All-terrain vehicle and its engine

Abstract

The present invention discloses an all-terrain vehicle and its engine. The engine includes: a cylinder provided with an exhaust port and a first cooling channel; a crankcase disposed below the cylinder, the top of the crankcase being spaced a predetermined distance from the exhaust port, the crankcase including a second cooling channel communicating with the first cooling channel; a water pump disposed on one side of the crankcase; a cylinder inlet pipe, one end of the cylinder inlet pipe being connected to the water pump, the cylinder inlet pipe being fixedly attached to the top of the crankcase and spaced apart from the cylinder, and the other end of the cylinder inlet pipe communicating with the second cooling channel. Thus, the cylinder inlet pipe and the exhaust pipe can be effectively spaced apart further, so that the high-temperature exhaust pipe can be prevented from affecting the low-temperature cylinder inlet pipe, the cooling water temperature of the cylinder inlet pipe can be effectively reduced, the working reliability of the engine can be ensured, and the fuel efficiency of the engine can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of all-terrain vehicles, and in particular to an all-terrain vehicle and its engine. Background Art

[0002] In a water-cooled engine, a water pump and an oil pump are generally arranged on one side of the crankcase. The water pump is used for the circulation of cooling water, and the oil pump is used for the circulation of lubricating oil. Transmission wheels are generally installed on the oil pump shaft and the water pump shaft. The two transmission wheels are axially spaced apart and are then driven by the transmission wheel of the crankshaft. The water pump needs to supply cooling water to the cylinder.

[0003] Among them, a connecting pipeline is arranged between the water pump and the cylinder, but the connecting pipeline and the exhaust pipe of the cylinder are close to each other. After the engine works for a period of time, the high-temperature exhaust pipe will exchange heat with the low-temperature connecting pipeline, thereby increasing the temperature of the cooling water in the connecting pipeline, resulting in a poor cooling effect of the cylinder, a higher temperature of the cylinder, and an inability to work efficiently. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the present invention is to propose an engine for an all-terrain vehicle, which has a good cooling effect and high working efficiency.

[0005] The present invention further proposes an all-terrain vehicle.

[0006] The engine of the all-terrain vehicle according to the present invention includes: a cylinder provided with an exhaust port and a first cooling channel; a crankcase disposed below the cylinder, the top of the crankcase being spaced from the exhaust port by a predetermined distance, the crankcase including a second cooling channel communicating with the first cooling channel; a water pump disposed on one side of the crankcase; a cylinder inlet pipe, one end of the cylinder inlet pipe being connected to the water pump, the cylinder inlet pipe being fixedly attached to the top of the crankcase and spaced from the cylinder, and the other end of the cylinder inlet pipe communicating with the second cooling channel.

[0007] Thus, since the cylinder inlet pipe and the cylinder are spaced apart, the cylinder inlet pipe and the exhaust pipe can be further effectively spaced apart, thereby avoiding the influence of the high-temperature exhaust pipe on the low-temperature cylinder inlet pipe, effectively reducing the temperature of the cooling water in the cylinder inlet pipe, further improving the cooling effect of the engine, and further ensuring the working reliability of the engine and improving the fuel efficiency of the engine.

[0008] In some examples of the present invention, the cylinder water inlet pipe includes: a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is connected to the water pump, and the other end is connected to one end of the second connecting pipe. The second connecting pipe is fixedly attached to the crankcase.

[0009] In some examples of the present invention, the first connecting pipe is a rubber pipe, and the second connecting pipe is an aluminum alloy pipe.

[0010] In some examples of the present invention, an opening is provided on the pipe wall of the second connecting pipe, and the crankcase closes the opening.

[0011] In some examples of the present invention, the crankcase includes: a box body and a sealing cover. The sealing cover is provided on the box body, and the second connecting pipe is fixedly attached to the sealing cover.

[0012] In some examples of the present invention, the sealing cover is provided with a recess corresponding to and communicating with the opening.

[0013] In some examples of the present invention, a second cooling channel is provided in the box body, and the sealing cover is provided with a water inlet. The water inlet communicates between the second connecting pipe and the second cooling channel, and the second cooling channel also communicates with the first cooling channel.

[0014] In some examples of the present invention, the box body has a first joint surface and a second joint surface. The first joint surface is combined with the cylinder, and the second joint surface is combined with the sealing cover. The water inlet of the second cooling channel is formed on the second joint surface and the water outlet is formed on the first joint surface. The water inlet is provided on one side of the second joint surface adjacent to the first joint surface.

[0015] In some examples of the present invention, the sealing cover is an aluminum alloy cover.

