CN216642294U - Engine - Google Patents

Abstract

The utility model discloses an engine, comprising: a cylinder head; the air inlet and outlet mechanism comprises an air inlet mechanism and an air outlet mechanism; a cam mechanism; a cylinder head cover at least partially connected with the cylinder head; an ignition mechanism at least partially disposed in the receiving space; the engine further includes: a firing hole at least partially disposed in the receiving space and at least partially disposed in the cylinder head cover; the ignition mechanism is at least partially arranged in the ignition hole; be equipped with the air vent between ignition hole and the cylinder head cover, the air vent communicates ignition hole and runs through the cylinder head cover, and the air vent still communicates to the surface of cylinder head cover through the cylinder head cover. The utility model has the beneficial effects that: air and water in the ignition hole can be discharged out of the ignition hole, air pressure in the ignition hole and external air pressure are balanced, and ignition interruption is avoided; in addition, a cooling mechanism with a larger cross-sectional area can be arranged around the ignition hole and the ignition mechanism, so that the ignition hole and the ignition mechanism can be cooled conveniently.

Description

Engine

Technical Field

The utility model relates to the field of power systems, in particular to an engine.

Background

In the prior art, air and water in the ignition hole are discharged out of the ignition hole by arranging the vent hole in the cylinder cover of the engine, so that the air pressure in the ignition hole and the external air pressure are balanced, an ignition mechanism works stably, and the phenomenon of ignition interruption is avoided. However, in the actual operation process of the ignition mechanism, after the vent holes are arranged in the above mode, the cooling mechanism is small in size, so that the heat dissipation effect is poor, the temperatures of the ignition mechanism and the ignition holes are high, and the service life of the ignition mechanism is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of poor heat dissipation effect caused by the arrangement of the vent holes, the utility model provides an engine, which comprises: a cylinder head formed with an accommodation space; the air inlet and exhaust mechanism is at least partially arranged in the accommodating space and comprises an air inlet mechanism and an exhaust mechanism, the air inlet mechanism is used for air inlet of the engine, and the exhaust mechanism is used for exhaust of the engine; the cam mechanism is at least partially arranged in the accommodating space and is used for controlling the air inlet and outlet mechanisms; the cylinder cover is at least partially connected with the cylinder cover and used for sealing the engine; the ignition mechanism is at least partially arranged in the accommodating space and is used for igniting the combustible mixture; the engine further includes: a firing hole at least partially disposed in the receiving space and at least partially disposed in the cylinder head cover; the ignition mechanism is at least partially arranged in the ignition hole; be equipped with the air vent between ignition hole and the cylinder head cover, the air vent communicates ignition hole and runs through the cylinder head cover, and the air vent still communicates to the surface of cylinder head cover through the cylinder head cover.

Further, the engine also comprises a cylinder body, wherein the cylinder body is connected with a cylinder head, and the cylinder head is arranged between the cylinder body and a cylinder head cover; the ignition hole comprises a first communication hole and a second communication hole, the first communication hole is communicated with the cylinder cover, and the second communication hole is communicated with the cylinder body.

Furthermore, one end of the vent hole is communicated with the first communication hole, and the other end of the vent hole is communicated with the outer surface of the cylinder head cover.

Further, the vent hole includes a third communication hole and a fourth communication hole that communicate with each other, the third communication hole communicating with the ignition hole, and the fourth communication hole communicating with an outer surface of the cylinder head cover.

Further, the distance from the third communication hole to the second communication hole is shorter than the distance from the fourth communication hole to the second communication hole.

Further, the ignition hole includes a first ignition hole and a second ignition hole; the vent holes comprise a first vent hole and a second vent hole; the first vent hole is arranged between the first ignition hole and the cylinder cover; the second vent hole is disposed between the second ignition hole and the cylinder head cover.

Further, the first vent hole communicates the first ignition hole and the outer surface of the cylinder head cover; the second vent hole communicates the second ignition hole and the outer surface of the cylinder head cover.

Further, the engine further comprises a cooling mechanism; the cooling mechanism is at least partially disposed in the receiving space and at least partially surrounds the ignition mechanism, and the cooling mechanism is used for cooling the ignition mechanism.

Further, the ignition mechanism includes: a spark plug at least partially disposed in the ignition hole; an ignition coil in which a spark plug is at least partially disposed; the cooling mechanism is disposed at least partially around the spark plug.

