JP2002349275A - Turbine housing of supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing of a supercharger capable of automatically adjusting a flow rate of exhaust gas flowing in a scroll part even if a waist gate valve is not used, and capable of reducing the size and weight. SOLUTION: This turbine housing 11 has the scroll part, a cover part 13, and flange parts 16 and 17. The scroll part is dividedly formed as a first scroll part and a second scroll part 12b. The second scroll part 12b has half-split parts 12c and 12d dividedly formed in a half-split shape. A slide part 20 by combining the mutual half-split parts 12c and 12d can open and close in response to the flow rate of the exhaust gas flowing in the scroll part. The flow rate of the exhaust gas flowing in the scroll part is automatically adjusted by switching an opening state and a closing state in this slide part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine housing of an exhaust turbine driven supercharger.

[0002]

2. Description of the Related Art Conventionally, as a turbine housing of this type of turbocharger, for example, the one shown in FIGS. 9 to 11 is known. It is designed to be mounted on a vehicle and used to control charging pressure. FIG. 9 is a front view showing a turbine housing according to the related art. FIG. 10 is a rear view showing a turbine housing according to the related art. FIG. 11 is a cross-sectional view showing a turbine housing according to the related art, and is a cross-sectional view taken along line AA of FIG. 9.

As shown in FIGS. 9 to 11, a turbine housing 101 includes a metal scroll portion 102 forming a spiral exhaust gas flow path, and a scroll portion 10 formed of a metal.
2 made of a metal cover 103 enclosing the cover 2 with a gap
And metal flange portions 104, 105, and 106 to which the scroll portion 102 and the cover portion 103 are attached. Further, inside the turbine housing 101,
A turbine 108 having a turbine blade 107 indicated by a two-dot chain line in FIG. 11 is accommodated.

The scroll part 102 and the turbine blade 1
07, a minute clearance is set in order to enhance the performance of the turbine 108. Cover section 103
Are formed from two divided members, which are joined by welding to be integrated. Scroll unit 10
Both ends of the cover 2 and the cover 103 are fixed to the flanges 105 and 106 by welding.

The turbine housing 101 has an exhaust gas inlet 109 for introducing exhaust gas into the scroll portion 102, and a bypass flow outlet for discharging excess waste gas from the scroll portion 102 and discharging from the wastegate port 113. A passage 110, an exhaust gas outlet 111 for exhausting exhaust gas flowing through the scroll portion 102, and an insertion hole 112 for inserting the turbine 108 are formed.

In the turbine housing 101, an exhaust manifold (not shown) is connected to the flange 104 on the exhaust gas inlet 109 side, and an elbow (not shown) is connected to the flange 105 on the exhaust gas outlet 111 and the waste gate port 113 side. Are connected. Further, the flange portion 106 on the insertion hole 112 side is used.
Is connected to one end of a center housing (not shown), and the other end of the center housing is connected to a compressor housing (not shown).
The supercharger according to the prior art includes a turbine housing 101,
A turbine 108, a center housing, a compressor housing, a wastegate valve and the like are provided.

In the exhaust gas introduced from the exhaust manifold into the scroll portion 102 through the exhaust gas inlet 109, excess exhaust gas is discharged from the waste gate port 113 to the elbow side through the bypass flow passage 110. Exhaust gas that has been adjusted and not adjusted for emission (circulated in the scroll portion 102) hits the turbine blade 107 to rotate (drive) the turbine 108, and at the same time, is discharged to the elbow side via the exhaust gas outlet 111. Is set.

Here, the wastegate port 113 is
It is not shown when the flow rate of the exhaust gas in the scroll portion 102 is excessive (when the supercharging pressure of the supercharger is excessive), for example, when the engine speed of the vehicle is in a high rotation range (for example, 4000 rpm or more). When the exhaust gas flow rate is not excessive (when the supercharging pressure of the supercharger is not excessive), for example, the engine speed is in a low rotation range (for example, 40 rpm).
(Less than 00 rpm), it is set to be closed by the waste gate valve. Such control of the wastegate valve prevents the turbine 108 from rotating more than necessary, etc.
The flow rate of the exhaust gas flowing through the inside of the fuel cell 02 is maintained in a good state. That is, the turbine housing 101
The supercharging pressure of the turbocharger equipped with is controlled to be in a good state.

[0009]

However, in the above-described conventional turbocharger turbine housing 101, unless the control is performed using a wastegate valve or the like,
The flow rate of the exhaust gas flowing through the scroll portion 102 could not be maintained in a good state. In addition, since it is necessary to provide the wastegate valve and the wastegate port 113 in the turbine housing 101, the turbine housing 101 and, consequently, the turbocharger are increased in size and weight. Furthermore, in the turbine housing 101 according to the related art, there is a possibility that noise such as a vibration sound caused by rotation of the turbine 108 may be generated.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to automatically adjust the flow rate of exhaust gas flowing through a scroll without using a waste gate valve or the like. It is another object of the present invention to provide a turbocharger turbine housing capable of reducing the size and weight. Another object is to provide a turbocharger turbine housing capable of suppressing noise such as vibration noise.

