Cylinder head lubrication system and engine

Abstract

The application relates to the engine technical field and discloses a cylinder cover lubricating system and an engine. One end of a first supply unit is communicated with a cylinder body oil channel, and the other end is communicated with an air intake side lubricating part and an exhaust side lubricating part, so as to supply lubricating oil to the air intake side lubricating part and the exhaust side lubricating part; a pre-supply unit comprises: a plurality of air intake side oil grooves and a plurality of exhaust side oil grooves, the air intake side oil grooves are arranged correspondingly to air intake side cam bearing holes, the exhaust side oil grooves are arranged correspondingly to exhaust side cam bearing holes, the pre-supply unit is spaced apart from the first supply unit, and is adapted to store lubricating oil. Thus, the pre-supply unit establishes an initial oil film before the engine starts, and cooperates with the first supply unit to quickly maintain the stability of the oil film after the engine starts, so that the working stability of the engine can be improved, the wear of friction pairs can be effectively relieved, and the service life of the engine can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a cylinder head lubrication system and an engine. Background Technology

[0002] In related technologies, when the engine stops working, the lubricating oil on the various friction pairs inside the engine will flow back to the oil pan. When the engine starts, whether a mechanical oil pump or an electronic oil pump is used, the pumped lubricating oil needs a certain amount of time to move to the various friction pairs and form an oil film. As a result, in the early stage of engine start-up, the friction pairs will inevitably experience hard friction without lubrication protection, which may even lead to the camshaft or crankshaft seizing. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cylinder head lubrication system that can form an oil film more promptly, thereby reducing wear on the friction pairs, improving the reliability and stability of the engine, reducing wear, and extending its service life.

[0004] This application further proposes an engine employing the aforementioned cylinder head lubrication system.

[0005] In a first aspect, this application provides a cylinder head lubrication system, comprising: an intake-side lubrication section, an exhaust-side lubrication section, a first supply unit, and a pre-supply unit. There are multiple intake-side and exhaust-side lubrication sections. The intake-side lubrication section comprises an intake-side camshaft bearing hole and an intake valve tappet mounting hole, and the exhaust-side lubrication section comprises an exhaust-side camshaft bearing hole and an exhaust valve tappet mounting hole. One end of the first supply unit is connected to a cylinder block oil passage, and the other end is connected to the intake-side and exhaust-side lubrication sections to supply lubricating oil to them. The pre-supply unit comprises multiple intake-side oil grooves and multiple exhaust-side oil grooves, with the intake-side oil grooves corresponding to the intake-side camshaft bearing holes and the exhaust-side oil grooves corresponding to the exhaust-side camshaft bearing holes. The pre-supply unit is spaced apart from the first supply unit and is adapted to store lubricating oil.

[0006] According to the cylinder head lubrication system of this application embodiment, an initial oil film is established before engine start by a pre-supply unit, and in conjunction with a first supply unit, the oil film is quickly maintained after engine start, which can improve the working stability of the engine, effectively reduce the wear of the friction pairs, and extend the service life of the engine.

[0007] According to some embodiments of this application, the intake-side oil groove is located at the bottom end of the intake-side cam bearing hole, and the exhaust-side oil groove is located at the bottom end of the exhaust-side cam bearing hole.

[0008] According to some embodiments of this application, the arc length of the exhaust-side oil groove is less than or equal to half the arc length of the exhaust-side cam bearing hole, the arc length of the intake-side oil groove is less than or equal to half the arc length of the intake-side cam bearing hole, and / or the width of the exhaust-side oil groove is less than or equal to the width of the exhaust-side cam bearing hole, and the width of the intake-side oil groove is less than or equal to the width of the intake-side cam bearing hole.

[0009] According to some embodiments of this application, the first supply unit includes: a first upper oil passage, a first branch oil passage, an intake-side branch oil passage and an exhaust-side branch oil passage, an intake-side supply oil passage, and an exhaust-side supply oil passage. One end of the first upper oil passage is connected to the cylinder block oil passage, and the other end is connected to the first branch oil passage. The first branch oil passage is connected to the intake-side branch oil passage and the exhaust-side branch oil passage. The exhaust-side branch oil passage is connected to the exhaust-side supply oil passage and the exhaust valve tappet mounting hole. The intake-side branch oil passage is connected to the intake-side supply oil passage and the intake valve tappet mounting hole. The intake-side supply oil passage is connected to the intake-side camshaft bearing hole. The exhaust-side supply oil passage is connected to the exhaust-side camshaft bearing hole.

[0010] According to some embodiments of this application, in the vertical direction, the area where the intake-side oil groove intersects with the intake-side cam bearing hole is located below the area where the intake-side supply oil passage intersects with the intake-side cam bearing hole, and the area where the exhaust-side oil groove intersects with the exhaust-side cam bearing hole is located below the area where the exhaust-side supply oil passage intersects with the exhaust-side cam bearing hole.

[0011] According to some embodiments of this application, the intake-side oil groove is located at the front end of the intake-side oil supply passage in the direction of intake camshaft rotation, and the exhaust-side oil groove is located at the front end of the exhaust-side oil supply passage in the direction of exhaust camshaft rotation.

[0012] According to some embodiments of this application, the cylinder head lubrication system further includes: a high-pressure oil pump lubrication section, which includes: an oil pump supply passage, an annular oil passage, a vertical oil passage, and a horizontal oil passage. One end of the oil pump supply passage is connected to the first supply unit, and the other end of the oil pump supply passage is connected to the annular oil passage. The annular oil passage, the vertical oil passage, and the horizontal oil passage are connected in sequence, and the horizontal oil passage is connected to the oil pump tappet mounting hole to lubricate the high-pressure oil pump.

[0013] According to some embodiments of this application, the annular oil passage is arranged around one of the intake-side camshaft bearing holes, and the oil pump supply passage is located on the periphery of the intake-side camshaft bearing hole.

[0014] According to some embodiments of this application, the cross-sectional shape of the intake-side oil groove and the exhaust-side oil groove is any one of circular, elliptical, or rectangular.

[0015] Secondly, this application provides an engine, including: the cylinder head lubrication system described in the above embodiments.

