CN218151124U - Engine exhaust pipe sealing structure - Google Patents

Abstract

The application provides an engine exhaust pipe sealing structure which comprises a cylinder cover with a cylinder cover exhaust passage, an exhaust pipe and a water-cooling housing, wherein the cylinder cover exhaust passage is provided with an inserting section and a ventilating section, the inner diameter of the inserting section is larger than that of the ventilating section, and at least part of the exhaust pipe extends into the inserting section to be matched with the cylinder cover exhaust passage in an inserting manner; the water-cooling housing encloses to have the gas storage chamber, and the part of blast pipe is located the gas storage chamber, and the water-cooling housing has the opening that supplies the blast pipe to stretch out, has the air current passageway of intercommunication gas storage chamber between the outer wall of open-ended internal week and blast pipe, and the water-cooling housing offsets with the terminal surface of cylinder cap, and butt position department is provided with first sealing washer. Through setting up the sealing washer in the butt department of water-cooling housing and cylinder cap for the sealing washer has the contained angle with gaseous flow path, makes most air current flow from airflow channel, has alleviateed gaseous directly towards the sealing washer, can avoid gaseous impact and high temperature to cause the influence to sealing washer self under the sealed effect of guarantee sealing washer.

Description

Engine exhaust pipe sealing structure

Technical Field

The application belongs to the technical field of engine exhaust, and particularly relates to an engine exhaust pipe sealing structure.

Background

In the production process of automobiles, engines serve as hearts of automobiles and play a leading role in the driving process of the automobiles, and the automobiles gradually go into thousands of households along with the development of times, but the automobiles are convenient for people to go out and live, waste gas generated by the automobiles is a big problem which is difficult to solve, especially, the connection part of an engine exhaust pipeline inside the automobiles is likely to cause leaked gas pollution and damage to the internal structure of the automobiles, and the internal structure of the automobiles is likely to be influenced due to overhigh temperature of the leaked gas.

The exhaust pipe is usually connected in multiple sections by means of splicing or screwing and the like in the prior art, but the problem of exhaust leakage inevitably occurs at the joint of the exhaust pipe, so that the sealing structure is usually arranged at the joint of the sections of the exhaust pipe in the prior art to prevent gas leakage to a great extent. However, the sealing ring is directly arranged at the joint of the exhaust pipe in most of the existing sealing structures, the periphery of the inner pipeline is sleeved with the sealing ring, the end face of the sealing ring is perpendicular to the axial direction of the pipeline, when airflow leaks, the flow direction of the gas is along the axial direction of the pipeline, and therefore the problem that the end face of the sealing ring is directly impacted by the exhaust gas can be caused, the sealing ring can be deformed and damaged due to the direct thrust given by the exhaust gas and the high temperature of the gas, the service life of the sealing ring is influenced, and the sealing effect of the sealing structure can be reduced after the sealing ring is used for a period of time.

SUMMERY OF THE UTILITY MODEL

The application provides an engine exhaust pipe sealing structure to solve among the prior art the gas leakage of exhaust duct junction and the poor problem of seal structure sealing effect.

The technical scheme adopted by the application is as follows:

the application provides an engine exhaust pipe sealing structure, which comprises a cylinder cover with a cylinder cover exhaust pipe, an exhaust pipe and a water-cooling housing, wherein the cylinder cover exhaust pipe is provided with an insertion section and a ventilation section, the inner diameter of the insertion section is larger than that of the ventilation section, and at least part of area of the exhaust pipe extends into the insertion section to be in insertion fit with the cylinder cover exhaust pipe; the water-cooling housing is enclosed to form a gas storage cavity, a partial area of the exhaust pipe is located in the gas storage cavity, the water-cooling housing is provided with an opening through which the exhaust pipe extends, an airflow channel communicated with the gas storage cavity is arranged between the inner periphery of the opening and the outer wall of the exhaust pipe, the water-cooling housing abuts against the end face of the cylinder cover, and a first sealing ring is arranged at the abutting position of the water-cooling housing and the cylinder cover.

As a preferred embodiment of the application, an included angle is formed between the abutting surfaces of the water-cooling cover shell and the cylinder cover and the airflow channel.

