JP2003254075A - Nozzle drive mechanism of variable capacity type supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle drive mechanism of a variable capacity type supercharger reducing the number of part items while at the same time reducing its weight and man hours for its manufacture and assembly. <P>SOLUTION: In the variable capacity type supercharger 1, a plurality of circumferentially arranged nozzle vanes 12 forming a vane nozzle are rotatably supported via support shafts 12a. Each of the support shafts 12a is securely connected to a connecting hole 33b at one end of a nozzle link plate 33 and a drive pin part 33a is formed integrally with the other end. A circumferentially oscillating annular drive ring 31 is provided on the same axis as an annular gas flow passage 10 and the drive pin part 33a is connected to a drive pin connection 32 formed on the outer periphery of the drive ring 31 to operate the nozzle vane 12 in conjunction with the drive pin part to drive it for opening and closing. Thus, the number of part items is reduced while the weight of the mechanism is reduced to reduce the man hours for its manufacture and assembly. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle drive mechanism for a variable displacement supercharger, which is designed to reduce the number of parts and the weight of a mechanism for driving opening and closing by interlocking a plurality of nozzle vanes of a vane nozzle. Is.

[0002]

2. Description of the Related Art While the problems of automobile exhaust gas and environment are being highlighted worldwide, in the passenger car class small diesel engine market, turbochargers are being used to meet emission regulations, reduce fuel consumption, and improve performance. It is becoming essential to use the variable capacity supercharger, which can improve the performance in a wide range from low speed to high speed.
One of such variable capacity superchargers is a multi-vane nozzle type variable capacity supercharger, which is configured as shown in FIG. 3, for example.

In this variable displacement supercharger 1, a bearing housing 4 is arranged between a turbine housing 2 and a compressor housing 3 and connected integrally, and a turbine impeller 5 in the turbine housing 2 and a compressor housing 3 are provided. A compressor impeller 6 therein is integrally connected via a turbine shaft 7 rotatably supported in the bearing housing 4. The turbine housing 2 is provided with a scroll passage 9 having a gas inlet 8 at one end, and an annular gas passage 10 is provided in an inner peripheral portion of the scroll passage 9 to introduce gas into the turbine impeller 5, The gas after driving the turbine impeller 5 is discharged from a gas outlet 11 formed in the center.

A vane nozzle and a nozzle driving mechanism for driving the vane nozzle are unitarily provided in the turbine housing 2 so as to be detachable, and a plurality of vane nozzles are formed in the annular gas passage 10 of the turbine housing 2. Nozzle vanes 12 are rotatably provided and can be opened / closed by adjusting and controlling the angle of the nozzle vanes 12 from the outside by a nozzle drive mechanism 13 such as a slide joint system to change the flow rate of gas introduced into the turbine impeller 5. It is made possible (see Fig. 3
In (a), the nozzle vanes 12 on the upper side of the paper surface are shown in a fully opened state, and the nozzle vane 12 on the lower side of the paper surface is shown in a fully closed state).

In such a variable displacement supercharger 1, since the nozzle side clearance δ has a great influence on the performance, the optimum gap is determined from the operation of the nozzle, the performance and reliability, and the nozzle vane 12 of the vane nozzle is determined. The clearance control plate 14 is mounted on the side surface of the turbine housing 2 to be attached to the turbine housing 2 so as to secure the clearance δ at the time of hot and suppress the performance deterioration due to the exhaust gas flowing out without passing through the nozzle. In addition,
In the figure, 15 is a stopper pin for restricting the maximum opened position of the nozzle vane 12.

As shown in FIGS. 3 and 4, the nozzle drive mechanism 13 of the vane nozzle of the variable displacement supercharger 1 has a support shaft 1 for rotatably supporting the nozzle vane 12.
2a is connected and fixed to the base end portion of a fork-shaped nozzle link plate 16, while an annular drive ring 17 is provided coaxially with the annular gas flow path 10 so as to be swingable in the circumferential direction. Drive pin 18 corresponding to nozzle vane 12
The drive pin 18 is attached with a slide joint 19 up to a quadrangular saw, and the fork portion of the nozzle link plate 16 is connected so as to sandwich the slide joint 19.

