Engines and ATVs

Abstract

The present invention discloses an engine and an all-terrain vehicle. The engine includes a crankcase, the crankcase including a housing and an oil pan, the oil pan being mounted at the bottom of the housing, the housing having an oil inlet passage, an oil cavity, and an oil outlet passage, the oil cavity being disposed between the oil inlet passage and the oil outlet passage, the oil inlet passage connecting the oil cavity and the oil pan, and an oil cooler disposed within the oil inlet passage. Thus, by disposing the oil cooler within the oil inlet passage, the lubricating oil pressure in the oil outlet passage is eliminated, thereby facilitating the smooth flow of lubricating oil to the surfaces of each moving pair, ensuring the lubrication effect of each moving pair, and improving the operating reliability of the engine.

Description

Technical Field

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

[0002] In the related art, the engine can convert the internal energy generated by fuel combustion into mechanical energy through the coordinated action of multiple moving pairs, thereby driving the vehicle on the road. Among them, in order to ensure the working reliability of multiple moving pairs, multiple moving pairs need to be lubricated with lubricating oil. The commonly used lubrication method is to use an oil pump to pump the lubricating oil in the oil pan and then supply it to the surface of each moving pair. Since the lubricating oil has thermal conductivity, an oil cooler is generally provided in the oil circuit to reduce the temperature of the lubricating oil. However, since the oil cooler is provided in the oil supply line, it causes loss of oil pressure, insufficient oil supply power, and poor oil supply stability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an engine with low oil pressure loss in the oil outlet channel, which can ensure sufficient oil supply power and good lubrication effect.

[0004] The present invention further provides an all-terrain vehicle.

[0005] According to the present invention, the engine includes: a crankcase, the crankcase includes: a case body and an oil pan, the oil pan is installed at the bottom of the case body, an oil inlet passage, an oil cavity and an oil outlet passage are formed in the case body, the oil cavity is arranged between the oil inlet passage and the oil outlet passage, and the oil inlet passage connects the oil cavity and the oil pan; an oil cooler, the oil cooler is arranged in the oil inlet passage.

[0006] Therefore, by setting the oil cooler in the oil inlet channel, there is no need to lose the lubricating oil pressure in the oil outlet channel, which can facilitate the smooth flow of lubricating oil to the surface of each moving pair, ensure the lubrication effect of each moving pair, and improve the working reliability of the engine.

[0007] In some examples of the present invention, the oil chamber includes: a first oil chamber and a second oil chamber that are connected to each other, the first oil chamber is arranged between the oil inlet channel and the second oil chamber, the second oil chamber is connected to the oil outlet channel, and the oil cooler is arranged between the oil inlet channel and the first oil chamber.

[0008] In some examples of the present invention, the box body includes: a main body, a first box cover and a second box cover, the lateral surface of the main body is formed with an open first oil chamber and a second oil chamber, the first box cover is arranged on the open side of the first oil chamber, the second box cover is arranged on the open side of the second oil chamber, and the oil cooler is arranged on the second box cover.

[0009] In some examples of the present invention, the main body includes: a first main body and a second main body, the second main body is installed between the first main body and the oil pan, the first oil chamber is formed on one side of the first main body, the second oil chamber is formed on the second main body, and a plurality of first oil holes are correspondingly formed at the bottom of the first main body and the top of the second main body.

[0010] In some examples of the present invention, the second tank cover includes: a flat plate portion and a raised portion, the raised portion is provided on one side of the flat plate portion and is higher than the flat plate portion, and the oil cooler is provided on the flat plate portion.

[0011] In some examples of the present invention, the second main body is provided with a first oil inlet passage and a fourth oil inlet passage, the second tank cover is provided with a second oil inlet passage and a third oil inlet passage, the second oil inlet passage is provided between the first oil inlet passage and the oil inlet port of the oil cooler, and the third oil inlet passage is provided between the oil outlet of the oil cooler and the fourth oil inlet passage.

[0012] In some examples of the present invention, the first body is provided with a first oil inlet pipe communicating with the first oil chamber, and the first oil inlet pipe is communicated with the fourth oil inlet passage.

[0013] In some examples of the present invention, the crankcase further includes: a first oil pump and a second oil pump, the first oil pump being disposed between the oil pan and the oil inlet passage, and the second oil pump being disposed between the oil chamber and the oil outlet passage.

[0014] In some examples of the present invention, the oil outlet channel includes: a first oil outlet channel, a first oil outlet pipe and a second oil outlet channel, the first oil outlet channel connects the oil chamber and one end of the first oil outlet pipe, and the other end of the first oil outlet pipe is connected to the second oil outlet channel.

[0015] In some examples of the present invention, the crankcase further includes: an oil filter, the oil filter being disposed on one side of the case, the oil outlet passage including a third oil outlet passage, the third oil outlet passage being connected between the first oil outlet pipe and the oil filter, and the oil filter being connected to the second oil outlet passage.

[0016] In some examples of the present invention, the housing further includes: a third housing cover, the third housing cover being arranged on one axial side of the housing, the third housing cover being provided with a fourth oil outlet passage and a fifth oil outlet passage, the fourth oil outlet passage being connected to the third oil outlet passage and the oil filter, and the fifth oil outlet passage being connected to the oil filter and the second oil outlet passage.

