Water-cooled engine and motorcycle

Abstract

The embodiment of the present application provides a water-cooled engine and a motorcycle, and relates to the field of engines.The water-cooled engine comprises a cylinder body, a cylinder head, a radiator, a cooling water pump, an oil-water heat exchanger, a thermostatic valve assembly and a crankcase.Based on this, the water-cooled engine is arranged by reasonably utilizing the space thereof, and the positional relationship and the connection relationship among the various acting components are adjusted.On the one hand, the above arrangement shortens the water path distance and the length of the external pipeline through which the cooling medium flows, thereby reducing the pipeline flow resistance and improving the heat dissipation efficiency.On the other hand, the above device also reduces the bending of the water path pipeline, thereby reducing the assembly difficulty and the cooling medium leakage risk.In addition, the present application reduces the number of water pipes, improves the compactness of the engine, makes the appearance of the engine more simple, and effectively saves the technical effect of the occupied space of the whole vehicle.

Description

Technical Field

[0001] This invention relates to the field of engines, and more specifically, to a water-cooled engine and a motorcycle. Background Technology

[0002] To meet stricter emission regulations and control oil temperature, existing high-performance motorcycle engines require the addition of oil-water heat exchangers, especially four-cylinder high-revving engines. These often employ an external piping connection, linking the inlet of the oil-water heat exchanger to the engine's outlet, and vice versa. In a cold engine state, the engine's hot water flows through the oil-water heat exchanger, transferring heat to the oil flowing through it, achieving rapid warm-up. In a hot engine state, the coolant temperature is lower than the oil temperature, which helps reduce the oil temperature, keeping it within a reasonable range and protecting the engine.

[0003] The existing engine coolant inlet is located at the lower left side of the engine near the water pump, while the outlet is located at the rear of the cylinder head on the upper right side (engine intake side). The outlet is connected to the radiator inlet at the front of the engine via a water pipe. The distance between the engine inlet and outlet is too great, often requiring a long external water pipe to connect the inlet and outlet when installing an oil-water exchanger. This results in long piping distances, long connecting pipes, increased flow resistance, and reduced cooling efficiency. Furthermore, the oil-water exchanger can only be placed after the cylinders, preventing direct airflow and significantly reducing its cooling effect; if it were forcibly placed in front of the cylinders, the water pipe length would be further increased.

[0004] Alternatively, both the engine's inlet and outlet water ports are located at the front of the cylinder block (engine exhaust side). Coolant enters from the inlet at the front of the cylinder block, passes through the internal water jacket, reaches the outlet at the rear of the cylinder block, and then connects to the water pump via a water pipe. The water pump then pumps the coolant back through another water pipe connected to the cylinder head inlet. Coolant flows out from the exhaust side through the cylinder head, enters the outlet at the front of the cylinder block, and returns to the radiator. In this configuration, the engine's inlet and outlet water ports are located close together. Water enters the oil-water heat exchanger through an external water pipe from the engine outlet, and then returns to the engine inlet through the oil-water heat exchanger outlet and another water pipe. As a result, the inlet and outlet water pipes of the oil-water heat exchanger become very short and have large bends, leading to assembly difficulties, increased flow resistance, and too many external water pipes, making the front of the engine cluttered and unsightly. Excessive water pipes also increase the risk of leaks. Summary of the Invention

[0005] The purpose of this invention is to provide a novel, simple, aesthetically pleasing, and compact water-cooled engine that can reduce the distance between the water circuits of the oil-water exchanger and the length of the external pipeline by changing the connection method between the water circuits of the water-cooled engine, thereby reducing the flow resistance of the pipeline and improving the heat dissipation efficiency.

[0006] The purpose of this invention is to provide a novel, simple, beautiful, and compact motorcycle, which includes the aforementioned water-cooled engine. Therefore, by changing the connection method between the water circuits of the water-cooled engine, the distance between the oil-water exchanger water circuits and the length of the external pipes can be shortened, thereby reducing the flow resistance of the pipes and improving the heat dissipation efficiency.

[0007] The embodiments of the present invention can be implemented as follows:

[0008] In a first aspect, the present invention provides a water-cooled engine, comprising:

[0009] The cylinder block is equipped with a first cooling channel.

[0010] The cylinder head is equipped with a second cooling channel.

[0011] The water passage chamber is located at the joint surface between the cylinder head and the cylinder body.

[0012] The radiator is connected to the first cooling channel and can deliver the cooling medium stored inside the radiator to the first cooling channel.

[0013] The cooling water pump is connected to both the first cooling channel and the second cooling channel. The cooling water pump is used to pump the cooling medium flowing into the first cooling channel into the second cooling channel.

[0014] The oil-water heat exchanger has a water chamber that connects to the second cooling channel and the oil-water heat exchanger, and the oil-water heat exchanger is connected to the first cooling channel.

