Cooling water passage structure of engine

Abstract

The application provides an engine cooling water path structure and belongs to the technical field of engines. The engine cooling water path structure solves the problems of poor cooling effect and non-compact structure of the existing engine cooling water path structure. The engine cooling water path structure comprises a cylinder body and a cylinder head connected above the cylinder body, a combustion chamber and a cooling water jacket surrounding the combustion chamber are arranged in the cylinder body, the cooling water path structure further comprises a lower water passage arranged in the interior of the cylinder head and capable of being communicated with the water outlet of a cooling water pump, the cylinder body is provided with a water guide passage penetrating through the upper end surface, the outlet of the lower water passage is vertically communicated with the water guide passage, and the lower end of the water guide passage is communicated with the bottom of the cooling water jacket. The engine cooling water path structure can ensure and improve the cooling effect and improve the compactness of the engine structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine, and relates to a cooling water circuit structure of an engine. BACKGROUND

[0002] The cooling of some motorcycle engines is usually achieved by water cooling, and a common way is to drive a water pump by a balance shaft or a crankshaft to make cooling water enter a cylinder body and a cylinder head through a connecting water pipe, and finally flow out through a water outlet of the cylinder head to take away the heat generated by the engine.

[0003] However, the water outlet of the cooling water pump is usually externally connected with a water outlet pipe, and the outlet of the water outlet pipe is directly communicated with the inlet of the cooling water jacket. For example, a cooling structure of a motorcycle water-cooled engine is disclosed in Chinese Patent Application (Grant Announcement No. CN204755055U), which comprises a cylinder body, a cylinder head, a cooling water pump and a radiator of the motorcycle water-cooled engine. The cylinder body and the cylinder head are respectively provided with cooling water channels, and the cooling water channels of the cylinder body and the cylinder head are communicated. One side of the cylinder body is provided with a water inlet, and the water inlet is communicated with the cooling water channel of the cylinder body. One side of the cylinder head is provided with a water outlet, and the water outlet is communicated with the cooling water channel of the cylinder head. The cooling structure further comprises a first cooling water pipe, a second cooling water pipe and a third cooling water pipe. The cooling water pump is fixed on the cylinder head, and the cooling water pump is power-connected with the camshaft of the motorcycle water-cooled engine. The water outlet end of the cooling water pump is communicated with the water inlet of the cylinder body through the first cooling water pipe. The water inlet end of the radiator is communicated with the water outlet of the cylinder head through the second cooling water pipe. The water outlet end of the radiator is communicated with the water inlet end of the cooling water pump through the third cooling water pipe, thereby forming a water cooling circuit of the motorcycle water-cooled engine.

[0004] The above structure makes the cooling water in the cooling water pump flow into the water inlet of the cylinder body through the first cooling water pipe. It can be concluded from the drawings of the specification of the application without any doubt that the first cooling water pipe is transversely connected to the cylinder body. Since the first cooling water pipe is externally connected, the first cooling water pipe can be transversely communicated with the cooling water jacket in the cylinder body, so that the cooling water can enter the cooling water jacket from the lower part of the cooling water jacket. However, the external connection of the first cooling water pipe results in poor compactness of the cooling structure while ensuring good cooling effect due to the limited space for installing the engine on the motorcycle. SUMMARY

[0005] The present application aims at the above problems existing in the prior art, and provides a cooling water circuit structure of an engine. The technical problem to be solved by the present application is how to improve the cooling effect while making the cooling water circuit structure more compact.

[0006] The object of the present application can be achieved by the following technical scheme.

[0007] The application discloses an engine cooling water channel structure, and the engine comprises a cylinder body and a cylinder head connected above the cylinder body, a combustion chamber and a cooling water jacket surrounding the combustion chamber are arranged in the cylinder body, and the engine cooling water channel structure is characterized in that a lower water channel is arranged in the cylinder head and can be communicated with a water outlet of a cooling water pump, a water guide channel is arranged in the cylinder body and penetrates an upper end face, an outlet of the lower water channel is vertically communicated with the water guide channel, and a lower end of the water guide channel is communicated with a bottom of the cooling water jacket.

