Cylinder head assembly and engine

Abstract

The application discloses a cylinder head assembly and an engine, and the cylinder head assembly comprises a cylinder head, an air inlet channel of the cylinder head is formed in the cylinder head; a cylinder head cover and an oil-gas separator, the cylinder head cover is connected to the upper portion of the cylinder head, the oil-gas separator is connected to the upper portion of the cylinder head cover, an air inlet channel of the cylinder head cover is formed in the cylinder head cover, a small load channel is formed in the oil-gas separator, and the air inlet channel of the cylinder head cover is communicated between the small load channel and the air inlet channel of the cylinder head; wherein the cylinder head has a cylinder head top surface for being connected with the cylinder head cover, the included angle between the cylinder head top surface and the longitudinal center surface of the engine is a1, the included angle between the length direction of the small load channel and the cylinder head top surface is a2, and the following conditions are met: 0° < a1 < 90°, and 30° ≤ a2 ≤ 90°. The cylinder head assembly of the application has a high outflow rate of blow-by gas in the small load channel, can effectively reduce the risk that the gas in the small load channel is easily frozen and blocked in the gas channel to cause the excessive high pressure of the crankcase, and improves the reliability of the engine operation.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more particularly to a cylinder head assembly and an engine having the cylinder head assembly. Background Technology

[0002] In cold winter regions, especially in extremely cold environments where the outside temperature is low enough, condensation in the crankcase passages can freeze, forming ice and clogging the crankcase ventilation pipes. If the crankcase passages are blocked, fuel vapors cannot escape from the crankcase in a timely manner, affecting normal ventilation and fuel vapor recovery. Over time, this can lead to excessive pressure inside the crankcase, causing oil leaks from the front and rear oil seals. In severe cases, it can result in decreased engine performance or other mechanical failures, indicating room for improvement. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cylinder head assembly with a high outflow rate of blow-by gas in the low-load passage, which can effectively reduce the risk of gas in the low-load passage freezing and clogging the gas passage, leading to excessive crankcase pressure, reducing the risk of engine oil leakage, engine performance degradation, mechanical failure, and improving engine operation reliability.

[0004] A cylinder head assembly according to an embodiment of the present invention includes: a cylinder head, wherein a cylinder head intake passage is formed within the cylinder head; a cylinder head cover and an oil-gas separator, wherein the cylinder head cover is connected to the upper part of the cylinder head, the oil-gas separator is connected to the upper part of the cylinder head cover, a cylinder head cover intake passage is formed within the cylinder head cover, a low-load passage is formed within the oil-gas separator, and the cylinder head cover intake passage communicates between the low-load passage and the cylinder head intake passage; wherein the cylinder head has a top surface for connecting to the cylinder head cover, the angle between the top surface of the cylinder head and the longitudinal center plane of the engine is a1, the angle between the length direction of the low-load passage and the top surface of the cylinder head is a2, and satisfies: 0°<a1<90°, 30°≤a2≤90°.

[0005] According to the cylinder head assembly of the present invention, the gas separated by the oil-gas separator sequentially enters the cylinder head cover intake passage and the cylinder head intake passage through the small load passage. This allows the blow-by gas to be introduced into the combustion chamber for re-combustion. Furthermore, the angle α2 between the small load passage and the top surface of the cylinder head is set within the range of 30° to 90°, allowing the blow-by gas in the small load passage to flow rapidly to the cylinder head cover intake passage by gravity. This increases the outflow rate of the blow-by gas in the small load passage, effectively reducing the risk of gas freezing and clogging the gas passage in the small load passage, which could lead to excessive crankcase pressure. This also reduces the risk of engine oil leakage, engine performance degradation, or mechanical failure, thus improving the reliability of engine operation. At the same time, the small load passage, cylinder head cover intake passage, and cylinder head intake passage are built-in, eliminating the need for external piping, which facilitates engine mounting and layout, and effectively reduces development costs.

[0006] According to some embodiments of the present invention, the cylinder head assembly includes a cylinder head cover intake passage, the cylinder head cover first passage being connected to the outlet end of the low load passage, and the angle between the length direction of the cylinder head cover first passage and the top surface of the cylinder head is a3, satisfying: 30°≤a3≤90°.

[0007] According to some embodiments of the present invention, the cylinder head assembly satisfies: a2 = a3.

[0008] According to some embodiments of the cylinder head assembly of the present invention, the cylinder head cover intake passage further includes a cylinder head cover second passage, a cylinder head cover third passage, and a cylinder head cover fourth passage that are sequentially connected to the cylinder head cover first passage. The length directions of any two adjacent cylinder head cover first passage, cylinder head cover second passage, cylinder head cover third passage, and cylinder head cover fourth passage form an included angle, and the cylinder head cover fourth passage is connected to the cylinder head intake passage.

[0009] According to some embodiments of the cylinder head assembly of the present invention, the angle between the length direction of the second channel of the cylinder head cover and the top surface of the cylinder head is a4, the angle between the length direction of the third channel of the cylinder head cover and the top surface of the cylinder head is a5, and satisfies: a5≤a4≤a3.