[0017] The all-terrain vehicle according to the present invention comprises: the engine described above.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 is a schematic structural diagram of an engine according to an embodiment of the present invention, and shows the structure of an oil outlet passage;

[0021] Figure 2 It is a schematic diagram of the crankcase structure, and shows the structure of the oil inlet passage;

[0022] Figure 3 is a cross-sectional view of the crankcase, showing the structure of the oil inlet passage;

[0023] Figure 4 is a structural diagram of the second body;

[0024] Figure 5 2. It is a structural diagram of the second main body and the second box cover;

[0025] Figure 6 This is an exploded view of the box;

[0026] Figure 7 It is a cross-sectional view of the main body;

[0027] Figure 8 is a structural diagram of the second body;

[0028] Figure 9 1. It is a structural diagram of the pressure relief valve and the second body;

[0029] Figure 10 is a structural schematic diagram of the first oil outlet pipe and the first main body;

[0030] Figure 11 It is a structural diagram of the third box cover;

[0031] Figure 12 is a side view schematic diagram of the first subject;

[0032] Figure 13 is a cross-sectional view of the first body, and shows the second oil outlet passage;

[0033] Figure 14 It is a structural diagram of the third tank cover and oil filter;

[0034] Figure 15 1. It is a schematic diagram of the structure of the first oil pump and the second oil pump;

[0035] Figure 16 It is a structural diagram of the oil pan.

[0036] Reference numerals:

[0037] Engine 1000;

[0038] Crankcase 100; case 110; main body 111; first case cover 112; second case cover 113; first main body 114; second main body 115; first inclined surface 116; second inclined surface 117; third case cover 118; water pump shaft mounting hole 119; crankshaft mounting hole 120; balance shaft mounting hole 121; flat plate 122; raised portion 123; oil pan 124; first filter mounting hole 125; pressure relief valve mounting hole 126;

[0039] Oil chamber 130; first oil chamber 131; second oil chamber 132; first oil hole 133;

[0040] Oil outlet passage 140; first oil outlet passage 141; oil inlet 141a of the first oil outlet passage; oil outlet 141b of the first oil outlet passage; first transfer port 141c of the first oil outlet passage; second transfer port 141d of the first oil outlet passage;

[0041] First oil outlet pipe 142; second oil outlet passage 143; oil inlet 143a of the second oil outlet passage; pressure relief valve 144; third oil outlet passage 145; oil inlet 145a of the third oil outlet passage; oil outlet 145b of the third oil outlet passage; fourth oil outlet passage 146; fifth oil outlet passage 147; sixth oil outlet passage 148; seventh oil outlet passage 149; eighth oil outlet passage 150; oil quality monitoring pipe 151;

[0042] Oil inlet passage 160; first oil inlet passage 161; oil inlet port 161a of the first oil inlet passage; oil outlet port 161b of the first oil inlet passage; second oil inlet passage 162; third oil inlet passage 163; fourth oil inlet passage 164; oil inlet port 164a of the fourth oil inlet passage; first oil inlet pipe 165;

[0043] First oil pump 200; second filter 210; second oil pump 300; first filter 310;

[0044] Oil filter 400; oil cooler 500. DETAILED DESCRIPTION

[0045] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0046] Reference below Figures 1-16 An engine 1000 according to an embodiment of the present invention is described, and the engine 1000 is applied to an all-terrain vehicle.

[0047] like Figure 1 and Figure 2 As shown, the engine 1000 according to an embodiment of the present invention may include: a crankcase 100, a first oil pump 200 and a second oil pump 300. The first oil pump 200 and the second oil pump 300 are both arranged in the crankcase 100, and the first oil pump 200 and the second oil pump 300 can cooperate in the crankcase 100, so as to continuously and stably supply lubricating oil to each moving pair of the engine 1000, ensure the lubrication effect of each moving pair, and extend the service life of the engine 1000.

[0048] like Figures 1 to 6 As shown, crankcase 100 includes a housing 110 and an oil pan 124. Oil pan 124 is mounted at the bottom of housing 110 and is used to hold a portion of lubricating oil. Housing 110 includes an oil inlet 160, an oil chamber 130, and an oil outlet 140. Oil inlet 160 communicates with oil chamber 130 and oil pan 124 to draw lubricating oil from oil pan 124 upward into oil chamber 130. Oil chamber 130 communicates with oil outlet 140. In other words, crankcase 100 of the present invention, in addition to oil pan 124, also includes an oil chamber 130 for storing lubricating oil on housing 110. Oil chamber 130 can replace a conventional oil pan and serve as an oil storage facility. This not only increases the height of the oil storage area of ​​engine 1000 but also reduces the depth of oil pan 124, thereby reducing the size of engine 1000 and improving the maneuverability of the all-terrain vehicle.

[0049] In addition, since the oil chamber 130 is arranged on the box body 110, the position of the oil chamber 130 is higher than the second oil pump 300. This can avoid the second oil pump 300 from being sucked empty due to vehicle shaking as much as possible, ensure the stable supply of lubricating oil to each moving part, and improve the lubrication effect of the engine 1000.

