CN113027588A

CN113027588A - Engine water-cooling structure

Info

Publication number: CN113027588A
Application number: CN202110495035.7A
Authority: CN
Inventors: 张立成; 邓定红; 周鹏博; 程雪君
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2021-06-25

Abstract

The invention provides an engine water cooling structure, and belongs to the technical field of engines. It has solved the not enough technical problem of current engine water-cooling structure cooling effect. In the water-cooling structure of the engine, the engine comprises a cylinder body, a water inlet channel and a cylinder barrel are arranged in the cylinder body, the water-cooling structure comprises a first water jacket which is arranged around the outer peripheral surface of the cylinder barrel, the first water jacket is annular, the water inlet channel is communicated with the first water jacket through a diversion channel, the inner side wall of the water outlet of the diversion channel is provided with a diversion surface which is arranged in parallel with the axial lead of the cylinder barrel, the plane where the diversion surface is located is tangent or approximately tangent to the outer peripheral surface of the cylinder barrel, and when cooling liquid passes through the diversion surface, the cooling liquid can flow around the first water jacket in one direction after entering. The invention ensures that the cooling liquid can be more fully circulated on the periphery of the cylinder barrel before flowing into the cylinder cover, thereby ensuring more full heat absorption and improving the cooling effect.

Description

Engine water-cooling structure

Technical Field

The invention belongs to the technical field of engines, and relates to an engine water cooling structure.

Background

The engine of motorcycle is a machine which ignites the fuel mixture in the cylinder to burn and generate heat energy to be changed into mechanical energy, and the power is transmitted to the rear wheel of the motorcycle by a crankshaft through a transmission mechanism to be changed into the driving power of the vehicle. After the engine is started in a cold state, a warm-up operation is required, and at the moment, the coolant circulates in the engine water jacket in a small mode, so that the temperature of the coolant is rapidly increased to 60 ℃. The warm-up is a necessary method for protecting the machine, otherwise, accidents such as cylinder burst or piston abrasion are likely to happen, and piston rods are likely to break.

Chinese patent application publication No. CN107542592A discloses a water-cooled motorcycle engine cylinder block structure, in which a cylinder bore, four bolt mounting holes and a chain cavity are arranged on the cylinder block; four bolt mounting holes are arranged around the cylinder hole; the cooling water channel is arranged on the cylinder body, surrounds the cylinder hole and bypasses the periphery of the bolt mounting hole so as to surround the bolt mounting hole, a water inlet of the cooling water channel is connected with a cooling box, and a refrigerating sheet is arranged in the cooling box.

The cooling water channel of the structure surrounds the cylinder hole and the periphery of the bolt mounting hole, the heat dissipation area is increased, and the cooling water channel has a good cooling effect, but cooling liquid cannot sufficiently exchange heat with the cylinder body after entering the cooling water channel, so that the cooling effect is influenced. For example, 1, increasing the inner wall area of the cooling water channel and increasing the heat dissipation surface are easy to consider by those skilled in the art for further improving the cooling effect of the engine; 2. the side wall of the cylinder body at the periphery of the water jacket is provided with a radiating fin and other structures.

Disclosure of Invention

The invention provides an engine water cooling structure aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the cooling effect of the engine.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an engine water-cooling structure, the engine includes the cylinder body, inhalant canal and cylinder have in the cylinder body, water-cooling structure is including winding the water jacket that the cylinder periphery set up is one, its characterized in that, water jacket one is the annular, inhalant canal and this water jacket one pass through water conservancy diversion passageway intercommunication, the inside wall of water conservancy diversion passageway delivery port department have with cylinder axial lead parallel arrangement's water conservancy diversion face, the plane at this water conservancy diversion face place and the closest the cylinder periphery is tangent or approximately tangent, can follow this water jacket one-way and encircle the flow when the coolant liquid warp in water conservancy diversion face gets into water jacket one.