[0010] According to some embodiments of the present invention, the cylinder head assembly satisfies: a4≤a1≤a3.

[0011] According to some embodiments of the cylinder head assembly of the present invention, the distance between the inlet end of the first channel of the cylinder head cover and the top surface of the cylinder head is h1, and the distance between the inlet end of the fourth channel of the cylinder head cover and the top surface of the cylinder head is h2, and satisfies: h1 > h2.

[0012] According to some embodiments of the cylinder head assembly of the present invention, the inner diameters of the first channel, the second channel, the third channel, and the fourth channel of the cylinder head cover are all configured to be greater than or equal to the inner diameter of the low-load channel.

[0013] According to some embodiments of the present invention, the cylinder head assembly includes a cylinder head first channel, a cylinder head second channel, and a cylinder head third channel connected in sequence. The cylinder head first channel is connected to the cylinder head cover intake channel. The cylinder head is also provided with an engine intake passage for communicating with the combustion chamber. The cylinder head third channel is connected to the engine intake passage.

[0014] And / or, the upper end of the first cylinder head channel is connected to the lower end of the cylinder head cover intake channel, the lower end of the first cylinder head channel is bent and connected to one end of the second cylinder head channel, the other end of the second cylinder head channel is connected to the upper end of the third cylinder head channel, and the lower end of the third cylinder head channel is connected to the engine intake manifold.

[0015] The present invention also proposes an engine.

[0016] An engine according to an embodiment of the present invention includes a cylinder head assembly according to any of the above embodiments.

[0017] The engine and the cylinder head assembly described above have the same advantages over the prior art, which will not be repeated here.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the cylinder head assembly according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Cross-sectional view at point AA;

[0022] Figure 3 yes Figure 1 Cross-sectional view at point BB.

[0023] Figure label:

[0024] Cylinder head assembly 100,

[0025] Cylinder head 1, cylinder head intake passage 11, cylinder head first passage 111, cylinder head second passage 112, cylinder head third passage 113, engine intake manifold 12, cylinder head top surface 13, cylinder head bottom surface 14.

[0026] Cylinder head cover 2, cylinder head cover intake passage 21, cylinder head cover first passage 211, cylinder head cover second passage 212, cylinder head cover third passage 213, cylinder head cover fourth passage 214, plug 23, valve chamber 24, intake camshaft bore 25, exhaust camshaft bore 26.

[0027] Oil-gas separator 3, low-load channel 31,

[0028] The longitudinal center plane of the engine is 200°. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Unless otherwise specified, the front-back direction in this application refers to the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction refers to the lateral direction of the vehicle, i.e., the Y direction; and the up-down direction refers to the vertical direction of the vehicle, i.e., the Z direction.

[0033] The following is for reference. Figures 1-3 The cylinder head assembly 100 according to an embodiment of the present invention has a high outflow rate of blow-by gas in the low-load passage 31, which can effectively reduce the risk of gas in the low-load passage 31 freezing and blocking the gas passage, resulting in excessive crankcase pressure, reduce the risk of engine oil leakage, engine performance degradation, mechanical failure, and improve the reliability of engine operation.

[0034] like Figures 1-3 As shown, a cylinder head assembly 100 according to an embodiment of the present invention includes: a cylinder head 1, a cylinder head cover 2, and an oil-gas separator 3.

[0035] It should be noted that the cylinder head 1 is a part of the engine cylinder structure, used to connect with the cylinder block. The cylinder head 1 can be connected to the upper side of the cylinder block, which can seal the upper side of the cylinder block and allow the cylinder block and part of the cylinder head 1 to communicate for the engine's working requirements.

[0036] A cylinder head intake passage 11 is formed inside the cylinder head 1. The cylinder head intake passage 11 is used to facilitate the flow of gas, allowing gas to flow within the cylinder head 1 along the cylinder head intake passage 11. In a specific design, the cylinder head intake passage 11 is located within at least a portion of the cylinder head 1, allowing gas flow within at least a portion of the cylinder head 1. This avoids interference between the cylinder head intake passage 11 and other structures of the cylinder head 1, resulting in a more compact and rational layout. Furthermore, since the cylinder head intake passage 11 is formed within the cylinder head 1, it can be integrally molded with the cylinder head 1.

[0037] The cylinder head cover 2 is connected to the upper part of the cylinder head 1. In the specific design, the cylinder head cover 2 can be detachably connected to the cylinder head 1 via bolts or other connecting parts. It can seal the upper side of the cylinder head 1 and allow some internal structures of the cylinder head 1 and cylinder head cover 2 to communicate, thereby enabling engine installation. The oil-gas separator 3 is also connected to the upper part of the cylinder head cover 2. In the specific design, the cylinder head cover 2 can be detachably connected to the oil-gas separator 3 via bolts or other connecting parts, allowing some internal structures of the cylinder head cover 2 and oil-gas separator 3 to communicate.