[0050] like Figure 16 As shown, the oil pan 124 may be a dry type oil pan. The dry type oil pan 124 has a small depth, which can reduce the depth of the oil pan 124 and the design size of the engine 1000, thereby facilitating the rational arrangement of other components of the vehicle.

[0051] Among them, Figure 1 and Figure 2As shown, a first oil pump 200 is disposed between the oil pan 124 and the oil chamber 130. The first oil pump 200 is used to pump the lubricating oil in the oil pan 124 into the oil chamber 130. A second oil pump 300 is disposed between the oil chamber 130 and the oil outlet passage 140. The second oil pump 300 is used to pump the lubricating oil in the oil chamber 130 into the oil outlet passage 140, and then supply the lubricating oil to the surfaces of the various kinematic pairs through the oil outlet passage 140. In other words, the engine 1000 of the present invention primarily utilizes the oil chamber 130 for oil storage and supply. After the lubricating oil that has lubricated the kinematic pairs freely falls into the oil pan 124, the first oil pump 200 can pump it into the oil chamber 130, eliminating the need for the oil pan 124 to store a large amount of oil.

[0052] Therefore, the present invention adopts a dual oil pump approach, wherein the first oil pump 200 is used to pump the lubricating oil in the oil pan 124 into the oil chamber 130, thereby ensuring sufficient oil storage in the oil chamber 130, and the second oil pump 300 can pump the lubricating oil in the oil chamber 130 and supply it to the surface of each moving pair, thereby ensuring the lubrication effect of each moving pair, and compared with the single oil pump approach, the dual oil pump approach can at least to a certain extent avoid the problem of unstable oil pressure, and can ensure continuous and stable oil supply to each moving pair, thereby reducing the wear of each moving pair, improving the working stability of the engine 1000, and extending the service life of the engine 1000.

[0053] In addition, the oil chamber 130 configured in this way can at least to a certain extent reduce the impact of vehicle bumps and shakes on the lubricating oil, and can ensure that the oil chamber 130 continues to supply oil to the second oil pump 300.

[0054] According to a specific embodiment of the present invention, Figure 6 As shown, the oil chamber 130 comprises a first oil chamber 131 and a second oil chamber 132. The first oil pump 200 is connected to the first oil chamber 131, which in turn is connected to the second oil chamber 132. The second oil pump 300 is positioned between the second oil chamber 132 and the oil outlet 140. In other words, the oil chamber 130 is composed of two interconnected chambers 130. This allows the lubricating oil supplied by the first oil pump 200 to first enter the first oil chamber 131 and then pass through the first oil chamber 131 into the second oil chamber 132. This compartmentalized arrangement effectively prevents large fluctuations in the oil level in the second oil chamber 132 when the ATV is navigating bumpy roads, cornering, braking, or accelerating. Consequently, the second oil pump 300 never runs out of oil, ensuring continuous oil supply to each moving joint and ensuring effective lubrication.

[0055] In addition, since the first oil chamber 131 is provided, the lubricating oil pumped by the first oil pump 200 first enters the first oil chamber 131, which can prevent this part of the lubricating oil from directly affecting the lubricating oil in the second oil chamber 132, and can make the lubricating oil in the second oil chamber 132 more stable, and can continuously and stably supply oil to the second oil pump 300.

[0056] Specifically, if Figure 6 As shown, the housing 110 includes a main body 111, a first housing cover 112, and a second housing cover 113. The lateral surface of the main body 111 is formed with a first oil chamber 131 and a second oil chamber 132. The first housing cover 112 is disposed on the open side of the first oil chamber 131, and the second housing cover 113 is disposed on the open side of the second oil chamber 132. In other words, the surface of the main body 111 is formed with two spaced-apart oil chambers 130. The two oil chambers 130 can be spaced apart vertically on the lateral surface of the main body 111, and both oil chambers 130 are open. This allows for sealing by the two spaced-apart housing covers. The two oil chambers 130 can occupy a portion of the outer space of the main body 111, making the housing 110 more compact and providing more functionality.

[0057] Among them, an annular sealing gasket can be provided between the main body 111 and the corresponding box cover. The provision of the annular sealing gasket can prevent the leakage of lubricating oil and ensure the sealing of the oil chamber 130. The annular sealing gasket can be a rubber gasket.

[0058] like Figure 6 As shown, the lateral surface of the main body 111 is provided with a first inclined surface 116 and a second inclined surface 117, extending from top to bottom. The first inclined surface 116 and the second inclined surface 117 are not coplanar. The first cover 112 is provided on the first inclined surface 116, and the second cover 113 is provided on the second inclined surface 117. In other words, the first oil chamber 131 is located above the second oil chamber 132. Specifically, the first oil chamber 131 is located obliquely above the second oil chamber 132. This arrangement of two oil chambers 130 facilitates the supply of oil from the first oil chamber 131 to the second oil chamber 132, ensuring that the second oil chamber 132 has sufficient lubricating oil, further ensuring that the second oil chamber 132 can continuously and stably supply oil to each kinematic pair, thereby preventing oil shortages. Furthermore, the arrangement of the two covers effectively utilizes the lateral space of the main body 111, resulting in a rational overall layout of the crankcase 100.

