CN116201654A

CN116201654A - Engine and vehicle

Info

Publication number: CN116201654A
Application number: CN202310012552.3A
Authority: CN
Inventors: 汪允志
Original assignee: Jiangmen Dachangjiang Group Co Ltd
Current assignee: Jiangmen Dachangjiang Group Co Ltd
Priority date: 2023-01-05
Filing date: 2023-01-05
Publication date: 2023-06-02

Abstract

The invention relates to an engine and a vehicle, wherein the engine comprises a cylinder cover, an air inlet channel, an exhaust channel and a flow guiding mechanism, the flow guiding mechanism is arranged in the air inlet channel or a combustion chamber, and the flow guiding mechanism is used for guiding air flow in the air inlet channel to flow towards the direction close to the central axis of the cylinder cover. On the one hand, in the flow direction of the air flow, the air flow intensively flows toward the center axis direction near the cylinder head to pass through the center of the combustion chamber, the air flow is prevented from being split to the direction far away from the central axis of the cylinder cover and is offset with the air flow passing through the center of the combustion chamber; on the other hand, in the direction perpendicular to the flow direction of the air flow, the air flow does not easily flow to the two sides of the cylinder cover but intensively flows to the direction close to the central axis of the cylinder cover. Therefore, the engine and the vehicle can effectively improve the air flow intensity in the direction close to the central axis of the cylinder cover, thereby more easily forming a strong tumble flow in the center of the combustion chamber and further improving the combustion efficiency and fuel economy of the engine with little increase in cost.

Description

Engine and vehicle

Technical Field

The invention relates to the technical field of vehicle parts, in particular to an engine and a vehicle.

Background

An engine is a vehicle component capable of converting other forms of energy into mechanical energy, and currently common engines include internal combustion engines, external combustion engines, jet engines, electric motors, and the like, wherein the most widely used engine in the vehicle field is an internal combustion engine, which is a heat engine that directly converts heat energy emitted by gas or fuel into power by burning the gas or fuel inside the machine. However, combustion of conventional engines the efficiency and fuel economy are low and the fuel economy are low, resulting in higher cost of use for the vehicle.

Disclosure of Invention

Based on this, it is necessary to provide an engine and a vehicle against the problem of low combustion efficiency and fuel economy of the engine.

The technical scheme is as follows:

in one aspect, an engine is provided, including cylinder cap, intake duct, exhaust passage and guiding mechanism, the cylinder cap be equipped with the combustion chamber that supplies gas combustion, with the air inlet of combustion chamber intercommunication and with the gas vent of combustion chamber intercommunication, the intake duct with the air inlet is connected, the exhaust passage with the gas vent is connected, guiding mechanism locates the intake duct or in the combustion chamber, guiding mechanism is used for guiding the air current in the intake duct flows to being close to the axis direction of cylinder cap.

The technical scheme is further described as follows:

in one embodiment, the flow guiding mechanism includes a flow guiding boss, the flow guiding boss is disposed on one side of the air inlet channel away from the central axis of the cylinder cover, and the height of the flow guiding boss protruding from the inner wall of the air inlet channel gradually increases along the flow direction of the air flow.

In one embodiment, the flow guiding boss and the air inlet channel are of an integrally formed structure.

In one embodiment, the cylinder cover is provided with two air inlets, the number of the air inlets is two, and the air inlets are communicated with the air inlets in a one-to-one correspondence manner.

In one embodiment, the cylinder cover is provided with two exhaust ports, the number of the exhaust passages is two, and the exhaust passages are communicated with the exhaust ports in a one-to-one correspondence manner.

In one embodiment, two of the inlet channels are connected to each other at an end remote from the cylinder head.

In one embodiment, the engine comprises a valve, the valve movably penetrates through the air inlet channel or the cylinder cover and is connected with a driving mechanism, and the valve can be driven by the driving mechanism to block or open the air inlet.

In one embodiment, the area of the cross section of the valve increases gradually in the direction of flow of the air flow.

In one embodiment, the cylinder head is provided with a first connecting portion protruding, the first connecting portion defining the air inlet, the first connecting portion being connected with the air inlet duct.

In one embodiment, the cylinder head is provided with a second connecting portion protruding therefrom, the second connecting portion defining the exhaust port, the second connecting portion being connected to the exhaust passage.

In another aspect, a vehicle is provided that includes a drive mechanism coupled to an engine, and the engine.

