Cylinder cover assembly and engine

Abstract

The utility model discloses a cylinder cover assembly and an engine, and the cylinder cover assembly comprises a cylinder cover, a cylinder cover air inlet channel, a cylinder cover air outlet channel and a cylinder cover air outlet channel, the cylinder head cover is installed on the cylinder head, the oil-gas separator is installed on the cylinder head cover, a cylinder head cover gas inlet channel is formed in the cylinder head cover, a small-load channel is formed in the oil-gas separator, and the cylinder head cover gas inlet channel is communicated with the small-load channel; wherein the cylinder head cover is provided with a cylinder head cover installation face used for being connected with a cylinder head, the cylinder head cover air inlet channel is provided with an air outlet formed in the cylinder head cover installation face, the air outlet is communicated with the cylinder head air inlet channel, the cylinder head cover installation face is provided with at least one sealing cavity, and the sealing cavity is located on the outer side of the air outlet. According to the cylinder cover assembly, the sealing performance of the joint of the cylinder cover air inlet channel and the cylinder cover air inlet channel is good, gas leakage is reduced, gas circulation is smooth, the problem of uneven pressure caused by gas leakage is solved, stable operation of an engine is effectively guaranteed, and the reliability of the engine is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially relates to a cylinder cover assembly and engine with the cylinder cover assembly. BACKGROUND

[0002] When the engine is in a small load condition, the engine speed is low, and the airflow can be weak, if the crankcase ventilation system (i.e. commonly known as the small load channel) is designed unreasonably or the working state is poor, the oil-gas mixture is unevenly distributed among the cylinders, which may cause poor airflow in some areas and uneven pressure, which will cause local high pressure in the crankcase ventilation system blow-by channel, leakage occurs, the small load channel of the cylinder cover and the cylinder cover channel combination surface are prone to oil leakage problems, and there is room for improvement. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art is solved. To this end, the utility model provides a cylinder cover assembly, the sealing property of the connecting place of the cylinder cover inlet passage and the cylinder inlet passage is good, gas leakage is reduced, gas flows smoothly, the problem of uneven pressure caused by gas leakage in a small load condition can be reduced, the stable operation of the engine under various conditions is effectively ensured, and the reliability of the engine is ensured.

[0004] The cylinder cover assembly provided by the utility model, the gas separated by the oil-gas separator enters the cylinder cover inlet passage and the cylinder inlet passage from the small load channel in sequence, the blow-by gas can be introduced into the combustion chamber and burned again, the sealing ability of the connecting place of the cylinder cover inlet passage and the cylinder inlet passage is effectively improved through the sealing cavity, gas leakage is reduced, so that the gas flows smoothly, the problem of uneven pressure caused by gas leakage in a small load condition can be reduced, the stable operation of the engine under various conditions is effectively ensured, and the reliability of the engine is ensured. The cylinder cover inlet passage is built-in, the external pipeline is cancelled, the engine is conveniently arranged, and the development cost is effectively reduced.

[0005] The cylinder cover assembly provided by the utility model, the gas separated by the oil-gas separator enters the cylinder cover inlet passage and the cylinder inlet passage from the small load channel in sequence, the blow-by gas can be introduced into the combustion chamber and burned again, the sealing ability of the connecting place of the cylinder cover inlet passage and the cylinder inlet passage is effectively improved through the sealing cavity, gas leakage is reduced, so that the gas flows smoothly, the problem of uneven pressure caused by gas leakage in a small load condition can be reduced, the stable operation of the engine under various conditions is effectively ensured, and the reliability of the engine is ensured. The cylinder cover inlet passage is built-in, the external pipeline is cancelled, the engine is conveniently arranged, and the development cost is effectively reduced.

[0006] According to the cylinder cover assembly of some embodiments of the present application, the sealing cavities are multiple, and the multiple sealing cavities are distributed in a spaced apart manner along a direction away from the gas outlet.

[0007] According to the cylinder cover assembly of some embodiments of the present application, the sealing cavities are multiple, and the multiple sealing cavities are distributed in a spaced apart manner along a direction away from the gas outlet.

[0008] According to the cylinder cover assembly of some embodiments of the present application, the sealing cavities are multiple, and the multiple sealing cavities are distributed in a spaced apart manner along a direction away from the gas outlet.

[0009] Among them, the cylinder cover mounting surface includes a first plane located on one side of the first sealing cavity away from the second sealing cavity, a second plane located between the first sealing cavity and the second sealing cavity, and a third plane located between the second sealing cavity and the gas outlet.

[0010] According to the cylinder cover assembly of some embodiments of the present application, the cavity height of the first sealing cavity is h1, the cavity height of the second sealing cavity is h2, and h2≥2h1 is satisfied.

[0011] And / or, the cross-sectional area of the first sealing cavity is s1, the cross-sectional area of the second sealing cavity is s2, and s2>1.5s1 is satisfied.

[0012] According to the cylinder cover assembly of some embodiments of the present application, the cylinder cover is coated with sealant between the second plane;

[0013] And / or, the cylinder cover is coated with sealant between the first sealing cavity.