[0008] Working principle: the lower water channel is arranged in the cylinder head, and an external water pipe is not needed, so that the compactness of the engine structure is high; in order to reduce the influence of the lower water channel on the cylinder head volume, the lower water channel is vertically arranged, so that the outlet of the lower water channel is vertically communicated with the water guide channel, the cooling water in the lower water channel can cool the cylinder head, the cooling water cold energy is more reasonably utilized, the waste of the cooling water cold energy is avoided, the cooling effect of the engine is improved, the cooling water jacket is designed to surround the combustion chamber, so that a large amount of cooling water cold energy is needed to cool the combustion chamber, the cooling water vertically flows into the water guide channel, the lower end of the water guide channel is communicated with the bottom of the cooling water jacket, the cooling water flows into the cooling water jacket from the bottom of the cooling water jacket, the cooling water gradually rises from the lower end of the cooling water jacket, the combustion chamber surrounded by the cooling water jacket can be more stably cooled, so that the cooling effect of the cooling water channel structure is ensured, and the compactness of the engine structure is improved while the cooling effect is ensured and improved.

[0009] In the engine cooling water channel structure, a side wall of the cooling water jacket is concave to form a concave notch, a water baffle is vertically fixed in the concave notch, one side of the water baffle and a side wall of the concave notch form the water guide channel, the cooling water jacket is located on the other side of the water baffle, and an under edge of the water baffle and a bottom wall of the concave notch form a flow space for communication between the water guide channel and the cooling water jacket.

[0010] The concave notch is arranged, one side of the water baffle and a side wall of the concave notch form the water guide channel, the cooling water entering the concave notch is guided, the cooling water jacket is located on the other side of the water baffle, the cooling water flows into the flow space from the water guide channel and then flows into the cooling water jacket, the water baffle plays a role of blocking and guiding flow, and the cooling effect of the cooling water on the combustion chamber surrounded by the cooling water jacket is further ensured, and the cylinder body is more convenient to form through the split design, and the production cost of the cooling water channel structure is reduced.

[0011] In the engine cooling water channel structure, two side walls of the concave notch are vertically provided with insertion grooves, the water baffle is inserted into the insertion grooves, and the vertical length of the water baffle is smaller than the vertical groove depth of the insertion grooves.

[0012] By opening the slot on the side wall of the cooling water jacket, the baffle plate is inserted into the slot, and because the vertical length of the baffle plate is less than the vertical slot depth of the slot, the baffle plate is easier to insert into the slot during assembly, and the position of the baffle plate in the slot can be adjusted according to different parameter values required by the engine during assembly, thereby adjusting the flow of cooling water entering the cooling water jacket, and adjusting the cooling efficiency of the engine.

[0013] In the above-mentioned engine cooling water path structure, the two edges of the baffle plate are connected by a flat plate-shaped connecting portion, and the two connecting portions are respectively inserted into the corresponding slots, and the upper end of the baffle plate is close to the outlet edge of the lower water channel.

[0014] The setting of the two edges of the baffle plate enables the baffle plate to be stably arranged in the slot and stably supported by the connecting portion when impacted by the cooling water. The upper end of the baffle plate is close to the outlet edge of the lower water channel, so that the baffle plate can quickly guide the cooling water without affecting the inflow of the cooling water in the lower water channel, and the baffle plate can also quickly guide the cooling water after the cooling water hits the baffle plate and falls into the water channel, thereby improving the flow guiding effect of the baffle plate.

[0015] In the above-mentioned engine cooling water path structure, the vertical length of the baffle plate is greater than or equal to half the vertical depth of the recess.

[0016] Through the design of the height of the baffle plate, the baffle plate can not only guide the flow but also ensure sufficient flow space, thereby reducing the impact of the cooling water on the baffle plate and further improving the flow guiding effect of the baffle plate.

[0017] In the above-mentioned engine cooling water path structure, the bottom wall of the recess has an inclined flow guide surface, the flow guide surface is located directly below the outlet of the lower water channel, and the flow guide surface is inclined towards the cooling water jacket from top to bottom.

[0018] The flow guide surface is inclined towards the cooling water jacket from top to bottom, and when the cooling water hits the flow guide surface, the flow guide surface can guide the cooling water to flow towards the cooling water jacket, thereby improving the flow efficiency of the cooling water and improving the cooling effect.

