A water cooling system for motorcycle engine

Abstract

The present invention provides a water cooling system for a motorcycle engine, belonging to the technical field of engines. It solves the problem of poor cooling effect of existing motorcycle engines. The engine includes a cylinder body and an engine cooler fixedly connected to the cylinder body, the water cooling system includes a cooling pipe, a water pump fixedly connected to the cylinder body, and a cylinder water jacket, a water inlet water jacket and a water outlet water jacket located in the cylinder body, the water outlet pipe of the water pump is respectively connected to the engine cooler and the cylinder water jacket through the water inlet water jacket, the engine cooler and the cylinder water jacket are both connected to the water inlet pipe of the water pump through the water outlet water jacket, the end of the water outlet water jacket close to the cylinder water jacket is connected to the cooling pipe, the cooling pipe is connected to the water inlet pipe of the water pump, and a thermostat is provided at the connection between the water outlet water jacket and the cooling pipe. The water cooling system of the motorcycle engine has the advantage of good cooling effect.

Description

Technical Field

[0001] The invention belongs to the technical field of engines and relates to a water cooling system for a motorcycle engine. Background Art

[0002] The main function of the automobile engine cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature. The automobile engine cooling system uses water as the cooling medium, including a small circulation water cooling system and a large circulation water cooling system.

[0003] Existing motorcycle engine cooling systems, for example, Chinese patent literature discloses a fully enclosed internal circulation water cooling structure of a motorcycle water-cooled engine [application number: 201510368371.X; authorization announcement number: CN104948289A], which includes a cylinder body and a cylinder head. The cylinder body and the cylinder head are provided with interconnected cooling water channels. The cylinder head is provided with an upper half of a combustion chamber, and the cylinder body is provided with a lower half of a combustion chamber. The cooling water channels on the cylinder body and the cylinder head surround the combustion chamber. The joint surfaces of the cylinder body and the cylinder head are sealed by an annular sealing gasket. An annular groove is respectively provided on the joint surfaces of the cylinder body and the cylinder head. The annular groove on the cylinder body is located between the lower half of the combustion chamber and the cooling water channel on the cylinder body, and the annular groove on the cylinder head is located between the upper half of the combustion chamber and the cooling water channel on the cylinder head. It also includes two air bleed pipes, one end of each air bleed pipe is inserted into the annular groove, and the other end extends out of the motorcycle water-cooled engine to communicate with the external atmosphere.

[0004] In this type of internal circulation water cooling structure, cooling water circulates along the water pump, cooling water channel and water tank to achieve cooling. However, this type of internal circulation water cooling structure only cools the position of the cylinder combustion chamber, forming only one water cooling cycle, with limited circulation positions, limited cooling area, single function and poor cooling effect. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to propose a water cooling system for a motorcycle engine, so as to solve the technical problem of how to improve the cooling effect of the engine.

[0006] The object of the present invention can be achieved through the following technical solutions: a water cooling system for a motorcycle engine, the engine includes a cylinder body and an engine cooler fixedly connected to the cylinder body, the water cooling system includes a cooling pipe, a water pump fixedly connected to the cylinder body, and a cylinder water jacket, a water inlet water jacket and a water outlet water jacket located in the cylinder body, characterized in that the water outlet pipe of the water pump is respectively connected to the engine cooler and the cylinder water jacket through the water inlet water jacket, the engine cooler and the cylinder water jacket are both connected to the water inlet pipe of the water pump through the water outlet water jacket, the end of the water outlet water jacket close to the cylinder water jacket is connected to the cooling pipe, the cooling pipe is connected to the water inlet pipe of the water pump, and a thermostat is provided at the connection between the water outlet water jacket and the cooling pipe.

[0007] This water cooling system includes three cooling cycles, water cooling cycle 1: water pump, water inlet jacket, engine cooler, water outlet jacket and water pump; water cooling cycle 2: water pump, water inlet jacket, cylinder jacket, water outlet jacket and water pump; water cooling cycle 3: water pump, water inlet jacket, cylinder jacket, water outlet jacket, thermostat, cooling pipe and water pump. This water cooling system forms multiple water cooling cycles, the cooling water flows through a large range, and many parts are cooled. It not only cools the parts near the combustion chamber in the cylinder, but also cools the cylinder located at the bottom of the combustion chamber and the engine cooler, etc., to improve the cooling effect of the engine. A radiator or other auxiliary heat dissipation device can be set in the cooling pipe.

