JPH07189723A - Turbocharger - Google Patents

Abstract

PURPOSE:To improve sealing performance between a turbine housing and a bearing housing by interposing a gasket between a fitting flange and the end face of the turbine housing. CONSTITUTION:In the case of fitting a fitting flange 6, formed at a bearing housing 4, to the end face 8 of a turbine housing 1 by a bolt 7, a gasket 11 is interposed between the fitting flange 6 and the end face 8. Sealing performance is thereby improved, and gas leakage preventing effect can be heightened.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a turbocharger.

[0002]

2. Description of the Related Art A turbocharger is one in which a turbine and a compressor are connected on the same rotary shaft, and the compressor is driven by the turbine.

FIG. 9 is a sectional view of a turbine portion of a turbocharger, in which 1 is a turbine housing of the turbocharger, 2 is a turbine impeller rotatably disposed inside the turbine housing 1, and 3 is a turbine. A rotary shaft that connects the impeller 2 and a compressor impeller of a compressor (not shown), a bearing housing that holds the rotary shaft 3 via a bearing 5, and a mounting flange 6 that is formed in the bearing housing 4 for mounting the turbine housing 1. Reference numeral 7 denotes a bolt that fastens between the mounting flange 6 and the compressor-side end surface 8 of the turbine housing 1.

Reference numeral 9 is a heat shield plate interposed between the turbine housing 1 and the bearing housing 4, and 10 is a heat insulating space formed between the heat shield plate 9 and the bearing housing 4.

In the above turbocharger, the mounting flange 6 formed on the turbine housing 1 and the end surface 8 of the turbine housing 1 are directly fastened with bolts 7 so that a seal between the two is achieved.

[0006]

However, the conventional turbocharger described above has the following problems.

That is, the mounting flange 6 formed on the bearing housing 4 and the end surface 8 of the turbine housing 1 are directly fastened with the bolts 7 to seal the bearing housing 4 and the turbine housing 1. However, since the turbocharger becomes hot during operation, thermal deformation of the turbine housing 1 and the bearing housing 4 may cause a gap between the mounting flange 6 and the end surface 8 to cause gas leakage.

In view of the above situation, it is an object of the present invention to provide a turbocharger capable of improving the sealability between the turbine housing and the bearing housing.

[0009]

SUMMARY OF THE INVENTION The present invention is a turbocharger in which a mounting flange formed on a bearing housing and an end surface of a turbine housing are bolted to each other, and a gasket is provided between the mounting flange and the end surface. It relates to a turbocharger characterized by being interposed.

In this case, one bead that extends in the circumferential direction is formed along the outer edge of the gasket, and one bead that extends in the circumferential direction is formed along the inner edge of the gasket. A loop-shaped single bead may be formed at a position between the single beads and a position between the adjacent bolt holes.

Alternatively, a single bead extending in the circumferential direction along the outer edge of the gasket is formed, a single bead is formed around each bolt hole of the gasket, and the outer edge portion between bolts located between the bolt holes is fixed to each bolt hole. The diameter may be the same as or smaller than the center circle of the bolt passing through the center of the hole.

Further, according to the present invention, in a turbocharger in which a mounting flange formed on a bearing housing and an end surface of a turbine housing are bolted together, a non-space between the mounting flange and the end surface on the outer edge side thereof. The present invention relates to a turbocharger characterized by forming a contact space and forming a contact surface on the inner edge side between the mounting flange and the end surface for contacting both.

[0013]

The operation of the present invention is as follows.

When the mounting flange formed on the bearing housing and the end surface of the turbine housing are bolted together, a gasket is interposed between the mounting flange and the end surface to improve the sealing performance and prevent gas leakage. Can be increased.

At this time, double-sided single beads extending in the circumferential direction along the outer edge portion and the inner edge portion of the gasket are formed, and further, at positions between the bead portions of the inner and outer edge portions of the gasket and between adjacent bolt holes. By forming the loop-shaped single bead at the position, the same state as when the double full bead is formed on the gasket is obtained, and a high sealing property is obtained.