[0059] like Figure 6As shown, a plurality of first oil holes 133 are provided between the first oil chamber 131 and the second oil chamber 132 for connecting the first oil chamber 131 and the second oil chamber 132. The provision of the plurality of first oil holes 133 allows the lubricating oil in the first oil chamber 131 to flow smoothly into the second oil chamber 132, and reduces the flow rate of the lubricating oil in the first oil chamber 131, which helps maintain a stable oil level in the second oil chamber 132.

[0060] Specifically, if Figure 6 As shown, multiple first oil holes 133 are spaced apart along the length of the main body 111. The length of the main body 111 is the axial direction of the crankshaft. The provision of multiple first oil holes 133 can disperse the lubricating oil flowing from the first oil chamber 131 to the second oil chamber 132. Furthermore, the provision of multiple first oil holes 133 can effectively utilize the space at the lateral edge of the main body 111.

[0061] Among them, Figure 6 As shown, the shape of the first oil hole 133 has various forms. For example, the first oil hole 133 can be any one of circular, elongated and L-shaped. Specifically, there can be three first oil holes 133. The first oil hole 133 located on one side can be circular, for example, oblong. The first oil hole 133 can reasonably utilize the space at one side edge of the main body 111. The first oil hole 133 located in the middle can be elongated and extend along the length direction of the main body 111. In this way, the middle space of the lateral edge of the main body 111 can be utilized. The first oil hole 133 located on the other side can be L-shaped. The L-shaped first oil hole 133 can reasonably utilize the space at the other side edge of the main body 111.

[0062] According to a specific embodiment of the present invention, Figure 6 As shown, the main body 111 includes a first main body 114 and a second main body 115. The second main body 115 is installed between the first main body 114 and the oil pan 124. The first main body 114 is formed with a first oil chamber 131 on the lateral surface, and the second main body 115 is formed with a second oil chamber 132 on the lateral surface. In other words, the main body 111 adopts a structure of first and second main bodies 114 and 115 separated into upper and lower parts. This not only facilitates the installation and fixing of the crankshaft and balance shaft, but also facilitates the separate arrangement of the first and second oil chambers 131 and 132. This reduces the manufacturing difficulty of the main body 111, makes the structural layout of the main body 111 more rational, and improves the overall reliability.

[0063] Among them, Figure 6As shown, each first oil hole 133 can be divided into two parts. For example, part of the first oil hole 133 is provided at the bottom of the first body 114 and the top of the second body 115. In this way, the part located at the bottom of the first body 114 and the part located at the top of the second body 115 constitute an integral first oil hole 133. It should be noted that the shape of the part of the first body 114 and the part of the second body 115 can be the same, which can facilitate the opposite arrangement.

[0064] The arrangement of the oil outlet passage 140 will be described in detail below with reference to the accompanying drawings.

[0065] like Figure 1 and Figure 7 As shown, the oil outlet passage 140 includes a first oil outlet passage 141, a first oil outlet pipe 142, and a second oil outlet passage 143. The first oil outlet passage 141 connects the second oil pump 300 with one end of the first oil outlet pipe 142, while the other end of the first oil outlet pipe 142 is connected to the second oil outlet passage 143. Specifically, the first oil outlet pipe 142 connects between the first oil outlet passage 141 and the second oil outlet passage 143. The oil inlet 141a of the first oil outlet passage 141 is connected to the oil outlet of the second oil pump 300. This allows the second oil pump 300 to pump lubricating oil from the second oil chamber 132 into the first oil outlet passage 141, which then flows through the first oil outlet pipe 142 into the second oil outlet passage 143. The second oil outlet passage 143 can then supply oil to the corresponding multiple kinematic pairs. The provision of the first oil outlet pipe 142 effectively connects the first oil outlet passage 141 and the second oil outlet passage 143, reducing the overall design complexity of the oil outlet passage 140.

[0066] Among them, Figure 7 As shown, a pressure relief valve 144 is provided on the first oil outlet 141, and the pressure relief valve 144 is provided in the second oil chamber 132. It should be noted that when the oil pressure in the first oil outlet 141 is too high, the pressure relief valve 144 can perform pressure relief processing, which can ensure the oil supply stability of the oil outlet 140. In addition, by arranging the pressure relief valve 144 in the second oil chamber 132, the space in the second oil chamber 132 can be reasonably utilized, and part of the lubricating oil flowing out of the pressure relief valve 144 can flow directly into the second oil chamber 132. Figure 9 As shown, a pressure relief valve mounting hole 126 is provided on the inner wall of the second oil chamber 132 , and the pressure relief valve 144 is mounted at the pressure relief valve mounting hole 126 .

