Variable displacement exhaust turbocharger equipped with variable nozzle mechanism
It is intended to achieve weight reduction and production reduction of a nozzle mount for pivotably supporting a drive ring constituting a variable nozzle mechanism, and is characterized by: providing on an end face of a guide part 5 a a nail pin 20 having a flange portion and being positioned so as to hold a drive ring 3 of a variable nozzle mechanism 100 to the guide part 5 a of a nozzle mount 5 in the thrust direction, and setting the thrust-directional width of the drive ring 3 smaller than the width of the guide part 5 a , and providing an adjusting member 20 c between the flange portion of the nail pin 20 and the end face of the guide part 5 a to adjust a distance between the side face of the nozzle mount and the flange portion of the nail pin 20.
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 outer peripheral surface of 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 another end;
a press-fitting pin which has a flange portion facing one side face of the drive ring, the press-fitting pin being press-fitted into a press-fitting hole formed in one end face of the guide part along a thrust direction of the guide part so as to retain the drive ring in the thrust direction,
the guide part being configured to support an inner peripheral surface of the drive ring and having a width in a thrust direction which is smaller than a width of the drive ring; and
a spacer member arranged between the flange portion of the press-fitting pin and the one end face of the guide part,
wherein the spacer member is formed so as not to project beyond the outer peripheral surface of the guide part in a radial direction when the press-fitting pin is press-fitted, and
wherein a thrust-directional thickness of the spacer member is formed so that a clearance is maintained between the flange portion of the press-fitting pin and one side face of the nozzle mount to prevent a fixation of the nozzle mount and a sliding portion of the driving ring, the drive ring being sandwiched between the flange portion and the side face of the nozzle mount.
2. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 1 ,
wherein the press-fitting pin includes the spacer member, and
wherein the spacer member is formed integrally with the flange portion of the press-fitting pin.
3. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 1 ,
wherein the spacer member has an annular shape and is formed by a separate member from the press-fitting pin.