As a result, by swinging the drive ring 17 in the circumferential direction, the drive pin 18 and the slide joint 1
By swinging the nozzle link plate 16 via 9, the driving force is transmitted to the nozzle vanes 12 so that each nozzle vane 12 can be opened and closed in conjunction with each other.

Therefore, according to such a variable capacity supercharger 1, the nozzle drive mechanism 13 rotates the nozzle vanes 12 to throttle the vane nozzles when the gas flow rate at a low engine speed is small. When the gas flow rate at a high speed of the engine is large, the nozzle vane 12 is rotated to be opened, and the vane nozzle is opened as the maximum position until the vane nozzle hits the stopper pin 15.
It is possible to improve engine performance by supercharging a wide range from low speed rotation to high speed rotation.

[0009]

However, in the nozzle drive mechanism 13 of such a variable displacement type supercharger 1, the drive pin 18 is caulked and attached to the drive ring 17, and the slide joint 19 is attached to the drive pin 18. Since it is connected to the fork portion of the nozzle link plate 16,
There is a problem that the number of parts is large and the number of manufacturing and assembling steps is increased.

Therefore, instead of the drive pin 18 and the slide joint 19, the columnar portion of the end portion of the drive pin 18 is positioned and connected to the fork portion of the nozzle link plate 16, and the slide joint may be omitted. However, although the number of parts is reduced by one, there is a problem in that the number of manufacturing and assembling steps cannot be reduced, such as the crimping of the drive pin to the drive ring.

On the other hand, in order to reduce the number of parts and the number of manufacturing / assembling steps, as shown in FIG.
It is conceivable that the drive pin 18 is integrally formed by fine blanking processing, but the amount of protrusion of the drive pin 18 portion is about 60 to 70% of the thickness of the drive ring 17 which is the base material. In order to secure the amount of protrusion of the pin 18 portion, a thick drive ring 17 is required, which causes a problem of an increase in weight.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to reduce the weight as well as the number of parts, and to reduce the manufacturing and assembling man-hours. It is intended to provide a nozzle driving mechanism of a feeder.

[0013]

In order to solve the problems of the above-mentioned prior art, the nozzle drive mechanism of the variable displacement supercharger according to claim 1 of the present invention is an annular gas passage on the gas inlet side of a turbine. A variable capacity supercharger having a vane nozzle for varying a gas flow rate, wherein a plurality of circumferentially arranged nozzle vanes forming the vane nozzle are rotatably supported via a supporting shaft, and One end of the nozzle link plate is connected and fixed to the support shaft of the nozzle vane, and a drive pin part is integrally formed at the other end of the nozzle link plate, and swings in the circumferential direction coaxially with the annular gas passage. An annular drive ring is provided, and the drive pin connecting portion formed on the outer peripheral portion of the drive ring is connected to the drive pin portion of the nozzle link plate to interlock with the nozzle vane to open and close. Is shall.

According to this nozzle drive mechanism of the variable capacity supercharger, the variable capacity supercharger is provided with the vane nozzle for varying the gas flow rate in the annular gas flow path on the gas inlet side of the turbine. A plurality of nozzle vanes arranged in the circumferential direction are rotatably supported via a support shaft,
One end of the nozzle link plate is connected and fixed to the support shaft of each nozzle vane, and a drive pin portion is integrally formed at the other end of the nozzle link plate, and the drive shaft is formed coaxially with the annular gas flow path in the circumferential direction. Providing an oscillating annular drive ring,
The drive pin connecting portion formed on the outer peripheral portion of the drive ring is connected to the drive pin portion of the nozzle link plate so that the nozzle vanes are interlocked to drive the opening and closing, and the drive pin connecting portion is formed on the drive ring. By connecting the drive pin portion integrally formed with the nozzle link plate to the nozzle vane, the nozzle vane can be opened and closed to reduce the number of parts, reduce the weight, and reduce the number of manufacturing and assembling steps.

