Water-cooled engine and motorcycle

Abstract

The application relates to a water-cooled engine and a motorcycle. The water-cooled engine comprises a crankcase, a crankcase cover, a water pump and a cylinder body. The crankcase cover is arranged on the crankcase, the crankcase cover is provided with a water passing pipeline and a first port, and the water passing pipeline is connected with the first port. The water pump is arranged in the interior of the crankcase cover, the water passing pipeline gradually extends from the first port along the interior of the crankcase cover and is communicated to the water pump in the direction away from the first port, and the water pump is used for driving the cooling medium to flow; the cylinder body is arranged on the crankcase, the cylinder body is provided with a second port, the first port is communicated with the second port when the cylinder body is arranged on the crankcase, and the water pump is used for pumping the cooling medium into the cylinder body through the water passing pipeline. The water passing pipeline is arranged in the interior of the crankcase cover, the first port is communicated with the second port in a butt joint mode, the water pump is communicated with the cylinder body, the exposed pipeline is reduced, the risk of collision and aging is reduced, surrounding components need not to be avoided, bending is reduced, flow resistance is reduced, and reliability is improved.

Description

Technical Field

[0001] This application relates to the field of motorcycle technology, and in particular to a water-cooled engine and a motorcycle. Background Technology

[0002] With the development of motorcycle engine technology, engines generate a large amount of heat during operation. To ensure stable operation within a suitable temperature range, a corresponding cooling system is usually required to dissipate heat. Currently, motorcycle engines commonly employ air cooling, oil cooling, or water cooling methods. Among these, water cooling utilizes cooling water circuits to circulate the cooling medium within the engine and related cooling components, carrying away the heat generated during engine operation and thus regulating the engine's operating temperature.

[0003] In related technologies, water-cooled engines typically require the installation of corresponding cooling water circuits based on the cooling needs of each engine component to facilitate the flow of cooling medium between different components. Due to the complex internal structure of the engine and the interconnections between multiple components such as the cylinder block, crankcase, and water pump, the cooling water circuits need to be arranged in conjunction with the overall engine structure to meet the requirements of cooling medium circulation.

[0004] However, the existing cooling water circuit structure of water-cooled engines still suffers from insufficient reliability in practical applications, making them susceptible to damage from external factors and thus affecting the normal operation of the cooling system. Therefore, it is necessary to optimize the cooling water circuit layout of motorcycle water-cooled engines to improve the reliability of the cooling system. Summary of the Invention

[0005] Based on this, the application provides a water-cooled engine and a motorcycle, aiming to improve the structural reliability of the water-cooled engine's water pipes.

[0006] In one aspect, this application provides a water-cooled engine, the water-cooled engine comprising:

[0007] Crankcase;

[0008] A crankcase cover, wherein the crankcase cover is disposed on the crankcase, the crankcase cover having a water inlet pipe and a first port, the water inlet pipe being connected to the first port;

[0009] A water pump is located inside the crankcase cover. In a direction away from the first port, the water pipe extends gradually from the first port along the inside of the crankcase cover and connects to the water pump. The water pump is used to drive the flow of cooling medium.

[0010] A cylinder block is provided for mounting in the crankcase. The cylinder block has a second port. When the cylinder block is mounted in the crankcase, the first port and the second port are connected. The water pump is used to pump the cooling medium into the cylinder block via the water pipe.

[0011] In one embodiment, the water pipe is integrally cast inside the crankcase cover, and the water pipe extends in a straight line between the water pump and the first port, so that the water pump is connected to the first port.

[0012] In one embodiment, the diameter of the water passage is uniformly distributed; or, the diameter of the water passage gradually increases in the direction away from the water pump along the axial direction of the water passage.

[0013] In one embodiment, the water pump includes a pump body and a pump cover, the pump body being integrally formed on the crankcase cover, and the pump cover being connected to the pump body and enclosing it to form a water pressure chamber;

[0014] The outer contour of the pump body is provided with a first edge portion, and the first edge portion has a third port. The outer contour of the pump cover is provided with a second edge portion, and the second edge portion has a fourth port.

[0015] The end of the water pipe away from the first port is connected to the third port. When the first edge portion is attached to the second edge portion, the third port and the fourth port are connected, and the fourth port is connected to the pressure chamber.

[0016] In one embodiment, the opening width of the third port is greater than or equal to the opening width of the fourth port, and the projection of the fourth port onto the first edging portion is located inside the contour of the third port.

[0017] In one embodiment, the third port and the fourth port are arranged concentrically on the mating surfaces of the first edge portion and the second edge portion.

[0018] In one embodiment, the water pump further includes a first sealing ring and a second sealing ring, which are disposed between the first edge portion and the second edge portion, and both the first sealing ring and the second sealing ring surround the outer periphery of the water pressure chamber. The first sealing ring is located on the side closer to the water pressure chamber, and the second sealing ring is located on the side farther from the water pressure chamber.

[0019] In one embodiment, the water pump further includes a third sealing ring disposed between the first edge portion and the second edge portion. The projection of the third sealing ring on the first edge portion surrounds the outer periphery of the third port, and the third sealing ring is located within the gap between the first sealing ring and the second sealing ring.

[0020] In one embodiment, the water-cooled engine further includes a connecting water pipe, one end of which is connected to the first port, and the other end of which is connected to the second port, and the length of the water passage is 5 to 6 times the length of the connecting water pipe.