[0019] In the above-mentioned engine cooling water path structure, the upper side of the flow guide surface is connected with the side wall of the recess.

[0020] Through the structure, after the cooling water enters the recess, it can only collide with the side wall of the recess or the flow guide surface, and finally falls on the flow guide surface, ensuring that all the cooling water entering the recess is guided, and further improving the cooling effect.

[0021] In the cooling water path structure of the engine described above, the lower end surface of the water baffle is a limiting surface that is inclined from bottom to top toward the guide surface.

[0022] The limiting surface can guide the cooling water flowing down the water baffle to the direction of the cooling water path, and part of the cooling water splashes and hits the limiting surface. The limiting surface and the guide surface cooperate with each other to enable the water to buffer between the water baffle and the guide surface and flow into the cooling water path, further improving the buffering stability of the cooling water path structure.

[0023] In the cooling water path structure of the engine described above, the outer side wall of the cylinder body is outwardly protruding to form a mounting protrusion, and one of the insertion slots is formed in the mounting protrusion.

[0024] By forming the mounting protrusion on the outer side wall of the cylinder body, the insertion slot does not affect the cooling water flow area of the accommodation recess, and does not greatly affect the overall volume of the engine. The assembly stability is met, and the cooling efficiency of the cooling water path structure is ensured.

[0025] In the cooling water path structure of the engine described above, the cooling jacket includes two annular and oppositely arranged surrounding walls, and the surrounding wall on the outer side of the cooling jacket is tangent to the side wall on one side of the accommodation recess.

[0026] By designing the side wall on one side of the accommodation recess to be tangent to the surrounding wall on the outer side of the cooling jacket, the cooling water can flow circumferentially after entering the cooling jacket, thereby saving the kinetic energy of the cooling water flow, enabling the cooling water to have more sufficient kinetic energy to rotate around the cooling water path, and further improving the cooling effect.

[0027] Compared with the prior art, the cooling water path structure of the engine has the following advantages:

[0028] 1. The cooling water flows vertically into the water guide channel, and the lower end of the water guide channel is in communication with the bottom of the cooling jacket. The cooling water flows into the cooling jacket from the bottom of the cooling jacket, so that the cooling water gradually rises from the lower end of the cooling jacket. The combustion chamber surrounded by the cooling jacket can be more stably cooled, thereby ensuring the cooling effect of the cooling water path structure, and further improving the compactness of the engine structure while ensuring and improving the cooling effect.

[0029] 2. Since the length of the water baffle is less than the slot depth of the insertion slot, the water baffle is more easily inserted into the insertion slot during assembly. During assembly, the position of the water baffle in the insertion slot can be adjusted according to different parameter values required by the engine, thereby adjusting the flow of the cooling water entering the cooling jacket, and thereby adjusting the cooling efficiency of the engine.

[0030] 3. The guide surface is inclined from top to bottom towards the cooling water jacket. When the cooling water hits the guide surface, the guide surface can guide the cooling water and make the cooling water flow towards the cooling water jacket, thereby improving the cooling water flow efficiency and thus improving the cooling effect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a top view of the present invention.

[0033] Figure 3 yes Figure 2 Sectional view of AA.

[0034] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0035] Figure 5 yes Figure 2 A cross-sectional view of BB.

[0036] Figure 6 This is a schematic diagram of the structure of the baffle plate assembled on the cylinder body in this invention.

[0037] Figure 7 This is a top view of the baffle plate assembled on the cylinder body in this invention.

[0038] Figure 8 yes Figure 7 A sectional view of CC.

[0039] Figure 9 yes Figure 7 A sectional view of DD.

[0040] Figure 10 This is a schematic diagram of the water baffle plate in this invention.

[0041] Figure 11 This is a schematic diagram of the cylinder block in this invention.

[0042] Figure 12 This is a schematic diagram of the cylinder head structure in this invention.

