Cylinder assembly, engine and motorcycle

Abstract

This application relates to a cylinder assembly, an engine, and a motorcycle. The cylinder head has a mounting groove and a first mating portion located at the opening of the mounting groove. A cover has a second mating portion that mates with the first mating portion to cover the opening of the mounting groove. A valve train is located in the cylinder head within the mounting groove. A fuel injection mechanism is located in the cylinder head within the mounting groove and is used to inject fuel into the valve train. Compared to conventional technologies, this cylinder assembly, even during a cold start, allows the fuel injected by the fuel injection mechanism to effectively reach the valve train, reducing wear on the valve train and improving engine durability.

Description

Technical Field

[0001] This application relates to the technical field of motorcycles, and in particular to an engine and a motorcycle. Background Technology

[0002] The cylinder head and cylinder head cover are the core assembly structures of a motorcycle engine. They are mainly used to seal the oil passages, isolate external impurities, and prevent oil leakage and air pressure leakage. They are key components for the reliability, sealing performance and service life of the engine.

[0003] In traditional technology, the engine oil passages are located inside the cylinder head cover. These passages deliver and spray oil to lubricate the valve joints within the cylinder head, reducing frictional wear on moving parts and ensuring normal engine operation. However, during a cold start, the oil viscosity is high, and its flowability decreases. After the oil is delivered through the passages in the cylinder head cover to the oil passage holes, the high-viscosity oil's spray range is significantly reduced. The oil jet sprayed from the oil passage holes cannot accurately reach the valve joints inside the cylinder head, leading to wear on the valve joints and affecting the engine's durability. Summary of the Invention

[0004] Therefore, it is necessary to provide a cylinder assembly, engine, and motorcycle to address the problem that high-viscosity engine oil cannot be accurately sprayed to the valve joints in traditional technologies, resulting in wear of the valve joints and affecting the durability of the engine.

[0005] The technical solution is as follows:

[0006] One embodiment provides a cylinder assembly, including:

[0007] The cylinder head has an installation groove and a first docking part, the first docking part being located at the opening of the installation groove;

[0008] The cover body is provided with a second docking part, which is assembled with the first docking part so that the cover body covers the opening of the mounting groove;

[0009] Valve joint, wherein the valve joint is disposed in the cylinder head and located within the mounting slot; and

[0010] The fuel injection mechanism is located in the cylinder head and within the mounting groove, and is used to inject fuel into the valve moving pair.

[0011] In the aforementioned cylinder assembly, the first mating portion of the cylinder head mates with the second mating portion of the cover, allowing the cover to conceal the mounting groove of the cylinder head, thereby protecting the valve joints and fuel injection mechanism within the mounting groove. Because the fuel injection mechanism and valve joints are housed together in the mounting groove of the cylinder head, the distance between them is shorter. Therefore, even with a shorter spray distance for the high-viscosity fuel injected by the fuel injection mechanism, the fuel can still effectively act on the valve joints, thus achieving effective lubrication. Compared to traditional technologies, this cylinder assembly, even under cold engine start-up conditions, ensures that the fuel injected by the fuel injection mechanism can still effectively reach the valve joints, reducing wear on the valve joints and improving engine durability.

[0012] In one embodiment, the cylinder head has a third mating portion on one side along the length direction of the cylinder assembly, and the cover has a fourth mating portion on one side along the length direction. The third mating portion and the fourth mating portion are assembled to form an assembly hole. The cylinder assembly also includes a camshaft, which is located on the cylinder head and drivenly connected to the valve joint. The axis of the camshaft coincides with the axis of the assembly hole, and the distance between the axis of the assembly hole and the bottom wall of the mounting groove is less than the distance between the first mating portion and the bottom wall of the mounting groove.

[0013] In one embodiment, the third docking portion has a first assembly groove, and the fourth docking portion has a second assembly groove, wherein the opening of the first assembly groove and the opening of the second assembly groove are connected to form the assembly hole.

