Timing cover, engine, and vehicle

Abstract

The application provides a timing cover, an engine and a vehicle. A cover body of the timing cover comprises an inner side and an outer side. The inner side is connected with a crankcase and defines a cavity for accommodating blow-by gas. The cover body has a first through hole for air supplementing the cavity. The first through hole has a first end and a second end. The first end is communicated to the outer side to receive external air. The second end is communicated to the inner side to supplement air to the cavity. The timing cover of the application has an internal air supplementing channel through the first through hole. No separate external air supplementing pipeline is needed. The peripheral arrangement of the engine is simplified, and the cost of the engine is reduced. Meanwhile, since the air supplementing channel is internal, the external air contacts the timing cover and the internal air when passing through the first through hole, and is preheated. The preheating process can reduce the temperature difference between the external air and the gas in the crankcase, and avoid the generation of condensed water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and more particularly to a crankcase air supplementing system, an engine and a vehicle. BACKGROUND

[0002] At present, the crankcase will produce combustion residues, oil vapor and other blow-by gas during the working process. These blow-by gas needs to be timely discharged, and the air in the crankcase will also be diluted, resulting in a decrease in oxygen content. In order to keep the air inside the crankcase fresh and meet the oxygen required by the combustion process of the internal combustion engine, fresh air needs to be introduced for air supplementing. The existing crankcase air supplementing scheme generally directly sets an air supplementing hole on the crankcase to directly introduce fresh air into the crankcase. Since there is a temperature difference between the fresh air and the blow-by gas, it is easy to cause the generation of condensed water, which affects the quality of the oil in the oil pan at the bottom of the crankcase.

[0003] Therefore, it is necessary to provide a crankcase air supplementing system, an engine and a vehicle to at least partially solve the above problems. SUMMARY

[0004] A series of concepts in simplified form are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, and even less to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, the first aspect of the present application provides a timing cover, comprising:

[0006] a cover body, the cover body comprising an inner side and an outer side, the inner side being connected with the crankcase and defining a cavity for accommodating blow-by gas; wherein,

[0007] the cover body has a first through hole for air supplementing to the cavity, the first through hole having a first end and a second end, the first end being communicated to the outer side to receive ambient air, and the second end being communicated to the inner side to supplement air to the cavity.

[0008] According to the crankcase air charging system of the first aspect of the application, the inner side of the timing cover body defines a cavity for accommodating blow-by gas, and the timing cover body is provided with a first through hole, so that air charging of the crankcase can be achieved. The air charging passage is arranged in the first through hole, and no separate external air charging pipeline is needed, so that the peripheral arrangement of the engine is simplified, and the cost of the engine is reduced. At the same time, since the air charging passage is arranged internally, when the external atmosphere passes through the first through hole, the external atmosphere is in contact with the timing cover and the internal air, and is preheated. This preheating process can reduce the temperature difference between the external atmosphere and the internal gas of the crankcase, and can avoid the generation of condensed water. The timing cover of the application is provided with only the first through hole, which can preheat the intake air while achieving air charging, avoids redundant design, and improves the reliability and durability of the engine.

[0009] Optionally, a one-way valve is further included, and the one-way valve is arranged in the first through hole.

[0010] Optionally, the cover body is provided with a second through hole for mounting an oil level gauge, and the second through hole penetrates the inner side and the outer side of the cover body; wherein,

[0011] The second through hole is in communication with the second end portion, and the second end portion is in communication with the cavity through the second through hole.

[0012] Optionally, the timing cover includes a first portion and a second portion arranged in a vertical direction, the first portion is used for connecting with a cylinder head, the second portion is used for connecting with a crankcase, and the inner side of the second portion defines a cavity for accommodating blow-by gas with the crankcase;

[0013] The first through hole and the second through hole are arranged in the first portion;

[0014] The timing cover further includes a conduit arranged in the inner side of the cover body, one end of the conduit is inserted into the second through hole, and the other end of the conduit extends to the inner side of the second portion.

