Engine and crankcase

Abstract

The present invention discloses an engine and a crankcase thereof, wherein the crankcase comprises: a first case body; a second case body, the second case body is connected to the lower part of the first case body, the second case body and the first case body define a crankshaft cavity and a crankshaft hole, the crankshaft cavity is connected to the crankshaft hole, and the crankshaft hole is formed at one end of the first case body and the second case body; an oil pan, the oil pan is connected to the lower part of the second case body; and a side cover, the side cover is connected to the other end of the first case body and the second case body. Thus, by reasonably arranging the first case body and the second case body, it is convenient for the crankshaft to extend out of the crankcase and cooperate with the rotor, so that it can be applied to the extended-range powertrain, and the overall structure is reasonably arranged and has high structural reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, in particular to an engine and a crankcase thereof. Background Art

[0002] In the related technology, all-terrain vehicles generally adopt a single power source driving mode, which is usually a fuel engine. Among them, all-terrain vehicles generally have insufficient power under low engine speed conditions; at the same time, because the engine has to work under all conditions, the mixed gas is not fully burned during the low speed change process, the thermal efficiency is low, the fuel consumption is high, the harmful gas content in the exhaust is high, and the structure of the engine also restricts its application in all-terrain vehicles. 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 a crankcase that can be applied to an extended-range powertrain, can improve the engine, and can reduce the emission of harmful gases.

[0004] The present invention further provides an engine.

[0005] According to the crankcase of the present invention, it includes: a first case body; a second case body, the second case body is connected to the bottom of the first case body, the second case body and the first case body define a crankshaft cavity and a crankshaft hole, the crankshaft cavity is connected to the crankshaft hole, and the crankshaft hole is formed at one end of the first case body and the second case body; an oil pan, the oil pan is connected to the bottom of the second case body; and a side cover, the side cover is connected to the other end of the first case body and the second case body.

[0006] Therefore, according to the crankcase of the embodiment of the present invention, by reasonably arranging the first case body and the second case body, it is convenient for the crankshaft to extend out of the crankcase and cooperate with the rotor, so that it can be suitable for the extended-range powertrain, and the overall structure is reasonably arranged and the structural reliability is high.

[0007] In some examples of the present invention, a plurality of first shaft holes are formed on the lower side of the first housing, a plurality of second shaft holes are formed on the upper side of the second housing, and the plurality of first shaft holes correspond one-to-one to the plurality of second shaft holes to be suitable for installing a crankshaft.

[0008] In some examples of the present invention, a plurality of third axial holes are formed on the lower side of the first housing, a plurality of fourth axial holes are formed on the upper side of the second housing, and the plurality of third axial holes correspond one-to-one to the plurality of fourth axial holes to be suitable for installing a balancing shaft.

[0009] In some examples of the present invention, the first axial hole, the second axial hole, the third axial hole and the fourth axial hole are all semicircular holes.

[0010] In some examples of the present invention, oil grooves are disposed inside the first shaft hole, the second shaft hole, the third shaft hole, and the fourth shaft hole.

[0011] In some examples of the present invention, the crankcase further includes: a first case cover, the first case cover is connected to one side of the first case body, and the first case cover and the first case body form a first accommodating cavity.

[0012] In some examples of the present invention, relative to a joining plane of the first box body and the second box body, a mounting plane of the first box cover and the first box body is tilted.

[0013] In some examples of the present invention, the crankcase further includes: a second case cover, the second case cover is connected to one side of the second case body, the second case cover and the second case body form a second accommodating chamber, and the second accommodating chamber is connected to the first accommodating chamber.

[0014] In some examples of the present invention, relative to a joining plane of the first box body and the second box body, the second box cover is vertically arranged to a mounting plane of the second box body.

[0015] In some examples of the present invention, the first housing is provided with at least two through holes, and the two through holes are communicated with the crankshaft chamber.

[0016] In some examples of the present invention, at least one of the first housing and the second housing is provided with a limiting portion for limiting the position of the motor at one end of the crankshaft hole.