[0011]

In order to achieve the above object, the invention according to the first aspect of the present invention is directed to a metal scroll portion forming a spiral exhaust gas flow path and a state in which the scroll portion has a gap. In a turbine housing of a turbocharger, comprising a metal cover portion encapsulated with a metal flange portion to which the scroll portion and the cover portion are attached, and wherein a turbine is housed therein, the scroll portion The first
A scroll portion and a second scroll portion are divided and formed, and at least one of the divided first and second scroll portions is divided and formed so as to be further divided into half.
The half-split parts are slidably combined with each other so that they can be opened and closed, and the first scroll part and the second scroll part are fitted in a slidable state. And

According to the first aspect of the present invention, when the exhaust gas flows through the metal scroll portion forming the spiral exhaust gas flow path, the scroll portion is caused by the heat of the exhaust gas. Exhaust gas impinges on the turbine blades of the turbine housed inside the turbine housing and causes the turbine to rotate (drive) while thermally expanding outward.

[0013] In this case, the scroll portion is formed so as to be divided into a first scroll portion and a second scroll portion.
At least one of the scroll portion and the second scroll portion is divided and formed so as to be further divided in a half shape, and the divided portions formed in the half shape are combined in a slidable state and can be opened and closed. The first scroll portion and the second scroll portion are slidably fitted to each other. Therefore, due to the exhaust gas flowing in the scroll part, a part obtained by combining the parts formed in a half-split shape may slide, or a fitting part between the first scroll part and the second scroll part may slide. Is possible.

That is, the turbine housing of the turbocharger according to the present invention has a structure in which the volume of the scroll portion can be changed by a slide structure provided in the scroll portion, and the exhaust gas flowing through the scroll portion of the turbine housing. The volume of the scroll section also changes according to the gas flow rate. In this case, the capacity of the scroll section tends to increase as the flow rate of the exhaust gas increases, and conversely, the capacity of the scroll section tends to decrease as the flow rate of the exhaust gas decreases.

In particular, when a portion formed by combining the halves divided and formed slides, the combined portion is openable and closable, so that it corresponds to the flow rate of the exhaust gas flowing through the scroll portion. As a result, switching between the closed state and the open state of the combined portion is performed.

More specifically, the closed state (when the flow rate of the exhaust gas flowing through the scroll portion is not excessive,
That is, when the rotational speed of the engine of the vehicle is low (for example, 4
000 rpm), the communication state between the inside of the scroll part and the inside of the cover part is interrupted, and the open state [when the flow rate of the exhaust gas flowing through the scroll part is excessive,
That is, when the rotation speed of the engine of the vehicle is in a high rotation range (for example, 4
000 rpm or more)], the inside of the scroll portion and the inside of the cover portion are in communication with each other.

In this open state (communication state), when the inside of the scroll part and the inside of the cover part are in communication, the capacity of the cover part is utilized in addition to the capacity of the scroll part, and the capacity of the part through which the exhaust gas flows is greatly increased. Increase. In other words, by being in the open state (communication state), excess exhaust gas is discharged from the inside of the scroll portion into the cover portion, and the flow rate of the exhaust gas flowing through the scroll portion is maintained in a good state. , The turbine is prevented from rotating more than necessary.

As described above, the capacity of the portion of the turbine housing through which the exhaust gas flows can be varied in accordance with the flow rate of the exhaust gas flowing through the scroll portion of the turbine housing of the turbocharger according to the present invention. With this setting, the flow rate of the exhaust gas flowing through the scroll portion is automatically adjusted and maintained in a good state without using a waste gate valve or the like as in the related art.

Further, as described above, since the flow rate of the exhaust gas flowing through the scroll portion can be automatically adjusted, the wastegate valve and the wastegate port used in the prior art are not required, and the turbine is not used. The housing and, consequently, the size and weight of the supercharger are reduced. In addition, since there is no need to provide a wastegate port and a wastegate valve in the turbine housing of the turbocharger, the degree of freedom in designing the turbine housing is increased.

Further, a gap is formed between the metal scroll portion and the metal cover portion, and since the scroll portion is covered by the cover portion, the gap serves as a heat insulating layer. At the same time, the cover part serves to maintain the temperature of the exhaust gas. As a result, the heat of the exhaust gas is less likely to be transmitted to the outside (it is less likely to be robbed),
Effective utilization of the heat energy of the exhaust gas is achieved. That is, by using the thermal energy of the exhaust gas, it is possible to reduce the time required to reach the activation temperature of the catalyst disposed downstream of the turbine housing immediately after the start of the engine of the vehicle. .

According to a second aspect of the present invention, in the turbocharger housing of the first aspect, the first scroll portion and the second scroll portion are slidably fitted to each other. The gist of the present invention is that at least one of the enlarged diameter portion and the reduced diameter portion is formed.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, a diameter-enlarging portion or a diameter-reducing portion formed on at least one of the first scroll portion and the second scroll portion. With this configuration, when the first scroll portion and the second scroll portion are fitted in a slidable state, the fitting operation is performed simply and reliably. In addition, the first scroll portion and the second scroll portion are formed by the enlarged diameter portion or the reduced diameter portion.
The fitting part with the scroll part slides easily.