The engine is provided with a cylinder body and a cylinder cover, an air inlet and an air outlet are arranged on the cylinder cover, the air inlet device is used for mixing clean air and fuel and guiding the air and the fuel into a combustion chamber for combustion, high-temperature waste gas after combustion is discharged out of the combustion chamber through the air outlet, a water inlet channel and a cylinder barrel are arranged in the cylinder body, the cylinder barrel is communicated with the combustion chamber and can be used for reciprocating motion of a connecting rod piston to perform stroke work, cooling liquid can enter a water jacket I from the water inlet channel, the water jacket I is arranged around the cylinder barrel, the cooling liquid flowing in the water jacket I can absorb heat dissipated by. The water jacket I is annular, the water inlet channel is communicated with the water jacket I through the guide channel, the inner side wall of the water outlet of the guide channel is provided with the guide surface parallel to the axial lead of the cylinder barrel, the plane where the guide surface is located is tangent or approximately tangent to the outer peripheral surface of the closest cylinder barrel, and then the cooling liquid enters the water jacket I through the guide surface and can flow around the water jacket I in a single direction, so that the pressurized cooling liquid is guided by the guide surface when being sprayed out from the water inlet channel to form an initial speed moving towards the single side of an inner cavity space of the water jacket I along the outer side wall surface of the cylinder barrel, the energy loss and unstable flow direction caused by the direct front impact of the cooling liquid and the side wall of the cylinder barrel are reduced, as the water jacket I is a closed loop, the continuously sprayed cooling liquid can provide continuous unidirectional circulation power for the cooling liquid retained in the water jacket I, and the phenomenon that the circumferential kinetic energy is offset due to the fact that, the cooling liquid can be ensured to circulate more fully on the periphery of the cylinder barrel before flowing into the cylinder cover, so that more sufficient heat absorption is ensured, and the cooling effect is improved.

In the above water-cooling structure of the engine, the inner side wall of the water outlet of the diversion channel is further provided with a diversion surface, the diversion surface and the diversion surface are respectively located on two sides of the diversion channel, and the plane where the diversion surface is located is tangent or approximately tangent to the closest outer peripheral surface of the cylinder barrel. The inner side wall of the water outlet of the flow guide channel is provided with the flow guide surface, so that the flow guide surface and the flow guide surface are respectively arranged at two sides of the flow guide channel, and the plane where the flow guide surface is located is tangent or approximately tangent to the outer peripheral surface of the cylinder barrel, therefore, the cooling liquid can be guided by the flow guide surface when being sprayed out of the flow guide channel, the flow direction disorder generated when the cooling liquid flows out of the flow guide channel is further reduced, the impact loss between the flow direction of the cooling liquid and the cylinder barrel is reduced, and the circulating cooling effect is improved.

In the above water-cooling structure of the engine, the diversion channel is in a necking shape from the water inlet channel to the first water jacket. Be the throat form through setting up the water conservancy diversion passageway, the coolant liquid has higher initial velocity when spouting through the water conservancy diversion passageway like this, does benefit to the direction stability that improves the blowout coolant liquid to guarantee more excellent circulation effect.

In the above-mentioned water-cooling structure of the engine, the engine further comprises a cylinder cover, the cylinder cover is provided with an exhaust port for discharging combustion waste gas, and the water inlet channel and the exhaust port are located on the same side of the periphery of the engine. Exhaust port exhaust gas after just burning can make the gas vent place one side compare the opposite side and have a higher temperature, and the gas vent through setting up inhalant canal and cylinder cap is located the same one side of engine, does benefit to the lower coolant liquid of inhalant canal spun temperature and cools off this side part in advance like this, improves the cooling effect.