[0017] The engine according to the present invention comprises: the crankcase described above.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of an extended-range powertrain according to an embodiment of the present invention;

[0021] Figure 2 It is an exploded view of the engine;

[0022] Figure 3 is an exploded view of a range-extended powertrain at a generator according to an embodiment of the present invention;

[0023] Figure 4 This is an exploded view of the generator;

[0024] Figure 5 is a cross-sectional view of the motor mounting cover, motor housing and motor cover;

[0025] Figure 6 It is an exploded view of the crankcase;

[0026] Figure 7 It is an exploded view of the crankcase;

[0027] Figure 8 It is a schematic diagram of the oil pan and the drive shaft;

[0028] Fig. 9 is a schematic diagram of the oil pan;

[0029] Fig.10 is a schematic diagram of the oil pan;

[0030] Fig.11 This is an exploded view of the crankcase.

[0031] Reference numerals:

[0032] Extended-range powertrain 1000;

[0033] Engine 100; crankshaft 10; outer cone surface 11;

[0034] Crankcase 20; first case 21; first shaft hole 21a; third shaft hole 21b;

[0035] The second box body 22; the second shaft hole 22a; the fourth shaft hole 22b;

[0036] Oil pan 23; bottom wall 23a; side wall 23b; escape area 23c; oil guide portion 23d; oil guide rib 23e; plug cover 23f;

[0037] Side cover 24; first box cover 25; second box cover 26; sixth position limiting portion 27;

[0038] Cylinder body 30; piston connecting rod assembly 40;

[0039] Generator 200; motor mounting cover 210; accommodating groove 211; first limiting portion 212; fifth limiting portion 213;

[0040] Motor housing 220; accommodating hole 221; second limiting portion 222; third limiting portion 223; liquid inlet 224; liquid outlet 225;

[0041] Motor cover 230; fourth limiting portion 231; stator 240; rotor 250; box cover 260;

[0042] Transmission shaft 300. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0044] Reference below Figure 1-Figure 11 An extended-range powertrain 1000 according to an embodiment of the present invention is described, and the extended-range powertrain 1000 is applied to an all-terrain vehicle.

[0045] like Figure 1 As shown, the extended-range powertrain 1000 according to the embodiment of the present invention may include: an engine 100 and a generator 200, wherein the generator 200 is arranged on one axial side of the engine 100, for example, the generator 200 is arranged on the right side of the engine 100. The engine 100 and the generator 200 transmit power, the engine 100 drives the generator 200 to work, the generator 200 generates electric energy, the generator 200 is connected to the power battery and the motor of the all-terrain vehicle, and the power battery is connected to the motor, so that the electric energy of the generator 200 can be supplied to the motor, thereby driving the all-terrain vehicle to move.

[0046] Thus, the extended-range powertrain 1000 composed of the engine 100 and the generator 200 can convert the power generated by the engine 100 into electrical energy, and then supply the electric motor, thereby effectively increasing the cruising range of the all-terrain vehicle and solving the problem of insufficient power. Moreover, since the generator 200 is arranged on one side of the engine 100, the extended-range powertrain 1000 is small in size, occupies less space, and has better integrity. It should be noted that the engine 100 in the extended-range powertrain 1000 can ensure continuous normal working conditions, thereby improving energy efficiency, reducing energy waste, and reducing the emission of harmful gases.

[0047] like Figure 2 As shown, the engine 100 includes a crankshaft 10 and a crankcase 20. The crankshaft 10 is installed in the crankcase 20. The shaft end of the crankshaft 10 (i.e., the right shaft end) extends out of the crankcase 20. The shaft end of the crankshaft 10 can facilitate power transmission between the engine 100 and the generator 200.

[0048] like Figure 3 and Figure 4As shown, the generator 200 includes: a motor mounting cover 210, a motor housing 220, a motor cover 230, a stator 240 and a rotor 250. The motor mounting cover 210 is mounted on one side of the crankcase 20, the motor housing 220 is mounted between the motor mounting cover 210 and the motor cover 230, the stator 240 is fixed in the motor housing 220, the rotor 250 is arranged on the inner circumference of the stator 240, and the rotor 250 can rotate relative to the stator 240, and the rotor 250 is driven by the shaft end of the crankshaft 10. In other words, the shaft end of the crankshaft 10 substantially passes through the motor mounting cover 210 and then cooperates with the rotor 250, and then drives the rotor 250 to rotate to generate electricity. This method can make the engine 100 and the motor 200 highly integrated and highly efficient in transmission.

