JPH03189317A - Exhaust system connector - Google Patents

Abstract

PURPOSE:To make a part contacting a seal ring so as not to come into contact with an exhaust manifold directly by installing a space, setting a clearance, between a seal ring contact part of a retainer or a seal receiver and the exhaust manifold. CONSTITUTION:A bolt 5 is set to an exhaust pipe connecting surface 2a of an exhaust manifold 2, and at time of this bolt setting, a retainer 6 is attached to a surface 2a. Here, this retainer 6 makes a part 6b extend in the exhaust flow direction in order from the side nearer to an outer circumferential part 6a adjoining to the surface 2a, forming it into a cylindrical part, and simultaneously makes a part 6c point at a direction orthogonal with an exhaust flow, forming it into a flange part, while it extends a part 6d in the exhaust flow direction to form it into a cylindrical part as well, whereby a space 7 setting a clearance between these parts 6b, 6c and the exhaust manifold 2 is partitioned off. With this constitution, heat conduction from the exhaust manifold 2 to the retainer 6, contacting with a seal ring 8 or a seal receiver 10 is not carried out directly, so that such a possibility that the seal ring 8 might be transferred with a large quantity of heat from the exhaust manifold 2 is preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust system connection device for connecting an exhaust pipe to an exhaust manifold.

(Prior art) Conventionally, as an exhaust system connection device, the
There is an exhaust pipe joint structure shown in Japanese Patent No. 9.

As shown in FIG. 6, this device has an exhaust pipe 31.
Flanges 33 and 34 are installed facing each other on the upstream exhaust pipe 31, and a seal ring 36 is provided on the flange 33 of the upstream exhaust pipe 31 via a retainer 35, and the spherical flare part 37 of the exhaust pipe 32 is brought into spherical contact with the outer periphery of the seal ring 36. , an elastic means 38 is provided to maintain this spherical contact state.

(Problem to be Solved by the Invention) Of the portions 35a and 35b of the retainer 35 that the seal ring 36 contacts, the portion 35a is attached to the flange 33.
When the retainer 35 is attached to an exhaust manifold made of cast iron and has a large heat capacity, and a conventional joint structure is used to connect the exhaust pipe to the exhaust manifold, a large amount of heat from the exhaust manifold is transferred to the retainer portion 35a. Since the heat is transmitted more directly to the seal ring 36, it is inevitable that the seal ring 36 made of expanded graphite or the like will have poor personnel resistance.

It is an object of the present invention to solve the above-mentioned problems by providing a structure in which the portion in contact with the seal ring does not directly contact the exhaust manifold.

(Means for Solving the Problems) For this purpose, the present invention provides that a seal ring is attached to one of the exhaust manifold and the exhaust pipe to be connected thereto via a retainer, and the other is in spherical contact with the outer periphery of the seal ring. In an exhaust system connection device provided with a seal receiver and equipped with elastic means to maintain this spherical contact state, a space is provided for setting a gap between the retainer attached to the exhaust manifold or the seal ring contacting part of the seal receiver and the exhaust manifold. It was established.

(Function) The seal ring, in cooperation with the seal receiver that makes spherical contact with its outer periphery, connects the exhaust manifold and the exhaust pipe airtightly and prevents leakage of exhaust gas.

On the other hand, an exhaust manifold with a large heat capacity is heated to a high temperature by exhaust gas, but in order to set a gap between the retainer or seal receiver in contact with the seal ring and the exhaust manifold, the retainer or Heat conduction to the seal receiving part does not take place directly, but only through the retainer or seal receiving part in contact with the exhaust manifold, which prevents the seal ring from receiving a large amount of heat from the exhaust manifold, and prevents the seal ring from transferring a large amount of heat from the exhaust manifold. It is possible to prevent the durability of the ring from deteriorating.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of the device of the present invention, and this example is configured as a pipe joint 4 for connecting an exhaust pipe 3 to an exhaust manifold 2 of a horizontal engine 1 for a vehicle, as shown in FIGS. 2 and 3. shows.

As clearly shown in FIG. 1, bolts 5 are installed on the exhaust pipe connecting surface 2a of the exhaust manifold 2, and during this installation, a retainer 6 is attached to the surface 2a. The retainer 6 has a portion 6b extending in the exhaust flow direction to form a cylindrical portion, and a portion 6C oriented in a direction perpendicular to the exhaust flow to form a flange portion, sequentially from the side closer to the outer peripheral portion 6a in contact with the surface 2a, By extending the portion 6d in the exhaust flow direction to form a cylindrical portion, the portion (ic
, 6d and the exhaust manifold 2 to define a space 7 that defines a gap.

A sealing ring 8 is attached to these parts in contact with the parts 5c and 5d.
The sleeve 9 is welded to the inner periphery of the portion 6d.

This sleeve is inserted into the port 2b of the exhaust manifold 2 and functions as an exhaust flow shielding means for preventing exhaust gas from entering the space 7.

The outer periphery 8a of the seal ring 8 is made into a spherical surface, and a seal receiver 10 that is in spherical contact with the outer periphery 8a is welded to the exhaust pipe 3.