As a preferred embodiment of the present application, the sealing structure further includes a first receiving groove disposed at an abutting surface of the cylinder cover and/or an abutting surface of the water-cooled housing, and the first receiving groove is used for receiving the first sealing ring.

As a preferred embodiment of this application, the water-cooling housing includes the location portion that butts with the cylinder cap to and connecting portion, connecting portion and location portion detachably connect, and connecting portion and location portion cooperate and enclose into the gas storage chamber.

As a preferred embodiment of the present application, a second sealing ring and a second receiving groove for receiving the second sealing ring are disposed at a joint of the connecting portion and the positioning portion.

As a preferred embodiment of the application, the sealing structure further comprises a fixing piece for connecting the cylinder cover and the positioning part, so that the cylinder cover is abutted to the water-cooling housing.

In a preferred embodiment of the present application, a stop surface is provided between the plug section and the venting section, and the wall of the exhaust pipe has a flow-guiding bevel which is arranged obliquely to the interior of the exhaust pipe.

As a preferred embodiment of this application, the grafting section inner wall is provided with the bead, and the bead is in butt joint with the outer wall of blast pipe.

In a preferred embodiment of the present application, the sealing structure further includes an exhaust pipe heat dissipating portion attached to a partial region of the exhaust pipe.

As a preferred embodiment of this application, the blast pipe is linked together with the gas storage chamber, and the blast pipe is provided with the check valve with the junction in gas storage chamber, and the check valve sets up to the structure of the inside one-way conduction of blast pipe from the gas storage chamber.

Due to the adoption of the technical scheme, the technical effect obtained by the application is as follows:

1. this application is greater than the internal diameter of the section of ventilating through the internal diameter that sets up the grafting section, and blast pipe and cylinder cap exhaust passage grafting cooperation, make the gas that leaks between blast pipe and the cylinder cap exhaust passage get into airflow channel through grafting section and blast pipe gap, and get into the gas storage chamber in the water-cooling housing, not only can prolong gaseous leakage route, reduce gaseous temperature and impact force, can also make the gas of leaking carry out temporary storage in flowing to the gas storage chamber through the airflow channel, the gas storage chamber is enclosed by the water-cooling housing and closes and forms, can play the cooling effect to a certain extent to the gas of temporary storage therein, and prevent that waste gas from leaking to the outside.

In addition, this application sets up first sealing washer in the butt position of water-cooling housing and cylinder cap, can prevent to a great extent that gas from revealing by the gap between water-cooling housing and the cylinder cap, it is further, because gaseous along airflow channel, that is also the axial flow of blast pipe, this application sets up the sealing washer in the butt department of water-cooling housing and cylinder cap, make the surface of sealing washer and gaseous flow path have the contained angle, and most air current flows from airflow channel, only very little some air current is revealed from the sealing washer, and then to a great extent has avoided the gas of leaking between cylinder cap exhaust passage and the blast pipe to carry out the direct impact to the sealing washer, can be under the sealed effect of guarantee sealing washer, the impact and the high temperature that to a great extent avoided gas lead to the fact the influence to sealing washer self, the life of extension sealing washer, further improve seal structure's sealed effect.

2. As a preferred embodiment of the self, the water-cooling sealing device has the advantages that the abutting surfaces of the water-cooling housing and the cylinder cover can have an inclination angle with the air flow channel, so that the abutting surfaces deviate from the axial direction of the exhaust pipe, the air flow quantity leaked from the abutting surfaces is further reduced, the direct impact of air on the sealing ring is further weakened, and when the abutting surfaces are perpendicular to the air flow channel, the abutting surfaces of the water-cooling housing and the cylinder cover can be regarded as vertical planes, the installation between the water-cooling housing and the cylinder cover and the arrangement of the first sealing ring are convenient, the phenomenon that the impact of the air on the first sealing ring is uneven due to the inclination of the abutting surfaces is avoided to a great extent, the temperature of each part of the first sealing ring can be uniform, and the sealing performance of the first sealing ring is improved.