[0014] According to the cylinder cover assembly of some embodiments of the present application, the width of the second plane is d1, and 1mm≤d1≤6mm is satisfied.

[0015] And / or, the width of the first plane is d2, and d2≥1mm is satisfied.

[0016] According to the cylinder cover assembly of some embodiments of the present application, the cylinder cover inlet passage is four and is respectively a cylinder cover first passage, a cylinder cover second passage, a cylinder cover third passage and a cylinder cover fourth passage which are sequentially communicated, the cylinder cover first passage is communicated with the small load passage, and the cylinder cover fourth passage has the gas outlet.

[0017] Among them, the length direction of any two adjacent ones of the cylinder cover first passage, the cylinder cover second passage, the cylinder cover third passage and the cylinder cover fourth passage forms an included angle.

[0018] According to the cylinder cover assembly of some embodiments of the present application, the cylinder cover intake passage comprises a cylinder cover first passage, a cylinder cover second passage and a cylinder cover third passage which are sequentially communicated, the cylinder cover first passage is communicated with the cylinder cover cover intake passage, the cylinder cover further is provided with an engine intake passage for being communicated with the combustion chamber, and the cylinder cover third passage is communicated with the engine intake passage.

[0019] The utility model also proposes an engine.

[0020] According to the engine of the utility model embodiment, comprising the cylinder cover assembly of any one embodiment above.

[0021] The engine and the cylinder cover assembly have the same advantages as the prior art, which will not be repeated here.

[0022] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

[0024] Fig. 1 It is the sectional view of the cylinder cover assembly according to the utility model embodiment;

[0025] Fig. 2 It is the partial enlarged view of the cylinder cover cover fourth passage and the cylinder cover first passage of the cylinder cover assembly according to the utility model embodiment.

[0026] Reference signs:

[0027] Cylinder cover assembly 100,

[0028] Cylinder cover 1, cylinder cover intake passage 11, cylinder cover first passage 111, cylinder cover second passage 112, cylinder cover third passage 113, engine intake passage 12,

[0029] Cylinder cover cover 2, cylinder cover cover intake passage 21, cylinder cover cover first passage 211, cylinder cover cover second passage 212, cylinder cover cover third passage 213, cylinder cover cover fourth passage 214, cylinder cover cover mounting surface 22, gas outlet 221, sealing cavity 222, first sealing cavity 2221, second sealing cavity 2222, first plane 223, second plane 224, third plane 225, plug 23, valve chamber cavity 24,

[0030] Oil-gas separator 3, small load passage 31. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by 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" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Unless otherwise specified, the front-rear direction in the present application is the longitudinal direction of the vehicle, i.e. the X direction; the left-right direction is the lateral direction of the vehicle, i.e. the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e. the Z direction.

[0035] The following description is made with reference to Figs. 1-2The cylinder cover assembly 100 according to the embodiment of the utility model can make the gas separated by the oil-gas separator 3 enter the cylinder cover cover inlet passage 21 and the cylinder cover inlet passage 11 from the small load passage 31 in sequence, can introduce the blow-by gas into the combustion chamber for combustion again, and can effectively improve the sealing capacity of the connection between the cylinder cover cover inlet passage 21 and the cylinder cover inlet passage 11, reduce gas leakage, thereby ensuring smooth gas flow, reducing the problem of uneven pressure caused by gas leakage under small load conditions, effectively ensuring the smooth operation of the engine under various conditions, and ensuring the reliability of the engine. The cylinder cover cover inlet passage 21 is built-in, the external pipeline is cancelled, the engine is conveniently arranged, and the development cost is effectively reduced.

[0036] As shown in Figs. 1-2 The cylinder cover assembly 100 according to one embodiment of the utility model comprises a cylinder cover 1, a cylinder cover cover 2 and an oil-gas separator 3.

[0037] It should be noted that the cylinder cover 1 is part of the structure of the engine cylinder, is used for being connected with the cylinder body, can be connected to the upper side of the cylinder body, can seal the upper side of the cylinder body, and can make the cylinder body communicate with part of the structure of the cylinder cover 1 for the working requirement of the engine.

[0038] The cylinder cover inlet passage 11 is formed in the cylinder cover 1, is used for realizing the flow of gas, and can make the gas flow in the cylinder cover 1 along the cylinder cover inlet passage 11. In the specific design, the cylinder cover inlet passage 11 is located in at least part of the cylinder cover 1, that is, the gas flow can be realized in at least part of the cylinder cover 1, so that the cylinder cover inlet passage 11 can be avoided from interfering with other structures of the cylinder cover 1, the layout is more compact and reasonable, and the cylinder cover inlet passage 11 is formed in the cylinder cover 1 and can be integrally formed with the cylinder cover 1.

