WO2021115446A1

WO2021115446A1 - All-terrain vehicle and engine thereof

Info

Publication number: WO2021115446A1
Application number: PCT/CN2020/135852
Authority: WO
Inventors: 张珍源; 蒋旭东
Original assignee: 赛格威科技有限公司
Priority date: 2019-12-13
Filing date: 2020-12-11
Publication date: 2021-06-17

Abstract

An engine (1000) of an all-terrain vehicle and an all-terrain vehicle. The engine comprises: a crankcase (100), the crankcase (100) comprising a case body (110), a crankshaft (120), and a balance shaft (130), the crankshaft (120) and the balance shaft (130) being provided in the case body (110), and the crankshaft (120) and the balance shaft (130) being in transmission; a water pump (200), the water pump (200) comprising a pump shaft (210), a shaft sleeve (220), and an impeller (230). An axial first end of the pump shaft (210) is fixedly connected to the balance shaft (130) or the crankshaft (120); the shaft sleeve (220) is fitted over the pump shaft (210); the impeller (230) is provided at an axial second end of the pump shaft (210) and abuts against the shaft sleeve (220), so that the impeller (230), the shaft sleeve (220), and the pump shaft (210) synchronously rotate.

Description

All-terrain vehicle and its engine

Cross-references to related applications

This application requires priority of the Chinese patent application number "201911283934.X" filed on December 13, 2019, entitled "All-terrain vehicle and its engine".

Technical field

The present disclosure relates to the technical field of all-terrain vehicles, and in particular to an all-terrain vehicle and its engine.

Background technique

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 cooling water circulation, and the oil pump is used for lubricating oil circulation. The oil pump shaft and the water pump shaft are generally equipped with transmission wheels. It is set at intervals, and then driven by the transmission wheel of the crankshaft.

Among them, when the engine is at idle speed, due to the low speed of the oil pump shaft and the low speed of the water pump shaft, the water pump cannot work normally, and the cooling water cannot be normally circulated in the cooling water channel of the engine, which is likely to cause poor engine cooling. It affects the working performance of the engine, and the water pump takes up a lot of space. Moreover, with the increase of engine speed and performance, the performance requirements for the water pump are getting higher and higher. Among them, the sealing performance and cost requirements of the water pump at high speed are getting higher and higher, and the water pump of this transmission mode can no longer meet the requirements.

Public content

The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, an objective of the present disclosure is to provide an all-terrain vehicle engine, which can increase the speed of the water pump, increase the pumping capacity, increase the corrosion resistance of the pump shaft, and reduce the volume and cost of the water pump.

The present disclosure further proposes an all-terrain vehicle.

The engine of the all-terrain vehicle according to the present disclosure includes: a crankcase, the crankcase includes: a case, a crankshaft, and a balance shaft, the crankshaft and the balance shaft are both arranged in the case, the crankshaft and the shaft The balance shaft transmission; a water pump, the water pump includes: a pump shaft, a shaft sleeve, and an impeller, the axial first end of the pump shaft is fixedly connected with the balance shaft or the crankshaft, and the shaft sleeve is sleeved on the pump shaft Above, the impeller is arranged at the second axial end of the pump shaft and abuts against the shaft sleeve, so that the impeller, the shaft sleeve and the pump shaft rotate synchronously.

Therefore, the balance shaft drives the pump shaft to rotate, which can increase the speed of the pump shaft and further improve the pumping capacity of the impeller. In this way, the size of the impeller can be reduced accordingly on the basis of ensuring sufficient pumping capacity. Reducing the volume of the water pump can be beneficial to the miniaturization design goal of the engine, and the installation of the shaft sleeve can ensure the installation reliability of the impeller, and it can also facilitate the contact between other components and the pump shaft.

In some examples of the present disclosure, the first axial end of the pump shaft is fixedly connected to the balance shaft, and the first axial end of the balance shaft is provided with an axially extending groove. An axially extending protrusion is provided at the first axial end, and the protrusion is fitted in the groove.

In some examples of the present disclosure, the protrusion and the groove are in clearance fit.

In some examples of the present disclosure, the bump is a non-circular bump, and the groove is a non-circular groove.

In some examples of the present disclosure, the protrusion is a flat block with a rectangular cross section, and the groove is a flat square groove with a rectangular cross section.

In some examples of the present disclosure, both ends in the width direction of the groove are open, and the two ends in the width direction of the protrusion protrude from both ends of the groove.

