JPH11280907A - Gasket for turbocharger mounting flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing ability and durability. SOLUTION: A gasket interposed between the flanges of an exhaust manifold and a turbocharger comprises a stopper plate 10 having a prescribed length folded part 16 formed on the inner edge side to cover an opening, and a pair of action plates 11a and 11b which have inner peripheral end sides nipped by the folded part 16 of the stopper plate 10 and between which a center plate 12 is interposed except the nipped portions of the action plates. Bead parts 15 symmetrically expanding are formed in positions separated from each other outward by a prescribed distance from the nipping parts of the action plates 11a and 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gasket for a turbocharger mounting flange.

[0002]

2. Description of the Related Art When a turbocharger is mounted on an exhaust manifold of an engine, a gasket is interposed between flanges thereof.

[0003] As such a gasket, a gasket formed by laminating several thin plates of stainless steel or the like is used. In this case, the opening side through which the exhaust gas passes is folded back from the top plate. The inner peripheral end of the other plate is formed so as to sandwich and cover the inner peripheral end, and the inner peripheral end is cut between predetermined plates at the outer peripheral portion so that the thickness is almost the same as the folded portion. A chipped plate is provided (see Japanese Patent Application Laid-Open No. 8-144449).

[0004]

However, such a conventional gasket has a structure in which flat plates are overlapped with each other, so that, for example, the flange surface of the exhaust manifold or the turbocharger is warped for a long time. When it comes, there is a concern that the sealing property may deteriorate.

That is, in such a structure, the sealing is performed by pressing the flange surface almost uniformly, but when the flange surface is warped, for example, the gasket is partially removed even if it does not separate from the flange surface. The pressing force is greatly reduced, which may deteriorate the sealing performance.

[0006] In addition, such a gasket, when used once, causes the plate to be deformed, and therefore needs to be replaced every one or two maintenances.

An object of the present invention is to solve such a problem.

[0008]

According to a first aspect of the present invention, there is provided a gasket interposed between a flange of an exhaust manifold and a turbocharger, wherein a stopper of a predetermined length is formed on an inner edge side surrounding an opening. A plate, and a pair of action plates having an inner peripheral end sandwiched by a folded portion of the stopper plate and a center plate interposed therebetween except for the sandwiched portion. A symmetrically bulging bead portion is formed at a position separated from the part by a predetermined outward direction.

According to a second aspect of the present invention, in the first aspect, the bead portion of the action plate has a bead height and a bead such that the bead portion of the action plate is pressed against the stopper plate and the flange within a range of elastic deformation when fixed between the flanges. Set the width.

In a third aspect based on the first aspect, the center plate has a smaller thickness than the stopper plate.

[0011]

According to the first and second aspects of the present invention, it is assumed that the pressure contact force at the folded portion of the stopper plate is reduced due to the warpage of the flange surface of the exhaust manifold or the turbocharger, and the sealing at that portion is deteriorated. Also, the bead part of the action plate on the outside and the stopper plate in contact with the bead part of the action plate are pressed against the flange surface by the elastic force of the bead part, and double sealing is performed, ensuring a good sealing state Therefore, high reliability is obtained.

In addition, the bead portion is not permanently deformed by use, so that a high durability of the gasket is obtained, a replacement period is lengthened, and a maintenance cost is reduced.

According to the third aspect of the invention, the double seal structure can be accurately obtained during normal use.

[0014]

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

As shown in FIG. 1 and FIG.
Thin stainless steel plates 10, 11a, 11b,
12 are formed.

Action plate 11 provided in a pair
In steps a and 11b, a slight step 14 is formed at a position outside a predetermined distance from the inner peripheral end on the opening 13 side, and the inner peripheral end is aligned, and the plate 11a extends outward from the step 14. , 11b.

The center plate 12 has a smaller thickness than the stopper plate 10.