[0008] In the above-mentioned water cooling system of a motorcycle engine, the cylinder body has a plurality of cylinder holes, and the ends of the water inlet jacket and the water outlet jacket connected to the cylinder body water jacket are both located between two adjacent cylinder holes, and the cylinder body has an exhaust hole, and the ends of the water inlet jacket and the water outlet jacket connected to the cylinder body water jacket are both located at the exhaust hole. Reasonable use of space increases the cooling area and improves the cooling effect of the engine; the water inlet jacket and the water outlet jacket both extend to the exhaust hole to cool the exhaust hole, so that the temperature of each part of the cylinder body is as uniform as possible, and the cooling effect of the engine is improved.

[0009] In the above-mentioned water cooling system of a motorcycle engine, the water inlet jacket and the water outlet jacket are arranged adjacent to each other. This structure makes it convenient to arrange the water inlet jacket and the water outlet jacket and makes the structure of the cylinder body reasonable.

[0010] In the above-mentioned water cooling system of a motorcycle engine, the water inlet jacket includes a first water inlet section and a second water inlet section, one end of the first water inlet section is connected to the water outlet pipe of the water pump, the other end of the first water inlet section is connected to the second water inlet section, one end of the second water inlet section is connected to the water inlet of the cylinder water jacket, the other end of the second water inlet section is connected to the water inlet of the machine cooler, the first water inlet section is arranged horizontally in the middle of the cylinder, and the second water inlet section is arranged vertically in the middle of the cylinder. This structure makes the water inlet jacket layout reasonable, the water inlet jacket is located in the cylinder as a whole, the structure is compact, the space occupied is small, and the cost is low; at the same time, the cooling water is also undergoing heat exchange in the process of flowing through the water inlet jacket, thereby improving the cooling effect.

[0011] In the above-mentioned water cooling system of a motorcycle engine, the water outlet jacket includes a first water outlet section and a second water outlet section, one end of the first water outlet section is connected to the water inlet pipe of the water pump, the other end of the first water outlet section is connected to the second water outlet section, one end of the second water outlet section is connected to the water outlet of the cylinder water jacket, the other end of the second water outlet section is connected to the water outlet of the machine cooler, the first water outlet section is arranged horizontally in the middle of the cylinder, and the second water outlet section is arranged vertically in the middle of the cylinder. This structure makes the water outlet jacket layout reasonable, the water outlet jacket is located in the cylinder as a whole, the structure is compact, the space occupied is small, and the cost is low; at the same time, the cooling water is also undergoing heat exchange in the process of flowing through the water outlet jacket, thereby improving the cooling effect.

[0012] In the above-mentioned water cooling system of a motorcycle engine, the cylinder body includes a case body and a cylinder head, the cylinder body water jacket includes a case body water jacket, a cylinder head water jacket and a plurality of connecting water jackets, the case body water jacket is located in the case body, the cylinder head water jacket is located in the cylinder head, the connecting water jacket is located between the case body water jacket and the cylinder head water jacket, and the case body water jacket and the cylinder head water jacket are connected through the connecting water jackets arranged at intervals, the case body water jacket is flat ring-shaped, the water outlet of the water inlet water jacket is located in the middle of one side of the case body water jacket, and the water outlet water jacket is connected to the center of the cylinder head water jacket. The cooling water in the case water jacket enters the cylinder head water jacket through the connecting water jacket. The connecting water jacket is arranged so that when the cooling water in the case water jacket enters the cylinder head water jacket, the amount of cooling water at each edge of the cylinder head water jacket is as consistent as possible. The outlet water jacket is connected with the center of the cylinder head water jacket, so that the cooling water in the cylinder head water jacket flows from the edge toward the center and finally flows out from the outlet water jacket. The inlet water jacket is located in the middle of one side of the case water jacket, and the outlet water jacket is connected with the center of the cylinder head water jacket, so that the flow rate and flow direction of the cooling water are relatively symmetrical, the flow distance of the cooling water is short, the cooling water cools the cylinder block and the combustion chamber more evenly, the temperature difference between each part of the cylinder block and the combustion chamber is small, the cooling effect of the engine is improved, the engine is balanced and stable when working, and the performance of the engine is improved.