[0014] In one embodiment, the third docking portion is further provided with a first docking groove and a second docking groove. The first docking groove is located on one side of the third docking portion along the width direction of the cylinder assembly, and the second docking groove is located on the other side of the third docking portion along the width direction. The fourth docking portion is provided with a first docking protrusion and a second docking protrusion. The first docking protrusion is located on one side of the fourth docking portion along the width direction, and the second docking protrusion is located on the other side of the fourth docking portion along the width direction. The first docking protrusion is inserted into the first docking groove, and the second docking protrusion is inserted into the second docking groove.

[0015] In one embodiment, the first docking groove has a first groove wall connected to the groove wall of the first assembly groove, and the second docking groove has a second groove wall connected to the groove wall of the first assembly groove. The plane where the first groove wall is located, the plane where the second groove wall is located, and the axis of the assembly hole are coplanar. The first docking protrusion has a first docking surface, and the second docking protrusion has a second docking surface. The first docking surface docks with the first groove wall, and the second docking surface docks with the second groove wall.

[0016] In one embodiment, the first docking groove further has a third groove wall connected to the first groove wall, the side of the third groove wall away from the first groove wall being connected to the first docking portion, and the plane of the third groove wall being located at an obtuse angle to the plane of the first groove wall being located. The second docking groove further has a fourth groove wall connected to the second groove wall, the side of the fourth groove wall away from the second groove wall being docked to the first docking portion, and the plane of the fourth groove wall being located at an obtuse angle to the plane of the second groove wall being located.

[0017] In one embodiment, the first docking protrusion has a third docking surface for docking with the third groove wall, and the second docking protrusion has a fourth docking surface for docking with the fourth groove wall.

[0018] In one embodiment, the cylinder assembly further includes a sealing gasket, which includes a sealing protrusion, a first inclined portion, a first recess, an arched portion, a second recess, and a second inclined portion connected end to end in sequence. The sealing protrusion abuts against the first mating portion and the second mating portion, the first inclined portion abuts against the third mating surface and the third groove wall, the first recess abuts against the first mating surface and the first groove wall, the arched portion fits against the groove wall of the second assembly groove, the second recess abuts against the second mating surface and the second groove wall, and the second inclined portion abuts against the fourth mating surface and the fourth groove wall.

[0019] Another embodiment provides an engine that includes a cylinder assembly as described in any of the above embodiments.

[0020] In the aforementioned engine, the first mating portion of the cylinder head mates with the second mating portion of the cover, allowing the cover to conceal the opening of the mounting groove in the cylinder head, thereby protecting the valve joints and the fuel injection mechanism within the mounting groove. Because the fuel injection mechanism and the valve joints are both located within the mounting groove of the cylinder head, the distance between them is shorter. Therefore, even with a shorter spray distance for the high-viscosity fuel injected by the fuel injection mechanism, the fuel can still effectively act on the valve joints, thus achieving effective lubrication. Compared to traditional technologies, in the aforementioned engine, even during cold starts, the fuel injected by the fuel injection mechanism can still effectively reach the valve joints, reducing wear on the valve joints and improving engine durability.

[0021] Another embodiment provides a motorcycle that includes an engine as described in the above embodiments.

[0022] In the aforementioned motorcycle, the first mating part of the cylinder head mates with the second mating part of the cover, so that the cover covers the opening of the mounting groove of the cylinder head, thereby protecting the valve joints and the fuel injection mechanism within the mounting groove. Since the fuel injection mechanism and the valve joints are both located within the mounting groove of the cylinder head, the distance between them is shorter. Therefore, even though the injection distance of the high-viscosity fuel injected by the fuel injection mechanism is relatively short, the fuel can still effectively act on the valve joints, thus achieving effective lubrication. Compared with traditional technology, in the aforementioned motorcycle, even under cold engine start conditions, the fuel injected by the fuel injection mechanism can still effectively reach the valve joints, reducing wear on the valve joints and improving engine durability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an assembly diagram of the cylinder assembly in one embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the cylinder head structure in one embodiment of this application.

[0026] Figure 3 This is a cross-sectional view of the cylinder head in one embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the oil injection mechanism in one embodiment of this application.

[0028] Figure 5 This is a top view of the cylinder head in one embodiment of this application.

[0029] Figure 6 This is a schematic diagram of the cover in one embodiment of this application.