[0067] Further, combined with Figure 10 and Figure 11As shown, the crankcase 100 also includes: an oil filter 400, which is arranged on one side of the main body 111, and the oil outlet passage 140 includes a third oil outlet passage 145, which connects the first oil outlet pipe 142 and the oil filter 400, that is, the oil inlet 145a of the third oil outlet passage 145 is connected to the oil outlet of the first oil outlet pipe 142, and the oil outlet 145b of the third oil outlet passage 145 is connected to the oil inlet of the oil filter 400, and the oil filter 400 is also connected to the second oil outlet passage 143, that is, the oil filter 400 is connected to the oil inlet 143a of the second oil outlet passage 143. That is, the third oil outlet passage 145 and the oil filter 400 can be disposed between the first oil outlet pipe 142 and the second oil outlet passage 143. The third oil outlet passage 145 is used to supply oil to the oil filter 400, and the oil filter 400 can filter the lubricating oil. Thus, the oil filter 400 can provide pure lubricating oil to the second oil outlet passage 143, that is, to each kinematic pair, thereby ensuring lubrication of each kinematic pair. By locating the oil filter 400 on the side of the main body 111, the space in the crankcase 100 can be rationally utilized, and the oil filter 400 can also facilitate oil supply from the side of the second oil outlet passage 143 to the second oil outlet passage 143.

[0068] Specifically, if Figure 11 and Figure 14 As shown, the crankcase 100 further includes a third crankcase cover 118, which is disposed on one axial side of the main body 111. The oil filter 400 is disposed on the third crankcase cover 118. The third crankcase cover 118 is provided with a fourth oil outlet passage 146 and a fifth oil outlet passage 147. The fourth oil outlet passage 146 connects the third oil outlet passage 145 with the oil filter 400, and the fifth oil outlet passage 147 connects the oil filter 400 with the second oil outlet passage 143. It will be understood that since the oil filter 400 is disposed on the third crankcase cover 118, the third crankcase cover 118 needs to have corresponding oil passages, namely the fourth oil outlet passage 146 and the fifth oil outlet passage 147. The fourth oil outlet passage 146 is connected to the oil inlet of the oil filter 400, and the fifth oil outlet passage 147 is connected to the oil outlet of the oil filter 400. Therefore, the entire oil outlet passage 140 is reasonably arranged, and the lubricating oil in the second oil chamber 132 can be effectively supplied to each kinematic pair through the communication of multiple oil outlet passages 140 .

[0069] Also, such as Figure 11As shown, the third tank cover 118 is provided with a water pump shaft mounting hole 119, and a sixth oil outlet passage 148 is provided between the fourth oil outlet passage 146 and the water pump shaft mounting hole 119 to supply lubricating oil to the pump shaft. Water pump shaft mounting hole 119 is used to mount the pump shaft. Sliding friction is configured between the water pump shaft and the hole. The provision of the sixth oil outlet passage 148 allows a portion of the lubricating oil to be supplied to this sliding friction pair, thereby ensuring continuous lubrication of the pump shaft and the hole, thereby reducing wear on the pump shaft and the hole.

[0070] like Figure 7 、 Figure 9 and Figure 10 As shown, the first oil outlet passage 141 extends within the first and second main bodies 114 and 115, while the second oil outlet passage 143 and the first oil outlet pipe 142 are disposed within the first main body 114. In other words, the first oil outlet passage 141 essentially consists of two parts: a first part disposed on the first main body 114, and a second part disposed on the second main body 115. The oil outlet 141b of the first part is connected to the oil inlet of the first oil outlet pipe 142, while the oil inlet 141a of the second part is connected to the second oil pump 300. The second transfer port 141d of the first part and the first transfer port 141c of the second part are disposed opposite each other, and the first and second parts are then connected. This arrangement effectively connects the first and second parts, allowing the lubricating oil pumped by the second oil pump 300 to be smoothly pumped into the second oil outlet passage 143.

[0071] The second portion can be divided into three sections. The first section extends upward. The second section extends within the second body 115 toward the second oil chamber 132 and forms the pressure relief valve mounting hole 126, in which the pressure relief valve 144 is mounted. The third section continues to extend toward the first body 114 and forms the first transfer port 141c. The first section can be divided into two sections. The first section extends obliquely, with the lower end of the first section forming the second transfer port 141d. The first section extends toward the first oil chamber 131, and the second section changes its extension direction relative to the first section and forms the oil outlet 141b of the first oil outlet channel 141, thereby facilitating its connection to the oil inlet of the first oil outlet pipe 142.

[0072] like Figure 7As shown, a crankshaft mounting hole 120 and a balance shaft mounting hole 121 are formed in the main body 111, and a portion of the first oil outlet passage 141 is disposed between the crankshaft mounting hole 120 and the balance shaft mounting hole 121. The first section of the first portion and the third section of the second portion of the first oil outlet passage 141 are located between the crankshaft mounting hole 120 and the balance shaft mounting hole 121. This arrangement of the first oil outlet passage 141 allows for reasonable utilization of the internal space of the main body 111. In the width direction of the main body 111, the crankshaft mounting hole 120, the first oil outlet passage 141, the balance shaft mounting hole 121, and the first oil hole 133 are spaced apart. This arrangement of the main body 111 allows for higher space utilization and improved reliability while maintaining the overall structure.

