozzle vanes;
a press-fitting pin which is press-fit to a side of the nozzle mount at a position closer to a rotation axis than the annular guide part, anda relief provided in a section of connection between a protruding portion on a side face of the nozzle mount and the annular guide part,wherein a bulge suppressing portion is provided in at least one of the press-fitting pin or a press-fitting hole formed in the axial direction of the nozzle mount so as to absorb and suppress a bulge of an outer peripheral surface of the annular guide part generated when the press-fitting pin is press-fit in the press-fitting hole, andwherein the press-fitting pin includes a flange for retaining an inner peripheral part of the drive ring to prevent inner peripheral part of the drive ring from coming off from the annular guide part, a radial direction in which the flange extends to another peripheral part of an end surface of the annular guide part is a thrust direction so as to secure a clearance.
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Accused Products
Abstract
A variable displacement exhaust turbocharger is provided with a plurality of nozzle vanes that are rotatably supported by a nozzle mount, a drive ring that is interlocked with an actuator and fits to a guide part of the nozzle mount, a lever plate having one end coupled to the drive ring and the other end coupled to the nozzle vane, and a variable nozzle mechanism that varies the vane angle of the nozzle vane by rotating the drive ring. A bulge suppressing portion is provided for absorbing bulging occurring on an outer peripheral surface of the guide part, the bulging being caused by the press-fitting of a nail pin into a press-fitting hole in a direction slightly toward the rotational axis with respect to the guide section and following the axial direction of the nozzle mount.
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Citations
9 Claims
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1. A variable displacement exhaust turbocharger which is equipped with a variable nozzle mechanism and is driven by exhaust gas from an engine, the variable displacement exhaust turbocharger comprising:
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a plurality of nozzle vanes supported rotatably by a nozzle mount which is fixed to a case including a turbine casing of the variable displacement exhaust turbocharger; a drive ring which is interlocked with an actuator and is fitted to an annular guide part protruding from a center part of the nozzle mount in an axial direction; a plurality of lever plates each of which is fitted to a groove formed in the drive ring at one end via a connection pin and is connected to the nozzle vane at the other end; the variable nozzle mechanism configured to swing the plurality of lever plates by rotation of the drive ring so as to change a vane angle of the plurality of nozzle vanes; a press-fitting pin which is press-fit to a side of the nozzle mount at a position closer to a rotation axis than the annular guide part, and a relief provided in a section of connection between a protruding portion on a side face of the nozzle mount and the annular guide part, wherein a bulge suppressing portion is provided in at least one of the press-fitting pin or a press-fitting hole formed in the axial direction of the nozzle mount so as to absorb and suppress a bulge of an outer peripheral surface of the annular guide part generated when the press-fitting pin is press-fit in the press-fitting hole, and wherein the press-fitting pin includes a flange for retaining an inner peripheral part of the drive ring to prevent inner peripheral part of the drive ring from coming off from the annular guide part, a radial direction in which the flange extends to another peripheral part of an end surface of the annular guide part is a thrust direction so as to secure a clearance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification