JP3275237B2 - Wastegate for turbocharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastegate mounting mechanism for releasing an excessive exhaust of a supercharger which rotates an exhaust turbine by exhaust gas of an internal combustion engine and supplies intake air compressed by a charger.

[0002]

2. Description of the Related Art Conventionally, in a supercharger of an internal combustion engine, a technique of providing a waste gate at a portion of a supercharger mount is known. For example, Japanese Utility Model Publication No. 56-171
634, for example.

[0003]

The supercharger introduces exhaust gas from an internal combustion engine into an exhaust turbine, obtains high-speed rotation, rotates a charger, and sends excess air into a combustion chamber by the charger. . However, in some cases, more exhaust gas than is required to rotate the exhaust turbine is supplied to the exhaust turbine. In this case, it is the waste gate that releases excess exhaust gas in the bypass direction. In this turbocharger with a wastegate, the deformation due to heat around the wastegate is large. Conventionally, an expansion joint is interposed between the exhaust turbine and the wastegate to allow a difference in the amount of thermal deformation between the two. It was configured to. However, because the shape of this expansion joint itself is large,
Piping in a small space was impossible. In addition, due to the increase in the number of parts, the supercharger with the waste gate has been complicated and expensive.

Conventionally, the exhaust gas from the exhaust turbine and the exhaust gas from the wastegate are combined at the exhaust vent. However, since the energy of the exhaust gas from the wastegate is large, the exhaust gas is exhausted. This affected the exhaust gases from the turbine, which reduced the performance of the turbocharger.

Further, conventionally, a wastegate is attached to a supercharger mounting base. However, the wastegate is liable to generate vibration, and a bracket for mounting the wastegate on the supercharger mounting base is rigid. If this part is made rugged, it is necessary to interpose a large one such as a bellows pipe between the turbocharger mounting base and the waste gate due to the difference in the amount of thermal deformation. It is. In the present invention, the wastegate is directly supported by the exhaust manifold via the wastegate support, and an exhaust passage is opened in the wastegate support, so that a sufficient space is provided between the supercharger mount and the wastegate. It is possible to hold the sheet while obtaining a contact area.

[0006]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In a configuration in which a supercharger mounting base 2 for fixing an exhaust turbine 3 of a supercharger is provided on an exhaust manifold 1 of an internal combustion engine, and a waste gate 4 is provided on the supercharger mounting base 2, A wastegate support 6 interposed between the table 2 and the wastegate 4 is provided, and an exhaust passage 6a is formed in the wastegate support 6.

[0009]

Next, the operation will be described. Since the exhaust passage 6a is formed inside the waste gate support 6, the attachment of the waste gate support 6 and the waste gate 4 can be sufficiently provided around the exhaust passage 6a, and the exhaust gas is not obstructed. There is nothing to do.

[0012]

Next, an embodiment will be described. FIG. 1 is a plan view of an engine having a supercharger with a waste gate, and FIG. 2 is an exhaust manifold 1, a supercharger mount 2, and an exhaust turbine 3.
FIG. 3 is a front view of FIG. 2, and FIG. 4 is an enlarged side view of the supercharger mount 2, the exhaust turbine 3, and the waste gate 4. 5, FIG. 5 is a front view of the exhaust vent 5, FIG. 6 is a plan view of the same exhaust vent 5, FIG. 7 is a side view of the same exhaust vent 5, FIG. 8 is a sectional view taken along the line DD in FIG. 8, FIG. 10 is a sectional view taken along the line BB in FIG. 7, FIG. 11 is a plan view of a gasket between the exhaust manifold 1 and the supercharger mount 2, and FIG. FIG. 13 is a plan view of a gasket between the feeder mount 2 and the waste gate 4, FIG. 13 is a plan view of the waste gate support 6, and FIG. 14 is an enlarged sectional view of the gasket.

A description will be given with reference to FIGS. 1, 2 and 3. Exhaust manifold 1 at the side of cylinder head of internal combustion engine
Is arranged. Exhaust gas is collected by the exhaust manifold 1, and high-pressure exhaust gas is supplied to an exhaust turbine 3 mounted on the supercharger mount 2 via a gas passage in the supercharger mount 2. The high-pressure exhaust gas makes the exhaust turbine 3
Is rotated, the rotation transmits the rotation to the charger 9, and the intake air is supplied to the intake manifold in a pressurized state.