[0015] Optionally, the second through hole is arranged at the top of the first portion and penetrates the first portion in the vertical direction.

[0016] Optionally, along the length direction of the second through hole, the conduit is lower than the second end portion.

[0017] Optionally, the outer wall of the conduit is in sealing connection with the second through hole.

[0018] The second aspect of the application provides an engine, which includes a crankcase and the timing cover described above, and the timing cover is connected with the crankcase.

[0019] According to the engine of the second aspect of the present application, the timing cover provided with the air supplement mechanism can improve the engine performance, help control the engine internal pressure, reduce the influence of the condensate water of pollutants on the engine interior, and thus can improve the reliability and service life of the engine.

[0020] Optionally, the timing cover comprises a cover body, an inner side of the cover body is connected with the crankcase and defines a cavity for accommodating the blow-by gas, the cover body comprises a first through hole for supplementing air to the cavity and a second through hole for mounting an oil level gauge, the second through hole penetrates the inner side and the outer side of the cover body, the first through hole has a first end and a second end, the first end is communicated to the outer side to receive external air, and the second end is communicated with the second through hole, and the first through hole is communicated to the cavity through the second through hole.

[0021] The engine further comprises an oil level gauge, the oil level gauge is inserted into the second through hole, and a top end of the oil level gauge is sealingly connected with the second through hole along the length direction of the second through hole.

[0022] Optionally, the engine further comprises a cylinder head, a cylinder head cover and an intake system, the cylinder head cover, the cylinder head and the crankcase are sequentially arranged in the up-down direction, and a ventilation passage is formed in the cylinder head cover, wherein,

[0023] The inlet end of the ventilation passage is communicated with the cavity, and the outlet end is communicated with the air inlet end of the intake system.

[0024] The third aspect of the present application provides a vehicle comprising the engine described above.

[0025] The vehicle according to the third aspect of the present application has higher fuel economy, increased driving force and power performance, prolonged engine life and improved driving comfort. BRIEF DESCRIPTION OF DRAWINGS

[0026] The following drawings of the embodiments of the present application are hereby incorporated into the present application as part of the present application for the purpose of understanding the present application. The embodiments of the present application and their description shown in the drawings are used to explain the principles of the present application. In the drawings,

[0027] Figure 1 A timing cover which is a preferred embodiment of the present application.

[0028] REFERENCE NUMERALS

[0029] 10: timing cover

[0030] 11: first through hole

[0031] 111: first end

[0032] 112: second end

[0033] 12: second through hole

[0034] 20: oil level gauge

[0035] 21: conduit

[0036] 22: first seal

[0037] 23: second seal

[0038] 30: one-way valve

[0039] 40: crankcase

[0040] 50: oil sump DETAILED DESCRIPTION

[0041] In the following description, numerous specific details are given to provide a thorough understanding of the application. However, it will be apparent that the application can be practiced without one or more of the specific details. In other instances, well-known techniques are not described in detail in order to avoid obscuring the application.

[0042] In this document, ordinal numbers such as "first" and "second" are used merely to identify and do not imply any specific order or precedence. Also, the use of the term "first component" does not imply the existence of a "second component", and the use of the term "second component" does not imply the existence of a "first component".

[0043] In this document, "upper", "lower", "front", "back", "left", "right", and the like are used to describe relative positions between the relevant parts, and do not limit the absolute positions of the relevant parts.

[0044] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use, etc.

[0045] Unless otherwise stated, numerical ranges in this document include the entire range between the two endpoints, as well as several sub-ranges contained therein.

[0046] In the present application, the engine at least includes a timing cover, a cylinder block. Wherein, the timing cover is located at the front of the engine cylinder block, the timing cover is a cover installed above the timing chain or timing belt of the engine, used to protect the timing system. The cylinder block is used to accommodate the components of the cylinder and piston, and the cylinder block at least includes a cylinder head cover, a cylinder head, a crankcase. The cylinder head is a component connected above the engine cylinder block, the cylinder head cover is a cover installed above the cylinder head, and the crankcase is the bottom shell of the engine cylinder block, used to accommodate the components of the crankshaft, connecting rod, piston, etc. The oil pan is also included in the crankcase, used to store the engine oil. For easy understanding, Figure 1 In the present application, only the timing cover 10, the crankcase 40, and the oil pan 50 are shown, and other components of the engine are omitted.