According to a third aspect of the present invention, in a turbine housing of a supercharger according to the first or second aspect,
The gist is that a metal mesh is interposed between at least one of the first scroll part and the second scroll part and the cover part. Here, the “metal mesh” refers to a metal wire formed by weaving a metal wire into a predetermined shape.

According to the third aspect of the present invention, in addition to the functions of the first and second aspects of the present invention, a gap between at least one of the first scroll portion and the second scroll portion and the cover portion is provided. By the metal mesh interposed, the noise such as the vibration noise caused by the rotation of the turbine is absorbed and moderated and suppressed. Further, the gap between at least one of the first scroll portion and the second scroll portion and the cover portion is reliably held by the interposition of the metal mesh.

According to a fourth aspect of the present invention, there is provided a metal scroll portion forming a spiral exhaust gas flow path, a metal cover portion enclosing the scroll portion with a gap, and the scroll portion. And a metal flange portion to which the cover portion is attached, and in a turbine housing of a supercharger in which a turbine is housed, the scroll portion is divided and formed so as to be half-split, The gist is that the halves divided and formed are combined in a slidable manner so that they can be opened and closed.

The invention described in claim 4 and the claim 1
The difference from the invention described in (4) is that the scroll portion is mainly formed by dividing the first scroll portion and the second scroll portion and both are fitted in a slidable state. According to the invention described above, the same operation as the invention described in claim 1 is exerted.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing a turbine housing according to the present embodiment, and is a cross-sectional view taken along line BB of FIG. FIG. 2 is an enlarged sectional view showing a part of the scroll portion and the cover portion, and is a sectional view showing an opened state of the second scroll portion. FIG. 3 is a front view showing the turbine housing in the present embodiment. FIG. 4 is a longitudinal sectional view showing the turbine housing in the present embodiment, and is a sectional view taken along line CC of FIG. FIG. 5 is a side view showing the turbine housing in the present embodiment. FIG.
FIG. 2 is a rear view showing the turbine housing in the present embodiment. FIG. 7 is a side view showing the turbine housing in the present embodiment.

As shown in FIGS. 1 to 7, the turbine housing 11 of the turbocharger driven by the exhaust turbine is provided with a scroll portion 12 made of stainless steel having a small heat capacity and excellent heat resistance and corrosion resistance. A cover portion 13 made of stainless steel, a SUS mesh 14 externally fitted to the scroll portion 12, and flange portions 15, 16, 17 are provided. A turbine 19 having a turbine blade 18 indicated by a two-dot chain line in FIG. 1 is accommodated in the turbine housing 11. In the present embodiment, the turbine housing 11
The scroll part 1 has a double pipe structure of a scroll part 12 corresponding to an inner pipe and a cover part 13 corresponding to an outer pipe.
2 is covered by the cover 13 with a gap.

Further, the turbine housing 11 of the present embodiment has three flange portions 15, 16, 17, and the cover portion 13 and the scroll portion 12 are welded to these flange portions 15, 16, 17. It is joined by. The flange portions 15, 16, 17 are castings formed of stainless steel cast steel having excellent heat resistance and corrosion resistance.

As shown in FIGS. 1 and 4, the scroll portion 12 for forming the exhaust gas flow path is formed in a spiral shape, and the first scroll portion 12a and the second scroll portion 1 are formed.
2b. Further, the second scroll portion 12b is divided and formed so as to be further divided into half, and includes a half portion 12c and a half portion 12d. First
The half portions 12c and 12d of the scroll portion 12a and the second scroll portion 12b are respectively formed into predetermined shapes by spinning.

As shown in FIG. 4, the first scroll portion 12a is joined to the flange portion 15 by welding. As shown in FIG. 1, the second scroll portion 12b is formed by dividing the second scroll portion 12b in a half-split shape and combining them in a slidable state to form the second scroll portion 12b. One end of 12c is joined to the flange 17 by welding, and one end of the half 12d is joined to the flange 16 by welding.

The other end of the half part 12c and the half part 12
The portion combined with the other end of d is a slidable slide portion 20, which can be opened and closed in accordance with the flow rate of the exhaust gas flowing through the second scroll portion 12b. . In this case, in the open state, as shown in FIG. 2, the inside of the second scroll portion 12b and the inside of the cover portion 13 are in a communicating state, and in the closed state, as shown in FIG.
As shown in (2), the communication state is cut off.

More specifically, the open state in which the inside of the second scroll portion 12b and the inside of the cover portion 13 are communicated is when the flow rate of the exhaust gas flowing through the inside of the scroll portion 12 is excessive, that is, in the vehicle. The case where the engine speed is in a high rotation range (for example, 4000 rpm or more) and the communication state is cut off and the closed state is set when the flow rate of the exhaust gas flowing through the scroll portion 12 is not excessive,
That is, when the rotational speed of the engine of the vehicle is low (for example, 4
000 rpm). As described above, in accordance with the flow rate of the exhaust gas flowing through the scroll portion 12, the second
The switching between the open state and the closed state of the slide part 20 of the scroll part 12b is set to be automatically performed.