[0016] In some examples of the present invention, the end of the first connecting pipe is sleeved on the end of the second connecting pipe and is externally provided with a clamp.

[0017] In some examples of the present invention, the engine further includes: an oil cooler. The oil cooler is provided on the front side or the rear side of the crankcase. An oil cooler inlet pipe and an oil cooler return pipe are connected between the water pump and the oil cooler.

[0018] In some examples of the present invention, the crankcase includes: a box cover, and the water pump includes: a pump housing. The box cover and the pump housing are integrally formed parts.

[0019] The all-terrain vehicle according to the present invention includes the engine of the all-terrain vehicle.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present invention. Brief Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a perspective view of an engine according to an embodiment of the present invention;

[0023] Figure 2 is a side view of an engine according to an embodiment of the present invention;

[0024] Figure 3 is a sectional view taken along the Figure 2 A-A direction in

[0025] Figure 4 is Figure 3 an enlarged view of region B in

[0026] Figure 5 is a perspective view of an engine according to an embodiment of the present invention and exploded at the sealing cover;

[0027] Figure 6 is an exploded view of the sealing cover and the second connecting pipe;

[0028] Figure 7 is an exploded view of the tank cover and the pump cover;

[0029] Figure 8 is a perspective view of the tank cover;

[0030] Figure 9 is an exploded view of the balance shaft and the pump shaft.

[0031] Reference Signs:

[0032] Engine 1000;

[0033] Crankcase 100; Case body 110; Second joint surface 110b; Tank cover 111; Pump housing 112; Through hole 113; Large hole section 113a; Small hole section 113b; Impeller cavity 114; Sealing cover 115; Recess 116; Water inlet 117; Second cooling channel 118; Cylinder water inlet interface 119;

[0034] Crankshaft 120; Balance shaft 130; Groove 131; Pump cover 140; Water pump inlet interface 141; Cylinder return water interface 142; Oil cooler return water interface 143;

[0035] Water pump 200; Pump shaft 210; Projection 211; First shaft section 212; Second shaft section 213;

[0036] Bushing 220; impeller 230; sealing ring 240; first washer 250; second washer 260; fastener 270; oil seal 280;

[0037] Generator 300; oil cooler 400; oil cooler inlet pipe 410; oil cooler return pipe 420;

[0038] Cylinder 500; exhaust port 510; cylinder inlet pipe 600; first connecting pipe 610; second connecting pipe 620. Detailed implementation manners

[0039] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0040] Below, refer to Figures 1-9 Describe an engine 1000 according to an embodiment of the present invention. The engine 1000 is applied to an all-terrain vehicle.

[0041] As Figure 1 And Figure 2 As shown, the engine 1000 according to an embodiment of the present invention may include: a crankcase 100, a cylinder 500, and a water pump 200. The cylinder 500 is installed above the crankcase 100, and the water pump 200 is installed on one axial side of the crankcase 100, that is, one side in the left-right direction. For example, the water pump 200 may be installed on the left side of the crankcase 100. Among them, the right side of the crankcase 100 can be adjusted and arranged according to the power type of the all-terrain vehicle. For example, if the all-terrain vehicle is a hybrid all-terrain vehicle, a generator 300 may be provided on the right side of the crankcase 100. The generator 300 may be electrically connected to the motor, and the motor outputs power to drive the all-terrain vehicle. Or, if the all-terrain vehicle is a pure fuel all-terrain vehicle, a transmission may be provided on the right side of the crankcase 100.

[0042] As Figure 3 As shown, a plurality of transmission components may be arranged in the crankcase 100, including: a box body 110, a box cover 111, a crankshaft 120, and a balance shaft 130. The crankshaft 120 and the balance shaft 130 are both arranged in the box body 110. A box cover 111 is fixed to one side of the box body 110. A piston is arranged in the cylinder 500. A piston rod and a connecting rod connect the piston and the crankshaft 120. In this way, the reciprocating motion of the piston can be converted into the rotation of the crankshaft 120. The crankshaft 120 and the balance shaft 130 are in transmission, and the balance shaft 130 can effectively smooth the vibration of the engine 1000 and improve the performance of the engine 1000.

