Engine and motorcycle

Abstract

An embodiment of the present invention provides an engine and a motorcycle, wherein the engine includes: an output shaft; a crankshaft, the crankshaft being located in front of the output shaft; a countershaft, the countershaft being located above a line connecting the center of the crankshaft and the center of the output shaft; a shift shaft, the shift shaft being located below a line connecting the center of the crankshaft and the center of the output shaft; a shift trend sensor, the shift trend sensor being located behind the shift shaft; a shift fork shaft, the shift fork shaft being located below the output shaft and the countershaft; a shift cam bearing, the shift cam bearing being located below the output shaft and the countershaft; a baffle, the baffle being provided on the outside of the shift fork shaft and the shift cam bearing; wherein the lines connecting the center of the crankshaft, the center of the countershaft, and the center of the output shaft form a triangle. The present application limits the movement of the shift fork shaft and the shift cam bearing by providing a baffle, thereby improving the compactness of the structure.

Description

Technical Field

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

[0002] Motorcycles are two- or three-wheeled vehicles powered by electricity, gasoline, or hybrid power. They are lightweight, flexible, and fast, and are widely used for patrol, passenger and freight transportation, and as sports equipment. Generally speaking, motorcycles are categorized as street bikes, road racing bikes, off-road bikes, cruisers, and touring bikes.

[0003] In the prior art, the shift fork shaft hole and the shift cam bearing hole of the motorcycle engine case are through holes. When the vehicle is running, the shift fork shaft and the shift cam bearing are easy to move and separate from the engine, causing damage to the shift function. In severe cases, it may even cause the internal components of the engine to get stuck, causing damage to the engine. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an engine for solving the technical problem in the prior art that the shift fork shaft and the shift cam bearing are prone to movement.

[0005] To solve the above technical problems, the embodiments of the present invention adopt the following technical solutions:

[0006] output shaft;

[0007] a crankshaft, the crankshaft being located in front of the output shaft;

[0008] a countershaft, the countershaft being located above a line connecting a center of the crankshaft and a center of the output shaft;

[0009] a shift shaft, the shift shaft being located below a line connecting the center of the crankshaft and the center of the output shaft;

[0010] a shift trend sensor, the shift trend sensor being located behind the shift shaft;

[0011] a shift fork shaft, the shift fork shaft being located below the output shaft and the countershaft;

[0012] a shift cam bearing, the shift cam bearing being located below the output shaft and the countershaft;

[0013] a baffle, the baffle being arranged on the outer sides of the shift fork shaft and the shift cam bearing;

[0014] The center of the crankshaft, the center of the secondary shaft, and the center of the output shaft are connected to form a triangle.

[0015] In some embodiments of the present application, the baffle is fixedly connected to the engine via locking bolts, and the centers of the three locking bolts are connected to each other to form a triangle.

[0016] In some embodiments of the present application, a line connecting the center of the crankshaft and the center of the output shaft is arranged at a preset angle to a horizontal plane.

[0017] In some embodiments of the present application, the engine further comprises:

[0018] A balance shaft is arranged in front of the crankshaft.

[0019] In some embodiments of the present application, the engine further comprises:

[0020] A water pump is provided in front of the balance shaft, and a line connecting a center of the water pump and a center of the countershaft is located above the crankshaft.

[0021] In some embodiments of the present application, the engine further comprises:

[0022] An oil pump is located at the rear and lower part of the crankshaft.

[0023] In some embodiments of the present application, the engine includes:

[0024] a first gear, the first gear being mounted on the crankshaft;

[0025] a second gear, the second gear meshing with the first gear and mounted on the balance shaft;

[0026] a third gear, the third gear meshing with the first gear and mounted on the countershaft;

[0027] The crankshaft drives the balance shaft through the first gear and the second gear, and the crankshaft drives the countershaft through the first gear and the third gear.

[0028] In some embodiments of the present application, the engine includes:

[0029] a first sprocket mounted on the crankshaft;

[0030] a second sprocket connected to the first sprocket via a chain and configured to be mounted on the camshaft;

[0031] a fourth gear, mounted on the balance shaft and located to the right of the second gear;

[0032] a fifth gear, meshing with the fourth gear, mounted on the water pump, and configured for the balance shaft to drive the water pump via the fourth gear;

[0033] Among them, the balance shaft is placed at the front of the engine.

[0034] In some embodiments of the present application, the engine includes:

[0035] a sixth gear, mounted on the crankshaft;

[0036] a seventh gear, meshing with the sixth gear and mounted on the oil pump;

[0037] Wherein, the crankshaft drives the oil pump through the sixth gear and the seventh gear.

[0038] The present invention further provides a motorcycle, which includes the engine as described above.