As shown in FIG. 4, in the present embodiment, the first scroll portion 12a is fitted to the second scroll portion 12b in which the half portions 12c and 12d are slidably combined. . In this case, a slightly enlarged diameter portion 21 is formed at the end of the second scroll portion 12b, and the end of the first scroll portion 12a is fitted to the enlarged diameter portion 21. By this fitting state, the fitting part of the first scroll part 12a and the second scroll part 12b is set so as to be slidable.
The first scroll part 12a and the second scroll part 1
Even if the fitting portion 2b slides, the two do not come off.

As shown in FIGS. 1 and 4, in the turbine housing 11 of the present embodiment, the scroll portion 12
, Ie, the slide portion 20 of the combination of the half portion 12c and the half portion 12d of the second scroll portion 12b, and the expansion of the end portion of the first scroll portion 12a and the second scroll portion 12b. The capacity of the scroll part 12 can be changed by the fitting part with the diameter part 21.

That is, the exhaust gas flowing through the scroll portion 12 of the turbine housing 11 slides the slide portion 20 of the combined portion of the half portion 12c and the half portion 12d of the second scroll portion 12b, When the fitting portion between the end of the scroll portion 12a and the enlarged diameter portion 21 of the second scroll portion 12b slides,
The capacity of the scroll part 12 also changes according to the flow rate of the exhaust gas flowing through the scroll part 12.

More specifically, the scroll section 12
As the flow rate of the exhaust gas flowing through the inside increases, the capacity of the scroll part 12 tends to increase. When the flow rate of the exhaust gas becomes excessive, the inside of the second scroll part 12b and the cover part 13 from the state of FIG. The state changes to the state shown in FIG. 2 in which the inside and the outside are in communication with each other, and the capacity of the portion through which the exhaust gas flows is greatly increased. Further, as the flow rate of the exhaust gas flowing in the scroll section 12 decreases, the capacity of the scroll section 12 tends to decrease.

As shown in FIG. 4, the first scroll portion 12
A tongue portion 22 for guiding a part of the exhaust gas is formed in a tongue shape on a side having a small radius of curvature at an end portion of the first scroll portion 12a, and the end portion of the first scroll portion 12a is bent by spinning molding. Is formed. Here, the tongue shape is a shape in which the flow of exhaust gas can be rectified in a state in which a separation boundary layer does not or hardly occur around the tongue portion 22. And the scroll part 12
Exhaust gas flowing through the inside is guided in a good state by the inner surface of the scroll portion 12 and the tongue portion 22.

Further, an exhaust gas inlet 23 for introducing exhaust gas is formed in the first scroll portion 12a.
An exhaust gas outlet 24 for discharging exhaust gas is formed in the second scroll portion 12b. Further, between the first scroll part 12a and the cover part 13, the scroll part 1 is provided.
SUS for maintaining a gap between the cover 2 and the cover 13
A mesh 25 is interposed. As shown in FIG. 1, an insertion hole 26 for inserting (storing) the turbine 19 indicated by a two-dot chain line in the figure is formed in the turbine housing 11.

As shown in FIG. 1 to FIG.
Is provided with a first cover portion 13a and a second cover portion 13b, and each is divided and formed so as to be half-split. The first cover portion 13a is joined to the flange portion 17 by welding, and the second cover portion 13b is
And the first cover portion 13a by welding. In this case, a part of the second cover portion 13b, that is, the seal portion 27 is welded from the outside of the first cover portion 13a in a superimposed state, and the sealability of the cover portion 13 is ensured by the seal portion 27. It has become.

As shown in FIG. 1, in the turbine housing 11 of the present embodiment, a ridge 28 is formed on the flange 17 so as to protrude, and a mating surface between the ridge 28 and the first cover 13a is formed. Halves 1 in a state where
2c is welded through one end (the end opposite to the slide portion 20). By forming the ridges 28 on the flange portion 17, the heat generated during welding does not adversely affect the peripheral portion of the welded portion, and the first cover portion 13a,
Half portion 12c of second scroll portion 12b and ridge portion 28
Is performed in a good condition.

The half part 1 of the second scroll part 12b
On one end side of 2d (opposite side of slide section 20), SU
The S mesh 14 is externally fitted and fixed at a predetermined position by welding. In other words, the SUS mesh 14 is interposed between the second cover part 13b and the half part 12d, so that the movement in the vertical direction in FIG. 1 is restricted. By adopting such a structure, even when the half portion 12d of the second scroll portion 12b is thermally expanded, a minute space for improving the performance of the turbine 19 is provided between the turbine blade 18 and the half portion 12d. The proper clearance is maintained.

Further, the half part 1 of the second scroll part 12b
2d, a throat portion 29 extending in the axial direction of the turbine 19 and an inclined portion 30 gradually reduced in diameter from the throat portion 29 are formed. The throat part 29 of the half part 12d is sandwiched between the second cover part 13b and the flange part 16, and the inclined part 30 of the half part 12d is made of SUS mesh 1
The second cover portion 13b, the throat portion 29 and the flange portion 16 are fixed by welding in this state.