[0038] Furthermore, a cylinder head cover intake passage 21 is formed within the cylinder head cover 2. The cylinder head cover intake passage 21 is used to facilitate gas flow, allowing gas to flow within the cylinder head cover 2 along the cylinder head cover intake passage 21. In the specific design, the cylinder head cover intake passage 21 is located within at least a portion of the cylinder head 1, allowing gas flow within at least a portion of the cylinder head cover 2. This avoids interference between the cylinder head cover intake passage 21 and other structures of the cylinder head cover 2, resulting in a more compact and rational layout. Moreover, since the cylinder head cover intake passage 21 is formed within the cylinder head cover 2, it can be integrally molded with the cylinder head cover 2.

[0039] The oil-gas separator 3 has a small load channel 31, which is used to realize the gas flow in the oil-gas separator 3. The cylinder head cover intake channel 21 is connected between the small load channel 31 and the cylinder head intake channel 11. The oil-gas separator 3 is used to communicate with the blow-by gas leaking from the crankcase. Through the oil-gas separator 3, the blow-by gas can enter the cylinder head cover intake channel 21 and then flow into the cylinder head intake channel 11. The oil-gas separator 3 is connected to the exhaust side of the cylinder head cover 2, which can absorb more blow-by gas leaking from the crankcase and realize gas collection.

[0040] The cylinder head 1 has a cylinder head top surface 13 for connecting with the cylinder head cover 2. The angle between the cylinder head top surface 13 and the longitudinal center plane 200 of the engine is a1, and the angle between the length direction of the small load passage 31 and the cylinder head top surface 13 is a2, and the following conditions are met: 0°<a1<90°, 30°≤a2≤90°.

[0041] Specifically, the cylinder head 1 has a top surface 13 on the side near the cylinder head cover 2 for connection to the cylinder head cover 2. Generally, for a V-type engine, there is a longitudinal center plane 200 of the engine. The extending direction of the top surface 13 of the cylinder head intersects with the longitudinal center plane 200 of the engine, resulting in an angle between them, and the angle is α1. The cylinder head 1 has a bottom surface 14 on the side away from the cylinder head cover 2 for connection to the cylinder block. Generally, the top surface 13 of the cylinder head is parallel to the bottom surface 14 of the cylinder head, and the bottom surface of the cylinder head... The extension direction of cylinder head 14 intersects with the longitudinal center plane 200 of the engine. The angle between the bottom surface of cylinder head 14 and the longitudinal center plane 200 of the engine is also a1, and a1 is half of the V-angle of the V-type engine. The value of a1 can be: 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc. By setting the above multiple values, more types of engines can be made.

[0042] Furthermore, the length direction of the low-load channel 31 intersects with the top surface 13 of the cylinder head, creating an angle of a2 between them. a2 can take values ​​such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, and 90°. By setting these multiple values, more configuration options for the low-load channel 31 can be achieved. A larger a2 value allows the gas (blow-by gas) separated by the oil-gas separator 3 to be discharged more effectively through the low-load channel 31 of the oil-gas separator 3, taking advantage of gravity. However, the angle between the length direction of the low-load channel 31 and the top surface 13 of the cylinder head should not be too small, as this would reduce the gas flow rate within the low-load channel 31.

[0043] The angle between the length direction of the low-load passage 31 and the top surface of the cylinder head 13 is related to the angle between the top surface of the cylinder head 13 and the longitudinal center plane 200 of the engine. Generally, the more vertical the length direction of the low-load passage 31 is, the better, as it facilitates the flow of blow-by gas out of the oil-gas separator 3 by gravity. Furthermore, the shorter the length of the vertically arranged low-load passage 31, the higher the flow velocity of the blow-by gas.

[0044] Therefore, for an inline engine, a value of 90° is optimal for a2.

[0045] Furthermore, the working process of an internal combustion engine is generally as follows: after the air-fuel mixture is drawn in, it is compressed, and then ignited or compressed to drive the piston to do work and generate power. High pressure is generated during both the compression and combustion of the air-fuel mixture. The compressed mixture can leak into the crankcase through gaps between the piston and cylinder, piston ring openings, and gaps between the piston rings and cylinder, thus forming crankcase blow-by. Because blow-by contains harmful components, it needs to be drawn into the combustion chamber from the intake system, burned, and then discharged through the exhaust pipe. Since the crankcase contains a large amount of high-temperature engine oil and oil vapor, the blow-by carries oil vapor as it passes through the crankcase, forming oil vapor. If this oil directly enters the combustion system with the blow-by, it will lead to deterioration of combustion and emissions. Therefore, it is necessary to separate the oil droplets from the oil vapor.

[0046] Meanwhile, when the engine burns fuel, it produces some byproducts, including water vapor. This water vapor can escape into the crankcase through gaps between the piston and cylinder, piston ring openings, and other openings. In cases of incomplete combustion, even more water vapor may be produced. If the engine operates under low load for an extended period, such as idling or light load, the temperature inside the crankcase may not be sufficient to completely evaporate or expel this water vapor. As this vapor cools, it condenses into liquid water.

