An engine and a motorcycle

Abstract

This invention discloses an engine and a motorcycle, including a coolant pump, a cylinder block water jacket, a cylinder head water jacket, and an internal flow channel connecting the outlet of the coolant pump and the inlet of the cylinder block water jacket. It also includes a distributor installed inside the inlet of the cylinder block water jacket, with guide channels on the distributor to guide a portion of the coolant to flow circumferentially along the cylinder block water jacket, cooling each cylinder sequentially before entering the cylinder head water jacket. Thus, by diverting and guiding the coolant through the guide channels on the distributor, each cylinder can be adequately cooled, ensuring a more balanced cooling effect for each cylinder and avoiding uneven heat dissipation performance and uncontrollable heat load among engine cylinders, thereby extending the engine's average service life. Simultaneously, a vertical flow channel is used to create a separate flow channel for a portion of the coolant to enter the exhaust nose section of the cylinder head water jacket, focusing on cooling the high-temperature area and rationally controlling the coolant flow rate in the exhaust nose section.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an engine. The present application also relates to a motorcycle. BACKGROUND

[0002] In the field of automobile industry, a motorcycle is a kind of vehicle widely used.

[0003] The engine of the motorcycle is provided with a cooling system to cool the engine. The cooling system of the engine generally includes a cooling water pump, a water jacket, an oil-water exchanger, a thermostat, a radiator and the like. The water jacket can be further divided into a cylinder body water jacket and a cylinder head water jacket.

[0004] In a traditional motorcycle engine, the outlet of the cooling water pump and the inlet of the water jacket are connected by an external pipeline. The external pipeline can be arranged with multiple pipelines at the same time, so that the cooling liquid can be introduced into each position of the water jacket at the same time to cool each cylinder at the same time. However, this structure uses more external pipelines and has a complex connection relationship, which can easily adversely affect the layout of the engine.

[0005] As an improvement, in the prior art, the cooling system of some engines no longer uses an external pipeline, but uses an internal flow channel to connect the outlet of the cooling water pump and the inlet of the cylinder body water jacket, which can save a lot of space and is beneficial to the layout of the engine. However, since the inlet of the cylinder body water jacket is generally arranged near the first cylinder, when the internal flow channel is used to introduce the cooling liquid, most of the cooling liquid flows to the area near the first cylinder after entering the inlet of the cylinder body water jacket, such as the cylinder intake side, the cylinder exhaust side, the exhaust nose beam area and the like around the first cylinder, and then directly flows upward to the cylinder head water jacket, so that most of the cooling liquid flows out through the cylinder head water jacket without cooling the second cylinder (or even more cylinders), only a small part of the cooling liquid can slowly flow into the area near the second cylinder, resulting in a serious shortage of cooling liquid flow allocated to the second cylinder, and ultimately causing the cooling effect of only the first cylinder to be good, while the cooling effect of the remaining cylinders to be poor. If the cooling effect of each cylinder of the engine is not balanced, the temperature cannot be kept consistent, the overall heat dissipation effect of the engine cannot meet the requirements, the thermal stress and work uniformity of the engine are difficult to control, and ultimately the average service life of the engine is reduced.

[0006] Therefore, how to sufficiently cool each cylinder and try to ensure that the cooling effect of each cylinder is balanced to avoid the situation that the heat dissipation performance of each cylinder of the engine is uneven and the thermal load is difficult to control, and to prolong the average service life of the engine, is a technical problem faced by those skilled in the art. SUMMARY

[0007] The engine can sufficiently cool each cylinder, ensure that the cooling effect of each cylinder tends to be balanced, avoid uneven heat dissipation performance and difficult heat load control of each cylinder of the engine, and prolong the average service life of the engine.

[0008] To solve the above technical problems, the present application provides an engine, which comprises a cooling water pump, a cylinder body water jacket, a cylinder head water jacket, and an internal flow channel communicated between a water outlet of the cooling water pump and a water inlet of the cylinder body water jacket, and further comprises a flow divider installed in the water inlet of the cylinder body water jacket, wherein a flow guide groove is formed in the flow divider, and the flow guide groove is used to guide part of the cooling liquid to flow along the circumference of the cylinder body water jacket, so as to enter the cylinder head water jacket after sequentially cooling each cylinder.