[0039] The cylinder cover cover 2 is installed on the cylinder cover 1, can be connected to the upper side of the cylinder cover 1, and in the specific design, the cylinder cover cover 2 can be detachably connected with the cylinder cover 1 through bolts or other connecting members, can seal the upper side of the cylinder cover 1, and can make part of the internal structure of the cylinder cover 1 and the cylinder cover cover 2 communicate, so as to realize the installation of the engine. The oil-gas separator 3 is installed on the cylinder cover cover 2, and in the embodiment, the oil-gas separator 3 can be connected to the upper side of the cylinder cover cover 2, and in the specific design, the cylinder cover cover 2 can be detachably connected with the oil-gas separator 3 through bolts or other connecting members, and part of the internal structure of the cylinder cover cover 2 and the oil-gas separator 3 can be made to communicate.

[0040] The cylinder head cover 2 is provided with a cylinder head cover intake passage 21 for realizing the flow of gas in the cylinder head cover 2.

[0041] The oil-gas separator 3 is provided with a low-load passage 31 for realizing the flow of gas in the oil-gas separator 3, and the cylinder head cover intake passage 21 is communicated with the low-load passage 31, so that the gas in the low-load passage 31 can flow into the cylinder head cover intake passage 21. The oil-gas separator 3 is used for being communicated with the blow-by gas leaked from the crankcase, and the blow-by gas can enter the cylinder head cover intake passage 21 through the oil-gas separator 3. The oil-gas separator 3 is connected to the exhaust side of the cylinder head cover 2, so that more blow-by gas from the crankcase leakage can be absorbed to realize the collection of gas.

[0042] The cylinder head cover 2 is provided with a cylinder head cover mounting surface 22 for being connected with the cylinder head 1, and the cylinder head cover intake passage 21 is provided with a gas outlet 221 arranged on the cylinder head cover mounting surface 22. The gas outlet 221 is communicated with the cylinder head intake passage 11, and the cylinder head cover mounting surface 22 is provided with at least one sealing cavity 222 arranged outside the gas outlet 221.

[0043] Specifically, the cylinder head cover 2 is provided with the cylinder head cover mounting surface 22 on the side close to the cylinder head 1. The cylinder head cover intake passage 21 is the gas outlet end at the cylinder head cover mounting surface 22, and the cylinder head cover mounting surface 22 is provided with the gas outlet 221 for communicating the cylinder head cover intake passage 21 with the cylinder head intake passage 11. The cylinder head cover mounting surface 22 is further provided with the sealing cavities 222, and the sealing cavities 222 are at least one. The at least one sealing cavity 222 is arranged outside the gas outlet 221 to seal the outside of the gas outlet 221 and avoid the leakage of gas at the gas outlet 221.

[0044] In actual design, the sealing cavities 222 can be one, two, three, etc.

[0045] Further, the internal combustion engine working process is generally as follows: after the intake of the mixture, the mixture is compressed, and then the mixture is ignited or compression-ignited, thereby driving the piston to work to generate power. From the compression of the mixture to the combustion, a very high pressure is generated, and the compressed mixture can flow out from the gaps between the piston and the cylinder, the piston ring opening, the gap between the piston ring and the cylinder, and the like into the crankcase, thereby forming crankcase blow-by gas. Since the blow-by gas contains harmful components, the blow-by gas needs to be sucked from the intake system into the combustion chamber, combusted again, and then discharged from the exhaust pipe. Since there is a large amount of high-temperature engine oil and engine oil vapor in the crankcase, the blow-by gas can carry the engine oil vapor to form oil gas when passing through the crankcase, and if the engine oil in the oil gas directly enters the combustion system along with the blow-by gas, the combustion and emission can be deteriorated. Therefore, the engine oil droplets in the oil gas need to be separated.

[0046] Meanwhile, when the engine burns fuel, some by-products including water vapor are generated, and the water vapor can also flow out from the gaps between the piston and the cylinder, the piston ring opening, the gap between the piston ring and the cylinder, and the like into the crankcase; generally, the outlet of the crankcase ventilation system is connected to the intake manifold, so that under different working conditions of the engine, the separated blow-by gas of the oil gas separator 3 can be introduced into the combustion chamber again for combustion by using the vacuum suction force generated by the intake air.

[0047] When the engine is in a small load working condition, the engine speed is low, and the airflow can be weak. The existing small load channel structure of the crankcase ventilation system is unreasonable, which causes uneven distribution of the oil gas mixture between the cylinders, and can cause poor airflow and uneven pressure in some areas, which can cause local high pressure in the blow-by gas channel of the crankcase ventilation system, leakage, and affect the performance of the engine and other mechanical failures.

[0048] According to the cylinder cover assembly 100, the small load channel 31 of the oil gas separator 3 is in communication with the cylinder cover cover intake channel 21 and the cylinder cover intake channel 11, the blow-by gas generated after the engine works can be separated in the oil gas separator 3, the separated gas can enter the cylinder cover cover intake channel 21 and the cylinder cover intake channel 11 in sequence from the small load channel 31, the blow-by gas can be introduced into the combustion chamber for combustion again, at least one sealing cavity 222 is arranged at the connection position of the cylinder cover cover intake channel 21 and the cylinder cover intake channel 11, the sealing ability of the connection position of the cylinder cover cover intake channel 21 and the cylinder cover intake channel 11 can be effectively improved, gas leakage can be reduced, the smooth flow of the gas can be ensured, the problem of uneven pressure caused by gas leakage under the small load working condition can be reduced, the stable operation of the engine under various working conditions can be effectively ensured, and the reliability of the engine is ensured. The cylinder cover cover intake channel 21 is built-in, the external pipeline is cancelled, the engine can be conveniently arranged, and the development cost is effectively reduced.

