Motorcycle water-cooled engine

Abstract

The present invention discloses a water-cooled engine for motorcycles, comprising an engine body and a water cooling system, wherein the engine body comprises an engine casing, a cylinder block and a cylinder head, and the water cooling system comprises a water pump groove arranged on the engine casing at a position corresponding to a rotating shaft, a water pump cover for sealing the water pump groove, an impeller located in the water pump groove and wound around a balance shaft, a total water inlet communicated with the water pump groove, a cooling water pipe communicated with the water pump groove, a first water channel arranged in the cylinder block and communicated with the cooling water pipe, and a second water channel arranged in the cylinder head and communicated with the first water channel, wherein the cylinder head is provided with a total water outlet communicated with the second water channel. The present invention arranges a water pump groove on the engine casing, and arranges a water inlet on the cylinder block, and arranges a slow flow channel in the cylinder head, so that the cooling water in the cylinder block can be quickly discharged, thereby improving the heat exchange efficiency of the cylinder block, and having a simple and compact structure.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle manufacturing, in particular to a water-cooled engine for a motorcycle. Background Art

[0002] At present, water-cooled engines generally press cooling water into an annular flow channel arranged in the cylinder head from the water inlet on the side wall of the cylinder head, and the cooling water is diverted to the cylinder body at the lower end at the inlet of the annular flow channel. After the diverted cooling water cools the cylinder body, it flows back into the cylinder head at a position close to the water outlet on the other side, and finally flows out through the water outlet. In this process, the position where the cooling water flows back from the cylinder body to the cylinder head needs to be restricted by the water pressure in the cylinder head, and close to the water outlet, the confluence flow is large, the resistance to discharging the cooling water is large, and the cooling water in the cylinder body is not discharged smoothly, resulting in low heat exchange efficiency and poor cylinder cooling effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a motorcycle water-cooled engine which can improve the cylinder cooling efficiency.

[0004] The technical solution of the present invention is as follows:

[0005] A motorcycle water-cooled engine comprises an engine body and a water cooling system, wherein the engine body comprises an engine housing, a cylinder block and a cylinder head, wherein the water cooling system comprises a water pump groove arranged on the engine housing at a position corresponding to a rotating shaft, a water pump cover for sealing the water pump groove, a total water inlet located in the water pump groove and connected to the water pump groove by an impeller arranged around the rotating shaft, a cooling water pipe connected to the water pump groove, a first water channel arranged in the cylinder block and connected to the cooling water pipe, and a second water channel arranged in the cylinder head and connected to the first water channel, wherein the water pump groove extends inward from a position at one end of the engine housing corresponding to the rotating shaft to a position at which the water pump groove extends inward. The water pump groove is formed by a concave arrangement, a through hole is provided at the bottom of the water pump groove, a bearing assembly is embedded in the through hole, the end of the rotating shaft passes through the bearing assembly to be located in the water pump groove, and the impeller is arranged on the end to generate kinetic energy as the rotating shaft rotates; the bottom of the water pump groove has a first step surface with a spiral shape arranged around the through hole and a deep groove connected to the first step surface, and the depression depth of the deep groove is greater than the depression depth of the first step surface; the engine casing is formed with a water outlet connected to the water inlet end of the cooling water pipe at a position corresponding to the bottom of the deep groove, and the cylinder head is provided with a total water outlet connected to the second water channel.

[0006] With the above structure, the impeller drives the cooling water in the water pump groove to turn over, and guides the cooling water into the water inlet pipe along the water pump cover and enters the first water channel in the cylinder body. After the cooling water enters the cylinder head upward, a part of it is quickly discharged to the main water outlet through the second water channel, which is conducive to the rapid discharge of the cooling water in the cylinder body, and the other part flows to the slow flow channel through the second water channel and then flows to the main water outlet for convergence. The second water channel increases the cooling water's stroke and prolongs the cooling cycle of the cooling water in the cylinder head. Some of the cooling water flows out later than the cooling water directly diverted to the main water outlet, and then in The water inlet direction of the total water outlet forms a stable pressure diversion, and most of the cooling water in the cylinder body will flow into the total water outlet position before the cooling water in the cylinder head, thereby improving the heat exchange efficiency of the cylinder body; when the water channels are full of cooling water, since the cooling water discharge power is in the cylinder body, the cooling water in the cylinder body can break through the resistance of the cooling water in the cylinder head and be discharged to the total water outlet first, while the cooling distance of the cooling water in the second water channel is extended, and the cooling water in the cylinder body is discharged more smoothly, which also improves the heat exchange efficiency of the cylinder head and the cooling effect of the cylinder body and cylinder head.