[0009] Preferably, the water inlet of the cylinder body water jacket is located at the end of the exhaust side of the cylinder body water jacket, which is away from the water outlet of the cylinder head water jacket, and the flow direction of the flow guide groove is towards the exhaust side.

[0010] Preferably, a flow guide slope is arranged at the bottom of the water inlet of the cylinder body water jacket, the flow guide groove is arranged at the bottom of the flow divider, and the shape of the flow guide groove matches the shape of the flow guide slope.

[0011] Preferably, a vertical flow-through groove is formed in the side wall of the flow divider, the bottom of the vertical flow-through groove is communicated with the flow guide groove, and the top of the vertical flow-through groove is communicated with the cylinder head water jacket, so as to guide part of the cooling liquid to flow upwards to the exhaust nose bridge part of the cylinder head water jacket after passing through the flow guide groove.

[0012] Preferably, the exhaust nose bridge part of the cylinder head water jacket is provided with a plurality of exhaust side water inlets, the top of the exhaust side of the cylinder body water jacket is provided with a plurality of exhaust side upper water holes respectively communicated with the exhaust side water inlets, and the top of the vertical flow-through groove is communicated with the exhaust side upper water holes.

[0013] Preferably, the intake nose bridge part of the cylinder head water jacket is provided with a plurality of intake side water inlets, and the top of the intake side of the cylinder body water jacket is provided with a plurality of intake side upper water holes respectively communicated with the intake side water inlets.

[0014] Preferably, the end of the upper nose bridge part of the cylinder head water jacket, which is away from the water outlet of the cylinder head water jacket, is provided with a plurality of distal end water inlets, and the connection area of the exhaust side and the intake side of the cylinder body water jacket is provided with a plurality of terminal upper water holes respectively communicated with the distal end water inlets.

[0015] Preferably, a horizontal flow-through groove is formed in the top of the flow divider, which is used to make part of the cooling liquid flowing through the intake side of the cylinder body water jacket flow to each exhaust side upper water hole.

[0016] Preferably, one end of the transverse flow channel is provided with an extension, the extension extends a predetermined length toward each of the exhaust side water holes, and the top of the vertical flow channel communicates with the transverse flow channel at the extension.

[0017] The present invention also provides a motorcycle, including a chassis and an engine disposed within the chassis, wherein the engine is specifically the engine described in any of the preceding claims.

[0018] The engine provided by this invention mainly includes a cooling water pump, a cylinder block water jacket, a cylinder head water jacket, an internal flow channel, and a distributor. The cooling water pump is primarily used to pump coolant. The cylinder block water jacket surrounds each cylinder block and is mainly used to cool the cylinder blocks (including the intake and exhaust sides). An inlet is provided on the cylinder block water jacket for coolant to flow into. The cylinder head water jacket covers each cylinder head and communicates with the cylinder block water jacket, primarily used to cool the cylinder heads (including the intake manifold, exhaust manifold, and combustion chamber). One end of the internal flow channel communicates with the outlet of the cooling water pump, and the other end communicates with the inlet of the cylinder block water jacket, primarily used to introduce coolant into the cylinder block water jacket. The distributor, a core component, is installed inside the inlet of the cylinder block water jacket and is mainly used to divert and guide the coolant as it flows into the inlet. A flow guide channel is provided on the distributor. This channel is mainly used to guide a portion of the coolant, allowing it to flow circumferentially around the cylinder block water jacket, forming a circulation around each cylinder. During this flow, each cylinder (exhaust and intake sides) is cooled sequentially until it completes a full circle around the cylinder block water jacket before flowing upwards into the cylinder head water jacket, finally exiting through the outlet of the cylinder head water jacket. Thus, the flow guide channel on the distributor diverts and guides the coolant, ensuring that after it flows in from the inlet of the cylinder block water jacket, a portion of the coolant circulates circumferentially around the jacket, cooling each cylinder sequentially and ensuring that each cylinder receives adequate cooling. Compared to existing technologies, after the coolant enters the cylinder block water jacket inlet, it is guided by the flow channels to circulate along the cylinder block water jacket and then flow upwards into the cylinder head water jacket. This avoids the situation where the coolant flows upwards to the cylinder head water jacket after passing through the first cylinder. The coolant flow path is significantly extended, allowing for more thorough heat removal from each cylinder. Therefore, the engine provided by this invention can adequately cool each cylinder, ensuring a more balanced cooling effect across all cylinders. This avoids uneven heat dissipation performance and uncontrollable heat load across different cylinders, thus extending the engine's average service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention.

