JP2000064846A - Turbine frame for variable vane type turbo-charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel turbine frame eliminating all the cutting works, in this way, shortening a total work time, and attaining remarkable reduction of a cost, by basically reconsidering a technical common sense constituting the turbine frame of a turbocharger having a single function by a single member, and constituting the turbine frame divided into a plurality of members. SOLUTION: This turbine frame 2 has a boss part 21 provided with a variable mechanism 3 and has a vane mounting flange part 22 for mounting a variable vane 1. In the vane mounting flange part 22, an integral flange segment 26 integrally formed with the boss part 21 and a separate unit flange segment 27 formed in a separate unit therefrom are integrally formed by a fit-in pin or a caulking pin.

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 turbine frame 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 turbine frame which is the object of the present invention. In addition to the complicated shape, the cutting process has been the mainstream because of the strict accuracy required for finishing dimensions. 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]

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and the technical common sense that a turbine frame having a single function is composed of a single member has been fundamentally reviewed. By cutting the turbine frame into multiple parts and constructing it, all cutting work is eliminated,
By doing so, we attempted to develop a new turbine frame that shortened the total processing time and drastically reduced the cost.

[0005]

That is, a turbine frame for a variable vane type turbocharger according to claim 1 is
It has a boss portion and a vane mounting flange portion that has a larger diameter than the boss portion, and the vane mounting flange portion is formed by combining flange segments having different diameters of at least two types, and one of the flange segments is , The integral flange segment formed integrally with the boss portion, while the other flange segment is a separate flange segment formed separately from the boss portion and the integral flange segment, and separate from the integral flange segment. It is characterized by being integrated with a body flange segment. According to the present invention, the turbine frame, which has been conventionally regarded as a common general knowledge to be composed of a single member, is formed by combining at least two kinds of different members. Therefore, each member can be processed without applying cutting work. Precise machining is possible, the machining efficiency of the turbine frame is dramatically improved, and the cost can be significantly reduced.

Further, in the turbine frame for a variable vane turbocharger according to a second aspect, in addition to the requirements according to the first aspect, the integral flange segment and the separate flange segment are integrated by a press-fit pin or a caulking pin. It is characterized by being called. According to the present invention, it is possible to more reliably integrate the integral flange segment and the separate flange segment to form a specific structure for forming the vane mounting flange portion.

Further, in the turbine frame for a variable vane type turbocharger according to claim 3, in addition to the requirements according to claim 1 or 2, the integral flange segment has a flange portion formed at an end of a boss portion. It is characterized by. According to the present invention, the integral flange segment can be processed more precisely by drawing or the like.

Further, in the turbine frame for a variable vane type turbocharger according to a fourth aspect, in addition to the requirement according to the first, second or third aspect, the separate flange segment is made of at least two kinds having different diameters. It is characterized by having a flange portion. According to the present invention, a step can be formed in the flange portion in which the diameter of the separate flange segment is different, and the variable mechanism can be smoothly rotated at this step portion.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. In the description, the turbine frame 2 of the present invention will be described while the exhaust guide assembly A of the turbocharger to which the present invention is applied is 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 boss portion 21 of the turbine frame 2.
It comprises a variable mechanism 3 provided on the side for rotating the variable vane 1 by a certain 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. A plurality of these are provided along the outer periphery of the exhaust turbine T, each of which is rotatably set to adjust the exhaust gas flow rate, and comprises a vane blade portion 11 and a vane shaft portion 12. Is. 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.
The vane shaft portion 12 is fixedly provided on the vane blade portion 11, and corresponds to the rotating shaft of the vane blade portion 11. As an example, the vane blade portion 11 and the vane shaft portion 12 are separately formed at an initial stage, and then the vane blade portion 11 is fitted into the tip portion of the vane shaft portion 12 and fixed by welding or the like. It is something. Further, the rotation base end side of the vane shaft portion 12 is fixed to the variable mechanism 3 to be described later by crimping or the like and is rotatably supported.