[0047] As shown in Figure 1 The present application provides a timing cover, and in the present application, the timing cover is used to connect with the crankcase. The cover body of the timing cover 10 includes an inner side and an outer side, wherein the inner side is connected with the crankcase and defines a cavity for accommodating blow-by gas. A first through hole 11 for supplementing air to the cavity is provided on the timing cover 10. The first through hole 11 has a first end portion 111 and a second end portion 112. The first end portion 111 is communicated to the outer side to receive external air, and the second end portion 112 is communicated to the inner side to supplement air to the cavity. In the present application, the air supplement channel is built-in by means of the first through hole 11, without the need for a separate external air supplement pipeline, which simplifies the peripheral arrangement of the engine and reduces the cost of the engine. At the same time, since the air supplement channel is built-in, the external atmosphere contacts the timing cover 10 with a higher temperature and the surrounding internal air with a higher temperature when passing through the timing cover 10. This contact can gradually increase the temperature of the external atmosphere, making it close to or reaching the temperature inside the crankcase. Through the preheating process, the temperature difference between the external atmosphere and the gas inside the crankcase 40 can be reduced, and if the temperature is relatively low and the temperature difference with the gas inside the crankcase 40 is relatively large, it is possible to cause the formation of condensed water. By increasing the temperature of the external atmosphere through the preheating process, the temperature difference with the gas inside the crankcase is reduced, thereby reducing the risk of condensed water formation, which helps to keep the inside of the crankcase 40 dry and improve its reliability and performance.

[0048] In some embodiments of the present application, the timing cover 10 is also provided with a one-way valve 30 installed in the first through hole 11. The provision of the one-way valve 30 can ensure that external air is only introduced when needed, avoiding unnecessary introduction of external air into the air supplement channel.

[0049] In some embodiments of the present application, the cover body 10 is provided with a second through hole 12 for mounting the oil level gauge 20. The second through hole 12 penetrates the inner side and the outer side of the cover body. The second through hole 12 communicates with the second end portion 112, and the second end portion 112 communicates to the cavity through the second through hole 12. It can be understood that the oil level gauge 20 is mounted in the second through hole 12, and the oil level gauge 20 has a certain gap with the inner wall of the second through hole 12, so that the second through hole 12 communicates with the first through hole 11, and in turn the external atmosphere can be introduced from the one-way valve 30, and then into the first through hole 11 and the second through hole 12. In the present application, the timing cover 10 is covered on the engine cylinder block, the timing cover 10 is provided with the oil level gauge 20, the oil level gauge 20 is used to measure the oil quantity of the engine oil in the oil sump 50, and when the timing cover 10 is mounted with the oil level gauge 20, a corresponding mounting structure (i.e. the second through hole 12) needs to be provided. The second through hole 12 provided in the present application communicates with the first through hole 11, and through the provision of the first through hole 11 and the second through hole 12, a channel for providing external atmosphere to the crankcase 40 is formed. By means of the existing oil level gauge mounting structure, the present application realizes the air supplementing of the crankcase 40 by additionally providing the first through hole 11 and the one-way valve 30, and the air supplementing channel is arranged in the engine body, which occupies less external space.