In the above water-cooling structure of the engine, the water jacket includes a downstream section and a return section which are communicated with each other end to end, the water outlet of the flow guide channel is located between the head end of the downstream section and the tail end of the return section, the flow guide surface is obliquely arranged towards the side where the downstream section is located, and the exhaust port is located right above the downstream section. The water jacket I is arranged and comprises a downstream section and a backflow section which are communicated end to end, the flow guide surface inclines towards one side where the downstream section is located, the downstream section is a part of the water jacket with the extension direction being matched with the initial speed direction of the cooling liquid flowing out through the flow guide surface, the backflow section is a part of the other water jacket, the water outlet of the flow guide channel is arranged between the head end of the downstream section and the tail end of the backflow section, and the exhaust port is arranged right above the downstream section, so that the cooling liquid can flow into the downstream section first and then enter the backflow section to perform sufficient circulating heat absorption, and the cooling liquid which just enters the downstream section and has lower temperature can more sufficiently absorb high heat in the area where the exhaust port is located, the heat exchange efficiency is improved, and the cooling effect is optimized.

In the water-cooling structure of the engine, the water outlet of the diversion channel is located on the circumferential side wall of the first water jacket. The water outlet of the diversion channel is arranged on the circumferential side wall of the first water jacket, so that the phenomenon that the coolant sprayed from the diversion channel has overlarge initial velocity along the vertical direction to influence the kinetic energy of circumferential circulation can be avoided, and the circulating cooling effect can be guaranteed.

In foretell engine water-cooling structure, water-cooling structure still including be located in the cylinder cap and the inlet opening one, water jacket two and the delivery channel that communicate in proper order, water jacket two sets up around the circumference of this cylinder cap, the position of inlet opening one is followed the axial of cylinder with the position of backward flow section is just to the intercommunication, delivery channel is located keeps away from the one end of inlet opening one. The cylinder cover is internally provided with the water hole I, the water jacket II and the water outlet channel, the water jacket II is arranged around the circumference of the cylinder cover and can provide cooling for the cylinder cover, the position of the water inlet hole I is just communicated with the position of the backflow section along the axial direction of the cylinder barrel, and the water outlet channel is arranged at one end far away from the water inlet hole I, so that cooling liquid entering the water jacket II from the water inlet hole I can flow out of the water outlet channel after being subjected to longer heat exchange distance, and in addition, the cooling liquid can enter the water jacket II through the water inlet hole I after at least absorbing heat through the downstream section, and the cooling effect can be enhanced by fully absorbing heat through the.

In the water-cooling structure of the engine, the first water inlet hole is opposite to the tail end of the backflow section along the axial direction of the cylinder barrel. The position of the first water inlet hole is opposite to the tail end of the backflow section along the axial direction of the cylinder barrel, so that the position of the first water inlet hole is close to that of the flow guide part, and the cooling liquid can enter the second water jacket through the first water inlet hole after circulating for at least one circle in the first water jacket, and the cooling effect is further improved; in addition, the flow direction of the cooling liquid in the water jacket II is just opposite to the flow direction of the cooling liquid in the backflow section, so that heat exchange between the cooling liquids is facilitated, and the cooling effect is improved.

In the water-cooling structure of the engine, the cylinder cover is internally provided with a plurality of combustion chambers, the water jacket II is arranged around the combustion chambers, the cylinder cover is internally provided with a cooling flow passage which penetrates through the two adjacent combustion chambers, two ends of the cooling flow passage are both communicated with the water jacket II, the cylinder cover is internally provided with a water inlet hole II, the two water inlet holes are positioned at the joint of the cooling flow passage and the water jacket II, and the two water inlet holes are opposite to the backflow section along the axial direction of the cylinder barrel. The cylinder cover is internally provided with a cooling flow passage which penetrates through the cylinder cover from two adjacent combustion chambers, two ends of the cooling flow passage are communicated with the second water jacket, so that cooling liquid can enter a region between the combustion chambers to be cooled through the cooling flow passage, in addition, a second water inlet hole is arranged in the cylinder cover, the second water inlet hole is arranged at the joint of the cooling flow passage and the second water jacket, the position of the second water inlet hole is opposite to the position of the backflow section along the axial direction of the cylinder barrel, so that the cooling liquid entering the second water jacket from the second water inlet hole can more smoothly flow into the cooling flow passage, the circulation of the cooling liquid in the cooling flow passage is ensured, and the.