[0021] On the other hand, this application also provides a motorcycle, including a water-cooled engine as described in any of the preceding claims, a frame body, and a protective plate. The water-cooled engine and the protective plate are disposed on the frame body. The cylinder block includes a cooling water jacket and a water inlet pipe. One end of the water inlet pipe is connected to the cooling water jacket, and the other end is connected to the second port. The protective plate covers the outside of the water inlet pipe. The water-cooled engine and motorcycle of this application have the following advantages compared to related technologies:

[0022] The water-cooled engine provided in this application, by setting the water pipe inside the crankcase cover and connecting the first and second ports when the crankcase cover is installed in the crankcase, allows the water pump and cylinder block to be connected via the water pipe and the first and second ports. This eliminates the need for additional exposed pipes between the crankcase cover and the cylinder block, simplifying the overall engine structure, reducing the number of parts and assembly steps, and avoiding the risk of damage from external exposure to the external environment. This improves the structural reliability of the water pipe and extends its service life. Furthermore, since the water pipe is located inside the crankcase cover, it does not require additional space outside the engine and does not need to bend around the chassis, exhaust system, or other surrounding components, avoiding pipe bends and increased paths caused by such avoidance. This allows the cooling medium to flow smoothly between the water pump and cylinder block with a shorter path and less resistance, effectively reducing the flow resistance of the cooling medium and improving the operational stability of the cooling system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the water-cooled engine provided in this application.

[0024] Figure 2 This is a schematic diagram of the structure of the water-cooled engine after the cylinder block has been removed, as provided in this application.

[0025] Figure 3 This is a schematic diagram of the structure of the water-cooled engine after disassembling the cylinder block and pump cover, as provided in this application.

[0026] Figure 4 This is a schematic diagram of the pump cover in the water-cooled engine provided in this application.

[0027] Figure 5 This is a structural schematic diagram of the water-cooled engine and protective plate in the motorcycle provided in this application.

[0028] In the diagram, 1 is the water-cooled engine; 10 is the crankcase; 20 is the crankcase cover; 21 is the water pipe; 22 is the first port; 30 is the cylinder block; 31 is the second port; 32 is the water inlet pipe; 40 is the water pump; 41 is the pump body; 411 is the first edging part; 412 is the third port; 42 is the pump cover; 421 is the second edging part; 422 is the fourth port; 43 is the first sealing ring; 44 is the second sealing ring; 45 is the third sealing ring; 40a is the water pressure chamber; 50 is the connecting water pipe; and 2 is the protective plate. Detailed Implementation

[0029] 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.

[0030] In the description of this application, it should be understood that if terms such as "center", "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] For ease of explanation later, the following explanation is provided first: See [link / reference] Figure 1 As shown, for a water-cooled engine 1 suitable for motorcycles, the crankcase 10, crankcase cover 20, and cylinder block 30 are all important components of the water-cooled engine 1. The crankcase cover 20 is located on one side of the crankcase 10 and is used to seal the internal chamber of the crankcase 10; the cylinder block 30 is located on the crankcase 10 and extends along its height, accommodating the piston and forming part of the combustion chamber. Due to the spatial difference between the crankcase cover 20 and the cylinder block 30, the delivery pipeline connecting the water pump 40 and the water-cooling inlet of the cylinder block 30 usually needs to be arranged outside the engine. In related technologies, the delivery pipeline is usually arranged outside the engine using independent pipeline elements (such as rubber hoses or metal bends). However, the space around a motorcycle engine is compact, and the frame, exhaust system, and other functional components are also arranged externally, causing the external delivery pipeline to need to make multiple bends and path extensions during the arrangement process, thereby increasing the flow resistance of the cooling medium. Meanwhile, exposed pipelines are also susceptible to external factors such as high temperatures and collisions with foreign objects, posing risks of aging, damage, and leakage.

[0035] See Figure 1 and Figure 2 One embodiment of this application provides a water-cooled engine, which includes a crankcase 10, a crankcase cover 20, a water pump 40, and a cylinder block 30.

[0036] A crankcase cover 20 is disposed on a crankcase 10. The crankcase cover 20 has a water inlet pipe 21 and a first port 22, with the water inlet pipe 21 connected to the first port 22. A water pump 40 is disposed inside the crankcase cover 20. In the direction away from the first port 22, the water inlet pipe 21 gradually extends from the first port 22 along the interior of the crankcase cover 20 and connects to the water pump 40. The water pump 40 is used to drive the flow of cooling medium. A cylinder block 30 is disposed on the crankcase 10. The cylinder block 30 has a second port 31. When the cylinder block 30 is disposed on the crankcase 10, the first port 22 and the second port 31 are connected. The water pump 40 is used to pump the cooling medium into the cylinder block 30 via the water inlet pipe 21.

[0037] The water-cooled engine 1 provided in this application, by setting the water pipe 21 inside the crankcase cover 20 and connecting the first port 22 and the second port 31 of the crankcase cover 20 when it is set in the crankcase 10, allows the water pump 40 and the cylinder block 30 to form a water circuit through the water pipe 21 and the first port 22 and the second port 31. This eliminates the need for an additional exposed pipe between the crankcase cover 20 and the cylinder block 30, simplifying the overall engine structure, reducing the number of parts and assembly steps, and preventing the water pipe 21 from being externally located on the engine, thus avoiding… To mitigate the risk of damage from exposure to the external environment, the structural reliability of the water pipe 21 is improved, which helps extend its service life. At the same time, since the water pipe 21 is located inside the crankcase cover 20, it does not require additional space outside the engine, nor does it need to avoid surrounding components such as the chassis and exhaust system. This avoids pipe bends and increased paths caused by avoidance, allowing the cooling medium to flow smoothly between the water pump 40 and the cylinder block 30 with a shorter path and less resistance. This effectively reduces the flow resistance of the cooling medium and improves the operational stability of the cooling system.