[0050] In some embodiments of the present application, the timing cover 10 comprises a first portion and a second portion spaced in the up-down direction, the first portion is configured to be connected with the cylinder head, and the second portion is configured to be connected with the crankcase 40, and the inner side of the second portion defines a cavity with the crankcase 40 for accommodating the blow-by gas. The first through hole 11 and the second through hole 12 are both arranged in the first portion. The timing cover 10 further comprises a conduit 21 arranged in the inner side of the cover body, one end of the conduit 21 is inserted into the second through hole 12, and the other end of the conduit 21 extends to the inner side of the second portion. In the present embodiment, the conduit 21 guides the intake of the second through hole 12 into the crankcase 40, thereby guiding the flow direction of the make-up gas. The oil level gauge 20 is inserted into the conduit 21. In the present embodiment, the conduit 21 is in communication with the cavity. The arrangement of the conduit 21 prolongs the path of the external atmosphere before entering the crankcase 40. During normal operation of the engine, the high-temperature gas in the combustion chamber and friction will cause the temperature of the engine components to rise, causing the temperature of the oil used for cooling and lubrication to rise, and in turn causing the temperature of the oil level gauge 20 used to measure the oil level to rise, and the temperature around the oil level gauge 20 also rises, so that the external atmosphere comes into close contact with the oil level gauge 20 when flowing through the first through hole 11, thereby causing the temperature of the external atmosphere to also rise. Through the arrangement of the conduit 21, the contact area and time of the external atmosphere with the oil level gauge 20 is prolonged, causing the temperature of the external atmosphere to further rise. On the other hand, the conduit 21 prolongs the length of the first through hole 11, thereby prolonging the support structure of the oil level gauge 20, enabling it to work stably. In a preferred embodiment, along the length direction of the oil level gauge 20, the bottom end of the conduit 21 extends to the cavity accommodating the blow-by gas, and the bottom end of the oil level gauge 20 extends outside the conduit 21, more specifically, the bottom end of the oil level gauge 20 extends into the oil sump.

[0051] In some embodiments of the present application, the second through hole 12 is arranged at the top of the first portion and penetrates the first portion in the up-down direction. That is, the second through hole 12 penetrates the top of the timing cover 10, so that the conduit 21 arranged in the second through hole 12 can extend to the cavity, and the oil level gauge 20 arranged in the conduit 21 can extend to the oil sump.

[0052] On the basis of the above embodiment, the top end of the conduit 21 is lower than the second end 112 along the length direction of the second through hole 12. In this embodiment, the conduit 21 has higher independence, convenient installation, and relatively low manufacturing cost. It can be understood that in other embodiments, the top end of the conduit 21 can be higher than the first through hole 11, at this time, an air inlet end needs to be opened on the side wall of the conduit 21, and the air inlet end needs to be flush with the first through hole 11, and the air inlet end is not less than the first through hole 11 to ensure the maximum air intake efficiency. In this embodiment, the conduit 21 has a larger effective area for the oil level gauge 20 and can provide stable support for the oil level gauge 20. In the air supplement channel formed by the foregoing embodiment, when the air supplement cavity needs to be in a negative pressure state, the one-way valve 30 plays a key role. The one-way valve 30 guides fresh air from the outside into the first through hole 11 in a one-way manner, and then into the crankcase 40 through the second through hole 12 and the oil level gauge conduit 21. Without the need to set up a power supply device, the crankcase 40 can timely obtain fresh air supplement, and the fresh air can be preheated during the air supplement process. Therefore, through the setting of the air supplement channel of the present application, the normal working state of the crankcase 40 can be maintained, and the working condition of the crankcase 40 can be improved; at the same time, the exhaust gas in the crankcase 40 can be more smoothly discharged, avoiding the accumulation of exhaust gas in the crankcase 40, affecting the sealing and lubrication effect, and reducing the corrosion and damage of pollutants to the crankcase 40 and internal components.