Alternatively, by forming one bead extending in the circumferential direction along the outer edge of the gasket, the one bead having a high deformability can follow the thermal deformation of the mounting flange and the end face, and can be positioned between the bolt holes. To reduce the heat transfer to the bearing housing by reducing the contact area between the turbine housing and the bearing housing by forming the outer edge portion between the bolts that is the same as or smaller than the center circle of the bolt passing through the center of each bolt hole. You can

Further, when the mounting flange formed on the bearing housing and the end surface of the turbine housing are bolted together, a non-contact space is formed on the outer edge side of the mounting flange and the end surface so as to separate them from each other, and the mounting flange is also formed. By forming a contact surface on the inner edge side between the contact surface and the end surface, the contact pressure between the both is increased and high sealing performance can be obtained, and the contact area between the both is reduced to reduce the bearing housing. The heat transfer to can be reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention.

In the figure, 1 is a turbine housing of a turbocharger, 2 is a turbine impeller rotatably disposed inside the turbine housing 1, and 3 is a rotating shaft connecting a turbine impeller 2 and a compressor impeller of a compressor (not shown). Reference numeral 4 denotes a bearing housing that holds the rotating shaft 3 via a bearing 5, 6 denotes a mounting flange for mounting the turbine housing 1 formed on the bearing housing 4, 7 denotes the mounting flange 6 and an end surface 8 of the turbine housing 1 on the compressor side. It is a bolt that fastens between and.

Further, 9 is a heat shield plate interposed between the turbine housing 1 and the bearing housing 4, and 10 is a heat insulating space formed between the heat shield plate 9 and the bearing housing 4.

In the present invention, the gasket 11 is interposed between the mounting flange 6 of the bearing housing 4 and the end surface 8 of the turbine housing 1.

The gasket 11 has a shape as shown in FIGS.

That is, the gasket 11 has a single bead 13 (one step) extending in the circumferential direction 12 along the outer edge portion and a single bead 14 extending in the circumferential direction 12 along the inner edge portion. A loop-shaped bead 16 is formed at a position between the edge beads 13 and 14 and at a position between adjacent bolt holes 15 and 15.

Next, the operation will be described.

In the present invention, even when the turbocharger becomes hot during operation and the turbine housing 1 and the bearing housing 4 are thermally deformed, the gasket 11 elastically follows the deformation, whereby the mounting flange 6 and the end surface 8 are formed. A gap is prevented from being formed between the
It is possible to prevent gas leakage.

Moreover, the double-sided beads 13 are formed on the inner and outer edges.
By forming 14, a double sealing effect can be obtained.

In the gasket 11, the bolt fastening force applied to the intermediate portion between the bolts 7 and 7 is smaller than that to the fastening portion of the bolt 7, but the loop-shaped single bead 16 is applied to this portion.
By forming the outer bead 13 on the outer edge portion and the outer edge side portion of the loop-shaped one bead 16, and between the one bead 14 on the inner edge portion and the inner edge-side portion of the loop-shaped one bead 16 Since a high full bead (both steps) is formed in double, a good sealing property is secured even in the intermediate portion between the bolts 7, 7.

FIGS. 5 to 7 show a second embodiment of the present invention in which a gasket 11 is provided with a single bead 17 extending in the circumferential direction 12 along the outer edge portion, and a single bead 17 is provided around each bolt hole 15. The bead 18 is formed, and the bolt-to-bolt outer edge portion 19 at the intermediate portion between the bolt holes 15 and 15 is formed in each bolt hole 15.
The structure is the same as that of the above-described embodiment except that the bolt has a diameter equal to or smaller than that of the bolt center circle 20 passing through the center of the bolt, and the same action and effect can be obtained.

Moreover, although the single bead 17 is formed along the outer edge of the gasket 11, the single bead 17 has a higher deformability than the full bead (both steps), so that the bolt 7, which is difficult to tighten the bolt 7, A sufficient sealability is obtained even in the middle portion between the seven, and even when the mounting flange 6 of the bearing housing 4 and the end surface 8 of the turbine housing 1 are largely deformed, a high gas leakage prevention effect is obtained following the deformation. Obtainable.