[0049] Therefore, by providing the motor mounting cover 210, the generator 200 can be securely installed on one side of the crankcase 20, which can further reduce the volume of the extended-range powertrain 1000. In addition, by providing the motor mounting cover 210, the motor housing 220 and the motor cover 230, the stator 240 and the rotor 250 can be reasonably installed, the installation reliability of the two can be guaranteed, and the transmission reliability of the shaft end of the crankshaft 10 and the rotor 250 can be guaranteed.

[0050] According to an optional embodiment of the present invention, the rotor 250 is formed with a rotor hole, the shaft end of the crankshaft 10 passes through the rotor hole, and the shaft end of the crankshaft 10 is in transmission with the rotor 250. That is, the rotor 250 is sleeved on the shaft end of the crankshaft 10, and then the two are sleeved and matched, so that synchronous rotation can be better ensured, power transmission between the engine 100 and the generator 200 can be achieved, and the stability of power transmission between the two can be ensured.

[0051] Optionally, the rotor 250 is formed with an internal spline at the rotor hole, and the shaft end of the crankshaft 10 is formed with an external spline, and the internal spline is spline-matched with the external spline. The matching of the internal spline and the external spline is simple, reliable, and easy to implement.

[0052] Alternatively, if Figure 3 and Figure 4 As shown, the rotor hole is formed with an inner conical surface, and the shaft end of the crankshaft 10 is formed with an outer conical surface 11, and the inner conical surface and the outer conical surface 11 cooperate with each other. The inner conical surface and the outer conical surface 11 can be fitted against each other, so that the rotor 250 can be securely mounted on the shaft end, and the reliability and transmission stability of both can be ensured.

[0053] Specifically, Figure 3 and Figure 4As shown, the motor housing 220 is formed with a receiving hole 221, the motor mounting cover 210 and the motor cover 230 are formed with receiving grooves 211 facing the motor housing 220, and the stator 240 is received in the receiving hole 221 and the two receiving grooves 211. That is, the middle of the stator 240 is received in the receiving hole 221, and the two sides of the stator 240 are respectively received in the corresponding receiving grooves 211, so that the stator 240 can be effectively received, the installation reliability of the stator 240 can be ensured, and the axial dimension of the motor housing 220 can be reduced.

[0054] Optionally, the accommodating hole 221 is interference-fitted with the stator 240. The interference-fit method is simple and reliable, which can ensure the installation reliability of the stator 240 in the motor housing 220.

[0055] According to a specific embodiment of the present invention, Figure 5 As shown, the motor mounting cover 210 is provided with a first limiting portion 212, the second limiting portion 222 and the third limiting portion 223 are provided on both sides of the motor housing 220, and the motor cover 230 is provided with a fourth limiting portion 231. The first limiting portion 212 is limited and matched with the second limiting portion 222, and the third limiting portion 223 is limited and matched with the fourth limiting portion 231. The first limiting portion 212 and the second limiting portion 222 can play a role in pre-limiting the motor mounting cover 210 and the motor housing 220, which can reduce the installation difficulty of the generator 200 and improve the installation reliability between the motor mounting cover 210 and the motor housing 220. The third limiting portion 223 and the fourth limiting portion 231 can play a role in pre-limiting the motor housing 220 and the motor cover 230, which can reduce the installation difficulty of the generator 200 and improve the installation reliability between the motor housing 220 and the motor cover 230.