[0073] like Figure 10 As shown, the second oil outlet channel 143 is disposed within the first main body 114, the first oil outlet pipe 142 is disposed within the first oil chamber 131, and the oil outlet port 141b of the first oil outlet channel 141 and the oil inlet port 145a of the third oil outlet channel 145 are disposed within the first oil chamber 131 and connected to the first oil outlet pipe 142. By arranging the first oil outlet pipe 142 within the first oil chamber 131, it is effectively protected while also allowing for the rational use of the space within the first oil chamber 131. Furthermore, this arrangement of the first oil outlet pipe 142 allows lubricating oil to be supplied from the center of the main body 111 to the axial edge of the main body 111, allowing the lubricating oil to enter the oil filter 400 for filtration. This arrangement of the first oil outlet pipe 142 effectively resolves the issue of lubricating oil supply direction and rationally utilizes the space within the first main body 114, resulting in a more rational overall layout.

[0074] Alternatively, as Figure 10 As shown, both ends of the first oil outlet pipe 142 are detachably mounted in the first oil chamber 131. The detachable manner can avoid affecting the internal space of the first body 114 and can make the overall layout of the crankcase 100 reasonable.

[0075] Among them, Figure 12 and Figure 13As shown, the oil outlet passage 140 further includes a seventh oil outlet passage 149 and an eighth oil outlet passage 150. The seventh oil outlet passage 149 connects the second oil outlet passage 143 with the crankshaft mounting hole 120, and the eighth oil outlet passage 150 connects the second oil outlet passage 143 with the balance shaft mounting hole 121. In other words, the seventh oil outlet passage 149 is used to supply oil to the crankshaft mounting hole 120, and the eighth oil outlet passage 150 is used to supply oil to the balance shaft mounting hole 121. A crankshaft and a bearing sleeve mounted on the crankshaft may be mounted in the crankshaft mounting hole 120, and lubricating oil may be used to lubricate the crankshaft and the corresponding bearing sleeve. A balance shaft and a bearing sleeve mounted on the balance shaft may be mounted in the balance shaft mounting hole 121, and lubricating oil may be used to lubricate the balance shaft and the corresponding bearing sleeve, thereby ensuring the lubrication effect of the crankshaft and the balance shaft, and ensuring the working reliability of the crankshaft and the balance shaft.

[0076] Specifically, if Figure 13 As shown, there are multiple crankshaft mounting holes 120 and multiple balance shaft mounting holes 121. The axis of the second oil outlet channel 143 is parallel to the crankshaft axis of the engine 1000. There are multiple seventh oil outlet channels 149 and multiple eighth oil outlet channels 150. The multiple seventh oil outlet channels 149 and multiple eighth oil outlet channels 150 are axially spaced apart. The multiple seventh oil outlet channels 149 correspond one-to-one with the multiple crankshaft mounting holes 120, and the multiple eighth oil outlet channels 150 correspond one-to-one with the multiple balance shaft mounting holes 121. For example, there are three crankshaft mounting holes 120 and three balance shaft mounting holes 121, and there are three seventh oil outlet channels 149 and three eighth oil outlet channels 150. The three seventh oil outlet channels 149 correspond one-to-one with the three crankshaft mounting holes 120, and the three eighth oil outlet channels 150 correspond one-to-one with the three balance shaft mounting holes 121. Thus, each mounting hole where a bearing is provided is provided with an oil outlet channel, thereby supplying lubricating oil and ensuring lubrication of the kinematic pair.

[0077] Alternatively, as Figure 3 As shown, a detachable oil quality monitoring tube 151 is provided on the first tank cover 112. The oil quality monitoring tube 151 is used to monitor the quality and level of the lubricating oil, which can facilitate the user to replenish and replace the lubricating oil in a timely manner, further ensure the lubrication effect of each moving pair, and extend the service life of the engine 1000.

[0078] like Figure 1 As shown, the oil inlet of the second oil pump 300 is provided with a first filter 310, which is disposed in the second oil chamber 132. The first filter 310 filters the lubricating oil, which can effectively protect the second oil pump 300 and prevent impurities from affecting the various moving parts.

[0079] Also, such as Figure 1As shown, the first filter screen 310 is cylindrical, and the axis of the first filter screen 310 is parallel to the crankshaft axis of the engine 1000. The first filter screen 310 thus configured can extend in the length direction of the second oil chamber 132, thereby facilitating the lubricating oil in the second oil chamber 132 to enter the first filter screen 310. Moreover, the first filter screen 310 thus configured can reasonably utilize the space in the second oil chamber 132. Figure 9 As shown, a first filter screen installation hole 125 is provided at the middle position of the bottom of the second oil chamber 132 , and one end of the first filter screen 310 is installed at the first filter screen installation hole 125 .

[0080] Among them, the second oil pump 300 is located below the second oil chamber 132, and the lubricating oil passing through the first filter 310 can enter the second oil pump 300. The second oil pump 300 configured in this way can conveniently pump the lubricating oil in the second oil chamber 132, and can also reasonably utilize the space in the second main body 115.

[0081] According to a specific embodiment of the present invention, Figure 3 As shown, an oil inlet passage 160 is provided between the first oil pump 200 and the first oil chamber 131. The oil inlet passage 160 is connected to an oil cooler 500, which is disposed between the oil inlet passage 160 and the first oil chamber 131. The oil cooler 500 cools the lubricating oil, thereby cooling the various kinematic joints, thereby improving the operating reliability of the various kinematic joints and, in turn, the operating reliability of the engine 1000. The oil cooler 500 may be a water-cooled oil cooler 500.