[0013] In the above-mentioned water cooling system of a motorcycle engine, the cylinder head water jacket includes an annular outer water jacket and an inner water jacket located inside the outer water jacket, the outer water jacket is partially arranged along the case water jacket and the outer water jacket is connected to the case water jacket through a connecting water jacket, and the center of the inner water jacket is connected to the water outlet water jacket. The case water jacket in the flat annular shape and the annular outer water jacket are designed to match the structure of the combustion chamber and play a role in better and uniformly cooling the combustion chamber; the structure of the cylinder head water jacket ensures that the cooling water flows from the edge to the center, making the cooling water flow as consistent as possible, making the cooling effect of the cooling water as uniform as possible, and improving the cooling effect of the engine.

[0014] In the above-mentioned water cooling system of a motorcycle engine, the case water jacket is arranged symmetrically with the center of the cylinder head water jacket as the center, the cylinder head water jacket is arranged symmetrically with the center of the cylinder head water jacket as the center, and all the connecting water jackets are arranged symmetrically with the center of the cylinder head water jacket as the center. The flow rate and flow direction of the cooling water in the case water jacket, the cylinder head water jacket and the connecting water jacket are as symmetrical as possible, which has a better cooling effect, reduces the temperature difference between various parts of the cylinder body and the combustion chamber, improves the cooling effect of the engine, makes the engine balanced and stable when working, and improves the performance of the engine.

[0015] In the above-mentioned water cooling system of a motorcycle engine, the housing water jacket includes a section of annular water jacket in an open ring shape, the outlet water jacket has an escape channel, the outlet water jacket is divided into two parts at the escape channel and the two separated parts are symmetrically arranged, and the escape channel is arranged opposite to the cavity inside the annular water jacket. The escape space is formed by the arrangement of the annular water jacket, and the escape channel is used in conjunction with the annular water jacket so that the shaft or other parts inside the engine can be inserted, the space is reasonably used, the various parts are reasonably arranged, and the engine structure is compact.

[0016] In the above-mentioned water cooling system of a motorcycle engine, the sum of the depths of the cylinder head water jacket, the connecting water jacket and the case water jacket is between 30-50 mm, and the depth of the case water jacket is greater than the depth of the cylinder head water jacket. In this structure, the cylinder water jacket has a lower depth, which is conducive to idling warm-up and discharge; at the same time, it can better guide the flow of cooling water and improve the cooling effect of the engine.

[0017] In the above-mentioned water cooling system of a motorcycle engine, a balance shaft is provided in the cylinder body, the balance shaft is connected to a water pump and the balance shaft can drive the water pump to rotate. The water pump works to realize the circulation of cooling water, and the water pump is directly driven to work by the balance shaft inside the engine, with high transmission efficiency and reliable stability.

[0018] Compared with the prior art, the water cooling system of a motorcycle engine provided by the present invention has the following advantages:

[0019] 1. This water cooling system forms multiple water cooling cycles. The cooling water flows through a large range and cools many parts. It not only cools the parts near the combustion chamber in the cylinder, but also cools the cylinder and the engine cooler located below the combustion chamber, thereby improving the cooling effect of the engine.

[0020] 2. The flow rate and direction of the cooling water in the water jacket of the cylinder block of this water-cooling system are relatively symmetrical, and the cooling effect of the cooling water on each part of each cylinder hole is relatively consistent, so that the temperature difference at each cylinder hole is small, the cooling of the combustion chamber is good, the cooling effect of the engine is improved, the engine is balanced and stable when working, and the performance of the engine is improved.

[0021] 3. The water cooling system makes reasonable use of space when arranged, occupies a small space and has a compact structure; at the same time, the depth of the water jacket is shallow, which is conducive to idling warm-up and discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the overall structure diagram of the cooling water flow of the motorcycle engine water cooling system Figure 1 .

[0023] Figure 2 This is the overall structure diagram of the cooling water flow of the motorcycle engine water cooling system Figure 2 .

[0024] Figure 3 It is a structural schematic diagram of the engine cylinder block of this motorcycle.