The engine and the vehicle are provided with the flow guiding mechanism in the air inlet channel or the combustion chamber, and the flow guiding mechanism can guide the air flow in the air inlet channel to flow towards the direction close to the central axis of the cylinder cover. On the one hand, in the flowing direction of the air flow, the air flow intensively flows towards the direction of the central axis close to the cylinder cover so as to pass through the center of the combustion chamber, thereby avoiding the air flow from being split to the direction away from the central axis of the cylinder cover and being mutually offset with the air flow passing through the center of the combustion chamber; on the other hand, in the direction perpendicular to the flow direction of the air flow, the air flow does not easily flow to both sides of the cylinder head but intensively flows in the direction close to the center axis of the cylinder head. Therefore, the engine and the vehicle can effectively improve the air flow intensity in the direction close to the central axis of the cylinder cover, so that strong tumble is easier to form in the center of the combustion chamber, and the combustion efficiency and the fuel economy of the engine are improved under the condition of almost not increasing the cost.

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 invention.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an engine according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the engine of FIG. 1 taken along the direction A-A;

fig. 3 is a cross-sectional view of the engine of fig. 1 taken along the direction B-B.

Reference numerals illustrate:

100. a cylinder cover; 110. a combustion chamber; 120. an air inlet; 130. an exhaust port; 140. a first connection portion; 150. a second connecting portion; 160. a fitting hole; 200. an air inlet channel; 300. an exhaust passage; 400. a diversion mechanism; 500. a valve; 510. a connecting rod; 520. a deflector disc.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As described in the background art, an internal combustion engine is one of the main types of engines, and in order to enhance the gas flow velocity in the cylinder of the internal combustion engine and improve the combustion efficiency, it is necessary to adjust the movement of the gas flow in the combustion cylinder of the internal combustion engine to improve the combustion efficiency. Experiments show that the combustion efficiency of an internal combustion engine is mainly influenced by the movement of turbulence (airflow movement with uncertain flow direction) of gas, and in order to effectively form turbulence when flame of the internal combustion engine propagates, a common technical means is to utilize the physical characteristic that tumble (organized airflow movement perpendicular to the axis of a cylinder) breaks into turbulence in the later stage of a compression stroke to strengthen the strength of the turbulence, thereby greatly improving the circulation speed of the gas and improving the combustion efficiency of the internal combustion engine. On one hand, in the flowing direction of the air flow, part of the air flow can flow in the direction away from the central axis of the cylinder cover and offset with the air flow in the direction close to the central axis of the cylinder cover; on the one hand, in the direction perpendicular to the flow direction of the air flow, the air flow decreases in intensity in the direction close to the central axis of the cylinder head due to the flow direction to both sides of the cylinder head. Therefore, the air flow intensity of the traditional engine, which is close to the central axis direction of the cylinder cover, is lower, so that strong tumble is difficult to form in the center of the combustion chamber, the combustion efficiency and the fuel economy of the engine are lower, and the use cost of the vehicle is improved.

To solve the above problems, as shown in fig. 1 to 3, in one embodiment, there is provided an engine including a cylinder head 100, an intake port 200, an exhaust port 300, and a guide mechanism 400, wherein the cylinder head 100 is provided with a combustion chamber 110 for burning gas, an intake port 120 communicating with the combustion chamber 110, and an exhaust port 130 communicating with the combustion chamber 110, the intake port 200 is connected with the intake port 120, the exhaust port 300 is connected with the exhaust port 130, the guide mechanism 400 is provided in the intake port 200 or the combustion chamber 110, and the guide mechanism 400 is used for guiding the air flow in the intake port 200 to flow in a direction close to a central axis of the cylinder head 100.

The inner wall of the cylinder cover 100 may be a polygonal surface or a curved surface, so that pressure loss of the air flow when the air flow changes direction at the inner wall of the cylinder cover 100 is reduced, and it is ensured that the air flow can form a strong tumble in the center of the combustion chamber 110.

Wherein, the flow guiding boss can be integrally arranged with the air inlet duct 200, thereby simplifying the manufacturing process and the overall structure of the engine.

The portion of the guide boss protruding from the inner wall of the air inlet 200 is matched with the inner wall of the air inlet 200 to form an arc-shaped air flow channel, so that pressure loss of air flow when the movement direction of the air flow is changed at the guide boss is reduced, and the air is ensured to form strong tumble at the center of the combustion chamber 110.