In the present embodiment, as shown in FIG. 1, a reference plane 31 indicated by a chain line in the figure is set along a direction orthogonal to the axial direction of the turbine 19. By setting the reference plane 31 at this position, even when the turbine 19 is mounted on the turbine housing 11, it is possible to mount the turbine 19 with high accuracy.

In the turbine housing 11 of the present embodiment, an exhaust manifold (not shown) is connected to the flange 15 on the exhaust gas inlet 23 side. One end of a center housing (not shown) is connected to the flange portion 17 on the insertion hole 26 side, and a compressor housing (not shown) is connected to the other end of the center housing. Further, an elbow (not shown) is connected to the flange portion 16 on the exhaust gas outlet 24 side. Therefore, the turbocharger according to the present embodiment includes the turbine housing 11 and the turbine 1
9, a center housing, a compressor housing, and the like.

The exhaust gas introduced from the exhaust manifold is introduced into the scroll portion 12 of the turbine housing 11 and flows therethrough. The exhaust gas flowing through the scroll portion 12 hits the turbine blade 18 and rotates the turbine 19 ( Drive), and at the same time, is discharged to the elbow side through the exhaust gas discharge port 24.

Here, the turbine housing 11 of the present embodiment has a case where the flow rate of the exhaust gas in the scroll portion 12 is excessive (when the supercharging pressure of the supercharger is excessive), that is, the rotational speed of the engine of the vehicle. Is in the high rotation range (for example, 4000
(rpm or more), the slide portion 20 is in an open state, and the inside of the second scroll portion 12b and the inside of the cover portion 13 are in communication with each other. When the supply pressure is not excessive), that is, when the rotation speed of the engine is in a low rotation range (for example, less than 4000 rpm), the communication state is cut off.

In the open state (communication state), when the inside of the second scroll part 12b and the inside of the cover part 13 are in communication with each other, the capacity of the cover part 13 is utilized in addition to the capacity of the scroll part 12, and the exhaust gas The capacity of the circulating part is greatly increased. In other words, in the open state (communication state), excess exhaust gas is discharged from the second scroll portion 12b into the cover portion 13 and the flow rate of the exhaust gas flowing through the scroll portion 12 is improved. And rotating the turbine 19 more than necessary.

As described above, the slide structure provided in the scroll portion 12 of the turbine housing 11 in the present embodiment makes the flow rate of the exhaust gas correspond to the flow rate of the exhaust gas flowing through the scroll portion 12. They are kept in good condition. That is, the supercharging pressure of the supercharger including the turbine housing 11 of the present embodiment is controlled so as to be in a favorable state mainly by the slide portion 20 of the second scroll portion 12b.

According to the above-described embodiment, the following effects can be obtained.

According to the present embodiment, the scroll unit 1
2 is provided with a slide structure, the slide portion 20 is slid by exhaust gas flowing in the scroll portion 12, or the end portion of the first scroll portion 12a and the enlarged diameter portion 21 of the second scroll portion 12b are connected to each other. Can be slid.

In this embodiment, the switching between the open state and the closed state of the slide portion 20 of the second scroll portion 12b is automatically performed in accordance with the flow rate of the exhaust gas flowing in the scroll portion 12. Can be.

According to the present embodiment, the slide portion 20
Since the switching between the open state and the closed state can be automatically performed, the flow rate of the exhaust gas flowing through the scroll portion 12 can be adjusted without using the waste gate valve used in the related art. Can be held in a proper state.

According to the present embodiment, the scroll section 1
Since the flow rate of the exhaust gas flowing through the inside 2 can be adjusted, the wastegate valve and the wastegate port used in the related art become unnecessary, and the turbine housing 11 and thus the turbocharger can be reduced in size and weight. . Further, since the structure is simplified, the productivity of the turbine housing 11 can be improved.

According to the present embodiment, it is not necessary to provide a wastegate valve and a wastegate port in the turbine housing 11 of the turbocharger, so that the degree of freedom in designing the turbine housing 11 can be increased.

According to the present embodiment, the scroll unit 1
Even when the flow rate of the exhaust gas flowing through the inside 2 is excessive, it is possible to prevent the turbine 19 from rotating more than necessary by automatically opening the slide portion 20.

According to the present embodiment, the flow rate of the exhaust gas flowing through the scroll portion 12 can be maintained in a good state regardless of the rotation range of the engine of the vehicle.

According to the present embodiment, the scroll section 1
By adopting a structure capable of changing the capacity of No. 2 (the capacity of the portion through which the exhaust gas flows in the turbine housing 11), it is possible to prevent a decrease in turbine efficiency in the entire rotation range of the engine of the vehicle.

In the present embodiment, a gap is formed between the scroll portion 12 and the cover portion 13 and the scroll portion 12 is covered with the cover portion 13. For this reason, the gap can serve as a heat insulating layer, and the cover portion 13 can serve to maintain the temperature of the exhaust gas flowing in the scroll portion 12. Therefore, the heat of the exhaust gas flowing through the scroll portion 12 is less likely to be transmitted to the outside (it is less likely to be robbed), and the thermal energy of the exhaust gas can be effectively used.

According to the present embodiment, by utilizing the heat energy of the exhaust gas, immediately after the start of the engine of the vehicle, until the activation temperature of the catalyst disposed downstream of the turbine housing 11 is reached. Can be shortened.