[0047] In cold winter regions, in extremely cold environments, especially when the outside temperature is low enough, condensation in the crankcase passages may freeze, forming ice and clogging the crankcase ventilation pipes. If the crankcase passages are blocked, fuel vapors cannot escape from the crankcase in a timely manner, affecting normal ventilation and fuel vapor recovery. Over time, this can lead to excessive pressure inside the crankcase, causing oil leaks from the front and rear oil seals, and in severe cases, potentially resulting in decreased engine performance or other mechanical failures.

[0048] According to an embodiment of the present invention, the cylinder head assembly 100, by providing a small-load channel 31 of the oil-gas separator 3 connected to the cylinder head cover intake channel 21 and the cylinder head intake channel 11, allows the blow-by gas generated after engine operation entering the oil-gas separator 3 to undergo oil-gas separation in the oil-gas separator 3. The separated gas then sequentially enters the cylinder head cover intake channel 21 and the cylinder head intake channel 11 through the small-load channel 31, allowing the blow-by gas to be introduced into the combustion chamber for re-combustion. Furthermore, by setting the included angle α2 between the small-load channel 31 and the top surface 13 of the cylinder head to be within the range of 30° to 90°, the blow-by gas in the small-load channel 31 can be rapidly discharged using its gravity. The airflow to the cylinder head cover intake passage 21 increases the outflow rate of blow-by gas in the low-load passage 31. This effectively reduces the risk of the separated gas in the low-load passage 31 freezing and clogging the gas passage, leading to excessive crankcase pressure, which in turn causes engine oil leakage, reduced engine performance, or mechanical failure. This also effectively reduces the risk of icing in the cylinder head cover intake passage 21 and the cylinder head intake passage 11, improving the reliability of engine operation. At the same time, the low-load passage 31, cylinder head cover intake passage 21, and cylinder head intake passage 11 are built-in, eliminating the need for external piping, which facilitates engine mounting and layout, and effectively reduces development costs.

[0049] Furthermore, the low-load channel 31 has multiple configuration options, making it suitable for both inline and V-type engines. Its structural arrangement is reliable and its applicability is wider.

[0050] In some embodiments, the cylinder head cover intake passage 21 includes a cylinder head cover first passage 211, which is connected to the outlet end of the low load passage 31. The angle between the length direction of the cylinder head cover first passage 211 and the top surface 13 of the cylinder head is a3, and satisfies: 30°≤a3≤90°.

[0051] Specifically, the cylinder head cover intake passage 21 includes a cylinder head cover first passage 211. The inlet end of the cylinder head cover first passage 211 is connected to the outlet end of the low load passage 31, which allows the blow-by gas separated in the oil-gas separator 3 to enter the low load passage 31 and flow into the cylinder head cover first passage 211 from the outlet end of the low load passage 31. This allows the blow-by gas to enter the cylinder head cover intake passage 21 and flow into the cylinder head intake passage 11 sequentially through the other multiple intake passages of the cylinder head cover 2.

[0052] Furthermore, the extension direction of the first channel 211 of the cylinder head cover intersects with the top surface 13 of the cylinder head, resulting in an angle between them, which is a3. a3 can take values ​​such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc. By setting the above multiple values, there are more ways to set the first channel 211 of the cylinder head cover. Moreover, when a3 is larger, the gas (blow-through gas) flowing into the first channel 211 of the cylinder head cover can better flow out through the first channel 211 of the cylinder head cover by combining with the effect of gravity.

[0053] The angle between the length direction of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head cannot be set too small, otherwise it will reduce the flow rate of gas in the first channel 211 of the cylinder head cover.

[0054] Therefore, the above-mentioned arrangement facilitates the reduction of the obstruction to the flow of separated gas by the change of the air passage from the low-load passage 31 to the cylinder head cover first passage 211, and can effectively reduce the pressure loss of the intake passage to meet the required gas flow rate.

[0055] In some embodiments, a2 = a3, that is, the angle between the length direction of the low-load channel 31 and the top surface 13 of the cylinder head and the angle between the length direction of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head are equal. This makes the extension direction of the low-load channel 31 consistent with the extension direction of the first channel 211 of the cylinder head cover, so that the flow state of the gas after oil-gas separation in the low-load channel 31 and the first channel 211 of the cylinder head cover is consistent. In this way, the gas in the first channel 211 of the cylinder head cover can form a particularly high throughput efficiency, effectively reducing the flow resistance of the oil-gas separator 3 at the outlet end of the low-load channel 31, preventing the risk of poor exhaust of the oil-gas separator 3 and reducing the oil-gas separation efficiency, thereby increasing the flow velocity of blow-by gas in the crankcase in the low-load channel 31 and the first channel 211 of the cylinder head cover, improving the oil-gas separation efficiency, and reducing the risk of icing in the low-load channel 31 and the first channel 211 of the cylinder head cover in extremely cold environments.

[0056] Furthermore, the angle between the length direction of the low-load channel 31 and the top surface 13 of the cylinder head and the angle between the length direction of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head can be set to be unequal. However, the angle between the length direction of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head can be set to be close to the angle between the length direction of the low-load channel 31 and the top surface 13 of the cylinder head according to the actual space size, so as to reduce the flow resistance of the oil-gas separator 3 at the outlet end of the low-load channel 31.