[0030] Figure 7 This is a schematic diagram of a sealing gasket in one embodiment of this application.

[0031] Figure 8 This is a schematic diagram showing the positional relationship between the sealing gasket and the camshaft in one embodiment of this application.

[0032] Figure 9 This is a schematic diagram showing another angle of the positional relationship between the sealing gasket and the camshaft in one embodiment of this application.

[0033] Figure 10This is a schematic diagram showing the positional relationship between the seat ring and the camshaft in one embodiment of this application.

[0034] Attached image annotations:

[0035] 100. Cylinder head; 110. First mating part; 120. Mounting groove; 130. Third mating part; 131. First assembly groove; 132. First mating groove; 1321. First groove wall; 1322. Third groove wall; 133. Second mating groove; 1331. Second groove wall; 1332. Fourth groove wall; 200. Cover body; 210. Second mating part; 220. Fourth mating part; 221. Second assembly groove; 222. First mating protrusion; 2221. First mating surface; 2222. Third mating surface; 22 3. Second mating protrusion; 2231. Second mating surface; 2232. Fourth mating surface; 300. Valve movement pair; 400. Fuel injection mechanism; 410. Fuel injection passage; 420. Nozzle; 500. Camshaft; 600. Gasket; 610. Sealing protrusion; 620. First inclined portion; 630. First recess; 640. Arched portion; 650. Second recess; 660. Second inclined portion; 670. Flange structure; 671. Positioning protrusion; 672. Extrusion portion; 700. Seat ring; 710. Timing mark. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] Please see Figures 1 to 5One embodiment of this application provides a cylinder assembly, including a cylinder head 100, a cover 200, a valve train 300, and a fuel injection mechanism 400. The cylinder head 100 has a mounting groove 120 and a first mating portion 110, which is located at the opening of the mounting groove 120. The cover 200 has a second mating portion 210, which is assembled with the first mating portion 110 to cover the opening of the mounting groove 120. The valve train 300 is disposed in the cylinder head 100 and located in the mounting groove 120. The fuel injection mechanism 400 is disposed in the cylinder head 100 and located in the mounting groove 120, and is used to inject fuel into the valve train 300.

[0043] In the aforementioned cylinder assembly, the first mating portion 110 of the cylinder head 100 is assembled with the second mating portion 210 of the cover 200 so that the cover 200 covers the opening of the mounting groove 120 of the cylinder head 100, thereby protecting the valve joint 300 and the fuel injection mechanism 400 within the mounting groove 120. Since the fuel injection mechanism 400 and the valve joint 300 are both located within the mounting groove 120 of the cylinder head 100, the distance between them is shorter. Therefore, even if the high-viscosity oil injected by the fuel injection mechanism 400 has a shorter spray distance, the oil can still effectively act on the valve joint 300, thereby achieving effective lubrication of the valve joint 300. Compared with traditional technologies, the cylinder assembly described above can still effectively inject oil from the fuel injection mechanism 400 to the valve joint 300 when the engine is cold-started, reducing the wear of the valve joint 300 and improving the engine's service durability.

[0044] For explanation, please refer to Figure 1 The first docking part 110 is a docking boss structure that surrounds at least part of the mounting groove 120. The second docking part 210 corresponds to the shape of the first docking part 110 to achieve precise docking between the second docking part 210 and the first docking part 110 and reduce the gap caused by docking.

[0045] Please see Figure 4 and Figure 5 In one embodiment, the fuel injection mechanism 400 is provided with the groove wall of the mounting groove 120, and the valve moving pair 300 provided in the mounting groove 120 is located close to the groove wall on the side where the fuel injection mechanism 400 is located, thereby effectively shortening the distance between the fuel injection mechanism 400 and the valve moving pair 300. Even when the engine is cold-started, the high-viscosity oil injected from the fuel injection mechanism 400 can still be sprayed to the valve moving pair 300, thereby reducing the wear of the valve moving pair 300.

[0046] For example, in Figure 4 and Figure 5In the embodiment shown, the fuel injection mechanism 400 is disposed on one side wall of the mounting groove 120 along the width direction, and the valve movement pair 300 is disposed close to the groove wall.