[0015] Thermostatic valve assembly, used to connect or disconnect the water passage chamber from the radiator;

[0016] Crankcase;

[0017] When the thermostatic valve assembly is closed, the first cooling channel, cooling water pump, second cooling channel, water passage chamber, oil-water heat exchanger, and first cooling channel sequentially form the first water circulation.

[0018] When the thermostat valve assembly is opened, the radiator, the first cooling channel, the cooling water pump, the second cooling channel, the water passage chamber, the thermostat valve assembly, and the radiator sequentially form the second water circulation.

[0019] In an optional embodiment, the cylinder block is provided with an engine water inlet and an engine water outlet on the exhaust side, wherein the engine water inlet is the opening at one end of the first cooling channel that connects to the radiator, and the engine water outlet is the opening at one end of the oil-water heat exchanger that connects to the water passage chamber.

[0020] In an optional embodiment, the water-cooled engine also includes an engine inlet and outlet water cover, with the engine outlet and engine inlet covered by the engine inlet and outlet water cover, and the thermostat valve assembly integrated on the engine inlet and outlet water cover.

[0021] In an optional embodiment, the thermostat valve assembly includes a thermostat valve seat, a thermostat valve body, and a thermostat valve cover. The mating surface between the cylinder block and the crankcase is the lower mating surface. The thermostat valve seat is arched downwards beyond the cylinder block and close to the crankcase. The thermostat valve body is disposed on the thermostat valve seat and is located at the engine coolant outlet. The thermostat valve cover is disposed on the thermostat valve seat and is connected to the thermostat valve body. The thermostat valve cover has a first interface communicating with the radiator.

[0022] In an optional embodiment, the radiator includes a radiator body, a radiator inlet pipe, and a radiator outlet pipe. The engine inlet / outlet cap is provided with a second interface that communicates with the engine inlet. One end of the radiator outlet pipe is connected to the second interface, and the other end of the radiator outlet pipe is connected to the radiator body. One end of the radiator inlet pipe is connected to the first interface, and the other end of the radiator inlet pipe is connected to the radiator body.

[0023] In an optional embodiment, both the engine water inlet and the engine water outlet are located in the cylinder block, and the opening at one end of the first cooling channel connected to the cooling water pump is the cylinder block water outlet; the opening at one end of the second cooling channel connected to the cooling water pump is the cylinder head water inlet; and the water passage chamber connects the second cooling channel and the engine water outlet.

[0024] In an optional embodiment, the engine water outlet is located at the middle position relative to the first cooling channel in the cylinder block, and the engine water inlet and the cylinder block water outlet are symmetrically located in the cylinder block relative to the center of the first cooling channel.

[0025] In an optional embodiment, the oil-water heat exchanger is mounted on the crankcase and has a cooling medium passage. One end of the oil-water heat exchanger inlet passage is connected to the engine outlet, and the other end of the oil-water heat exchanger inlet passage is connected to the cooling medium passage via the crankcase. One end of the oil-water heat exchanger outlet passage is connected to the engine inlet, and the other end of the oil-water heat exchanger outlet passage is connected to the cooling medium passage via the crankcase.

[0026] In an optional embodiment, the cooling water pump includes a water pump body, a water pump inlet pipe, and a water pump outlet pipe. The water pump inlet pipe connects the first cooling channel and the water pump body, and the water pump outlet pipe connects the water pump body and the second cooling channel. The water pump inlet pipe and the water pump outlet pipe are located on the air intake side of the cylinder block, and the water pump body is located on the side of the cylinder block.

[0027] Secondly, the present invention provides a motorcycle including a water-cooled engine according to any of the foregoing embodiments.

[0028] The beneficial effects of the embodiments of the present invention include:

[0029] In summary, embodiments of the present invention disclose a water-cooled engine, comprising a cylinder block, a cylinder head, a radiator, a water pump, an oil-water heat exchanger, a thermostat assembly, and a crankshaft chamber. When the thermostat assembly is closed, the first cooling channel, the water pump, the second cooling channel, the water passage chamber, the oil-water heat exchanger, and the first cooling channel sequentially form a first water circulation loop; when the thermostat assembly is open, the radiator, the first cooling channel, the water pump, the second cooling channel, the water passage chamber, the thermostat assembly, and the radiator sequentially form a second water circulation loop.

