Camshaft housing, engine and vehicle

Abstract

A vehicle, comprising an engine having a camshaft housing. The camshaft housing comprises: an ignition coil mounting hole, which is used for mounting an ignition coil and comprises a sealing section, an inner wall of the sealing section being adapted to mate with the ignition coil; and an exhaust hole provided in a side wall of the ignition coil mounting hole, the exhaust hole being located on a lower side of the sealing section and communicating the ignition coil mounting hole with the outside.

Description

Camshaft cases, engines and vehicles

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202311433842.1 and invention name “Camshaft Case, Engine and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of vehicles, and more particularly, to a camshaft case, an engine, and a vehicle. Background Art

[0003] In a vehicle's ignition system, the ignition coil is the conversion component that provides the ignition energy needed to ignite the air and fuel mixture within the engine cylinder. Based on the principle of electromagnetic induction, it converts low voltage into high voltage electricity. This high voltage electricity then passes through the spark plug, generating a high-voltage spark that ignites the combustible mixture.

[0004] As a peripheral component of the engine, the ignition coil must be protected from external liquids that could cause corrosion, while also ensuring balanced air pressure inside and outside the engine. Providing a vent hole on the ignition coil's upper stem cover provides a degree of sealing and waterproofing. However, existing vent holes often suffer from poor airflow.

[0005] Summary of the Invention

[0006] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] In view of the shortcomings of the prior art, a first aspect of an embodiment of the present invention provides a camshaft housing, comprising:

[0008] an ignition coil mounting hole, the ignition coil mounting hole being used to mount an ignition coil, the ignition coil mounting hole comprising a sealing section at an upper portion, the inner wall of the sealing section being adapted to cooperate with the ignition coil;

[0009] An exhaust hole is provided on a side wall of the ignition coil mounting hole, the exhaust hole is located on the lower side of the sealing section, and connects the ignition coil mounting hole with the outside.

[0010] In one embodiment, a top end of the ignition coil mounting hole protrudes from an upper surface of the camshaft housing to form a boss, the exhaust hole is provided on the boss, and the exhaust hole is communicated with the outside.

[0011] In one embodiment, a waterproof and breathable membrane is provided in the exhaust hole.

[0012] In one embodiment, the camshaft housing includes a plurality of ignition coil mounting holes, and the plurality of ignition coil mounting holes are arranged in a straight line; the exhaust holes of the plurality of ignition coil mounting holes are connected to each other, and at least one exhaust hole is connected to the outside.

[0013] In one embodiment, the camshaft housing includes a plurality of ignition coil mounting holes, and the plurality of ignition coil mounting holes are arranged in a straight line;

[0014] The camshaft case is further provided with an exhaust channel, which connects the exhaust holes of the plurality of ignition coil mounting holes; each exhaust hole is communicated with the outside through the exhaust channel.

[0015] In one embodiment, the exhaust passage is disposed inside the camshaft housing.

[0016] In one embodiment, a protruding structure is provided on the surface of the camshaft housing, the ignition coil mounting hole is opened on the surface of the camshaft housing, and the exhaust passage is arranged inside the protruding structure.

[0017] In one embodiment, a top end of the ignition coil mounting hole protrudes from an upper surface of the camshaft housing to form a boss, and the exhaust hole is provided on the boss.

[0018] In one embodiment, the width of the ignition coil mounting hole gradually decreases from top to bottom.

[0019] Another aspect of an embodiment of the present invention provides an engine, comprising the camshaft case as described above.

[0020] In one embodiment, the engine further includes an ignition coil, which includes a terminal, which is inserted into the ignition coil mounting hole. A sealing ring is provided on the terminal, and the sealing ring cooperates with the inner wall of the sealing section.

[0021] Yet another aspect of the embodiments of the present invention provides a vehicle, comprising the engine as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features, and advantages of the present invention will become more apparent through a more detailed description of the embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings are provided to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and are not intended to limit the present invention. In the drawings, the same reference numerals generally represent the same components or steps.