[0007] In order to simplify the structure and facilitate installation, preferably, the water pump groove is formed by being recessed inward from the engine casing at one end corresponding to the rotating shaft, a through hole is provided at the bottom of the water pump groove, a bearing assembly is embedded in the through hole, the end of the rotating shaft passes through the bearing assembly to be located in the water pump groove; the impeller is arranged on the end to generate kinetic energy as the rotating shaft rotates.

[0008] In order to simplify the water pump cover structure and facilitate drainage, preferably, the water pump cover forms a second step surface at a position corresponding to the first step surface, and the first step surface and the second step surface combine to form a spiral boost diversion channel; a total water inlet is provided on the water pump cover, and the total water inlet is connected to the boost diversion channel.

[0009] In order to speed up the flow of cooling water at the bottom of the first water channel, preferably, a water inlet is provided on the side wall of the cylinder body close to the total water outlet, and the outlet end of the cooling water pipe penetrates into the water inlet to be connected with the first water channel. In the horizontal plane projection, the water inlet and the total water outlet are used as the boundary, and the shorter arc section between the water inlet and the total water outlet on the second water channel is the first water flow section, and the longer arc section between the water inlet and the total water outlet on the second water channel is the second water flow section; at least a part of the second water flow section is a slow flow section, and the bottom surface of the slow flow section is higher than the bottom surface of the second water flow section.

[0010] In order to simplify the structure, preferably, the first water channel is an annular water channel arranged around the cylinder body, the side wall of the cylinder body forms an annular outer wall of the annular water channel, an annular inner wall is formed inside the side wall of the cylinder body, and the bottoms of the annular inner wall and the annular outer wall are sealed to form the bottom wall of the annular water channel.

[0011] In order to ensure the cooling efficiency of the cylinder body, preferably, the height of the first water channel is matched with the height of the cylinder body.

[0012] In order to ensure the rapid flow of cooling water and improve the heat exchange efficiency, preferably, the second water channel is also annular in the horizontal projection plane and matches the shape of the first water channel, and the lower end of the second water channel is provided with a plurality of connecting holes connected to the first water channel.

[0013] In order to simplify the structure, preferably, the slow flow section is a circuitous structure in horizontal plane projection, and two ends of the circuitous structure are respectively connected to corresponding positions of the second water flow section.

[0014] In order to enable the cooling water to undergo sufficient heat exchange, preferably, the water cooling system also includes a transition section formed between the second water channel and the total water outlet, one end of the transition section is connected to the junction of the first water flow section and the second water flow section, and the other end of the transition section is connected to the total water outlet, and the transition section presents a "Z"-shaped structure with a low inside and a high outside in the vertical direction.

[0015] Beneficial effects: The present invention arranges a water pump groove on the engine casing, a water inlet on the cylinder body, and a slow flow channel in the cylinder head, which can quickly discharge the cooling water in the cylinder body, improve the heat exchange efficiency of the cylinder body, and has a simple and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 This is an exploded view of the installation structure of the water pump cover and the water pump tank.

[0018] Figure 3 It is a structural schematic diagram of the cylinder head and the connecting hole.

[0019] Figure 4 This is a schematic diagram of the structure of the second waterway and the slow-flow section.

[0020] Figure 5 It is a schematic diagram of the structure of the water pump groove and the waterway core. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Depend on Figure 1, Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the present invention includes an engine body and a water cooling system. The engine body includes an engine housing, a cylinder block 2 and a cylinder head 3. The engine housing is provided with a total water inlet 123, and the cylinder head 3 is provided with a total water outlet 33. One end of the water cooling system is connected to the total water inlet 123, and the other end is connected to the total water outlet 33. Cooling water (external water source, coolant, etc.) enters the water cooling system through the cylinder block 2 and the cylinder head 3, and flows out from the total water outlet 33.