[0056] Among them, Figure 5 As shown, one of the first limiting portion 212 and the second limiting portion 222 is a convex limiting ring and the other is a concave limiting groove, and one of the third limiting portion 223 and the fourth limiting portion 231 is a convex limiting ring and the other is a concave limiting groove. For example, the first limiting portion 212 and the fourth limiting portion 231 are both limiting rings, and the second limiting portion 222 and the third limiting portion 223 are both limiting grooves, which can reduce the manufacturing difficulty of the motor housing 220 to at least a certain extent. Through the cooperation of the limiting groove and the limiting ring, the structural reliability of the generator 200 can be improved, and the installation difficulty of the generator 200 can be reduced.

[0057] Also, combined Figure 5 and Fig.11As shown, the motor mounting cover 210 is provided with a fifth limiting portion 213, and the crankcase 20 is provided with a sixth limiting portion 27, and the fifth limiting portion 213 is limitedly matched with the sixth limiting portion 27. The fifth limiting portion 213 and the sixth limiting portion 27 can play a role in pre-limiting the motor mounting cover 210 and the crankcase 20, which can reduce the difficulty of installing the generator 200, and can improve the installation reliability of the motor mounting cover 210 and the crankcase 20.

[0058] Among them, Figure 5 and Fig.11 As shown, one of the fifth limiting portion 213 and the sixth limiting portion 27 is a convex limiting ring and the other is a concave limiting groove. For example, the fifth limiting portion 213 can be a limiting groove, and the sixth limiting portion 27 can be a limiting ring. The motor mounting cover 210 can be provided with a through hole for the shaft end of the crankshaft 10 to pass through, and the through hole can be provided with a bearing, and the limiting ring is arranged around the bearing.

[0059] Alternatively, if Figure 3 and Figure 4 As shown, the stator 240 is connected to the outlet terminal, a part of the motor cover 230 protrudes in a direction away from the motor housing 220 to form a receiving space for receiving the outlet terminal, and the generator 200 further includes: a box cover 260, which is arranged at the receiving space. Thus, the generator 200 can effectively solve the problem of arranging the outlet terminal, and only the box cover 260 needs to be added, thereby simplifying the manufacturing difficulty of the generator 200. A sealing gasket can be arranged between the box cover 260 and the motor cover 230.

[0060] Specifically, Figure 4 As shown, a liquid cooling channel is formed in the motor housing 220, and the motor housing 220 is also provided with a liquid inlet 224 and a liquid outlet 225 connected to the liquid cooling channel. In other words, a coolant can flow in the motor housing 220, and the coolant arranged in the cooling channel can take away the heat generated when the generator 200 is working, thereby effectively reducing the temperature of the generator 200, and the temperature of the generator 200 can be kept in a reasonable working temperature range.

[0061] Optionally, the motor mounting cover 210 can be detachably mounted on one side of the crankcase 20, the motor housing 220 can be detachably mounted on one side of the motor mounting cover 210, and the motor cover 230 can be detachably mounted on one side of the motor housing 220. The detachable manner can be fixedly connected by fasteners. The generator 200 thus configured has a simple structure and is easy to install, thereby reducing the difficulty of installing the generator 200 and facilitating subsequent maintenance.

[0062] Among them, Figure 4As shown, the engine 100 may further include: a cylinder block 30 and two piston-connecting rod assemblies 40 . The cylinder block 30 is disposed at the upper portion of the crankcase 20 . The cylinder block 30 has two cylinders. The pistons of the two piston-connecting rod assemblies 40 are respectively disposed in the two cylinders and the connecting rods are respectively connected to the crankshaft 10 .

[0063] The crankcase 20 of the engine 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0064] like Figure 6 , Figure 7 and Fig.11 As shown, the crankcase 20 according to the embodiment of the present invention may include: a first case 21, a second case 22, an oil pan 23 and a side cover 24. The second case 22 is connected to the bottom of the first case 21. The second case 22 and the first case 21 define a crankshaft cavity and a crankshaft hole. The crankshaft cavity is connected to the crankshaft hole. The crankshaft hole is formed at one end of the first case 21 and the second case 22. The oil pan 23 is connected to the bottom of the second case 22. The side cover 24 is connected to the other end of the first case 21 and the second case 22. The first case 21 and the second case 22 cooperate with each other up and down, so that the first case 21 and the second case 22 can define a crankshaft cavity, the crankshaft 10 can be accommodated in the crankshaft cavity, and the shaft end of the crankshaft 10 can extend out of the crankshaft cavity through the crankshaft hole, and then extend into the generator 200 to cooperate with the rotor 250. A bearing or a bushing can be provided at the crankshaft hole, so that the rotation stability of the crankshaft 10 can be ensured. The side cover 24 can play a covering role, thereby further improving the structural reliability of the crankcase 20.