According to the present embodiment, the enlarged diameter portion 21 is formed at the end of the second scroll portion 12b.
, The end of the first scroll portion 12a is fitted in a slidable state. The enlarged diameter portion 21 makes it possible to easily and reliably fit the first scroll portion 12a with the second scroll portion 12b.

According to the present embodiment, the first scroll portion 12a and the second scroll portion 12b are
Can be easily slid.

According to the present embodiment, the SUS mesh 25 interposed between the first scroll portion 12a and the cover portion 13 absorbs and reduces noise such as vibration noise due to the rotation of the turbine 19. Can be suppressed.

According to the present embodiment, the gap between the first scroll portion 12a and the cover portion 13 can be reliably held by the interposition of the SUS mesh 25. That is, a heat insulating layer between the first scroll part 12a and the cover part 13 can be secured.

According to the present embodiment, one end of the half portion 12 d of the second scroll portion 12 b and the second cover portion 13
The noise such as vibration noise caused by the rotation of the turbine 19 can be absorbed and reduced by the SUS mesh 14 interposed between the SUS mesh 14 and the SUS mesh 14.

According to the present embodiment, the halved portion 12 d and the second cover portion 13 b
Can be reliably held. That is, the half part 12
It is possible to secure a heat insulating layer between d and the second cover portion 13b.

In the present embodiment, as shown in FIG. 1, the reference plane 31 is set along a direction orthogonal to the axial direction of the turbine 19. With this reference plane 31,
Even when the turbine 19 is assembled to the turbine housing 11, it can be assembled with high accuracy.

In the present embodiment, the second scroll unit 1
The SUS mesh 14 is externally fitted to one end of the half portion 12d of the 2b. For this reason, even when high-temperature (for example, 900 ° C.) exhaust gas flows in the scroll portion 12,
The SUS mesh 14 can reliably suppress outward thermal expansion of the portion of the second scroll portion 12b provided near the turbine blade 18 from the outside of the second scroll portion 12b. Therefore, the clearance between the turbine blade 18 and the second scroll portion 12b can be reliably maintained at a predetermined interval, so that a decrease in turbine performance can be reliably prevented.

According to the present embodiment, since the throat portion 29 of the second scroll portion 12b is sandwiched between the second cover portion 13b and the flange portion 16, the throat portion 29 of the second scroll portion 12b is provided. Can be securely fixed at a predetermined position between the second cover portion 13b and the flange portion 16.

According to the present embodiment, the flange portion 17
Since the ridge portion 28 is formed at the first portion, the heat generated at the time of welding does not adversely affect the peripheral portion of the welded portion, and the first portion is formed.
The welding of the cover portion 13a, the half portion 12c, and the ridge portion 28 can be performed in a good state.

According to the present embodiment, the flange portion 17
The first ridge portion 28 formed to project from the first cover portion and the half portion 12c can be easily positioned at the time of welding.

In this embodiment, since the scroll structure is provided in the scroll part 12, the scroll part 12
Scroll portion 12 due to the heat of exhaust gas flowing through
Since the first scroll portion 12a and the second scroll portion 12b can slide and disperse the stress even when the thermal expansion occurs, the concentration of the stress on the scroll portion 12 can be prevented. Therefore, it is possible to prevent the durability and reliability of the turbine housing 11 from being reduced.

According to the present embodiment, scroll unit 1
2 can be prevented, and the function of the turbine housing 11 can be maintained in a stable state for a long period of time.

According to the present embodiment, the scroll unit 1
Since the stress can be prevented from concentrating on the scroll portion 2, it is possible to prevent the scroll portion 12 from being cracked or damaged.

According to the present embodiment, only the end of the first scroll portion 12a is curved by spinning molding.
The tongue 22 in the form of a tongue can be easily formed on the side of the end having the smaller radius of curvature.

In the present embodiment, the tongue portion 22 is formed to have a tongue shape. This tongue part 22
Thereby, since the exhaust gas can be guided in a state where the separation boundary layer does not or hardly occur in the tongue portion 22 of the scroll portion 12, the flow of the exhaust gas in the scroll portion 12 can be made good.

According to the present embodiment, the half portions 12c of the first scroll portion 12a and the second scroll portion 12b,
Since 12d is formed by spinning, it can be manufactured with high precision and at low cost.

The turbine housing 11 of the present embodiment
Is made of stainless steel having excellent heat resistance and corrosion resistance, so that the weight of the turbine housing 11 can be reduced. Further, the turbine housing 11 is hardly affected by heat of the exhaust gas and the like, and the durability and reliability of the turbine housing 11 can be improved.

According to the present embodiment, the temperature of the exhaust gas of the engine can be set to a high temperature range because the turbine housing 11 is formed of a stainless material having excellent heat resistance.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. However, in the configuration and the like of the present embodiment, portions that are the same as those in the above-described first embodiment are given the same reference numerals, and descriptions thereof are omitted. The following description focuses on the differences from the first embodiment. FIG.
FIG. 7 is a cross-sectional view illustrating a turbine housing according to a second embodiment.