Further, the cooling mechanism extends at least partially to the second communication hole.

Compared with the prior art, one end of the vent hole can be communicated with the ignition hole, and the other end of the vent hole penetrates through the cylinder cover to be communicated with the outside, so that air and water in the ignition hole are discharged out of the ignition hole, the air pressure in the ignition hole and the outside air pressure are balanced, and ignition interruption is avoided; in addition, a cooling mechanism with a larger cross-sectional area can be arranged around the ignition hole and the ignition mechanism, so that the ignition hole and the ignition mechanism can be cooled conveniently.

Drawings

Fig. 1 is a schematic perspective view of an engine according to the present invention.

Fig. 2 is an exploded view of the overall structure of the engine of the present invention.

Fig. 3 is a schematic cross-sectional structure of the engine of the present invention.

Fig. 4 is a partial structural schematic diagram of the engine of the present invention.

Fig. 5 is a schematic view of a half-section structure of the engine of the present invention.

Fig. 6 is a second cross-sectional structural schematic view of the cylinder head of the present invention.

Fig. 7 is a third cross-sectional structural schematic view of the cylinder head of the present invention.

Fig. 8 is a schematic structural view of the cylinder head cover of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention in the specific embodiment will be clearly and completely described below with reference to the attached drawings in the embodiment of the present invention.

As shown in fig. 1 to 3, an engine 100 includes an outer housing assembly 200, and the outer housing assembly 200 includes a head cover 1, a cylinder head 2, a cylinder block 3, a crankcase 4, and an oil pan 5. Wherein, the two sides of the crankcase 4 are provided with side covers 6. The cylinder head cover 1 is used to cover and seal the cylinder head 2, keeping lubricating oil inside the engine 100, while insulating dirt, moisture, and the like from outside the engine 100. The cylinder head 2 is connected to the cylinder block 3 to form a substantially sealed space for sealing gas and constituting a combustion space to withstand high-temperature and high-pressure combustion gas. The cylinder block 3 and the crankcase 4 are basic structures of the engine 100. The oil pan 5 serves to close the crankcase 4 and, after being connected to the crankcase 4, constitutes an oil sump to prevent the entry of impurities and to collect and store lubricating oil that has been freed at the various friction surfaces of the engine 100.

As shown in fig. 2 to 5, the engine 100 further includes a cam mechanism 7, an intake/exhaust mechanism 8, an ignition mechanism 9, a piston mechanism 11, a transmission mechanism 12, a crankshaft link mechanism 13, and a balance mechanism 14. The outer housing assembly 200 forms an accommodating space 201, and the cam mechanism 7, the intake and exhaust mechanism 8, the ignition mechanism 9, the piston mechanism 11, the transmission mechanism 12, the crankshaft connecting rod mechanism 13 and the balance mechanism 14 are at least partially disposed in the accommodating space 201. In the present embodiment, the accommodating space 201 includes a first accommodating space 2011, a second accommodating space 2012, and a third accommodating space 2013.

Here, the cylinder head 2 forms a first housing space 2011, and the cam mechanism 7, the intake/exhaust mechanism 8, and the ignition mechanism 9 are at least partially disposed in the first housing space 2011. The cylinder block 3 forms a second accommodation space 2012, and the piston mechanism 11 is at least partially disposed in the second accommodation space 2012. The crankcase 4 forms a third accommodation space 2013, and the transmission mechanism 12, the crankshaft connecting rod mechanism 13, and the balance mechanism 14 are at least partially disposed in the third accommodation space 2013. The crankshaft connecting rod mechanism 13 connects the cam mechanism 7, the piston mechanism 11, and the balance mechanism 14. The cam mechanism 7 contacts the intake and exhaust mechanism 8.