[0049] In some embodiments, the sealing cavities 222 are arranged in multiple numbers, and the multiple sealing cavities 222 are arranged in a spaced manner along a direction away from the gas outlet 221.

[0050] In this way, by arranging multiple sealing cavities 222, sealing can be performed at multiple positions in the direction away from the gas outlet 221, and the sealing effect outside the gas outlet 221 can be enhanced by the multiple sealing cavities 222, so that gas leakage at the gas outlet 221 can be well avoided.

[0051] Specifically, the gas outlet 221 is located at the connection between the cylinder head cover 2 and the cylinder head 1, and the multiple sealing cavities 222 are arranged outside the gas outlet 221 and arranged in a spaced manner along a direction away from the gas outlet 221. In this way, the multiple sealing cavities 222 can be used to seal the outside of the gas outlet 221, and compared with one sealing cavity 222, the multiple sealing cavities 222 can reduce the size of a single sealing cavity 222, and the processing difficulty can be reduced. Moreover, the gas outlet 221 is located at the connection between the cylinder head cover 2 and the cylinder head 1, and the sealing cavities 222 can enhance the sealing performance at the connection, without reducing the structural strength of the cylinder head cover 2, so that the structural arrangement of the cylinder head cover 2 is reasonable and reliable.

[0052] In some embodiments, the sealing cavities 222 are arranged in two, three, four, or the like, and the number of the sealing cavities 222 is related to the size of the space outside the gas outlet 221, and can be flexibly selected according to actual conditions.

[0053] In some embodiments, the sealing cavities 222 are annular cavities, and the multiple annular cavities are arranged in a spaced manner along a radial direction from inside to outside around the gas outlet 221.

[0054] In this way, by arranging multiple annular cavities around the gas outlet 221, the multiple annular cavities can be used to seal in the circumferential direction of the gas outlet 221, and the sealing effect of one circle of the gas outlet 221 can be improved, so that the gas leakage at the connection between the cylinder head cover intake passage 21 and the cylinder head intake passage 11 can be effectively reduced, and the flow smoothness of the gas in the two different passages can be improved.

[0055] Specifically, the cylinder head cover intake passage 21 and the cylinder head intake passage 11 can be circular passages, the gas outlet 221 can be a circular hole or an elliptical hole, and the multiple annular cavities are arranged in the circumferential direction around the gas outlet 221, so that multiple annular cavities extending in the circumferential direction can be formed outside the gas outlet 221. In this way, the annular cavities can extend in an elliptical shape along the gas outlet 221, or the annular cavities can extend in a circular shape along the gas outlet 221, and the annular cavities are simple and convenient to process, and the processing cost is reduced.

[0056] The sealing cavity 222 is arranged on the cylinder cover cap mounting surface 22, that is, the sealing cavity 222 is close to the cylinder cover 1, and the sealing cavity 222 is recessed on the cylinder cover cap mounting surface 22 away from the cylinder cover 1. The sealing cavity 222 can also be arranged on the side of the cylinder cover 1 close to the cylinder cover cap mounting surface 22, and the arrangement mode is not limited and can be flexibly arranged according to actual space requirements.

[0057] In some embodiments, the sealing cavity 222 is two, that is, a first sealing cavity 2221 and a second sealing cavity 2222. The first sealing cavity 2221 is located on the side of the second sealing cavity 2222 away from the gas outlet 221, that is, the first sealing cavity 2221 is away from the gas outlet 221, and the second sealing cavity 2222 is close to the gas outlet 221. The first sealing cavity 2221 and the second sealing cavity 2222 are spaced apart and distributed along the radial direction of the gas outlet 221. The second sealing cavity 2222 can seal the gas outlet 221 at a position close to the gas outlet 221, and the first sealing cavity 2221 can seal the gas outlet 221 at a position away from the gas outlet 221. The first sealing cavity 2221 and the second sealing cavity 2222 can seal multiple positions of the connection position of the cylinder cover cap 2 and the cylinder cover 1, thereby improving the sealing effect.

[0058] The cylinder cover cap mounting surface 22 includes a first plane 223 located on the side of the first sealing cavity 2221 away from the second sealing cavity 2222, a second plane 224 located between the first sealing cavity 2221 and the second sealing cavity 2222, and a third plane 225 located between the second sealing cavity 2222 and the gas outlet 221.

[0059] Specifically, the cylinder cover cap mounting surface 22 is provided with the first sealing cavity 2221 and the second sealing cavity 2222. The first sealing cavity 2221 and the second sealing cavity 2222 are spaced apart and distributed in a direction gradually close to the gas outlet 221. The first sealing cavity 2221 and the second sealing cavity 2222 divide the cylinder cover cap mounting surface 22 into the first plane 223, the second plane 224, and the third plane 225. The first plane 223, the first sealing cavity 2221, the second plane 224, the second sealing cavity 2222, and the third plane 225 are sequentially distributed in a direction gradually close to the gas outlet 221.