3. As a preferred embodiment of the present application, the first accommodating groove is provided, so that on one hand, the position of the first sealing ring can be limited, and the sealing ring can be prevented from falling off to a great extent; on the other hand, no matter the first accommodating groove is arranged on the cylinder cover or the water-cooling housing, the first sealing ring can be in full contact with the other opposite abutting surface, and at least part of the first sealing ring is enclosed, so that the sealing effect of the first sealing ring can be improved, and the first sealing ring can be protected to a certain extent through the first accommodating groove.

4. As a preferred embodiment of this application, this application can be convenient for carry out dismouting and change to the water-cooling housing through the connection dismantled of location portion and connecting portion, when the blast pipe damages to need to be changed, can only dismantle location portion and connecting portion, take off connecting portion, can dismantle and change the blast pipe, can improve seal structure's change and installation effectiveness. Moreover, the second sealing ring and the second accommodating groove are arranged between the connecting portion and the positioning portion, so that gas leakage between the connecting portion and the positioning portion can be prevented to a great extent, and the sealing effect is further improved.

5. As an optimal implementation mode of this application, this application not only can pass through the pretightning force that the mounting provided through setting up mounting fastening cylinder cap and location portion for butt department gap between cylinder cap and the water-cooling housing is littleer, weakens gaseous leakage, can also make the first sealing washer that is in cylinder cap and water-cooling housing butt department be in the state of compressing tightly, improves sealed effect.

6. As a preferred embodiment of the application, the effect of reminding the plugging of the exhaust pipe and the exhaust pipe of the cylinder cover in place can be achieved through the arrangement of the stop surface at the plugging section, so that the connection between the exhaust pipe of the cylinder cover and the exhaust pipe is more convenient; moreover, the pipe wall of the exhaust pipe is provided with the flow guide inclined plane which is obliquely arranged towards the interior of the exhaust pipe, so that when leaked gas passes through the flow guide inclined plane, part of the gas flows towards the exhaust pipe under the guidance of the flow guide inclined plane due to the pushing of the rear gas to the front gas, the external leakage of the gas can be reduced, and the sealing effect is further improved; and, this application sets up the bead at the inner wall of grafting section, can play the fastening effect to being connected between cylinder cap exhaust passage and the blast pipe on the one hand, and on the other hand can also block the flow of revealing gas through the small protruding of bead, improves sealed effect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the application and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an engine exhaust pipe sealing structure according to an embodiment of the present disclosure;

fig. 2 is a partial enlarged view of fig. 1A of the present application.

Reference numerals are as follows:

100 cylinder covers, 101 cylinder cover exhaust passages, 102 ventilation sections, 103 plug sections, 110 exhaust pipes, 111 first sealing rings, 112 first containing grooves, 120 water-cooling housings, 121 gas storage cavities, 122 positioning parts, 123 connecting parts, 124 second sealing rings, 125 second containing grooves, 126 fixing parts and 127 exhaust pipe heat dissipation parts.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1, the present application provides an engine exhaust pipe sealing structure, which includes a cylinder head 100 having a cylinder head exhaust passage 101, an exhaust pipe 110, and a water-cooled housing 120, where the cylinder head exhaust passage 101 has an insertion section 103 and a ventilation section 102, an inner diameter of the insertion section 103 is greater than an inner diameter of the ventilation section 102, and at least a partial region of the exhaust pipe 110 extends into the insertion section 103 to be inserted into and matched with the cylinder head exhaust passage 101.

The water-cooling housing 120 is surrounded with a gas storage cavity 121, a partial region of the exhaust pipe 110 is located in the gas storage cavity 121, the water-cooling housing 120 is provided with an opening through which the exhaust pipe 110 extends, an airflow channel communicated with the gas storage cavity 121 is arranged between the inner periphery of the opening and the outer wall of the exhaust pipe 110, the water-cooling housing 120 abuts against the end surface of the cylinder head 100, and a first sealing ring 111 is arranged at the abutting position of the water-cooling housing 120 and the cylinder head 100.