[0038] It should be understood that the "water passage 21 gradually extends from the first port 22 along the interior of the crankcase cover 20 and connects to the water pump 40" mentioned in this application refers to the formation of a water passage for the cooling medium to flow inside the solid structure of the crankcase cover 20. That is, the water passage 21 is a cavity structure formed in the solid material of the crankcase cover 20. One end of the water passage 21 is connected to the first port 22 and the other end is connected to the water pump 40, so that the water passage 21 and the crankcase cover 20 form an integral structure, rather than embedding an independent external pipe inside the crankcase cover 20. With the above configuration, when the crankcase cover 20 is installed on the crankcase 10, the first port 22 is connected to the second port 31 of the cylinder block 30. This allows the water pump 40 to form a water circuit with the cylinder block 30 via the water pipe 21, the first port 22, and the second port 31. There is no need to install an additional exposed pipe between the crankcase cover 20 and the cylinder block 30, which simplifies the overall structure and assembly process of the engine. At the same time, after the water pipe 21 is opened inside the crankcase cover 20, the pipe wall of the water pipe 21 is made of the solid material of the crankcase cover 20, so that the water pipe 21 is no longer exposed to the external environment. This effectively avoids the risk of damage caused by collisions with foreign objects and high-temperature aging, improves the structural reliability of the water pipe 21, and helps to extend the service life of the water pipe 21.

[0039] The water passage 21 can be formed inside the crankcase cover 20 in several ways, including but not limited to: during the casting process of the crankcase cover 20, by pre-setting a core or core-pulling structure, directly forming the water passage 21 inside the solid material of the crankcase cover 20; or, after the crankcase cover 20 is formed, drilling holes from the surface of the crankcase cover 20 inwards by machining to form the water passage 21, and sealing the holes to form a closed water passage channel; or, using additive manufacturing to integrally print the crankcase cover 20 with the water passage 21. The walls of the water passage 21 formed by any of the above methods are all made of the solid material of the crankcase cover 20, thus forming an integral structure between the water passage 21 and the crankcase cover 20. It is understood that the above-listed forming methods are merely illustrative, and this application does not limit the specific forming method of the water passage 21, as long as the water passage 21 can be formed inside the solid structure of the crankcase cover 20.

[0040] It should be noted that in related technologies, the crankcase cover 20 and the cylinder block 30 are respectively located at different positions in the crankcase 10, resulting in a certain distance and spatial position deviation between the arrangement position of the water pump 40 on the crankcase cover 20 and the arrangement position of the second port 31 of the cylinder block 30 on the cylinder block 30. If an external pipeline is used to connect the water pump 40 and the second port 31, the external pipeline will inevitably need to avoid surrounding components during its extension, causing the pipeline to bend or even climb, thereby increasing the flow resistance of the cooling medium. In this application, the water pipe 21 is installed inside the crankcase cover 20. The crankcase cover 20 is connected to the second port 31 via the first port 22. This allows the water pump 40 to form a water circuit with the cylinder block 30 via the water pipe 21, the first port 22, and the second port 31, eliminating the need for external pipes. This avoids the bends and climbs caused by external pipes, allowing the cooling medium to flow smoothly with a shorter path and less resistance, effectively reducing the flow resistance of the cooling medium. It is understood that the above description of positional deviation is merely an example for illustrative purposes and does not constitute any limitation on the scope or spatial orientation of this application.

[0041] See Figure 2 In one optional embodiment of this application, the water pipe 21 is integrally cast inside the crankcase cover 20, and the water pipe 21 extends in a straight line between the water pump 40 and the first port 22 so that the water pump 40 and the first port 22 are connected.

[0042] Specifically, by integrally casting the water pipe 21 inside the crankcase cover 20, the water pipe 21 and the crankcase cover 20 form an integrated structure. The wall of the water pipe 21 is directly formed by the crankcase cover 20 body, eliminating the need for separate external water pipes, connecting joints, and corresponding sealing structures. This reduces the number of connection points in the cooling water circuit, helping to reduce the risk of leakage and improve connection reliability. Simultaneously, the positional relationship of the water pipe 21 is determined during the crankcase cover 20 forming process, avoiding relative displacement of the external water pipe due to assembly errors, connection deviations, or long-term vibration. This ensures a stable connection between the water pump 40, the water pipe 21, and the first port 22, which is beneficial for maintaining the sealing state of the cooling water circuit and the stability of fluid delivery.

[0043] Meanwhile, by making the water pipe 21 extend straight between the water pump 40 and the first port 22, the water pipe 21 forms a continuous straight flow channel from the water pump 40 to the first port 22, reducing local disturbances and energy losses caused by flow channel turning during the transportation of the cooling medium, allowing the cooling medium to be directly transported to the first port 22 in a predetermined direction. Since the water pipe 21 is integrally arranged inside the crankcase cover 20, and the flow channel direction is determined during casting, the situation of adding bends or extending the path to avoid external components such as the chassis and exhaust system, as in traditional external water pipes, is avoided, thus enabling the cooling medium to maintain a smoother and more stable flow state between the water pump 40 and the first port 22.

[0044] See Figure 2 In one optional embodiment of this application, the diameter of the water pipe 21 is uniformly distributed; or, the diameter of the water pipe 21 gradually increases in the direction away from the water pump 40 along the axial direction of the water pipe 21.