[0025] Figure 4 It is a structural schematic diagram of the engine case and the case water jacket of the motorcycle.

[0026] Figure 5 It is a structural schematic diagram of a cylinder head and a cylinder head water jacket of a motorcycle engine.

[0027] Figure 6 This motorcycle engine Figure 5 AA section view.

[0028] Figure 7 It is a schematic diagram of the water circulation of the water cooling system of the motorcycle engine.

[0029] In the figure, 1, cylinder block; 101, casing; 102, cylinder head; 2, engine cooler; 3, cooling pipe; 4, water pump; 5, cylinder water jacket; 51, casing water jacket; 511, annular water jacket; 52, cylinder head water jacket; 521, external water jacket; 522, internal water jacket; 53, connecting water jacket; 6, water inlet jacket; 61, first water inlet section; 62, second water inlet section; 7, water outlet jacket; 71, first water outlet section; 72, second water outlet section; 8, thermostat; 9, cylinder hole; 10, exhaust hole; 11, avoidance channel; 12, balance shaft. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] like Figure 1 , Figure 2 , Figure 3As shown, the engine includes a cylinder block 1, an engine cooler 2 fixedly connected to the cylinder block 1, and a balance shaft 12 located in the cylinder block 1. The water cooling system includes a cooling pipe 3, a water pump 4 fixedly connected to the cylinder block 1, and a cylinder water jacket 5, a water inlet water jacket 6, and a water outlet water jacket 7 located in the cylinder block 1. The balance shaft 12 is connected to the water pump 4 and the balance shaft 12 can drive the water pump 4 to rotate.

[0032] The cylinder block 1 includes a housing 101 and a cylinder head 102. The cylinder water jacket 5 includes a housing water jacket 51, a cylinder head water jacket 52 and a connecting water jacket 53. The housing water jacket 51 is located in the housing 101, the cylinder head water jacket 52 is located in the cylinder head 102, and the connecting water jacket 53 is located between the housing water jacket 51 and the cylinder head water jacket 52. The housing water jacket 51 and the cylinder head water jacket 52 are connected through the connecting water jacket 53 arranged at intervals. Figure 5 As shown, in this embodiment, the number of the communicating water jackets 53 is eleven. In actual production, the number of the communicating water jackets 53 may be eight or twenty. The box water jacket 51 is in a flat ring shape, and the water outlet of the water inlet water jacket 6 is located in the middle of one side of the box water jacket 51, as shown in FIG. Figure 6 As shown, the water outlet jacket 7 is connected to the center of the cylinder head water jacket 52.

[0033] The cylinder head water jacket 52 includes an annular outer water jacket 521 and an inner water jacket 522 located in the outer water jacket 521. The outer water jacket 521 is partially arranged along the case water jacket 51 and is connected to the case water jacket 51 through a connecting water jacket 53. The center of the inner water jacket 522 is connected to the outlet water jacket 7. The case water jacket 51 is arranged symmetrically with the center of the cylinder head water jacket 52 as the center, the cylinder head water jacket 52 is arranged symmetrically with the center of the cylinder head water jacket 52 as the center, and all the connecting water jackets 53 are arranged symmetrically with the center of the cylinder head water jacket 52 as the center.

[0034] like Figure 4 As shown, the tank water jacket 51 includes a section of annular water jacket 511 in an open ring shape, and the outlet water jacket 7 has an escape channel 11. The outlet water jacket 7 is divided into two parts at the escape channel 11, and the two separated parts are symmetrically arranged, and the escape channel 11 is arranged opposite to the cavity inside the annular water jacket 511. In this embodiment, the sum of the depths of the cylinder head water jacket 52, the connecting water jacket 53 and the tank water jacket 51 is 40 mm. In actual production, the sum of the depths of the cylinder head water jacket 52, the connecting water jacket 53 and the tank water jacket 51 can be 30 mm or 50 mm, and the depth of the tank water jacket 51 is greater than the depth of the cylinder head water jacket 52.