When supplying exhaust gas from the exhaust manifold 1 to the exhaust turbine 3 via the supercharger mount 2, when more exhaust gas than the exhaust turbine 3 requires is discharged from the internal combustion engine, The waste gate 4 for opening the bypass is provided. In this embodiment , the waste gate 4 is interposed between the supercharger mount 2 and the exhaust vent 5. The exhaust vent 5 is fixed on the side of the exhaust turbine 3 opposite to the charger 9.
This is the part where the exhaust gas is discharged, supplied to the exhaust pipe and released to the atmosphere. Unnecessary exhaust gas ejected from the waste gate 4 through the bypass toward the exhaust vent 5 is merged.

As shown in FIGS. 2, 3 and 4,
Fix the turbocharger mounting base 2 to the exhaust manifold 1,
An exhaust vent 5 is fixed to the turbocharger mount 2, and a wastegate 4 is fixed between the turbocharger mount 2 and the exhaust vent 5, and the wastegate 4 further has a wastegate support 6 shown in FIG. Is interposed between the supercharger mounting base 2 and the waste gate 4, and the other end of the waste gate support 6 is fixed to a side surface of the exhaust manifold 1.

As described above, the exhaust manifold 1, the supercharger mount 2, the exhaust turbine 3, the wastegate 4, and the exhaust vent 5 are fixed to each other as a frame structure. Then, the exhaust gas passes through all the frame components. However, since the temperature of the exhaust manifold 1 is the highest, the temperature of each portion is different, and the material, heat capacity, and mass of each device are different. The degree of thermal deformation is different. Since the five members having different amounts of thermal deformation have a frame structure, unless a portion absorbing the amount of thermal deformation is provided, a crack is formed from a portion having the weakest strength. For this purpose, as shown in FIG. 14, a flexible gasket is interposed in each connecting portion.

The portion where the flexible gasket is interposed is a gasket 11 between the turbocharger mount 2 and the exhaust turbine 3.
And gasket 1 between exhaust turbine 3 and exhaust vent 5
4, a gasket 12 between the supercharger mount 2 and the wastegate 4, and a gasket 13 between the wastegate 4 and the exhaust vent 5. These gaskets 1
1 ・ 12 ・ 13 ・ 14 are three plates 15 ・ 16 ・
17 and the three plates 15
Since the deformable concave portion a is formed between 16 and 17, even if there is a difference in the deformation rate between each exhaust manifold 1, the supercharger mount 2, the exhaust turbine 3, and the wastegate 4, The deformable recess a can absorb this.

FIG. 11 shows the shape of the gasket 11 between the turbocharger mount 2 and the exhaust turbine 3, and FIG. 14 is a sectional view taken along the line II--II of FIG. . FIG.
The supercharger mounting base 2 and the waste gate 4 are shown in FIG.
FIG. 3 is a drawing of the gasket 12 between FIG.

Next, the waste gate support 6 shown in FIG. 13 will be described. The wastegate support 6 is sandwiched between the supercharger mounting base 2 and the exhaust turbine 3, and the wastegate support 6 is connected to the exhaust passage 6.
a, which constitutes a throttle, and further forms a throttle valve. When the waste gate 4 is opened against this throttle valve, it is regarded as excessive exhaust gas. , The exhaust gas does not pass through the exhaust turbine 3,
It is bypassed directly to the exhaust vent 5.

Next, FIGS. 5 to 10 disclose the configuration of the partition wall 18 at the junction of the exhaust gas from the exhaust turbine 3 and the exhaust gas from the waste gate 4 at the exhaust vent 5. In the exhaust vent 5, a portion of the bracket 22 is a portion fixed to an exhaust port of the exhaust turbine 3, and a portion of the bracket 22 is a portion to which an exhaust pipe is connected. In the present embodiment , a partition wall 18 is provided in a portion of the exhaust passage 25 inside the exhaust vent 5 corresponding to a portion of the bracket 24 which is a portion connected to the waste gate 4, and the exhaust gas from the waste gate 4 is , So that the exhaust gas from the exhaust turbine 3 smoothly merges.