[0023] FIG1 is a cross-sectional view of a camshaft housing according to an embodiment of the present invention;

[0024] FIG2 is a perspective view of a camshaft housing according to an embodiment of the present invention;

[0025] FIG3 is a front view and a cross-sectional view of an ignition coil according to an embodiment of the present invention;

[0026] FIG4 is a cross-sectional view of a camshaft case according to another embodiment of the present invention;

[0027] FIG5 is a perspective view of a camshaft housing according to another embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application more apparent, the following is a detailed description of example embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in this application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of this application.

[0029] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, some technical features well known in the art are not described in order to avoid confusion with the present application.

[0030] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and will fully convey the scope of the present application to those skilled in the art.

[0031] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present application. When used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0032] In order to fully understand the present application, a detailed structure will be provided in the following description to illustrate the technical solution proposed by the present application. The optional embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0033] To ensure a tight seal while also discharging blowby gases from the ignition coil mounting hole, one solution is to provide ventilation holes in the ignition coil's sealing ring and ventilation grooves in the ignition coil's cover plate. This provides a degree of sealing and waterproofing. However, exhaust gas must pass through the sealing ring, which can affect exhaust flow. Furthermore, if water accumulates on the camshaft case cover and submerges the ignition coil cover plate, the accumulated water can flow through the ventilation holes into the ignition coil mounting hole. Consequently, water accumulation can easily lead to rust and damage to the ignition coil.

[0034] In response to the aforementioned problem of water accumulation on the camshaft case cover, one solution is to provide a drainage trough on the camshaft case cover, allowing the accumulated water to bypass multiple bosses from the front end and reach the drainage trough. This allows for quick and easy drainage of water after water accumulates at the top of the engine, preventing the accumulated water from entering the ignition coil mounting hole and seeping into the combustion chamber. However, in this solution, when the ignition coil is not installed, the drainage trough can achieve smooth drainage of the accumulated water at the top. However, after the ignition coil is installed, the ignition coil cover will squeeze the remaining drainage space, easily causing poor drainage from the rear end to the front end, or even making drainage impossible. When the increase in the amount of accumulated water is greater than the amount discharged by the drainage trough, the water level will inevitably rise, making it very easy for the accumulated water to be sucked back into the combustion chamber through the ignition coil exhaust hole.

[0035] The embodiments of the present invention provide a camshaft case, an engine, and a vehicle to at least partially solve the above problems. The camshaft case, the engine, and the vehicle provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

[0036] As shown in Figures 1 to 5, the camshaft case 10 of the embodiment of the present invention includes: an ignition coil mounting hole 11, which is used to mount an ignition coil 20. The ignition coil mounting hole 11 includes a sealing section 16 located at its upper portion, and the ignition coil 20 cooperates with the inner wall of the sealing section 16; the side wall of the ignition coil mounting hole 11 is provided with an exhaust hole 13, and the exhaust hole 13 is located on the lower side of the sealing section 16. The exhaust hole 13 connects the ignition coil mounting hole 11 with the outside, thereby maintaining the balance of internal and external air pressure.

[0037] In the embodiment of the present invention, an exhaust hole 13 is provided on the lower side of the sealing section 16 of the ignition coil mounting hole 11, and the exhaust does not need to pass through the sealing section 16, so the exhaust is smoother; and the sealing section 16 can be configured to cooperate with the ignition coil 20 to seal the ignition coil mounting hole 11, thereby ensuring the sealing effect and the waterproof effect.

[0038] Illustratively, the top of the ignition coil mounting hole 11 protrudes from the upper surface of the camshaft housing 10 to form a boss 12. The ignition coil 20 includes a terminal 21 and a cover plate 22 disposed on top of the terminal 21. The terminal 21 is inserted into the ignition coil mounting hole 11, and the cover plate 22 covers the boss 12. A sealing ring 23 is disposed near the top of the terminal 21. A sealing section 16 is disposed above the ignition coil mounting hole 11. The sealing ring 23 cooperates with the sealing section 16 to seal the ignition coil mounting hole 11.

[0039] For example, as shown in FIG3 , the cover plate 22 of the ignition coil 20 has a flanged lip that forms an interference fit with the boss 12 of the ignition coil mounting hole 11. A sealing ring 23 is provided near the top of the terminal 21 of the ignition coil 20. The sealing ring 23 forms an interference fit with the inner wall of the sealing section 16 of the ignition coil mounting hole 11. These two waterproof structures together prevent accumulated water from entering the ignition coil mounting hole 11. The cover plate 22 and sealing ring 23 of the embodiment of the present invention are both integrally sealed structures, eliminating the need for vent holes or vent grooves, thereby ensuring the complete sealing of the ignition coil 20.