[0039] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0040] An embodiment of the present invention provides an engine, which includes: an output shaft; a crankshaft, wherein the crankshaft and the output shaft are arranged in front and behind; a countershaft, wherein the countershaft is located above the line connecting the center of the crankshaft and the center of the output shaft; a shift shaft, wherein the shift shaft is located below the line connecting the center of the crankshaft and the center of the output shaft; and a shift trend sensor, wherein the shift trend sensor is located behind the shift shaft, wherein the center of the crankshaft, the center of the countershaft and the center of the output shaft are connected to form a triangle. Compared with the prior art, since the center of the secondary shaft and the center of the output shaft are connected to form a triangle, that is, the center of the crankshaft, the center of the secondary shaft and the center of the output shaft are the three vertices of the triangle, the secondary shaft is not on the same straight line as the crankshaft and the output shaft, which effectively shortens the distance between the crankshaft and the output shaft, so that the engine can reduce the width space used on the same straight line, making the engine more compact and lighter, thereby promoting the lightweight and compactness of the motorcycle; further, the present application limits the movement of the shift fork shaft and the shift cam bearing by setting a baffle, thereby avoiding the shift fork shaft and the shift cam bearing from being separated from the engine due to movement, causing damage to the shifting function. The setting of the baffle reduces the number of engine parts and improves the compactness of the structure.

[0041] An embodiment of the present invention further provides a motorcycle, which, by adopting the engine described above, can effectively solve the technical problem in the prior art that the gear shift trend sensor is easily affected by external factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0043] Figure 1 This is a first structural schematic diagram of an engine provided by an embodiment of the present invention;

[0044] Figure 2 is a second structural schematic diagram of an engine provided by an embodiment of the present invention;

[0045] Figure 3 is a third structural schematic diagram of an engine provided by an embodiment of the present invention;

[0046] Figure 4 is a fourth structural schematic diagram of an engine provided by an embodiment of the present invention;

[0047] Figure 5 is a fifth structural schematic diagram of an engine provided by an embodiment of the present invention;

[0048] Figure 6 is a sixth structural schematic diagram of an engine provided by an embodiment of the present invention;

[0049] Figure 7 is a seventh structural schematic diagram of an engine provided by an embodiment of the present invention;

[0050] Figure 8 is an eighth structural schematic diagram of an engine provided by an embodiment of the present invention;

[0051] Figure 9 is a ninth structural schematic diagram of an engine provided by an embodiment of the present invention;

[0052] Figure 10 This is the tenth structural schematic diagram of an engine provided by an embodiment of the present invention.

[0053] in:

[0054] 100, output shaft; 200, crankshaft; 300, countershaft; 400, shift shaft; 402, shift trend sensor; 403, shift connecting rod; 500, balance shaft; 600, water pump; 700, oil pump; 800, shift fork shaft; 801, shift cam bearing; 802, baffle; 803, locking bolt; 8031, first bolt; 8032, second bolt; 8033, third bolt; 101, first gear; 102, first sprocket; 103, sixth gear; 201, second gear; 202, fourth gear; 301, third gear; 401, fifth gear; 501, seventh gear. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0057] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0058] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0059] like Figure 1-9 As shown, Figure 1 A schematic structural diagram of an engine provided by an embodiment of the present invention;

[0060] This embodiment provides an engine, which includes:

[0061] Output shaft 100;

[0062] A crankshaft 200 , wherein the crankshaft 200 and the output shaft 100 are arranged in front and behind each other; and

[0063] A countershaft 300 , the countershaft 300 being located above a line connecting the center of the crankshaft 200 and the center of the output shaft 100 ;

[0064] A shift shaft 400 , the shift shaft 400 being located below a line connecting the center of the crankshaft 200 and the center of the output shaft 100 ;

[0065] a shift trend sensor 402 , the shift trend sensor 402 being located behind the shift shaft 400 ;

[0066] a shift fork shaft 800 , the shift fork shaft 800 being located below the output shaft 100 and the countershaft 300 ;

[0067] a shift cam bearing 801 , the shift cam bearing 801 being located below the output shaft 100 and the countershaft 300 ;

[0068] a blocking piece 802 , the blocking piece 802 being provided on the outer sides of the shift fork shaft 800 and the shift cam bearing 801 ;

[0069] The center of the crankshaft 200 , the center of the countershaft 300 , and the center of the output shaft 100 are connected to form a triangle.

[0070] Since the secondary shaft 300 is located above the line connecting the center of the crankshaft 200 and the center of the output shaft 100, more space can be reserved for the shift assembly, so that the shift shaft 400 can be located below the line connecting the center of the crankshaft 200 and the center of the output shaft 100, and the shift trend sensor 402 is located behind the shift shaft 400.