As shown in fig. 4 and 5, the intake and exhaust mechanism 8 includes an intake mechanism 81 and an exhaust mechanism 82. The ignition mechanism 9 is provided between the intake mechanism 81 and the exhaust mechanism 82. The crankshaft connecting rod mechanism 13 includes a crankshaft 131 and a connecting rod 132, one end of the connecting rod 132 is connected with the piston mechanism 11, the other end of the connecting rod 132 is connected with the crankshaft 131, and the crankshaft 131 and the balance mechanism 14 are connected through gear engagement. The piston mechanism 11 includes a piston 111 and a piston pin 112, and the piston 111 and a connecting rod 132 are connected by the piston pin 112. In the axial direction of the ignition mechanism 9, the cylinder block 3 is provided near one end of the ignition mechanism 9, and the cam mechanism 7 is provided near the other end of the ignition mechanism 9. The cam mechanism 7 includes a cam shaft 71 and a shaft seat 72, and the cam shaft 71 includes a first wheel shaft 711 and a second wheel shaft 712. The cylinder head cover 1 and the cylinder head 2 are connected by an axle seat 72. As shown in fig. 2, the crankshaft 131 is connected to the cam mechanism 7 through a valve train assembly 15, the valve train assembly 15 is disposed in a receiving space surrounded by the cylinder head 2, the cylinder block 3, and the crankcase 4, the valve train assembly 15 includes a timing chain 151, and the crankshaft 131 is connected to the cam mechanism 7 through the timing chain 151. As shown in fig. 2 to 4, the transmission mechanism 12 includes a transmission main shaft 121 and a transmission auxiliary shaft 122, and the transmission main shaft 121 and the transmission auxiliary shaft 122 are connected by gear engagement. The crankshaft 131 drives the transmission mechanism 12, and transmits power to the front wheels and/or the rear wheels of the vehicle through the transmission mechanism 12, thereby driving the vehicle to run.

As shown in fig. 5, a space between the ignition mechanism 9 and the cylinder block 3 is a combustion chamber 16. The combustion chamber 16 is provided as a space between the top of the piston 111 and the bottom surface of the cylinder head 2 after the piston 111 reaches top dead center. The top dead center is a position at which the top of piston 111 is farthest from the center of rotation of crankshaft 131. The top of the piston 111 refers to the end surface of the piston 111 near the cylinder head 2, and the bottom surface of the cylinder head 2 refers to the surface of the cylinder head 2 near the top of the piston 111.

The piston 111 is driven by the crankshaft connecting rod mechanism 13, so that the piston 111 is linearly reciprocated in the cylinder block 3.

The intake mechanism 81 is used for feeding fresh air or combustible mixture into the combustion chamber 16, the ignition mechanism 9 ignites the fresh air or combustible mixture to cause combustion of the fresh air or combustible mixture in the combustion chamber 16, and the piston mechanism 11 converts the thermal energy after combustion into mechanical energy to drive the crankshaft 131 to move through the connecting rod 132. The crankshaft 131 drives the cam mechanism 7 through the valve train assembly 15, thereby causing the cam mechanism 7 to open and close the intake mechanism 81 and the exhaust mechanism 82. At the same time, the crankshaft 131 drives the transmission mechanism 12, causing the transmission mechanism 12 to transmit power to the vehicle. The exhaust mechanism 82 filters the combusted exhaust gas to exhaust the exhaust gas to the atmosphere.

As shown in fig. 6 to 7, a cooling mechanism 21 is further provided in the cylinder head 2, the cooling mechanism 21 includes a cooling water channel 211 for cooling the ignition mechanism 9, and the cooling water channel 211 is distributed around the ignition mechanism 9 to facilitate cooling of the ignition mechanism 9 and improve the heat dissipation effect of the ignition mechanism 9. The cylinder head 2 comprises a through-line 29 passing through itself.

The ignition hole 22 is formed in the penetrating line 29, the ignition hole 22 penetrates through the cylinder head 2, one end of the ignition hole 22 is communicated with the cylinder head cover 1, the other end of the ignition hole 22 is communicated with the combustion chamber 16, a first communicating hole 221 is formed in one end, communicated with the cylinder head cover 1, of the ignition hole 22, and a second communicating hole 222 is formed in one end, communicated with the combustion chamber 16, of the ignition hole 22. The first communication hole 221 and the second communication hole 222 communicate with each other. The ignition hole 22 is provided therein with the ignition mechanism 9, and the center line of the ignition hole 22 substantially coincides with the through line 29, so that the ignition mechanism 9 is located at the center of the cylinder head 2, facilitating the installation of the ignition mechanism 9 in the cylinder head 2. The ignition mechanism 9 includes an ignition plug 901 and an ignition coil 902, one end of the ignition plug 901 is at least partially provided in the ignition coil 902, and the other end of the ignition plug 901 is at least partially provided at the second communication hole 222. During operation of the ignition mechanism 9, the temperature rise in the ignition hole 22 causes the air in the ignition hole 22 to expand, so that the ignition coil 902 is ejected, resulting in interruption of ignition.