[0065] Therefore, according to the crankcase 20 of the embodiment of the present invention, by reasonably arranging the first case body 21 and the second case body 22, it is convenient for the crankshaft 10 to extend out of the crankcase 20 and cooperate with the rotor 250, so that it can be suitable for the extended-range powertrain 1000, and the overall structural layout is reasonable and the structural reliability is high.

[0066] like Figure 6 and Figure 7 As shown, a plurality of first shaft holes 21a are formed on the lower side of the first housing 21, and a plurality of second shaft holes 22a are formed on the upper side of the second housing 22, and the plurality of first shaft holes 21a correspond to the plurality of second shaft holes 22a one by one, so as to be suitable for installing the crankshaft 10. In other words, the first shaft holes 21a of the first housing 21 and the second shaft holes 22a of the second housing 22 cooperate with the crankshaft 10, which can facilitate the installation and arrangement of the crankshaft 10, and can reduce the difficulty of arranging the first housing 21 and the second housing 22.

[0067] Furthermore, if Figure 6 and Figure 7As shown, a plurality of third shaft holes 21b are formed on the lower side of the first housing 21, and a plurality of fourth shaft holes 22b are formed on the upper side of the second housing 22. The plurality of third shaft holes 21b correspond to the plurality of fourth shaft holes 22b one by one, so as to be suitable for installing a balancing shaft. The plurality of third shaft holes 21b and the plurality of first shaft holes 21a are arranged at intervals on the lower side of the first housing 21, and the plurality of second shaft holes 22a and the plurality of fourth shaft holes 22b are arranged at intervals on the upper side of the second housing 22. The first housing 21 and the second housing 22 arranged in this way can also accommodate a balancing shaft, which is driven by the crankshaft 10. The balancing shaft can be used to balance the reciprocating inertia force generated when the piston connecting rod assembly 40 moves, thereby improving the running smoothness of the engine 100.

[0068] Specifically, Figure 6 and Figure 7 As shown, the first shaft hole 21a, the second shaft hole 22a, the third shaft hole 21b and the fourth shaft hole 22b can all be semicircular holes. Semicircular holes are easy to design and manufacture, and shaft holes of such shapes are easy to support the crankshaft 10 and the balance shaft, and can also facilitate the installation and arrangement of bearings and bearing bushes.

[0069] Optionally, the first shaft hole 21a, the second shaft hole 22a, the third shaft hole 21b and the fourth shaft hole 22b are all provided with oil grooves. Lubricating oil flows in the oil grooves, and the bearings or bushes can be connected to the oil grooves, so that the lubricating oil can effectively lubricate the contact surface of the crankshaft 10 and the balance shaft, reduce the wear of the crankshaft 10 and the balance shaft, extend the service life of the crankshaft 10 and the balance shaft, and improve the reliability of the crankshaft 10 and the balance shaft.

[0070] According to an optional embodiment of the present invention, Figure 6 As shown, the crankcase 20 further includes: a first case cover 25, the first case cover 25 is connected to one side of the first case body 21, and the first case cover 25 and the first case body 21 form a first accommodating cavity. The first accommodating cavity can play a role of accommodating, can change the structure of the crankcase 20, and can make the overall layout of the crankcase 20 more reasonable.

[0071] Among them, Figure 6 As shown, the first box cover 25 and the installation plane of the first box body 21 are inclined relative to the joining plane of the first box body 21 and the second box body 22. The first box cover 25 thus arranged can effectively adapt to the surface of the first box body 21, and can ensure its installation reliability on the surface of the first box body 21. The first box cover 25 and the first box body 21 can be fixedly connected by fasteners.