[0016] Additional aspects and advantages of this 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

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of an engine according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the cooperation of the engine lubrication system, intake camshaft, and exhaust camshaft according to an embodiment of this application. Figure 3 This is a schematic diagram of a cylinder head lubrication system according to an embodiment of this application; Figure 4 This is a side view schematic diagram of a cylinder head lubrication system according to an embodiment of this application; Figure 5 This is a schematic diagram of a cylinder head according to an embodiment of this application; Figure 6 yes Figure 5 Schematic cross-section of midline AA; Figure 7 This is a schematic diagram of the cooperation between the high-pressure oil pump and the cylinder head according to an embodiment of this application.

[0018] Figure label: Engine 1000, Cylinder head lubrication system 100, cylinder block lubrication system 200, cylinder head 300, intake camshaft 400, exhaust camshaft 500, high-pressure oil pump 600, engine lubrication system 700. Intake-side lubrication section 110, intake-side camshaft bearing bore 111, front-end timing intake bearing bore 1111, intake valve tappet mounting hole 112. Exhaust-side lubrication section 120, exhaust-side camshaft bearing bore 121, front-end timing exhaust bearing bore 1211, exhaust valve tappet mounting hole 122. First supply unit 130, first upper oil passage 131, first branch oil passage 132, intake side branch oil passage 133, exhaust side branch oil passage 134, intake side supply oil passage 135, exhaust side supply oil passage 136. Second supply unit 140, second upper oil passage 141, second branch oil passage 142, timing intake upper oil passage 143, timing exhaust upper oil passage 144, branch oil passage 145. Pre-supply unit 150, intake side oil tank 151, exhaust side oil tank 152, High-pressure oil pump lubrication section 160, oil pump supply passage 161, annular oil passage 162, vertical oil passage 163, horizontal oil passage 164, oil pump tappet mounting hole 165. Oil passage 210 at the front end of the cylinder block, oil passage 220 at the rear end of the cylinder block. Camshaft thrust journal 01, high-pressure oil pump driven cam 02. Fourth circumferential hole section a, third circumferential hole section b, second circumferential hole section c, first circumferential hole section d The angle α1 between the axis of the first upper oil passage and the axis of the first branch oil passage. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0021] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 this utility model.

[0026] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0027] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0028] In related technologies, when the engine stops working, the lubricating oil on the various friction pairs inside the engine will flow back to the oil pan. When the engine starts, whether a mechanical oil pump or an electronic oil pump is used, the pumped lubricating oil needs a certain amount of time to move to the various friction pairs and form an oil film. As a result, in the early stage of engine start-up, the friction pairs will inevitably experience hard friction without lubrication protection, which may even lead to the camshaft or crankshaft seizing.

[0029] Based on this, this application proposes a cylinder head lubrication system that can quickly form an oil film between friction pairs to reduce wear and extend service life.

[0030] First, with reference to the accompanying drawings, the structure of the engine 1000 according to an embodiment of this application will be described in detail.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the engine 1000 includes: a cylinder block (not shown) and a cylinder head 300. A cylinder block lubrication system 200 is provided on the cylinder block, and a cylinder head lubrication system 100 is provided on the cylinder head 300. The cylinder block lubrication system 200 supplies lubricating oil to the cylinder head lubrication system 100 through an upper oil passage 210 at the front end of the cylinder block and an upper oil passage 220 at the rear end of the cylinder block.

[0032] The cylinder head lubrication system 100 includes: an intake-side lubrication section 110, an exhaust-side lubrication section 120, a first supply unit 130, a second supply unit 140, a pre-supply unit 150, and a high-pressure oil pump lubrication section 160.

[0033] The intake-side lubrication section 110 includes multiple intake-side camshaft bearing holes 111 and multiple intake valve tappet mounting holes 112. The exhaust-side lubrication section 120 includes multiple exhaust-side camshaft bearing holes 121 and multiple exhaust valve tappet mounting holes 122. The foremost of the multiple intake-side camshaft bearing holes 111 is defined as the front timing intake bearing hole 1111, and the foremost of the multiple exhaust-side camshaft bearing holes 121 is defined as the front timing exhaust bearing hole 1211, used to connect VVT (Variable Valve Timing) or timing chain. The first supply unit 130 and the second supply unit 140 are respectively connected to the upper oil passage 210 at the front end of the cylinder block and the upper oil passage 220 at the rear end of the cylinder block. The first supply unit 130 is connected to the intake side lubrication part 110, the exhaust side lubrication part 120 and the high-pressure oil pump lubrication part 160 to supply lubricating oil to the three respectively. The second supply unit 140 is connected to the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211 to achieve targeted lubrication oil supply to the bearing holes that are subjected to greater force during the initial start-up of the engine 1000.

[0034] It should be noted that the high-pressure oil pump lubrication section 160 is located above the intake side cam bearing hole 111 at the rear end of the cylinder head 300, adjacent to the inlet end of the first supply unit 130, so that the high-pressure oil pump lubrication section 160 can also be lubricated preferentially.

[0035] It is understood that the engine 1000 of this application embodiment, when applied to a traditional fuel vehicle, can form an oil film more quickly to reduce engine 1000 wear and extend its service life, and is especially suitable for hybrid electric vehicle scenarios.

[0036] Specifically, for hybrid electric vehicles (such as plug-in hybrids and range-extended hybrids), the engine 1000 needs to start when there is a need for charging or when the pure electric range is insufficient. Therefore, the engine 1000 is in a non-running state for a long time, and the lubricating oil of the friction pairs inside the engine 1000 will flow back into the oil pan. When the engine 1000 starts, because the hybrid electric vehicle has a strong power demand or power demand, the engine 1000 will rise to medium and high speed and load within a few seconds.

[0037] However, regardless of whether a mechanical or electronic oil pump is used, the lubricating oil pumped from the pump needs a certain flow time to reach the various friction pairs. This results in unavoidable friction without lubrication during the initial start-up of the engine. The longer the start-up interval of the engine, the greater the impact of friction without lubrication during subsequent starts. In extreme cases, dry friction can occur, leading to camshaft or crankshaft seizure. Short-term friction without lubrication has a relatively small impact on the friction pairs. However, it has a significant impact on friction pairs subjected to stress during the initial start-up, such as: the front timing intake bearing hole 1111 of the cylinder head 300 where the VVT ​​(Variable Valve Timing) or timing sprocket is installed, the front timing exhaust bearing hole 1211, and the intake-side camshaft bearing hole 111 at the rear of the cylinder head 300 that supports the high-pressure oil pump drive cam 02.