[0053] On the basis of the above embodiment, the outer wall of the conduit 21 is in sealing connection with the second through hole 12. The inner wall of the conduit 21 is spaced apart from the oil level gauge 20. The sealing between the outer wall of the conduit 21 and the second through hole 12 can be one or more of rubber sealing, metal sealing, threaded sealing, and welding sealing. Specifically, the rubber sealing is a sealing ring or O-ring made of rubber or rubber-like material, which is installed on the outer wall of the conduit 21 or the inner wall of the second through hole 12, and achieves the sealing effect through compression and elastic deformation. The metal sealing is a gasket or packing made of metal, which is placed between the outer wall of the conduit 21 and the second through hole 12, and achieves the sealing effect through deformation of the metal gasket or filling of the packing. The threaded sealing is achieved by tightly fitting the threaded structures on the outer wall of the conduit 21 and the inner wall of the second through hole 12, so that they are clamped together to form a sealing effect. The welding sealing is to weld or high-temperature sinter the outer wall of the conduit 21 and the inner wall of the second through hole 12, so as to form a permanent sealing connection. For example, Figure 1As shown, the outer wall of the conduit 21 is provided with an annular groove, and a second sealing member 23 is arranged in the annular groove. The conduit 21 is sealingly connected to the second through hole 12 through the second sealing member 23. Preferably, the second sealing member 23 is a sealing ring made of rubber or rubber-like material. By sealingly connecting the outer wall of the conduit 21 to the second through hole 12, the leakage of gas can be effectively prevented, the effectiveness of the air supplement channel is ensured, and the good sealing performance of the crankcase 40 is maintained. At the same time, when maintenance or replacement is required, the connection between the conduit 21 and the second through hole 12 only needs to be released, so that the operation can be conveniently performed, and the time and labor cost in the maintenance process are reduced.

[0054] On the basis of the above-mentioned embodiment, the conduit 21 extends to the bottom of the timing cover 10 and communicates to the cavity. In the present application, the timing cover 10 is located above the oil pan 50, i.e. the bottom end of the conduit 21 is located above the oil to be measured. The conduit 21 provides a safe and convenient connection structure for the oil level gauge 20, so that the oil level gauge 20 can be accurately inserted into the oil pan 50 to measure the amount of oil. The end of the conduit 21 is located above the oil to be measured, does not occupy the volume of the oil, and ensures the accuracy of the measurement. At the same time, the air supplement channel can be extended, so that the introduced air can be preheated as efficiently as possible, the temperature difference between the fresh air and the gas in the crankcase 40 is reduced, the sharp temperature change between the cold and the hot is avoided, and the formation of condensed water is reduced. By preheating the fresh air, the temperature of the fresh air is close to the temperature in the crankcase 40, and the generation of condensed water is reduced. In addition, the outlet end of the extended conduit 21 is closer to the crankcase 40, and the efficient introduction of fresh air is achieved.

[0055] The present application also provides an engine, a crankcase and the timing cover 10 described above, wherein the timing cover 10 is connected to the crankcase 40.

[0056] In some embodiments of the present application, the timing cover 10 comprises a cover body, an inner side of the cover body is connected with the crankcase 40 and defines a cavity for accommodating blow-by gas, the cover body comprises a first through hole 11 for air supplementing to the cavity and a second through hole 12 for mounting the oil dipstick 20, the second through hole 12 penetrates the inner side and the outer side of the cover body, the first through hole 11 has a first end 111 and a second end 112, the first end 111 is communicated to the outer side to receive ambient air, the second end 112 is communicated with the second through hole 12, and the first through hole 11 is communicated to the cavity through the second through hole 12. In the engine, the oil pan 50 is located below the timing cover 10 and the crankcase 40. In the normal working state, the bottom end of the oil dipstick 20 is located inside the oil pan 50. The scale marks or liquid level lines on the oil dipstick 20 show the actual height of the oil in the oil pan 50, thereby determining the amount of oil in the oil pan 50. In this embodiment, the oil plays a role of lubrication in the engine, and the friction of the internal parts of the engine generates heat, which is transferred to the oil, and the oil cools the engine by absorbing and transferring heat.