The engine of the above embodiment is provided with the flow guiding mechanism 400 in the intake duct 200 or the combustion chamber 110, and the flow guiding mechanism 400 can guide the airflow in the intake duct 200 to flow in the direction close to the central axis of the cylinder head 100. Specifically, as shown in fig. 2 and fig. 3, fig. 2 is a schematic diagram of the flow direction of the gas in the cylinder head 100 taken along the flow direction of the gas flow, and fig. 3 is a schematic diagram of the flow direction of the gas in the cylinder head 100 taken along the flow direction of the gas flow perpendicular to the flow direction of the gas flow, wherein the line C-C is the central axis direction of the cylinder head 100, and on one hand, in the flow direction of the gas flow, the gas flow intensively flows toward the central axis direction close to the cylinder head 100 to pass through the center of the combustion chamber 110, so that the gas flow is prevented from being split to the direction far from the central axis direction of the cylinder head 100 and offset with the gas flow passing through the center of the combustion chamber 110; on the other hand, in the direction perpendicular to the flow direction of the air flow, the air flow does not easily flow to both sides of the cylinder head 100 but intensively flows in the direction close to the center axis of the cylinder head 100. As can be seen, the engine and the vehicle of the present embodiment can effectively improve the air flow intensity near the central axis direction of the cylinder head 100, so that a strong tumble flow is more easily formed in the center of the combustion chamber 110, and thus the combustion efficiency and the fuel economy of the engine are improved with little increase in cost.

It should be noted that, the "direction of the central axis of the cylinder head 100" is only for convenience of describing the present invention and simplifying the description, and does not limit the specific axially distributed external configuration of the cylinder head 100, and meanwhile, the air flow must not flow to the central axis of the cylinder head 100 in an accurate direction, and may also flow to the middle of the cylinder head 100 in a direction with a certain angle and a certain position error, so long as the core concept of the present invention is met, and therefore the "direction of the central axis of the cylinder head 100" is not to be construed as limiting the present invention.

In one embodiment, as shown in fig. 3, the flow guiding mechanism 400 includes a flow guiding boss provided on one side of the air inlet channel 200 away from the central axis of the cylinder head 100, and the height of the flow guiding boss protruding from the inner wall of the air inlet channel 200 increases gradually in the flow direction of the air flow. In this way, the portion of the guide boss protruding from the air inlet 200 may cooperate with the inner wall of the air inlet 200 to form a wedge-shaped air flow channel and guide the air flow to a side close to the central axis of the cylinder head 100, thereby improving the tumble flow strength in the center of the combustion chamber 110.

The guide boss and the cylinder head 100 may be formed by casting, and materials used for casting include, but are not limited to, cast iron, cast aluminum, and other common casting materials. In other embodiments, the flow guiding mechanism 400 may be a solid body with other structures such as a flow guiding sheet, a sleeve, a vane, or a tortuous air intake passage, so long as the airflow in the air intake passage 200 can be guided to flow in the direction close to the central axis of the cylinder cover 100.

In one embodiment, the flow directing boss is integrally formed with the inlet duct 200, thereby simplifying the air duct structure of the engine.

In one embodiment, as shown in fig. 1, the cylinder cover 100 is provided with two intake ports 120, and the number of the intake ports 200 is two, and the intake ports 200 are in one-to-one correspondence with the intake ports 120. By connecting the plurality of air inlets 200 to the cylinder cover 100, the airflows of the plurality of air inlets 200 can be converged to form a stronger airflow, so that the air inlet efficiency of the engine is improved under the condition that the total volume of the cylinder cover 100 is unchanged. Further, when the number of the air inlets 200 of the engine is large, the air inlet efficiency of the engine is high, but the overall size and weight of the engine are increased, so that the power performance of the vehicle is reduced, whereas when the number of the air inlets 200 of the engine is small, the overall size and weight of the engine are light, and the power performance of the vehicle is good, but the air inlet efficiency of the engine is low, so that the convenience and the air inlet efficiency of the engine can be effectively considered by setting the number of the air inlets 200 to two. Preferably, all of the intake ports 120 are uniformly distributed on the surface of the cylinder head 100, so that the gas pressure is uniformly distributed throughout the interior of the cylinder head 100.