[0035] The water inlet water jacket 6 and the water outlet water jacket 7 are arranged adjacent to each other. In the present embodiment, the cylinder body 1 has two cylinder holes 9 and two exhaust holes 10. The ends of the water inlet water jacket 6 and the water outlet water jacket 7 connected to the cylinder body water jacket 5 are both located between two adjacent cylinder holes 9. The cylinder body 1 has an exhaust hole 10. The ends of the water inlet water jacket 6 and the water outlet water jacket 7 connected to the cylinder body water jacket 5 are both located at the exhaust hole 10. In actual production, the number of cylinder holes 9 and the exhaust holes 10 can be three or four.

[0036] Specifically, the water inlet jacket 6 includes a first water inlet section 61 and a second water inlet section 62, one end of the first water inlet section 61 is connected to the water outlet pipe of the water pump 4, the other end of the first water inlet section 61 is connected to the second water inlet section 62, one end of the second water inlet section 62 is connected to the water inlet of the box water jacket 51, the other end of the second water inlet section 62 is connected to the water inlet of the machine cooler 2, the first water inlet section 61 is horizontally arranged in the middle of the cylinder body 1, and the second water inlet section 62 is vertically arranged in the middle of the cylinder body 1. The water outlet jacket 7 includes a first water outlet section 71 and a second water outlet section 72. One end of the first water outlet section 71 is connected to the water inlet pipe of the water pump 4, and the other end of the first water outlet section 71 is connected to the second water outlet section 72. One end of the second water outlet section 72 is connected to the water outlet of the cylinder head water jacket 52, and the other end of the second water outlet section 72 is connected to the water outlet of the machine cooler 2. The first water outlet section 71 is arranged horizontally in the middle of the cylinder body 1, and the second water outlet section 72 is arranged vertically in the middle of the cylinder body 1. One end of the water outlet jacket 7 close to the cylinder body water jacket 5 is connected to the cooling pipe 3, and the cooling pipe 3 is connected to the water inlet pipe of the water pump 4. A thermostat 8 is provided at the connection between the water outlet jacket 7 and the cooling pipe 3.

[0037] like Figure 7 As shown, the balance shaft 12 drives the water pump 4 to work, and the water pump 4 pumps the cooling water. When the small-circulation water cooling system is used, the thermostat 8 is closed, and the coolant flows along the water pump 4, the water inlet jacket 6, the tank water jacket 51, the connecting water jacket 53, the cylinder head water jacket 52 and the water outlet jacket 7, and finally flows back to the water pump 4. When the large-circulation water cooling system is used, the thermostat 8 is opened, and the coolant flows along the water pump 4, the water inlet jacket 6, the tank water jacket 51, the connecting water jacket 53, the cylinder head water jacket 52, the water outlet jacket 7, the thermostat 8 and the cooling pipe 3, and finally flows back to the water pump 4. The small circulation is continuously working during the large circulation process. When the machine cooler 2 is cooled, the coolant flows along the water pump 4, the water inlet jacket 6, the machine cooler 2 and the water outlet jacket 7, and finally flows back to the water pump 4.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0039] Although the present invention uses more terms such as cylinder block 1, housing 101, cylinder head 102, engine cooler 2, cooling pipe 3, water pump 4, cylinder water jacket 5, housing water jacket 51, annular water jacket 511, cylinder head water jacket 52, external water jacket 521, internal water jacket 522, connecting water jacket 53, water inlet jacket 6, first water inlet section 61, second water inlet section 62, water outlet jacket 7, first water outlet section 71, second water outlet section 72, thermostat 8, cylinder hole 9, exhaust hole 10, avoidance channel 11, balance shaft 12, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A water cooling system for a motorcycle engine, the engine comprising a cylinder body (1) and an engine cooler (2) fixedly connected to the cylinder body (1), the water cooling system comprising a cooling pipe (3), a water pump (4) fixedly connected to the cylinder body (1), and a cylinder body water jacket (5), a water inlet water jacket (6) and a water outlet water jacket (7) located in the cylinder body (1), characterized in that The water outlet pipe of the water pump (4) is connected to the machine cooler (2) and the cylinder water jacket (5) respectively through the water inlet jacket (6); the machine cooler (2) and the cylinder water jacket (5) are both connected to the water inlet pipe of the water pump (4) through the water outlet jacket (7); one end of the water outlet jacket (7) close to the cylinder water jacket (5) is connected to the cooling pipe (3); the cooling pipe (3) is connected to the water inlet pipe of the water pump (4); a thermostat (8) is provided at the connection between the water outlet jacket (7) and the cooling pipe (3); A plurality of cylinder holes (9) are provided, wherein one end of the water inlet jacket (6) and the water outlet jacket (7) connected to the cylinder water jacket (5) is located between two adjacent cylinder holes (9), and the cylinder (1) has an exhaust hole (10), and one end of the water inlet jacket (6) and the water outlet jacket (7) connected to the cylinder water jacket (5) is located at the exhaust hole (10), and the water inlet jacket (6) comprises a first water inlet section (61) and a second water inlet section (62), and one end of the first water inlet section (61) is connected to the water outlet of the water pump (4). The first water inlet section (61) and the second water inlet section (62) are connected to each other by a pipe, the other end of the first water inlet section (61) is connected to the second water inlet section (62), one end of the second water inlet section (62) is connected to the water inlet of the cylinder water jacket (5), and the other end of the second water inlet section (62) is connected to the water inlet of the machine cooler (2), the first water inlet section (61) is arranged horizontally in the middle of the cylinder (1), the second water inlet section (62) is arranged vertically in the middle of the cylinder (1), and the water outlet jacket (7) comprises a first water outlet section (71) and a second water outlet section ( 72), one end of the first water outlet section (71) is connected to the water inlet pipe of the water pump (4), the other end of the first water outlet section (71) is connected to the second water outlet section (72), one end of the second water outlet section (72) is connected to the water outlet of the cylinder water jacket (5), the other end of the second water outlet section (72) is connected to the water outlet of the machine cooler (2), the first water outlet section (71) is arranged horizontally in the middle of the cylinder (1), and the second water outlet section (72) is arranged vertically in the middle of the cylinder (1).