[0047] In one embodiment, the oil injection mechanism 400 includes an oil injection passage 410 and a nozzle 420. The oil injection passage 410 is disposed on the groove wall of the mounting groove 120, and the nozzle 420 is connected to the oil injection passage 410 and disposed toward the valve moving pair 300 to achieve oil injection lubrication of the valve moving pair 300.

[0048] Optionally, the oil injection passage 410 can be built into the side wall of the cylinder head 100 or set in the mounting groove 120, as long as it can achieve oil injection lubrication of the valve moving pair 300, no specific limitation is made here.

[0049] Please see Figures 1 to 4 In one embodiment, the cylinder head 100 has a third mating portion 130 on one side along the length of the cylinder assembly, and the cover 200 has a fourth mating portion 220 on one side along the length. The third mating portion 130 and the fourth mating portion 220 are assembled to form an assembly hole. The cylinder assembly also includes a camshaft 500, which is disposed on the cylinder head 100 and drivenly connected to the valve movement pair 300. The axis of the camshaft 500 coincides with the axis of the assembly hole. The distance between the axis of the assembly hole and the bottom wall of the mounting groove 120 is less than the distance between the first mating portion 110 and the bottom wall of the mounting groove 120.

[0050] The third docking part 130 and the fourth docking part 220 are docked on one side of the length direction of the cover 200, and spliced ​​on one side of the length direction of the cylinder assembly to form an assembly hole. The camshaft 500 located on the cylinder head 100 is driven to connect with the valve moving pair 300 to drive the valve moving pair 300 to open and close the valve, thus meeting the basic operational requirements of the valve moving pair 300. The axis of the camshaft 500 coincides with the axis of the assembly hole, allowing the camshaft 500 to be assembled with external supporting components through the assembly hole, making assembly and maintenance operations simpler. At the same time, the distance between the axis of the assembly hole and the bottom wall of the mounting groove 120 is smaller than the distance between the first docking part 110 and the bottom wall of the mounting groove 120. In addition, the camshaft 500 and the assembly hole are arranged coaxially, so that the camshaft 500 is entirely located inside the mounting groove 120, effectively shortening the power transmission stroke between the camshaft 500 and the valve moving pair 300, reducing power loss during transmission, and improving power transmission efficiency.

[0051] For illustrative purposes, in the above embodiments, the width direction of the cylinder assembly can be understood as... Figure 1 The direction A in the diagram will not be elaborated upon here.

[0052] Furthermore, in one embodiment, the valve motion pair 300 includes a valve stem, a valve guide, and a rocker arm. The valve guide is disposed on the cylinder head 100, and the valve stem is movably disposed through the valve guide. One end of the rocker arm is connected to the camshaft 500, and the other end is connected to the valve stem. The camshaft 500 pushes the rocker arm to swing, thereby realizing the opening and closing of the valve on the valve guide.

[0053] Optionally, in some embodiments, the external supporting component can be a water pump, and the drive shaft of the water pump is connected to the camshaft 500 through a mounting hole. When the camshaft 500 rotates, it can drive the drive shaft of the water pump to rotate, so that the water pump in the engine operating chamber can work synchronously to circulate the coolant. In other feasible embodiments, the external supporting component can also be a camshaft 500 position sensor, an oil pump drive gear, etc., which will not be described in detail here.

[0054] Please see Figure 1 In one embodiment, the first docking portion 110 and the third docking portion 130 are connected end to end to form a structure that matches the groove of the mounting groove 120; the second docking portion 210 and the fourth docking portion 220 are connected end to end to form a structure on the cover 200 that matches the groove of the mounting groove 120.

[0055] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment, the third docking part 130 is provided with a first assembly groove 131, and the fourth docking part 220 is provided with a second assembly groove 221. The groove opening of the first assembly groove 131 and the groove opening of the second assembly groove 221 are connected to form an assembly hole.