[0060] Therefore, by arranging the first plane 223, the second plane 224, and the third plane 225, three plane structures can be formed on the outer side of the gas outlet 221 of the cylinder cover cap mounting surface 22. The cylinder cover cap mounting surface 22 and the cylinder cover 1 can be connected in close contact, thereby improving the tightness of the connection between the two. The third plane 225 is arranged on the outer side of the gas outlet 221 of the cylinder cover cap mounting surface 22, which can ensure the integrity of the gas outlet 221 and the structural strength at the gas outlet 221, thereby effectively preventing gas leakage at the gas outlet 221.

[0061] In some embodiments, the cavity height of the first sealing cavity 2221 is h1, the cavity height of the second sealing cavity 2222 is h2, and h2≥2h1 is satisfied.

[0062] Specifically, as shown in Fig. 2 the first sealing cavity 2221 and the second sealing cavity 2222 are both arranged on the cylinder head cover mounting surface 22, and the first sealing cavity 2221 and the second sealing cavity 2222 are recessed on the cylinder head cover mounting surface 22 in a direction away from the cylinder head 1 to form a sink structure. The cavity height of the first sealing cavity 2221 and the cavity height of the second sealing cavity 2222 can be different. The cavity height of the second sealing cavity 2222 can be greater than the cavity height of the first sealing cavity 2221. The cavity height of the first sealing cavity 2221 is h1, the cavity height of the second sealing cavity 2222 is h2, and h2 can be 2h1, 2.5h1, 3h1, etc. The cavity of the second sealing cavity 2222 can be greater than the cavity of the first sealing cavity 2221. The excess sealant can enter the second sealing cavity 2222 during sealing to accommodate excess sealant, effectively prevent the sealant from entering the cylinder head intake passage 11 from the air outlet 221, improve the sealing performance of the air outlet 221, prevent gas leakage at the air outlet 221, and prevent external blow-by gas from entering the air outlet 221.

[0063] The cavity height of the first sealing cavity 2221 and the cavity height of the second sealing cavity 2222 are related to the cavity width of the first sealing cavity 2221 and the cavity width of the second sealing cavity 2222. Generally, h2 is greater than h1, and when h2≥2h1 is satisfied, the cavity width of the first sealing cavity 2221 and the cavity width of the second sealing cavity 2222 can be the same, and as shown in Fig. 2 the cavity width of the first sealing cavity 2221 and the cavity width of the second sealing cavity 2222 are h3, and the cavity height of the second sealing cavity 2222 is twice the cavity height of the first sealing cavity 2221. In this way, the sealing performance of the air outlet 221 can be satisfied, and the processing of the first sealing cavity 2221 and the second sealing cavity 2222 can be more convenient and efficient, thereby reducing the processing cost.

[0064] The cavity height of the second sealing cavity 2222 cannot be less than the cavity height of the first sealing cavity 2221, so that excess sealant during sealing can be prevented from entering the air outlet 221 and causing poor sealing effect. The cavity height of the second sealing cavity 2222 and the cavity height of the first sealing cavity 2221 are not limited to the above, and can be selectively set according to actual needs.

[0065] In other embodiments, the cross-sectional area of the first sealing cavity 2221 is s1, the cross-sectional area of the second sealing cavity 2222 is s2, and s2>1.5s1 is satisfied.

[0066] Specifically, when the cross-sectional area of the first sealing cavity 2221 and the cross-sectional area of the second sealing cavity 2222 are different, the cross-sectional area of the second sealing cavity 2222 needs to be greater than the cross-sectional area of the first sealing cavity 2221, and the cross-sectional area of the first sealing cavity 2221 is s1, the cross-sectional area of the second sealing cavity 2222 is s2, and s2 can be 1.5s1, 1.8s1, 2.0s1, etc. The cavity area of the second sealing cavity 2222 can be greater than the cavity area of the first sealing cavity 2221, so that the excess sealant can enter the second sealing cavity 2222 during sealing, realizing the accommodation of excess sealant, effectively preventing the sealant from entering the cylinder head intake passage 11 from the gas outlet 221, improving the sealing performance of the gas outlet 221, preventing gas leakage at the gas outlet 221, and also preventing external blow-by gas from entering the gas outlet 221.

[0067] Wherein, the cross-sectional area of the second sealing cavity 2222 cannot be less than the cross-sectional area of the first sealing cavity 2221, so that the excess sealant during sealing can have a containing space without entering the gas outlet 221, thereby improving the sealing effect. The cross-sectional area of the second sealing cavity 2222 and the cross-sectional area of the first sealing cavity 2221 are not limited to the above, and can be selectively set according to actual needs.