In some examples of the present disclosure, the outer peripheral surface of the pump shaft is provided with a circumferentially extending accommodating groove, and a sealing ring is provided in the accommodating groove, and the sealing ring abuts against the inner peripheral surface of the shaft sleeve.

In some examples of the present disclosure, the pump shaft includes: a first shaft section and a second shaft section, the first shaft section is connected to the second shaft section, and the outer diameter of the first shaft section is larger than that of the first shaft section. The outer diameter of the second shaft section and the connection between the first shaft section and the second shaft section are formed with a step, and the shaft sleeve and the impeller are sleeved on the second shaft section.

In some examples of the present disclosure, a first washer is provided at the step, and the sleeve abuts on the first washer.

In some examples of the present disclosure, the axial second end of the pump shaft is provided with a second washer and a fastener, and the fastener passes through the second washer to fix the impeller on the pump shaft. At the axial second end of the impeller, the second washer is located on the axial outer side of the impeller.

In some examples of the present disclosure, a tank cover is fixed on one side of the tank body, the tank cover is integrally formed with a pump housing of the water pump, and the pump housing is provided with an axially extending through hole, and the pump The shaft passes through the through hole.

In some examples of the present disclosure, the engine further includes: an oil seal, the oil seal sleeve is provided on the shaft sleeve and also abuts on the inner peripheral wall of the through hole, the shaft sleeve can be opposed to the oil seal Rotate.

In some examples of the present disclosure, there are two oil seals, and the two oil seals are spaced apart in the axial direction.

In some examples of the present disclosure, the engine further includes a cylinder, the cylinder is arranged above the crankcase, a first cooling passage is arranged in the cylinder, and a second cooling passage is arranged in the crankcase , The first cooling channel is communicated with the second cooling channel, and a cylinder water inlet pipe is arranged between the second cooling channel and the water pump.

In some examples of the present disclosure, the cylinder water inlet pipe includes: a first connecting pipe and a second connecting pipe. The first connecting pipe is bent and arranged, and two ends of the first connecting pipe are respectively connected to one end of the water pump and the second connecting pipe. , The second connecting pipe is attached to the outer surface of the crankcase, and the second connecting pipe is communicated with the second cooling passage.

In some examples of the present disclosure, the first connecting tube is a rubber tube, and the second connecting tube is an aluminum alloy tube.

In some examples of the present disclosure, the engine further includes a motor, the motor is fixed on the second axial side of the crankcase, the motor includes a rotor shaft, the rotor shaft is connected to the crankshaft and The axis is collinear.

In some examples of the present disclosure, the water pump is located at an end of the balance shaft, and the motor is located at an end of the crankshaft away from the water pump.

In some examples of the present disclosure, on a plane perpendicular to the crankshaft, the projections of the water pump and the motor at least partially overlap.

In some examples of the present disclosure, the electric machine is one of a motor, a generator, and a motor generator.

The all-terrain vehicle according to the present disclosure includes the engine of the all-terrain vehicle.

The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a perspective view of an engine according to an embodiment of the present disclosure;

Figure 2 is a side view of an engine according to an embodiment of the present disclosure;

Figure 3 is a cross-sectional view along the A-A direction in Figure 2;

Fig. 4 is an enlarged view of area B in Fig. 3;

Figure 5 is a perspective view of an engine according to an embodiment of the present disclosure, and exploded at the sealing cover;

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

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

Figure 8 is a perspective view of the box cover;

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

Reference signs:

Engine 1000;

Crankcase 100; box body 110; second joint surface 110b; box 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 passage 117 ; The second cooling channel 118; the cylinder water inlet interface 119;

Crankshaft 120; Balance shaft 130; Groove 131; Pump cover 140; Water pump inlet port 141; Cylinder return port 142; Oil cooler return port 143;

Water pump 200; pump shaft 210; protrusion 211; first shaft section 212; second shaft section 213;

Shaft sleeve 220; impeller 230; sealing ring 240; first gasket 250; second gasket 260; fastener 270; oil seal 280;

Generator 300; oil cooler 400; oil cooler inlet pipe 410; oil cooler return pipe 420;

Cylinder 500; exhaust port 510; cylinder water inlet pipe 600; first connecting pipe 610; second connecting pipe 620.

Detailed ways

The embodiments of the present disclosure are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present disclosure are described in detail below.

Hereinafter, an engine 1000 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 9, and the engine 1000 is applied to an ATV.