[0040] Exemplarily, there are at least two sealing rings 23. For example, three sealing rings are provided in the example of Figure 1. At least two sealing rings 23 can further improve the sealing effect.

[0041] For example, the width of the ignition coil mounting hole 11 gradually decreases from top to bottom, that is, the sidewalls of the ignition coil mounting hole are inclined, and its longitudinal cross-section is similar to a V-shape. The ignition coil mounting hole 11 of this shape has a larger opening, which is convenient for installing the ignition coil 20.

[0042] In one embodiment, as shown in Figures 1 and 2, an exhaust hole 13 is provided on the boss 12, and its outlet is connected to the outside world. In this embodiment, the boss 12 is raised, thereby raising the position of the sealing ring 23 and reserving space below the sealing ring 23 for the exhaust hole 13. The exhaust hole 13 extends through the sidewall of the boss 12, with one end connected to the interior of the cylinder and the other end connected to the outside world. This allows blowby gases from the cylinder to be discharged to the atmosphere, maintaining pressure balance inside and outside the engine.

[0043] In this embodiment, blowby gases are discharged without passing through the sealing ring 23, resulting in smoother exhaust, effectively preventing the ignition coil 20 from swelling or dislodging due to excessive gas pressure. Furthermore, the ventilation grooves on the cover plate 22 of the ignition coil 20 and the ventilation holes on the sealing ring 23 are eliminated, preventing accumulated water from entering the engine through the ventilation grooves and holes, potentially causing misfires or coil corrosion. Furthermore, the presence of the boss 12 elevates the ignition coil 20 and the exhaust hole 13, further preventing accumulated water from entering the engine through the exhaust hole 13 and potentially backflowing into the ignition coil mounting hole 11, potentially damaging the spark plug body.

[0044] Furthermore, a waterproof breathable membrane 14 is provided within the exhaust hole 13. The waterproof breathable membrane 14 can be any semi-permeable membrane structure that is air-permeable but water-tight. This allows blowby gases from the cylinder to pass through the waterproof breathable membrane 14 and to the atmosphere. This also prevents water accumulated in the upper portion of the camshaft housing 10 from entering the engine through the exhaust hole 13, thereby preventing the accumulated water from being sucked back into the ignition coil mounting hole 11 and endangering the spark plug body.

[0045] For example, referring to Figure 1, the exhaust hole 13 can adopt a two-stage design, the first section of the exhaust hole close to the inside and the second section of the exhaust hole close to the outside have different diameters, the diameter of the first section of the exhaust hole is smaller than the diameter of the second section of the exhaust hole, and the waterproof breathable membrane 14 is arranged at the bottom of the second section of the exhaust hole, which is conducive to fixing the position of the waterproof breathable membrane 14.

[0046] In some embodiments, the camshaft housing 10 includes a plurality of ignition coil mounting holes 11 arranged in a straight line. For example, each ignition coil mounting hole 11 is provided with at least one exhaust hole 13, and the exhaust holes 13 of the plurality of ignition coil mounting holes 11 are located at the same position.

[0047] In one example, as shown in Figure 4 , the exhaust holes of multiple ignition coil mounting holes are interconnected, and at least one exhaust hole is connected to the outside. In the example of Figure 4 , each ignition coil mounting hole 11 is provided with two exhaust holes 13. These two exhaust holes 13 are arranged opposite each other and are connected to the exhaust holes 13 of adjacent ignition coil mounting holes 11 . This allows the multiple exhaust holes to be connected in series, ultimately allowing exhaust from multiple ignition coil mounting holes 11 to be uniformly discharged through the exhaust hole connected to the outside. Since most exhaust holes 13 are not directly connected to the outside, the waterproof effect is improved.