[0038] Among them, the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211 need to withstand the timing chain force of the timing system operation, and the intake side cam bearing hole 111 supporting the high-pressure oil pump drive cam 02 is mainly subjected to the reaction force of driving the high-pressure oil pump 600 to operate normally. Therefore, the surface quality of the above three cam bearing holes is significantly worse than that of other cam bearing holes. This application can use the first supply unit 130 in conjunction with the high-pressure oil pump lubrication unit 160 to achieve priority lubrication of the cam bearing holes in the area where the high-pressure oil pump 600 is located, and use the second supply unit 140 to achieve targeted lubrication of the front timing intake cam bearing hole 1111 and the front timing exhaust bearing hole 1211, so as to delay the wear of the three and improve the service life of the engine 1000.

[0039] Furthermore, this application also includes a pre-supply unit 150, which is spaced apart from the first supply unit 130, the second supply unit 140, etc., so that it can retain a certain amount of lubricating oil and will not flow back into the oil pan, which facilitates the rapid formation of an oil film in the initial stage of engine 1000 startup and can further reduce friction loss.

[0040] In summary, the engine lubrication system 700 of this application embodiment is particularly suitable for use scenarios where the engine 1000 is not started for a long time and needs to be instantly increased to medium-high speed and load after starting. It can avoid abnormal wear or even bearing seizure caused by insufficient lubrication of the friction pairs or lack of lubricating oil. Before the engine 1000 starts, the pre-supply unit 150 can form a local oil film between the friction pairs. After the camshafts (intake camshaft and exhaust camshaft) rotate, a complete oil film is formed. When the engine 1000 starts, lubricating oil can be quickly supplied to the friction pairs that are initially subjected to greater starting force. Before the working oil pressure of the lubricating oil stabilizes, an oil film is quickly formed between the friction pairs, thereby reducing friction between the friction pairs, reducing wear between the camshaft and the cam bearing bore, reducing abnormal wear between the friction pairs, improving the operational reliability of the engine 1000, and effectively improving the operational reliability of the entire vehicle.

[0041] The structure of the pre-supply unit 150 according to the embodiments of this application will now be described in detail.

[0042] First, it should be noted that the current solutions to the wear problem of engine 1000 parts during startup after a long period of inactivity are mainly achieved through the following three modes: (1) On the basis of the existing cylinder head lubrication system 100, add an auxiliary lubrication electronic oil pump and oil passage to pump lubricating oil to the oil passage before starting. However, this will increase the design, development and procurement costs of engine 1000. At the same time, the electronic oil pump is not strong enough to resist impurities and is prone to jamming, which will lead to a decrease in auxiliary lubrication performance and fail to achieve the expected effect. (2) Adding an electric heating system to heat the lubricating oil temperature will also increase the design, development and procurement costs of the engine 1000. At the same time, the high power consumption ratio will exacerbate the power loss. (3) Increase bearing wear resistance. Using materials with high wear resistance can increase the reliability of engine 1000 operation time, but does not solve the wear problem.

[0043] Based on this, this application provides a pre-supply unit 150 inside the cylinder head lubrication system 100. The pre-supply unit 150 forms a local oil film before the engine 1000 starts. After the camshafts (intake camshaft 400 and exhaust camshaft 500) rotate, a complete oil film is formed, thereby reducing friction between friction pairs, reducing wear between the camshaft and bearing bore, reducing abnormal wear between friction pairs, improving the operational reliability of the engine 1000, and also reducing the design and development costs of the engine 1000.

[0044] The following is for reference. Figures 1-7 The present invention describes a cylinder head lubrication system 100 and an engine 1000 according to embodiments of the present invention.

[0045] like Figure 2 and Figure 3 As shown, this application provides a cylinder head lubrication system 100, including: an intake-side lubrication section 110, an exhaust-side lubrication section 120, a first supply unit 130, and a pre-supply unit 150. There are multiple intake-side lubrication sections 110 and 120. The intake-side lubrication section 110 has an intake-side camshaft bearing hole 111 and an intake valve tappet mounting hole 112. The exhaust-side lubrication section 120 has an exhaust-side camshaft bearing hole 121 and an exhaust valve tappet mounting hole 122. One end of the first supply unit 130 is connected to the cylinder block. The oil passage is connected at one end and at the other end to the intake-side lubrication section 110 and the exhaust-side lubrication section 120, so as to supply lubricating oil to the intake-side lubrication section 110 and the exhaust-side lubrication section 120; the pre-supply unit 150 includes: a plurality of intake-side oil grooves 151 and a plurality of exhaust-side oil grooves 152, and the intake-side oil grooves 151 are provided corresponding to the intake-side cam bearing hole 111, and the exhaust-side oil grooves 152 are provided corresponding to the exhaust-side cam bearing hole 121. The pre-supply unit 150 is spaced apart from the first supply unit 130 and is suitable for storing lubricating oil.

[0046] The intake-side lubrication section 110 includes multiple intake-side camshaft bearing holes 111 and multiple intake valve tappet mounting holes 112. The exhaust-side lubrication section 120 includes multiple exhaust-side camshaft bearing holes 121 and multiple exhaust valve tappet mounting holes 122. The first supply unit 130 is connected to the upper oil passage 220 at the rear end of the cylinder block, and the first supply unit 130 is connected to the intake-side lubrication section 110 and the exhaust-side lubrication section 120.

[0047] The pre-supply unit 150 can establish an initial oil film in the intake side camshaft bearing bore 111 and the exhaust side camshaft bearing bore 121 before the engine 1000 is started. That is, when the engine 1000 is stopped for a long time and not started, the oil film formed between the camshaft and the camshaft bearing bore during the last operation will flow back into the oil pan, which may result in a state where there is no lubricating oil between the camshaft and the camshaft bearing bore.

[0048] Furthermore, when the engine 1000 starts, the lubricating oil stored in the intake side oil groove 151 and exhaust side oil groove 152 for a short period of time before the working oil pressure of the lubricating oil stabilizes can form an initial oil film before the working oil pressure stabilizes, thereby reducing the dry friction between the camshaft and the cam bearing hole, which are subjected to greater forces, and reducing the wear between the camshaft and the cam bearing hole.