As shown in fig. 6 to 8, as one implementation, the cylinder head cover 1 is provided with the vent hole 23, the vent hole 23 communicates with the ignition hole 22 and penetrates through the cylinder head cover 1, and the vent hole 23 communicates with the outer surface of the cylinder head cover 1 through the cylinder head cover 1, that is, the vent hole 23 communicates with the outside of the cylinder head cover 1 through the cylinder head cover 1. One end of the vent hole 23 is communicated with the ignition hole 22, and the other end of the vent hole 23 penetrates through the cylinder head cover 1 to be communicated with the outside and is used for discharging air and water in the ignition hole 22 to the outside of the ignition hole 22, so that the air pressure in the ignition hole 22 and the outside air pressure are balanced, the ignition mechanism 9 works stably, and ignition interruption is avoided. In addition, the structure of ignition hole 22 and ignition mechanism 9 is also adjusted, makes and can set up the bigger cooling body 21 of cross sectional area around ignition hole 22 and ignition mechanism 9 to be convenient for ignition hole 22 and ignition mechanism 9 cool off, can prevent that ignition coil 902 from being ejecting, avoids the ignition to break. Specifically, the cooling water passage 211 may extend to the second communication hole 222, thereby increasing the volume of the cooling water passage 211 at the spark plug 901, and achieving effective cooling of the spark plug 901.

In the present embodiment, one end of the vent hole 23 communicates with the ignition hole 22, the other end of the vent hole 23 communicates with the outside, one end of the vent hole 23 communicating with the ignition hole 22 is a third communication hole 231, one end of the vent hole 23 communicating with the outside is a fourth communication hole 232, and the fourth communication hole 232 is at least partially disposed on the head cover 1 and is communicated with the outer surface of the head cover 1, so that the fourth communication hole 232 communicates with the outside, thereby balancing the air pressure of the ignition hole 22 and the outside. The third communication hole 231 and the fourth communication hole 232 communicate with each other. By this arrangement, it is possible to balance the air pressure in the ignition hole 22 and to discharge the water in the ignition hole 22 by means of the water vapor, thereby facilitating the stable operation of the ignition mechanism 9. Wherein the outer surface of the cylinder head cover 1 is the surface of the cylinder head cover 1 contacting with the outside. The outer surface of the cylinder head cover 1 is provided with a plurality of mounting bolt through holes 101, an oil-gas separation area 102, a secondary air supplement area 103 and a first transmission cavity area 104, the mounting bolt through holes 101 are used for connecting the cylinder head 2 and the cylinder head cover 1, the secondary air supplement area 103 corresponds to a secondary air supplement valve mounting area, and the first transmission cavity area 104 corresponds to a mounting area of the valve transmission assembly 15. The ignition hole 22 penetrates through the cylinder head cover 1 to be communicated with the outside, the first communicating hole 221 is formed in the cylinder head cover 1, the oil-gas separation area 102, the secondary air supplement area 103 and the first transmission cavity area 104 are distributed around the first communicating hole 221, the first communicating hole 221 is formed between the oil-gas separation area 102 and the secondary air supplement area 103, the center point of the first communicating hole 221 and the center point of the first transmission cavity area 104 are basically in the same straight line, and the center point of the first communicating hole 221 is basically located on the radial center line of the cylinder head cover 1. Wherein the outer surface of the cylinder head cover 1 extends substantially along a third straight line 400, and the radial centre line of the cylinder head cover 1 refers to a radial centre line parallel to the third straight line 400.