The bolt 5 is loosely inserted into the seal receiver 10, and a spring 15 is compressed between the head 5a of the bolt 5 and the seal receiver 10. The spring 15 biases the seal receiver 10 (exhaust pipe 3) toward the exhaust manifold 2, and the seal receiver 10 and the seal ring 8
serves as an elastic means to maintain spherical contact between the

The operation of the above-mentioned embodiment will now be described. The exhaust gas emitted from each cylinder of the engine (1) is combined by the manifold 2, reaches the exhaust pipe 3, and is discharged into the atmosphere from there. The connection between the exhaust manifold 2 and the exhaust pipe 3 is sealed by the cooperation of the seal ring 8 and the seal receiver 10 to prevent exhaust gas from leaking to the outside.

On the other hand, heat conduction from the exhaust manifold 2, which is heated by exhaust gas and has a large heat capacity, to the seal ring 8 is prevented because the retainer parts 6c and 6d in contact with the seal ring 8 are separated from the exhaust manifold 2 by the space 7. Only a small amount of heat passes through the seal ring 8.
The retainer portion 5c is in contact with the retainer portion 5c.

6d does not directly transfer a large amount of heat from the exhaust manifold 2 to the seal ring 8. Therefore, the durability of the seal ring 8 can be prevented from being deteriorated by heat from the exhaust manifold 2 having a large heat capacity. The sleeve 9 also prevents high-temperature exhaust gas from flowing into the space 7, thereby preventing the exhaust gas from directly heating the retainer portions 6c, 6d and deteriorating the durability of the seal ring 8.

Incidentally, during operation of the engine 1, prying in the direction of the arrow in FIG. It can be damped by the sliding resistance of the parts. Furthermore, vertical vibrations during operation of the engine 1 are absorbed and attenuated at the transition corner between the retainer parts 6b and 6c. As a result, the absolute resonance level of the exhaust pipe 3 is reduced, and the level of unpleasant vibrations exerted on the vehicle body can be reduced from the level shown by the dotted line in FIG. 5 to the level shown by the solid line.

FIG. 4 shows another example of the present invention, in which the seal ring 8 is arranged in the opposite direction and is attached on the exhaust pipe 3 via a retainer 11. Then, a seal receiver 12 that makes spherical contact with the outer periphery of the seal ring 8 is attached to the exhaust pipe connecting surface 2a of the exhaust manifold 2 with bolts 5.

The seal receiver 12 has a part 12b extending in the exhaust flow direction to form a cylindrical part, a part 12C which is a spherical part which is in contact with the outer spherical surface of the seal ring 8, and a part 12C which is a cylindrical part which is in contact with the outer spherical surface of the seal ring 8. By making 12d a cylindrical portion that enters into the port 2b of the exhaust manifold, a space 13 for setting a gap between the portion 12c of the seal receiver 12 in contact with the seal ring 8 and the exhaust manifold 2 is defined.

Note that an adapter 14 is interposed between the seal receiver 12b and the exhaust manifold 2, and the adapter 14 is spot-welded to the seal receiver 12 to function as a shielding means for preventing exhaust gas from flowing into the space 13. good.

In this example as well, since the portion 12C of the seal receiver 12 in contact with the seal ring 8 is separated from the exhaust manifold 2 by the space 13, the seal receiver in contact with the seal ring 8 is As for the heat conduction to the portion 12C, only a small amount of heat passes through the portion 12a of the seal receiver, and it is possible to prevent the durability of the seal ring 8 from deteriorating. Further, since the inflow of exhaust gas into the space 13 is blocked by the adapter 14, the seal receiver does not have the portion 12C directly heated by the exhaust gas, thereby preventing deterioration of the durability of the seal ring 8.

(Effects of the Invention) Thus, as described above, the device of the present invention is attached to the exhaust manifold, and a space is provided so that the seal ring contacting portion of the retainer or seal receiver does not come into direct contact with the exhaust manifold. It is possible to prevent a large amount of heat from being transferred to the contact portion, and the durability of the seal ring can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts showing one embodiment of the exhaust system connection device of the present invention, Figs. 2 and 3 are perspective views and side views of an engine showing the locations where the device is applied, and Fig. 4 is a sectional view of the main part showing an embodiment of the exhaust system connection device of the present invention. 5 is a diagram showing the acceleration amplitude level when using the device of the present invention in comparison with the normal case, and FIG. 6 is a sectional view of the main part similar to FIG. 1 showing another example of the device. FIG. 1...Engine 2...Exhaust manifold 3
...Exhaust pipe 6.11...Retainer 7.
13...Space...Seal ring 9...
Sleeve (exhaust flow shielding means) 10, 12... Seal receiver 14... Adapter (exhaust flow shielding means) 15... Spring (elastic means) 1 Fig. 4 Fig. 2 Fig. 3 Fig. 5 〉Shin rotation maki (rpm)

Claims (1)

[Claims] 1. A seal ring is attached to one of the exhaust manifold and the exhaust pipe to be connected to the exhaust manifold via a retainer, and a seal receiver is provided on the other side to make spherical contact with the outer periphery of the seal ring, and this spherical contact state An exhaust system connecting device equipped with elastic means for maintaining the exhaust system, characterized in that a space is provided to set a gap between the retainer attached to the exhaust manifold or the seal ring contacting part of the seal receiver and the exhaust manifold. Connection device. 2. The exhaust system connection device according to claim 1, further comprising exhaust flow shielding means for preventing exhaust gas from entering the space.