An arc-shaped bead portion 15 is formed symmetrically at a position away from the step 14 of the action plates 11a and 11b by a predetermined distance. The bead portion 15 has a bead width (e.g., 3...) That is fixed between the flanges of the exhaust manifold and the turbocharger so as not to cause permanent deformation, that is, to be pressed against within a range of elastic deformation. 0 mm ≦ 〜 ≦ 10 mm) and a bead height (for example, 0.1 mm ≦ ｍｍ ≦ 0.3 mm) are set. A predetermined heat treatment is applied to the action plates 11a and 11b.

The stopper plate 10 has action plates 11a and 11b with a center plate 12 interposed therebetween.
Are overlapped, the inner edge side surrounding the opening 13 is folded back to a predetermined length, and the inner peripheral end sides of the action plates 11a and 11b are sandwiched and held by the folded-back portion 16.

The plates 10, 11a, 11b, 1
The outer peripheral shape of 2 is the same as the flange shape of the turbocharger. At predetermined positions such as four corners of the gasket, through holes 17 for mounting bolts are provided.

Note that spot welding is previously performed between the center plate 12 and one of the action plates 11a and 11b at two symmetrical positions (for example, near the through hole 17).

When such a gasket is fixed between the flanges of the exhaust manifold and the turbocharger, at least the folded portion 16 of the stopper plate 10 and the action plate 1 outside thereof are fixed.
1a bead portion 15 and action plate 11b
The stopper plate 10 which is in contact with the bead portion 15 is pressed against the flange surface to perform double sealing.

Therefore, even if the flange surface of the exhaust manifold or the turbocharger warps for a long time, a good sealing state is maintained. In other words, even if the pressing force of the folded portion 16 of the stopper plate 10 is reduced due to the warpage of the flange surface and the sealing at that portion is deteriorated, the bead portion 1 of the action plate 11a on the outer side thereof is deteriorated.
5 and the stopper plate 10 in contact with the bead portion 15 of the action plate 11b, a predetermined pressure contact force is maintained by the elastic force of the bead portion 15, and a good sealing state is ensured.

Therefore, the exhaust gas does not leak from the seal portion, and high reliability can be obtained.

The use of the stopper plate 10
Is deformed, the bead portions 15 of the action plates 11a and 11b are pressed against each other within the range of elastic deformation, so that the bead portions 15 are not deformed. Therefore, high durability of the gasket is obtained. There is no need to replace the battery every two maintenances, which reduces maintenance costs. Further, since the pressing force is maintained by the elastic force of the bead portion 15, the thickness of the gasket does not need to be increased, and the cost is reduced.

Since the center plate 12 is thinner than the stopper plate 10, the folded portion 16 of the stopper plate 10 is securely pressed against the flange surface under the condition that the flange surface is not warped, so that the double sealing is accurately performed. The structure is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment.

FIG. 2 is a sectional view taken along the line AA.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stopper plate 11a, 11b Action plate 12 Center plate 13 Opening 14 Step 15 Bead part 16 Folding part 17 Through hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Kaneko 6-12 Yawata, Kawashima-cho, Hiki-gun, Saitama Prefecture Tokyo Gasket Industry Co., Ltd.

Claims (3)

[Claims] In a gasket interposed between a flange of an exhaust manifold and a turbocharger, a stopper plate having a predetermined length of folded portion formed on an inner edge side surrounding an opening, and a folded portion of the stopper plate. The inner peripheral end side is clamped, and except for the clamping portion,
A pair of action plates having a center plate interposed therebetween, and a symmetrically bulging bead portion is formed at a position of the action plates spaced outward from the clamping portion by a predetermined distance. Gasket for turbocharger mounting flange. 2. A bead portion of the action plate,
The gasket for a turbocharger mounting flange according to claim 1, wherein the bead height and the bead width are set so as to press against the stopper plate and the flange in a range of elastic deformation while being fixed between the flanges. 3. The gasket for a turbocharger mounting flange according to claim 1, wherein the center plate has a smaller thickness than a stopper plate.