[0030] Through the above-described configuration, the water-cooled engine utilizes its space efficiently, adjusting the positional and connectivity relationships between its various components. On one hand, this configuration shortens the water path distance for cooling medium flow and the length of external pipes, thereby reducing pipe flow resistance and improving heat dissipation efficiency. On the other hand, the device also reduces bends in the water pipes, thus lowering assembly difficulty and the risk of cooling medium leakage. Furthermore, this invention reduces the number of water pipes, improving engine compactness and resulting in a simpler engine appearance, effectively saving space in the vehicle. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an overall schematic diagram of the water-cooled engine provided in Embodiment 1 of the present invention;

[0033] Figure 2 A partial cross-section of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 1 ;

[0034] Figure 3 This is a schematic diagram of the water-cooled engine's water passage chamber provided in Embodiment 1 of the present invention;

[0035] Figure 4 This is a cooling medium circulation diagram of a water-cooled engine provided in Embodiment 1 of the present invention;

[0036] Figure 5 This is a partial structural diagram of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 1 ;

[0037] Figure 6This is a perspective view of the integrated engine inlet / outlet water cover and thermostat valve assembly provided in Embodiment 1 of the present invention.

[0038] Figure 7 This is a second perspective view of the integrated diagram of the engine inlet / outlet water cover and thermostat valve assembly provided in Embodiment 1 of the present invention;

[0039] Figure 8 The flow diagram of the first and second cooling channels provided in Embodiment 1 of the present invention;

[0040] Figure 9 This is a partial structural diagram of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 2 ;

[0041] Figure 10 This is a partial structural diagram of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 3 ;

[0042] Figure 11 A partial cross-section of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 2 ;

[0043] Figure 12 This is a partial structural diagram of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 4 ;

[0044] Figure 13 This is a partial structural diagram of the water-cooled engine provided in Embodiment 1 of the present invention. Figure 5 .

[0045] Icons: 10-Water-cooled engine; 100-Cylinder block; 110-First cooling passage; 130-Engine water inlet; 150-Engine water outlet; 170-Cylinder block water outlet; 200-Cylinder head; 210-Second cooling passage; 230-Cylinder head water inlet; 250-Water passage chamber; 300-Thermostat assembly; 310-Thermostat body; 330-Thermostat cover; 331-First interface; 350-Thermostat seat; 400-Radiator; 410-Radiator outlet pipe; 430-Radiator inlet pipe; 450-Radiator body; 500-Cooling water pump; 510-Water pump inlet pipe; 530-Water pump outlet pipe; 55 0-Water pump body; 600-Oil-water heat exchanger; 610-Oil-water heat exchanger inlet channel; 611-First inlet channel; 613-Second inlet channel; 630-Oil-water heat exchanger outlet channel; 631-First outlet channel; 633-Second outlet channel; 650-Cooling medium channel; 670-Oil channel; 700-Engine inlet / outlet water cap; 710-Second interface; 800-Crankshaft housing; 810-Oil inlet channel; 811-Oil inlet; 830-Oil outlet channel; 831-Oil outlet; 850-Cooling medium inlet; 870-Cooling medium outlet; 900-Sealing gasket; 910-Water passage hole. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0050] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0051] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0052] Example 1

[0053] Please see Figures 1 to 3 ,in Figure 1 , Figure 2 The black arrows indicate the direction of cooling medium flow. This embodiment discloses a water-cooled engine 10, comprising a cylinder block 100, a cylinder head 200, a radiator 400, a cooling water pump 500, an oil-water heat exchanger 600, a thermostatic valve assembly 300, and a crankcase 800.

[0054] The cylinder block 100 is provided with a first cooling channel 110; the cylinder head 200 is provided with a second cooling channel 210; a water passage chamber 250 is provided at the joint surface between the cylinder head 200 and the cylinder block 100; the radiator 400 is connected to the first cooling channel 110 and can deliver the cooling medium stored inside the radiator 400 to the first cooling channel 110; both the first cooling channel 110 and the second cooling channel 210 are connected to a cooling water pump 500, which pumps the cooling medium flowing into the first cooling channel 110 into the second cooling channel 210; the water passage chamber 250 connects the second cooling channel 210 to the oil-water heat exchanger 600, and the oil-water heat exchanger 600 is connected to the first cooling channel 110; the thermostatic valve assembly 300 is used to connect or disconnect the water passage chamber 250 from the radiator 400.

[0055] When the thermostat valve assembly 300 is closed, the first cooling channel 110, the cooling water pump 500, the second cooling channel 210, the water passage chamber 250, the oil-water heat exchanger 600, and the first cooling channel 110 sequentially form a first water circulation. When the thermostat valve assembly 300 is open, the radiator 400, the first cooling channel 110, the cooling water pump 500, the second cooling channel 210, the water passage chamber 250, the thermostat valve assembly 300, and the radiator 400 sequentially form a second water circulation.

[0056] Through the above-described configuration, the present invention improves the connection method between cooling water channels in the water-cooled engine 10, significantly shortening the flow distance between the cylinder block 100 and the radiator 400. Based on this, the present application achieves the technical effect of reducing pipe flow resistance on the one hand, and effectively improves the heat dissipation efficiency of the water-cooled engine 10 on the other.