In the water-cooling structure of the engine, a gasket is arranged between the cylinder body and the cylinder cover, a through hole which is just communicated with the first water inlet hole and the second water inlet hole is formed in the gasket, and the section size of the through hole which is just opposite to the first water inlet hole is larger than that of the through hole which is just opposite to the second water inlet hole. Through setting up the gasket between cylinder body and cylinder cap, set up the through-hole just to the intercommunication with inlet opening one and inlet opening two on the gasket, make the cross-sectional dimension of the through-hole just to the inlet opening one be greater than the cross-sectional dimension of the through-hole just to the inlet opening two, so most coolant liquid gets into water jacket two from the through-hole of inlet opening one department, guarantees reasonable flow ratio, makes the cooling effect stable.

In the above water-cooling structure of the engine, the engine further comprises a chain cavity arranged at an interval with the water jacket along the horizontal direction, and the water inlet channel is arranged near the periphery of the chain cavity. Through setting up the chain chamber that the engine includes and a water jacket horizontal interval arrangement, the heat absorption cooling of a water jacket coolant liquid can be received to chain intracavity machine oil, makes the inhalant canal be close to chain chamber periphery and arranges, does benefit to like this and further makes the coolant liquid in the inhalant canal carry out preliminary absorption to the heat in near chain chamber wall, improves the cooling effect.

In the above water-cooling structure for an engine, the water inlet channel extends upward to the top surface of the cylinder block, and the gasket seals the upper end of the water inlet channel. Through setting up the top surface that the inlet channel link up to the cylinder body up to make the gasket with the upper end shutoff of this inlet channel, do benefit to like this and make whole water jacket one can both receive the drive of blowout coolant liquid in the inlet channel all the time along circumference, and then guarantee that one-way whole one-way circulation is stable continuous effect, reinforce the cooling effect.

Compared with the prior art, the invention has the following advantages:

the water cooling structure of the engine is annular by arranging the water jacket I, the guide channel for communicating the water inlet channel and the water jacket I is arranged between the water inlet channel and the water jacket I, the inner side wall of the water outlet of the guide channel is provided with the guide surface, and then the cooling liquid can flow along the water jacket I in a one-way surrounding manner after entering the water jacket I through the guide surface, so that the pressurized cooling liquid can be guided by the guide surface when entering the guide channel from the water inlet channel and sprayed out to form an initial speed moving towards one circumferential direction and one side of the water jacket, and because the water jacket I is closed loop, the continuously sprayed cooling liquid can provide continuous one-way circulating power, the situation that the circumferential kinetic energy is offset by the two-way flowing after the cooling liquid enters the water jacket I and the circumferential kinetic energy is offset, so that the cooling liquid cannot circulate in time and enters the cylinder cover is avoided, the cooling.

Drawings

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is a side view schematic diagram of the present embodiment.

Fig. 3 is a schematic view of the cross-sectional structure a-a in fig. 2.

Fig. 4 is an enlarged view of a portion C in fig. 3.

Fig. 5 is a schematic view of a sectional structure B-B in fig. 2.

Fig. 6 is an exploded perspective view of the present embodiment.

Fig. 7 is a schematic perspective view of the explosion at another angle in the present embodiment.

