JP2000064849A - Variable vane applied to variable vane type turbo- charger and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel variable vane and a method of manufacture thereof eliminating all the cutting works and rapidly improving work efficiency, by basically reconsidering a technical common sense constituting the variable of a turbocharger having a single function by a single member, and constituting the variable vane by two kinds of members. SOLUTION: This variable vane 1 is formed out of a vane blade part 11 and a vane shaft part 12, and these vane blade part 11 and vane shaft part 12 are formed individually in a start condition. After the vane shaft part 12 pinches the vane blade part 11 in a hold slit 12a formed on its tip, it is fixed by welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbocharger, which is one of engine superchargers, and more particularly to a variable vane constituting the turbocharger.

[0002]

BACKGROUND OF THE INVENTION A turbocharger is a device for rotating an exhaust turbine with energy of exhaust gas and pushing air into an engine by a compressor directly connected to the exhaust turbine for power up. By the way, when the engine rotates at a low speed, the exhaust turbine hardly works due to a decrease in the exhaust flow rate.Therefore, in the case of an engine that can rotate up to a high engine speed range, the turbine feels like it has a feeling of rattling and it blows all at once. The time required to go up is inevitable that so-called turbo lag will occur. In addition, originally, there was a problem that it was difficult to obtain a turbo effect in a diesel engine with a low engine speed. For this reason, VGS type turbochargers have been developed that operate efficiently even at low rotation speeds. This is a system in which a small exhaust flow rate is narrowed down by a variable vane (blade) to increase the speed of exhaust and the work of the exhaust turbine is increased so that high output can be exhibited even at low speed rotation. For this reason, the VGS type requires a variable mechanism of a variable vane separately, and the peripheral components have to be more complicated in shape and the like as compared with the conventional ones.

On the other hand, since this type of turbo equipment is used in a high temperature atmosphere, a material such as SUS310S having strong heat resistance is applied to the variable vane targeted by the present invention, and its processing is described above. In addition to the complicated shape, the cutting process has been the mainstream because the dimensional accuracy of finishing is strictly required. However, since materials such as SUS310S have strong heat resistance and are difficult to cut, in reality, the cutting process itself requires a considerable amount of time, and therefore there is a certain limit in cost reduction.

[0004]

The present invention has been made in view of such a background, and the technical common sense that a variable vane having a single function is constituted by a single member has been fundamentally reviewed. By dividing the variable vane into multiple parts and eliminating all cutting work, this shortens the processing time in total, and the development of a new variable vane and its manufacturing method that drastically reduced the cost. I tried.

[0005]

That is, the variable vane applied to the variable vane type turbocharger according to claim 1 is a member having a vane blade portion and a vane shaft portion, wherein the vane blade portion and the vane shaft are formed. The parts are formed separately in the starting state, and the vane shaft part is fixed by welding after sandwiching the vane blade part in the holding slit formed at the tip thereof. According to the present invention, the variable vane, which was conventionally regarded as a common general knowledge to be composed of a single member, is divided into two different members of the vane blade portion and the vane shaft portion, and is formed by combining them. All time-consuming cutting operations can be eliminated, the processing efficiency of variable vanes is dramatically improved, and significant cost reductions can be achieved.

A method for manufacturing a variable vane applied to a variable vane type turbocharger according to a second aspect is such that a long forging material having the same cross section as the blade portion of the variable vane is cut at a constant width dimension, As the vane blade member, the pin-shaped vane shaft member is formed with a holding slit at its tip for sandwiching the vane blade portion, and the vane blade portion is sandwiched between the holding slits and then welded. The vane blade portion and the vane shaft portion are integrated with each other. According to the present invention, the variable vane, which was conventionally regarded as a common general knowledge to be composed of a single member, is formed by combining two different members. Therefore, it is possible to eliminate all the cutting work that requires a considerable time, and to change the variable vane. Vane can be processed efficiently.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. In the description, while explaining the exhaust guide assembly A of the turbocharger to which the variable vane 1 of the present invention is applied, the variable vane 1 will also be described, and then the manufacturing method of the variable vane 1 will be described. The exhaust guide assembly A is for narrowing the exhaust gas and setting the exhaust flow rate when the engine is rotating at a low speed. As an example, the exhaust guide assembly A is provided on the outer periphery of the exhaust turbine T to set the exhaust flow rate substantially. Variable vane 1, a turbine frame 2 that rotatably supports the variable vane 1, and a variable mechanism 3 that is provided on the boss portion 21 side of the turbine frame 2 and that rotates the variable vane 1 at a fixed angle.
And a holding plate 4 for holding the variable vane 1 so as to sandwich it from the opposite side of the turbine frame 2. Each component will be described below.