Wherein, as shown in fig. 1, the ends of the two intake ports 200 away from the cylinder head 100 may communicate with each other, thereby reducing the overall volume of the engine.

In the engine of the above embodiment, as shown in fig. 2, the flow guiding mechanism 400 can make the air flow of the two air inlets 200 not easily split to the side far from the other air inlet 200 in the direction perpendicular to the movement direction of the air flow. Therefore, the air intake structure of the present embodiment not only can optimize the air flow intensity of the air flow of the single air inlet channel 200 toward the center of the combustion chamber 110, but also can optimize the air flow intensity formed by the air flow collection of the air inlets 200, and can effectively improve the combustion efficiency and the fuel economy of the multi-valve 500 engine.

In one embodiment, as shown in FIG. 1, cylinder head 100 is provided with two exhaust ports 130, and exhaust ports 300 are provided in two number, and exhaust ports 300 communicate with exhaust ports 130 in one-to-one correspondence. Wherein the number and structure of the exhaust ports 300 may be set to be the same as those of the intake ports 200, thereby facilitating the processing and installation of the vehicle.

Wherein, as shown in fig. 1, the ends of the two exhaust passages 300 remote from the cylinder head 100 may communicate with each other, thereby reducing the overall volume of the engine.

In one embodiment, as shown in fig. 3, the engine includes a valve 500, where the valve 500 is movably inserted through the intake port 200 or the cylinder head 100 and connected to a driving mechanism (not shown), and the valve 500 can be driven by the driving mechanism to block or open the intake port 120. Specifically, as shown in fig. 3, the valve 500 includes a connecting rod 510 and a guide disc 520, the connecting rod 510 is connected with the guide disc 520, the connecting rod 510 penetrates through the air inlet 200 or the cylinder cover 100 and is connected with the driving mechanism, the diameter of the guide disc 520 is matched with the aperture of the air inlet 120, and the guide disc 520 can guide the air flow in the air inlet 200 to flow in the direction close to the central axis of the cylinder cover 100. Thus, the opening and closing of the valve 500 can be controlled by adjusting the movement of the driving mechanism, thereby facilitating the control of the intake state of the engine.

Wherein, as shown in fig. 3, the area of the cross section of the valve 500 gradually increases in the flow direction of the air flow, and the area of the maximum cross section of the valve 500 matches the area of the air intake 120. In this way, the flow guide disc 520 with gradually increased cross-sectional area can cooperate with the inner wall of the air inlet 200 to form an arc-shaped air flow channel, so that pressure loss of the air when changing the movement direction of the air is reduced, and the air is ensured to form a strong tumble in the center of the combustion chamber 110.

In one embodiment, as shown in FIG. 1, the cylinder head 100 is provided with a first connecting portion 140 protruding therefrom, the first connecting portion 140 defining the intake port 120, the first connecting portion 140 being connected to the intake port 200. In another embodiment, the cylinder head is provided with a protruding second connection 150, which defines the exhaust port 130, the second connection 150 being connected to the exhaust port 300. By providing the first connecting portion 140 and the second connecting portion 150 on the surface of the cylinder head 100, it is ensured that the cylinder head 100 maintains a uniform thickness throughout the joints of the pipes, and the damage of the cylinder head 100 due to stress concentration at the joints of the pipes is prevented.

The engine according to the above embodiment is not limited to use in a vehicle, and may be used in other devices such as a construction machine, a production facility, and an air conditioner; also, the engine of the above-described embodiment is not limited to use for forming a tumble flow in the combustion chamber 110 of an automobile engine, but may be used in any situation where it is necessary to form a tumble flow.

In another aspect, a vehicle is provided that includes a drive mechanism (not shown) and an engine of any of the embodiments, the drive mechanism being coupled to the engine.

The vehicle of the above embodiment is provided with the flow guiding mechanism 400 in the air inlet 200 or the combustion chamber 110, and the flow guiding mechanism 400 can guide the air flow in the air inlet 200 to flow towards the direction close to the central axis of the cylinder cover 100, so that the air flow strength close to the central axis of the cylinder cover 100 can be effectively improved, the strong tumble flow is easier to form in the center of the combustion chamber 110, and the combustion efficiency and the fuel economy of the engine are improved under the condition of almost not increasing the cost.