[0021] Figure 2 for Figure 1 A partial structural diagram.

[0022] Figure 3 for Figure 2 Another perspective illustration.

[0023] Figure 4 This is a front view of the cylinder water jacket structure.

[0024] Figure 5 This is a top view of the cylinder water jacket structure.

[0025] Figure 6 This is a schematic diagram of the specific structure of the cylinder head water jacket.

[0026] Figure 7 This is a schematic diagram of the specific structure of the splitter.

[0027] Figure 8 for Figure 7 Another perspective illustration.

[0028] Figure 9 for Figure 7 Top view.

[0029] Figure 10 for Figure 7 Side view.

[0030] Figure 11 for Figure 2 Another perspective illustration.

[0031] Figure 12 for Figure 11 The AA screenshot shown is a cross-sectional view.

[0032] in, Figure 1 — Figure 12 middle:

[0033] Cooling water pump—1, cylinder block water jacket—2, cylinder head water jacket—3, internal flow channel—4, distributor—5, thermostat—6, radiator—7, oil-water exchanger—8;

[0034] Exhaust side—201, Intake side—202;

[0035] Exhaust nose bridge section—301, intake nose bridge section—302, upper nose bridge section—303;

[0036] Guide slope—21, exhaust side water inlet—22, intake side water inlet—23, end water inlet—24;

[0037] Water outlet—31, exhaust side water inlet—32, air intake side water inlet—33, remote water inlet—34;

[0038] Flow guide channel—51, vertical flow channel—52, transverse flow channel—53, extension—54. Detailed Implementation

[0039] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 11 , Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention. Figure 2 for Figure 1 A partial structural diagram, Figure 3 for Figure 2 Another perspective illustration, Figure 11 for Figure 2 Another perspective illustration.

[0041] In one specific embodiment provided by the present invention, the engine mainly includes a cooling water pump 1, a cylinder block water jacket 2, a cylinder head water jacket 3, an internal flow channel 4, and a distributor 5. In addition, the engine may also include components such as a thermostat 6, a radiator 7, and an oil-water exchanger 8.

[0042] Among them, cooling water pump 1 is mainly used to pump coolant.

[0043] The cylinder block water jacket 2 is installed inside the engine cylinder block and is mainly used to cool the cylinder blocks of each cylinder (including the intake and exhaust sides). The cylinder block water jacket 2 is equipped with a water inlet for coolant to flow in.

[0044] The cylinder head water jacket 3 is installed inside the cylinder head of the engine and is connected to the cylinder block water jacket 2. It is mainly used to cool the cylinder heads of each cylinder (including the intake manifold, exhaust manifold, combustion chamber, etc.).

[0045] One end of the built-in flow channel 4 is connected to the outlet of the cooling water pump 1, and the other end of the built-in flow channel 4 is connected to the inlet of the cylinder water jacket 2. It is mainly used to introduce coolant into the cylinder water jacket 2.

[0046] The distributor 5 is the core component, installed inside the inlet of the cylinder block water jacket 2. It is mainly used to divert and guide the coolant as it flows into the inlet of the cylinder block water jacket 2. A guide groove 51 is provided on the distributor 5. This guide groove 51 is mainly used to guide part of the coolant so that part of the coolant can flow along the circumferential direction of the cylinder block water jacket 2 through the guide groove 51, forming a circulation around each cylinder. In this process, each cylinder (exhaust side and intake side) is cooled sequentially until it has circled the cylinder block water jacket 2 once and flows upward into the cylinder head water jacket 3, and finally is discharged through the outlet 31 of the cylinder head water jacket 3.