[0068] Therefore, through the above setting mode, the first sealing cavity 2221 and the second sealing cavity 2222 can reliably seal the outside of the gas outlet 221. In addition, the setting mode of the first sealing cavity 2221 and the second sealing cavity 2222 is not limited to the above, and can be set according to actual space requirements.

[0069] In some embodiments, the cylinder head 1 is coated with sealant between the second plane 224, and the sealant is a material with bonding and sealing properties. During installation, the sealant is coated between the cylinder head 1 and the second plane 224, so that the sealant can seal the second plane 224 and the cylinder head 1 respectively, and can seal the gap between the second plane 224 and the cylinder head 1, thereby improving the tightness of the connection between the cylinder head 1 and the second plane 224. Coating sealant between the cylinder head 1 and the second plane 224 can keep the sealant away from the gas outlet 221, so as to avoid the sealant entering the gas outlet 221, causing the diameter of the gas outlet 221 to become smaller, and affecting the smoothness of the gas flowing from the cylinder head cover intake passage 21 to the cylinder head intake passage 11. Through the sealant, the reliability of the connection between the cylinder head 1 and the cylinder head cover 2 can be improved, and the integrity of the cylinder head assembly 100 can be improved.

[0070] In some embodiments, the sealing glue is coated between the cylinder cover 1 and the first sealing cavity 2221, and the sealing glue can seal the first sealing cavity 2221 and the cylinder cover 1 respectively, and seal the gap between the first sealing cavity 2221 and the cylinder cover 1, thereby improving the tightness of the connection between the cylinder cover 1 and the first sealing cavity 2221. In addition, the sealing glue is coated between the cylinder cover 1 and the first sealing cavity 2221, so that the sealing glue is far away from the gas outlet 221, and the sealing glue can be prevented from entering the gas outlet 221, thereby avoiding the reduction of the caliber of the gas outlet 221 and affecting the smoothness of the gas flowing from the cylinder cover cover inlet passage 21 to the cylinder cover inlet passage 11. In addition, the sealing glue can improve the reliability of the connection between the cylinder cover 1 and the cylinder cover 2, and improve the integrity of the cylinder cover assembly 100.

[0071] In actual installation, the sealing glue is coated between the cylinder cover 1 and the first sealing cavity 2221, and the sealing glue is coated between the cylinder cover 1 and the second plane 224, so that three glue coating modes can be realized, and the cylinder cover 1 can be sealed with the second plane 224 and / or the first sealing cavity 2221 which is far away from the gas outlet 221, thereby realizing the sealing of the outside of the gas outlet 221, and preventing the sealing glue from entering the gas outlet 221, and improving the sealing effect.

[0072] In some embodiments, the width of the second plane 224 is d1, and satisfies: 1mm≤d1≤6mm, that is, the width d1 of the second plane 224 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc. By setting these values, the second plane 224 has a certain width, so that the sealing glue can be coated between the second plane 224 and the cylinder cover 1. After the cylinder cover 1 is pressed against the second plane 224, the sealing glue can reliably connect the second plane 224 and the cylinder cover 1, thereby improving the sealing effect of the outside of the gas outlet 221.

[0073] In some embodiments, the width of the second plane 224 cannot be too small, otherwise the sealing glue cannot be supported, and after the second plane 224 is pressed against the cylinder cover 1, a sealing glue film cannot be formed between the second plane 224 and the cylinder cover 1, thereby reducing the sealing effect of the outside of the gas outlet 221 and causing oil leakage. In addition, the width of the second plane 224 cannot be too large, otherwise the sealing width between the second plane 224 and the cylinder cover 1 can be satisfied, but the overall arrangement of the machine can be affected.

[0074] In some embodiments, the width of the first plane 223 is d2, and d2≥1mm, i.e., the width d2 of the first plane 223 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc. By setting these values, the first plane 223 has a certain width, so that the sealant can be coated between the first plane 223 and the cylinder head 1. After the cylinder head 1 is pressed against the first plane 223, the sealant can reliably connect the first plane 223 and the cylinder head 1, improve the sealing effect outside the gas outlet 221, and effectively prevent foreign matter outside the engine from entering the first sealing cavity 2221.

[0075] The width of the first plane 223 cannot be too small, otherwise foreign matter outside the engine will enter the first sealing cavity 2221, affecting the sealing effect of the first sealing cavity 2221, and further affecting the sealing effect of the gas outlet 221. The width of the first plane 223 cannot be too large, otherwise it can meet the sealing width between the first plane 223 and the cylinder head 1, prevent foreign matter outside the engine from entering the first sealing cavity 2221, but affect the overall arrangement.

[0076] In addition, when the sealant is sufficient, the excess sealant can be used to seal and connect the third plane 225 and the cylinder head 1, forming a sealing ring near the gas outlet 221 to enhance the sealing of the outside of the gas outlet 221. The width of the third plane 225 is d3, which cannot be too small, otherwise it cannot bear the sealant, and after the second plane 224 is pressed against the cylinder head 1, it cannot form a sealant film with the cylinder head 1, reducing the sealing effect outside the gas outlet 221. The width of the third plane 225 cannot be too large, otherwise it can meet the sealing width between the third plane 225 and the cylinder head 1, but will affect the overall arrangement.