[0056] The first assembly groove 131 and the second assembly groove 221 are joined together to form an assembly hole. On the one hand, the third docking part 130 of the cylinder head 100 and the fourth docking part 220 of the cover 200 only need to be machined into half-groove structures to realize the machining of the assembly hole, reducing the machining difficulty. On the other hand, the first assembly groove 131 and the second assembly groove 221 can be separated from each other by removing the cover 200 from the cylinder head 100, thereby removing the matching components set in the assembly hole and simplifying the engine assembly and maintenance operation process.

[0057] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment, the assembly hole is circular in shape. Correspondingly, the first assembly groove 131 and the second assembly groove 221 are semi-circular grooves so that they can be assembled to form a circular assembly hole. The semi-circular groove is easy to process and facilitates the disassembly and assembly of external supporting components with the first assembly groove 131 and / or the second assembly groove 221.

[0058] Please see Figure 1, Figure 2 and Figure 6 In one embodiment, the third docking portion 130 is further provided with a first docking groove 132 and a second docking groove 133. The first docking groove 132 is located on one side of the third docking portion 130 along the width direction of the cylinder assembly, and the second docking groove 133 is located on the other side of the third docking portion 130 along the width direction. The fourth docking portion 220 is provided with a first docking protrusion 222 and a second docking protrusion 223. The first docking protrusion 222 is located on one side of the fourth docking portion 220 along the width direction, and the second docking protrusion 223 is located on the other side of the fourth docking portion 220 along the width direction. The first docking protrusion 222 is inserted into the first docking groove 132, and the second docking protrusion 223 is inserted into the second docking groove 133.

[0059] When the cover 200 is assembled with the cylinder head 100, the first mating protrusions 222 and the second mating protrusions 223 on both sides of the fourth mating portion 220 can be aligned and inserted into the first mating grooves 132 and the second mating grooves 133 on both sides of the third mating portion 130, respectively. The lateral positioning of the cover 200 and the cylinder head 100 is achieved by the interlocking structure on both sides, preventing the cover 200 from shifting or misaligning along the width direction of the cylinder assembly, and ensuring that the first assembly groove 131 and the second assembly groove 221 are precisely aligned, thereby forming a complete assembly hole. At the same time, the interlocking and positioning between the mating protrusions and the mating grooves can distribute the assembly force, improve the overall structural stability of the cylinder head 100 and the cover 200 after docking, reduce the docking gap, and reduce the risk of internal oil leakage.

[0060] For illustrative purposes, in the above embodiments, the width direction of the cylinder assembly can be understood as... Figure 1 The direction B in the diagram will not be elaborated upon here.

[0061] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment, the first docking groove 132 has a first groove wall 1321 connected to the groove wall of the first assembly groove 131, and the second docking groove 133 has a second groove wall 1331 connected to the groove wall of the first assembly groove 131. The plane where the first groove wall 1321 is located, the plane where the second groove wall 1331 is located, and the axis of the assembly hole are coplanar. The first docking protrusion 222 is provided with a first docking surface 2221, and the second docking protrusion 223 is provided with a second docking surface 2231. The first docking surface 2221 docks with the first groove wall 1321, and the second docking surface 2231 docks with the second groove wall 1331.

[0062] Because the first groove wall 1321 and the second groove wall 1331 on both sides of the first assembly groove 131 are coplanar with the axis of the assembly hole, the depth of the first assembly groove 131 is equal to the radius of the assembly hole. When the cover 200 is disassembled from the cylinder head 100, the assembly hole can be partially open, and the internal space of the first assembly groove 131 is not obstructed by the groove wall structure, so that the matching components set in the first assembly groove 131 can be directly taken out and installed, simplifying the disassembly and assembly operations of the matching components.

[0063] Furthermore, the first mating surface 2221 of the first assembly protrusion and the second mating surface 2231 of the second assembly protrusion respectively mate and fit against the first groove wall 1321 and the second groove wall 1331, which can achieve assembly positioning between the cover 200 and the cylinder head 100, ensure precise alignment between the first assembly groove 131 and the second assembly groove 221, and improve the roundness of the assembly hole. In addition, it can also disperse the clamping force generated between the cover 200 and the cylinder head 100 due to assembly.