[0047] Generally, when coolant enters the cylinder block water jacket 2, the circulating flow of coolant ensures that the top surface of the distributor 5 is in close contact with the top surface of the cylinder block water jacket 2. At the same time, the overall dimensions of the distributor 5 are basically consistent with the dimensions of the inlet of the cylinder block water jacket 2, and the circumferential gap between the overall shape of the distributor 5 and the inlet of the cylinder block water jacket 2 is controlled within 1-3mm. The purpose is to allow a small portion of coolant to flow directly upward through the inlet of the cylinder block water jacket 2 into the exhaust nose section 301 of the cylinder head water jacket 3.

[0048] Thus, through the diversion and guiding effect of the guide groove 51 on the distributor 5, after the coolant flows in from the inlet of the cylinder block water jacket 2, some of the coolant can circulate around the circumference of the cylinder block water jacket 2, thereby cooling each cylinder sequentially during the circulation process, ensuring that each cylinder is adequately cooled. Compared with the prior art, after the coolant enters the inlet of the cylinder block water jacket 2, the guide groove 51 guides the coolant to circulate along the cylinder block water jacket 2 and then flow upward into the cylinder head water jacket 3. This avoids the situation where most of the coolant flows upward into the cylinder head water jacket 3 after passing through the first cylinder. The coolant flow is more complete, ensuring the uniformity of the coolant flow velocity distribution in the cooling water jackets of each cylinder of the multi-cylinder engine, significantly improving the engine's heat dissipation, and effectively improving the problems of uneven engine thermal stress and differences in the uniformity of power output between cylinders.

[0049] Therefore, the engine provided in this embodiment can adequately cool each cylinder, ensuring that the cooling effect of each cylinder is as balanced as possible, avoiding uneven heat dissipation performance of each cylinder and difficulty in controlling the heat load, and extending the average service life of the engine.

[0050] Both the cylinder block water jacket 2 and the cylinder head water jacket 3 can be divided into several parts according to the location of the intake and exhaust passages. The cylinder block water jacket 2 includes an exhaust side 201 and an intake side 202, while the cylinder head water jacket 3 includes an exhaust nose bridge 301 (with the exhaust passage installed around it), an intake nose bridge 302 (with the intake passage installed around it), and an upper nose bridge 303 connecting the two (with the water outlet 31 installed at one end of the upper nose bridge 303).

[0051] like Figure 4 , Figure 5 As shown, Figure 4 This is a front view of the water jacket 2 of the cylinder body. Figure 5 This is a top view of the structure of the cylinder water jacket 2.

[0052] In one optional embodiment of the cylinder block water jacket 2, the inlet of the cylinder block water jacket 2 is specifically located at the end of the exhaust side 201, away from the outlet 31 of the cylinder head water jacket 3, as shown in Figure 2, at the left end of the cylinder block water jacket 2. Simultaneously, the guide channel 51 of the distributor 5 is directed towards the exhaust side 201 of the cylinder block water jacket 2. With this configuration, when the coolant enters the inlet of the cylinder block water jacket 2, it first cools the exhaust side of the first cylinder. Then, during subsequent circulation, it sequentially cools the exhaust sides of the second cylinder, etc., thereby ensuring that the coolant first cools the higher-temperature exhaust sides of each cylinder, and only after the exhaust sides of all cylinders are cooled does it begin to cool the intake sides of each cylinder.

[0053] To facilitate the flow of coolant along the exhaust side 201 of the cylinder block water jacket 2, in this embodiment, a guide slope 21 is provided at the bottom of the cylinder block water jacket 2 at the inlet position. Simultaneously, the shape of the guide groove 51 of the distributor 5 matches the shape of the guide slope 21. With this configuration, when the coolant is guided by the guide groove 51 and diverted, it will simultaneously be continuously guided along the slope of the guide slope 21, thus stably guiding the coolant into the depth of the exhaust side 201 of the cylinder block water jacket 2.

[0054] Furthermore, in order to increase the flow velocity of the coolant in the cylinder water jacket 2, in this embodiment, both the guide slope 21 and the guide groove 51 are arc-shaped, so that the coolant can flow smoothly along the arc surface of the guide slope 21 and the guide groove 51, thereby reducing liquid resistance and reducing coolant loss.