Next, the turbine frame 2 of the present invention will be described. This is literally configured as a frame member of an exhaust turbine T and rotatably supports a plurality of variable vanes 1, and as an example, as shown in FIGS. It is provided with a mounting flange portion 22. 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 includes the variable vane 1
The vane shaft portion 12 is rotatably supported. For this reason, the same number of shaft insertion holes 23 as the variable vanes 1 are formed in the peripheral portion of the flange at equal intervals. Also, the shaft insertion hole 23
As an example, four positions are provided on the outer peripheral portion of the pin hole 25 for fixing the pin 24 that holds the mounting width of the variable vane 1.
Is provided.

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. After the integral flange segment 26 and the separate flange segment 27 are separately formed by, for example, drawing or fine blanking,
It is integrally combined with a press-fitting pin, a crimping 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.
Furthermore, when joining with a press-fit pin etc., the pin member is
If a material having a higher coefficient of thermal expansion than the member of the vane mounting flange 22 is applied, the fixed state of the vane mounting flange 22 can be more reliably maintained even when the exhaust guide assembly A is operating at a high temperature. By the way, to give an example of this material, SUS402J2 etc.
SUS440C or the like is applied to the vane mounting flange 22.

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 closely contact 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. The integral flange segment 26 and the separate flange segment 2
7, the flange portions 26a, 27a and 27b are formed by drawing, and then the shaft insertion hole 23 and the pin hole 25 are formed by fine blanking.

In this way, the vane mounting flange portion 22 is
By forming two types of flange segments having different diameters in combination, it is possible to divide and configure the turbine frame 2 which was conventionally considered to be a single member in the technical common sense. Further, by adopting such a configuration, in the processing of each member, sufficient dimensional accuracy can be obtained without cutting, and the processing efficiency of the turbine frame 2 is dramatically improved.
Furthermore, in this embodiment, the vane mounting flange 22
Is formed by combining two types of flange segments having different diameters, but may be formed by combining three or more types of flange segments, and the separate flange segment 27 may also include three or more types of flange portions having different diameters. It may be formed.

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.

[0016]

According to the turbine frame for a variable vane type turbocharger according to the first aspect of the present invention, at least two or more different members are provided for the turbine frame 2 which has been conventionally considered to be a single member. Since they are formed in combination, each member can be precisely processed without applying cutting work, the machining efficiency of the turbine frame can be dramatically improved, and a significant cost reduction can be achieved.

According to the turbine frame for a variable vane type turbocharger of claim 2, the integral flange segment 26 and the separate flange segment 27 are more reliably integrated to form the vane mounting flange portion 22. Is possible.

Furthermore, according to the turbine frame for a variable vane type turbocharger of claim 3, the integral flange segment 26 can be processed more precisely by drawing or the like.

Further, according to the turbine frame for a variable vane type turbocharger of claim 4, the two flange portions 2 in which the diameters of the separate flange segments 27 are different from each other.
A step is formed at 7a and 27b, and the variable mechanism 3 can be smoothly rotated at this step.

[Brief description of drawings]

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

FIG. 2 is an explanatory view showing an integral flange segment (a),
FIG. 6B is an explanatory view showing a separate flange segment, and FIG. 7C is a view showing a state 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 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 (4)

[Claims] 1. A boss portion, and a vane mounting flange portion having a diameter larger than that of the boss portion. The vane mounting flange portion is formed by combining at least two kinds of flange segments having different diameters, and a flange. One of the segments is an integral flange segment formed integrally with the boss portion, while the other flange segment is a separate flange segment formed separately from the boss portion and the integral flange segment, and A turbine frame for a variable vane type turbocharger, wherein an integral flange segment and a separate flange segment are integrated. 2. The turbine frame for a variable vane turbocharger according to claim 1, wherein the integral flange segment and the separate flange segment are integrated by a press-fit pin or a crimp pin. 3. The turbine frame for a variable vane turbocharger according to claim 1, wherein a flange portion of the integral flange segment is formed at an end portion of a boss portion. 4. The turbine frame for a variable vane turbocharger according to claim 1, 2 or 3, wherein the separate flange segment includes at least two types of flange portions having different diameters. .