[0048] In the example of Figure 4 , the height of the boss 12 can be lowered so that the sealing ring 23 and exhaust holes 13 are located below the boss, allowing multiple exhaust holes 13 to communicate with each other within the camshaft housing 10. In some embodiments, the camshaft housing 10 is further provided with an exhaust channel 15. The exhaust holes 13 of the multiple ignition coil mounting holes 11 are connected to the exhaust channel 15, and exhaust is discharged through the exhaust channel 15 rather than directly communicating with the outside world. This further prevents accumulated water from entering the camshaft housing 10 through the exhaust holes 13. Blow-by gas from each cylinder enters the exhaust channel 15 directly and is discharged there, eliminating the need for reserved exhaust holes in the ignition coil 20 and ensuring a fully sealed ignition coil.

[0049] In one example, as shown in Figure 5, an exhaust passage 15 is provided on the surface of the camshaft housing 10. Specifically, a raised structure is provided on the surface of the camshaft housing 10, the ignition coil mounting hole is provided on the surface of the camshaft housing 10, and the exhaust passage 15 is provided within the raised structure. The raised structure can be a pipe mounted or formed on the surface of the camshaft housing 10, such as the circular pipe shown in Figure 5. Compared to placing the exhaust passage 15 inside the camshaft housing 10, placing the exhaust passage 15 on the surface of the camshaft housing 10 reduces processing difficulty. For example, the exhaust passage 15's outlet end is located at the rear end of the camshaft housing 10, thereby discharging blowby gas from the rear end of the camshaft housing 10 to the atmosphere.

[0050] When exhaust passage 15 is positioned on the surface of camshaft housing 10, exhaust holes 13 can be positioned on bosses 12, and exhaust passage 15 can be positioned on one side of one or more bosses 12, so that exhaust holes 13 of one or more ignition coil mounting holes 11 are connected to the same side of exhaust passage 15. In this embodiment, exhaust passage 15 is connected in parallel with exhaust holes 13 of multiple ignition coil mounting holes 11. Blow-by gas from each ignition coil mounting hole 11 does not pass through other ignition coil mounting holes 11, but instead independently enters exhaust passage 15. Even if blow-by gas discharge from one cylinder is blocked, it does not affect the discharge of blow-by gas from other cylinders.

[0051] Exemplarily, the exhaust passage 15 may also be arranged at other positions of the camshaft housing. For example, the exhaust passage 15 may also be arranged inside the camshaft housing, and a plurality of ignition coil mounting holes 11 may be connected in parallel inside the camshaft housing.

[0052] In summary, the camshaft case of the embodiment of the present invention is provided with an exhaust hole on the lower side of the sealing section 16 of the ignition coil mounting hole, and there is no need to provide an exhaust hole on the ignition coil, which can ensure the sealing of the ignition coil mounting hole, and the exhaust does not need to pass through the sealing section 16, and the exhaust is smoother.

[0053] Another embodiment of the present invention provides an engine comprising the camshaft case and an ignition coil as described above. The camshaft case is mounted on the engine block, sealing the cylinder from above and forming a combustion chamber, thereby preventing external impurities from entering the engine and preventing internal oil leakage. The ignition coil is a conversion component used to provide ignition energy for igniting the air and fuel mixture in the engine cylinder. It converts low voltage into high voltage electricity, which is then converted into a high-voltage spark through a spark plug, igniting the combustible mixture.

[0054] Specifically, the camshaft housing has an ignition coil mounting hole for mounting the ignition coil. The hole includes a sealing section 16, with the ignition coil mating with the sealing section 16. A vent is provided on the sidewall of the hole, located below the sealing section 16 and connecting the hole to the outside.

[0055] For example, the top of the ignition coil mounting hole protrudes from the upper surface of the camshaft housing to form a boss. The ignition coil includes a terminal, which is inserted into the ignition coil mounting hole. A sealing ring is provided near the top of the terminal, which forms an interference fit with the inner wall of the sealing section 16 of the ignition coil mounting hole. Furthermore, the ignition coil includes a cover plate disposed on the top of the terminal, which covers the boss.

[0056] In one embodiment, the exhaust hole is provided on the boss, and an air outlet of the exhaust hole is communicated with the outside.

[0057] In one embodiment, a waterproof and breathable membrane is provided in the exhaust hole, and the waterproof and breathable membrane is used to prevent accumulated water from entering the ignition coil installation hole through the exhaust hole while exhausting gas.