[0049] It is understandable that the intake side oil groove 151 and the exhaust side oil groove 152 are separated from the first supply unit 130, that is, separated from the intake side oil distribution channel 133 and the exhaust side oil distribution channel 134. This ensures that when the engine 1000 is stopped, the lubricating oil stored in the intake side oil groove 151 and the exhaust side oil groove 152 will not flow back to the oil pan. At the same time, when the engine is stopped, the oil pump operates under the rotational inertia force of the crankshaft or camshaft, and the oil pressure drops rapidly. When the lubricating oil pressure is insufficient to overcome gravity to transport the lubricating oil to the intake side oil distribution channel 133 and the exhaust side oil distribution channel 134, the lubricating oil in the intake side oil groove 151 and the exhaust side oil groove 152 can make up for the camshaft lubrication during the shutdown phase.

[0050] According to the cylinder head lubrication system 100 of the present application embodiment, the pre-supply unit 150 establishes an initial oil film before the engine 1000 starts, and in conjunction with the first supply unit 130, quickly maintains the stability of the oil film after the engine 1000 starts, which can improve the working stability of the engine 1000, effectively alleviate the wear of the friction pair, and extend the service life of the engine 1000.

[0051] like Figure 6 As shown, according to some embodiments of this application, the intake side oil groove 151 is located at the bottom end of the intake side cam bearing hole 111, and the exhaust side oil groove 152 is located at the bottom end of the exhaust side cam bearing hole 121.

[0052] In this way, when the engine 1000 is in a stopped state, the lubricating oil that lubricates the intake camshaft 400 and the exhaust camshaft 500 can flow back into the intake side oil groove 151 and the exhaust side oil groove 152 under the action of its own gravity, so as to achieve the preservation of lubricating oil.

[0053] It is understood that in the embodiments of this application, the arc length of the exhaust-side oil groove 152 is less than or equal to half the arc length of the exhaust-side cam bearing hole 121, the arc length of the intake-side oil groove 151 is less than or equal to half the arc length of the intake-side cam bearing hole 111, and / or the width of the exhaust-side oil groove 152 is less than or equal to the width of the exhaust-side cam bearing hole 121, and the width of the intake-side oil groove 151 is less than or equal to the width of the intake-side cam bearing hole 111.

[0054] In this way, the two sides of the intake side oil groove 151, the two axial sides of the exhaust side oil groove 152, and at least one of the two axial sides are not connected, which can improve the retention effect of lubricating oil and prevent lubricating oil from flowing back to the oil pan.

[0055] It should be noted that the cylinder head 300 includes a cylinder head body and a cylinder head cover. The cylinder head body and the cylinder head cover enclose a space for accommodating the camshaft. The exhaust-side oil groove 152 and the intake-side oil groove 151 are both formed on the cylinder head body. Two rows of multiple arc-shaped grooves are opened on the cylinder head body, and two rows of multiple arc-shaped grooves are also opened on the cylinder head cover. The two are combined to form a row of multiple intake-side cam bearing holes 111 and a row of multiple exhaust-side cam bearing holes 121. Half of the arc length of the intake-side cam bearing hole 111 as defined in this application refers to half of the arc length of the arc-shaped groove on the cylinder head body that defines the intake-side cam bearing hole 111, and half of the arc length of the exhaust-side cam bearing hole 121 refers to half of the arc length of the arc-shaped groove on the cylinder head body that defines the exhaust-side cam bearing hole 121.

[0056] Combination Figure 2 and Figure 3 As shown, the first supply unit 130 includes: a first upper oil passage 131, a first branch oil passage 132, an intake-side branch oil passage 133 and an exhaust-side branch oil passage 134, an intake-side supply oil passage 135, and an exhaust-side supply oil passage 136. One end of the first upper oil passage 131 is connected to the cylinder block oil passage, and the other end is connected to the first branch oil passage 132. The first branch oil passage 132 is connected to the intake-side branch oil passage 133 and the exhaust-side branch oil passage 134. The exhaust-side branch oil passage 134 is connected to the exhaust-side supply oil passage 136 and the exhaust valve tappet mounting hole 122. The intake-side branch oil passage 133 is connected to the intake-side supply oil passage 135 and the intake valve tappet mounting hole 112. The intake-side supply oil passage 135 is connected to the intake-side camshaft bearing hole 111. The exhaust-side supply oil passage 136 is connected to the exhaust-side camshaft bearing hole 121.

[0057] Specifically, the first supply unit 130 has two lubricating oil supply paths. Path one is: first upper oil passage 131 → first branch oil passage 132 → intake side branch oil passage 133 → intake valve tappet mounting hole 112 and intake side supply oil passage 135 → intake side cam bearing hole 111. Path two is: first upper oil passage 131 → first branch oil passage 132 → exhaust side branch oil passage 134 → exhaust valve tappet mounting hole 122 and exhaust side supply oil passage 136 → exhaust side cam bearing hole 121.

[0058] According to some embodiments of this application, in the vertical direction, the area where the intake side oil groove 151 intersects with the intake side cam bearing hole 111 is located below the area where the intake side supply oil passage 135 intersects with the intake side cam bearing hole 111, and the area where the exhaust side oil groove 152 intersects with the exhaust side cam bearing hole 121 is located below the area where the exhaust side supply oil passage 136 intersects with the exhaust side cam bearing hole 121.

[0059] In this way, the position of the intake side oil groove 151 can be relatively lower than the intake side camshaft bearing hole 111 and lower than the intersection area between the intake side oil supply passage 135 and the intake side camshaft bearing hole 111. Similarly, the position of the exhaust side oil groove 152 can be relatively lower than the exhaust side camshaft bearing hole 121 and lower than the intersection area between the exhaust side oil supply passage 136 and the exhaust side camshaft bearing hole 121. This allows the exhaust side oil groove 152 and the intake side oil groove 151 to be deeper and have a better isolation effect. This not only prevents the lubricating oil in the intake side oil groove 151 and the exhaust side oil groove 152 from flowing back to the oil pan, but also allows more lubricating oil to be retained, thereby improving the initial oil film establishment effect before the engine 1000 starts.

[0060] like Figure 6 As shown, according to some embodiments of this application, the intake side oil groove 151 is located at the front end of the intake side oil supply passage 135 in the rotation direction of the intake camshaft 400, and the exhaust side oil groove 152 is located at the front end of the exhaust side oil supply passage 136 in the rotation direction of the exhaust camshaft 500.