In the present embodiment, when the engine 100 is a two-cylinder engine, that is, when the ignition mechanism 9 is two in number, the number of the ignition holes 22 is two, and the ignition holes 22 include the first ignition hole 223 and the second ignition hole 224, and the center of the first ignition hole 223 and the center of the second ignition hole 224 are both substantially on the radial center line of the head cover 1. At this time, there are at least two vent holes 23, and the vent holes 23 include a first vent hole 233 and a second vent hole 234. The first air vent 233 communicates with the first ignition hole 223 and runs through the cylinder head cover 1, and the first air vent 233 communicates to the outer surface of the cylinder head cover 1 through the cylinder head cover 1, that is, the first air vent 233 communicates to the outside of the cylinder head cover 1 through the cylinder head cover 1, thereby discharging air and water in the first ignition hole 223 to the outside of the first ignition hole 223, and further balancing the air pressure and the outside air pressure in the first ignition hole 223, so that the ignition mechanism 9 stably works, and ignition interruption is avoided. The second vent hole 234 communicates the second ignition hole 224 and runs through the cylinder head cover 1, and the second vent hole 234 communicates to the outer surface of the cylinder head cover 1 through the cylinder head cover 1, that is, the second vent hole 234 communicates to the outside of the cylinder head cover 1 through the cylinder head cover 1, thereby discharging air and water in the second ignition hole 224 to the outside of the second ignition hole 224, and further balancing the air pressure and the outside air pressure in the second ignition hole 224, so that the ignition mechanism 9 stably works, and ignition interruption is avoided.

When the engine 100 is a single cylinder engine, that is, the ignition mechanism 9 is one in number, the ignition hole 22 is one in number, and at this time, the center of the ignition hole 22 substantially coincides with the center of the head cover 1.

As one implementation manner, at least one vent hole 23 communicated with the ignition hole 22 is provided, and the vent hole 23 is oriented to meet the exhaust requirement without the orientation of the specific vent hole 23; the position of the vent hole 23 is sufficient to communicate with the outside and the ignition hole 22, and the position of the vent hole 23 is not required to be specified. In general, the direction of arrangement of the vent holes 23 is: after the engine 100 is completely mounted, one end of the communication ignition hole 22 is lower than one end communicating with the outside, that is, the distance between the third communication hole 231 and the second communication hole 222 is shorter than the distance between the fourth communication hole 232 and the second communication hole 222. The arrangement mode can improve the exhaust effect of the vent hole 23 and is beneficial to balancing the air pressure between the ignition hole 22 and the outside.

As shown in fig. 6 and 7, the spark plug 901 includes a mounting bolt 9011, a tightening hexagon 9012, and an electrode 9013. The spark plug 901 discharges a pulse high voltage from a high voltage wire, and the pulse high voltage breaks down the air between the two electrodes 9013 of the spark plug 901, thereby generating an electric spark and igniting the mixed gas in the combustion chamber 16. The mounting bolt 9011 is used for assembling with the cylinder block 3, the tightening hexagon 9012 is used for screwing or unscrewing the spark plug 901, and the electrode 9013 is used for releasing the pulse high-voltage electricity. If the length of the mounting bolt 9011 is short, the structures such as the screwing hexagon 9012 and the electrode 9013 are closer to the combustion chamber 16, so that more heat is generated, and the heat dissipation effect of the ignition mechanism 9 is affected. At this time, the spark plug 901 has only a small portion of its structure in the cooling range of the cooling water passage 211. Therefore, if the length of mounting bolt 9011 is short, the cooling effect of spark plug 901 is poor, and the temperature of ignition mechanism 9 is high, which affects the service life of ignition mechanism 9.

As shown in fig. 6 and 7, as an implementation manner, in order to improve the cooling effect of the ignition mechanism 9 in the actual operation process, the ventilation holes 23 are arranged on the cylinder head cover 1, and the structures of the ignition holes 22 and the ignition mechanism 9 are adjusted, so that the cooling mechanism 21 with a larger cross-sectional area can be arranged around the ignition holes 22 and the ignition mechanism 9, thereby facilitating the cooling of the ignition holes 22 and the ignition mechanism 9, preventing the ignition coil 902 from being ejected, and avoiding the interruption of ignition. The cooling water passage 211 may extend to the second communication hole 222, thereby increasing the volume of the cooling water passage 211 at the spark plug 901, and substantially maintaining the entire structure of the spark plug 901 within the cooling range of the cooling water passage 211. Specifically, the mounting bolt 9011 is provided in the second communication hole 222, the length of the second communication hole 222 and the length of the mounting bolt 9011 are increased, and the length of the second communication hole 222 and the diameter of the mounting bolt 9011 are decreased, so that the cooling water passage 211 can be extended to the second communication hole 222, and the cooling effect of the cooling water passage 211 on the spark plug 901 is improved. In the present embodiment, the entire structure of the hexagonal screw 9012 and the electrode 9013 of the spark plug 901 is located farther from the second communication hole 222, that is, the entire structure of the hexagonal screw 9012 and the electrode 9013 of the spark plug 901 is located farther from the combustion chamber 16, and the cooling water passage 211 extends to the second communication hole 222, so that the cooling water passage 211 has a better cooling effect on the ignition mechanism 9, and heat dissipation from the ignition mechanism 9 is facilitated. Generally, the cooling water channel 211 includes: the volume and shape of the cooling water channel 211 are determined by the installation conditions of the air intake and exhaust mechanism 8, the combustion chamber 16 and the ignition mechanism 9.