[0023] The water cooling system includes a water pump tank 1 provided on the engine housing at a position corresponding to one of the rotating shafts (any fast-rotating rotating shaft in the crankcase that can increase water pressure, such as a crankshaft, a camshaft, and a balance shaft, etc., and this embodiment is described in detail by taking the balance shaft as an example), a water pump cover 12 for sealing the water pump tank 1, an impeller 4 located in the water pump tank 1 and wound around the balance shaft, a total water inlet 123 communicating with the water pump tank 1, a cooling water pipe 11 communicating with the water pump tank 1, a first water channel 21 provided in the cylinder body 2 and communicating with the cooling water pipe 11, and a second water channel 31 provided in the cylinder head 3 and communicating with the first water channel 21. A water inlet is provided on the side wall of the cylinder body 2, and the water outlet end of the cooling water pipe 11 penetrates the water inlet to communicate with the first water channel 21.

[0024] In this embodiment, the water pump groove 1 is formed by the inward concave setting of the engine housing, that is, the part of the engine housing corresponding to the balance shaft is concave inward to form the concave water pump groove 1, and a water outlet is formed at a position corresponding to the water pump groove 1 on the engine housing, and the cooling water pipe 11 is connected to the water pump groove 1 through the water outlet. Such a setting can reduce the difficulty of setting the water pump groove 1, and it can be completed through an integrated process without the need to add additional split parts, thereby increasing the consistency, integrity and integrity of the engine housing, reducing the process difficulty and saving costs. The bottom of the water pump groove 1 is provided with a through hole, and a bearing assembly is embedded in the through hole. The end of the balance shaft passes through the bearing assembly to be located in the water pump groove 1; the impeller 4 is arranged on the end to generate kinetic energy as the balance shaft rotates. With such a configuration, through a simple and clever design idea, it is only necessary to change the shape of the engine casing, so that the engine casing forms a water pump groove 1, and the end of the balance shaft is located in the water pump groove 1, and the impeller 4 is sleeved on the end located in the water pump groove 1, so that the impeller 4 can be driven to rotate by the rotation of the balance shaft, thereby generating water pump kinetic energy. There is no need to purchase an additional water pump, and the original structure can be used to meet the needs through a simple assembly design, which further reduces the procurement cost, manufacturing cost, and assembly cost, improves the assembly efficiency, and has extremely high practicality.

[0025] Preferably, the bottom of the water pump groove 1 has a spiral first step surface 122 around the perforation and a deep groove connected to the first step surface 122, and the depression depth of the deep groove is greater than the depression depth of the first step surface 122; the water outlet is formed at a position of the engine housing corresponding to the bottom of the deep groove. Correspondingly, the water pump cover 12 forms a second step surface 121 at a position corresponding to the first step surface 122, and the first step surface 122 and the second step surface 121 are combined to form a vortex-shaped boost diversion channel, and the water pump cover 12 is provided with the total water inlet 123, and the total water inlet 123 is connected to the boost diversion channel.

[0026] The height of the first water channel 21 is adapted to the height of the cylinder body 2. The first water channel 21 is an annular water channel arranged around the cylinder body 2. The side wall of the cylinder body 2 forms an annular outer wall of the annular water channel. An annular inner wall is formed inside the side wall of the cylinder body 2. The bottoms of the annular inner wall and the annular outer wall are sealed to form the bottom wall of the annular water channel. The annular inner wall and the top of the annular outer wall are sealed to form the top wall of the annular water channel. A plurality of water outlet holes are provided on the top wall.