Further, since a high gas leakage preventing effect can be obtained, the width dimension of the intermediate portion between the bolts 7 of the gasket 11 is made small so that the outer edge portion 19 between the bolts has the bolt center circle 2.
The diameter may be the same as or smaller than 0.

By thus reducing the outer diameter portion 19 between the bolts, it is possible to reduce the contact area between the turbine housing 1 and the bearing housing 4, that is, the heat transfer area. It is possible to prevent the temperature from rising.

FIG. 8 shows a third embodiment of the present invention in which a non-contact space 21 is formed on the outer edge side of the mounting flange 6 of the bearing housing 4 and the end surface 8 of the turbine housing 1 so as to separate them from each other. Except that a contact surface 22 is formed on the inner edge side of the mounting flange 6 and the end surface 8 to contact them,
It has the same structure as the above-mentioned embodiment.

In this embodiment, the contact surface 22 is formed only on the inner edge side of the mounting flange 6 of the bearing housing 4 and the end surface 8 of the turbine housing 1, so that the surface pressure between them can be increased. As a result, it is possible to obtain a higher sealing property than in the case where the mounting flange 6 and the entire end surface 8 are brought into contact with each other for sealing.

Further, by forming a contact surface 22 on the inner edge side between the mounting flange 6 and the end surface 8 only, the contact area between them is reduced, that is, the heat transfer area between the turbine housing 1 and the bearing housing 4 is reduced. It is possible to prevent the temperature rise of the bearing housing 4 by that amount.

Further, since the non-contact space 21 is formed on the outer edge side of the mounting flange 6 and the end face 8 so as to separate them from each other, the elasticity of the mounting flange 6 is increased, so that the bolt 7 extends due to thermal expansion due to high temperature. Even when the bolt 7 is broken, the bolt 7 can be prevented from loosening.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0038]

As described above, according to the turbocharger of the present invention, the excellent effect that the sealability between the turbine housing and the bearing housing can be improved can be obtained.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a first embodiment of the present invention.

FIG. 2 is a plan view of a gasket.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a plan view of a gasket according to a second embodiment of the present invention.

6 is a VI-VI arrow view of FIG.

7 is a view taken along arrow VII-VII in FIG.

FIG. 8 is a partial sectional view of a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of a turbine portion of a conventional example.

[Explanation of symbols]

 1 Turbine housing 4 Bearing housing 6 Mounting flange 7 Bolt 8 End face 11 Gasket 12 Circumferential direction 13, 14, 16-18 Single bead 15 Bolt hole 19 Outer edge portion between bolts 20 Bolt center circle 21 Non-contact space 22 Contact surface

Claims (4)

[Claims] 1. A turbocharger in which a mounting flange formed on a bearing housing and an end surface of a turbine housing are bolted together, wherein a gasket is interposed between the mounting flange and the end surface. Turbocharger. 2. A single bead extending in the circumferential direction along the outer edge of the gasket and a single bead extending in the circumferential direction along the inner edge of the gasket are formed. Further, the single bead at the inner and outer edge portions of the gasket is formed. A loop-shaped single bead is formed at a position between and between adjacent bolt holes.
The listed turbocharger. 3. A bead extending circumferentially along the outer edge of the gasket is formed to form a bead around each bolt hole of the gasket, and an outer edge portion between bolts located between the bolt holes is formed at each bolt. The turbocharger according to claim 1, wherein the turbocharger is formed to have a diameter equal to or smaller than the center circle of the bolt passing through the center of the hole. 4. A turbocharger in which a mounting flange formed on a bearing housing and an end surface of a turbine housing are bolted to each other, and a non-contact space is formed on an outer edge side of the mounting flange and the end surface so as to separate them from each other. In addition, the turbocharger is characterized in that a contact surface is formed on the inner edge side of the mounting flange and the end surface for contacting both.