[0057] Please see Figure 4 Regardless of whether the thermostat valve assembly 300 is closed or open, the first water circulation is always open. This means that the flow of the first water circulation is not affected by the thermostat valve assembly 300; only the flow rate of the cooling medium is related to the opening and closing state of the thermostat valve assembly 300.

[0058] When the water-cooled engine 10 is in a cold state, that is, when the thermostat valve assembly 300 is closed, the water-cooled engine 10 only operates the first water circuit circulation. Because the temperature of the cooling medium is higher than the temperature of the engine oil in the water-cooled engine 10 when it passes through the oil-water heat exchanger 600 in the first water circuit circulation, heat exchange occurs between the cooling medium and the engine oil, causing the engine oil to heat up rapidly. In this way, the water-cooled engine 10 can achieve the beneficial effects of rapid warm-up and reduced emissions.

[0059] When the water-cooled engine 10 is in a warm-up state, the temperature of the engine oil is higher than that of the cooling medium. The high-temperature engine oil then exchanges heat with the cooling medium, causing the cooling medium temperature to rise. Furthermore, once the cooling medium reaches a preset temperature (e.g., 80°C), it acts on the thermostat valve assembly 300, causing it to open and allowing the second water circulation circuit to operate.

[0060] Understandably, the cooling medium is split during warm-up to allow the first and second water circuits to operate simultaneously. Because the flow rates of the split medium differ, the flow rate through the radiator 400 accounts for much more than 50%, hence the second water circuit is called the "large circulation," used to achieve the beneficial effect of quickly reducing the engine temperature through the radiator 400; the flow rate through the oil-water heat exchanger 600 accounts for much less than 50%, hence the first water circuit is called the "small circulation," used to achieve the beneficial effect of reducing the engine oil temperature.

[0061] Please see Figure 1 and Figure 2 As an optional embodiment, the cooling water pump 500 includes a pump body 550, a pump inlet pipe 510, and a pump outlet pipe 530. The pump inlet pipe 510 connects the first cooling channel 110 and the pump body 550, and the pump outlet pipe 530 connects the pump body 550 and the second cooling channel 210. The pump inlet pipe 510 and the pump outlet pipe 530 are located on the air intake side of the cylinder block 100, and the pump body 550 is located on the side of the cylinder block 100.

[0062] It should be noted that, with Figure 1 The first-view diagram shown is a front-side view of the water-cooled engine 10, that is, a front-side view of the cylinder block 100. Furthermore, the front of the cylinder block 100 is the exhaust side, and the rear of the cylinder block 100 is the intake side. Also based on... Figure 1 This is a frontal view of the water-cooled engine 10. The water pump body 550 is located on the side of the cylinder block 100, i.e., on the right side of the diagram. This arrangement significantly shortens the flow distance between the water pump inlet pipe 510 and the water pump outlet pipe 530.

[0063] like Figure 5 As shown, as an optional embodiment, the cylinder block 100 is provided with an engine water inlet 130 and an engine water outlet 150 on the exhaust side. The engine water inlet 130 is the opening at one end of the first cooling channel 110 that is connected to the radiator 400, and the engine water outlet 150 is the opening at one end of the oil-water heat exchanger 600 that is connected to the water passage chamber 250.

[0064] In this embodiment, since both the engine water inlet 130 and the engine water outlet 150 are located on the exhaust side of the cylinder block 100, they can be connected to the radiator 400 and the oil-water heat exchanger 600 at close range. This avoids the problem of external water pipes being connected around the engine water inlet 130 and the engine water outlet 150 because they are on different sides, shortens the size of the connecting water pipes, and improves the compactness of the water-cooled engine 10 mechanism.

[0065] Please see Figure 6 The water-cooled engine 10 also includes an engine inlet / outlet cover 700. The engine outlet 150 and engine inlet 130 are covered by the engine inlet / outlet cover 700, and the thermostat valve assembly 300 is integrated onto the engine inlet / outlet cover 700. In this way, the engine inlet / outlet cover 700 can both seal off the entire circulation system consisting of the first and second water circulation paths and serve as the junction point of the entire circulation system, thus facilitating the connection of the oil-water heat exchanger 600 and simultaneously supporting the installation of the thermostat valve assembly 300. Furthermore, the water-cooled engine 10 uses an integrated engine inlet / outlet cover 700, resulting in a more compact structural design.

[0066] For details, please refer to the following again. Figure 7The thermostat valve assembly 300 includes a thermostat valve seat 350, a thermostat valve body 310, and a thermostat valve cover 330. The mating surface between the cylinder block 100 and the crankcase 800 is the lower mating surface. The thermostat valve seat 350 extends downwards from the cylinder block 100 and is close to the crankcase 800. The thermostat valve body 310 is mounted on the thermostat valve seat 350 and is located at the engine coolant outlet 150. The thermostat valve cover 330 is mounted on the thermostat valve seat 350 and is connected to the thermostat valve body 310. The thermostat valve cover 330 has a first interface 331 that communicates with the radiator 400.