[0058] In another embodiment, the camshaft housing is further provided with an exhaust passage, the exhaust holes being connected to the exhaust passage, through which gas is discharged, thereby further preventing accumulated water from entering the exhaust holes. The exhaust passage can be provided inside the camshaft housing, or the camshaft housing can be provided with a raised structure on its surface, with the exhaust passage located inside the raised structure and laterally connected to the multiple ignition coil mounting holes.

[0059] In another embodiment, the camshaft housing includes a plurality of ignition coil mounting holes, which are arranged in a straight line; exhaust holes of the plurality of ignition coil mounting holes are interconnected, and at least one exhaust hole is connected to the outside.

[0060] Since the engine of the embodiment of the present invention adopts the above-mentioned camshaft case, the smoothness of exhaust from the exhaust port can be improved.

[0061] Another embodiment of the present invention provides a vehicle, comprising the engine described above. The vehicle according to the embodiment of the present invention also has similar advantages due to the use of the engine described above.

[0062] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0063] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units described is merely a logical function division. In actual implementation, other division methods may be used, such as combining or integrating multiple units or components into another device, or ignoring or not performing some features.

[0065] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0066] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0067] It will be understood by those skilled in the art that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature providing the same, equivalent, or similar purpose.

[0068] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

[0069] The various component embodiments of the present application can be implemented in hardware, or in a software module running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all of the functions of some modules according to the embodiments of the present application. The application can also be implemented as a part or all of a device program (e.g., a computer program and a computer program product) for performing the method described herein. Such a program implementing the present application can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0070] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0071] The above description is merely a specific embodiment or illustration of a specific embodiment of the present application, and the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. The scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A camshaft housing (10), characterized in that: The camshaft housing comprises: An ignition coil mounting hole (11), the ignition coil mounting hole being used to mount an ignition coil (20), the ignition coil mounting hole comprising a sealing section (16) located at an upper portion, the inner wall of the sealing section being suitable for cooperating with the ignition coil; and An exhaust hole (13) is arranged on a side wall of the ignition coil installation hole, the exhaust hole is located at the lower side of the sealing section, and connects the ignition coil installation hole with the outside.

2. The camshaft housing according to claim 1, characterized in that: The top end of the ignition coil installation hole protrudes from the upper surface of the camshaft case to form a boss (12), the exhaust hole is arranged on the boss, and the exhaust hole is communicated with the outside.

3. The camshaft housing according to claim 1 or 2, characterized in that: A waterproof and breathable membrane (14) is arranged in the exhaust hole.

4. The camshaft case according to any one of claims 1 to 3, characterized in that: The camshaft housing comprises a plurality of ignition coil mounting holes, and the plurality of ignition coil mounting holes are arranged in a straight line; The exhaust holes of the plurality of ignition coil mounting holes are connected to each other, and at least one of the exhaust holes is connected to the outside.

5. The camshaft case according to any one of claims 1 to 4, characterized in that: The camshaft housing comprises a plurality of ignition coil mounting holes, and the plurality of ignition coil mounting holes are arranged in a straight line; The camshaft case is also provided with an exhaust channel (15), wherein the exhaust channel connects the exhaust holes of the plurality of ignition coil mounting holes; each of the exhaust holes is communicated with the outside through the exhaust channel.

6. The camshaft case according to any one of claims 1 to 5, characterized in that: The exhaust passage is disposed inside the camshaft case.

7. The camshaft case according to any one of claims 1 to 6, characterized in that: The surface of the camshaft case is provided with a protruding structure, the ignition coil mounting hole is opened on the surface of the camshaft case, and the exhaust passage is arranged inside the protruding structure.

8. The camshaft case according to any one of claims 1 to 7, characterized in that: The top end of the ignition coil mounting hole protrudes from the upper surface of the camshaft case to form a boss, and the exhaust hole is arranged on the boss.

9. The camshaft case according to any one of claims 1 to 8, characterized in that: The width of the ignition coil mounting hole gradually decreases from top to bottom.

10. An engine, characterized in that: The engine comprises a camshaft case according to any one of claims 1-9.

11. The engine according to claim 10, characterized in that The engine also includes an ignition coil, which includes a terminal (21) inserted into the ignition coil installation hole, and a sealing ring (23) is provided on the terminal, and the sealing ring cooperates with the inner wall of the sealing section.

12. A vehicle, characterized in that: The vehicle comprises the engine of claim 10 or 11.

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