[0072] Furthermore, if Figure 6As shown, the crankcase 20 may further include: a second case cover 26, the second case cover 26 is connected to one side of the second case body 22, the second case cover 26 and the second case body 22 form a second accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity. The second accommodating cavity can play a role of accommodating, can change the structure of the crankcase 20, and can make the overall layout of the crankcase 20 more reasonable.

[0073] Among them, Figure 6 and Fig.11 As shown, relative to the joining plane of the first box body 21 and the second box body 22, the second box cover 26 is arranged perpendicular to the installation plane of the second box body 22. The second box cover 26 arranged in this way can effectively adapt to the surface of the second box body 22, and can ensure its installation reliability on the surface of the second box body 22. The second box cover 26 and the second box body 22 can be fixedly connected by fasteners.

[0074] Optionally, the first housing 21 is provided with at least two through holes, and the two through holes are connected to the crankshaft chamber. The two through holes may correspond to the two cylinders of the cylinder body 30, or may correspond to the two piston connecting rod groups 40, that is, the crankcase 20 thus provided may be suitable for the twin-cylinder engine 100, thereby improving the power performance of the engine 100 and making the power generation efficiency of the generator 200 high.

[0075] Specifically, at least one of the first housing 21 and the second housing 22 is provided with a limiting portion on one side of the crankshaft hole for limiting the position of the generator 200. The limiting portion is the sixth limiting portion 27 mentioned above, and the first housing 21 and the second housing 22 provided in this way can ensure the installation reliability of the generator 200.

[0076] The oil pan 23 of the crankcase 20 according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0077] like Figure 8-Figure 10 As shown, the oil pan 23 according to the embodiment of the present invention may include: a bottom wall 23a and a plurality of side walls 23b, wherein the plurality of side walls 23b are connected to different sides of the bottom wall 23a, and the plurality of side walls 23b define an open oil groove above the bottom wall 23a. It can be understood that the oil groove is used to contain lubricating oil, and the lubricating oil that lubricates the moving parts of the engine 100 flows downward under the action of gravity and finally converges into the oil groove, and the lubricating oil in the oil groove can also be supplied upward in a certain manner, for example, the oil supply method can be a sputtering method or a suction method. Among them, an arc transition is adopted between adjacent side walls 23b. The arc transition can make the oil pan 23 transition naturally, with high structural reliability and good integrity.

[0078] like Figure 8As shown, at least one side wall 23b is provided with an escape area 23c for escaping the transmission shaft 300. That is, the transmission shaft 300 is arranged around the bottom wall 23a of the oil pan 23, and the escape area 23c can effectively escaping the transmission shaft 300, and can provide a certain accommodation space for the transmission shaft 300, so that the overall structure layout of the all-terrain vehicle can be reasonable, and the minimum ground clearance of the all-terrain vehicle can be increased to at least a certain extent, and the passability of the all-terrain vehicle can be improved.

[0079] Alternatively, if Figure 8 and Fig. 9 As shown, the surface of the avoidance area 23c can be an arcuate surface that is concave toward the inside of the oil tank. The arcuate surface can effectively avoid the transmission shaft 300, and can reduce the manufacturing difficulty of the oil pan 23, and can improve the structural reliability of the oil pan 23.

[0080] Among them, Figure 8 As shown, the two opposite side walls 23b are both provided with avoidance areas 23c. That is to say, the left and right side walls 23b of the oil pan 23 are both provided with avoidance areas 23c, and the two transmission shafts 300 are respectively provided on both sides of the oil pan 23. The overall layout of the oil pan 23 arranged in this way is reasonable, and the two transmission shafts 300 can be effectively avoided, and the overall layout of the all-terrain vehicle can be reasonable.

[0081] Alternatively, if Fig. 9 As shown, each side wall 23b is provided with an oil guide portion 23d extending obliquely from the upper end toward the bottom wall 23a. The oil guide portion 23d may be an oil guide slope, which can facilitate the lubricating oil to flow downward to the bottom of the oil pan 23, and can improve the ability of the oil pan 23 to gather lubricating oil.