As shown in FIGS. 1 and 2, an engine 1000 according to an embodiment of the present disclosure 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 in the axial direction of the crankcase 100. For example, the water pump 200 can be installed on the left side of the crankcase 100, and the right side of the crankcase 100 can be adjusted according to the power type of the all-terrain vehicle. For example, the The all-terrain vehicle is a hybrid all-terrain vehicle, and the right side of the crankcase 100 can be provided with a generator 300, which can be electrically connected to the electric motor, and the electric motor outputs power to drive the all-terrain vehicle to move; The all-terrain vehicle is a pure fuel all-terrain vehicle, and a gearbox may be provided on the right side of the crankcase 100.

As shown in Figure 3, 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 case cover 111 is fixed on one side of the body 110, and a piston is arranged in the cylinder 500. The piston rod and the connecting rod connect the piston and the crankshaft 120, so that the reciprocating motion of the piston can be converted into the rotation of the crankshaft 120, the crankshaft 120 and the balance shaft 130 For transmission, the balance shaft 130 can effectively smooth the vibration of the engine 1000 and improve the performance of the engine 1000.

As shown in FIG. 3, the water pump 200 includes: a pump shaft 210, a shaft sleeve 220, and an impeller 230. The axial first 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 connected to the balance shaft 130. The left end of the pump shaft is fixedly connected, the shaft sleeve 220 is sleeved on the pump shaft 210, and the impeller 230 is provided on the second axial end of the pump shaft 210, that is, the left end of the pump shaft 210. In addition, 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. In other words, 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, and the impeller 230 can agitate the cooling water around it. So that cooling water is supplied to the corresponding parts to be cooled.

Therefore, the pump shaft 210 is driven to rotate by the balance shaft 130 or the crankshaft 120, which can increase the speed of the pump shaft 210 and further improve the pumping capacity of the impeller 230. In this way, the water pump 200 can correspondingly ensure sufficient pumping capacity. Reducing the size of the impeller 230 can further reduce the volume of the water pump 200, which can be beneficial to the miniaturization design goal of the engine 1000, and the use of the sleeve 220 can ensure the installation reliability of the impeller 230, and can improve the pump shaft 210 Corrosion resistance can also facilitate the contact between other components and the pump shaft 210.

According to an alternative embodiment of the present disclosure, as shown in FIG. 4, the axial first end of the pump shaft 210 is fixedly connected to the balance shaft 130, and the axial end of the balance shaft 130 is provided with an axially extending groove 131, The axial first end (ie, the right end) of the pump shaft 210 is provided with an axially extending protrusion 211, the protrusion 211 is fitted in the groove 131, and the protrusion 211 and the groove 131 are circumferentially limited. The matching method of the groove 131 and the protrusion 211 is simple and reliable, and can effectively perform circumferential limit, which can ensure the transmission stability of the balance shaft 130 and the pump shaft 210. Wherein, the bump 211 may be a sheet-like structure with a certain thickness, and the groove 131 corresponds to a long groove with a certain thickness, so that the circumferential limit of the bump 211 and the groove 131 can be effectively ensured.

Wherein, the bump 211 and the groove 131 can be clearance fit. The clearance fit can facilitate assembly, and can prevent the pump shaft 21 and the balance shaft 130 from having different shafts due to machining errors, and then jamming, thereby increasing the stability of the transmission.

Among them, as shown in FIG. 9, 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 thus arranged can use the protruding part of the protrusion 211 Cooperating with the part of the groove 131 can enable the balance shaft 130 and the pump shaft 210 to rotate synchronously, and it can also ensure that the two are coaxially arranged.

Further, as shown in FIG. 9, the protrusion 211 is a flat block, and the cross section of the protrusion 211 is a rectangle, the groove 131 is a flat square groove, and the cross section of the groove 131 is a rectangle. The convex block 211 and the groove 131 provided in this way have a simple structure and are easy to align during assembly, and can ensure the structural reliability of the pump shaft 210 and the balance shaft 130, and can further improve the cooperation reliability of the two.

Also, as shown in FIG. 9, both ends of the width direction of the groove 131 are open, and the two ends of the width direction of the protrusion 211 protrude from 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 thus arranged have a stable cooperation, and the structure of the protrusion 211 is relatively strong, which can avoid The bump 211 is deformed during the transmission process.

Further, as shown in FIG. 4, the outer peripheral 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 abuts against the inner peripheral surface of the shaft sleeve 220 . In other words, the sealing ring 240 is disposed between the pump shaft 210 and the shaft sleeve 220. By providing the sealing ring 240, the gap between the pump shaft 210 and the shaft sleeve 220 can be effectively sealed, and the inner cavity of the water pump 200 can be effectively separated from the inner cavity of the crankcase 100, so that the reliability of the engine 1000 can be improved.