[0082] Among them, by setting the oil cooler 500 in the oil inlet channel 160, the oil pressure of the lubricating oil pumped by the first oil pump 200 can be used to ensure the flow of the lubricating oil in the oil inlet channel 160 and the oil cooler 500, without losing the oil pressure of the lubricating oil pumped by the second oil pump 300, which can facilitate the smooth flow of the lubricating oil to the surface of each moving pair, ensure the lubrication effect of each moving pair, and improve the working reliability of the engine 1000.

[0083] Alternatively, the oil cooler 500 may be disposed on the first crankcase cover 112 or the second crankcase cover 113. The oil cooler 500 may be primarily disposed within the oil inlet passage 160. By disposing the oil cooler 500 on the first crankcase cover 112 or the second crankcase cover 113, the integration of the crankcase cover can be increased, eliminating the need to find a suitable mounting location on the main body 111. Thus, the crankcase 100 structure is rationally designed.

[0084] like Figure 3As shown, the second body 115 is provided with a first oil inlet passage 161 and a fourth oil inlet passage 164, and the second tank cover 113 is provided with a second oil inlet passage 162 and a third oil inlet passage 163. The oil outlet of the first oil pump 200 and the oil inlet of the oil cooler 500 are connected via the first oil inlet passage 161 and the second oil inlet passage 162, while the oil outlet of the oil cooler 500 and the first oil chamber 131 are connected via the third oil inlet passage 163 and the fourth oil inlet passage 164. In other words, the first oil inlet passage 161 and the second oil inlet passage 162 connect the oil outlet of the first oil pump 200 and the oil inlet of the oil cooler 500, while the third oil inlet passage 163 and the fourth oil inlet passage 164 connect the oil outlet of the oil cooler 500 and the first oil chamber 131. This arrangement of the oil cooler 500 is rationally positioned, allowing lubricating oil to flow smoothly through the oil cooler 500 and providing a good cooling effect.

[0085] Combine Figure 4 and Figure 5 As shown, the oil inlet 161a of the first oil inlet channel 161 is located at the bottom of the second main body 115, which can facilitate the connection of the oil outlet of the first oil pump 200. The oil outlet 161b of the first oil inlet channel 161 is located below the oil inlet 164a of the fourth oil inlet channel 164, which can facilitate the setting of the first oil inlet channel 161 and the fourth oil inlet channel 164, and can further facilitate the setting of the oil inlet and oil outlet positions of the oil cooler 500.

[0086] Furthermore, if Figure 3 As shown, the first body 114 is provided with a first oil inlet pipe 165, and the first oil chamber 131 and the fourth oil inlet passage 164 are connected through the first oil inlet pipe 165. The first oil inlet pipe 165 is arranged vertically, and the upper end of the first oil inlet pipe 165 can be higher than the oil level in the first oil chamber 131. This can prevent the reverse flow of lubricating oil and can facilitate the flow of lubricating oil to the second oil chamber 132.

[0087] like Figure 2 and Figure 6 As shown, the second tank cover 113 includes a flat plate portion 122 and a raised portion 123. The raised portion 123 is disposed on one side of the flat plate portion 122 and is higher than the flat plate portion 122. The oil cooler 500 is disposed on the flat plate portion 122. The provision of the raised portion 123 can at least to some extent increase the volume of the second oil chamber 132, while the flat plate portion 122 can facilitate the installation and fixation of the oil cooler 500. This can also facilitate the docking of the oil inlet and outlet of the oil cooler 500 with the second tank cover 113, thereby further improving the structural reliability of the engine 1000.

[0088] like Figure 15As shown, the first oil pump 200 and the second oil pump 300 are coaxially arranged and share a common pump shaft. In other words, the first oil pump 200 and the second oil pump 300 share the same pump shaft, and their axial arrangement reduces the volume of the oil pump assembly and ensures that all moving parts of the engine 1000 receive continuous and stable lubrication. Furthermore, this arrangement of two oil pumps effectively separates the oil inlet passage 160 from the oil outlet passage 140, thereby optimizing the overall layout of the crankcase 100.

[0089] The flow process of lubricating oil in the engine 1000 will be described in detail below with reference to the accompanying drawings.

[0090] Taking the lubrication of the crankshaft as an example, the lubricating oil located in the oil pan 124 passes through: the second filter 210, the first oil pump 200, the first oil inlet channel 161, the second oil inlet channel 162, the oil cooler 500, the third oil inlet channel 163, the fourth oil inlet channel 164, the first oil inlet pipe 165, the first oil chamber 131, the first oil hole 133, the second oil chamber 132, the first filter 310, the second oil pump 300, the first oil outlet channel 141, the first oil outlet pipe 142, the third oil outlet channel 145, the fourth oil outlet channel 146, the oil filter 400, the fifth oil outlet channel 147, the second oil outlet channel 143 and the seventh oil outlet channel 149, and then flows to between the bearing and the crankshaft, so that the crankshaft can be lubricated.