[0043] As Figure 3As shown, the water pump 200 includes a pump shaft 210, a shaft sleeve 220, and an impeller 230. The first axial end of the pump shaft 210 is fixedly connected to the balance shaft 130 or the crankshaft 120, that is, the right end of the pump shaft 210 is fixedly connected to the left end of the balance shaft 130. The shaft sleeve 220 is sleeved on the pump shaft 210, and the impeller 230 is arranged at the second axial end of the pump shaft 210, that is, the left end of the pump shaft 210. Moreover, the impeller 230 abuts against the shaft sleeve 220 so that the impeller 230, the shaft sleeve 220, and the pump shaft 210 rotate synchronously. That is to say, the shaft sleeve 220 is sleeved on the pump shaft 210 and then abuts against the impeller 230, so that the pump shaft 210, the impeller 230, and the shaft sleeve 220 can rotate synchronously. The impeller 230 can stir the cooling water around it, so that the cooling water is supplied to the corresponding components to be cooled.

[0044] Thus, by driving the pump shaft 210 to rotate through the balance shaft 130 or the crankshaft 120, the rotation speed of the pump shaft 210 can be increased, and the water pumping capacity of the impeller 230 can be further improved. In this way, on the basis of ensuring sufficient water pumping volume, the size of the impeller 230 can be correspondingly reduced, and thus the volume of the water pump 200 can be further reduced, which is beneficial to the miniaturization design goal of the engine 1000. Moreover, the setting of the shaft sleeve 220 can ensure the installation reliability of the impeller 230, improve the corrosion resistance of the pump shaft 210, and also facilitate the contact between other components and the pump shaft 210.

[0045] According to an optional embodiment of the present invention, as Figure 4 shown, the first axial end of the pump shaft 210 is fixedly connected to the balance shaft 130. An axially extending groove 131 is provided at the axial end of the balance shaft 130. An axially extending convex block 211 is provided at the first axial end (i.e., the right end) of the pump shaft 210. The convex block 211 is fitted in the groove 131, and the convex block 211 is circumferentially limited with respect to the groove 131. The cooperation mode of the groove 131 and the convex block 211 is simple and reliable, and can effectively perform circumferential limitation, ensuring the transmission stability of the balance shaft 130 and the pump shaft 210. Among them, the convex block 211 can be a sheet-like structure with a certain thickness, and the groove 131 correspondingly is a long groove with a certain thickness, so as to effectively ensure the circumferential limitation of the convex block 211 and the groove 131.

[0046] Among them, the convex block 211 and the groove 131 can be in clearance fit. The clearance fit can facilitate assembly and avoid the jamming phenomenon caused by the non-coaxiality of the pump shaft 21 and the balance shaft 130 due to machining errors, thereby increasing the transmission stability.

[0047] Among them, as Figure 9As shown, the protrusion 211 is a non-circular protrusion 211, and the groove 131 is a non-circular groove 131. The protrusion 211 and the groove 131 set in this way can utilize the protruding part of the protrusion 211 to cooperate with the part of the groove 131, so that the balance shaft 130 and the pump shaft 210 can rotate synchronously, and can also ensure that the two are coaxially arranged.

[0048] Furthermore, if Figure 9 As shown, the protrusion 211 is a flat block, and the cross section of the protrusion 211 is a rectangular, and the groove 131 is a flat square groove, and the cross section of the groove 131 is a rectangular. The protrusion 211 and the groove 131 set in this way have a simple structure, and are convenient for alignment during assembly, and can ensure the structural reliability of the pump shaft 210 and the balance shaft 130, and can further improve the matching reliability of the two.

[0049] Also, if Figure 9 As shown, both ends of the groove 131 in the width direction are open, and both ends of the protrusion 211 in the width direction extend out of both ends of the groove 131. In other words, the length of the protrusion 211 in the width direction is greater than the length of the groove 131 in the width direction. The protrusion 211 and the groove 131 arranged in this way are stably matched, and the structural strength of the protrusion 211 is high, which can prevent the protrusion 211 from being deformed during the transmission process.

[0050] Furthermore, if Figure 4 As shown, the outer circumferential surface of the pump shaft 210 is provided with a circumferentially extending receiving groove, that is, the receiving groove is annular, and a sealing ring 240 is provided in the receiving groove, and the sealing ring 240 stops against the inner circumferential surface of the sleeve 220. In other words, the sealing ring 240 is provided between the pump shaft 210 and the sleeve 220. By providing the sealing ring 240, the gap between the pump shaft 210 and the sleeve 220 can be effectively sealed, and the inner cavity of the water pump 200 and the inner cavity of the crankcase 100 can be effectively separated, so that the reliability of the engine 1000 can be improved.

[0051] Among them, Figure 4 As shown, the pump shaft 210 includes: a first shaft section 212 and a second shaft section 213, the first shaft section 212 and the second shaft section 213 are connected, the first shaft section 212 and the second shaft section 213 are connected with different outer diameters, the outer diameter of the first shaft section 212 is larger than the outer diameter of the second shaft section 213, and a step is formed at the connection between the first shaft section 212 and the second shaft section 213, and the sleeve 220 and the impeller 230 are sleeved on the second shaft section 213. Thus, the step can limit the axial position of the sleeve 220 and the impeller 230, and at least to a certain extent can prevent the sleeve 220 and the impeller 230 from axial movement. Moreover, the pump shaft 210 configured in this way can also facilitate the sleeve setting of the sleeve 220.