[0045] In one embodiment, the diameter of the water-passing pipe 21 is uniformly distributed along the axial direction, forming a conveying channel with a consistent cross-sectional size. Since the cross-sectional area of ​​the channel remains constant throughout the entire flow path of the cooling medium, the cooling medium does not need to frequently adjust its flow velocity due to changes in cross-sectional area during transport. This effectively avoids sudden changes in flow velocity and flow field disturbances caused by local expansion or contraction of the diameter, thereby reducing the generation of turbulence and eddies. Simultaneously, the uniform diameter of the water-passing pipe 21 ensures that the flow state of the cooling medium at various locations within the pipe 21 is consistent, which helps maintain a relatively stable flow velocity distribution and pressure gradient. This allows the cooling medium to be continuously and smoothly conveyed by the water pump 40 to the first port 22, thereby improving the continuity and stability of the cooling medium transport process.

[0046] In another embodiment, the diameter of the water pipe 21 gradually increases along the axial direction away from the water pump 40. As the cooling medium continues to be transported forward along the water pipe 21, the cross-sectional area of ​​the flow channel gradually expands along the flow direction, causing the flow velocity of the cooling medium to gradually decrease. At the same time, the increase in the flow cross-sectional area effectively reduces the frictional resistance between the cooling medium and the pipe wall, reducing the pressure loss of the cooling medium during long-distance transportation. Especially when there is a positional deviation between the water pump 40 and the first port 22 in the height direction of the crankcase cover 20, causing the water pipe 21 to extend in an inclined or vertical state relative to the horizontal plane, the gradually expanding structure of the water pipe 21 can ensure that the cooling medium maintains a relatively sufficient pressure and stable flow rate at the end of the transportation process, avoiding excessive attenuation of flow velocity and increased pressure loss due to increased height or extended path. Therefore, it is suitable for cooling medium transportation scenarios where there is a height deviation between the water pump 40 and the first port 22, requiring the water pipe 21 to extend in an inclined or vertical manner.

[0047] It should be noted that in practical applications, different models of water-cooled engines 1 can adopt different layouts according to the overall vehicle structure and installation space requirements. The positional relationship between the water pump 40 and the first port 22 can also be changed accordingly. The water pipe 21 can be arranged in a horizontal, inclined, or along the structural direction of the crankcase cover 20, depending on the actual layout requirements. The situation where there is a positional deviation between the water pump 40 and the first port 22, requiring the water pipe 21 to be inclined or vertically extended, is merely an exemplary arrangement and not a prerequisite or necessary feature of this application. As long as the cooling medium can be connected between the water pump 40 and the first port 22 through the water pipe 21 located inside the crankcase cover 20, and the cooling medium circulation requirements are met, the technical solution of this application can be adopted regardless of whether the water pipe 21 is horizontal, inclined, or extends along the structural direction inside the crankcase cover 20.

[0048] See Figure 3 and Figure 4 In one optional embodiment of this application, the water pump 40 includes a pump body 41 and a pump cover 42. The pump body 41 is integrally formed on the crankcase cover 20. The pump cover 42 is connected to the pump body 41 and surrounds it to form a water pressure chamber 40a. The outer contour of the pump body 41 is provided with a first edge portion 411, and the first edge portion 411 has a third port 412. The outer contour of the pump cover 42 is provided with a second edge portion 421, and the second edge portion 421 has a fourth port 422. The end of the water pipe 21 away from the first port 22 is connected to the third port 412. When the first edge portion 411 and the second edge portion 421 are fitted together, the third port 412 and the fourth port 422 are connected, and the fourth port 422 is connected to the water pressure chamber 40a.

[0049] Specifically, by extending the outer contours of the pump body 41 and the pump cover 42 outwards, a first edging portion 411 is formed on the pump body 41, protruding outwards from the outside of the water pressure chamber 40a, and a second edging portion 421 is formed on the pump cover 42, protruding outwards from the outside of the water pressure chamber 40a. When the pump body 41 and the pump cover 42 are connected, the first edging portion 411 and the second edging portion 421 are fitted together and form a connection structure located around the water pressure chamber 40a. In some embodiments, the first edging portion 411 and the second edging portion 421 can be fixedly connected by threaded connection, bolt connection, snap-fit, welding, bonding, etc., or other connection methods that can achieve a fixed connection between the first edging portion 411 and the second edging portion 421 can be used. The above connection methods are only illustrative examples and do not constitute a limitation of this application. Those skilled in the art can choose according to actual needs, and this application does not limit them.

[0050] After the first edge portion 411 and the second edge portion 421 are fitted together, they together form an annular connection area around the water pressure chamber 40a. Since the connection area is continuously arranged along the periphery of the water pressure chamber 40a, the contact area between the pump body 41 and the pump cover 42 can be increased, resulting in a more stable connection between the pump body 41 and the pump cover 42. At the same time, the continuously arranged connection area also constitutes a sealing interface around the water pressure chamber 40a, giving the periphery of the water pressure chamber 40a a continuous sealing path, which helps to reduce the possibility of cooling medium leakage from the connection point between the pump body 41 and the pump cover 42.

[0051] Furthermore, the first edging portion 411 and the second edging portion 421 also serve to achieve internal communication between the pressure chamber 40a and the water passage 21. The end of the water passage 21 away from the first port 22 extends to the first edging portion 411 and communicates with the third port 412. The fourth port 422 opened in the second edging portion 421 communicates with the pressure chamber 40a. When the first edging portion 411 and the second edging portion 421 are fitted together, the third port 412 and the fourth port 422 are directly connected, so that the pressure chamber 40a and the water passage 21 form an internal flow path at the connection position between the pump body 41 and the pump cover 42, thereby avoiding the use of an external connecting pipe to achieve communication between the pump 40 and the water passage 21.