[0064] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment, the first docking groove 132 further has a third groove wall 1322 connected to the first groove wall 1321. The side of the third groove wall 1322 away from the first groove wall 1321 is connected to the first docking portion 110. The plane of the third groove wall 1322 and the plane of the first groove wall 1321 form an obtuse angle. The second docking groove 133 further has a fourth groove wall 1332 connected to the second groove wall 1331. The side of the fourth groove wall 1332 away from the second groove wall 1331 is docked with the first docking portion 110. The plane of the fourth groove wall 1332 and the plane of the second groove wall 1331 form an obtuse angle.

[0065] The third groove wall 1322 and the fourth groove wall 1332 are arranged at obtuse angles to the first groove wall 1321 and the second groove wall 1331, respectively. This creates an open structure with gradually expanding groove openings, providing more operating space when disassembling and assembling components inside the cylinder head 100, thus facilitating component assembly and disassembly. Furthermore, the arrangement of the third groove wall 1322 and the fourth groove wall 1332 acts as a guide, allowing for insertion between the first mating protrusion 222 and the first mating groove 132, and between the second mating protrusion 223 and the second mating groove 133, without the need for precise alignment. This further simplifies the alignment and assembly operation between the cover 200 and the cylinder head 100.

[0066] Furthermore, since the third groove wall 1322 and the fourth groove wall 1332 are obtuse angles with the first groove wall 1321 and the second groove wall 1331 respectively, there will be no tool interference or cutting obstruction during the milling process of the obtuse angle structure, thus reducing the difficulty of milling.

[0067] Please see Figure 1 , Figure 2 and Figure 6 In one embodiment, the first docking protrusion 222 is provided with a third docking surface 2222, which is used to dock with the third groove wall 1322, and the second docking protrusion 223 is provided with a fourth docking surface 2232, which is used to dock with the fourth groove wall 1332.

[0068] The third mating surface 2222 and the fourth mating surface 2232 can fit against the third groove wall 1322 and the fourth groove wall 1332 respectively to form a sloping guide structure during assembly, further reducing the difficulty of alignment; after assembly, it can constrain the cover 200 and the cylinder head 100, effectively preventing the cover 200 from shifting or shaking, ensuring that the first assembly groove 131 and the second assembly groove 221 are accurately aligned, and improving the forming accuracy of the assembly hole.

[0069] Please see Figure 1 , Figure 2 , Figures 6 to 9 In one embodiment, the cylinder assembly further includes a sealing gasket 600, which includes a sealing protrusion 610, a first inclined portion 620, a first recess 630, an arched portion 640, a second recess 650, and a second inclined portion 660 connected end to end in sequence. The sealing protrusion 610 abuts between the first mating portion 110 and the second mating portion 210, the first inclined portion 620 abuts between the third mating surface 2222 and the third groove wall 1322, the first recess 630 abuts between the first mating surface 2221 and the first groove wall 1321, the arched portion 640 fits against the groove wall of the second assembly groove 221, the second recess 650 abuts between the second mating surface 2231 and the second groove wall 1331, and the second inclined portion 660 abuts between the fourth mating surface 2232 and the fourth groove wall 1332.

[0070] The sealing protrusion 610, the first inclined portion 620, the first recess 630, the arched portion 640, the second recess 650, and the second inclined portion 660 are connected end to end to form a sealing gasket 600. The sealing protrusion 610 seals the mating gap between the first mating portion 110 of the cylinder head 100 and the second mating portion 210 of the cover body 200. The first protrusion and the second recess 650 are respectively adapted to the straight first groove wall 1321 and the second groove wall 1331. The first inclined portion 620 and the second inclined portion 660 are respectively adapted to the inclined third groove wall 1322 and the fourth groove wall 1332. The arched portion 640 fits into the groove wall of the second mounting groove 221, thereby preventing oil leakage between the cylinder head 100 and the cover body 200. At the same time, it can prevent external mud, sand, dust and other particles from entering the mounting groove 120 and protect the components in the mounting groove 120.