[0052] Furthermore, if Figure 4As shown, a first washer 250 is provided at the step, and the bushing 220 abuts against the first washer 250. By providing the first washer 250, a buffering effect can be achieved between the bushing 220 and the step, and it can be avoided that the bushing 220 directly impacts the step of the pump shaft 210 when axially moving, thereby ensuring the structural reliability of the water pump 200. Moreover, the first washer 250 can also be attached to the inner side wall of the pump housing 112 of the water pump 200, and it can play a sealing role to at least a certain extent.

[0053] Optionally, as Figure 4 shown, a second washer 260 and a fastener 270 are provided at the axial second end of the pump shaft 210. The fastener 270 passes through the second washer 260 to fix the impeller 230 at the axial second end of the pump shaft 210. The second washer 260 abuts against the impeller 230, and the second washer 260 is located axially outside the impeller 230. It can be understood that a threaded hole is provided at the end of the second shaft section 213 of the pump shaft 210, and the fastener 270 can be a bolt. After the bolt passes through the second washer 260, it extends into the threaded hole. In this way, the fastener 270 can fasten the impeller 230 and the bushing 220 on the second shaft section 213, so that the impeller 230 and the bushing 220 can rotate synchronously with the second shaft section 213, ensuring the water pumping capacity of the impeller 230. The second washer 260 can prevent the impeller 230 and the fastener 270 from directly contacting, effectively protecting the impeller 230.

[0054] Combined with Figure 3 and Figure 4 shown, the pump housing 112 of the water pump 200 is integrally formed on the cover 111 of the box. The pump housing 112 is provided with an axially extending through hole 113, and the pump shaft 210 is disposed in the through hole 113. By integrally forming the pump housing 112 on the cover 111 of the box, the process of providing the pump housing 112 and installing the pump housing 112 can be omitted, and the structural reliability of the crankcase 100 and the water pump 200 can be ensured. The through hole 113 can facilitate the connection between the pump shaft 210 and the balance shaft 130 after passing through. By reasonably setting the inner diameter of the through hole 113, it is also possible to at least a certain extent avoid the cooling water from entering the internal space of the box body 110. It should be noted that the axial first end of the pump shaft 210 can also be selected to be directly driven by the crankshaft 120 to replace the way of driving with the balance shaft 130.

[0055] According to a specific embodiment of the present invention, as Figure 4As shown, the engine 1000 may further include: an oil seal 280 sleeved on the shaft sleeve 220. The shaft sleeve 220 can rotate relative to the oil seal 280, and the outer periphery of the oil seal 280 also abuts against the inner peripheral wall of the through hole 113. The pump housing 112 further forms an impeller chamber 114 around the impeller 230. There is flowing cooling water in the impeller chamber 114, and the impeller 230 can pump the cooling water in the impeller chamber 114 to the position of the component to be cooled through the interface. The oil seal 280 can play a sealing role. It can also replace the water seal to isolate the impeller chamber 114 and the internal space of the box body 110. Moreover, the oil seal 280 is more suitable for working at high speeds than the water seal, which can make the sealing effect of the water pump 200 better. In addition, the cost of the oil seal 280 is relatively low.

[0056] Specifically, as Figure 4 shown, there are two oil seals 280, and the two oil seals 280 are arranged at intervals in the axial direction. By arranging two oil seals 280, the sealing effect of the water pump 200 can be improved to at least a certain extent, and the structure of the engine 1000 can be made more reliable and stable. The outer diameters of the two oil seals 280 can be different. For example, the outer diameter of the oil seal 280 close to the impeller 230 can be larger than the outer diameter of the oil seal 280 far from the impeller 230, which can adapt to the size of the through hole 113 and can also better seal the water pump 200.