In the present embodiment, the volume of the cooling water passage 211 can be increased by providing the air holes 23 for communicating the ignition hole 22 with the outside in the cylinder head cover 1, increasing the length of the mounting bolt 9011, and the like, so that the cooling water passage 211 surrounds the ignition mechanism 9 to the maximum extent, the cooling effect of the ignition mechanism 9 is improved, and the service life of the ignition mechanism 9 is further improved. In addition, air and water in the ignition hole 22 are discharged out of the ignition hole 22 through the vent hole 23, so that air pressure in the ignition hole 22 and external air pressure can be balanced, the ignition mechanism 9 can stably work, ignition interruption is avoided, partial heat in the ignition hole 22 can be taken away through the discharge of the air and the water, and the ignition coil 902 is effectively prevented from being ejected out due to the fact that the air in the ignition hole 22 rapidly expands.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.

Claims (10)

1. An engine, comprising:

a cylinder head formed with an accommodation space;

the air intake and exhaust mechanism is at least partially arranged in the accommodating space and comprises an air intake mechanism and an exhaust mechanism, the air intake mechanism is used for air intake of the engine, and the exhaust mechanism is used for exhaust of the engine;

the cam mechanism is at least partially arranged in the accommodating space and is used for controlling the air intake and exhaust mechanism;

a head cover at least partially coupled to the cylinder head for sealing the engine;

an ignition mechanism disposed at least partially in the receiving space for igniting a combustible mixture;

it is characterized in that the preparation method is characterized in that,

the engine further includes:

a firing hole at least partially disposed in the receiving space and at least partially disposed in the cylinder head cover;

the ignition mechanism is at least partially arranged in the ignition hole;

and a vent hole is arranged between the ignition hole and the cylinder head cover, is communicated with the ignition hole and penetrates through the cylinder head cover, and is communicated to the outer surface of the cylinder head cover through the cylinder head cover.

2. The engine of claim 1, further comprising a cylinder block coupled to the cylinder head, the cylinder head being disposed between the cylinder block and the cylinder head cover; the ignition hole comprises a first communication hole and a second communication hole, the first communication hole is communicated with the cylinder head cover, and the second communication hole is communicated with the cylinder block.

3. The engine according to claim 2, characterized in that one end of the breather hole communicates with the first communication hole, and the other end of the breather hole communicates with an outer surface of the cylinder head cover.

4. The engine according to claim 3, characterized in that the breather hole includes a third communication hole and a fourth communication hole that communicate with each other, the third communication hole communicating with the ignition hole, the fourth communication hole communicating with an outer surface of the cylinder head cover.

5. The engine according to claim 4, characterized in that a distance of the third communication hole from the second communication hole is shorter than a distance of the fourth communication hole from the second communication hole.

6. The engine of claim 1, wherein said ignition holes comprise a first ignition hole and a second ignition hole; the vent holes comprise a first vent hole and a second vent hole; the first vent hole is disposed between the first ignition hole and the cylinder head cover; the second venting hole is disposed between the second ignition hole and the cylinder head cover.

7. The engine of claim 6, wherein the first vent hole communicates the first ignition hole and an outer surface of the cylinder head cover; the second vent hole communicates the second ignition hole and the outer surface of the cylinder head cover.

8. The engine of claim 2, further comprising a cooling mechanism; the cooling mechanism is at least partially disposed in the receiving space and at least partially surrounds the ignition mechanism, the cooling mechanism for cooling the ignition mechanism.

9. The engine of claim 8, wherein the ignition mechanism comprises:

a spark plug at least partially disposed in the ignition hole;

an ignition coil, said spark plug being at least partially disposed in said ignition coil;

the cooling mechanism is disposed at least partially around the spark plug.

10. The engine of claim 8, wherein the cooling mechanism extends at least partially to the second communication aperture.

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