As shown in FIG. 8, in the turbine housing 51 of the supercharger according to the present embodiment, the configuration of the second scroll portion 12b, the flange portion 52, and the like is different from that of the first embodiment. .

That is, in the turbine housing 51 of the present embodiment, the half portion 12 of the second scroll portion 12b
SUS over the entire circumference between c, 12e and cover 13
The mesh 53 is interposed, and one end of the half part 12e is connected to the half part 12d (FIG. 1) of the first embodiment.
), The throat portion 29 and the inclined portion 30 are omitted. In this case, the SUS mesh 53 is fixed to the half part 12e by welding so as to sandwich the other end of the half part 12e, and the half part 12e
The SUS mesh 53 also slides in the same direction in conjunction with the sliding of the other end of the SUS mesh. In addition,
The other end of the half part 12c and the SUS mesh 53 are not fixed by welding, and the other end of the half part 12c and the half part 12c are not fixed.
The part combining e with the SUS mesh 53 fixed to the other end of e is a slidable slide part 20.

In the thickness of the SUS mesh 53 in this embodiment (the thickness in the vertical direction in FIG. 8), the thickness between the other end of the half part 12e and the cover part 13 is half. The thickness is set to be larger than the thickness between the other end of the split part 12c and the other end of the half part 12e. Here, the reason why the thickness of the SUS mesh 53 on the slide portion 20 side is reduced is to prevent the exhaust gas from leaking into the cover portion 13 via the SUS mesh 53 in the closed state of the slide portion 20. It is.

Further, in the present embodiment, instead of the SUS mesh 14 (see FIG. 1) in the first embodiment, a flange 52 having the flange 16 further extending toward the turbine blade 18 is provided. Has been adopted. In the flange portion 52 of the present embodiment, the turbine blade 1
8 and a second cover 13b.
And a ridge 55 for welding.

In addition, the ridge 55 and the second cover 13b
Are welded to each other in such a manner that the mating surfaces are flush with each other. By forming the ridge portion 55 on the flange portion 52, the ridge portion 55 and the second cover portion 13b can be welded in a good state without the heat generated during welding adversely affecting the periphery of the welded portion. Becomes Shroud part 54
A minute clearance is set between the turbine blade 18 and the turbine blade 18 in order to enhance the performance of the turbine 19.

According to the present embodiment, the scroll section 12
When the flow rate of the exhaust gas flowing through the inside is excessive (when the supercharging pressure of the supercharger is excessive), that is, when the rotation speed of the engine of the vehicle is in a high rotation range (for example, 4000 rpm or more),
The other end of the half part 12c and the SUS mesh 53 fixed to the other end of the half part 12e are separated from each other, the slide part 20 is opened, and the inside of the second scroll part and the inside of the cover part are in communication. . Conversely, when the flow rate of the exhaust gas flowing through the scroll portion 12 is not excessive (when the supercharging pressure of the supercharger is not excessive), that is, when the engine speed of the vehicle is in a low rotation range (less than 4000 rpm). In the state shown in FIG. 8, the slide portion 20 is in the closed state.

Therefore, according to the present embodiment, it is possible to achieve the same operation and effect as those of the first embodiment. Particularly, in the present embodiment, the half part 1
The SUS mesh 53 interposed over the entire circumference between the 2c, 12e and the cover portion 13 can absorb and reduce noise such as vibration noise caused by rotation of the turbine 19 and suppress it. Also, with the interposition of the SUS mesh 53,
The gap between the second scroll part 12b and the cover part 13 can be reliably held.

It is to be noted that each of the above embodiments can be modified and implemented as follows.

The first embodiment may be combined with the second embodiment. For example, in the turbine housing 11 according to the first embodiment, a SUS mesh may be fixed to the other end of the half portion 12d.

In each of the above-described embodiments, the second scroll portion 12b is divided and formed so as to be formed in a half-shape.
2c, 12d, and 12e.
a may be divided and formed so as to be a half-split shape. That is,
Only the first scroll portion 12a may be formed so as to be half-split, or both the first scroll portion 12a and the second scroll portion 12b may be formed so as to be half-split.

In the above embodiments, the scroll unit 1
2 is a first scroll part 12a and a second scroll part 12b.
However, the spiral scroll portion 12 may be formed so as to be simply formed into a half-split shape without being divided into the first scroll portion 12a and the second scroll portion 12b.

In the above embodiments, the enlarged diameter portion 21 is formed at the end of the second scroll portion 12b.
May be omitted. Further, a reduced diameter portion may be formed at the end of the first scroll portion 12a, a reduced diameter portion may be formed at the end of the second scroll portion 12b instead of the enlarged diameter portion 21, or the first scroll portion may be formed. An enlarged diameter portion may be formed at the end of 12a.

The SUS meshes 14 and 25 in the first embodiment may be omitted. Also,
The SUS mesh 53 in the second embodiment may be omitted.

In the above embodiments, the flange 1
The ridges 28 and 55 are formed on the ridges 7 and 52.
It is good also as composition which omits 8, 55.

In the turbine housings 11 and 51 of the above embodiments, a stainless steel material having excellent heat resistance and corrosion resistance is used, but is not particularly limited to the stainless steel material.