[0061] In other words, relative to the intake-side oil supply passage 135 and the exhaust-side oil supply passage 136, the intake-side oil groove 151 and the exhaust-side oil groove 152 are arranged at the front end of the camshaft rotation direction. During the normal operation of the camshaft, as the camshaft rotates, an oil film is formed between the camshaft and the cam bearing hole. At the same time, the lubricating oil that is inertially thrown out can be collected and stored by the exhaust-side oil groove 152 and the intake-side oil groove 151, reducing the difficulty of collecting lubricating oil in the exhaust-side oil groove 152 and the intake-side oil groove 151.

[0062] Combination Figure 3 , Figure 4 and Figure 6 As shown, according to some embodiments of this application, the cylinder head lubrication system 100 further includes a high-pressure oil pump lubrication section 160, which includes an oil pump supply passage 161, an annular oil passage 162, a vertical oil passage 163, and a horizontal oil passage 164. One end of the oil pump supply passage 161 is connected to the first supply unit 130, and the other end of the oil pump supply passage 161 is connected to the annular oil passage 162. The annular oil passage 162, the vertical oil passage 163, and the horizontal oil passage 164 are connected in sequence, and the horizontal oil passage 164 is connected to the oil pump tappet mounting hole 165 to lubricate the high-pressure oil pump 600 (i.e., the drive tappet of the high-pressure oil pump 600).

[0063] Specifically, the pressurized lubricating oil in the intake-side oil passage 133 is supplied to the annular oil passage 162 through the oil pump supply oil passage 161. The annular oil passage 162 is arranged on the intake-side cam bearing hole 111. As part of the intake-side cam bearing hole 111, part of the lubricating oil in the annular oil passage 162 lubricates the intake-side cam bearing hole 111 where the annular oil passage 162 is located, and part of it enters the oil pump tappet mounting hole 165 through the vertical oil passage 163 and the horizontal oil passage 164 to lubricate the drive tappet in the oil pump tappet mounting hole 165 and reduce the friction and wear between the drive tappet and the oil pump tappet mounting hole 165.

[0064] like Figure 3 and Figure 4 As shown, according to some embodiments of this application, an annular oil passage 162 is provided around an intake-side camshaft bearing bore 111, and an oil pump supply passage 161 is located on the periphery of the intake-side camshaft bearing bore 111, which is located at the rear end of the cylinder head 300.

[0065] The annular oil passage 162 surrounds the intake-side camshaft bearing hole 111 located at the rear end of the cylinder head 300. The intake-side camshaft bearing hole 111 is provided with an oil pump supply passage 161 and an intake-side supply passage 135. This ensures that the lubricating oil distributed by the first branch oil passage 132 to the intake-side branch oil passage 133 first enters the intake-side camshaft bearing hole 111 with the annular oil passage 162 through the intake-side supply passage 135 to lubricate the intake camshaft and the intake-side camshaft bearing hole 111.

[0066] Simultaneously, the oil pump supplies oil through the oil passage 161 into the annular oil passage 162, vertical oil passage 163, and horizontal oil passage 164, which then flows into the oil pump tappet mounting hole 165. This lubricates the drive tappet and the oil pump tappet mounting hole 165. When the engine 1000 starts, the lubricating oil is quickly supplied to the friction pairs that experience greater initial stress. Before the working oil pressure of the lubricating oil stabilizes, an oil film is quickly formed between the friction pairs experiencing greater stress, thereby reducing friction between them. This reduces wear between the drive tappet and the oil pump tappet mounting hole 165, and reduces wear caused by poor initial lubrication between the friction pairs. This improves the working stability and reliability of the high-pressure pump, reduces its wear, and extends its service life.

[0067] It is understandable that the cylinder head 300 includes a cylinder head body and a cylinder head cover. The intake side cam bearing hole 111, which is provided with an annular oil passage 162, can be divided into four regions: the first circumferential hole section d from one end of the vertical oil passage 163 to the intake side supply oil passage 135, the second circumferential hole section c from the intake side supply oil passage 135 to the intake side oil groove 151, the third circumferential hole section b from the side end of the intake side supply oil passage 135 of the cylinder head 300, and the fourth circumferential hole section a from the side end of the cylinder cover to the end of the vertical oil passage 163.

[0068] The annular oil passage 162 surrounds the intake side cam bearing hole 111 located at the rear end of the cylinder head 300. The reaction force of the intake side cam bearing hole 111 located at the rear end to drive the high-pressure oil pump 600 to operate normally is greater than that of other intake side cam bearing holes 111. The intake side cam bearing hole 111 is correspondingly provided with an intake side oil groove 151, so that at least part of the lubricating oil in the intake side oil groove 151 can flow through the annular oil passage 162, the vertical oil passage 163, and the horizontal oil passage 164 to lubricate the drive tappet, the oil pump tappet mounting hole 165, and the fourth circumferential hole section a.

[0069] Within the annular oil passage 162, at least a portion of the lubricating oil can flow back to the first circumferential bore section d under the combined action of the rotation of the intake camshaft 400 and gravity, sequentially lubricating the first circumferential bore section d, the second circumferential bore section c, and the third circumferential bore section b. This completes the segmented and zoned lubrication of the entire intake camshaft 400 bearing bore, effectively reducing the lubrication path length of the lubricating oil and ensuring oil film coverage of the entire intake side camshaft bearing bore 111 before the working oil pressure stabilizes. This reduces wear between the drive tappet and the oil pump tappet mounting hole 165, the intake side camshaft, and the intake side camshaft bearing bore 111, and reduces wear caused by poor initial lubrication.

[0070] For example, the cross-sectional shape of the intake side oil groove 151 and the exhaust side oil groove 152 is any one of a circle, an ellipse, or a rectangle.

[0071] In this way, the projected contours of the exhaust side oil groove 152 and the intake side oil groove 151 are relatively regular, which can reduce the processing difficulty and have a good lubricating oil retention effect.

[0072] It is understood that the cylinder head lubrication system 100 of this application embodiment is disposed inside the cylinder head 300. This application provides a cylinder head 300, including the cylinder head lubrication system 100 in the above embodiment. The cylinder head 300 using the cylinder head lubrication system 100 of this application embodiment can improve the lubrication effect inside the cylinder head 300, reduce the wear of the cylinder head 300, and extend the service life of the cylinder head 300.