[0055] Considering that not only the cylinder block needs cooling, but also components on the cylinder head such as the intake manifold, exhaust manifold, and combustion chamber, especially the exhaust manifold, which has a very high temperature and requires focused cooling, this embodiment provides a vertical flow channel 52 on the side wall of the distributor 5. This vertical flow channel 52 extends vertically (or along the height of the distributor 5) to the top of the distributor 5, with its bottom connected to the guide channel 51 and its top connected to the cylinder head water jacket 3. This vertical flow channel 52 also guides a portion of the coolant, allowing some coolant to flow directly and independently to the exhaust nose section 301 of the cylinder head water jacket 3, thus providing focused cooling to the high-temperature exhaust nose section of the cylinder head through an independent flow channel. With this configuration, when the coolant enters the inlet of the cylinder block water jacket 2, part of the coolant will flow horizontally along the guide groove 51 and the guide slope to the exhaust side 201 of the cylinder block water jacket 2, while another part of the coolant will flow upward along the vertical flow groove 52 and directly enter the cylinder head water jacket 3. Of course, this part of the coolant is not directly discharged, but rather it is used to directly cool the cylinder head, such as focusing on fully cooling the area near the cylinder head exhaust passage.

[0056] like Figure 6 As shown, Figure 6 This is a schematic diagram of the specific structure of the cylinder head water jacket 3.

[0057] Furthermore, to ensure that the coolant, after entering the cylinder head water jacket 3 along the vertical flow channel 52, forms an independent flow channel to directly cool the high-temperature exhaust nose section 301 of the cylinder head water jacket 3, this embodiment provides multiple exhaust-side inlets 32, such as three or more, at the bottom of the exhaust nose section 301 of the cylinder head water jacket 3. To facilitate the flow of coolant along the exhaust nose section of the cylinder head water jacket 3, in this embodiment, the exhaust-side inlets 32 in the cylinder head water jacket 3 are all independent flow channels. This makes it easier to control the flow rate of coolant into the exhaust nose section 301 area of ​​the cylinder head water jacket 3, thereby ensuring the cooling of the high-temperature exhaust side area of ​​the cylinder head water jacket. Simultaneously, this embodiment also provides multiple exhaust-side water inlets 22 on the top surface of the exhaust side section 201 of the cylinder head water jacket 2, and connects each exhaust-side water inlet 22 to each exhaust-side water inlet 32 ​​of the exhaust nose section 301. Furthermore, the top of the vertical flow channel 52 is connected to each exhaust-side water inlet 22. With this configuration, when the coolant rises to the top along the vertical flow channel 52, it will be divided into several streams and enter each exhaust-side water inlet 22, and then enter each exhaust-side water inlet 32. This allows the coolant to enter the cylinder head water jacket 3 directly from the cylinder block water jacket 2 through several independent flow channels without the need for circulation. During the flow process, each exhaust nose section 301 on the cylinder head water jacket 3 is cooled, ensuring that each exhaust nose section 301 with a higher temperature is allocated a higher coolant flow rate.

[0058] Of course, in addition to the exhaust nose section 301, which has a higher temperature, the intake nose section 302, which has a relatively lower temperature, also needs cooling, although the coolant flow rate requirement is lower. Therefore, in this embodiment, it is not necessary to set separate flow channels for each intake nose section 302 on the cylinder head water jacket 3. Instead, several intake-side water inlets 33 are provided at the bottom of each intake nose section 302, and several intake-side water inlets 23 are opened on the top surface of the intake side section 202 of the cylinder head water jacket 2. Specifically, the positions of each intake-side water inlet 33 are generally opposite to each exhaust-side water inlet 32, located on both sides of the cylinder head water jacket 3 in the width direction—the high-temperature side and the low-temperature side, respectively, and the number of intake-side water inlets 33 is generally less than the number of exhaust-side water inlets 32. Correspondingly, each intake-side water inlet 23 is connected to its corresponding intake-side water inlet 33. With this configuration, when a portion of the circulating coolant flows to the intake side 202 of the cylinder head water jacket 2, some of the coolant will enter the intake side inlet 33 through the intake side water inlet 23, and then enter the low temperature side or intake side of the cylinder head water jacket 3, so as to cool the intake nose section 302 during the flow process.