[0067] The above configuration means that when the cooling medium reaches the preset temperature, the thermostatic valve body 310 opens, and the cooling medium flows from the engine outlet 150 to the thermostatic valve body 310, and then through the thermostatic valve cover 330 connected to the thermostatic valve body 310 to the first interface 331, thus returning to the radiator 400. Furthermore, please refer again to... Figure 2 The arched design of the thermostat valve seat 350 extending downward beyond the cylinder block 100 and close to the crankcase 800 allows the thermostat valve body 310 in the thermostat valve assembly 300 to be better positioned away from the exhaust position, thereby reducing the thermal radiation effect from the exhaust pipe.

[0068] Specifically, please refer to [the relevant document] again. Figure 1 The radiator 400 includes a radiator body 450, a radiator inlet pipe 430, and a radiator outlet pipe 410. The engine inlet / outlet cap 700 is provided with a second interface 710 communicating with the engine inlet 130. One end of the radiator outlet pipe 410 is connected to the second interface 710, and the other end is connected to the radiator body 450. One end of the radiator inlet pipe 430 is connected to the first interface 331, and the other end is connected to the radiator body 450. Through this arrangement, the cooling medium in the radiator 400 flows through the radiator outlet pipe 410 and the second interface 710 to the engine inlet 130. Meanwhile, the cooling medium flowing out of the engine outlet 150 passes through the thermostat valve body 310, the thermostat valve cover 330, the first interface 331, and the radiator inlet pipe 430 before returning to the radiator 400, thus achieving a second water circulation.

[0069] Please refer to this again. Figure 3 The engine water inlet 130 and engine water outlet 150 are both located on the cylinder block 100. The first cooling channel 110 is connected to the cooling water pump 500 at one end, which is the cylinder block water outlet 170. The second cooling channel 210 is connected to the cooling water pump 500 at one end, which is the cylinder head water inlet 230. The water passage chamber 250 is connected to the second cooling channel 210 and the engine water outlet 150.

[0070] A sealing gasket 900 is provided between the cylinder block 100 and the cylinder head 200, and the sealing gasket 900 is provided with a water passage hole 910 corresponding to the water passage chamber 250, so that the cooling medium flowing out of the water passage chamber 250 can flow through the water passage chamber 250 to the engine outlet 150 at the cylinder block 100, and the cooling medium will not leak during this process.

[0071] It should be noted that, Figure 8 The black arrows indicate the flow direction of the cooling medium in the first cooling channel 110 and the second cooling channel 210. Specifically, the cooling medium enters the engine inlet 130 through the radiator 400 to enter the cylinder block 100, then cools the cylinder block 100 through the first cooling channel 110 and flows to the cooling water pump 500 from the cylinder block outlet 170. In this process, the first cooling channel 110 is the cylinder block 100 water jacket built into the cylinder block 100. Immediately afterwards, the cooling medium is pumped by the cooling water pump 500 into the cylinder head inlet 230 to enter the cylinder head 200, and then cools the cylinder head 200 through the second cooling channel 210 while flowing to and through the water passage chamber 250 opened on the mating surface between the cylinder head 200 and the cylinder block 100 to the engine outlet 150 located in the cylinder block 100. In this process, the second cooling channel 210 is the cylinder head 200 water jacket built into the cylinder head 200.

[0072] Please see 9 and Figure 10 To ensure the uniformity of the water-cooled engine 10, the engine outlet 150 is positioned at the middle of the first cooling channel 110 in the cylinder block 100, and the engine inlet 130 and the cylinder block outlet 170 are symmetrically positioned in the cylinder block 100 with respect to the first cooling channel 110.

[0073] In detail, Figure 1 The viewpoint is from the front of the cylinder block 100. The engine water outlet 150 is positioned at the midpoint of the front end of the cylinder block 100 relative to the first cooling channel 110. Simultaneously, the engine water inlet 130 and the cylinder block water outlet 170 are positioned symmetrically relative to the center of the first cooling channel 110. That is to say, as... Figure 9 As shown, if the engine water inlet 130 is located at the front of cylinder A of cylinder block 100, the cylinder outlet 170 will be located at the rear of cylinder block 100, at cylinder D; Figure 10 As shown, if the engine water inlet 130 is located at the front of cylinder B on the cylinder block 100, the cylinder block water outlet 170 will be located at the rear of cylinder C on the cylinder block 100. This ensures that the flow path of the cooling medium in the first cooling channel 110 is consistent, thus guaranteeing uniform cooling of each cylinder of the engine.