First, the variable vane 1 will be described. This is an example of an exhaust turbine T as shown in FIGS.
A plurality of arcs are provided along the outer circumference of each of them, and each of them is rotatably set to adjust the exhaust flow rate,
The vane blade portion 11 and the vane shaft portion 12 are provided. The vane blade portion 11 has a constant width according to the width dimension of the exhaust turbine T, and the cross-section in the width direction thereof is formed into a substantially wing shape, and the exhaust gas is effectively directed to the exhaust turbine T. ing. Vane shaft 1
Reference numeral 2 is fixedly provided on the vane blade portion 11, and corresponds to a rotating shaft of the vane blade portion 11.

Since the vane blade portion 11 and the vane shaft portion 12 are separately formed in the initial stage and then integrated by welding, the vane blade portion 11 is previously formed at the tip portion of the vane shaft portion 12. A holding slit 12a for fitting is formed. Further, since the holding slits 12a are fitted with the vane blade portions 11 and at the same time, the thickness dimension of the airfoil cross-section differs from portion to portion, so that the holding slits 12a have a positioning action when fixing the vane blade portions 11. Further, the vane shaft portion 12 has a step 12b on the support base end side, is fixed to the variable mechanism 3 described later by caulking, and is rotatably supported.

Next, the turbine frame 2 will be described. This is literally configured as a frame member of the exhaust turbine T and rotatably supports a plurality of variable vanes 1, and as an example, as shown in FIG. 1, a boss portion 21 and a vane mounting flange. Part 2
2 and. A variable mechanism 3 described later is provided along the peripheral surface of the boss portion 21. On the other hand, the vane mounting flange portion 22 rotatably supports the vane shaft portion 12 of the variable vane 1. Therefore, the same number of shaft insertion holes 23 as the variable vane 1 are formed in the peripheral portion of the flange at equal intervals. ing. Further, pin holes 25 for fixing the pins 24 holding the mounting width of the variable vane 1 are provided at four locations on the outer peripheral portion of the shaft insertion hole 23, for example.

The vane mounting flange portion 22 comprises two types of flange segments having different diameters. The one integrally formed with the boss portion 21 is an integral flange segment 26, which is formed separately. What is done is distinguished as a separate flange segment 27. The integral flange segment 26 and the separate flange segment 27 are separately formed by, for example, drawing or fine blanking, and then integrally combined by a press-fit pin, a crimp pin, or the like. The integral flange segment 26 and the separate flange segment 27 can be integrated by various joining forms such as joining by screwing a screw or joining by brazing, in addition to the press-fitting pin and the crimping pin. Further, in the case of joining with a press-fitting pin or the like, if the pin member is made of a material having a higher coefficient of thermal expansion than the member of the vane mounting flange 22, the vane mounting flange 22 can be operated even when the exhaust guide assembly A has a high temperature. The fixed state of can be more reliably maintained.

The integral flange segment 26 is formed by forming a flange portion 26a at the end of the boss portion 21. The separate flange segment 27 joined so as to be in close contact with the flange portion 26a has the shaft insertion hole 23. It comprises a formed flange portion 27a and a flange portion 27b formed to have a larger diameter. A step portion between the flange portions 27a and 27b forms a relief portion when the variable mechanism 3 described later is rotated. Note that it has been conventionally common technical knowledge that the turbine frame 2 is also formed of a single member similarly to the variable vane 1.
However, by constructing the vane mounting flange portion 22 by dividing it into the two types of flange segments as described above, it is possible to eliminate all the time-consuming cutting processing even in the processing of the turbine frame 2 and to achieve a great efficiency improvement. There is.