[0059] In addition, the upper nose section 303 of the cylinder head water jacket 3 also needs to be cooled. Since the upper nose section 303 connects the intake nose section 302 and the exhaust nose section 301, the side of the upper nose section 303 connected to the exhaust nose section 301 has a higher temperature and requires more focused cooling, while the side of the upper nose section 303 connected to the intake nose section 302 has a lower temperature and requires less cooling. To address this, this embodiment provides several distal water inlets 34 at the end of the upper nose section 303 furthest from the outlet 31 of the cylinder head water jacket 3. Each distal water inlet 34 is essentially distributed at both ends of the cylinder head water jacket 3 along its length, similar to the outlet 31. Meanwhile, in this embodiment, several end water inlets 24 are provided in the connection area between the exhaust side 201 and the intake side 202 of the cylinder block water jacket 2. The position of each end water inlet 24 on the cylinder block water jacket 2 corresponds to the position of each remote water inlet 34 on the cylinder head water jacket 3, which is equivalent to being located at the end of the entire circulation, and each end water inlet 24 is connected to each remote water inlet 34. With this configuration, after the circulating coolant has basically flowed around the cylinder block water jacket 2 once, it can reach the end of the circulation path, and then enter each remote water inlet 34 through each end water inlet 24, and then enter the cylinder head water jacket 3, mainly entering the upper nose section 303 of the cylinder head water jacket 3 to cool the upper nose section 303.

[0060] Furthermore, as mentioned above, the coolant entering the upper nose section 303 not only cools the upper nose section 303, but also inevitably cools the exhaust nose section 301 and the intake nose section 302. Since the temperature of the exhaust nose section 301 is higher, this embodiment provides throttling components such as guide grooves or guide cylindrical grooves in the upper nose section 303 to direct more coolant in the upper nose section 303 to the exhaust nose section 301, thereby further improving the cooling effect on the high-temperature side of the cylinder head water jacket 3.

[0061] like Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 As shown, Figure 7 This is a schematic diagram of the specific structure of the splitter 5. Figure 8 for Figure 7 Another perspective illustration, Figure 9 for Figure 7 Top view, Figure 10 for Figure 7 Side view, Figure 12 for Figure 11 The AA section sectional view shown.

[0062] Based on the same consideration, this embodiment also provides a transverse flow channel 53 on the top of the distributor 5. Specifically, the transverse flow channel 53 extends horizontally on the distributor 5, with one end connected to the circulation area of ​​the cylinder head water jacket 2, and the other end extending to the top of the exhaust side 201 of the cylinder head water jacket 2, i.e., the location of each exhaust side water inlet 22. With this configuration, when the circulating coolant reaches the end, part of the coolant enters the cylinder head water jacket 3 through the end water inlet 24 and the far end water inlet 34, while part of the coolant continues to circulate through the transverse flow channel 53 of the distributor 5 and enters each exhaust side water inlet 22, and finally enters the exhaust nose section 301 of the cylinder head water jacket 3 through each exhaust side water inlet 32, where it cools the high-temperature side of the cylinder head water jacket 3, such as the exhaust valve, together with the coolant in another part of the independent flow channel.

[0063] Considering that coolant flows through both the vertical flow channel 52 and the horizontal flow channel 53 on the distributor 5, and that they all have the same destination, in this embodiment, an extension 54 is provided at one end of the horizontal flow channel 53. This extension 54 extends a predetermined length toward each exhaust-side water inlet 22, so that the coolant continuing to circulate along the horizontal flow channel 53 can flow along the extension 54 and more easily enter each exhaust-side water inlet 22. Simultaneously, the top of the vertical flow channel 52 communicates with the horizontal flow channel 53 at the extension 54. With this arrangement, the coolant flowing upwards along the vertical flow channel 52 and the coolant circulating along the horizontal flow channel 53 will converge at the extension 54, and the extension 54 will guide them together more easily into each exhaust-side water inlet 22.