According to a second aspect of the present invention, in the nozzle drive mechanism of the variable displacement supercharger, in addition to the configuration of the first aspect, the drive pin portion of the nozzle link plate is integrated by precision press working. It is characterized by being formed.

According to the nozzle drive mechanism of this variable displacement supercharger, the drive pin portion of the nozzle link plate is integrally formed by precision press working, and the total number of nozzle links is smaller than that of the drive ring. By integrally forming the drive pin part on the plate by precision press working, the total weight can be suppressed, the number of parts can be reduced, the weight can be further reduced, and the number of manufacturing and assembling steps can be reduced.

According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the nozzle drive mechanism of the variable displacement supercharger has the drive pin connecting portion of the drive ring opened on the outer peripheral side. It is characterized in that it is configured by a groove.

According to this nozzle drive mechanism of the variable displacement supercharger, the drive pin connecting portion of the drive ring is formed by a groove having an outer peripheral side opening, and the weight is reduced as a U-shaped groove. It also facilitates processing, reduces the number of parts, and at the same time, reduces the weight and further reduces the manufacturing and assembly man-hours.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 relate to an embodiment of a nozzle drive mechanism of a variable displacement supercharger of the present invention. FIG. 1 is a partial side view and a partial perspective view showing an exploded view, and FIG. 2 is a partial sectional view. .

Nozzle drive mechanism 3 of this variable displacement supercharger
The basic structure of the variable capacity supercharger to which 0 is applied is the same as that of the variable capacity supercharger 1 of the multi-vane nozzle system described above with reference to FIG. As shown in FIG. 2, the turbine housing 2 is provided with a scroll passage 9 having a gas inlet formed at one end thereof, and is provided at an inner peripheral portion of the scroll passage 9 as shown in FIG. A plurality of nozzle vanes 12 constituting vane nozzles are rotatably provided in the annular gas flow passage 10 by a support shaft 12a, and the annular gas flow passage 10 is also configured as a unit of the nozzle vane 12 and a nozzle drive mechanism 30 for driving the nozzle vane 12. is there.

An annular clearance control plate 14 is located opposite the flange wall of the turbine shroud 2a, which constitutes a part of the turbine housing 2 where the annular gas flow passage 10 is located on the outer periphery of the turbine impeller 5, and the nozzle vane 12. Are connected to each other with a connecting pin at a predetermined interval, the support shaft 12a of each nozzle vane 12 is rotatably attached to the turbine shroud 2a, and the outside of the turbine shroud 2a (left side in FIG. 2). The end portion of the support shaft 12a protruding inward is formed in, for example, a quadrangular prism shape.

A nozzle drive mechanism 30 for opening and closing by driving each nozzle vane 12 of such a vane nozzle in conjunction with each other.
Then, as shown in FIG. 1 and FIG.
An annular drive ring 31 is arranged on the outer periphery of the tip end portion of the turbine shroud 2a coaxial with and is swingably provided in the circumferential direction. The drive pin 31 is connected to the drive pin 31 in correspondence with the number of nozzle vanes 12. The groove 32 that serves as a portion is formed in a U shape having an outer peripheral side opening.

The drive pin connecting portion is not limited to the case where it is formed by the groove 32 that opens to the outer peripheral side, but it may be formed by a circular hole that does not open on the outer peripheral side or a long hole in the radial direction.

A nozzle link plate 33 is used to connect the groove 32 of the drive ring 31 and the support shaft 12a of the nozzle vane 12, and the nozzle vane 12 is provided at one end thereof.
Connecting hole 33 for connecting and fixing the end of the support shaft 12a of the
A is formed, and at the other end, a drive pin portion 33b to be inserted into the groove 32 of the drive ring 31 is provided.