In the figure, 1, a cylinder body; 11. a water inlet channel; 12. a cylinder barrel; 13. a first water jacket; 131. a forward flow section; 132. a reflux section; 14. a flow guide channel; 141. a flow guide surface; 142. a drainage surface;

2. a cylinder cover; 21. an exhaust port; 22. a water inlet hole I; 23. a second water jacket; 24. a water outlet channel; 25. a combustion chamber; 26. a cooling flow channel; 27. a water inlet hole II;

3. a gasket; 31. a through hole;

4. a chain cavity.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-7, in the water-cooling structure of the engine, the engine includes a cylinder body 1, a water inlet channel 11 and two cylinder barrels 12 are arranged in the cylinder body 1, the water-cooling structure includes a first water jacket 13 arranged around the outer peripheral surfaces of the two cylinder barrels 12, the first water jacket 13 is annular, the water inlet channel 11 is communicated with the first water jacket 13 through a diversion channel 14, the inner side wall of a water outlet of the diversion channel 14 is provided with a diversion surface 141 arranged parallel to the axial lead of the cylinder barrel 12, the plane of the diversion surface 141 is separated from and approximately tangent to the outer peripheral surface of the cylinder barrel 12, and when cooling liquid enters the first water jacket 13 through the diversion surface 141, the cooling liquid can flow around the first water jacket 13. Be provided with cylinder body 1 and cylinder cap 2 on the engine, air inlet and gas vent 21 have been arranged on cylinder cap 2, air inlet unit is used for leading-in combustion chamber 25 with clean air and fuel mixture and burns, gas vent 21 discharges the combustion chamber 25 of the high temperature waste gas after burning, have inlet channel 11 and cylinder 12 in the cylinder body 1, cylinder 12 and combustion chamber 25 intercommunication can supply the reciprocating motion of connecting rod piston to carry out the stroke and do work, the coolant liquid can get into water jacket 13 from inlet channel 11, water jacket 13 arranges around cylinder 12 and can make the coolant liquid that constantly flows in water jacket 13 absorb the heat that cylinder 12 dispels, realize the cooling effect. The water jacket I13 is arranged to be annular, the guide channel 14 is arranged on the inner side wall of the water outlet of the water inlet channel 11, the guide surface 141 is arranged on the guide channel 14, and then the cooling liquid enters the water jacket I13 through the guide surface 141 and flows around the water jacket I13 in a single direction, so that the pressurized cooling liquid is guided by the guide surface 141 when being sprayed out from the water inlet channel 11 to form an initial speed moving towards the water jacket I13 in a circumferential single-side direction, and because the water jacket I13 is closed in the circumferential direction, the continuously sprayed cooling liquid can provide continuous one-way circulating power, the situation that the cooling liquid enters the water jacket I13 and then flows in a two-way direction to offset circumferential kinetic energy to cause that the cooling liquid cannot circulate in time and enters the cylinder cover 2 is avoided, the situation that the cooling liquid can circulate more fully on the periphery of the cylinder barrel 12 before flowing into the cylinder cover 2 is ensured, further. Further, the inner side wall of the water outlet of the diversion channel 14 further has a diversion surface 142, the diversion surface 142 and the diversion surface 141 are respectively located at two sides of the diversion channel 14, and a plane where the diversion surface 142 is located is tangent or approximately tangent to the outer peripheral surface of the cylinder 12. The diversion channel 14 is in a necking shape from the water inlet channel 11 to the water jacket I13, so that the cooling liquid is guided by the diversion surface 142 when being sprayed out of the diversion channel 14, the improvement of the flow rate and the direction stability of the cooling liquid is facilitated, the flow direction disorder generated when the cooling liquid flows out of the diversion channel 14 is further reduced, the impact loss between the flow direction of the cooling liquid and the cylinder 12 is reduced, and the circulating cooling effect is improved, the water jacket I13 comprises a forward flow section 131 and a backflow section 132 which are communicated end to end and are both in a J shape, the water outlet of the diversion channel 14 is located between the head end of the forward flow section 131 and the tail end of the backflow section 132, the diversion surface 141 is obliquely arranged towards one side where the forward flow section 131 is located, and the exhaust port 21 is located right above the forward flow section 131. The first water jacket 13 is arranged to comprise a forward flow section 131 and a return flow section 132 which are communicated end to end, the guide surface 141 is inclined towards one side where the forward flow section 131 is located, the forward flow section 131 is a first water jacket 13 part with the extending direction matched with the initial speed direction of the cooling liquid flowing out through the guide surface 141, the return flow section 132 is another first water jacket 13 part, the water outlet of the guide channel 14 is arranged between the head end of the forward flow section 131 and the tail end of the return flow section 132, and the exhaust port 21 is arranged right above the forward flow section 131, so that the cooling liquid can flow into the forward flow section 131 first and then enter the return flow section 132 to perform sufficient circulation heat absorption, and the cooling liquid which just enters the forward flow section 131 and has lower temperature can more fully absorb the high heat of the region where the exhaust port 21 is located, thereby improving the heat exchange efficiency and optimizing the cooling effect. Preferably, the water outlet of the water inlet channel 11 is positioned on the circumferential side wall of the first water jacket 13. The water outlet of the water inlet channel 11 is arranged on the circumferential side wall of the water jacket 13, so that the situation that the coolant sprayed from the water inlet channel 11 has overlarge initial velocity along the vertical direction and influences the kinetic energy of circumferential circulation can be avoided, and the circulating cooling effect is favorably ensured. The engine also comprises a chain cavity 4 which is arranged at a distance from the water jacket I13 along the horizontal direction, and the water inlet channel 11 is arranged close to the periphery of the chain cavity 4. Through setting up the engine and including the chain chamber 4 with water jacket 13 horizontal interval arrangement, the heat absorption cooling of water jacket 13 coolant liquid can be received to machine oil in chain chamber 4, makes inhalant canal 11 be close to chain chamber 4 peripheral arrangement, does benefit to like this and further makes the coolant liquid in the inhalant canal 11 carry out preliminary absorption to the heat in 4 chamber walls of nearby chain chamber, improves the cooling effect.

