JPH0552438U - Gasket for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the gasket is to prevent it from falling off when it is fitted into the port, to prevent misalignment, to facilitate installation work and to prevent gas leakage. [Structure] A gasket in which a stainless mesh, asbestos, or other sealing material 11 is caulked in a peripheral groove 13 around a ring 12 made of a thin metal plate, and a protrusion 14 is formed at least at two locations on the outer periphery of a side wall 13a of the ring 12. 1
4 is provided, and the dimension from the center of the gasket 10 to the tip of the protrusion 14 is slightly larger than the radius of the inner circumference of the peripheral wall portion 7 of the port 6.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 This invention relates to a gasket for an internal combustion engine.

[0002]

[Prior Art]

 For example, when connecting an exhaust pipe to a cylinder of an internal combustion engine of a motorcycle, a gasket is interposed between the connecting ends to prevent gas leakage. As shown in the cross section in FIG. 5, a gasket used for the connecting portion of such a pipe is generally made of a stainless steel mesh sealant 1 (may be asbestos) and a cross section U of the peripheral edge of the metal thin plate ring 2. It is often used that the side wall portions 3a and 3b of the peripheral groove 3 are fitted into the character-shaped peripheral groove 3 and are caulked from both sides.

By the way, as shown in FIG. 6, an exhaust port 6 of a cylinder head 5 has a slightly downward opening at a connection portion of an exhaust pipe 4 of an internal combustion engine, and a gasket is provided in a peripheral wall portion 7 of the exhaust port 6. After fitting 8, the end of the exhaust pipe 4 is inserted and tightened with the nut 9. However, since the exhaust port 6 is a downward opening, the gasket 8 is set in the exhaust port 6 and the exhaust pipe 4 is installed. Since the gasket 8 is likely to fall off before the end of is fitted, workability is poor.

Therefore, conventionally, the gasket 8 is deformed into an elliptical shape so that the major axis thereof is fitted into the inner diameter of the peripheral wall portion 7 of the exhaust port 6 by frictional force, and after the fitting, the exhaust pipe is temporarily held and then the exhaust pipe. It is designed to fit 4 in.

[0005]

[Problems to be solved by the device]

 However, when the gasket 8 is deformed into an elliptical shape, by using the long diameter, it is possible to prevent the falling, but the area around the short diameter side is in contact with the contact surface of the exhaust port 6, and the gas leakage easily occurs. Even if the gasket 8 is a perfect circle, there is a problem in that the gasket 8 slips down and causes lubrication slippage, resulting in an insufficient upper seal. Therefore, the width of the contact surface of the exhaust port 6 is formed to be wide so as to prevent gas leakage. However, this causes an inconvenience such as an increase in the size of the cylinder.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a gasket for an internal combustion engine in which the gasket is not deformed and does not fall off when fitted into the port. With the goal.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, a gasket for an internal combustion engine according to the present invention is a gasket in which a stainless mesh, asbestos, and other sealing materials are caulked in a circumferential groove around a ring made of a thin metal plate. Protrusions are provided at least at two locations on the outer periphery, and the dimension from the center of the gasket to the tip of the protrusion is slightly larger than the radius of the inner periphery of the peripheral wall of the port.

[0008]

[Action]

 When the gasket is inserted into the peripheral wall of the port, the protrusions on the outer periphery of the gasket fit in contact with the inner surface of the peripheral wall, and will not fall off even if you release your hand from the gasket. Therefore, if the gasket is fitted and then the end of the pipe to be connected is inserted and tightened, the gasket will not be misaligned and will be in the correct position to reliably prevent gas leakage.

[0009]

【Example】

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

As shown in the cross section of FIG. 1, the gasket 10 is filled with a stainless mesh, asbestos, and other sealing material 11 in a U-shaped circumferential groove 13 at the periphery of a metal thin plate ring 12 as in the conventional case. Both side wall portions 13a and 13b of 13 are caulked from both sides to hold the sealing material 11.

The projections 14.14 ... Are formed at least at two locations (FIG. 2) or three locations (FIG. 3) on the outer periphery of the side wall portion 13a forming the circumferential groove 13. The height of the protrusion 14 is such that the dimension from the center of the gasket 10 to the tip of the protrusion 14 is slightly larger than the radius of the inner circumference of the peripheral wall portion 7 of the exhaust port 6.

Therefore, by pushing the projections 14, 14 ... into the peripheral wall portion 7 of the exhaust port 6 with the back side pushed, the projections 14, 14 ... Are slightly bent toward the sealing material 11 side as shown in FIG. It It is preferable to provide the protrusions 14, 14 at three positions at equal intervals as shown in FIG. 3 in order to prevent the gasket 10 from being misaligned. When the pipe 4 is inserted and tightened in this manner, the gasket 10 is interposed between the pipe 4 and the exhaust port 6 to prevent gas leakage. FIG. 4 is a partial cross-sectional view showing a portion corresponding to the portion A shown in FIG. 6 in an enlarged manner.

[0013]

[Effect of the device]

 As described above, according to the present invention, when the gasket is installed, the gasket is pushed into the peripheral wall of the port so that the gasket can be temporarily held without misalignment, and then the pipe can be inserted and tightened. Moreover, the gasket will not be misaligned and gas leakage will not occur. This makes it possible to reduce the width of the contact surface on the port side against which the gasket hits, which makes it possible to reduce the size of the cylinder, increase the surface pressure of the gasket, and improve the high-pressure gas sealability.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a gasket for an internal combustion engine according to the present invention.

FIG. 2 is a front view of a gasket for an internal combustion engine.

FIG. 3 is a front view showing a modified example of a gasket for an internal combustion engine.

FIG. 4 is a cross-sectional view showing a state in which a gasket for an internal combustion engine according to the present invention is fitted in an exhaust port of a cylinder head.

FIG. 5 is a half sectional view showing a conventional gasket.

FIG. 6 is a sectional view showing an example of a conventional gasket mounting portion.

[Explanation of symbols]

 1,11 Sealing material 2,12 Ring 3,13 Circumferential groove 4 Exhaust pipe 6 Exhaust port 7 Circumferential wall 8,10 Gasket 14 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A gasket in which a stainless steel mesh, asbestos, or other sealing material is caulked in a circumferential groove around a ring made of a thin metal plate, wherein protrusions are provided at least at two positions on the outer circumference of the side wall of the ring, and the center of the gasket is provided. A gasket for an internal combustion engine, wherein the dimension from the to the tip of the protrusion is slightly larger than the radius of the inner circumference of the peripheral wall portion of the port.