[0074] Please see Figure 1 , Figure 2 , Figure 11 as well as Figure 12 The black arrows in the diagram indicate the direction of the cooling medium flow. An oil-water heat exchanger 600 is mounted on the crankcase 800 and has a cooling medium passage 650. One end of the oil-water heat exchanger inlet passage 610 is connected to the engine outlet 150, and the other end of the oil-water heat exchanger inlet passage 610 is connected to the cooling medium passage 650 via the crankcase 800. One end of the oil-water heat exchanger outlet passage 630 is connected to the engine inlet 130, and the other end of the oil-water heat exchanger outlet passage 630 is connected to the cooling medium passage 650 via the crankcase 800.

[0075] It should be noted that, please refer to Figure 2 , Figure 11 and Figure 13 The oil-water heat exchanger inlet channel 610 is connected to the cooling medium channel 650 via the cooling medium inlet 850, and the oil-water heat exchanger outlet channel 630 is connected to the cooling medium channel 650 via the cooling medium outlet 870. In addition, the crankcase 800 also has a built-in oil inlet channel 810 and an oil outlet channel 830, and the oil-water heat exchanger 600 also has a built-in oil channel 670. The oil inlet channel 810 is connected to the oil channel 670 via the oil inlet 811, and the oil outlet channel 830 is connected to the oil channel 670 via the oil outlet 831. Figure 2 , Figure 11 as well as Figure 13 The transparent arrows indicate the direction of oil flow. This setup ensures that the cooling medium and oil flow simultaneously through the oil-water heat exchanger 600 for heat exchange.

[0076] It should also be noted that the oil-water heat exchanger inlet channel 610 includes a first inlet channel 611 and a second inlet channel 613 that are interconnected, wherein the first inlet channel 611 is built into the cylinder block 100 and the second inlet channel 613 is built into the crankcase 800; similarly, the oil-water heat exchanger outlet channel 630 includes a first outlet channel 631 and a second outlet channel 633 that are interconnected, wherein the first outlet channel 631 is built into the cylinder block 100 and the second inlet channel 613 is built into the crankcase 800.

[0077] With the above configuration, this application uses a built-in oil-water heat exchanger inlet channel 610, oil-water heat exchanger outlet channel 630, oil inlet channel 810, and oil outlet channel 830 to replace the original external pipes used to connect the oil-water heat exchanger 600 to the engine inlet 130 or engine outlet 150. Thus, when the oil-water heat exchanger 600 is installed in such a configuration... Figure 1When viewed from the front of the water-cooled engine 10, the oil-water heat exchanger 600 can not only blow natural air to ensure heat dissipation, but also avoid the need for external water pipes, improve the compactness of the water-cooled engine 10, simplify the space at the front of the water-cooled engine 10, improve the aesthetics of the water-cooled engine 10, and reduce the risk of leakage and flow resistance of external pipes.

[0078] Furthermore, it is understood that, based on the fact that the engine water inlet 130 and engine water outlet 150 of this application are located on the same side (i.e., the engine exhaust side), the built-in oil-water heat exchanger inlet channel 610 and oil-water heat exchanger outlet channel 630 are not affected by space constraints, have fewer bends, and lower flow resistance, while also simplifying the assembly and maintenance of the oil-water heat exchanger 600. In addition, the oil-water heat exchanger 600 of this invention is located on the crankcase 800, away from the engine exhaust pipe, which can effectively reduce the thermal damage effect of the exhaust pipe.

[0079] To make the water-cooled engine structure more compact, the oil-water heat exchanger 600 adopts a square structure with adjustable length and width, which is more adaptable to engine space requirements compared to a circular structure. Furthermore, the oil-water heat exchanger 600 is made entirely of aluminum alloy and can be configured in a square shape to achieve high heat exchange efficiency and lightweight performance.

[0080] Taking this embodiment as an example, the working process and working principle of the water-cooled engine 10 are as follows:

[0081] When the water-cooled engine 10 is running, it is in a cold state. The radiator 400 sends the cooling medium stored inside to the second interface 710 through the radiator outlet pipe 410, and then through the second interface 710 to the engine inlet 130 and into the first cooling channel 110 to enter the cylinder block 100. After cooling the cylinder block 100, it flows out of the cylinder block 100 through the cylinder block outlet 170, which is symmetrical to the engine inlet 130.

[0082] The water pump body 550 is connected to the cylinder block outlet 170 via the water pump inlet pipe 510. Therefore, the cooling medium enters the water pump body 550 and is pumped by the water pump body 550 to the cylinder head inlet 230, which is connected to the water pump outlet pipe 530. The cooling medium then enters the cylinder head 200 and flows into the second cooling channel 210 to cool the cylinder head 200. A water passage chamber 250 is provided on the mating surface between the cylinder head 200 and the cylinder block 100, connecting the second cooling channel 210 and the engine outlet 150. Based on this, the cooling medium flows to the engine outlet 150 through the water passage chamber 250.