As shown in fig. 1 to 3 and 5 to 7, the engine further includes a cylinder head 2, and two exhaust ports 21 for discharging combustion exhaust gas are provided on one side of the circumferential surface of the cylinder head 2, and the water intake passage 11 and the exhaust ports 21 are located on the same side of the outer periphery of the engine. The exhaust port 21 discharges exhaust gas after combustion, so that the exhaust port 21 has higher temperature on one side than the other side, and the water inlet channel 11 and the exhaust port 21 on the cylinder cover 2 are arranged on the same side of the engine, so that the lower-temperature cooling liquid sprayed by the water inlet channel 11 is favorable for cooling the side part in advance, and the cooling effect is improved. The water cooling structure further comprises a first water inlet hole 22, a second water jacket 23 and a water outlet channel 24 which are located in the cylinder cover 2 and are sequentially communicated, the second water jacket 23 is arranged around the circumferential direction of the cylinder cover 2, the first water inlet hole 22 is in direct-facing communication with the backflow section 132 along the axial direction of the cylinder barrel 12, and the water outlet channel 24 is located at one end far away from the first water inlet hole 22. Through setting up water hole one, water jacket two 23 and exhalant canal 24 in cylinder cap 2, water jacket two 23 sets up around cylinder cap 2's circumference and can provide the cooling for cylinder cap 2, makes the position of inlet hole one 22 just to communicate with the position of backward flow section 132 along the axial of cylinder 12 to set up exhalant canal 24 and be located the one end of keeping away from inlet hole one 22, guarantees like this that the coolant liquid that gets into water jacket two 23 from inlet hole one 22 can only flow out from exhalant canal 24 after longer heat exchange distance, in addition the coolant liquid also need get into water jacket two 23 through inlet hole one 22 after the heat absorption of following current section 131 at least, guarantees that the coolant liquid can fully absorb heat and strengthen the cooling effect. Further, the first inlet opening 22 is located opposite to the rear end of the return section 132 in the axial direction of the cylinder 12. The position of the first water inlet hole 22 is opposite to the tail end of the backflow section 132 along the axial direction of the cylinder barrel 12, so that the position of the first water inlet hole 22 is close to the position of the flow guide part 14, and the coolant can enter the second water jacket 23 through the first water inlet hole 22 after circulating for at least one circle in the first water jacket 13, so that the cooling effect is further improved; in addition, the flow direction of the cooling liquid in the water jacket two 23 is just opposite to the flow direction of the cooling liquid in the backflow section 132, so that heat exchange between the cooling liquids is facilitated, and the cooling effect is improved. The cylinder cover 2 is internally provided with two combustion chambers 25 which are in opposite communication with the cylinder barrel 12, the water jacket two 23 is arranged around the combustion chambers 25, the cylinder cover 2 is internally provided with a cooling flow passage 26 which penetrates between the two adjacent combustion chambers 25, two ends of the cooling flow passage 26 are both communicated with the water jacket two 23, the cylinder cover 2 is internally provided with a water inlet hole two 27, the water inlet hole two 27 is positioned at the joint of the cooling flow passage 26 