[0027] In this embodiment, the water inlet is arranged on the side wall of the cylinder body 2 at a position close to the total water outlet 33. The second water channel 31 is also annular in shape on the horizontal projection plane and matches the shape of the first water channel 21. The second water channel 31 is provided with a plurality of connecting holes 34 connected thereto at the position corresponding to the water outlet. On the horizontal plane projection, the water inlet and the total water outlet are used as the boundary. The shorter arc section between the water inlet and the total water outlet 33 on the second water channel 31 is the first water flow section 311, and the longer arc section between the water inlet and the total water outlet 33 on the second water channel 31 is the second water flow section 312. At least a portion of the second water flow section 312 (the at least a portion refers to at least a section of the second water flow section 312, and at most the entire section of the second water flow section) is a slow flow section 32, and the bottom surface of the slow flow section 32 is higher than the bottom surface of the first water flow section 311. The slow flow section 32 is a circuitous structure in horizontal plane projection, specifically a "V"-shaped structure in this embodiment, and both ends of the "V"-shaped structure are respectively connected to corresponding positions of the second water flow section 312. The circuitous shape includes but is not limited to a "V" shape, a "W" shape, an "S" shape, a wave shape, a snake shape, etc. in horizontal plane projection.

[0028] In the present embodiment, preferably, a transition section 35 is provided between the second water channel 31 and the total water outlet 33, one end of the transition section 35 is connected to the junction of the first water flow section 311 and the second water flow section 312, and the other end of the transition section 35 is connected to the total water outlet 33, and the transition section 35 presents a "Z"-shaped structure with a low inside and a high outside in the vertical direction.

[0029] The method of use of the present invention is as follows:

[0030] like Figure 1 and Figure 2 As shown, the balancing shaft extends from the position of the engine casing corresponding to the water pump groove 1, the protruding end of the balancing shaft is sleeved with the impeller 4, and then the water pump cover 12 is buckled at the position of the water pump groove 1 to form a water pump structure, and the cooling water flows from the water tank into the water pump groove 1 through the main water inlet 123. The balancing shaft drives the impeller 4 to rotate, drives the cooling water in the water pump groove 1 to turn over, and guides the cooling water along the water pump cover 12 to the position of the second step surface 121, and after passing through the cooling water pipe 11, it enters the first water channel 21 in the cylinder body 2.

[0031] like Figure 3 , Figure 4 and Figure 5As shown, eight connecting holes 34 are evenly arranged along the annular first water channel 21 (the specific number can be determined according to the requirements of different embodiments). A part of the connecting holes 34 is quickly discharged to the position of the total water outlet 33 through the first water flow section 311 of the second water channel 31, which is conducive to the rapid discharge of cooling water in the cylinder body 2. The other part flows to the slow flow section 32 through the second water flow channel 312, accumulates, and then gradually flows to the position 33 of the total water outlet 33 for discharge. Among them, the plane where the bottom of the slow flow section 32 is located is higher than the plane where the bottom of the second water channel 31 is located, that is, the water level of the slow flow section 32 is higher than the water level of the second water channel 31, and the cooling water in the cylinder body 2 is discharged quickly. Before the water flows into the slow flow section 32, it has a process of rising and accumulating water. When it flows from the slow flow section 32 through the second water channel 31 to the total water outlet 33, the water level drops and the flow rate increases to form a certain potential energy. The slow flow section 32 increases the travel of the cooling water and extends the cooling cycle of the cooling water in the cylinder head 3. This part of the cooling water flows out later than the cooling water directly diverted to the total water outlet 33, thereby forming a stable pressure diversion in the water inlet direction of the total water outlet 33. Most of the cooling water in the cylinder body 2 flows into the total water outlet 33 before the cooling water in the cylinder head 3, thereby improving the heat exchange efficiency of the cylinder body.

[0032] In this process, since a transition section 35 is provided between the second water channel 31 and the main water outlet 33, the transition section 35 is in a "Z" shape with a low inside and a high outside in the vertical direction, which will also form a process of cooling water accumulation from low to high, and also increase the cooling water's cycle of absorbing heat in the cylinder head 3, and also improve the heat exchange efficiency of the cylinder head 3.