Specifically, as shown in fig. 1 and 2, after the exhaust pipe 110 is inserted into the plug section 103, a gap inevitably exists between the outer periphery thereof and the inner wall of the plug section 103, and the gap extends in the axial direction of the exhaust pipe 110, so that the air flow leaks from the gap. The air flow passage between the water-cooled housing 120 and the exhaust pipe 110 is also along the axial direction of the exhaust pipe 110, so that the leaked air can directly enter the air storage chamber 121 through the air flow passage without turning. Not only can prolong gaseous leakage path, reduce gaseous temperature and impact force, can also come to keep in the gas of revealing through gas storage chamber 121, to a great extent prevents that gas from revealing to the outside to come to carry out the cooling of certain degree to the gas of gas storage chamber 121 inside through water-cooling housing 120.

Similarly, as shown in fig. 1, a certain gap is also inevitably formed between the abutting surfaces of the cylinder head 100 and the water-cooled housing 120, so that a branch path for air flow leakage is formed, and an included angle is formed between the branch path and the air flow channel. So that the leaking gas flow needs to be diverted at an angle to be able to leak from the branch. Set up the sealing washer in branch road department, not only can prevent to a great extent that gas from revealing by branch road department, and because gaseous along airflow channel, also be exactly that exhaust pipe 110's axial flow, the sealing washer sets up and can avoid the gas that the gap of grafting section 103 and exhaust pipe 110 junction revealed to a certain extent to the sealing washer directly towards here, can be under the prerequisite of the sealed effect of guarantee, reduce the impact of gas and the influence that high temperature caused to sealing washer self, the life of extension sealing washer improves sealed effect.

As a preferred embodiment of the present application, an angle is formed between the abutting surface of the water-cooled cover shell 120 and the cylinder head 100 and the airflow channel, that is, the abutting surface of the cylinder head 100 and the airflow channel may be perpendicular, or an inclined angle is formed between the abutting surface of the cylinder head 100 and the airflow channel; because the abutting surface of the cylinder cover 100 can be regarded as a vertical plane when the airflow channel is vertical, the installation between the two and the arrangement of the first seal ring 111 are facilitated, the phenomenon that the impact of the air on the first seal ring 111 is uneven due to the inclination of the abutting surface is avoided to a great extent, the temperature of each part of the first seal ring 111 is uniform, and the sealing performance of the first seal ring 111 is improved.

Further, as shown in fig. 1, the cross-sectional shape of the water-cooling housing 120 is not limited, and may be a square structure, a circular structure, a diamond structure, or the like; moreover, the end surface of the water-cooling housing 120 with the opening can be abutted against the end surface of the cylinder head 100 with the insertion section 103.

As a preferred embodiment of the present application, the sealing structure further includes a first receiving groove 112 provided at an abutting surface of the cylinder head 100 and an abutting surface of the water-cooled cover 120, and the first receiving groove 112 is configured to receive the first gasket 111.

It can be understood that, in the present application, the arrangement position of the first receiving groove 112 is not particularly limited, for example, a part of the first receiving groove 112 may be respectively arranged on the abutting surfaces of the cylinder head 100 and the water cooling cover, and the first sealing ring 111 may be arranged therein; a first accommodating groove 112 may be formed in the abutting surface of the cylinder head 100, and the first seal ring 111 is disposed therein and enclosed with the first accommodating groove 112 by the abutting surface of the water-cooled housing 120; as shown in fig. 1, a first receiving groove 112 may be formed in a contact surface of the water-cooled cover 120, and the first sealing ring 111 is disposed therein and enclosed with the first receiving groove 112 through the contact surface of the cylinder cover 100.

In addition, this application does not do specifically limit to the shape and the quantity of first sealing washer 111 shown yet, for example first sealing washer 111 can select for use an O type sealing washer to set up in first containing groove 112, can also select for use two O type sealing washers to stack in first containing groove 112, further promotes sealed effect. In addition, the first accommodating groove 112 is arranged to limit and protect the first sealing ring 111, so that the sealing ring can be prevented from falling off to a great extent, and the sealing ring can be protected to a certain extent.

As a preferred embodiment of the present application, the water-cooled housing 120 includes a positioning portion 122 abutting against the cylinder head 100, and a connecting portion 123, the connecting portion 123 is detachably connected to the positioning portion 122, and the connecting portion 123 and the positioning portion 122 cooperate to enclose the air storage chamber 121. The positioning portion 122 and the connecting portion 123 may be provided with matching holes that match with each other, and the sealing structure may further include a matching piece that penetrates through the matching holes to detachably connect the positioning portion 122 and the connecting portion 123; it is understood that the detachable connection between the positioning portion 122 and the connecting portion 123 may be achieved by screwing or bolting.