[0057] In some embodiments, the cylinder head cover intake passage 21 further includes a cylinder head cover second passage 212, a cylinder head cover third passage 213, and a cylinder head cover fourth passage 214 that are sequentially connected to the cylinder head cover first passage 211. The length directions of any two adjacent 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 form an included angle, and the cylinder head cover fourth passage 214 is connected to the cylinder head intake passage 11.

[0058] The oil-gas separator 3 is connected above the cylinder head cover 2 and is located on the exhaust side of the cylinder head cover 2. It can be arranged parallel to the mounting surface of the cylinder head cover 2 or at a certain angle to the mounting surface of the cylinder head cover 2. A small load channel 31 is formed inside the oil-gas separator 3.

[0059] Specifically, the cylinder head cover intake passage 21 has four sections. The cylinder head cover intake passage 21 also includes a cylinder head cover second passage 212, a cylinder head cover third passage 213, and a cylinder head cover fourth passage 214 connected in sequence. The outlet end of the cylinder head cover first passage 211 is connected to the inlet end of the cylinder head cover second passage 212. That is, the 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 are connected in sequence from the exhaust side to the intake side. The outlet end of the cylinder head cover fourth passage 214 is connected to the cylinder head intake passage 11, which can form a complete gas passage for the oil-gas separator 3, cylinder head cover 2, and cylinder head 1.

[0060] Furthermore, under low-load conditions, blow-by gas in the crankcase enters the oil-gas separator 3. The gas separated by the oil-gas separator 3 flows to the low-load passage 31, and then flows sequentially into the 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. It then enters the cylinder head intake passage 11 from the outlet end of the cylinder head cover fourth passage 214, and finally enters the combustion chamber for combustion.

[0061] Among them, the length directions of any two adjacent channels of cylinder head cover 111, cylinder head cover 212, cylinder head cover 213 and cylinder head cover 214 form an angle. That is to say, cylinder head cover 111 can be distributed intersecting with cylinder head cover 212, or cylinder head cover 212 can be distributed intersecting with cylinder head cover 313, or cylinder head cover 313 can be distributed intersecting with cylinder head cover 414. The arrangement is diverse and can be flexibly selected.

[0062] Specifically, such as Figure 2As shown, the cylinder head cover first channel 211, cylinder head cover second channel 212, cylinder head cover third channel 213 and cylinder head cover fourth channel 214 extend in different directions and intersect each other. The cylinder head cover first channel 211, cylinder head cover second channel 212, cylinder head cover third channel 213 and cylinder head cover fourth channel 214 are all located outside the valve chamber cavity 24 of the cylinder head cover 2. The space outside the valve chamber cavity 24 can be used to arrange the four cylinder head intake channels 11, making the overall structure more compact. The cylinder head cover first channel 211, cylinder head cover second channel 212, cylinder head cover third channel 213 and cylinder head cover fourth channel 214 are all arranged inside the cylinder head cover 2, eliminating the need for external pipelines, which facilitates the installation and arrangement of the engine and effectively reduces development costs.

[0063] 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.

[0064] Among them, such as Figure 2 As shown, the cylinder head cover second passage 212 and cylinder head cover third passage 213 are provided with plugs 23 at their ends away from each other, which can seal the cylinder head cover second passage 212 and cylinder head cover third passage 213 at their 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. The two valve chambers 24 are respectively distributed with the intake valve and the exhaust valve. The valve chamber 24 on the intake side is provided with an intake camshaft hole 25 for installing the intake camshaft. The opening and closing of the intake valve can be precisely controlled by rotating the intake camshaft. The valve chamber 24 on the exhaust side is provided with an exhaust camshaft hole 26 for installing the exhaust camshaft. The opening and closing of the exhaust valve can be precisely controlled by rotating the exhaust camshaft.

[0065] In some embodiments, the angle between the length direction of the second channel 212 of the cylinder head cover and the top surface 13 of the cylinder head is a4, and the angle between the length direction of the third channel 213 of the cylinder head cover and the top surface 13 of the cylinder head is a5, and satisfies: a5≤a4≤a3.

[0066] Specifically, the extension direction of the second channel 212 of the cylinder head cover intersects with the top surface 13 of the cylinder head, resulting in an angle between them, and the angle is a4. The extension direction of the third channel 213 of the cylinder head cover intersects with the top surface 13 of the cylinder head, resulting in an angle between them, and the angle is a5. The second channel 212 and the third channel 213 of the cylinder head cover are the rear channels of the first channel 211 of the cylinder head cover. In the design, a4 and a5 are respectively related to a3. In the actual design, a4 and a5 can be less than a3, and a4 and a5 can be equal to a3. The setting methods are diverse and can be set according to the actual space.

[0067] Furthermore, when a4 and a5 are set to be less than or equal to a3, the gas (blow-by gas) in the first channel 211 of the cylinder head cover can more easily flow through the second channel 212 and the third channel 213 of the cylinder head cover to the fourth channel 214 of the cylinder head cover, thereby increasing the gas flow rate in the intake channel 21 of the cylinder head cover, so that the gas separated by the oil-gas separator 3 flows into the cylinder head intake channel 11 through the intake channel 21 of the cylinder head cover.