[0073] like Figure 1 and Figure 2 As shown, this application provides an engine lubrication system 700, including: the cylinder head lubrication system 100 and the cylinder block lubrication system 200 in the above embodiments. The cylinder block lubrication system 200 includes: an upper oil passage 210 at the front end of the cylinder block and an upper oil passage 220 at the rear end of the cylinder block. The upper oil passage 210 at the front end of the cylinder block is connected to the second supply unit 140, and the upper oil passage 220 at the rear end of the cylinder block is connected to the first supply unit 130.

[0074] This allows the lubricating oil in the oil pan to effectively lubricate the friction pairs within the cylinder through the cylinder block lubrication system 200, and further supply it to the cylinder head lubrication system 100 through the cylinder block lubrication system 200 to effectively lubricate the friction pairs within the cylinder head 300, thereby improving the lubrication effect of the engine lubrication system 700. In particular, it can quickly establish an oil film during the initial start-up of the engine 1000, effectively reducing engine wear and extending the service life of the engine 1000.

[0075] It should be noted that a second supply unit 140 may also be provided on the cylinder head lubrication system 100 to achieve targeted enhanced lubrication of bearing holes equipped with VVT or timing chains.

[0076] like Figure 3 As shown, this application provides a cylinder head lubrication system 100, including: an intake-side lubrication section 110, an exhaust-side lubrication section 120, a first supply unit 130, and a second supply unit 140.

[0077] There are multiple intake-side lubrication parts 110 and exhaust-side lubrication parts 120. The intake-side lubrication part 110 consists of an intake-side camshaft bearing hole 111 and an intake valve tappet mounting hole 112. The exhaust-side lubrication part 120 consists of an exhaust-side camshaft bearing hole 121 and an exhaust valve tappet mounting hole 122. That is, multiple intake cams are provided on the intake camshaft, and each intake cam corresponds to an intake valve tappet. Multiple exhaust cams are provided on the exhaust camshaft, and each exhaust cam corresponds to an exhaust valve tappet. The exhaust valve tappets are installed in the exhaust valve tappet mounting hole 122, and the intake valve tappets are installed in the intake valve tappet mounting hole 112. The intake valve tappets, exhaust valve tappets, intake camshaft 400, and exhaust camshaft 500 all move relative to the cylinder head 300, so they need to be lubricated, which is why they are formed as intake-side lubrication parts 110 and exhaust-side lubrication parts 120.

[0078] For example, the intake-side camshaft bearing hole 111 includes: a front timing intake bearing hole 1111 configured to connect to the timing structure and a plurality of intake-side camshaft bearing holes 111 located behind the front timing intake bearing hole 1111, and a high-pressure oil pump 600 can be installed above the rearmost intake-side camshaft bearing hole 111. The exhaust-side camshaft bearing hole 121 includes: a front timing exhaust bearing hole 1211 configured to connect to the timing structure and a plurality of exhaust-side camshaft bearing holes 121 located behind the front timing exhaust bearing hole 1211. For example, if the engine 1000 is a four-cylinder engine, it has one front timing exhaust bearing hole 1211, one front timing intake bearing hole 1111, four exhaust-side camshaft bearing holes 121, and four intake-side camshaft bearing holes 111.

[0079] One end of the first supply unit 130 is connected to the cylinder block oil passage (upper oil passage 220 at the rear end of the cylinder block), and the other end is connected to the intake side lubrication section 110 and the exhaust side lubrication section 120 to supply lubricating oil to the intake side lubrication section 110 and the exhaust side lubrication section 120; one end of the second supply unit 140 is connected to the cylinder block oil passage (upper oil passage 210 at the front end of the cylinder block), and the other end is connected to an intake side camshaft bearing hole 111 (front timing intake bearing hole 1111) and an exhaust side camshaft bearing hole 121 (front timing exhaust bearing hole 1211) located at the front end of the cylinder head 300. The first supply unit 130 and the second supply unit 140 introduce lubricating oil from both ends of the length of the cylinder head 300.

[0080] Specifically, when the engine 1000 starts, the first supply unit 130 can supply pressurized lubricating oil to the intake side camshaft bearing hole 111 (including the front timing intake bearing hole 1111), the intake valve tappet mounting hole 112, the exhaust side camshaft bearing hole 121 (including the front timing exhaust bearing hole 1211), and the exhaust valve tappet mounting hole 122 to lubricate the intake side camshaft, the exhaust side camshaft, the intake valve tappet, and the exhaust valve tappet.

[0081] The second supply unit 140 quickly supplies lubricating oil to the front timing exhaust bearing hole 1211 and the front timing intake bearing hole 1111, which are subjected to greater initial starting forces. This achieves lubrication between the intake camshaft and the camshaft thrust journal 01, and between the exhaust camshaft and the camshaft thrust journal 01. In conjunction with the lubricating oil supplied to the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211 by the first supply unit 130, it ensures that both the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211 have two lubricating oil supply paths. Before the working oil pressure of the lubricating oil stabilizes, an oil film is quickly formed in the area of ​​the camshaft thrust journal 01, which is subjected to greater forces. This reduces the friction between the friction pairs subjected to greater forces and reduces the wear between the camshaft and the bearing hole.

[0082] It should be noted that the first supply unit 130 supplies lubricating oil from the rear end of the cylinder head 300, and the second supply unit 140 supplies lubricating oil from the front end of the cylinder head 300. The second supply unit 140 is closer to the front timing exhaust bearing hole 1211, which allows for faster supply of lubricating oil to the front timing exhaust bearing hole 1211.

[0083] According to the cylinder head lubrication system 100 of this application embodiment, by setting the first supply unit 130 and the second supply unit 140, it is possible to supply lubricating oil to the intake side lubrication part 110 and the exhaust side lubrication part 120, and to specifically enhance the lubricating oil supply to the front timing exhaust bearing hole 1211 and the area of ​​the front timing exhaust bearing hole 1211 where the force is greater. This allows the friction pairs that are under greater force at the initial stage of engine 1000 to quickly form an oil film, thereby reducing wear, improving the working reliability and stability of engine 1000, and extending its service life.