Further, a second sealing ring 124 and a second receiving groove 125 for receiving the second sealing ring 124 are disposed at a joint of the connecting portion 123 and the positioning portion 122. Through the arrangement of the second receiving groove 125 and the second sealing ring 124, the gas leakage at the connection between the connection portion 123 and the positioning portion 122 can be prevented to a great extent, and the sealing effect of the sealing structure is further improved.

It is understood that the second sealing ring 124 and the second receiving groove 125 may be configured and arranged in the same manner as the first sealing ring 111 and the first receiving groove 112, and therefore, the present application is not specifically described herein.

In addition, optionally, the positioning portion 122 and the connecting portion 123 may also adopt an integrated structure, which not only facilitates processing, but also further improves the sealing effect of the sealing structure because the two parts no longer have a connecting gap.

As a preferred embodiment of the present application, the sealing structure further includes a fixing member 126 for connecting the cylinder head 100 and the positioning portion 122, so that the cylinder head 100 is in contact with an abutment surface of the water-cooled housing 120. Similarly, the cylinder head 100 and the positioning portion 122 may also be detachably connected to each other, so as to facilitate the assembly and disassembly of the cylinder head 100 and the water-cooled housing 120.

The fixing piece 126 can provide pre-tightening force to the cylinder cover 100 and the positioning part 122, so that the cylinder cover 100 and the water-cooling housing 120 are firmly abutted, and the installation gap between the cylinder cover 100 and the water-cooling housing 120 can be reduced; further, since the first seal ring 111 is provided here, the first seal ring 111 can be brought into a compressed state even if the mounting gap therebetween is reduced, and the sealing effect of the first seal ring 111 can be improved.

Preferably, as shown in fig. 2, a stop surface (not labeled) is provided between the plug section 103 and the vent section 102, and the wall of the exhaust pipe 110 has a diversion inclined surface inclined toward the inside of the exhaust pipe 110. Wherein, the backstop face can be the step face, and the water conservancy diversion inclined plane also can be the transition fillet. Alternatively, the diversion inclined plane may also be disposed at the air inlet of the exhaust pipe 110, so as to achieve the same diversion effect.

It can be understood that after the gas flows out from the gap between the plug section 103 and the exhaust pipe 110, the flow direction of the gas changes due to the stepped surface structure of the stop surface, at this time, the gas reaching the diversion inclined surface moves along the smooth inclined surface due to the propulsion of the gas at the rear, and part of the gas may move toward the exhaust pipe 110 under the transition action of the diversion inclined surface, that is, the setting of the diversion inclined surface can reduce the leakage of the gas to a certain extent, thereby improving the sealing effect; moreover, the arrangement of the step surface can also play a role in reminding the plugging between the exhaust pipe 110 and the cylinder cover exhaust passage 101 in place, so that the connection between the cylinder cover exhaust passage 101 and the exhaust pipe 110 is more convenient.

Further, the inner wall of grafting section 103 can be provided with the bead (not shown in the figure), bead and exhaust pipe 110's outer wall looks butt, and further, the bead can be the arc arch to encircle and set up in the inner wall of shoulder hole, perhaps use the center of shoulder hole as the benchmark, even interval distribution improves the fastening degree between exhaust pipe 110 and the grafting section 103 in the inner wall of shoulder hole, can also block gaseous flow through the bead to a certain extent, improves sealed effect.

Alternatively, the rib may be a structure integrally formed with the plug section 103, so as to facilitate processing of the cylinder head exhaust passage 101; or, the bead in this application also can set up with the outer wall of blast pipe 110, be integrated into one piece's structure with blast pipe 110 to with the inner wall looks butt of grafting section 103, can reach the effect that reduces gas leakage and strengthen the fastening degree between grafting section 103 and blast pipe 110 through the bead equally.