[0068] Among them, the included angle between a4 and a5 can be different. In this case, a5 can be set to be smaller than a4, which can increase the gas flow rate from the second channel 212 of the cylinder head cover to the third channel 213 of the cylinder head cover. A5 and a4 can also be the same. For inline engines, the second channel 212 and the third channel 213 of the cylinder head cover can be integrated into one channel, reducing the number of gas channels and making it easier for blow-by gas to flow in the channel.

[0069] In some embodiments, the following conditions are met: a4≤a1≤a3, that is, the angle between the length direction of the first cylinder head cover channel 211 and the top surface 13 of the cylinder head is greater than or equal to the angle between the top surface 13 of the cylinder head and the longitudinal center plane 200 of the engine, and the angle between the top surface 13 of the cylinder head and the longitudinal center plane 200 of the engine is greater than or equal to the angle between the length direction of the second cylinder head cover channel 212 and the top surface 13 of the cylinder head, and the angle between the length direction of the second cylinder head cover channel 212 and the top surface 13 of the cylinder head is greater than or equal to the angle between the length direction of the third cylinder head cover channel 213 and the top surface 13 of the cylinder head, i.e., a5≤a4≤a1≤a3. In this way, when the four angles are different, and in the lateral direction of the engine, with the flow direction of blow-by air in the cylinder head cover intake channel 21, the first cylinder head cover channel 211, the second cylinder head cover channel 212 and the third cylinder head cover channel 213 are continuously lowered, and the blow-by air can be better discharged from the cylinder head cover intake channel 21 by utilizing the gravity difference.

[0070] Among them, such as Figure 2As shown, the second channel 212 and the third channel 213 of the cylinder head cover have the same angle with the top surface 13 of the cylinder head, and the second channel 212 and the third channel 213 of the cylinder head cover are symmetrically distributed with respect to the connection between them. The second channel 212 and the third channel 213 of the cylinder head cover are lowered sequentially to increase the airflow velocity. The entire cylinder head cover intake channel 21 is reasonably arranged and occupies little space, thus improving the space utilization rate of the cylinder head cover 2.

[0071] Therefore, through the above settings, in cold winter regions or extremely cold environments, when the engine is running under low load, the risk of the separated gas in the low load channel 31 easily freezing and blocking the gas channel, leading to excessive crankcase pressure, which in turn causes engine oil leakage, engine performance degradation, or mechanical failure, can be effectively reduced.

[0072] In some embodiments, the distance between the inlet end of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head is h1, and the distance between the inlet end of the fourth channel 214 of the cylinder head cover and the top surface 13 of the cylinder head is h2, and the following conditions are met: h1 > h2.

[0073] Specifically, the cylinder head cover 2 is connected to the upper part of the top surface 13 of the cylinder head, and the inlet end of the first channel 211 of the cylinder head cover is higher than the top surface 13 of the cylinder head, that is, the inlet end of the first channel 211 of the cylinder head cover is spaced apart from the top surface 13 of the cylinder head, and the distance between the inlet end of the first channel 211 of the cylinder head cover and the top surface 13 of the cylinder head is h1. The inlet end of the fourth channel 214 of the cylinder head cover is higher than the top surface 13 of the cylinder head, that is, the inlet end of the fourth channel 214 of the cylinder head cover is spaced apart from the top surface 13 of the cylinder head, and the distance between the inlet end of the fourth channel 214 of the cylinder head cover and the top surface 13 of the cylinder head is h2. Wherein, h1>h2, the height difference due to gravity can be effectively utilized to facilitate the flow of blow-by gas in the fourth channel 214 of the cylinder head cover to the cylinder head intake channel 11, thereby improving the flow rate of blow-by gas.

[0074] And such as Figure 2 As shown, the blow-by gas in the second channel 212 and the third channel 213 of the cylinder head cover flows downward in sequence, which more effectively increases the flow velocity from the first channel 211 to the fourth channel 214 of the cylinder head cover, thereby increasing the flow velocity of the airflow to the cylinder head intake channel 11.

[0075] In some embodiments, the inner diameters of the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover are all configured to be greater than or equal to the inner diameter of the low-load channel 31.

[0076] In this way, the cross-sectional areas of the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover are all greater than or equal to the cross-sectional area of ​​the low-load channel 31. This increases the flow area of ​​gas from the low-load channel 31 to the intake channel 21 of the cylinder head cover, thereby improving gas permeability and further reducing the risk of the separated gas in the low-load channel 31 easily freezing and blocking the gas passage.

[0077] Specifically, the inner diameters of the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover can all be set to be larger than the inner diameter of the low-load channel 31. Alternatively, the inner diameters of the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover can all be set to be equal to the inner diameter of the low-load channel 31. Both methods can maintain a certain gas flow rate and improve gas permeability.