4, 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 The outer diameter of the first shaft section 212 is greater than the outer diameter of the second shaft section 213, and the connection between the first shaft section 212 and the second shaft section 213 is formed with a step, and the shaft sleeve 220 and the impeller 230 are sleeved On the second shaft section 213. Therefore, the step can limit the axial position of the shaft sleeve 220 and the impeller 230, and at least to a certain extent can prevent the shaft sleeve 220 and the impeller 230 from moving axially. Moreover, the pump shaft 210 arranged in this way can also facilitate the sleeve installation of the shaft sleeve 220.

Furthermore, as shown in FIG. 4, a first washer 250 is provided at the step, and the shaft sleeve 220 abuts against the first washer 250. By arranging the first washer 250, the shaft sleeve 220 and the steps can be buffered, and the shaft sleeve 220 can be prevented from directly hitting the steps of the pump shaft 210 when the shaft sleeve 220 moves axially, thereby ensuring the structural reliability of the water pump 200. Moreover, the first gasket 250 can also be attached to the inner side wall of the pump housing 112 of the water pump 200, which can at least play a sealing role to a certain extent.

Optionally, as shown in FIG. 4, the axial second end of the pump shaft 210 is provided with a second washer 260 and a fastener 270, and the fastener 270 passes through the second washer 260 to fix the impeller 230 on the pump shaft 210. At the second axial end, the second washer 260 abuts against the impeller 230, and the second washer 260 is located on the axial outer side of the impeller 230. It can be understood that the end of the second shaft section 213 of the pump shaft 210 is provided with a threaded hole, the fastener 270 may be a bolt, and the bolt passes through the second washer 260 and then extends into the threaded hole, so that the fastener 270 can be The impeller 230 and the shaft sleeve 220 are fastened to the second shaft section 213, so that the impeller 230 and the shaft sleeve 220 can rotate synchronously with the second shaft section 213, and the pumping capacity of the impeller 230 can be ensured. The second gasket 260 can prevent the impeller 230 and the fastener 270 from directly contacting, and can effectively protect the impeller 230.

As shown in combination with FIG. 3 and FIG. 4, the box cover 111 is integrally formed with the pump housing 112 of the water pump 200, the pump housing 112 is provided with an axially extending through hole 113, and the pump shaft 210 penetrates through the through hole 113. By integrally forming the pump housing 112 on the tank cover 111, the process of setting the pump housing 112 and installing the pump housing 112 can be omitted, and the crankcase 100 and the water pump 200 can be made reliable in structure. The through hole 113 can facilitate the connection of the pump shaft 210 with the balance shaft 130 after passing through. By setting the inner diameter of the through hole 113 reasonably, it can also prevent the cooling water from entering the inner space of the box 110 to a certain extent. It should be noted that the axial first end of the pump shaft 210 can also be directly driven with the crankshaft 120 instead of the way it is driven with the balance shaft 130.

According to a specific embodiment of the present disclosure, as shown in FIG. 4, the engine 1000 may further include: an oil seal 280, the oil seal 280 is sleeved on the shaft sleeve 220, the shaft sleeve 220 is rotatable relative to the oil seal 280, and the outer circumference of the oil seal 280 is still abutting Connected to the inner peripheral wall of the via hole 113. The pump casing 112 also forms an impeller cavity 114 around the impeller 230, and there is flowing cooling water in the impeller cavity 114. The impeller 230 can pump the cooling water in the impeller cavity 114 into 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 cavity 114 from the internal space of the box 110. The oil seal 280 is more suitable for working at high speeds than the water seal, which can make the water pump 200 have a sealing effect. better. Also, the cost of the oil seal 280 is relatively low.

Specifically, as shown in FIG. 4, there are two oil seals 280, and the two oil seals 280 are arranged at intervals in the axial direction. By providing two oil seals 280, the sealing effect of the water pump 200 can be improved to 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 away from the impeller 230, so as to adapt to the size of the via 113 and better seal the water pump 200. .