Specifically, the drive mechanism includes a cam shaft that is provided coaxially with the valve 500, the cam shaft being capable of reciprocating in the axial direction of the valve 500. When the camshaft moves away from the cylinder head 100, the valve 500 is lifted, thereby opening the intake passage; when the camshaft moves closer to the cylinder head 100, the valve 500 is driven to sink, thereby closing the intake passage. In other embodiments, the driving mechanism may also be a worm gear, a controlled piston rod, and the like, and only needs to be capable of driving the valve 500 to move.

Further, on the basis of the embodiment, as shown in fig. 2, the vehicle further includes a spark plug, and the cylinder head 100 is provided with a fitting hole 160 for fitting the spark plug for introducing high-voltage electricity into the combustion chamber 110 and igniting the gas.

The "body" and "certain portion" may be a part of the corresponding "member", that is, the "body" and "certain portion" are integrally formed with the other portion of the "member"; or a separate component which is separable from the other part of the component, namely, a certain body and a certain part can be independently manufactured and then combined with the other part of the component into a whole. The expressions of "a body" and "a portion" are merely examples, which are intended to facilitate reading, but not to limit the scope of protection of the present application, so long as the features described above are included and the actions are the same, it should be understood that the invention is equivalent to the technical solutions described herein.

It should be noted that the components included in the "units", "assemblies", "mechanisms" and "devices" of the present application may be flexibly combined, i.e. may be produced in a modularized manner according to actual needs, so as to facilitate modularized assembly. The above-mentioned components are only one embodiment, and for convenience of reading, not limitation of the scope of protection of the present application, so long as the above components are included and the same function should be understood as the equivalent technical solutions of the present application.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. The term "and/or" as used in this invention includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "mounted," "positioned," "secured" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as "fixed transmission connection" and the other element, the two elements may be fixed in a detachable connection manner, or may be fixed in a non-detachable connection manner, so that power transmission can be achieved, for example, sleeving, clamping, integrally forming, fixing, welding, etc., which may be achieved in the prior art, and will not be described herein. When an element is perpendicular or nearly perpendicular to another element, it is meant that the ideal conditions for both are perpendicular, but certain vertical errors may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

It will be further understood that when interpreting the connection or positional relationship of elements, although not explicitly described, the connection and positional relationship are to be interpreted as including the range of errors that should be within an acceptable range of deviations from the particular values as determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, and is not limited herein.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An engine, the engine comprising:

the cylinder cover is provided with a combustion chamber for gas combustion, an air inlet communicated with the combustion chamber and an air outlet communicated with the combustion chamber;

the air inlet is connected with the air inlet;

the exhaust passage is connected with the exhaust port; and

the flow guiding mechanism is arranged in the air inlet channel or the combustion chamber and is used for guiding air flow in the air inlet channel to flow towards the direction close to the central axis of the cylinder cover.

2. The engine according to claim 1, wherein the flow guide mechanism includes a flow guide boss provided on a side of the intake duct away from a central axis of the cylinder head, and a height of the flow guide boss protruding from an inner wall of the intake duct gradually increases in a flow direction along the airflow.

3. The engine of claim 2, wherein the flow directing boss is of unitary construction with the inlet duct.

4. The engine of claim 1, wherein the cylinder cover is provided with two air inlets, the number of the air inlets is two, and the air inlets are communicated with the air inlets in a one-to-one correspondence.

5. The engine of claim 4, wherein two of said inlet ports communicate with each other at an end remote from said cylinder head.

6. The engine according to claim 1, wherein the cylinder head is provided with two exhaust ports, the number of the exhaust passages is two, and the exhaust passages are communicated with the exhaust ports in one-to-one correspondence.

7. The engine of claim 1, comprising a valve movably extending through the intake port or the cylinder head and connected to a drive mechanism, the valve being capable of blocking or unblocking the intake port under the drive of the drive mechanism.

8. The engine of claim 7, wherein the cross-sectional area of the valve increases gradually in a flow direction along the airflow.

9. The engine of claim 1, wherein the cylinder head is provided with a first connecting portion protruding therefrom, the first connecting portion defining the intake port, the first connecting portion being connected to the intake port; and/or, the cylinder cover is convexly provided with a second connecting part, the second connecting part limits the exhaust port, and the second connecting part is connected with the exhaust passage.

10. A vehicle comprising a drive mechanism and an engine as claimed in any one of claims 1 to 9, the drive mechanism being coupled to the engine.