[0043] In the diagram, 1. Cylinder block; 11. Cooling water jacket; 11a. Surrounding wall; 12. Slot; 13. Mounting protrusion; 14. Combustion chamber; 15. Water intake channel; 16. Relief notch; 16a. Guide surface; 2. Cylinder head; 21. Downflow channel; 21a. Outlet; 21b. Inlet; 22. Water outlet channel; 22a. Water outlet channel; 23. Water inlet; 3. Cooling water pump; 31. Water outlet; 4. Baffle plate; 41. Connecting part; 42. Limiting surface; 5. Flow space. Detailed Implementation

[0044] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0045] like Figures 1-6 As shown, the cooling water circuit structure of this engine includes a cylinder block 1 and a cylinder head 2 connected above the cylinder block 1. The cylinder block 1 has a combustion chamber 14 and a cooling water jacket 11 surrounding the combustion chamber 14. A cooling water pump 3 is connected to the cylinder head 2, and a water outlet channel 22 communicating with the cooling water jacket 11 is provided on the cylinder head 2.

[0046] Specifically, such as Figures 1-12 As shown, this cooling water circuit structure also includes a downflow channel 21 located inside the cylinder head 2 and connected to the outlet 31 of the cooling water pump 3. The downflow channel 21 is inclined downwards, and one side wall of the downflow channel 21 protrudes towards the inside of the cylinder head 2. The side wall of the cooling water jacket 11 is recessed to form a relief recess 16. A baffle plate 4 is vertically fixed inside the relief recess 16. One side of the baffle plate 4 and the side wall of the relief recess 16 enclose a water intake channel 15. The outlet 21a of the downflow channel 21 is vertically connected to the water intake channel 15. The lower end of the water intake channel 15 is connected to the bottom of the cooling water jacket 11. The cooling water jacket 11 is located on the other side of the baffle plate 4. The lower edge of the baffle plate 4 and the bottom wall of the relief recess 16 form a flow space 5 that connects the water intake channel 15 and the cooling water jacket 11.

[0047] The cooling water pump 3 is connected to the cylinder head 2. A water drain channel 21 is provided inside the cylinder head 2. By providing this internal drain channel 21, an external drain pipe is unnecessary, resulting in a more compact overall engine structure. To minimize the impact of the drain channel 21 on the cylinder head 2's volume, and to ensure the cooling water within the drain channel 21 effectively cools the cylinder head 2, further preventing wasted cooling capacity, the cooling water pump 3 operates, drawing cooling water from the outlet 31 into the inlet 21b of the drain channel 21. The cooling water flows through the drain channel 21 and out from the outlet 21a, entering the water intake channel 15. This further reduces the overall volume of the cylinder head 2. The water inlet channel 21 is vertically oriented, allowing its outlet 21a to connect vertically to the water inlet channel 15. The water inlet channel 15 is formed by one side of the baffle plate 4 and the side wall of the clearance recess 16. The cooling water jacket 11 is located on the other side of the baffle plate 4. Therefore, under the guidance of the baffle plate 4, the cooling water flows from the water inlet channel 15 through the flow space 5 to the bottom of the cooling water jacket 11. This ensures that the cooling water gradually rises from the lower end of the cooling water jacket 11, providing more stable cooling to the combustion chamber 14 surrounded by the cooling water jacket 11. This guarantees the cooling effect of the cooling water circuit structure and, consequently, improves the compactness of the engine structure while ensuring and enhancing the cooling effect.

[0048] Specifically, as shown in Figures 7-11 the two side walls of the recess 16 are provided with slots 12 in vertical direction, the baffle 4 is inserted into the slots 12, the vertical length of the baffle 4 is less than the vertical depth of the slots 12, the two edges of the baffle 4 are the connecting portions 41 in flat plate shape, the two connecting portions 41 are respectively inserted into the corresponding slots 12, the middle portion of the baffle 4 is curved towards the cooling jacket 11, the upper end of the baffle 4 is close to the outlet edge of the water passage 22, and the vertical length of the baffle 4 is greater than or equal to half of the vertical depth of the recess 16.

[0049] As shown in Figures 6-11 the bottom wall of the recess 16 is provided with a flow guide surface 16a in inclined manner, the flow guide surface 16a is located directly below the outlet 21a of the water passage 21, the flow guide surface 16a is gradually inclined towards the cooling jacket 11 from top to bottom, the upper side of the flow guide surface 16a is connected with the side wall of the recess 16, the lower end surface of the baffle 4 is the limiting surface 42 inclined towards the flow guide surface 16a from bottom to top, the outer side wall of the cylinder body 1 is outwardly protruded to form the mounting protrusion 13, and one of the slots 12 is partially formed on the mounting protrusion 13.