[0057] Specifically, as Figure 4 shown, the through hole 113 includes: a large hole section 113a and a small hole section 113b. The small hole section 113b is located inside the large hole section 113a, and the small hole section 113b corresponds to the first shaft section 212 of the pump shaft 210. Among them, the small hole section 113b and the first shaft section 212 of the pump shaft 210 are in clearance fit, so that the first shaft section 212 of the pump shaft 210 can rotate freely in the small hole section 113b. The large hole section 113a corresponds to the second shaft section 213 of the pump shaft 210. In the radial direction, there is a certain accommodation space between the inner peripheral wall of the large hole section 113a and the outer peripheral surface of the second shaft section 213 of the pump shaft 210, which is convenient for arranging some seals. For example, the oil seal 280 is arranged in the large hole section 113a, and the two oil seals 280 are arranged at intervals in the axial direction of the large hole section 113a. For example, the two oil seals 280 are respectively adjacent to the two axial ends of the large hole section 113a, and the oil seal 280 abuts against the inner peripheral wall of the large hole section 113a. It can be understood that by reasonably setting the large hole section 113a and the second shaft section 213 of the pump shaft 210, it is convenient to set the oil seal 280. The oil seal 280 can isolate the impeller chamber 114 and the internal space of the box body 110 at the mating part, preventing the water in the impeller chamber 114 from entering the internal space of the box body 110, and ensuring the sealing reliability of the engine 1000.

[0058] Further, the inner peripheral wall of the large-hole section 113a is provided with an outer step portion and an inner step portion. One of the two oil seals 280 abuts against the outer step portion, and the other of the two oil seals 280 abuts against the inner step portion. The provision of the outer step portion and the inner step portion can effectively improve the position reliability of the two oil seals 280 in the large-hole section 113a, and can further enhance the sealing effect of the oil seals 280, and can ensure the sealing reliability of the engine 1000.

[0059] According to an alternative embodiment of the present invention, in combination with Figure 1 and Figure 4 As shown, an oil cooler 400 is provided on the outer side of the housing 110. The pump housing 112 further forms an impeller chamber 114 on the outer side of the through hole 113, and the impeller chamber 114 is connected to an oil cooler inlet pipe 410. The oil cooler 400 can cool the engine oil of some components of the engine 1000. The pump housing 112 can be provided with an interface for connecting the oil cooler inlet pipe 410. By forming the impeller chamber 114 in the pump housing 112, it is convenient to arrange the impeller 230 and to connect the oil cooler inlet pipe 410. Among them, the oil cooler 400 is provided on the front side or the rear side of the crankcase 100. An oil cooler return pipe 420 is also connected between the water pump 200 and the oil cooler 400. The cold water in the impeller chamber 114 enters the interior of the oil cooler 400 through the oil cooler inlet pipe 410, exchanges heat fully with the lubricating oil, reduces the temperature of the lubricating oil, and finally returns water to the impeller chamber 114 of the water pump 200 through the oil cooler return pipe 420.

[0060] Among them, as Figure 1 shown, the pump housing 112 is located at the edge of the housing cover 111. The pump housing 112 is arranged reasonably in this way, which can reduce the manufacturing difficulty of the housing cover 111, and it can match the pump shaft 210 and the impeller 230.

[0061] Optionally, as Figure 1 shown, a cylinder inlet pipe 600 is connected between the impeller chamber 114 and the cylinder 500. The interface for connecting the impeller chamber 114 to the cylinder inlet pipe 600 is arranged obliquely above the impeller chamber 114, that is, this interface is arranged obliquely above the position of the pump housing 112 corresponding to the impeller chamber 114. By providing the cylinder inlet pipe 600, the impeller chamber 114 can supply cooling water to the cylinder 500, so that the working temperature of the cylinder 500 can be effectively reduced when the engine 1000 is working, and the engine 1000 can be in a reasonable working temperature range. Moreover, by arranging the interface obliquely above the impeller chamber 114, it is convenient to connect between the cylinder 500 and the impeller chamber 114, and the length of the cylinder inlet pipe 600 can be reduced, and in this way, the arrangement difficulty of the cylinder inlet pipe 600 can be further simplified.

[0062] According to a specific embodiment of the present invention, as Figure 1 andFigure 4 As shown, the lid 111 is recessed towards the inner space to form the pump housing 112, and the pump cover 140 is fixed to the outside of the pump housing 112. By adopting the method of recessing inward to form the pump housing 112, a pump housing 112 with sufficient space can be formed at the lid 111. The pump housing 112 can accommodate the impeller 230 and the pump shaft 210, and the outer pump cover 140 can effectively seal the space of the pump housing 112, thereby ensuring the sealing performance of the water pump 200.

[0063] Among them, as Figure 8 shown, the lid 111 is provided with an annular edge extending outward at the outer periphery of the through hole 113, and the annular edge defines the impeller cavity 114. At least a part of the impeller 230 is accommodated in the impeller cavity 114. That is to say, the lid 111 can extend an annular edge around the position of the through hole 113 on its outer surface, and the annular edge can define an impeller cavity 114 for accommodating the impeller 230. The pump housing 112 configured in this way has a simple structure, can reduce the molding difficulty of the lid 111, and can effectively accommodate the impeller 230.