[0096] In addition, technical ideas that are not described in the claims but are understood from the above embodiments and the like are described below together with their effects.

(A) The turbine housing for a turbocharger according to claim 4, wherein a metal mesh is interposed between said scroll portion and said cover portion.

According to the invention described in the above (a), in addition to the effect of the invention described in the fourth aspect, a metal mesh
For example, noise such as vibration noise caused by rotation of the turbine can be absorbed and reduced to suppress it. Further, the gap between the scroll portion and the cover portion can be reliably held by the interposition of the metal mesh.

[0099]

According to the first aspect of the present invention, it is possible to automatically adjust the flow rate of the exhaust gas flowing through the scroll portion and maintain a good state without using a waste gate valve or the like. it can. In addition, since the flow rate of the exhaust gas flowing through the scroll portion can be adjusted, the wastegate valve and the wastegate port used in the related art become unnecessary, and the size and weight of the turbine housing and, consequently, the turbocharger can be reduced. Can be planned. in addition,
By eliminating the need for a wastegate valve and wastegate port in the turbine housing of the turbocharger,
The design flexibility of the turbine housing can be increased. Also,
Since the thermal energy of the exhaust gas can be effectively used, it is possible to shorten the time required to reach the activation temperature of the catalyst disposed downstream of the turbine housing immediately after the start of the engine of the vehicle.

According to the invention of claim 2, according to claim 1,
In addition to the effects of the invention described in the above, the first scroll portion and the second scroll portion can be slid by the enlarged diameter portion or the reduced diameter portion formed on at least one of the first scroll portion and the second scroll portion. When the fitting is performed by the, the fitting operation can be performed easily and reliably.
Further, the fitting portion between the first scroll portion and the second scroll portion can be easily slid by the enlarged diameter portion or the reduced diameter portion.

According to the third aspect of the invention, in addition to the effects of the first and second aspects of the present invention, at least one of the first scroll portion and the second scroll portion and the cover portion are provided. The intervening metal mesh can absorb and mitigate noise such as vibration noise caused by rotation of the turbine, for example. Further, the gap between at least one of the first scroll portion and the second scroll portion and the cover portion can be reliably held by the interposition of the metal mesh.

According to the fourth aspect of the present invention, the first aspect is provided.
The effects similar to the effects of the invention described in (1) can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a turbine housing according to a first embodiment of the present invention, and is a sectional view of FIG.
-B line sectional drawing.

FIG. 2 is an enlarged sectional view showing a part of a scroll part and a cover part.

FIG. 3 is a front view showing the turbine housing according to the first embodiment.

FIG. 4 is a vertical sectional view showing the turbine housing according to the first embodiment, and is a sectional view taken along line CC of FIG. 5;

FIG. 5 is a side view showing the turbine housing according to the first embodiment.

FIG. 6 is a rear view showing the turbine housing according to the first embodiment.

FIG. 7 is a side view showing the turbine housing according to the first embodiment.

FIG. 8 is a cross-sectional view showing a turbine housing according to a second embodiment.

FIG. 9 is a front view showing a turbine housing according to the related art.

FIG. 10 is a rear view showing a turbine housing according to the related art.

11 is a cross-sectional view showing a turbine housing according to the related art, and is a cross-sectional view taken along line AA of FIG. 9;

[Explanation of symbols]

 11, 51 Turbine housing 12 Scroll part 12a First scroll part 12b Second scroll part 12c, 12d, 12e Half part 13 Cover part 13a First cover part 13b Second cover part 14, 25, 53 SUS mesh 15, 16, 17, 52 Flange part 18 Turbine blade 19 Turbine 20 Slide part 21 Large diameter part

Claims (4)

[Claims] A metal scroll portion forming a spiral exhaust gas flow path; a metal cover portion enclosing the scroll portion with a gap; and a scroll portion and the cover portion. A supercharger turbine housing including a metal flange portion to be attached and a turbine housed therein, wherein the scroll portion is divided into a first scroll portion and a second scroll portion, and the scroll portion is divided and formed. At least one of the first scroll portion and the second scroll portion is formed so as to be further divided into half-shapes, and the half-split portions formed so as to be slidably combined with each other so as to be openable and closable. A turbine housing for a turbocharger, wherein a first scroll portion and a second scroll portion are fitted in a slidable state. 2. A diameter increasing portion or a diameter decreasing portion is formed on at least one of a portion in which the first scroll portion and the second scroll portion are slidably fitted to each other. 2. The turbine housing of the turbocharger according to 1. 3. The supercharger according to claim 1, wherein a metal mesh is interposed between at least one of the first scroll part and the second scroll part and the cover part. Machine turbine housing. 4. A metal scroll part forming a spiral exhaust gas flow path, a metal cover part enclosing the scroll part with a gap, and the scroll part and the cover part A turbine housing of a turbocharger having a metal flange portion to be attached and a turbine housed therein, wherein the scroll portion is formed so as to be divided in a half-shape, and the scroll portion is formed in a half-shape. A turbine housing for a turbocharger, wherein the turbine housings can be opened and closed by combining them in a slidable state.