and the water jacket two 23, and the water inlet hole two 27 is opposite to the position of the backflow section 132 along the axial direction of the cylinder barrel 12. A cooling flow channel 26 penetrating through the two adjacent combustion chambers 25 is arranged in the cylinder cover 2, two ends of the cooling flow channel 26 are communicated with the second water jacket 23, so that cooling liquid can enter the region between the combustion chambers 25 to be cooled through the cooling flow channel 26, a second water inlet hole 27 is arranged in the cylinder cover 2, the second water inlet hole 27 is arranged at the joint of the cooling flow channel 26 and the second water jacket 23, the second water inlet hole 27 is opposite to the position of the backflow section 132 along the axial direction of the cylinder barrel 12, so that the cooling liquid entering the second water jacket 23 through the second water inlet hole 27 can smoothly flow into the cooling flow channel 26, circulation of the cooling liquid in the cooling flow channel 26 is guaranteed, and the cooling effect is improved. Preferably, a gasket 3 is arranged between the cylinder body 1 and the cylinder cover 2, a through hole 31 which is in opposite communication with the first water inlet hole 22 and the second water inlet hole 27 is formed in the gasket 3, and the cross-sectional size of the through hole 31 which is in opposite communication with the first water inlet hole 22 is larger than that of the through hole 31 which is in opposite communication with the second water inlet hole 27. Through setting up gasket 3 between cylinder body 1 and cylinder cap 2, set up the through-hole 31 just to the intercommunication with inlet opening one 22 and inlet opening two 27 on gasket 3, make the cross-sectional dimension of the through-hole 31 just to inlet opening one 22 be greater than the cross-sectional dimension of the through-hole 31 just to inlet opening two 27, most coolant liquid gets into water jacket two 23 from the through-hole 31 of inlet opening one 22 department like this, guarantee reasonable flow ratio, make the cooling effect stable. The water inlet channel 11 penetrates upwards to the top surface of the cylinder body 1, and the gasket 3 seals the upper end of the water inlet channel 11. Through setting up inlet channel 11 and lining up to the top surface of cylinder body 1 to make gasket 3 with the upper end shutoff of this inlet channel 11, do benefit to like this and make whole water jacket 13 can both receive the drive of blowout coolant liquid in the inlet channel 11 all the time along circumference, and then guarantee the stable continuous effect of one-way whole one-way circulation, strengthen the cooling effect.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides an engine water-cooling structure, the engine includes cylinder body (1), water channel (11) and cylinder (12) have in cylinder body (1), water-cooling structure is including winding water jacket (13) that cylinder (12) outer peripheral face set up, characterized in that, water jacket (13) are the annular, water channel (11) and this water jacket (13) communicate through water conservancy diversion passageway (14), the inside wall of water outlet department of water conservancy diversion passageway (14) have with cylinder (12) axial lead parallel arrangement's water conservancy diversion face (141), the plane at this water conservancy diversion face (141) place is tangent or nearly tangent with the cylinder (12) outer peripheral face that is closest, can flow along this water jacket (13) one-way encirclement after coolant liquid warp in water conservancy diversion face (141) gets into water jacket (13).