[0064] In addition, as Figure 8 shown, the lid 111 is further provided with a cylinder water inlet interface 119 on one side of the annular edge, and the cylinder water inlet interface 119 communicates with the impeller cavity 114. That is to say, the lid 111 is integrally formed not only with the pump housing 112, but also with the cylinder water inlet interface 119 on this basis. In this way, there is no need to supplement the cylinder water inlet interface 119 on the pump housing 112, which can further simplify the structure of the engine 1000 and make the structure of the water pump 200 more reliable.

[0065] Specifically, as Figure 1 shown, the pump cover 140 is provided with a water pump water inlet interface 141, a cylinder water return interface 142 and an oil cooler water return interface 143. The water pump water inlet interface 141, the cylinder water return interface 142 and the oil cooler water return interface 143 are connected and communicated. The pump cover 140 is further provided with reinforcing ribs, and the reinforcing ribs extend from the edge of the pump cover 140 to the connection of the water pump water inlet interface 141, the cylinder water return interface 142 and the oil cooler water return interface 143. Thus, the pump cover 140 integrates three interfaces, and the cooling water at these three interfaces can enter the impeller cavity 114 and then be supplied to the corresponding components for cooling. The setting of the reinforcing ribs can improve the reliability of the pump cover 140 and the reliability of the three interfaces on the pump cover 140, thereby further improving the reliability of the engine 1000.

[0066] Optionally, a visible tube is also provided on the pump housing 112. One end of the visible tube communicates with the impeller chamber 114, and the other end is closed. The visible tube is a transparent tube through which the internal cooling water can be directly seen from the outside, which facilitates the user to monitor the water quality in the water pump 200, so as to know the water quality in the entire circulation loop, facilitate the user to replace the cooling water in time, and further ensure the working stability of the engine 1000.

[0067] Next, the structure and process of the water pump 200 supplying cooling water to the cylinder 500 will be described in detail with reference to the accompanying drawings.

[0068] As Figure 1 shown, the cylinder 500 is provided with an exhaust port 510 and a first cooling channel (not shown in the figure). The exhaust port 510 is used for discharging gas. The exhaust port 510 is connected to an exhaust pipe. Cooling water flows in the first cooling channel. A cylinder bore is formed in the cylinder 500, and the first cooling channel is arranged around the cylinder bore. The top of the crankcase 100 is spaced a predetermined distance from the exhaust port 510, that is, as Figure 1 shown, the top of the crankcase 100 is spaced a certain distance from the exhaust port 510 in the up and down direction, so there will also be a certain distance between it and the exhaust pipe.

[0069] One end of the cylinder water inlet pipe 600 is connected to the water pump 200. The cylinder water inlet pipe 600 is fixedly attached to the crankcase 100. The other end of the cylinder water inlet pipe 600 communicates with the first cooling channel. The cylinder water inlet pipe 600 is fixedly attached to the crankcase 100, which can further effectively separate the cylinder water inlet pipe 600 from the exhaust pipe, effectively increase the spacing distance between the two, so as to avoid the high-temperature exhaust pipe affecting the low-temperature cylinder water inlet pipe 600, further improve the cooling effect of the engine 1000, and then ensure the working reliability of the engine 1000 and improve the fuel efficiency of the engine 1000. There is no need to keep an effective distance between the inlet pipe and the crankcase as in the prior art, and due to space limitations, it is easy to be close to the exhaust pipe.

[0070] Specifically, the crankcase 100 includes a second cooling channel 118. The second cooling channel 118 communicates with the first cooling channel. That is to say, cooling water flows in both the second cooling channel 118 and the first cooling channel, and the cooling water in the second cooling channel 118 can be supplied to the first cooling channel. That is to say, the cylinder water inlet pipe 600 does not directly communicate with the first cooling channel, but communicates through the second cooling channel 118. The cooling water pumped out from the water pump 200 needs to pass through the cylinder water inlet pipe 600 and the second cooling channel 118 in sequence and then enter the first cooling channel for cooling. The cooling water in the first cooling channel can also flow back to the water pump 200.

[0071] Thus, the cylinder water inlet pipe 600 does not need to contact the cylinder 500. It can transfer the cooling water through the second cooling channel 118, that is, it can be separated by the second cooling channel 118, reducing the influence of high-temperature exhaust gas on the water inlet pipe, further improving the cooling effect of the engine 1000, and then ensuring the working reliability of the engine 1000 and improving the fuel efficiency of the engine 1000.