[0057] The engine further comprises the oil dipstick 20, the oil dipstick 20 is inserted into the second through hole 12 and the top end of the oil dipstick 20 is sealingly connected with the second through hole 12 along the length direction of the second through hole 12. The bottom end of the second through hole 12 is spaced apart from the oil dipstick 20 along the length direction of the oil dipstick 20 (i.e., the middle part of the oil dipstick 20 is spaced apart from the second through hole 12), and the bottom end of the oil dipstick 20 extends into the oil pan. As known from the above embodiment, the second through hole 12 is provided with the conduit 21, and the outer wall of the oil dipstick 20 is spaced apart from the inner wall of the conduit 21. In this embodiment, the oil dipstick 20 comprises an oil dipstick body and an oil dipstick handle, the oil dipstick handle is sealingly connected with the second through hole 12, and the end of the oil dipstick body away from the oil dipstick handle extends into the oil to be measured. The sealing between the oil dipstick handle and the second through hole 12 can be one or more of rubber sealing, metal sealing, threaded sealing and welding sealing. Figure 1As shown, the outer wall of the oil dipstick handle is provided with an annular groove, and a first sealing element 22 is arranged in the annular groove. The oil dipstick handle is sealingly connected to the second through hole 12 through the first sealing element 22. Preferably, the first sealing element 22 is a sealing ring made of rubber or rubber-like material. The diameter of the oil dipstick handle is greater than the diameter of the oil dipstick body. The large diameter of the oil dipstick handle facilitates the installation of the oil dipstick and provides conditions for the sealing connection of the oil dipstick. The sealing connection of the oil dipstick handle and the second through hole 12 ensures the relative sealing of the cavity. The sealing connection of the oil dipstick handle and the second through hole 12 can maintain the upright posture of the oil dipstick 20, avoid excessive inclination during measurement, and affect the accuracy of the measurement results. It can be understood that the port connected by the first through hole 11 and the second through hole 12 is located below the oil dipstick handle, i.e., the first through hole 11 is in the part of the second through hole 12 that is not sealingly connected to the oil dipstick 20, so that air can smoothly enter the second through hole 12 from the first through hole 11. The bottom end of the oil dipstick 20 extends into the oil sump 50 and is inserted into the oil. The scale marks or liquid level lines on the oil dipstick 20 will show the actual height of the oil in the oil sump 50, and thus determine the amount of oil in the oil sump 50. The oil dipstick 20 is usually made of metal and has good thermal conductivity. As the temperature of the oil rises, the temperature of the oil dipstick 20 also rises. The outside air introduced by the one-way valve 30 exchanges heat with the oil dipstick 20 with a higher temperature when flowing through the first through hole 11, thereby reducing the temperature inside the engine and preheating the fresh air.

[0058] In some embodiments of the present application, a cylinder head, a cylinder head cover and an intake system are also included. The cylinder head cover, the cylinder head and the crankcase 40 are arranged in sequence in the up-down direction. A ventilation passage is formed in the cylinder head cover, wherein the inlet end of the ventilation passage is communicated with the cavity, and the outlet end is communicated with the air inlet end of the intake system. In the present application, the intake system is used to introduce air and deliver it to the engine cylinder for combustion. In the application, the intake system is located at the top or side of the engine, close to the cylinder block and the cylinder head cover. A ventilation passage is formed in the cylinder head cover, wherein the inlet end of the ventilation passage is communicated with the cavity, and the outlet end is communicated with the air inlet end of the intake system.

[0059] In the engine of the present application, by supplementing fresh air to the crankcase 40, the oxygen content in the crankcase 40 can be increased, thereby improving the combustion process, helping to improve the engine combustion efficiency and increase power output, thereby improving the performance and driving force of the engine. The crankcase air supplementing system can help effectively control the gas pressure in the crankcase 40, avoid the negative impact of excessive or low gas pressure on the engine, and provide the right amount of fresh air through the air supplementing system, which helps to maintain the normal working state of the engine and improve its reliability and durability. The crankcase air supplementing system facilitates the smoother exhaust of exhaust gas in the crankcase 40, reduces the corrosion and damage of pollutants to the crankcase 40 and internal components, and prolongs the service life of the engine. The crankcase air supplementing system avoids the generation of condensed water by preheating the introduced fresh air, maintains the cleanliness and normal operation of the crankcase 40, and prolongs the service life of the engine.

[0060] The present application also provides a vehicle using the above-mentioned engine.