As an alternative embodiment of the present application, the exhaust pipe 110 and the water-cooled housing 120 are detachably connected, and the specific structure of the detachable connection between the two can refer to the detachable connection between the positioning portion 122 and the connecting portion 123.

It should be noted that, the detachable connection manner mentioned in the present application should be added with a locking washer or other locking structures, so that on one hand, the connection between the structures is tighter, and on the other hand, the gas can be prevented from flowing in the gap at the connection to some extent.

Optionally, the water-cooled housing 120 may further include an exhaust pipe heat dissipation part 127 attached to a partial region of the exhaust pipe 110, so that the exhaust pipe heat dissipation part 127 can improve the cooling effect of the water-cooled housing 120 on the gas inside the exhaust pipe 110.

In a preferred embodiment of the present application, the exhaust pipe 110 is communicated with the air storage chamber 121, and a check valve is disposed at a connection position of the exhaust pipe 110 and the air storage chamber 121, and the check valve is configured to be in one-way communication from the air storage chamber 121 to the interior of the exhaust pipe 110.

It can be understood that the check valve may be an electric valve, that is, the check valve is connected to a control device of the whole automobile, and the check valve can be automatically opened after the engine is stopped, so that the gas in the gas storage chamber 121 flows along the check valve to the exhaust pipe 110 to be exhausted, and finally, the gas storage chamber 121 and the external air pressure are balanced.

Where not mentioned in this application, can be accomplished using or referencing existing technology.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. An engine exhaust pipe sealing structure is characterized by comprising a cylinder cover with a cylinder cover exhaust pipe, an exhaust pipe and a water-cooling housing, wherein the cylinder cover exhaust pipe is provided with an insertion section and a ventilation section, the inner diameter of the insertion section is larger than that of the ventilation section, and at least part of area of the exhaust pipe extends into the insertion section to be in insertion fit with the cylinder cover exhaust pipe;

the water-cooling housing encloses into there being the gas storage chamber, the subregion of blast pipe is located in the gas storage chamber, the water-cooling housing has the confession the opening that the blast pipe stretches out, open-ended interior week with intercommunication has between the outer wall of blast pipe the airflow channel in gas storage chamber, the water-cooling housing with the terminal surface of cylinder cap offsets, just the water-cooling housing with the butt position department of cylinder cap is provided with first sealing washer.

2. The engine exhaust pipe sealing structure according to claim 1, wherein an angle is formed between an abutting surface of the water-cooled cover and the cylinder head and the airflow passage.

3. The engine exhaust pipe sealing structure according to claim 2, further comprising a first receiving groove provided at an abutting surface of the cylinder head and/or an abutting surface of the water-cooled housing, the first receiving groove being configured to receive the first seal ring.

4. The sealing structure for the exhaust pipe of the engine according to claim 1, wherein the water-cooled housing includes a positioning portion abutting against the cylinder head, and a connecting portion, the connecting portion and the positioning portion are detachably connected, and the connecting portion and the positioning portion cooperate to enclose the air storage chamber.

5. The engine exhaust pipe sealing structure according to claim 4, wherein a second seal ring and a second receiving groove for receiving the second seal ring are provided at a joint of the connecting portion and the positioning portion.

6. The engine exhaust pipe sealing structure according to claim 5, characterized in that the sealing structure further comprises a fixing member for connecting the cylinder head and the positioning portion so that the cylinder head abuts against the water-cooled housing.

7. The exhaust pipe sealing structure of an engine according to claim 1, wherein a stop surface is provided between the plug section and the vent section, and a wall of the exhaust pipe has a guide slope that is inclined toward an inside of the exhaust pipe.

8. The engine exhaust pipe sealing structure according to claim 7, wherein a rib is provided on an inner wall of the plug section, and the rib abuts against an outer wall of the exhaust pipe.

9. An engine exhaust pipe sealing structure according to claim 1, further comprising an exhaust pipe heat dissipating portion attached to a partial region of the exhaust pipe.

10. The sealing structure for the exhaust pipe of the engine according to claim 9, wherein the exhaust pipe is in communication with the gas storage chamber, and a check valve is provided at a junction of the exhaust pipe and the gas storage chamber, the check valve being configured to conduct from the gas storage chamber to the inside of the exhaust pipe in a single direction.

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