[0052] It should be understood that the phrase "pump body 41 integrally formed into crankcase cover 20" in this application refers to the integrated arrangement of pump body 41 and crankcase cover 20, meaning that the pump body 41 for mounting the impeller is directly formed from the crankcase cover 20 body. With this arrangement, the water passage 21 formed inside the crankcase cover 20 can directly extend to the first edging portion 411 on the outside of the pump body 41 and communicate with the third port 412 opened in the first edging portion 411, reducing the need for external piping between the pressure chamber 40a and the water passage 21, and lowering the complexity of the external arrangement of the cooling water circuit.

[0053] See Figure 3 and Figure 4 In an optional embodiment of this application, the opening width of the third port 412 is greater than or equal to the opening width of the fourth port 422, and the projection of the fourth port 422 onto the first edging portion 411 is located inside the outline of the third port 412.

[0054] Specifically, when the first edge portion 411 and the second edge portion 421 are fitted together, the fourth port 422 and the third port 412 are connected to each other, forming a continuous flow channel between the pressure chamber 40a and the water pipe 21. Since the opening width of the third port 412 is greater than or equal to the opening width of the fourth port 422, when the cooling medium is pumped out from the pressure chamber 40a and flows into the third port 412 through the fourth port 422, the third port 412 will not restrict the fourth port 422, so that the cooling medium maintains a continuous flow cross section when transitioning between the two ports, reducing the local flow loss caused by the sudden change in the cross-sectional area of ​​the flow channel, and allowing the cooling medium to smoothly enter the water pipe 21 from the pressure chamber 40a.

[0055] Meanwhile, by positioning the projection of the fourth port 422 onto the first edge portion 411 within the contour of the third port 412, the third port 412 can provide a corresponding flow guiding area for the fourth port 422. When the pump body 41 is assembled with the pump cover 42, even with certain machining tolerances or assembly deviations, the fourth port 422 can still maintain effective communication with the third port 412, preventing the two ports from blocking part of the flow cross section due to edge misalignment, thus maintaining a continuous fluid conduction path between the pressure chamber 40a and the water pipe 21.

[0056] It should be noted that the opening widths of the third port 412 and the fourth port 422 in this application refer to the maximum dimensions measured along the edges of the corresponding ports, used to characterize the flow port sizes of the corresponding third port 412 and fourth port 422, and do not limit the specific shapes of the third port 412 and fourth port 422. That is, the third port 412 and fourth port 422 can be circular holes, elliptical holes, oblong holes, polygonal holes, or other port structures that enable the flow of cooling medium; this application does not impose any limitations on this.

[0057] See Figure 3 and Figure 4 In one optional embodiment of this application, on the mating surfaces of the first edge portion 411 and the second edge portion 421, the third port 412 and the fourth port 422 are arranged concentrically.

[0058] Specifically, the center of the third port 412 and the center of the fourth port 422 are aligned on the mating surfaces of the first edge portion 411 and the second edge portion 421. That is, when the first edge portion 411 and the second edge portion 421 are mated and connected, the center of the fourth port 422 corresponds to the center of the third port 412, and the fourth port 422 falls entirely within the port range of the third port 412, thereby forming an axially corresponding communication relationship between the third port 412 and the fourth port 422.

[0059] With this configuration, when the cooling medium flows from the pressure water chamber 40a through the fourth port 422 to the third port 412, the outflow direction of the fourth port 422 is consistent with the guiding direction of the third port 412. The cooling medium does not need to undergo a significant flow direction deflection at the contact surface between the first edge portion 411 and the second edge portion 421, and can directly enter the water pipe 21. This allows the cooling medium to achieve a smooth transition between the two ports, reducing local flow field disturbances caused by changes in flow direction.

[0060] Meanwhile, since the third port 412 and the fourth port 422 are arranged concentrically along the center of the port, the third port 412 and the fourth port 422 form an axially continuous flow channel after being fitted together. This allows the cooling medium to flow out of the pressure water chamber 40a and enter the water pipe 21 along the preset flow direction. This avoids local misalignment of the flow cross section or sudden change in the flow direction caused by the eccentric arrangement of the two ports, thereby maintaining the continuity of the flow channel between the pressure water chamber 40a and the water pipe 21. This helps to reduce the local flow loss of the cooling medium at the connection position of the two ports and allows the cooling medium to enter the water pipe 21 more smoothly.

[0061] It should be understood that the concentric arrangement of the third port 412 and the fourth port 422 in this application refers to the fact that the centers of the ports of the third port 412 and the fourth port 422 correspond to each other at the contact connection position of the first edge portion 411 and the second edge portion 421. It does not limit the overall arrangement of the third port 412, the fourth port 422, and the flow channels formed by their extensions to remain coaxial. In other words, the third port 412 and the fourth port 422 can be configured as straight lines, broken lines, or other transitional structures according to actual arrangement needs, as long as the centers of the ports of the third port 412 and the fourth port 422 can maintain correspondence at the contact connection position to achieve communication of the cooling medium between the two ports. This application does not impose any limitations on this.

[0062] See Figure 3 and Figure 4 In an optional embodiment of this application, the water pump 40 further includes a first sealing ring 43 and a second sealing ring 44. The first sealing ring 43 and the second sealing ring 44 are disposed between the first edge portion 411 and the second edge portion 421. The first sealing ring 43 is located on the side closer to the water pressure chamber 40a, and the second sealing ring 44 is located on the side farther from the water pressure chamber 40a. The third port 412 and the fourth port 422 are located between the first sealing ring 43 and the second sealing ring 44.