[0033] When the three water channels are filled with cooling water, the cooling water flow order in the cylinder body 2 and the cylinder head 3 has been generated, the cooling water in the cylinder body 2 is discharged more smoothly, and most of the cooling water in the cylinder body 2 is always discharged first.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A water-cooled motorcycle engine, comprising an engine body and a water cooling system, wherein the engine body comprises an engine housing, a cylinder block (2) and a cylinder head (3), and is characterized in that: The water cooling system comprises a water pump groove (1) provided on the engine housing at a position corresponding to the rotating shaft, a water pump cover (12) for sealing the water pump groove (1), an impeller (4) located in the water pump groove (1) and arranged around the rotating shaft, a total water inlet (123) communicating with the water pump groove (1), a cooling water pipe (11) communicating with the water pump groove (1), a first water channel (21) provided in the cylinder body (2) and communicating with the cooling water pipe (11), and a second water channel (31) provided in the cylinder head (3) and communicating with the first water channel (21), wherein the water pump groove (1) is formed by being recessed inwardly from a position at one end of the engine housing corresponding to the rotating shaft, and the groove of the water pump groove (1) A through hole is provided at the bottom, a bearing assembly is embedded in the through hole, the end of the rotating shaft passes through the bearing assembly to be located in the water pump groove (1), and the impeller (4) is arranged around the end to generate kinetic energy as the rotating shaft rotates; the bottom of the water pump groove (1) has a first step surface (122) with a spiral shape arranged around the through hole and a deep groove connected to the first step surface (122), the depression depth of the deep groove is greater than the depression depth of the first step surface (122); the engine casing is formed with a water outlet connected to the water inlet end of the cooling water pipe (11) at a position corresponding to the bottom of the deep groove, and the cylinder head (3) is provided with a total water outlet (33) connected to the second water channel (31).

2. The water-cooled motorcycle engine according to claim 1, characterized in that: The water pump cover (12) forms a second step surface (121) at a position corresponding to the first step surface (122), and the first step surface (122) and the second step surface (121) are combined to form a vortex-shaped pressurization guide channel; a total water inlet (123) is provided on the water pump cover (12), and the total water inlet (123) is connected to the pressurization guide channel.

3. The water-cooled motorcycle engine according to any one of claims 1 to 2, characterized in that: A water inlet is provided on a side of the side wall of the cylinder body (2) near the total water outlet (33), and the water outlet end of the cooling water pipe (11) penetrates the water inlet to communicate with the first water channel (21); in horizontal plane projection, the water inlet and the total water outlet are used as a boundary, and a shorter arc section of the second water channel (31) located between the water inlet and the total water outlet (33) is a first water flow section (311), and a longer arc section of the second water channel (31) located between the water inlet and the total water outlet (33) is a second water flow section (312); at least a part of the second water flow section (312) is a slow flow section (32), and the bottom surface of the slow flow section (32) is higher than the bottom surface of the second water flow section (312).

4. The water-cooled motorcycle engine according to claim 3, characterized in that: The first water channel (21) is an annular water channel arranged around the cylinder body (2), the side wall of the cylinder body (2) forming an annular outer side wall of the annular water channel, an annular inner side wall being formed inside the side wall of the cylinder body (2), the bottoms of the annular inner side wall and the annular outer side wall being sealed to form a bottom wall of the annular water channel.

5. The water-cooled motorcycle engine according to claim 4, characterized in that: The height of the first water channel (21) matches the height of the cylinder body (2).

6. The water-cooled motorcycle engine according to claim 1, characterized in that: The second water channel (31) is also annular in shape on a horizontal projection plane and matches the shape of the first water channel (21). The lower end of the second water channel (31) is provided with a plurality of connection holes (34) that communicate with the first water channel (21).

7. The water-cooled motorcycle engine according to claim 3, characterized in that: The slow flow section (32) is a meandering structure when projected on a horizontal plane, and both ends of the meandering structure are respectively connected to corresponding positions of the second water flow section (312).

8. The water-cooled motorcycle engine according to claim 3, characterized in that: The water cooling system further comprises a transition section (35) formed between the second water channel (31) and the main water outlet (33), one end of the transition section (35) being in communication with the junction of the first water flow section (311) and the second water flow section (312), and the other end of the transition section (35) being in communication with the main water outlet 33, the transition section (35) presenting a "Z"-shaped structure with a lower interior and a higher exterior in the vertical direction.

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