2. The water-cooling structure of the engine as claimed in claim 1, wherein the inner side wall of the water outlet of the flow guide channel (14) is further provided with a flow guide surface (142), the flow guide surface (142) and the flow guide surface (141) are respectively positioned at two sides of the flow guide channel (14), and the plane of the flow guide surface (142) is tangent or approximately tangent to the nearest outer peripheral surface of the cylinder barrel (12).

3. The engine water-cooling structure according to claim 1, characterized in that the flow guide passage (14) is in a shape of a constriction from the water inlet passage (11) to the water jacket one (13).

4. The engine water-cooling structure according to claim 1, 2 or 3, characterized in that the engine further comprises a cylinder head (2), the cylinder head (2) is provided with an exhaust port (21) for discharging combustion exhaust gas, and the water inlet passage (11) and the exhaust port (21) are positioned on the same side of the periphery of the engine.

5. The water-cooling structure of the engine as recited in claim 4, wherein the water jacket I (13) comprises a forward flow section (131) and a return flow section (132) which are communicated with each other end to end, the water outlet of the diversion channel (14) is positioned between the head end of the forward flow section (131) and the tail end of the return flow section (132), the diversion surface (141) is obliquely arranged towards the side where the forward flow section (131) is located, and the exhaust port (21) is positioned right above the forward flow section (131).

6. The water-cooling structure of the engine as claimed in claim 5, further comprising a first water inlet hole (22), a second water jacket (23) and a water outlet channel (24) which are located in the cylinder head (2) and are sequentially communicated, wherein the second water jacket (23) is arranged around the cylinder head (2) in the circumferential direction, the first water inlet hole (22) is located in the axial direction of the cylinder barrel (12) and is in direct communication with the backflow section (132), and the water outlet channel (24) is located at one end far away from the first water inlet hole (22).

7. The water-cooling structure for the engine as claimed in claim 6, wherein the first water inlet hole (22) is located opposite to the rear end of the return section (132) in the axial direction of the cylinder tube (12).

8. The water-cooling structure of the engine as recited in claim 6 or 7, wherein the cylinder head (2) is provided with a plurality of combustion chambers (25), the water jacket two (23) is arranged around the combustion chambers (25), the cylinder head (2) is further provided with a cooling flow passage (26) which passes through between two adjacent combustion chambers (25), two ends of the cooling flow passage (26) are communicated with the water jacket two (23), the cylinder head (2) is further provided with a water inlet hole two (27), the water inlet hole two (27) is positioned at the joint of the cooling flow passage (26) and the water jacket two (23), and the water inlet hole two (27) is opposite to the position of the backflow section (132) along the axial direction of the cylinder barrel (12).

9. The water-cooling structure of the engine as claimed in claim 8, wherein a gasket (3) is arranged between the cylinder body (1) and the cylinder cover (2), the gasket (3) is provided with a through hole (31) which is in direct communication with the first water inlet hole (22) and the second water inlet hole (27), the cross-sectional dimension of the through hole (31) which is in direct communication with the first water inlet hole (22) is larger than that of the through hole (31) which is in direct communication with the second water inlet hole (27), the water inlet channel (11) penetrates upwards to the top surface of the cylinder body (1), and the gasket (3) seals the upper end of the water inlet channel (11).

10. The engine water-cooling structure according to claim 1, 2 or 3, characterized in that the engine further comprises a chain chamber (4) arranged at a distance from the water jacket I (13) in the horizontal direction, and the water inlet passage (11) is arranged near the periphery of the chain chamber (4).