[0078] like Figure 2 As shown, the inner diameter of the small load channel 31 is b1, the inner diameter of the first channel 211 of the cylinder head cover is b2, the inner diameter of the second channel 212 of the cylinder head cover is b3, the inner diameter of the third channel 213 of the cylinder head cover is b4, and the inner diameter of the fourth channel 214 of the cylinder head cover is b5. It can be set that the inner diameter of the first channel 211 of the cylinder head cover is equal to the inner diameter of the small load channel 31, and the inner diameters of the second channel 212 and the third channel 213 of the cylinder head cover are both greater than the inner diameter of the small load channel 31, and the inner diameter of the fourth channel 214 of the cylinder head cover is equal to the inner diameter of the small load channel 31.

[0079] Among them, the inner diameters of the first channel 211, the second channel 212, the third channel 213, and the fourth channel 214 of the cylinder head cover must not be less than the inner diameter of the low-load channel 31. When the inner diameters of the above four channels are less than the inner diameter of the low-load channel 31, the gas flow area will be reduced, the gas permeability will be reduced, and long-term operation will increase the risk that the separated gas in the low-load channel 31 will easily freeze and block the gas passage.

[0080] And such as Figure 2 As shown, the length direction of the fourth channel 214 of the cylinder head cover intersects with the top surface 13 of the cylinder head, and the included angle between them is a6. In this way, the gas in the fourth channel 214 of the cylinder head cover can flow from the cylinder head cover 2 into the cylinder head intake channel 11 at a certain inclined angle, thereby increasing the gas flow speed.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] In some embodiments, the upper end of the first cylinder head channel 111 is connected to the lower end of the cylinder head cover intake channel 21, the lower end of the first cylinder head channel 111 is bent and connected to one end of the second cylinder head channel 112, the other end of the second cylinder head channel 112 is connected to the upper end of the third cylinder head channel 113, and the lower end of the third cylinder head channel 113 is connected to the engine intake channel 12.

[0085] Specifically, such as Figure 2 and Figure 3As shown, the cylinder head first channel 111, cylinder head second channel 112, and cylinder head third channel 113 are sequentially connected in the vertical direction. The lower end of the cylinder head cover intake channel 21 is connected to the upper end of the cylinder head first channel 111. In this embodiment, the lower end of the cylinder head cover fourth channel 214 is connected to the upper end of the cylinder head first channel 111, and the lower end of the cylinder head first channel 111 is bent and connected to one end of the cylinder head second channel 112. The cylinder head second channel 112 extends along the distribution direction of the multiple combustion chambers, that is, the cylinder head second channel 112... The length direction intersects with the length direction of the first cylinder head channel 111, allowing them to be arranged on different planes. The other end of the second cylinder head channel 112 is connected to the upper end of the third cylinder head channel 113. The third cylinder head channel 113 is on the same plane as the first cylinder head channel 111, but distributed on a different plane from the second cylinder head channel 112. The lower end of the third cylinder head channel 113 is connected to the engine intake passage 12, forming a complete airflow path from the cylinder head cover intake passage 21, the cylinder head intake passage 11 to the engine intake passage 12.

[0086] Furthermore, the gas after oil-gas separation flows from the lower end of the cylinder head cover intake passage 21 into the cylinder head first passage 111, and from the lower end of the cylinder head first passage 111 into the cylinder head second passage 112. The gas in the cylinder head second passage 112 can flow to multiple combustion chambers along its extension direction. The gas in the cylinder head second passage 112 flows downward into the cylinder head third passage 113, and from the lower end of the cylinder head third passage 113 into the engine intake manifold 12. Finally, it flows into the combustion chamber together with the fresh air in the engine intake manifold 12 for combustion.

[0087] Among them, such as Figure 1 As shown, the oil-gas separator 3 is located in the middle of multiple combustion chambers, and the low-load passage 31 and the cylinder head cover intake passage 21 are distributed along the middle of the multiple combustion chambers. The number of engine intake passages 12 is matched with the number of combustion chambers, which allows the gas in the engine intake passage 12 to flow into the combustion chamber at a high speed, improving the engine's combustion efficiency. Furthermore, each engine intake passage 12 is connected to at least one cylinder head third passage 113, allowing gas to flow into each engine intake passage 12 and enabling a more even distribution of gas from the cylinder head second passage 112 into each engine intake passage 12.

[0088] Therefore, by setting the cylinder head first channel 111 and cylinder head second channel 112 to be bent and connected, the two can be distributed on different planes. This allows the airflow in one cylinder head first channel 111 to flow through the cylinder head second channel 112 to multiple combustion chambers, and then through the cylinder head third channel 113 corresponding to each combustion chamber to flow into the corresponding engine intake manifold 12. In this way, the gas flowing into different engine intake manifolds 12 can be more evenly distributed, avoiding excessive gas in a single engine intake manifold 12, which could lead to abnormal combustion. This improves the engine's operational stability and safety, and the overall gas passage layout is simple, easy to process, and reduces processing costs.

[0089] In some embodiments, the cylinder head cover 2 is made of a metal material, which has good thermal conductivity, helps the engine to quickly reach its optimal operating temperature, and facilitates the exchange of heat between the engine and the cooling system, thereby reducing the temperature of the cylinder head cover 2, keeping the engine temperature within a stable range, improving the engine's working efficiency, and the metal material is easy to process, which can achieve high processing precision, thus helping to improve the processing precision and performance of the cylinder head cover intake passage 21.