[0063] Specifically, the first edge portion 411 and the second edge portion 421 form an annular fitting connection area around the periphery of the water pressure chamber 40a. A first sealing ring 43 and a second sealing ring 44 are disposed between the first edge portion 411 and the second edge portion 421, wherein the first sealing ring 43 is disposed closer to the water pressure chamber 40a, and the second sealing ring 44 is disposed further away from the water pressure chamber 40a. That is, the first sealing ring 43 and the second sealing ring 44 are arranged radially spaced along the water pressure chamber 40a, forming a double sealing structure around the periphery of the water pressure chamber 40a on the mating surface of the first edge portion 411 and the second edge portion 421. A third port 412 and a fourth port 422 are located between the first sealing ring 43 and the second sealing ring 44, such that the port connection position is sealed within the sealing area defined by the double sealing structure.

[0064] With this configuration, the first sealing ring 43 is located closer to the pressure chamber 40a, forming a first sealing interface around the pressure chamber 40a and sealing the cooling medium inside. The second sealing ring 44 is located farther from the pressure chamber 40a, forming a second sealing interface between the first sealing edge 411 and the second sealing edge 421. When the cooling medium seeps outward from the pressure chamber 40a, it is first blocked by the first sealing ring 43. Even if there is a small amount of leakage at the first sealing ring 43, the seeping cooling medium must continue to pass through the second sealing ring 44 located on the outside before it can leak outward. This forms a double sealing path arranged radially along the pressure chamber 40a, increasing the seepage path of the cooling medium and improving the sealing reliability of the pressure chamber 40a.

[0065] It should be understood that the first sealing ring 43 located on the side closer to the water pressure chamber 40a and the second sealing ring 44 located on the side farther from the water pressure chamber 40a in this application are only used to describe the arrangement relationship of the first sealing ring 43 and the second sealing ring 44 relative to the water pressure chamber 40a. The fact that the first sealing ring 43 is closer to the water pressure chamber 40a than the second sealing ring 44, and the second sealing ring 44 is farther from the water pressure chamber 40a than the first sealing ring 43, does not limit the specific distance between the first sealing ring 43, the second sealing ring 44, and the water pressure chamber 40a, nor does it limit the spacing between them. As long as the first sealing ring 43 is located between the second sealing ring 44 and the water pressure chamber 40a, forming a double sealing structure arranged sequentially inside and outside, it is acceptable.

[0066] Furthermore, since the first edge portion 411 and the second edge portion 421 extend around the outer circumference of the water pressure chamber 40a, and the first sealing ring 43 and the second sealing ring 44 are both arranged along the annular fitting and connecting area, the first edge portion 411 and the second edge portion 421 can provide continuous support and compression at various positions in the circumference of the sealing ring, so that the first sealing ring 43 and the second sealing ring 44 maintain a relatively uniform compression state in the circumference after compression, which helps to reduce the fluctuation of sealing performance caused by uneven local compression force and further improve the overall sealing stability of the periphery of the water pressure chamber 40a.

[0067] See Figure 3 and Figure 4 In an optional embodiment of this application, the water pump 40 further includes a third sealing ring 45, which is disposed between the first edge portion 411 and the second edge portion 421. The projection of the third sealing ring 45 around the outer periphery of the third port 412 is located on the first edge portion 411, and the third sealing ring 45 is located in the gap between the first sealing ring 43 and the second sealing ring 44.

[0068] Specifically, by providing a third sealing ring 45 in the gap between the first sealing ring 43 and the second sealing ring 44, the third sealing ring 45 forms an independent annular seal on the outer periphery of the third port 412, which can form a local sealing barrier around the mating position of the third port 412 and the fourth port 422.

[0069] Since the opening width of the third port 412 is greater than or equal to the opening width of the fourth port 422, and the projection of the fourth port 422 on the first edge portion 411 is located inside the outline of the third port 412, when the cooling medium flows from the pressure water chamber 40a into the third port 412 through the fourth port 422, the cross-sectional area of ​​the flow channel will not narrow, and the cooling medium can flow smoothly through the docking position of the two ports. Furthermore, by providing a third sealing ring 45 on the outer periphery of the third port 412, when the cooling medium flows through the docking position of the third port 412 and the fourth port 422, the third sealing ring 45 can form a circumferential seal on the connection gap between the two ports, preventing the cooling medium from leaking outwards from the mating surface of the first edge portion 411 and the second edge portion 421 when flowing through this docking position.

[0070] It should be understood that the third sealing ring 45 is arranged around the outer periphery of the mating port of the third port 412 and the fourth port 422, and the third sealing ring 45 is located between the first sealing ring 43 and the second sealing ring 44. It only forms a local annular seal at the mating position, rather than being arranged around the outer periphery of the water pressure chamber 40a. That is to say, the first sealing ring 43 and the second sealing ring 44 form a full circumferential seal around the water pressure chamber 40a, while the third sealing ring 45 is independently arranged at the mating position of the two ports, forming a local seal only around the mating position. The three differ in their arrangement and sealing range.

[0071] See Figure 1 and Figure 2 In one optional embodiment of this application, the water-cooled engine 1 further includes a connecting water pipe 50, one end of which is connected to the first port 22, and the other end of which is connected to the second port 31, and the length of the water passage 21 is 5 to 6 times the length of the connecting water pipe 50.