Specifically, as shown in FIG. 4, the via 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 is connected to the first shaft section 212 of the pump shaft 210. Correspondingly, the small hole section 113b is in clearance fit with the first shaft section 212 of the pump shaft 210, so that the first shaft section 212 of the pump shaft 210 can rotate freely in the small hole section 113b, and the large hole section 113a corresponds to the pump shaft The second shaft section 213 of 210, so 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 facilitates the arrangement of some seals, For example, the oil seal 280 is arranged in the large hole section 113a, and 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 axial ends of the large hole section 113a, and the oil seals 280 abut Connected to the inner peripheral wall of the large hole section 113a. It is understandable that the oil seal 280 can be conveniently arranged by reasonably setting the large hole section 113a and the second shaft section 213 of the pump shaft 210, and the oil seal 280 can isolate the internal space of the impeller cavity 114 and the box body 110 at the joint of the two. , Prevent the moisture in the impeller cavity 114 from entering the inside of the box body 110, which can ensure the sealing reliability of the engine 1000.

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 at the outer step portion, and the other of the two oil seals 280 abuts at the inner step portion . The arrangement 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 improve the sealing effect of the oil seal 280, and can ensure the sealing reliability of the engine 1000.

According to an optional embodiment of the present disclosure, as shown in FIG. 1 and FIG. 4, an oil cooler 400 is provided on the outside of the box body 110, and the pump housing 112 is also formed with an impeller cavity 114 on the outside of the through hole 113. The impeller cavity 114 An oil cooler inlet pipe 410 is connected. The oil cooler 400 can cool the oil of some parts of the engine 1000, and the pump casing 112 can be provided with an interface connecting the oil cooler inlet pipe 410. By forming an impeller cavity 114 in the pump casing 112, it can also facilitate the installation of the impeller 230. Layout, and can facilitate the connection of the water inlet pipe 410 of the oil cooler. The oil cooler 400 is arranged on the front or 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, and the cold water in the impeller cavity 114 passes through the oil cooler inlet pipe 410 It enters into the oil cooler 400, fully exchanges heat with the lubricating oil, reduces the temperature of the lubricating oil, and finally returns water to the impeller cavity 114 of the water pump 200 through the oil cooler return pipe 420.

Among them, as shown in FIG. 1, the pump housing 112 is located at the edge of the tank cover 111. The position of the pump housing 112 provided in this way is reasonably arranged, which can reduce the manufacturing difficulty of the box cover 111, and it can be matched with the pump shaft 210 and the impeller 230.

Optionally, as shown in FIG. 1, a cylinder water inlet pipe 600 is connected between the impeller cavity 114 and the cylinder 500, and the interface connecting the impeller cavity 114 to the cylinder water inlet pipe 600 is arranged obliquely above the impeller cavity 114, that is, the interface is arranged on the pump The shell 112 corresponds to the obliquely above the position of the impeller cavity 114. By setting the cylinder water inlet pipe 600, the impeller cavity 114 can supply cooling water into 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 kept in a reasonable working temperature range, and by setting the interface Obliquely above the impeller cavity 114, the connection between the cylinder 500 and the impeller cavity 114 can be facilitated, and the length of the cylinder water inlet pipe 600 can be reduced, which can further simplify the difficulty of arranging the cylinder water inlet pipe 600.

According to a specific embodiment of the present disclosure, as shown in FIGS. 1 and 4, the box cover 111 is recessed toward the inner space to form a pump housing 112, and the pump cover 140 is fixed on the outside of the pump housing 112. The pump housing 112 is recessed inward to form a pump housing 112 with sufficient space at the tank cover 111. The pump housing 112 can arrange the impeller 230 and the pump shaft 210, and the outer pump cover 140 can effectively cover The space of the pump housing 112 can thereby ensure the sealing performance of the water pump 200.

Wherein, as shown in FIG. 8, the outer circumference of the through hole 113 is provided with an annular edge extending toward the outside of the box cover 111, the annular edge defines an impeller cavity 114, and at least a part of the impeller 230 is accommodated in the impeller cavity 114. In other words, the box cover 111 can extend an annular edge on its outer surface around the position of the through hole 113, and the annular edge can define an impeller cavity 114 for accommodating the impeller 230. The pump housing 112 thus arranged has a simple structure and can lower the box. The cover 111 is difficult to form and can effectively accommodate the impeller 230.

In addition, as shown in FIG. 8, the box cover 111 is also provided with a cylinder water inlet 119 on one side of the annular edge, and the cylinder water inlet 119 is in communication with the impeller cavity 114. In other words, the tank cover 111 is not only integrally formed with the pump housing 112, but also on this basis, is integrally formed with the cylinder water inlet port 119, so that there is no need to supplement the cylinder water inlet port 119 on the pump housing 112, which can further simplify The structure of the engine 1000 can also make the structure of the water pump 200 more reliable.