[0091] Taking the lubrication of the balance shaft as an example, the lubricating oil located in the oil pan 124 passes through: the second filter 210, the first oil pump 200, the first oil inlet channel 161, the second oil inlet channel 162, the oil cooler 500, the third oil inlet channel 163, the fourth oil inlet channel 164, the first oil inlet pipe 165, the first oil chamber 131, the first oil hole 133, the second oil chamber 132, the first filter 310, the second oil pump 300, the first oil outlet channel 141, the first oil outlet pipe 142, the third oil outlet channel 145, the fourth oil outlet channel 146, the oil filter 400, the fifth oil outlet channel 147, the second oil outlet channel 143 and the eighth oil outlet channel 150, and then flows to between the bearing and the balance shaft, so that the balance shaft can be lubricated.

[0092] Taking the lubrication of the water pump shaft as an example, the lubricating oil located in the oil pan 124 passes through the following sequence: the second filter 210, the first oil pump 200, the first oil inlet channel 161, the second oil inlet channel 162, the oil cooler 500, the third oil inlet channel 163, the fourth oil inlet channel 164, the first oil inlet pipe 165, the first oil chamber 131, the first oil hole 133, the second oil chamber 132, the first filter 310, the second oil pump 300, the first oil outlet channel 141, the first oil outlet pipe 142, the third oil outlet channel 145, the fourth oil outlet channel 146 and the sixth oil outlet channel 148, and then flows between the hole and the water pump shaft, thereby lubricating the water pump shaft.

[0093] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0094] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An engine, characterized in that: include: A crankcase, the crankcase comprising: a case body and an oil pan, the oil pan being mounted on the bottom of the case body, the case body being formed with an oil inlet passage, an oil cavity, and an oil outlet passage, the oil cavity being disposed between the oil inlet passage and the oil outlet passage, the oil inlet passage communicating with the oil cavity and the oil pan, the oil cavity comprising a first oil chamber and a second oil chamber, the first oil chamber being disposed between the oil inlet passage and the second oil chamber, the second oil chamber being communicated with the oil outlet passage; an oil cooler, the oil cooler being arranged between the oil inlet passage and the first oil chamber; a first oil pump and a second oil pump, wherein the first oil pump is disposed between the oil pan and the oil inlet passage, and the second oil pump is disposed between the oil chamber and the oil outlet passage, and the oil chamber is located higher than the second oil pump; The oil outlet passage includes a first oil outlet passage, a first oil outlet pipe, and a second oil outlet passage, wherein the first oil outlet passage is connected to the second oil pump and one end of the first oil outlet pipe, and the other end of the first oil outlet pipe is connected to the second oil outlet passage; The housing includes a main body, the lateral surface of the main body is formed with the first oil chamber and the second oil chamber being open, and a plurality of first oil holes for connecting the first oil chamber and the second oil chamber are arranged between the first oil chamber and the second oil chamber; a crankshaft mounting hole and a balance shaft mounting hole are formed in the main body, and a part of the first oil outlet channel is arranged between the crankshaft mounting hole and the balance shaft mounting hole; in the width direction of the main body, the crankshaft mounting hole, the first oil outlet channel, the balance shaft mounting hole and the first oil hole are arranged at intervals.

2. The engine according to claim 1, characterized in that The box body includes a first box cover and a second box cover. The first box cover is arranged on the open side of the first oil chamber, the second box cover is arranged on the open side of the second oil chamber, and the oil cooler is arranged on the second box cover.

3. The engine according to claim 2, characterized in that The main body includes: a first main body and a second main body, the second main body is installed between the first main body and the oil pan, the first main body is formed with the first oil chamber on one side, the second main body is formed with the second oil chamber, and a plurality of first oil holes are correspondingly formed at the bottom of the first main body and the top of the second main body.

4. The engine according to claim 3, characterized in that The second tank cover includes a flat plate portion and a raised portion. The raised portion is provided on one side of the flat plate portion and is higher than the flat plate portion. The oil cooler is provided on the flat plate portion.

5. The engine according to claim 3, characterized in that The second main body is provided with a first oil inlet passage and a fourth oil inlet passage, the second tank cover is provided with a second oil inlet passage and a third oil inlet passage, the second oil inlet passage is provided between the first oil inlet passage and the oil inlet port of the oil cooler, and the third oil inlet passage is provided between the oil outlet of the oil cooler and the fourth oil inlet passage.

6. The engine according to claim 5, characterized in that The first main body is provided with a first oil inlet pipe communicating with the first oil chamber, and the first oil inlet pipe is communicated with the fourth oil inlet passage.

7. The engine according to claim 1, characterized in that Also includes: An oil filter is provided on one side of the casing, and the oil outlet passage further comprises a third oil outlet passage, the third oil outlet passage is connected between the first oil outlet pipe and the oil filter, and the oil filter is connected to the second oil outlet passage.

8. The engine according to claim 7, characterized in that The box body also includes: a third box cover, which is arranged on one axial side of the box body, and is provided with a fourth oil outlet passage and a fifth oil outlet passage. The fourth oil outlet passage is connected to the third oil outlet passage and the oil filter, and the fifth oil outlet passage is connected to the oil filter and the second oil outlet passage.

9. An all-terrain vehicle, characterized in that: include: The engine according to any one of claims 1 to 8.

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