Next, the variable mechanism 3 will be described. This is attached to the boss portion 21 side of the turbine frame 2, adjusts the exhaust flow rate by rotating the variable vane 1, and comprises a setting plate 31 and a link portion 33. The setting plate 31 is, for example, formed in a disk shape having an opening in the central portion, and the same number of rotating shafts 32 as the variable vanes 1 are provided at equal intervals on the peripheral portion thereof. On the other hand, the link portion 33 transmits the rotation of the setting plate 31 to the variable vane 1, and as an example, two oval connecting members 34 connected to the rotation shaft 32 and the vane shaft portion 12, respectively, It is rotatably connected by a connecting shaft 35. When the engine rotates at a low speed, the setting plate 31 of the variable mechanism 3 is rotated to move the link portion 3
3 is transmitted to the vane shaft portion 12 and the variable vane 1 is rotated as shown in FIG. 3, and the exhaust gas is appropriately set so as to be efficiently directed to the exhaust turbine T. The holding plate 4 is attached so as to sandwich the variable vane 1 from the opposite side of the turbine frame 2, and holds the attachment width of the variable vane 1 together with the pin 24.

Next, a method of manufacturing the variable vane 1 will be described. The variable vane 1 includes a vane blade portion 11 and a vane shaft portion 1.
The vane blade portion 11 is first manufactured by pulling a long forged material having a length of about 30 cm to 50 cm several times from a die having an appropriate shape, and finally producing a predetermined blade. After being made into a long forging material having a shaped cross section, it is cut by a diamond cutter or the like at regular intervals according to the width dimension of the exhaust turbine.

On the other hand, the vane shaft portion 12 is, as an example, sandwiched by a so-called header machine in a state in which the head portion of a rod-shaped material is projected by an appropriate length, and the head portion is hit with an appropriate die member to form a holding slit 12a, It is cut into an appropriate length. Along with this, a step 12b for fixing caulking or the like is formed on the other tip portion by drawing or the like.

After that, the vane blade portion 11 is sandwiched between the holding slits 12a and integrated by laser welding as an example. The holding slit 12a
Since the vane blade portion 11 is sandwiched and the thickness dimension of the airfoil cross-section varies from part to part, it has a positioning action when fixing the vane blade part 11, and the setting of the fixing position is more accurate. In addition, it can be done more easily.
Further, by dividing the variable vane 1 into the vane blade portion 11 and the vane shaft portion 12 and forming them as described above, sufficient dimensional accuracy can be achieved without cutting and the machining efficiency is dramatically improved. Is.

[0017]

According to the invention of claim 1 or 2,
The variable vane 1 which has been conventionally regarded as a technical common sense to be composed of a single member is divided into two different members, that is, the vane blade portion 11 and the vane shaft portion 12, and is formed by combining them, so that it takes a lot of time. It is possible to eliminate all the cutting work that has been spent, dramatically improve the processing efficiency of the variable vane 1, and achieve a significant cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view (a) showing a turbocharger to which a variable vane of the present invention is applied, and an exploded perspective view (b) showing an exhaust guide assembly.

FIG. 2 is an explanatory view (a) showing a vane blade portion, an explanatory view (b) showing a vane shaft portion, and an explanatory view (c) showing a variable vane in which these are integrated.

FIG. 3 is an explanatory diagram showing a state in which a variable vane is rotated to adjust an exhaust flow rate.

[Explanation of symbols]

1 variable vane 2 turbine frame 3 variable mechanism 4 holding plate 11 vane wings 12 Vane shaft 12a holding slit 12b step 21 Boss 22 Vane mounting flange 23 Shaft insertion hole 24 pin 25 pin hole 26 integrated flange segment 26a Flange part 27 Separate flange segment 27a Flange part 27b Flange part 31 Setting board 32 rotation axis 33 Link 34 Connecting member 35 connection shaft A Exhaust guide assembly T exhaust turbine

Claims (2)

[Claims] 1. A member in which a vane blade portion and a vane shaft portion are formed, the vane blade portion and the vane shaft portion are separately formed in a starting state, and the vane shaft portion is formed at a tip thereof. A variable vane applied to a variable vane turbocharger, characterized in that the vane blade is sandwiched between the formed holding slits and then fixed by welding. 2. A long forging material having the same cross section as the vane portion of the variable vane is cut into a vane vane member at a constant width dimension, while a pin-shaped vane shaft member is made of: A holding slit for sandwiching the vane blade portion is formed at its tip, and the vane blade portion is sandwiched in the holding slit, and then the vane blade portion and the vane shaft portion are integrated by welding. A variable vane manufacturing method applied to a vane turbocharger.