The nozzle link plate 33 has a driving pin portion 3
3b is formed integrally with the link plate portion, is formed by, for example, precision press working (fine blanking processing), and has a recess formed on the back surface to project the drive pin portion 33b.

The drive pin portion 33 provided on the nozzle link plate 33 is not limited to integral molding by precision press working, but may be formed by another working method such as forging or casting.

Further, the drive pin portion 33 is subjected to surface treatment or heat treatment so as to improve wear resistance, if necessary.

The end of the support shaft 12a of the nozzle vane 12 is fitted into the connecting hole 33a at one end of the nozzle link plate 33 and is fixedly connected by caulking, and the drive pin 33b at the other end is formed. The drive ring 31 is inserted into the groove 32 and connected.

The drive ring 31 has through holes 31a for preventing interference with the protruding portion of the support shaft 12a which is fitted into the nozzle link plate 33 and is caulked, corresponding to the number of nozzle vanes 12. Has been formed.

Further, the drive ring 31 is provided with an actuator (not shown) via a drive link 34 so that the drive ring 31 can be oscillated in the circumferential direction and held at a predetermined position.

The nozzle vanes 12 provided between the clearance control plate 14 and the turbine shroud 2a constituting the annular gas flow passage 10 and the nozzle drive mechanism 30 for driving these nozzle vanes 12 are assembled as a unit to form a scroll passage. The clearance control plate 14 at the tip of the unit is mounted in the annular recess 9a formed in the inner side wall of the turbine 9 via the gasket 14a, and is pressed by the cover 35 from the axial outer side of the turbine shroud 2a.
It is fixed to.

In the nozzle drive mechanism 30 of the variable displacement supercharger constructed as described above, the drive ring 31 is oscillated in the circumferential direction via the actuator and the drive link 34 to thereby form the groove 32 which is the drive connecting portion. Drive pin part 3 inserted in
By swinging the nozzle link plate 33 via 3a, the driving force can be transmitted to the support shaft 12a of the nozzle vane 12 connected and fixed to the connecting hole 33a to open and close each nozzle vane 12 in conjunction.

Therefore, according to such a variable displacement supercharger 1, the nozzle drive mechanism 30 rotates the nozzle vanes 12 to throttle the vane nozzles when the gas flow rate at a low speed of the engine is small. When the gas flow rate at a high speed of the engine is large, the nozzle vane 12 is rotated to be opened, and the vane nozzle is opened as the maximum position until the vane nozzle hits the stopper pin 15.
It is possible to improve engine performance by supercharging a wide range from low speed rotation to high speed rotation.

According to the nozzle drive mechanism 30 of such a variable displacement supercharger, the drive ring 31 and the nozzle link plate 3 are provided.
3, the nozzle can be driven, and the number of parts can be reduced.

Further, since the drive pin portion 33a is formed integrally with the nozzle link plate 33, the manufacturing is easier and easier than the case of assembling as a separate body.
It is possible to reduce the number of assembling steps, and in particular, the drive pin portion 3 is formed by fine blanking which is precision press working.
When 3a is integrally formed with the nozzle link plate 33, it is necessary to increase the plate thickness of the base material according to the protruding amount of the drive pin portion 33a, but compared with the case where the drive pin is integrally formed with the drive ring. Since it is a small component and does not require a fork-shaped connecting portion, the weight of the nozzle drive mechanism 30 can be reduced by reducing the total weight while ensuring the required thickness.

Further, since the weight of the drive ring 31 itself is also the drive pin connecting portion by the U-shaped groove 32 as compared with the conventional case where the drive pin is attached by crimping, the weight can be reduced. .