[0072] Specifically, one end of the connecting water pipe 50 is connected to the first port 22 of the crankcase cover 20, and the other end is connected to the second port 31 of the cylinder block 30, so that the cooling medium in the water passage 21 can enter the cylinder block 30 through the connecting water pipe 50. By setting the length of the water passage 21 to 5 to 6 times the length of the connecting water pipe 50, most of the flow path of the cooling medium is handled by the water passage 21 integrated inside the crankcase cover 20, while the connecting water pipe 50 exposed between the crankcase cover 20 and the cylinder block 30 only serves as a short-distance connecting transition section.

[0073] With this configuration, after the cooling medium is pumped out by the water pump 40, its main delivery path is the water pipe 21 inside the crankcase cover 20. The connection between the crankcase cover 20 and the cylinder block 30 is only completed via the connecting water pipe 50 at the joint. Since the water pipe 21 bears the main path for cooling medium delivery, the length of the connecting water pipe 50 is significantly shortened, greatly reducing the exposed area of ​​the external pipes. This lowers the risk of damage caused by external environmental factors and improves the structural reliability of the cooling water system. Simultaneously, the shorter connecting water pipe 50 can be arranged according to the relative position between the crankcase cover 20 and the cylinder block 30 without requiring extensive avoidance of surrounding components. This avoids the bending caused by long-distance exposed pipes, allowing the cooling medium to enter the cylinder block 30 through the water pipe 21 with a shorter connection distance and less flow resistance, thus improving the delivery efficiency of the cooling medium.

[0074] Understandably, the length of the water pipe 21 is 5 to 6 times the length of the connecting water pipe 50. This means the length of the water pipe 21 is significantly greater than the connecting water pipe 50, allowing the water pipe 21 to handle the majority of the cooling medium's flow path. The connecting water pipe 50 is only used to cross the assembly interface between the crankcase cover 20 and the cylinder block 30. If the length of the water pipe 21 is too small a multiple of the connecting water pipe 50 (e.g., less than 5 times), the proportion of the flow path handled by the water pipe 21 is insufficient, and the length of the connecting water pipe 50 increases accordingly, leading to a larger area of ​​pipes exposed outside the engine. This is detrimental to improving structural reliability and reducing flow resistance. If the multiple is too large (e.g., greater than 6 times), although the length of the connecting water pipe 50 can be further shortened, the extension path of the water pipe 21 will be too long, placing higher demands on the internal space of the crankcase cover 20 and the casting process, making it difficult to rationally arrange the water pipe 21 within a limited space. Therefore, setting the length of the water pipe 21 to 5 to 6 times the length of the connecting water pipe 50 can shorten the length of the exposed pipe and improve the structural reliability, while taking into account the rational use of the internal space of the crankcase cover 20 and the feasibility of the casting process.

[0075] See Figure 5 As shown, in another aspect, one embodiment of this application also provides a motorcycle, including a water-cooled engine 1 as described in any of the foregoing embodiments, a frame body (not shown in the figure), and a protective plate 2. The water-cooled engine 1 and the protective plate 2 are disposed on the frame body. The cylinder block 30 includes a cooling water jacket and a water inlet pipe 32. One end of the water inlet pipe 32 is connected to the cooling water jacket, and the other end is connected to a second port 31. The protective plate 2 covers the outside of the water inlet pipe 32.

[0076] Specifically, the motorcycle uses the aforementioned water-cooled engine 1. Since the water pipe 21 is located inside the crankcase cover 20, rather than exposed outside the engine, it effectively reduces the risk of the water pipe 21 being affected by flying stones, foreign object impacts, and heat radiation from high-temperature components during motorcycle operation, thus improving the reliability and durability of the cooling system under complex riding conditions. Because the water pipe 21 does not need to run around the frame, exhaust system, or other components outside the engine, its routing is more compact and smooth. The flow resistance of the cooling medium between the water pump 40 and the cylinder block 30 is reduced, and the effective head of the water pump 40 is fully utilized, thereby improving the circulation efficiency of the motorcycle's cooling system and the overall heat dissipation performance. Furthermore, the location of the water pipe 21 inside the crankcase cover 20 reduces the number of external engine pipes and interfaces, simplifying the space layout within the motorcycle's engine compartment and improving overall assembly efficiency and maintenance convenience.

[0077] Meanwhile, the protective plate 2 is disposed on the outside of the water-cooled engine 1 to provide shielding protection for at least some exposed components of the water-cooled engine 1. The water inlet pipe 32 is disposed on the cylinder block 30, with one end connected to the cooling water jacket and the other end connected to the second port 31. The protective plate 2 covers the outside of the water inlet pipe 32 to provide shielding protection. While protecting the external components of the engine and the water inlet pipe 32, the protective plate 2 does not affect the engine's own heat dissipation performance or the normal disassembly and maintenance of components. The protective plate 2 also effectively shields the exposed connecting water pipe 50 of the water-cooled engine 1, reducing the area of ​​the connecting water pipe 50 directly exposed to the external environment, thereby further reducing the risk of the pipes being struck by foreign objects and corroded by the external environment, and improving the overall protective performance of the cooling system.

[0078] The water inlet pipe 32 is located on the outside of the cylinder block 30. This is primarily because the cylinder block 30, as a core component of the engine, integrates multiple functional structures, including cylinder bores, oil passages, a cooling water jacket, and various assembly connections. Integrating the water inlet pipe 32 entirely into the cylinder block 30 would further increase its structural complexity, hindering casting and machining processes and potentially affecting the strength and sealing performance of the original cylinder block 30 structure. Therefore, placing the water inlet pipe 32 on the outside of the cylinder block 30 simplifies the casting and machining process, maintains the integrity of the cylinder block 30's structure, and facilitates independent inspection and replacement of the water inlet pipe 32. When the water inlet pipe 32 ages or becomes damaged, it is not necessary to replace the entire cylinder block 30, thus balancing manufacturing feasibility and maintenance convenience.

