KR100267479B1 - Gasket of metal loading type - Google Patents

Abstract

A gasket having a well-balanced surface pressure distribution. In the said gasket, the 1st plate 1 of the gasket base material A which consists of the 1st plate 1 and the 2nd plate 2 does not overlap with the 2nd plate 2 toward the 2nd plate 2 side. The folding part 4 which folds and comprises the cylinder hole 3 is formed. The metal ring 6 surrounding the cylinder hole 3 is installed between the folded piece 5 of the folded part 4 and the first plate 1. A wide portion 6a protruding from the folded portion 4 of the metal ring 6 is interposed between the first plate 1 and the second plate 2.

Description

Metal Stacked Gaskets

The present invention relates to a metal laminated gasket used to intervene between a cylinder block and a cylinder head fastened to each other with fastening bolts to prevent leakage of combustion gas between the block and the head.

Without giving a specific example, the metal laminated gasket used for an internal combustion engine has been proposed the gasket of various structure, among which, a gasket consists of a pair of 1st and 2nd plates, and the 1st plate is removed. There is a gasket having a structure in which a folded portion constituting a cylinder hole is folded back to the plate side, and a metal ring surrounding the cylinder hole is provided in the folded portion.

In the conventional example, the metal ring is stored and installed in the folded portion, and the folded portion is made relatively thick in comparison with other portions to generate the seal surface pressure and to exhibit the gasket original sealing function. Since each part is composed of the same width over the entire circumference, the vicinity of the fastening bolt and the gasket part, in the vicinity of the bolt hole, receives a strong tightening load of the bolt, which inevitably generates more seal surface pressure than necessary. Since the seal surface pressure decreases by this much and the balance of surface pressure distribution is lacking as a whole, it becomes the cause of the leakage of combustion gas.

1 is a partial cutaway front view of the present invention.

2 is a cross-sectional view taken along the line a-a of FIG.

3 is a cross-sectional view taken along the line b-b of FIG.

* Explanation of symbols for main parts of the drawings

1: first plate 2: second plate

3: cylinder hole 4: folded part

5: folded back 6: metal ring

The present invention has been invented as one of means for solving such a problem.

The first plate of the gasket base material consisting of the first plate and the second plate is folded back to the second plate so as not to overlap with the second plate, thereby forming a folded part forming a cylinder hole. The metal ring surrounding the cylinder hole is refurbished between the folding piece and the first plate, and is closer to the bolt hole than the other part of the metal ring to protrude from the folding part. It is assumed that the wide portion is interposed between the first and second plates as a basic means.

Further, by providing a bead surrounding the metal ring on the second plate, it is possible to provide a metal laminated gasket in which the bead exhibits a secondary seal function and performs a more reliable gas seal.

EXAMPLE

Figure 1 shows an embodiment of a metal laminated gasket according to the present invention, Figure 1 is a front view of a portion of the present invention is cut, Figure 2 is a cross-sectional view of the line aa of Figure 1, Figure 3 is a cross-sectional view of the bb line of FIG. .

Reference numeral 1 denotes a first plate constituting the gasket base material A, 2 denotes a second plate constituting the gasket material A by overlapping with the first plate 1, respectively, and refers to the first plate 1. On the side of the second plate 2, the folded portion 4, which is folded so as not to overlap with the second plate 2 and constitutes the cylinder hole 3, is provided, and the folded portion 4 is formed. The metal ring 6 surrounding the cylinder hole 3 is interposed between the folding piece 5 and the first plate 1.

The metal ring 6 consists of a wide part 6a and a narrow part 6b, and bolt holes in which the wide part 6a is installed in the gasket base material A (first and second plates 1 and 2). (7) is disposed closer to the narrower portion 6b and is projected from the folded portion 4 of the wider portion 6a between the first plate 1 and the second plate 2. A bead 8 surrounding the metal ring 6 is arranged on the second plate 2 so as to be arranged in a separate manner.

In addition, the wide part said in the present invention refers to the part which protrudes from the bending part 4 and is interposed between the 1st, 2nd plates 1 and 2 when it says in an Example, The shape (planar illustration) It is not necessary to limit to the shape of this embodiment.

In addition, the second plate 2 has a portion overlapping the metal ring 6 (for example, FIG. 1) and a portion not overlapping (for example, FIG. 2), resulting in a so-called boundary portion of these portions. Although a step occurs, the presence of the step restricts the rotation of the metal ring 6 so that the ring 6 is held in position, and a high surface pressure portion near the bolt hole is formed from the edge around the cylinder hole. Because of the separation, deformation of the edge around the cylinder hole can be prevented.

Since the present invention has the above configuration, it is possible to prevent the cylinder hole circumferential edge deformation due to the concentration of the tightening load near the fastening bolt at a step portion spaced apart from the cylinder hole, and the tightening load described above. It is possible to provide a gasket having a well-balanced surface pressure distribution.

Claims (2)

The first plate of the gasket base material consisting of the first plate and the second plate is folded back to the second plate so as not to overlap with the second plate, thereby forming a folded portion constituting a cylinder hole, and the return portion of the folded portion The metal ring surrounding the cylinder hole is refurbished between the folding piece and the first plate, and the first and second portions of the wide part protruding from the folding part by approaching the bolt hole than other parts of the metal ring are provided. Metal laminated gaskets sandwiched between two plates. The metal laminated gasket according to claim 1, wherein a bead surrounding the metal ring is provided on the second plate.