[0050] As shown in Figure 6 and Figure 7 the cooling jacket 11 includes two annular and oppositely arranged surrounding walls 11a, the surrounding wall 11a located outside is connected with the side wall of one side of the recess 16, and the surrounding wall 11a is tangent to the side wall of one side of the recess 16.

[0051] As shown in Figure 5 and Figure 12 the cylinder head 2 is provided with a plurality of water passing openings 23, the water passing openings 23 are communicated with the cooling jacket 11, the plurality of water passing openings 23 are distributed along the circumferential direction of the cooling jacket 11, and all the water passing openings 23 are communicated with the water outlet flow channel 22, the water outlet flow channel 22 includes an annular water outlet passage communicated with all the water passing openings 23, and the water outlet passage is located directly above the cooling jacket 11.

[0052] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art to which the present application pertains can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. An engine cooling water passage structure, the engine including a cylinder block (1) and a cylinder head (2) connected above the cylinder block (1), a combustion chamber (14) and a cooling water jacket (11) surrounding the combustion chamber (14) being formed in the cylinder block (1), characterized in that, The cooling water path structure further comprises a water outlet channel (21) formed in the cylinder head (2) and capable of communicating with the water outlet (31) of the cooling water pump (3), the cylinder body (1) has a water inlet channel (15) penetrating the upper end face, the outlet (21a) of the water outlet channel (21) vertically communicates with the water inlet channel (15), the lower end of the water inlet channel (15) communicates with the bottom of the cooling water jacket (11), the side wall of the cooling water jacket (11) is concave to form a clearance notch (16), the clearance notch (16) vertically fixes the water baffle (4), one side of the water baffle (4) and the side wall of the clearance notch (16) jointly form the water inlet channel (15), the cooling water jacket (11) is located on the other side of the water baffle (4), and the lower edge of the water baffle (4) and the bottom wall of the clearance notch (16) form a flow space (5) for communicating the water inlet channel (15) with the cooling water jacket (11).

2. The engine cooling water passage structure according to claim 1, characterized by The side walls of the clearance notch (16) are vertically provided with insertion grooves (12), the water baffle (4) is inserted into the insertion grooves (12), and the vertical length of the water baffle (4) is less than the vertical groove depth of the insertion grooves (12).

3. The engine cooling water passage structure according to claim 2, characterized by The two edges of the water baffle (4) are the plate-shaped connecting portions (41), the two connecting portions (41) are respectively inserted into the corresponding insertion grooves (12), and the upper end of the water baffle (4) is close to the outlet edge of the water outlet channel (22).

4. The engine cooling water passage structure according to claim 2 or 3, characterized in that, The vertical length of the water baffle (4) is greater than or equal to half of the vertical depth of the clearance notch (16).

5. The engine cooling water passage structure according to claim 2 or 3, characterized in that, The bottom wall of the clearance notch (16) has an inclined flow guide surface (16a), the flow guide surface (16a) is located directly below the outlet (21a) of the water outlet channel (21), and the flow guide surface (16a) is gradually inclined to the cooling water jacket (11) from top to bottom.

6. The engine cooling water passage structure according to claim 5, characterized by The upper side of the flow guide surface (16a) is connected with the side wall of the clearance notch (16).

7. The engine cooling water passage structure according to claim 5, characterized by The lower end face of the water baffle (4) is the limiting face (42) inclined to the flow guide surface (16a) from bottom to top.

8. The engine cooling water passage structure according to claim 2 or 3, characterized by The outer side wall of the cylinder body (1) is outwardly protruding to form a mounting protrusion (13), and one of the insertion grooves (12) is partially formed on the mounting protrusion (13).

9. The engine cooling water passage structure according to claim 2 or 3, characterized by The cooling water jacket (11) comprises two annular and oppositely arranged surrounding walls (11a), the surrounding wall (11a) located on the outer side is connected with the side wall of one side of the clearance notch (16) and is tangent to the side wall of one side of the clearance notch (16).

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