With the above configuration, the internal combustion
The turbocharger exhaust turbine 3 is installed in the exhaust manifold 1 of the engine.
A turbocharger mounting base 2 to be fixed is provided.
In the configuration in which the waste gate 4 is provided,
The thermal deformation around the gate 4 is measured by the supercharger mount 2 and the exhaust turbine.
Between the turbocharger mounting base 2 and the wastegate 4
Absorb by inserting multiple gaskets between
Therefore, the exhaust manifold 1 fixed to the frame structure
Supercharger mount 2, exhaust turbine 3, waste gate 4
The difference in the amount of thermal deformation generated between the exhaust vent 5 and
Can be absorbed by the gasket at the location, weak strength
To prevent cracks from occurring
You.

The exhaust gas from the turbocharger side and the way
Exhaust gas that constitutes the junction of exhaust gas from the side of the gate 4
In the vent 5, a partition wall 18 for preventing interference between both exhaust gases
The exhaust gas from the waste gate 4
Because the energy is too large, the exhaust gas from the turbocharger
Fixed the problem that the performance of turbocharger was deteriorated due to interference
I was able to do it. Also avoid the interference
Therefore, in the method of merging at a place away from the turbocharger,
Is complicated and dimensionally large.
We were able to eliminate it.

[0021]

As described above, the present invention has the following advantages. That is, as in claim 1
In addition , the wastegate support 6 interposed between the turbocharger mounting base 2 and the wastegate 4 is provided, and the wastegate support 6 is provided with an exhaust passage 6a. Since the load caused by the vibration of the gate 4 and its own weight can be received by the waste gate support 6, the load can be reduced. Also,
The shape of the supercharger mounting base 2 can be reduced, so that the exhaust manifold 1 and the supercharger can be easily mounted. Further, since the turbocharger mount 2 and the wastegate 4 can be made compact, the entire internal combustion engine can be made compact. In addition , since the exhaust passage 6a is formed inside the waste gate support 6, the attachment of the waste gate support 6 and the waste gate 4 is reduced by the exhaust passage 6a.
around a can sufficiently provided, One or is have no disturbing the discharge of exhaust gases.

[Brief description of the drawings]

FIG. 1 is a plan view of an engine provided with a supercharger having a waste gate.

FIG. 2 is a plan view showing an exhaust manifold 1, a supercharger mount 2, an exhaust turbine 3, a waste gate 4, and an exhaust vent 5.

FIG. 3 is a front view of the portion of FIG. 2;

FIG. 4 is an enlarged side view of the supercharger mount 2, the exhaust turbine 3, and the waste gate 4.

FIG. 5 is a front view of an exhaust vent 5;

FIG. 6 is a plan view of the exhaust vent 5;

FIG. 7 is a side view of the exhaust vent 5;

FIG. 8 is a sectional view taken along the line DD in FIG. 5;

FIG. 9 is a sectional view taken along the line AA in FIG. 8;

FIG. 10 is a sectional view taken along the line BB in FIG. 7;

FIG. 11 is a plan view of a gasket between the exhaust manifold 1 and the supercharger mount 2.

FIG. 12 is a plan view of a gasket between the supercharger mounting base 2 and the waste gate 4.

13 is a plan view of the waste gate support 6. FIG.

FIG. 14 is an enlarged sectional view of a gasket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust manifold 2 Turbocharger mount 3 Exhaust turbine 4 Wastegate 5 Exhaust vent 6 Wastegate support 9 Charger 11, 12, 13, 14 Gasket 18 Partition wall

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02B 37/18 F02B 37/00 F01N 7/14

Claims (1)

(57) [Claims] An exhaust manifold (1) of an internal combustion engine is provided with a supercharger mount (2) for fixing an exhaust turbine (3) of a supercharger, and a wastegate (2) is provided on the supercharger mount (2). In the configuration provided with 4), a wastegate support (6) interposed between the turbocharger mounting base (2) and the wastegate (4) is provided, and the wastegate support (6) is provided with an exhaust passage (6a). ). A wastegate for a turbocharger characterized by drilling