[0077] In some embodiments, the cylinder head cover intake passage 21 is four, which are sequentially connected cylinder head cover first passage 211, cylinder head cover second passage 212, cylinder head cover third passage 213 and cylinder head cover fourth passage 214. The cylinder head cover first passage 211 is connected with the small load passage 31, and the cylinder head cover fourth passage 214 has a gas outlet 221.

[0078] Specifically, the oil-gas separator 3 is connected to an upper position of the cylinder head cover 2 and located at an exhaust side of the cylinder head cover 2, and can be arranged parallel to the cylinder head cover mounting surface 22 or at an angle with the cylinder head cover mounting surface 22, and a small load channel 31 is formed in the oil-gas separator 3, wherein the cylinder head cover intake channel 21 comprises a cylinder head cover first channel 211, a cylinder head cover second channel 212, a cylinder head cover third channel 213 and a cylinder head cover fourth channel 214 connected in sequence, and the outlet end of the small load channel 31 is connected with the cylinder head cover first channel 211, and the cylinder head cover fourth channel 214 has a gas outlet 221 which can be connected with the cylinder head intake channel 11 to form a complete gas flow channel from the oil-gas separator 3, the cylinder head cover 2 and the cylinder head 1.

[0079] Further, when the engine is in a small load condition, the blow-by gas in the crankcase enters the oil-gas separator 3, and the gas separated by the oil-gas separator 3 flows into the small load channel 31, and then flows into the cylinder head cover first channel 211, the cylinder head cover second channel 212, the cylinder head cover third channel 213 and the cylinder head cover fourth channel 214 in sequence, and then enters the cylinder head intake channel 11 from the gas outlet 221, and finally enters the combustion chamber for combustion.

[0080] Among them, any two adjacent ones of the cylinder head cover first channel 211, the cylinder head cover second channel 212, the cylinder head cover third channel 213 and the cylinder head cover fourth channel 214 form an included angle in the length direction, that is, the cylinder head first channel 111 can be distributed at an intersection with the cylinder head second channel 112, or the cylinder head cover second channel 212 can be distributed at an intersection with the cylinder head cover third channel 213, or the cylinder head cover third channel 213 can be distributed at an intersection with the cylinder head cover fourth channel 214, and the setting mode is various and can be flexibly selected.

[0081] Specifically, as shown in Fig. 1 the extension directions of the cylinder head cover first channel 211, the cylinder head cover second channel 212, the cylinder head cover third channel 213 and the cylinder head cover fourth channel 214 are different and intersect with each other, and the cylinder head cover first channel 211, the cylinder head cover second channel 212, the cylinder head cover third channel 213 and the cylinder head cover fourth channel 214 are all located outside the valve cavity of the cylinder head cover 2, and the space outside the valve cavity can be used to arrange the four cylinder head intake channels 11, so that the overall structure arrangement is more compact, and the cylinder head cover first channel 211, the cylinder head cover second channel 212, the cylinder head cover third channel 213 and the cylinder head cover fourth channel 214 are all arranged in the cylinder head cover 2, and the external pipeline is cancelled, which is convenient for the mounting arrangement of the engine and effectively reduces the development cost.

[0082] Therefore, through the above-mentioned arrangement, the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover can each form a certain tilt angle, so that blow-by gas can flow in the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover by gravity, thereby increasing the gas flow rate. This allows the airflow to flow stably to the cylinder head intake passage 11, reducing local high pressure caused by uneven pressure, avoiding leakage, and ensuring the reliability of the engine.

[0083] Among them, such as Fig. 1 As shown, the cylinder head cover second channel 212 and cylinder head cover third channel 213 are provided with plugs 23 at the ends away from each other, which can seal the ends away from each other to prevent gas leakage. The cylinder head cover 2 is provided with two valve chambers 24 on the side near the cylinder head 1, and the two valve chambers 24 are respectively distributed with the intake valve and the exhaust valve.

[0084] In some embodiments, the cylinder head intake passage 11 includes a cylinder head first passage 111, a cylinder head second passage 112 and a cylinder head third passage 113 connected in sequence. The cylinder head first passage 111 is connected to the cylinder head cover intake passage 21. The cylinder head 1 is also provided with an engine intake passage 12 for communicating with the combustion chamber. The cylinder head third passage 113 is connected to the engine intake passage 12.

[0085] Specifically, the cylinder head intake channel 11 can be provided in multiple ways. In this embodiment, there are three cylinder head intake channels 11, namely the first cylinder head channel 111, the second cylinder head channel 112, and the third cylinder head channel 113. The first cylinder head channel 111, the second cylinder head channel 112, and the third cylinder head channel 113 are connected in sequence. The inlet end of the first cylinder head channel 111 is connected to the fourth cylinder head channel 214 of the cylinder head cover intake channel 21, so that the gas in the fourth cylinder head channel 214 can flow into the first cylinder head channel 111.