Specifically, as shown in FIG. 1, the pump cover 140 is provided with a water pump inlet port 141, a cylinder water return port 142, and an oil cooler back water port 143, a water pump water inlet port 141, a cylinder water return port 142, and an oil cooler. The return water interface 143 is connected, and the pump cover 140 is also provided with stiffeners, which extend from the edge of the pump cover 140 to the connections of the water pump inlet 141, the cylinder return interface 142, and the oil cooler return interface 143. Therefore, the pump cover 140 integrates three ports, and the cooling water at the three ports can enter the impeller cavity 114 and then supply the corresponding components for cooling. The arrangement 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.

Optionally, a visible tube is also provided on the pump casing 112, one end of the visible tube is connected to the impeller cavity 114, and the other end is closed. Visible pipe is a transparent pipe through which the outside can directly see the internal cooling water, which can facilitate the user to monitor the water quality in the water pump 200, so as to know the water quality in the entire circulation loop, and facilitate the user to replace the cooling water in time, thereby ensuring The working stability of the engine 1000.

The structure and process of the water pump 200 supplying cooling water to the cylinder 500 will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, the cylinder 500 is provided with an exhaust port 510 and a first cooling passage (not shown in the figure). The exhaust port 510 is used for exhausting gas. The exhaust port 510 is connected with an exhaust pipe. Cooling water flows, a cylinder hole is formed in the cylinder 500, and the first cooling passage is arranged around the cylinder hole. The top of the crankcase 100 and the exhaust port 510 are separated by a predetermined distance, that is, as shown in FIG. 1, the top of the crankcase 100 and the exhaust port 510 are separated by a certain distance in the up and down direction, so that there will be a distance between the top of the crankcase 100 and the exhaust pipe. A certain distance.

One end of the cylinder water inlet pipe 600 is connected to the water pump 200, the cylinder water inlet pipe 600 is attached and fixed on the crankcase 100, and the other end of the cylinder water inlet pipe 600 communicates with the first cooling passage. The cylinder water inlet pipe 600 is attached and fixed on the crankcase 100, which can further effectively separate the cylinder water inlet pipe 600 and the exhaust pipe, which can effectively increase the separation distance between the two, thereby avoiding high temperature exhaust. The air pipe affects the low-temperature cylinder water inlet pipe 600, which can further improve the cooling effect of the engine 1000, thereby ensuring the working reliability of the engine 1000 and improving the fuel efficiency of the engine 1000. There is no need for the effective distance between the inlet pipe and the crankcase in the prior art, plus the space limitation, so it is easy to approach the exhaust pipe.

Specifically, the crankcase 100 includes a second cooling channel 118, which communicates with the first cooling channel, that is, cooling water flows between the second cooling channel 118 and the first cooling channel, and the second cooling channel 118 is connected to the first cooling channel. The cooling water in the cooling passage 118 may be supplied to the first cooling passage. In other words, the cylinder water inlet pipe 600 is not directly connected to the first cooling channel, but is communicated through the second cooling channel 118. The cooling water pumped from the water pump 200 needs to pass through the cylinder water inlet pipe 600 and the second cooling channel 118 in sequence. After entering the first cooling channel for cooling, the cooling water in the first cooling channel can be returned to the water pump 200 again.

Therefore, the cylinder water inlet pipe 600 does not need to be in contact with the cylinder 500, and the cooling water can be transferred through the second cooling channel 118, that is, it can be separated by the second cooling channel 118, which reduces the influence of high-temperature exhaust on the water inlet pipe and can further Therefore, the cooling effect of the engine 1000 can be improved, so that the working reliability of the engine 1000 can be ensured, and the fuel efficiency of the engine 1000 can be improved.

Optionally, as shown in FIG. 1, 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 arranged, and the two 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 the second connecting pipe 620 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 the second connecting pipe 620 can be attached and fixed to the crankcase. The surface of 100 can be better far away from the exhaust pipe, and the effect of cooling the engine 1000 by the cooling water can be improved. The inclined second connecting pipe 620 can also further reduce its extension length, and can better connect the second cooling channel 118.

Wherein, as shown in FIG. 1, the pipe wall of the second connecting pipe 620 is provided with an opening, and the crankcase 100 closes the opening. That is, the second connecting pipe 620 is provided with an opening that opens toward the crankcase 100, and the crankcase 100 closes the opening. That is, the second connecting pipe 620 is not only open at both ends, but also open toward the side of the crankcase 100. Both ends are mainly used to connect the first connecting pipe 610 and the second cooling passage 118, and are open toward the side of the crankcase 100. It can be conveniently fixedly connected with the top of the crankcase 100, and can be made more flat, can be better far away from the exhaust pipe, and can better reduce the temperature of the cylinder 500. Wherein, 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, and the gasket can effectively seal the gap between the two and avoid the leakage of coolant. The gasket is a rubber gasket. Of course, the second connecting pipe 620 can also be arranged in other ways. For example, the side of the second connecting pipe 620 facing the crankcase 100 can be provided with a sealed bottom wall. The sealed bottom wall has a bottom plane and can be flatly attached to it. On the top wall of the crankcase 100.