[0072] Optionally, as Figure 1 shown, the cylinder water inlet pipe 600 includes: a first connecting pipe 610 and a second connecting pipe 620. The first connecting pipe 610 is bent, and both ends of the first connecting pipe 610 are respectively connected to the water pump 200 and one end of the second connecting pipe 620. The second connecting pipe 620 is attached to the outer surface of the crankcase 100 and extends obliquely. By bending the first connecting pipe 610, its orientation can be changed, so that it can be effectively connected between the water pump 200 and the second connecting pipe 620, and it is beneficial for the second connecting pipe 620 to be attached and fixed to the surface of the crankcase 100, thus better away from the exhaust pipe and improving the cooling effect of the cooling water on the engine 1000. The obliquely arranged second connecting pipe 620 can further reduce its extension length and better connect to the second cooling channel 118.

[0073] Among them, as Figure 1 shown, the pipe wall of the second connecting pipe 620 is provided with an opening, and the crankcase 100 closes this opening. That is to say, the second connecting pipe 620 is provided with an opening facing the crankcase 100, and the crankcase 100 closes this opening. That is, the second connecting pipe 620 is not only open at both ends but also open on the side facing the crankcase 100. The two ends are mainly used to connect the first connecting pipe 610 and the second cooling channel 118. The opening on the side facing the crankcase 100 can facilitate its fixed connection to the top of the crankcase 100, and can make it more flattened, better away from the exhaust pipe, and better reduce the temperature of the cylinder 500. Among them, a gasket is provided between the open side of the second connecting pipe 620 facing the top of the crankcase 100 and the top of the crankcase 100. This gasket can effectively seal the gap between the two and avoid the leakage of the coolant. The gasket is a rubber gasket. Of course, the second connecting pipe 620 can also adopt other arrangement methods. For example, a sealing bottom wall can be provided on the side of the second connecting pipe 620 facing the crankcase 100. This sealing bottom wall has a bottom plane and can be flatly attached to the top wall of the crankcase 100.

[0074] Specifically, the first connecting pipe 610 can be a rubber pipe, and the second connecting pipe 620 can be an aluminum alloy pipe. The rubber pipe is easy to deform, can be bent, and can also well connect the impeller cavity 114 of the water pump 200 and the second connecting pipe 620. The second connecting pipe 620 near the exhaust port 510 is set as an aluminum alloy pipe. The aluminum alloy pipe has high structural strength and is not prone to high-temperature deformation like the rubber pipe affected by the temperature of the exhaust pipe. Moreover, the aluminum alloy pipe can be better attached and fixed to the top of the crankcase 100.

[0075] Optionally, as Figure 1 shown, the crankcase 100 includes: a box body 110 and a sealing cover 115. The sealing cover 115 is arranged on the top of the box body 110, and the sealing cover 115 is spaced from the cylinder 500. The second connecting pipe 620 is attached and fixed to the sealing cover 115. The sealing cover 115 can be fixed to the box body 110 through a fastener 270. Of course, the cylinder 500 is fixed directly above the box body 110, and the sealing cover 115 can be arranged obliquely above the box body 110. Moreover, by providing the sealing cover 115, the layout difficulty of the second connecting pipe 620 in the crankcase 100 can be further reduced, and the second connecting pipe 620 can be easily arranged and fixed on the sealing cover 115.

[0076] Among them, the sealing cover 115 can be an aluminum alloy cover. Thus, the sealing cover 115 and the second connecting pipe 620 both adopt the same material. The aluminum alloy material has high structural strength and good heat dissipation effect. Such a setting can further facilitate the heat dissipation of the cooling water and improve the cooling effect of the engine 1000.

[0077] Optionally, as Figure 5 and Figure 6 shown, the sealing cover 115 is provided with a recess 116 corresponding to and communicating with the opening. The recess 116 can further enlarge the size of the second connecting pipe 620, and at the same time can also reduce to a certain extent the height of the second connecting pipe 620 protruding from the crankcase, so that a larger amount of cooling water can flow between the second connecting pipe 620 and the recess 116. Moreover, by providing the recess 116, the height of the second connecting pipe 620 can be reduced at least to a certain extent, making it farther away from the exhaust pipe.

