Metal working – Method of mechanical manufacture – Impeller making
Reexamination Certificate
2002-03-26
2004-07-20
Nguyen, Ninh H. (Department: 3745)
Metal working
Method of mechanical manufacture
Impeller making
C415S163000, C415S164000, C415S204000
Reexamination Certificate
active
06763587
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to a manufacturing method of the component part for a variable capacity turbine which is used in the supercharger (the exhaust gas turbocharger) of internal combustion engines or the so forth, and the structure of the component part. The variable capacity turbine is configured in such a way that the actuating gas flows from a spiral scroll formed in the turbine casing to the turbine rotor in a radial direction through multiple nozzle vanes provided with wings of a variable angle for rotating the turbine rotor. This invention relates specially to a manufacturing method of a nozzle driving member for the adjustable nozzle mechanism and a connecting member to connect the nozzle driving member and the nozzle vanes, and the structure of the component part.
2. Description of the Related Art
In order to make a good match with regard to the internal combustion engine, between the outflow exhaust gas volume from the engine and the actuating gas flow volume, which should be determined for the optimum operation condition of the supercharger, variable capacity superchargers, equipped with a variable capacity turbine capable of changing the exhaust gas volume to be sent from the spiral scroll to the turbine rotor in accordance with the operation condition of the engine, have been in widespread use in recent years.
An example of the conventional adjustable nozzle mechanism used in such variable capacity turbine is shown in FIG.
7
and FIG.
8
.
FIG. 7
illustrates the essential cross sectional view (C—C cross section shown in
FIG. 8
) highlighting the connecting portion of the link assembly and the lever plate, and
FIG. 8
illustrates D-arrowed view in FIG.
7
.
In FIG.
7
and
FIG. 8
, the link assembly
10
in the adjustable nozzle mechanism is configured by a circular shaped link plate
3
into which connecting pins
03
a
, which are manufactured separately from the link plate
3
, are fixed in a circumferential direction by press—insert or by welding, etc. In the adjustable nozzle mechanism, one end of lever plate
1
is fixed to each nozzle shaft
02
of the nozzle vane, and as shown in
FIG. 7
, the other end of lever plate
1
is provided with a recess
1
c
which engages with a connecting pin
03
a
of link assembly
10
with a small enough gap to maintain the normal function of the nozzle vanes (not shown in the figure).
In the prior art mentioned above, however, since the connecting pins
03
a
, connecting the circular-shaped link plate
3
and lever plates
1
provided in a circumferential direction, are manufactured separately from link plate
3
, fixed by press-insert or by welding, etc., it is necessary to fix a number of connecting pins
03
a
along the circumferential direction of link plate
3
in the above mentioned way. This requires a separate process count for manufacturing the connecting pins
03
a
, and it also requires the assembling process to assemble the connecting pins
03
a
into the link plate
3
. As a result, these processes drive the link assembling count and manufacturing costs higher.
An addition problem is, since link plate
3
and the connecting pins
03
a
are manufactured separately, the number of component parts will be increased and the total weight of link assembly
10
will also be increased. Thus the prior arts have the above mentioned problems.
SUMMARY OF THE INVENTION
In consideration of the problems with the conventional arts mentioned above, the object of this invention is to propose a manufacturing method for manufacturing a component part for the variable capacity turbine, and the structure of the nozzle driving member, which will simplify the structure of the component part for the adjustable nozzle mechanism, the manufacturing work which results in lowering the manufacturing count and cost, as well as the number of component part, and in lightening the weight of the variable capacity turbine.
The invention is applied to solve these problems, and the variable capacity turbine for applying this invention is a radial-flow variable capacity turbine. It is configured in such a way that the actuating gas is forced to flow from a spiral scroll formed in the turbine casing to the turbine rotor in a radial direction, through multiple nozzle vanes of which the angle is adjustable by the adjustable nozzle mechanism, for rotating the turbine rotor. The manufacturing method for the component part for the variable capacity turbine according to this invention is distinguished by the configuration in which, for manufacturing a connecting pin which transmits the driving force to the engaging counter member by engaging with a recess or a hole formed in the counter member out of the component parts of the adjustable nozzle mechanism, and a plate member connected to the connecting pin, the manufacturing method includes a step of forming the connecting pin as a single structure with the plate member by partially forcing a surface of the plate member to protrude in a column shape.
In this invention, when the connecting pin and the plate member are formed as a single structure, the connecting pin can be formed preferably by a pressing, in which one side surface of the plate member is pressed towards the opposite side surface by a male molder to depress and form a depressed portion, then a protrusion formed on the opposite side surface of the depressed portion is accepted into the molding cap of the female molder in order to form the connecting pin having a column shape.
As an alternative, the connecting pin can be formed preferably by precision molding as a single structure with the plate member.
Further, this invention is applied to the variable capacity turbine which is configured in the following way. The actuating gas is forced to flow from a spiral scroll formed in the turbine casing in a radial direction to the turbine rotor, through multiple nozzle vanes of which the angle is adjustable by the adjustable nozzle mechanism, for rotating the turbine rotor. The adjustable nozzle mechanism is provided on the nozzle mount fixed to the turbine casing in such a way that the mechanism is free to rotate, and is provided along the circumferential direction of the turbine. The circular shaped nozzle driving member provided around the turbine shaft in such a way that it is free to rotate by an actuator, drives the nozzle vanes. One end of a connecting member is fixed to the nozzle vane shaft of each nozzle vane, the other end of the connecting member is engaged with a recess or a hole through a connecting pin to engage with the nozzle driving member. The same number of connecting members are provided as the number of nozzle vanes. In the manufacturing method to manufacture such component part in the variable capacity turbine, the method is distinguished by comprising the steps of: forming either the nozzle driving member or the connecting member with a plate member, and forming the connecting pin as a single structure with the plate member by partially forcing a surface of the plate member to protrude in a column shape by pressing or by precision molding.
Furthermore, this invention is applied to the variable capacity turbine which is configured in the following way. The actuating gas is forced to flow from a spiral scroll formed in the turbine casing in a radial direction to the turbine rotor, through multiple nozzle vanes of which the angle is adjustable by the adjustable nozzle mechanism, for rotating the turbine rotor. The multiple nozzle vanes are provided on the nozzle mount fixed to the turbine casing in such a way that they are free to rotate, and are provided along the circumferential direction of the turbine. The circular shaped nozzle driving member provided around the turbine shaft in such a way that it is free to rotate by an actuator, drives the nozzle vanes. One end of a connecting member is fixed to the nozzle vane shaft of each nozzle vane, the other end of the connecting member is engaged with a recess or a hole through the connecting pin to engage with the nozzle driving m
Jinnai Yasuaki
Matsumoto Koji
Sakamoto Taro
Mitsubishi Heavy Industries Ltd.
Nguyen Ninh H.
Wenderoth , Lind & Ponack, L.L.P.
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