2. A water cooling system for a motorcycle engine according to claim 1, characterized in that: The water inlet jacket (6) and the water outlet jacket (7) are arranged adjacent to each other.

3. A water cooling system for a motorcycle engine according to claim 1 or 2, characterized in that: The cylinder body (1) comprises a casing (101) and a cylinder head (102); the cylinder body water jacket (5) comprises a casing water jacket (51), a cylinder head water jacket (52) and a plurality of connecting water jackets (53); the casing water jacket (51) is located in the casing (101); the cylinder head water jacket (52) is located in the cylinder head (102); the connecting water jacket (53) is located between the casing water jacket (51) and the cylinder head water jacket (52); the casing water jacket (51) and the cylinder head water jacket (52) are connected via the connecting water jackets (53) arranged at intervals; the casing water jacket (51) is in a flat ring shape; the water outlet of the water inlet water jacket (6) is located in the middle of one side of the casing water jacket (51); and the water outlet water jacket (7) is connected to the center of the cylinder head water jacket (52).

4. A water cooling system for a motorcycle engine according to claim 3, characterized in that: The cylinder head water jacket (52) comprises an annular outer water jacket (521) and an inner water jacket (522) located inside the outer water jacket (521); the outer water jacket (521) is partially arranged along the casing water jacket (51) and the outer water jacket (521) is connected to the casing water jacket (51) via a connecting water jacket (53); the center of the inner water jacket (522) is connected to the water outlet water jacket (7).

5. A water cooling system for a motorcycle engine according to claim 3, characterized in that: The housing water jacket (51) is disposed symmetrically with the center of the cylinder head water jacket (52) as the center, the cylinder head water jacket (52) is disposed symmetrically with the center of the cylinder head water jacket (52) as the center, and all the connecting water jackets (53) are disposed symmetrically with the center of the cylinder head water jacket (52) as the center.

6. A water cooling system for a motorcycle engine according to claim 3, characterized in that: The box water jacket (51) comprises a section of annular water jacket (511) in the form of an open ring, the outlet water jacket (7) having an escape channel (11), the outlet water jacket (7) being divided into two parts at the escape channel (11), and the two separated parts being symmetrically arranged, the escape channel (11) being arranged facing the cavity inside the annular water jacket (511).

7. A water cooling system for a motorcycle engine according to claim 3, characterized in that: The sum of the depths of the cylinder head water jacket (52), the connecting water jacket (53) and the casing water jacket (51) is between 30 mm and 50 mm, and the depth of the casing water jacket (51) is greater than the depth of the cylinder head water jacket (52).

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