Specifically, the first connecting tube 610 may be a rubber tube, and the second connecting tube 620 may be an aluminum alloy tube. The rubber tube is easy to deform, can be bent, and can also be well connected to 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 tube. The pipe structure has high strength, unlike rubber pipes that are susceptible to high temperature deformation due to the temperature of the exhaust pipe, and the aluminum alloy pipe can be better attached and fixed on the top of the crankcase 100.

Optionally, as shown in FIG. 1, 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 apart from the cylinder 500, and the second connecting pipe 620 is attached The device is fixed on the sealing cover 115. The sealing cover 115 can be fixed on the box body 110 by 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 difficulty of arranging 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.

Wherein, the sealing cover 115 may be an aluminum alloy cover. Therefore, the sealing cover 115 and the second connecting pipe 620 are made of the same material, and the aluminum alloy material has high structural strength and good heat dissipation effect. This arrangement can further facilitate the heat dissipation of the cooling water and improve the cooling effect of the engine 1000.

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

Furthermore, as shown in FIGS. 5 and 6, the sealing cover 115 is provided with a water passage 117, and the water passage 117 is connected between the second connecting pipe 620 and the second cooling passage 118. Therefore, the connection structure between the second connecting pipe 620 and the second cooling passage 118 can be further simplified, and the cooling water can flow between the two conveniently. Also, as shown in FIG. 5, the box body 110 has a first coupling surface and a second coupling surface 110b, the first coupling surface is coupled with the cylinder 500, the second coupling surface 110b is coupled with the sealing cover 115, and the second cooling channel The water inlet of 118 is formed on the second joining surface 110b, and the water outlet is formed on the first joining surface, and the water inlet is arranged on the side of the second joining surface 110b adjacent to the first joining surface. The second cooling channel 118 thus arranged has a small volume, which can reduce the space occupied by the box body 110, and can shorten the communication path between the second cooling channel 118 and the first cooling channel, and can make the water circuit arrangement more reasonable.

The end of the first connecting pipe 610 is sleeved on the end of the second connecting pipe 620, and the end of the first connecting pipe 610 is provided with a clamp. On the one hand, the sleeve connection is convenient for installation, and on the other hand, it can ensure the connection and tightness of the first connecting pipe 610 and the second connecting pipe 620. The arrangement of the clamp can also make the end of the first connecting pipe 610 and the second The ends of the second connecting pipe 620 are reliably fixed.

Wherein, as shown in FIG. 3, the engine 1000 may further include a motor 300, which is fixed on the second axial side of the crankcase 100, and the motor 300 includes a rotor shaft which is connected to the crankshaft 120 and has a collinear axis. The motor 300 can be a generator. It can be understood that when the engine 1000 is working, the crankshaft 120 rotates and the rotor shaft rotates accordingly to generate electricity. The motor 300 can be connected to a power battery and an electric motor, and the electricity generated by the motor 300 can be directly supplied to the motor to work. , So as to achieve hybrid, can reduce the fuel consumption of all-terrain vehicles. Of course, the motor 300 can also be a motor or a motor generator.

The water pump 200 is connected to one end of the balance shaft 130, and the motor 300 is located at the end of the crankshaft 120 away from the water pump 200. The water pump 200 and the motor 300 arranged in this way are distributed on the left and right sides of the crankcase 100, which can make the structural layout of the engine 1000 reasonable, can make the lateral load distribution uniform, and have higher stability.

On a plane perpendicular to the crankshaft 120, the projections of the water pump 200 and the motor 300 at least partially overlap. In other words, in the axial direction, there is a relative area between the water pump 200 and the motor 300, which can further improve the overall stability of the engine 1000.