[0037]

As described above in detail with the embodiment, according to the nozzle drive mechanism of the variable displacement supercharger according to claim 1 of the present invention, the annular gas flow on the gas inlet side of the turbine is provided. A variable displacement supercharger having a vane nozzle for varying a gas flow rate in a passage, wherein a plurality of circumferentially arranged nozzle vanes forming the vane nozzle are rotatably supported via a support shaft, and the respective nozzle vanes are supported. While one end of the nozzle link plate is connected and fixed to the support shaft of the nozzle link plate, a drive pin portion is integrally formed at the other end of the nozzle link plate, and swings in the circumferential direction coaxially with the annular gas passage. An annular drive ring is provided, and the drive pin connecting portion formed on the outer peripheral portion of the drive ring is connected to the drive pin portion of the nozzle link plate so that the nozzle vanes are interlocked to drive opening and closing. A drive pin connecting part is formed on the ring, and a drive pin part that is integrally formed on the nozzle link plate can be connected to this to open and close the nozzle vane, which reduces the number of parts and at the same time reduces the weight and man-hours for manufacturing and assembly. Can be reduced.

According to the nozzle drive mechanism of the variable displacement supercharger of the second aspect of the present invention, the drive pin portion of the nozzle link plate is integrally formed by precision press working. The total weight can be suppressed by integrally molding the drive pin part on the nozzle link plate that is smaller than the drive ring by precision press processing, reducing the number of parts and further reducing the weight, and manufacturing and assembly man-hours. Can also be reduced.

Further, according to the nozzle drive mechanism of the variable displacement supercharger according to the third aspect of the present invention, since the drive pin connecting portion of the drive ring is formed by the groove which is open on the outer peripheral side, it is U-shaped. The grooves such as a groove can be reduced in weight and easily processed, and the number of parts can be reduced, and at the same time, the number of manufacturing and assembling steps can be further reduced.

[Brief description of drawings]

FIG. 1 is a partial side view and an exploded partial perspective view of an embodiment of a nozzle drive mechanism of a variable displacement supercharger of the present invention.

FIG. 2 is a partial sectional view of an embodiment of the nozzle drive mechanism of the variable displacement supercharger of the present invention.

FIG. 3 is a vertical sectional view of a variable displacement supercharger to which the present invention is applied and a view taken along the line AA showing a vane nozzle.

4A and 4B are an explanatory view and a disassembled partial perspective view showing a conventional nozzle drive mechanism in which the arrows BB and CC of FIG. 3 are combined.

5A and 5B are a partial cross-sectional view and a partial schematic configuration view showing another nozzle drive mechanism using a conventional structure.

[Explanation of symbols]

1 Variable capacity supercharger 2 turbine housing 2a turbine shroud 3 compressor housing 4 bearing housing 5 turbine impeller 6 compressor impeller 7 Turbine shaft 8 gas inlets 9 scroll passages 9a recess 10 annular gas flow path 11 gas outlet 12 nozzle vanes 12a support shaft 14 Clearance control plate 15 Stopper pin 30 Variable capacity turbocharger nozzle drive mechanism 31 Drive ring 32 grooves (drive pin connection part) 33 Nozzle link plate 33a Drive pin section 33b Connection hole 34 Drive Link 35 cover

Claims (3)

[Claims] 1. A variable capacity supercharger comprising a vane nozzle for varying a gas flow rate in an annular gas flow path on a gas inlet side of a turbine, wherein a plurality of nozzle vanes forming the vane nozzle are arranged in a circumferential direction. Is rotatably supported via a support shaft, one end of the nozzle link plate is connected and fixed to the support shaft of each nozzle vane, and a drive pin portion is integrally formed on the other end of the nozzle link plate, An annular drive ring that oscillates in the circumferential direction is provided coaxially with the annular gas flow path, and the drive pin connection portion of the nozzle link plate is connected to the drive pin connection portion formed on the outer peripheral portion of the drive ring. A nozzle drive mechanism for a variable-capacity turbocharger, which drives opening and closing by interlocking nozzle vanes. 2. The nozzle drive mechanism for a variable displacement supercharger according to claim 1, wherein the drive pin portion of the nozzle link plate is integrally formed by precision press working. 3. The nozzle drive mechanism for a variable displacement supercharger according to claim 1, wherein the drive pin connecting portion of the drive ring is formed by a groove having an outer peripheral side opening.