[0064] In addition, to ensure that the current splitter 5 achieves the best current splitting effect, the specific structural design and dimensional design of the current splitter 5 are crucial. Specifically, the design points are as follows:

[0065] ① The depth of the distributor 5 is 90% to 100% of the depth of the cylinder water jacket 2; for example, if the depth of the cylinder water jacket 2 is 60mm, then the dimension of the depth H of the distributor 5 is 54mm to 60mm.

[0066] ② The depth h1 of the transverse flow channel 53 of the distributor 5 is 3mm to 5mm, and the length L is 6 to 10mm;

[0067] ③ The depth h2 of the guide groove 51 of the distributor 5 is 10% to 20% of the depth of the cylinder water jacket 2, and the lengths L2 and L3 of the guide groove 51 are both 15mm to 25mm.

[0068] ④ The depth D of the vertical flow channel 52 of the distributor 5 is 6mm to 10mm, and the width W is 10 to 15mm;

[0069] ⑤ The right-side deflection angle β of the extension 54 of the splitter 5 ranges from 7 to 15°.

[0070] Of course, the specific structural design and size design of the above-mentioned distributor 5 are not fixed. They need to be adjusted in practice based on factors such as the specific flow path of the coolant, the water inlet direction of the cylinder block water jacket 2, and the overall flow uniformity of the water jacket.

[0071] This embodiment also provides a motorcycle, which mainly includes a body and an engine installed in the body. The specific details of the engine are the same as those described above, and will not be repeated here.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine comprising a cooling water pump (1), a cylinder block water jacket (2), a cylinder head water jacket (3), and an internal flow passage (4) communicating between a water outlet of the cooling water pump (1) and a water inlet of the cylinder block water jacket (2), characterized in that, The water inlet of the cylinder water jacket (2) is located at the end of the exhaust side (201) away from the water outlet (31) of the cylinder head water jacket (3), and the flow direction of the flow guide groove (51) is towards the exhaust side (201). The side wall of the flow distributor (5) is provided with a vertical flow-through groove (52), the bottom of the vertical flow-through groove (52) is communicated with the flow guide groove (51), and the top of the vertical flow-through groove (52) is communicated with the cylinder head water jacket (3), so that part of the cooling liquid flows upwards to the exhaust nose bridge part (301) of the cylinder head water jacket (3) after passing through the flow guide groove (51).

2. The engine of claim 1, wherein The exhaust nose bridge part (301) of the cylinder head water jacket (3) is provided with a plurality of exhaust side water inlets (32), and the top of the exhaust side (201) of the cylinder water jacket (2) is provided with a plurality of exhaust side upper water holes (22) respectively communicated with the exhaust side water inlets (32), and the top of the vertical flow-through groove (52) is communicated with the exhaust side upper water holes (22).

3. The engine of claim 1 or 2, wherein The intake nose bridge part (302) of the cylinder head water jacket (3) is provided with a plurality of intake side water inlets (33), and the top of the intake side (202) of the cylinder water jacket (2) is provided with a plurality of intake side upper water holes (23) respectively communicated with the intake side water inlets (33).

4. The engine of claim 3, wherein The end of the upper nose bridge part (303) of the cylinder head water jacket (3) away from the water outlet (31) of the cylinder head water jacket (3) is provided with a plurality of distal water inlets (34), and the connection area of the exhaust side (201) and the intake side (202) of the cylinder water jacket (2) is provided with a plurality of terminal upper water holes (24) respectively communicated with the distal water inlets (34).

5. The engine of claim 4, wherein, The top of the flow distributor (5) is provided with a horizontal flow-through groove (53) for guiding part of the cooling liquid flowing through the intake side (202) of the cylinder water jacket (2) to each exhaust side upper water hole (22).

6. The engine of claim 5, wherein, One end of the horizontal flow-through groove (53) is provided with an extension part (54), the extension part (54) extends towards each exhaust side upper water hole (22) by a predetermined length, and the top of the vertical flow-through groove (52) is communicated with the horizontal flow-through groove (53) at the extension part (54).

7. The engine of claim 4, wherein The engine is the engine according to any one of claims 1-8.

8. The engine of claim 7, wherein, ​ 9. A motorcycle comprising a vehicle body and an engine disposed within the vehicle body, characterized by, ​

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