The all-terrain vehicle according to the embodiment of the present disclosure includes the engine 1000 of the all-terrain vehicle of the above-mentioned embodiment.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

An all-terrain vehicle engine, which is characterized in that it comprises:

A crankcase, the crankcase comprising: a case, a crankshaft, and a balance shaft, the crankshaft and the balance shaft are both arranged in the case, and the crankshaft and the balance shaft drive;

A water pump, the water pump comprising: a pump shaft, a shaft sleeve and an impeller, the axial first end of the pump shaft is fixedly connected with the balance shaft or the crankshaft, the shaft sleeve is sleeved on the pump shaft, and the impeller It is arranged at the second axial end of the pump shaft and stops against the shaft sleeve, so that the impeller, the shaft sleeve and the pump shaft rotate synchronously.
The all-terrain vehicle engine according to claim 1, wherein the axial first end of the pump shaft is fixedly connected to the balance shaft, and the axial first end of the balance shaft is provided with an axial extension The first axial end of the pump shaft is provided with an axially extending protrusion, and the protrusion is fitted in the groove.
The engine of the all-terrain vehicle according to claim 2, wherein the protrusion and the groove are in clearance fit.
The all-terrain vehicle engine according to claim 2, wherein the protrusion is a non-circular protrusion, and the groove is a non-circular groove.
The all-terrain vehicle engine according to claim 4, wherein the protrusion is a flat block with a rectangular cross section, and the groove is a flat square groove with a rectangular cross section. The two ends of the convex block are open, and the two ends of the convex block in the width direction protrude from the two ends of the groove.
The all-terrain vehicle engine according to claim 1, wherein the outer peripheral surface of the pump shaft is provided with a circumferentially extending accommodating groove, and a sealing ring is provided in the accommodating groove, and the sealing ring abuts against the The inner peripheral surface of the sleeve.
The all-terrain vehicle engine according to claim 1, wherein the pump shaft comprises: a first shaft section and a second shaft section, the first shaft section and the second shaft section are connected, the The outer diameter of the first shaft section is greater than the outer diameter of the second shaft section, and a step is formed at the connection between the first shaft section and the second shaft section, and the shaft sleeve and the impeller are sleeved on the Said on the second shaft section.
The engine of the all-terrain vehicle according to claim 7, characterized in that a first washer is provided at the step, and the shaft sleeve abuts against the first washer.
The all-terrain vehicle engine according to claim 7, wherein the axial second end of the pump shaft is provided with a second washer and a fastener, and the fastener passes through the second washer to The impeller is fixed on the axial second end of the pump shaft, and the second washer is located on the axial outer side of the impeller.
The all-terrain vehicle engine according to claim 1, wherein a tank cover is fixed on one side of the tank body, and the tank cover is integrally formed with a pump housing of the water pump, and the pump housing is provided with a shaft A through hole extending in the direction, the pump shaft penetrates through the through hole.
The all-terrain vehicle engine according to claim 10, further comprising: an oil seal, the oil seal is sleeved on the shaft sleeve and also abuts on the inner peripheral wall of the through hole, and the shaft The sleeve is rotatable relative to the oil seal.
The all-terrain vehicle engine according to claim 11, wherein there are two oil seals, and the two oil seals are arranged at intervals in the axial direction.
The all-terrain vehicle engine according to claim 1, further comprising: a cylinder, the cylinder is arranged above the crankcase, the cylinder is provided with a first cooling passage, and the crankcase is A second cooling channel is provided, the first cooling channel is communicated with the second cooling channel, and a cylinder water inlet pipe is arranged between the second cooling channel and the water pump.
The all-terrain vehicle engine according to claim 13, wherein the cylinder water inlet pipe comprises: a first connecting pipe and a second connecting pipe, the first connecting pipe is bent and arranged, and both ends of the first connecting pipe are respectively One end of the water pump and the second connecting pipe is connected, the second connecting pipe is attached to the outer surface of the crankcase, and the second connecting pipe is communicated with the second cooling passage.
The engine of the all-terrain vehicle according to claim 14, wherein the first connecting tube is a rubber tube, and the second connecting tube is an aluminum alloy tube.
The all-terrain vehicle engine according to claim 1, further comprising: a motor, the motor is fixed on the second axial side of the crankcase, the motor includes a rotor shaft, the rotor shaft and The crankshafts are connected and their axes are collinear.
The all-terrain vehicle engine according to claim 16, wherein the water pump is located at one end of the balance shaft, and the crankshaft of the electric motor is at an end away from the water pump.
The engine of the all-terrain vehicle according to claim 17, wherein on a plane perpendicular to the crankshaft, the projections of the water pump and the electric motor at least partially overlap.
The engine of the all-terrain vehicle according to claim 16, wherein the electric motor is one of a motor, a generator, and a motor generator.
An all-terrain vehicle, characterized by comprising the engine of the all-terrain vehicle according to any one of claims 1-19.