[0061] In the vehicle of the present application, the engine with the above-mentioned timing cover can provide higher fuel economy, optimize combustion efficiency, and increase power output, so that the vehicle consumes less fuel under the same driving conditions, thereby reducing fuel costs and reducing carbon emissions. The arrangement of the timing cover vent structure improves the airflow of the engine, provides more sufficient oxygen supply, and can improve the driving force and power of the vehicle. The arrangement of the timing cover vent structure helps to maintain the cleanliness and health of the engine, helps to reduce the risk of engine wear and failure, and prolongs the service life of the engine. By improving the power output and response performance, the vehicle is easier to cope with various driving conditions, and is more stable and smooth during starting, accelerating and driving, increasing the comfort and pleasure of driving.

[0062] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used herein, the term "arrangement" can mean that a component is directly attached to another component, or that a component is attached to another component through an intermediate component. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the features are not applicable to the other embodiment or are otherwise stated.

[0063] The application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the application to the scope of the described embodiments. Those skilled in the art can understand that more kinds of variations and modifications can also be made according to the teachings of the application, which all fall within the scope of the application claimed.

Claims

1. A timing cover for connection with a crankcase, characterised in that, The timing cover comprises a cover body, the cover body comprises an inner side and an outer side, the inner side is connected with the crankcase and defines a cavity for accommodating blow-by gas; wherein, the cover body has a first through hole for air supplementing to the cavity, the first through hole has a first end and a second end, the first end is communicated to the outer side to receive ambient air, and the second end is communicated to the inner side to supplement air to the cavity; the cover body has a second through hole for mounting an oil level gauge, the second through hole penetrates the inner side and the outer side of the cover body; wherein, the second through hole is communicated with the second end, and the second end is communicated to the cavity through the second through hole; the first through hole and the second through hole are configured so that ambient air flowing therebetween is preheated by the cover body. A one-way valve is further arranged in the first through hole.

2. The timing cover of claim 1, wherein, The timing cover comprises a first part and a second part arranged in a vertical direction, the first part is used for connecting with the cylinder head, the second part is used for connecting with the crankcase, and the inner side of the second part defines a cavity for accommodating blow-by gas with the crankcase; 3. The timing cover of claim 2, wherein, the first through hole and the second through hole are arranged in the first part; the timing cover further comprises a conduit in the inner side of the cover body, one end of the conduit is inserted into the second through hole, and the other end of the conduit extends to the inner side of the second part. The second through hole is arranged at the top of the first part and penetrates the first part in the vertical direction.

4. The timing cover of claim 3, wherein, Along the length direction of the second through hole, the conduit is lower than the second end.

5. The timing cover of claim 4, wherein, The outer wall of the conduit is sealingly connected with the second through hole.

6. The timing cover of claim 4, wherein, The engine comprises a crankcase and the timing cover according to any one of claims 1 to 6, and the timing cover is connected with the crankcase.

7. An engine characterized by, The timing cover comprises a cover body, the inner side of the cover body is connected with the crankcase and defines a cavity for accommodating blow-by gas, the cover body comprises a first through hole for air supplementing to the cavity and a second through hole for mounting an oil level gauge, the second through hole penetrates the inner side and the outer side of the cover body, the first through hole has a first end and a second end, the first end is communicated to the outer side to receive ambient air, the second end is communicated with the second through hole, and the first through hole is communicated to the cavity through the second through hole; 8. The engine of claim 7, wherein The engine further comprises an oil level gauge, the oil level gauge is inserted into the second through hole, and along the length direction of the second through hole, the top end of the oil level gauge is sealingly connected with the second through hole. The engine further comprises a cylinder head, a cylinder head cover and an intake system, the cylinder head cover, the cylinder head and the crankcase are arranged in a vertical direction, and the cylinder head cover is provided with a ventilation passage, wherein, 9. The engine of claim 7, wherein the inlet end of the ventilation passage is communicated with the cavity, and the outlet end is communicated with the air inlet end of the intake system. The engine according to any one of claims 7 to 9 is further included.

10. A vehicle characterized by comprising: ​

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