[0079] It is understood that the specific form of the protective plate 2 is not limited to being formed from an independent sheet metal stamping part or plastic injection molding part and fixedly connected to the frame body or the housing of the water-cooled engine 1; it can also be an existing protective component already configured on the motorcycle, utilizing its extension or adding a shielding area to achieve shielding and protection of the water-cooled engine 1, the connecting water pipe 50, and the water inlet pipe 32. That is, the protective plate 2 can be an independent protective plate specifically added for the water-cooled engine 1, or it can be an integrated protective structure integrally formed or integrally set with the motorcycle's original side guards, chassis guards, or engine underguards, as long as the protective plate 2 can shield at least some of the exposed parts of the water-cooled engine 1, the connecting water pipe 50, and the water inlet pipe 32 in its position. In addition, the protective plate 2 can be provided with several ventilation holes or heat dissipation slots to ensure that while achieving shielding and protection, it does not affect the airflow and heat dissipation effect around the water-cooled engine 1.

[0080] It should be noted that the cooling water jacket refers to a hollow, sandwich structure located inside the solid structure of the cylinder block 30. It surrounds the cylinder bore of the cylinder block 30 and is used to circulate the cooling medium (such as water or antifreeze). The cooling water jacket is integrally formed inside the solid material of the cylinder block 30 by pre-setting a core or core-pulling structure during the casting process. It is distributed in annular or spiral channels on the outer periphery of the cylinder bore and connected to the external cooling water circuit via the inlet pipe 32. This allows the cooling medium from the water pump 40 to enter the cooling water jacket through the inlet pipe 32 and flow along the periphery of the cylinder bore, cooling and dissipating heat from the cylinder block 30 and the cylinder bore wall. This dissipates heat generated during combustion and transfers it to the radiator for heat exchange, thereby achieving stable control of the engine operating temperature. The specific structural form and internal flow channel arrangement of the cooling water jacket can refer to conventional settings in related technologies, and this application will not elaborate further.

[0081] 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.

[0082] The embodiments described above are merely illustrative of 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 water-cooled engine, characterized in that, The water-cooled engine includes: Crankcase; A crankcase cover, wherein the crankcase cover is disposed on the crankcase, the crankcase cover having a water inlet pipe and a first port, the water inlet pipe being connected to the first port; A water pump is located inside the crankcase cover. In a direction away from the first port, the water pipe extends gradually from the first port along the inside of the crankcase cover and connects to the water pump. A cylinder block is provided for mounting in the crankcase. The cylinder block has a second port. When the cylinder block is mounted in the crankcase, the first port and the second port are connected. The water pump is used to pump the cooling medium into the cylinder block via the water pipe.

2. The water-cooled engine according to claim 1, characterized in that, The water pipe is integrally cast inside the crankcase cover, and the water pipe extends in a straight line between the water pump and the first port, so that the water pump is connected to the first port.

3. The water-cooled engine according to claim 2, characterized in that, The diameter of the water passage is uniformly distributed; or, the diameter of the water passage gradually increases in the direction away from the water pump along the axial direction of the water passage.

4. The water-cooled engine according to any one of claims 1 to 3, characterized in that, The water pump includes a pump body and a pump cover. The pump body is integrally formed on the crankcase cover, and the pump cover is connected to the pump body and encloses it to form a water pressure chamber. The outer contour of the pump body is provided with a first edge portion, and the first edge portion has a third port. The outer contour of the pump cover is provided with a second edge portion, and the second edge portion has a fourth port. The end of the water pipe away from the first port is connected to the third port. When the first edge portion is attached to the second edge portion, the third port and the fourth port are connected, and the fourth port is connected to the pressure chamber.

5. The water-cooled engine according to claim 4, characterized in that, The opening width of the third port is greater than or equal to the opening width of the fourth port, and the projection of the fourth port onto the first edging portion is located inside the outline of the third port.

6. The water-cooled engine according to claim 5, characterized in that, On the mating surfaces of the first and second edge portions, the third and fourth ports are arranged concentrically.

7. The water-cooled engine according to claim 6, characterized in that, The water pump also includes a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring are disposed between the first edge portion and the second edge portion, and both the first sealing ring and the second sealing ring surround the outer periphery of the water pressure chamber. The first sealing ring is located on the side closer to the water pressure chamber, and the second sealing ring is located on the side farther from the water pressure chamber.

8. The water-cooled engine according to claim 7, characterized in that, The water pump also includes a third sealing ring, which is disposed between the first edge portion and the second edge portion. The projection of the third sealing ring on the first edge portion surrounds the outer periphery of the third port, and the third sealing ring is located in the gap between the first sealing ring and the second sealing ring.

9. The water-cooled engine according to claim 3, characterized in that, The water-cooled engine also includes a connecting water pipe, one end of which is connected to the first port and the other end of which is connected to the second port, and the length of the water passage is 5 to 6 times the length of the connecting water pipe.

10. A motorcycle, characterized in that, The motorcycle includes a water-cooled engine as described in any one of claims 1 to 9, a frame body and a protective plate, the water-cooled engine and the protective plate being disposed on the frame body, the cylinder block including a cooling water jacket and a water inlet pipe, one end of the water inlet pipe being connected to the cooling water jacket and the other end being connected to the second port, and the protective plate covering the outside of the water inlet pipe.

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