[0071] Furthermore, the sealing protrusion 610, the first inclined portion 620, the first recess 630, the arched portion 640, the second recess 650, and the second inclined portion 660 are connected end to end to form an annular sealing gasket 600. The shape of the sealing gasket 600 can perfectly fit the mating surface between the cylinder head 100 and the cover 200, which not only avoids scratching damage to the sealing gasket 600 during the mating process between the cylinder head 100 and the cover 200, but also ensures sealing performance.

[0072] Furthermore, the first docking part 110 and the third groove wall 1322, the third groove wall 1322 and the first groove wall 1321, the second groove wall 1331 and the fourth groove wall 1332, and the fourth groove wall 1332 and the first docking part 110 are all connected by rounded surfaces to avoid sharp edges from cutting the sealing gasket 600.

[0073] Understandably, the arched portion 640 presses against the groove wall of the second assembly groove 221 and the external matching component to ensure the sealing performance at the assembly hole.

[0074] Please see Figures 7 to 9 In one embodiment, the sealing gasket 600 is further provided with a flange structure 670, which is disposed on one side of the sealing gasket 600 and the shape of the flange structure 670 corresponds to the shape of the sealing gasket 600. An annular insertion groove is provided at the edge of the cover 200, and the flange structure 670 is inserted into the insertion groove to achieve positioning between the sealing gasket 600 and the cover 200.

[0075] Further, please refer to Figures 7 to 9 The flange structure 670 is provided with a positioning protrusion 671, and the inner side wall of the insertion groove is provided with a positioning groove. The positioning protrusion 671 is inserted into the positioning groove to avoid relative sliding between the sealing gasket 600 and the cover 200.

[0076] Please see Figures 7 to 9 In one embodiment, the flange structure 670 is further provided with a pressing part 672, which protrudes from the flange structure 670 and is used to press into the insertion groove. The pressing force formed between the flange structure 670 and the groove wall of the insertion groove on the pressing part 672 improves the tightness between the sealing gasket 600 and the cover 200 after assembly.

[0077] In one embodiment, the external fitting component disposed within the mounting hole is a seat ring 700, which is annular to match the shape of the mounting hole.

[0078] Please see Figure 10 Furthermore, the outer contour of the seat ring 700 used for mounting at the mounting hole and the diameter of the mounting hole are larger than the maximum outer contour of the camshaft 500, so as to facilitate the mounting of the camshaft 500 from the mounting hole.

[0079] Please see Figure 2 and Figure 10 In one embodiment, the seat ring 700 is provided with timing marks 710 that are flush with the third groove wall 1322 and the fourth groove wall 1332 for timing calibration.

[0080] Another embodiment provides an engine that includes a cylinder assembly as described in any of the above embodiments.

[0081] In the aforementioned engine, the first mating portion 110 of the cylinder head 100 is assembled with the second mating portion 210 of the cover 200 so that the cover 200 covers the opening of the mounting groove 120 of the cylinder head 100, thereby protecting the valve joint 300 and the fuel injection mechanism 400 within the mounting groove 120. Since the fuel injection mechanism 400 and the valve joint 300 are both located within the mounting groove 120 of the cylinder head 100, the distance between them is shorter. Therefore, even though the high-viscosity oil injected by the fuel injection mechanism 400 has a shorter spray distance, the oil can still effectively act on the valve joint 300, thus achieving effective lubrication. Compared with conventional technology, in the aforementioned engine, even under cold start conditions, the oil injected by the fuel injection mechanism 400 can still effectively reach the valve joint 300, reducing wear on the valve joint 300 and improving engine durability.

[0082] Another embodiment provides a motorcycle that includes an engine as described in the above embodiments.