[0084] Combination Figure 2 and Figure 3 As shown, the second supply unit 140 includes: a second upper oil passage 141, a second branch oil passage 142, a timing intake upper oil passage 143, and a timing exhaust upper oil passage 144. One end of the second upper oil passage 141 is connected to the cylinder block oil passage, and the other end is connected to the second branch oil passage 142. The second branch oil passage 142 is connected to the timing intake upper oil passage 143 and the timing exhaust upper oil passage 144. The timing exhaust upper oil passage 144 is connected to the front timing exhaust bearing hole 1211 located at the front end of the cylinder head 300. The timing intake upper oil passage 143 is connected to the front timing intake bearing hole 1111 located at the front end of the cylinder head 300.

[0085] Specifically, the second supply unit 140 has two lubricating oil supply paths. Path three is: second upper oil passage 141 → second branch oil passage 142 → timing intake upper oil passage 143 → front timing intake bearing hole 1111; path four is: second upper oil passage 141 → second branch oil passage 142 → timing exhaust upper oil passage 144 → front timing exhaust bearing hole 1211.

[0086] Therefore, through four lubricating oil supply paths, not only can the intake camshaft 400, exhaust camshaft 500, intake valve tappets, and exhaust valve tappets be lubricated, but the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211 can also be connected to two lubricating oil supply paths to achieve rapid lubrication and ensure that the amount of lubricating oil meets the lubrication requirements. This enhances lubrication in high-load areas, effectively reduces wear, and extends the service life of the engine 1000.

[0087] It should be noted that the second branch oil passage 142 can be connected to the timing intake upper oil passage 143 and the timing exhaust upper oil passage 144 through the branch oil passage 145.

[0088] Combination Figure 3As shown, along the length of the cylinder head 300, the timing intake upper oil passage 143 is located at the rear end of the front timing intake bearing hole 1111, and the corresponding intake side supply oil passage 135 is located at the front end of the front timing intake bearing hole 1111; the timing exhaust upper oil passage 144 is located at the rear end of the front timing exhaust bearing hole 1211, and the corresponding exhaust side supply oil passage 136 is located at the front end of the front timing exhaust bearing hole 1211.

[0089] It should be pointed out that, in combination Figure 7 As shown, the rear journal of the camshaft drives the valve rocker arm assembly at the rear of the cylinder head 300, and the front end of the camshaft thrust journal 01 drives the operation of the variable valve timing (VVT) and timing chain system. The force exerted on the camshaft by the timing chain system is much greater than the force exerted on the camshaft by the valve rocker arm assembly. This results in a small contact gap between the rear thrust surface of the camshaft thrust journal 01 and the rear thrust surface of the front timing intake bearing hole 1111, and between the rear thrust surface of the camshaft thrust journal 01 and the rear thrust surface of the front timing exhaust bearing hole 1211. When the engine 1000 initially rotates, the force it experiences is greater than that of the front thrust surface.

[0090] Based on this, this application arranges the timing intake upper oil passage 143 and the timing exhaust upper oil passage 144 at the rear ends of the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211, respectively, close to the rear thrust surface of the camshaft thrust journal 01. The intake side supply oil passage 135 and the exhaust side supply oil passage 136 are arranged at the front ends of the front timing intake bearing hole 1111 and the front timing exhaust bearing hole 1211, respectively, close to the front thrust surface of the camshaft thrust journal 01. The flow from the cylinder block front upper oil passage 210 to the front timing intake bearing hole 1111 (i.e., path three) and from the cylinder block front upper oil passage 210 to the front timing exhaust bearing hole 1211 (i.e., path four) The flow path length is shorter than that of Path 1 to the front timing intake bearing hole 1111 and Path 2 to the front timing exhaust bearing hole 1211. This allows the lubricating oil from Path 3 and Path 4 to reach the rear thrust surface of the camshaft thrust journal 01 more quickly. This enables the lubricating oil to be quickly supplied to the rear thrust surface of the camshaft thrust journal 01, which experiences greater initial starting force, when the engine starts at 1000 rpm. Before the working oil pressure of the lubricating oil stabilizes, an oil film is quickly formed on the rear thrust surface of the camshaft thrust journal 01, which experiences greater force. This reduces the friction between the friction pairs experiencing greater force and reduces wear caused by poor initial lubrication between the friction pairs.

[0091] like Figure 4 , Figure 5 and Figure 6 As shown, according to some embodiments of this application, in the height direction of the cylinder head 300, the intake side oil passage 133 is located above the exhaust side oil passage 134.

[0092] Therefore, the intake side oil passage 133 corresponding to the intake side where the high-pressure oil pump 600 is arranged is higher than the exhaust side oil passage 134 where the high-pressure oil pump 600 is not arranged, which can improve the lubrication capacity of the intake camshaft and intake side cam bearing hole 111, and the drive tappet and oil pump tappet mounting hole 165 where the high-pressure oil pump 600 is arranged.

[0093] Combination Figure 3 and Figure 4 As shown, according to some embodiments of this application, the included angle α1 between the axis of the first upper oil passage 131 and the axis of the first branch oil passage 132 is 90°-150°.

[0094] Specifically, the first upper oil passage 131 and the first branch oil passage 132 form an obtuse angle (i.e., greater than 90°), which allows the lubricating oil in the first upper oil passage 131 to enter the intake side branch oil passage 133 after impacting the inner wall of the first branch oil passage 132. This increases the amount of lubricating oil supplied to the intake side branch oil passage 133 quickly before the working oil pressure of the lubricating oil stabilizes when the engine 1000 starts, and quickly forms an oil film between the friction pairs with greater force (oil pump drive tappet and oil pump tappet mounting hole 165), thereby reducing the friction between the friction pairs with greater force.

[0095] Meanwhile, the angle a1 formed by the axes of the first upper oil passage 131 and the first branch oil passage 132 should be less than 150° (i.e., 90-150°, excluding the endpoints) to prevent excessive lubricating oil from being supplied to the intake side branch oil passage 133 when the engine 1000 starts, resulting in insufficient lubricating oil on the exhaust side, so as to ensure reliable and stable lubrication of the exhaust side lubrication section 120.