[0083] At this time, since the water-cooled engine 10 is in a cold state, the thermostat valve 310 has not yet opened. The water-cooled engine 10 enters the first water circuit circulation, and the cooling medium flows into and out of the oil-water heat exchanger 600 through the built-in oil-water heat exchanger inlet channel 610 and oil-water heat exchanger outlet channel 630. Therefore, the temperature of the cooling medium is higher than that of the engine oil at this time. As a result, the temperature of the engine oil rises rapidly during the heat exchange process in the oil-water heat exchanger 600, thereby achieving rapid warm-up.

[0084] Subsequently, the water-cooled engine 10 enters the warm-up state. The temperature of the cooling medium in the first water circuit circulation gradually decreases below that of the high-temperature engine oil during operation. At this time, the temperature of the cooling medium gradually increases during heat exchange in the oil-water heat exchanger 600, thereby reaching the preset temperature for opening the thermostat valve assembly 300. Therefore, when the first water circuit circulation returns to the engine inlet, the thermostat valve assembly 300 opens, and the second water circuit circulation begins.

[0085] Through the above configuration, on the one hand, the cylinder block 100 and cylinder head 200 respectively have built-in first cooling channel 110 and second cooling channel 210, thereby achieving stratified cooling of the cooling medium during circulation; on the other hand, the oil-water heat exchanger 600 adopts a first water inlet channel 611 and a first water outlet channel 631 built into the cylinder block 100, and a second water inlet channel 613 and a second water outlet channel 633 built into the crankcase 800, reducing the need for external water pipes and providing a compact design for the water-cooled engine 10. Furthermore, it should be noted that during the operation of the water-cooled engine 10, the first water circuit circulation is always open, further improving the overall cooling effect of the water-cooled engine 10.

[0086] In summary, embodiments of the present invention disclose a water-cooled engine 10, which includes a cylinder block 100, a cylinder head 200, a radiator 400, a cooling water pump 500, an oil-water heat exchanger 600, a thermostat valve assembly 300, and a crankcase 800. When the thermostat valve assembly 300 is closed, the first cooling channel 110, the cooling water pump 500, the second cooling channel 210, the water passage chamber 250, the oil-water heat exchanger 600, and the first cooling channel 110 sequentially form a first water circulation; when the thermostat valve assembly 300 is open, the radiator 400, the first cooling channel 110, the cooling water pump 500, the second cooling channel 210, the water passage chamber 250, the thermostat valve assembly 300, and the radiator 400 sequentially form a second water circulation.

[0087] Through the above-described configuration, the water-cooled engine 10 utilizes its space efficiently, adjusting the positional and connectivity relationships between its various functional components. On one hand, this configuration shortens the water path distance for cooling medium flow and the length of external pipes, thereby reducing pipe flow resistance and improving heat dissipation efficiency. On the other hand, the device also reduces bends in the water pipes, thus lowering assembly difficulty and the risk of cooling medium leakage. Furthermore, this invention reduces the number of water pipes, improves engine compactness, and results in a simpler engine appearance, effectively saving space in the vehicle.

[0088] Example 2

[0089] Based on the same inventive concept, this invention also provides a motorcycle including the aforementioned embodiment 1, thus improving the connection method between the cooling water channels in the water-cooled engine 10, significantly shortening the flow distance between the cylinder block 100 and the radiator 400. Based on this, this application achieves the technical effect of reducing pipe flow resistance on the one hand, and effectively improves the heat dissipation efficiency of the water-cooled engine 10 on the other hand. Of course, the water-cooled engine 10 in embodiment 1 can also be applied to other motorcycles.