[0078] Further, as Figure 5 and Figure 6 shown, the sealing cover 115 is provided with a water passage port 117, and the water passage port 117 communicates between the second connecting pipe 620 and the second cooling channel 118. Thus, the connection structure between the second connecting pipe 620 and the second cooling channel 118 can be further simplified, and it is convenient for the cooling water to flow between the two. Also, as Figure 5As shown, the housing 110 has a first joint surface and a second joint surface 110b. The first joint surface is combined with the cylinder 500, and the second joint surface 110b is combined with the sealing cover 115. The water inlet of the second cooling channel 118 is formed on the second joint surface 110b, and the water outlet is formed on the first joint surface. The water inlet is arranged on one side of the second joint surface 110b adjacent to the first joint surface. With such an arrangement, the volume of the second cooling channel 118 is relatively small, which can reduce the space it occupies in the housing 110, and can shorten the connection path with the first cooling channel, making the water circuit layout more reasonable.

[0079] The end of the first connecting pipe 610 is sleeved on the end of the second connecting pipe 620, and a clamp is provided outside the end of the first connecting pipe 610. The sleeving method is convenient for installation on the one hand, and can ensure the connection tightness between the first connecting pipe 610 and the second connecting pipe 620 on the other hand. The setting of the clamp can also make the end of the first connecting pipe 610 and the end of the second connecting pipe 620 fixed reliably.

[0080] Among them, as Figure 3 As shown, the engine 1000 may further include: a generator 300, which is fixed on the second axial side of the crankcase 100. The generator 300 includes a rotor shaft, and the rotor shaft is connected to the crankshaft 120 and their axes are collinear. It can be understood that when the engine 1000 operates, the crankshaft 120 rotates, and the rotor shaft rotates accordingly to generate electricity. The generator 300 can be connected to a power battery and a motor, and the electricity generated by the generator 300 can be directly supplied to the motor to work, thereby realizing hybrid power and reducing the fuel consumption of the all-terrain vehicle.

[0081] The all-terrain vehicle according to an embodiment of the present invention includes the engine 1000 of the all-terrain vehicle in the above embodiment.

[0082] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0083] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0084] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0085] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An engine for an all-terrain vehicle, characterized in that: It includes: A cylinder, which is provided with an exhaust port and a first cooling channel; A crankcase, which is arranged below the cylinder; A water pump, which is arranged on one side of the crankcase; A cylinder water inlet pipe, one end of which is connected to the water pump, the cylinder water inlet pipe is fixedly attached to the crankcase, and the other end of the cylinder water inlet pipe is communicated with the first cooling channel; The cylinder water inlet pipe includes: a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is connected to the water pump, and the other end is connected to one end of the second connecting pipe. The second connecting pipe is fixedly attached to the crankcase. The first connecting pipe is bent, and the second connecting pipe extends obliquely; The crankcase includes: a box body and a sealing cover. The sealing cover is arranged on the box body, and the second connecting pipe is fixedly attached to the sealing cover; A second cooling channel is arranged in the box body. The sealing cover is provided with a water passing port, and the water passing port is communicated between the second connecting pipe and the second cooling channel. The second cooling channel is also communicated with the first cooling channel; The water pumped out from the water pump needs to pass through the cylinder water inlet pipe and the second cooling channel in sequence and then enter the first cooling channel for cooling.

2. The engine for an all-terrain vehicle according to claim 1, characterized in that: The first connecting pipe is a rubber pipe, and the second connecting pipe is an aluminum alloy pipe.

3. The engine for an all-terrain vehicle according to claim 1, characterized in that: An opening is arranged on the pipe wall of the second connecting pipe, and the opening is closed by the crankcase.

4. The engine for an all-terrain vehicle according to claim 3, characterized in that: The sealing cover is provided with a concave portion corresponding to and communicated with the opening.

5. The engine for an all-terrain vehicle according to claim 1, characterized in that: The box body has a first joint surface and a second joint surface. The first joint surface is combined with the cylinder, and the second joint surface is combined with the sealing cover. The water inlet of the second cooling channel is formed on the second joint surface and the water outlet is formed on the first joint surface. The water inlet is arranged on one side of the second joint surface adjacent to the first joint surface.

6. The engine for an all-terrain vehicle according to claim 1, characterized in that: The sealing cover is an aluminum alloy cover.

7. The engine for an all-terrain vehicle according to claim 1, characterized in that: The end of the first connecting pipe is sleeved on the end of the second connecting pipe and is externally provided with a clamp.

8. The engine for an all-terrain vehicle according to claim 1, characterized in that: It further includes: An oil cooler, which is arranged on the front side or the rear side of the crankcase. An oil cooler inlet pipe and an oil cooler return pipe are connected between the water pump and the oil cooler.

9. The engine for an all-terrain vehicle according to claim 1, characterized in that: The crankcase includes: a box cover, and the water pump includes: a pump housing. The box cover and the pump housing are integrally formed parts.

10. An all-terrain vehicle, characterized in that: The engine of the all-terrain vehicle according to any one of claims 1-9.

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