[0090] Furthermore, the metal materials include aluminum alloy or magnesium alloy. That is to say, the cylinder head cover 2 can be made of aluminum alloy or magnesium alloy, with various installation methods and flexible selection. Aluminum alloy and magnesium alloy are lightweight, have good heat transfer capacity and good machinability. This allows the cylinder head cover 2 to be lighter, reducing the overall weight of the engine and meeting the requirements of lightweight design. Its good heat transfer capacity is beneficial for heat transfer between the cylinder head cover 2 and the cylinder head 1 to meet the heat requirements of the engine. Its good machinability facilitates the machining of the cylinder head cover intake passage 21 and ensures the reliability of the gas passage, thereby improving the stability of gas flow.

[0091] The present invention also proposes an engine.

[0092] An engine according to an embodiment of the present invention includes a cylinder head assembly 100 of any of the above embodiments. The cylinder head assembly 100 is a part of the engine structure. The cylinder head assembly 100 includes an oil-gas separator 3, a cylinder head cover 2, and a cylinder head 1. By setting a low-load passage 31 of the oil-gas separator 3 to communicate with the cylinder head cover intake passage 21 and the cylinder head intake passage 11, the blow-by gas entering the oil-gas separator 3 after the engine is running can be separated into oil and gas in the oil-gas separator 3. The separated gas enters the cylinder head cover intake passage 21 and the cylinder head intake passage 11 sequentially from the low-load passage 31, and can be introduced into the combustion chamber for re-combustion. Furthermore, by setting the included angle α2 between the low-load passage 31 and the top surface 13 of the cylinder head to be within the range of 30° to 90°, the blow-by gas in the low-load passage 31 can flow quickly to the cylinder head cover intake passage 21 by gravity, thereby increasing the outflow rate of the blow-by gas in the low-load passage 31. This can effectively reduce the risk of the separated gas in the low-load passage 31 freezing and blocking the gas passage, leading to excessive crankcase pressure, which in turn can cause engine oil leakage, engine performance degradation, or mechanical failure. This effectively reduces the risk of icing in the cylinder head cover intake passage 21 and the cylinder head intake passage 11, and improves the reliability of engine operation.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylinder head assembly, characterized in that, 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 connected to the upper part of the cylinder head, and the oil-gas separator is connected to the upper part of 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 between the low-load passage and the intake passage of the cylinder head. The cylinder head has a top surface for connection with the cylinder head cover, the angle between the top surface of the cylinder head and the longitudinal center plane of the engine is a1, the angle between the length direction of the small load channel and the top surface of the cylinder head is a2, and satisfies: 0°<a1<90°, 30°≤a2≤90°.

2. The cylinder head assembly according to claim 1, characterized in that, The cylinder head cover intake channel includes a cylinder head cover first channel, which is connected to the outlet end of the low load channel. The angle between the length direction of the cylinder head cover first channel and the top surface of the cylinder head is a3, and satisfies: 30°≤a3≤90°.

3. The cylinder head assembly according to claim 2, characterized in that, The following condition is met: a2 = a3.

4. The cylinder head assembly according to claim 2, characterized in that, The cylinder head cover intake passage also includes a cylinder head cover second passage, a cylinder head cover third passage, and a cylinder head cover fourth passage that are sequentially connected to the cylinder head cover first passage. Any two adjacent cylinder head cover first passage, cylinder head cover second passage, cylinder head cover third passage, and cylinder head cover fourth passage form an angle in their length directions. The cylinder head cover fourth passage is connected to the cylinder head intake passage.

5. The cylinder head assembly according to claim 4, characterized in that, The angle between the length direction of the second channel of the cylinder head cover and the top surface of the cylinder head is a4, and the angle between the length direction of the third channel of the cylinder head cover and the top surface of the cylinder head is a5, and the following conditions are met: a5≤a4≤a3.

6. The cylinder head assembly according to claim 5, characterized in that, It satisfies: a4≤a1≤a3.

7. The cylinder head assembly according to claim 4, characterized in that, The distance between the inlet end of the first channel of the cylinder head cover and the top surface of the cylinder head is h1, and the distance between the inlet end of the fourth channel of the cylinder head cover and the top surface of the cylinder head is h2, and the following condition is met: h1 > h2.

8. The cylinder head assembly according to claim 4, characterized in that, The inner diameters of the first, second, third, and fourth channels of the cylinder head cover are all configured to be greater than or equal to the inner diameter of the low-load channel.

9. The cylinder head assembly according to claim 1, characterized in that, 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. And / or, the upper end of the first cylinder head channel is connected to the lower end of the cylinder head cover intake channel, the lower end of the first cylinder head channel is bent and connected to one end of the second cylinder head channel, the other end of the second cylinder head channel is connected to the upper end of the third cylinder head channel, and the lower end of the third cylinder head channel is connected to the engine intake manifold.

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

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