[0086] Furthermore, the cylinder head 1 is provided with an engine intake passage 12, which is used to accommodate fresh gas from the outside. The engine intake passage 12 is connected to the combustion chamber, allowing fresh gas from the outside to enter the combustion chamber and achieve combustion in the engine. The outlet end of the cylinder head third passage 113 is connected to the engine intake passage 12, allowing gas in the cylinder head third passage 113 to flow into the engine intake passage 12. In this way, blow-by gas can enter the engine intake passage 12, and the blow-by gas enters the combustion chamber together with the fresh gas, achieving re-combustion of the blow-by gas.

[0087] This utility model also proposes an engine.

[0088] The engine according to the embodiment of the utility model, including the cylinder cover subassembly 100 of any one embodiment above, the cylinder cover subassembly 100 is a part structure of engine, the cylinder cover subassembly 100 includes oil gas separator 3, cylinder cover cover 2 and cylinder cover 1, and set up oil gas separator 3 Small load channel 31 with cylinder cover cover inlet channel 21 and cylinder cover inlet channel 11 intercommunication, can make the blow-by gas from the engine work after entering oil gas separator 3 in oil gas separator 3 carries out oil gas separation, the gas after separation from small load channel 31 enters cylinder cover cover inlet channel 21 and cylinder cover inlet channel 11 in proper order, can introduce blow-by gas into combustion chamber and burn again, and by setting at least one sealing cavity 222 in the connecting place of cylinder cover cover inlet channel 21 and cylinder cover inlet channel 11, can effectively improve the sealing capacity of the connecting place of cylinder cover cover inlet channel 21 and cylinder cover inlet channel 11, reduce gas leakage, to guarantee that gas flows smoothly, can reduce the problem of uneven pressure caused by gas leakage when small load condition, effectively guarantee the smooth operation of engine under various conditions.

[0089] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A cylinder head assembly characterized by, include: Cylinder head, wherein a cylinder head intake passage is formed within the cylinder head; The cylinder head cover and the oil-gas separator are provided. The cylinder head cover is installed on the cylinder head, and the oil-gas separator is installed on the cylinder head cover. An intake passage is formed inside the cylinder head cover, and a low-load passage is formed inside the oil-gas separator. The intake passage of the cylinder head cover is connected to the low-load passage. The cylinder head cover has a cylinder head cover mounting surface for connecting with the cylinder head, the cylinder head cover air intake channel has an air outlet located on the cylinder head cover mounting surface, the air outlet is connected to the cylinder head air intake channel, and the cylinder head cover mounting surface has at least one sealing cavity located outside the air outlet.

2. The cylinder head assembly of claim 1, wherein The sealing cavity is configured as a plurality of such cavities, and the plurality of such cavities are spaced apart along a direction away from the air outlet.

3. The cylinder head assembly of claim 2, wherein, The sealing cavity is constructed as an annular cavity, and multiple annular cavities are arranged radially from the inside to the outside, spaced apart and surrounding the air outlet.

4. The cylinder head assembly of claim 2 or 3, wherein, The sealing cavity is two, namely a first sealing cavity and a second sealing cavity, and the first sealing cavity is located on the side of the second sealing cavity away from the air outlet; The cylinder head cover mounting surface includes a first plane located on the side of the first sealing cavity away from the second sealing cavity, a second plane located between the first sealing cavity and the second sealing cavity, and a third plane located between the second sealing cavity and the air outlet.

5. The cylinder head assembly of claim 4, wherein, The height inside the first sealing cavity is h1, and the height inside the second sealing cavity is h2, and the following condition is met: h2≥2h1; And / or, the cross-sectional area of ​​the first sealing cavity is s1, the cross-sectional area of ​​the second sealing cavity is s2, and satisfies: s2 > 1.5s1.

6. The cylinder head assembly of claim 4, wherein, The cylinder head is coated with sealant between itself and the second plane; And / or, the cylinder head is coated with sealant between itself and the first sealing cavity.

7. The cylinder head assembly of claim 4, wherein The width of the second plane is d1, and satisfies: 1mm≤d1≤6mm; And / or, the width of the first plane is d2, and satisfies: d2≥1mm.

8. The cylinder head assembly of claim 1, wherein, The cylinder head cover has four intake channels, which are connected in sequence: cylinder head cover first channel, cylinder head cover second channel, cylinder head cover third channel and cylinder head cover fourth channel. The cylinder head cover first channel is connected to the low load channel, and the cylinder head cover fourth channel has the air outlet. Wherein, the length directions of any two adjacent channels of the cylinder head cover first channel, the cylinder head cover second channel, the cylinder head cover third channel and the cylinder head cover fourth channel form an included angle.

9. The cylinder head assembly of claim 1, wherein, The cylinder head intake passage includes a first cylinder head passage, a second cylinder head passage, and a third cylinder head passage connected in sequence. The first cylinder head passage is connected to the cylinder head cover intake passage. The cylinder head is also provided with an engine intake passage for communicating with the combustion chamber. The third cylinder head passage is connected to the engine intake passage.

10. An engine characterized by, Includes the cylinder head assembly according to any one of claims 1-9.

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