[0090] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A water-cooled engine, characterized in that, include: Cylinder block (100), wherein the cylinder block (100) is provided with a first cooling channel (110); Cylinder head (200), wherein the cylinder head (200) is provided with a second cooling channel (210); A water passage chamber (250) is disposed at the mating surface between the cylinder head (200) and the cylinder body (100); A radiator (400) is connected to the first cooling channel (110) and is capable of delivering the cooling medium stored inside the radiator (400) to the first cooling channel (110). A cooling water pump (500) is provided, and the first cooling channel (110) and the second cooling channel (210) are both connected to the cooling water pump (500). The cooling water pump (500) is used to pump the cooling medium flowing into the first cooling channel (110) into the second cooling channel (210). An oil-water heat exchanger (600) is provided, wherein the water passage chamber (250) is connected to the second cooling channel (210) and the oil-water heat exchanger (600), and the oil-water heat exchanger (600) is connected to the first cooling channel (110); A thermostatic valve assembly (300) is used to connect or disconnect the water passage chamber (250) from the radiator (400). Crankcase (800); When the thermostatic valve assembly (300) is closed, the first cooling channel (110), the cooling water pump (500), the second cooling channel (210), the water passage chamber (250), the oil-water heat exchanger (600), and the first cooling channel (110) sequentially form a first water circulation. When the thermostat valve assembly (300) is opened, the radiator (400), the first cooling channel (110), the cooling water pump (500), the second cooling channel (210), the water passage chamber (250), the thermostat valve assembly (300), and the radiator (400) sequentially form a second water circulation. The cylinder block (100) is provided with an engine water inlet (130) and an engine water outlet (150) on the exhaust side. The engine water inlet (130) is the opening at one end of the first cooling channel (110) that is connected to the radiator (400), and the engine water outlet (150) is the opening at one end of the oil-water heat exchanger (600) that is connected to the water passage chamber (250). The oil-water heat exchanger (600) is mounted on the crankcase (800) and has a cooling medium passage (650). One end of the oil-water heat exchanger inlet passage (610) is connected to the engine outlet (150), and the other end of the oil-water heat exchanger inlet passage (610) is connected to the cooling medium passage (650) via the crankcase (800). One end of the oil-water heat exchanger outlet passage (630) is connected to the engine inlet (130), and the other end of the oil-water heat exchanger outlet passage (630) is connected to the cooling medium passage (650) via the crankcase (800). The oil-water heat exchanger inlet channel (610) includes a first inlet channel (611) and a second inlet channel (613) that are interconnected, wherein the first inlet channel (611) is built into the cylinder block (100) and the second inlet channel (613) is built into the crankcase (800); the oil-water heat exchanger outlet channel (630) includes a first outlet channel (631) and a second outlet channel (633) that are interconnected, wherein the first outlet channel (631) is built into the cylinder block (100) and the second inlet channel (613) is built into the crankcase (800).

2. The water-cooled engine according to claim 1, characterized in that, The water-cooled engine (10) also includes an engine inlet / outlet cover (700), the engine outlet (150) and the engine inlet (130) are covered by the engine inlet / outlet cover (700), and the thermostatic valve assembly (300) is integrated on the engine inlet / outlet cover (700).

3. The water-cooled engine according to claim 2, characterized in that, The thermostat valve assembly (300) includes a thermostat valve seat (350), a thermostat valve body (310), and a thermostat valve cover (330). The mating surface between the cylinder block (100) and the crankcase (800) is the lower mating surface. The thermostat valve seat (350) extends downward in an arch shape beyond the cylinder block (100) and is close to the crankcase (800). The thermostat valve body (310) is disposed on the thermostat valve seat (350) and is located at the engine outlet (150). The thermostat valve cover (330) is disposed on the thermostat valve seat (350) and is connected to the thermostat valve body (310). The thermostat valve cover (330) has a first interface (331) that communicates with the radiator (400).

4. The water-cooled engine according to claim 3, characterized in that, The radiator (400) includes a radiator body (450), a radiator inlet pipe (430), and a radiator outlet pipe (410). The engine inlet / outlet cover (700) is provided with a second interface (710) that communicates with the engine inlet (130). One end of the radiator outlet pipe (410) is connected to the second interface (710), and the other end of the radiator outlet pipe (410) is connected to the radiator body (450). One end of the radiator inlet pipe (430) is connected to the first interface (331), and the other end of the radiator inlet pipe (430) is connected to the radiator body (450).

5. The water-cooled engine according to claim 1, characterized in that, The engine water inlet (130) and the engine water outlet (150) are both located in the cylinder block (100), and the opening of the first cooling channel (110) connected to the cooling water pump (500) is the cylinder block water outlet (170); the opening of the second cooling channel (210) connected to the cooling water pump (500) is the cylinder head water inlet (230); the water passage chamber (250) connects the second cooling channel (210) and the engine water outlet (150).

6. The water-cooled engine according to claim 5, characterized in that, The engine water outlet (150) is located at the middle position of the first cooling channel (110) in the cylinder block (100), and the engine water inlet (130) and the cylinder block water outlet (170) are symmetrically arranged in the cylinder block (100) with respect to the first cooling channel (110).

7. The water-cooled engine according to claim 1, characterized in that, The cooling water pump (500) includes a pump body (550), a pump inlet pipe (510), and a pump outlet pipe (530). The pump inlet pipe (510) connects the first cooling channel (110) and the pump body (550), and the pump outlet pipe (530) connects the pump body (550) and the second cooling channel (210). The pump inlet pipe (510) and the pump outlet pipe (530) are located on the air intake side of the cylinder (100), and the pump body (550) is located on the side of the cylinder (100).

8. A motorcycle, characterized in that, Includes the water-cooled engine (10) as described in any one of claims 1-7.

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