[0082] Among them, Fig. 9 As shown, an oil guide rib 23e is formed on the inner surface of each side wall 23b. The oil guide rib 23e can be a protruding rib. The setting of the oil guide rib 23e can play the role of oil guide on the one hand, and can improve the structural reliability of the oil pan 23 on the other hand.

[0083] Specifically, Figure 8 and Fig. 9 As shown, the bottom wall 23a is formed with an oil drain hole, and a plugging cover 23f is provided at the oil drain hole. When the lubricating oil has not been replaced for a long time, the user or maintenance personnel can open the plugging cover 23f, release the lubricating oil, and then replace the lubricating oil, thereby facilitating the replacement of the lubricating oil and being beneficial to improving the performance of the engine 100.

[0084] Alternatively, if Figure 8 and Fig.10As shown, the cross-sectional area of ​​the oil pan 23 decreases from the opening to the bottom. In other words, the oil pan 23 is configured as a structure that tapers from top to bottom. The oil pan 23 configured in this way is convenient for gathering lubricating oil, and can facilitate the lubricating oil to lubricate the kinematic pair again.

[0085] The oil pan 23 is an aluminum alloy shell, which has high structural strength and light weight. The oil pan 23 configured in this way meets the lightweight design goal of the all-terrain vehicle.

[0086] The all-terrain vehicle according to an embodiment of the present invention comprises the extended-range powertrain 1000, a power battery, an electric motor and a transmission system of the above-mentioned embodiment, wherein the power battery is connected to the generator 200, the electric motor is connected to the power battery, and the input end of the transmission system is connected to the electric motor.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0088] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A crankcase, characterized in that: include: The first box; A second case body, the second case body is connected to the lower side of the first case body, the second case body and the first case body define a crankshaft cavity and a crankshaft hole, the crankshaft cavity is communicated with the crankshaft hole, and the crankshaft hole is formed at one end of the first case body and the second case body; An oil pan, the oil pan is connected to the lower part of the second housing, the oil pan comprises a bottom wall and a plurality of side walls, the plurality of side walls are connected to different sides of the bottom wall, and at least one of the side walls is provided with an escape area for escaping a transmission shaft; A side cover connected to the other end of the first box body and the second box body; A first box cover, the first box cover is connected to one side of the first box body, and the first box cover and the first box body form a first accommodating cavity; The second box cover is connected to one side of the second box body. The second box cover and the second box body form a second accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity.

2. The crankcase according to claim 1, characterized in that A plurality of first shaft holes are formed on the lower side of the first housing, and a plurality of second shaft holes are formed on the upper side of the second housing. The plurality of first shaft holes correspond to the plurality of second shaft holes one by one to be suitable for installing a crankshaft.

3. The crankcase according to claim 2, characterized in that: A plurality of third shaft holes are formed on the lower side of the first housing, and a plurality of fourth shaft holes are formed on the upper side of the second housing. The plurality of third shaft holes correspond to the plurality of fourth shaft holes one by one to be suitable for installing a balancing shaft.

4. The crankcase according to claim 3, characterized in that: The first axial hole, the second axial hole, the third axial hole and the fourth axial hole are all semicircular holes.

5. The crankcase according to claim 3, characterized in that: The first shaft hole, the second shaft hole, the third shaft hole and the fourth shaft hole are all provided with oil grooves therein.

6. The crankcase according to claim 1, characterized in that Relative to a joining plane between the first box body and the second box body, a mounting plane between the first box cover and the first box body is inclined.

7. The crankcase according to claim 1, characterized in that Relative to a joining plane between the first box body and the second box body, the second box cover is vertically arranged to a mounting plane of the second box body.

8. The crankcase according to claim 1, characterized in that The first housing is provided with at least two through holes, and the two through holes are communicated with the crankshaft chamber.

9. The crankcase according to claim 1, characterized in that At least one of the first housing and the second housing is provided with a limiting portion for limiting the position of the motor at one end of the crankshaft hole.

10. An engine, characterized in that: include: The crankcase according to any one of claims 1 to 9.

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