[0096] According to some embodiments of this application, a one-way valve is provided in the first oil passage 131 of the first supply unit 130 and the second oil passage 141 of the second supply unit 140, or a one-way valve is provided in the oil passage 210 at the front end of the cylinder and the oil passage 220 at the rear end of the cylinder.

[0097] Specifically, in order to further improve the initial lubrication effect when the engine 1000 starts, a one-way valve can be installed in the first upper oil passage 131 of the first supply unit 130 and the second upper oil passage 141 of the second supply unit 140, or a one-way valve can be installed in the upper oil passage 210 at the front end of the cylinder block and the upper oil passage 220 at the rear end of the cylinder block. When the engine 1000 is running, the valve opens to allow lubricating oil to enter the cylinder head lubrication system 100. After the engine 1000 stops, the one-way valve closes, which allows the lubricating oil in the cylinder head lubrication system 100 to remain and be used for lubrication of the relevant friction pairs during the next start, which is conducive to the rapid establishment of an oil film.

[0098] like Figure 1As shown, this application provides an engine 1000, including: a cylinder block, a cylinder head 300, and an engine lubrication system 700 in the above embodiments. The cylinder head lubrication system 100 is disposed in the cylinder block and the cylinder head lubrication system 100 is disposed in the cylinder head 300.

[0099] According to the embodiments of this application, the engine 1000 using the above-described engine lubrication system 700 can improve the working stability of the engine 1000, extend the service life of the engine 1000, and make the engine 1000 suitable for use scenarios where it is not frequently started and needs to operate at medium to high loads shortly after starting.

[0100] 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 present 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.

[0101] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

[0102] 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 present 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.

[0103] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylinder head lubrication system, characterized in that, include: The intake-side lubrication section (110) and the exhaust-side lubrication section (120) are multiple. The intake-side lubrication section (110) is an intake-side camshaft bearing hole (111) and an intake valve tappet mounting hole (112). The exhaust-side lubrication section (120) is an exhaust-side camshaft bearing hole (121) and an exhaust valve tappet mounting hole (122). The first supply unit (130) has one end connected to the cylinder oil passage and the other end connected to the intake side lubrication section (110) and the exhaust side lubrication section (120) to supply lubricating oil to the intake side lubrication section (110) and the exhaust side lubrication section (120). The pre-supply unit (150) includes: a plurality of intake-side oil grooves (151) and a plurality of exhaust-side oil grooves (152), wherein the intake-side oil grooves (151) are provided corresponding to the intake-side cam bearing hole (111), and the exhaust-side oil grooves (152) are provided corresponding to the exhaust-side cam bearing hole (121). The pre-supply unit (150) is spaced apart from the first supply unit (130) and is adapted to store lubricating oil.

2. The cylinder head lubrication system according to claim 1, characterized in that, The intake-side oil groove (151) is located at the bottom end of the intake-side cam bearing hole (111), and the exhaust-side oil groove (152) is located at the bottom end of the exhaust-side cam bearing hole (121).

3. The cylinder head lubrication system according to claim 1, characterized in that, The arc length of the exhaust-side oil groove (152) is less than or equal to half the arc length of the exhaust-side cam bearing hole (121), the arc length of the intake-side oil groove (151) is less than or equal to half the arc length of the intake-side cam bearing hole (111), and / or the width of the exhaust-side oil groove (152) is less than or equal to the width of the exhaust-side cam bearing hole (121), and the width of the intake-side oil groove (151) is less than or equal to the width of the intake-side cam bearing hole (111).

4. The cylinder head lubrication system according to claim 1, characterized in that, The first supply unit (130) includes: a first upper oil passage (131), a first branch oil passage (132), an intake-side branch oil passage (133), an exhaust-side branch oil passage (134), an intake-side supply oil passage (135), and an exhaust-side supply oil passage (136). One end of the first upper oil passage (131) is connected to the cylinder block oil passage, and the other end is connected to the first branch oil passage (132). The first branch oil passage (132) is connected to the intake-side branch oil passage (133) and the exhaust-side branch oil passage (136). 4) Connected, the exhaust side oil channel (134) is connected to the exhaust side supply oil channel (136) and the exhaust valve tappet mounting hole (122), the intake side oil channel (133) is connected to the intake side supply oil channel (135) and the intake valve tappet mounting hole (112), the intake side supply oil channel (135) is connected to the intake side camshaft bearing hole (111), and the exhaust side supply oil channel (136) is connected to the exhaust side camshaft bearing hole (121).

5. The cylinder head lubrication system according to claim 4, characterized in that, In the vertical direction, the area where the intake side oil groove (151) intersects with the intake side cam bearing hole (111) is located below the area where the intake side supply oil passage (135) intersects with the intake side cam bearing hole (111), and the area where the exhaust side oil groove (152) intersects with the exhaust side cam bearing hole (121) is located below the area where the exhaust side supply oil passage (136) intersects with the exhaust side cam bearing hole (121).

6. The cylinder head lubrication system according to claim 4, characterized in that, The intake-side oil groove (151) is located at the front end of the intake-side oil supply passage (135) in the direction of rotation of the intake camshaft, and the exhaust-side oil groove (152) is located at the front end of the exhaust-side oil supply passage (136) in the direction of rotation of the exhaust camshaft.

7. The cylinder head lubrication system according to claim 1, characterized in that, Also includes: The high-pressure oil pump lubrication section (160) includes: an oil pump supply passage (161), an annular oil passage (162), a vertical oil passage (163), and a horizontal oil passage (164). One end of the oil pump supply passage (161) is connected to the first supply unit (130), and the other end of the oil pump supply passage (161) is connected to the annular oil passage (162). The annular oil passage (162), the vertical oil passage (163), and the horizontal oil passage (164) are connected in sequence, and the horizontal oil passage (164) is connected to the oil pump tappet mounting hole (165) to lubricate the high-pressure oil pump (600).

8. The cylinder head lubrication system according to claim 7, characterized in that, The annular oil passage (162) is arranged around one of the intake-side cam bearing holes (111), and the oil pump supply passage (161) is located on the periphery of the intake-side cam bearing hole (111).

9. The cylinder head lubrication system according to any one of claims 1-8, characterized in that, The cross-sectional shape of the intake side oil groove (151) and the exhaust side oil groove (152) is any one of circular, elliptical and rectangular.

10. An engine, characterized in that, include: The cylinder head lubrication system according to any one of claims 1-9.

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