[0083] In the aforementioned motorcycle, the first mating portion 110 of the cylinder head 100 is assembled with the second mating portion 210 of the cover 200 so that the cover 200 covers the opening of the mounting groove 120 of the cylinder head 100, thereby protecting the valve joint 300 and the fuel injection mechanism 400 within the mounting groove 120. Since the fuel injection mechanism 400 and the valve joint 300 are both located within the mounting groove 120 of the cylinder head 100, the distance between them is shorter. Therefore, even though the high-viscosity oil injected by the fuel injection mechanism 400 has a shorter spray distance, the oil can still effectively act on the valve joint 300, thus achieving effective lubrication. Compared with conventional technology, in the aforementioned motorcycle, even under cold engine start-up conditions, the oil injected by the fuel injection mechanism 400 can still effectively reach the valve joint 300, reducing wear on the valve joint 300 and improving engine durability.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A cylinder assembly, characterized in that, include: The cylinder head has an installation groove and a first docking part, the first docking part being located at the opening of the installation groove; The cover body is provided with a second docking part, which is assembled with the first docking part so that the cover body covers the opening of the mounting groove; A valve joint, wherein the valve joint is disposed in the cylinder head and located within the mounting groove; as well as The fuel injection mechanism is located in the cylinder head and within the mounting groove, and is used to inject fuel into the valve moving pair.

2. The cylinder assembly according to claim 1, characterized in that, The cylinder head has a third mating portion on one side along the length of the cylinder assembly, and the cover has a fourth mating portion on one side along the length of the cylinder assembly. The third mating portion and the fourth mating portion are assembled to form an assembly hole. The cylinder assembly also includes a camshaft, which is located on the cylinder head and drivenly connected to the valve moving pair. The axis of the camshaft coincides with the axis of the assembly hole. The distance between the axis of the assembly hole and the bottom wall of the mounting groove is less than the distance between the first mating portion and the bottom wall of the mounting groove.

3. The cylinder assembly according to claim 2, characterized in that, The third docking part has a first assembly groove, and the fourth docking part has a second assembly groove. The groove opening of the first assembly groove and the groove opening of the second assembly groove are connected to form the assembly hole.

4. The cylinder assembly according to claim 3, characterized in that, The third docking portion is further provided with a first docking groove and a second docking groove. The first docking groove is located on one side of the third docking portion along the width direction of the cylinder assembly, and the second docking groove is located on the other side of the third docking portion along the width direction. The fourth docking portion is provided with a first docking protrusion and a second docking protrusion. The first docking protrusion is located on one side of the fourth docking portion along the width direction, and the second docking protrusion is located on the other side of the fourth docking portion along the width direction. The first docking protrusion is inserted into the first docking groove, and the second docking protrusion is inserted into the second docking groove.

5. The cylinder assembly according to claim 4, characterized in that, The first docking groove has a first groove wall connected to the groove wall of the first assembly groove, and the second docking groove has a second groove wall connected to the groove wall of the first assembly groove. The plane where the first groove wall is located, the plane where the second groove wall is located, and the axis of the assembly hole are coplanar. The first docking protrusion has a first docking surface, and the second docking protrusion has a second docking surface. The first docking surface docks with the first groove wall, and the second docking surface docks with the second groove wall.

6. The cylinder assembly according to claim 5, characterized in that, The first docking groove also has a third groove wall connected to the first groove wall. The side of the third groove wall away from the first groove wall is connected to the first docking portion. The plane of the third groove wall is at an obtuse angle to the plane of the first groove wall. The second docking groove also has a fourth groove wall connected to the second groove wall. The side of the fourth groove wall away from the second groove wall is docked to the first docking portion. The plane of the fourth groove wall is at an obtuse angle to the plane of the second groove wall.

7. The cylinder assembly according to claim 6, characterized in that, The first docking protrusion has a third docking surface for docking with the third groove wall, and the second docking protrusion has a fourth docking surface for docking with the fourth groove wall.

8. The cylinder assembly according to claim 7, characterized in that, The cylinder assembly also includes a sealing gasket, which comprises a sealing protrusion, a first inclined portion, a first recess, an arched portion, a second recess, and a second inclined portion connected end to end in sequence. The sealing protrusion abuts against the first mating portion and the second mating portion, the first inclined portion abuts against the third mating surface and the third groove wall, the first recess abuts against the first mating surface and the first groove wall, the arched portion fits against the groove wall of the second assembly groove, the second recess abuts against the second mating surface and the second groove wall, and the second inclined portion abuts against the fourth mating surface and the fourth groove wall.

9. An engine, characterized in that, The engine includes a cylinder assembly as described in any one of claims 1-8.

10. A motorcycle, characterized in that, The motorcycle includes the engine as described in claim 9.

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