[0071] In the engine of this embodiment, since the center of the countershaft 300 and the center of the output shaft 100 are connected to form a triangle, that is, the center of the crankshaft 200, the center of the countershaft 300 and the center of the output shaft 100 are the three vertices of the triangle, the countershaft 300 is not on the same straight line as the crankshaft 200 and the output shaft 100, which effectively shortens the distance between the crankshaft 200 and the output shaft 100, so that the width space used for the same straight line of the engine can be reduced, making the engine more compact and lighter. Furthermore, the shifting tendency The shift trend sensor 402 is located below the engine and arranged behind the shift shaft 400. The shift shaft 400 can effectively block foreign objects and mud and water flying from the front of the vehicle, thereby ensuring the sensing performance of the shift trend sensor and preventing flying stones or other objects from damaging the shift trend sensor 402. Furthermore, the present application limits the movement of the shift fork shaft 800 and the shift cam bearing 801 by setting a baffle 802, thereby avoiding the shift fork shaft 800 and the shift cam bearing 801 from detaching from the engine due to movement, and the setting of the baffle 802 reduces the number of engine components and improves the compactness of the structure.

[0072] In some embodiments of the present application, the baffle 802 is fixedly connected to the engine via locking bolts 803 , and the centers of three locking bolts 803 are connected to each other to form a triangle.

[0073] Furthermore, the locking bolt 803 includes a first bolt 8031, a second bolt 8032 and a third bolt 8033, wherein the mounting hole of the third bolt 8033 is protruded around a circular arc portion to form an anti-misinstallation structure. When the baffle is reversely installed, the protruding portion can interfere with the box body to prevent misinstallation.

[0074] In some embodiments of the present application, the engine further comprises:

[0075] The shift connecting rod 403 is arranged on the outer side of the shift trend sensor 402 .

[0076] The shift shaft 400 can block foreign objects and muddy water flying from the front of the vehicle, while the shift connecting rod 403 can block foreign objects and muddy water flying from the side of the vehicle, thereby protecting the shift trend sensor 402 from external influences.

[0077] In some embodiments of the present application, the shift trend sensor 402 needs to be connected to various structures through cables. In order to prevent the cables from being greatly affected by external factors, the cables are arranged upward along the gap between the magneto cover and the sprocket cover of the engine case and close to the case.

[0078] In the field of existing motorcycles, functional improvements have reached a certain bottleneck. The motorcycle is light and flexible, and there are certain requirements for its weight and volume space, which has led to the need for lightweight and compact motorcycles. The engine provided in this embodiment is based on this demand. The center of the crankshaft 200, the center of the countershaft 300 and the center of the output shaft 100 are connected to form a triangle, so that the engine is more compact and lighter, thereby promoting the lightweight and compactness of the motorcycle.

[0079] The crankshaft 200 is connected to the connecting rod, and the crankshaft 200 is connected to the countershaft 300 through a gear, so as to transmit power to the countershaft 300 , and the countershaft 300 is used for transmission and speed change.

[0080] The countershaft 300 is connected to the output shaft 100 via gears. The countershaft 300 is used to drive the output shaft 100 to rotate, and the output shaft 100 drives the rear wheels to rotate so that the vehicle can move.

[0081] In some embodiments of the present application, a line connecting the center of the crankshaft 200 and the center of the output shaft 100 is arranged at a preset angle to a horizontal plane.

[0082] The preset angle can be 2-60 degrees. By setting the preset angle, the crankshaft 200 and the output shaft 100 can be more compact, thereby reducing the height of the engine. Combined with the fact that the countershaft 300 is located above the line connecting the center of the crankshaft 200 and the center of the output shaft 100, the length and height of the engine are effectively reduced.

[0083] In some embodiments of the present application, the engine further comprises:

[0084] The balance shaft 500 is disposed in front of the crankshaft 200 .

[0085] Since other mechanisms cannot be arranged in front of the crankshaft 200, arranging the balance shaft 500 in front of the crankshaft 200 has no effect on the overall size of the engine and can further improve the compactness of the engine.

[0086] The crankshaft 200 is connected to the balance shaft 500 through a gear and drives the balance shaft 500 . The balance shaft 500 is used to reduce vibration of the power machine.

[0087] In some embodiments of the present application, the engine further comprises:

[0088] The water pump 600 is disposed in front of the balance shaft 500 , and a line connecting the center of the water pump 600 and the center of the countershaft 300 is located above the crankshaft 200 .

[0089] The water pump 600 is used to drive the coolant to cool the engine; the water pump 600 is arranged in front of the balance shaft 500, which advantageously shortens the total design length of the coolant pipeline, can directly cool the engine, saves pipeline materials, reduces the pipeline while achieving compactness, and improves the water cooling performance and emissions of the engine.

[0090] In some embodiments of the present application, the engine further comprises:

[0091] The oil pump 700 is located at the rear and lower part of the crankshaft 200 .

[0092] The oil pump 700 is closest to the filter and the oil supply point (crankshaft 200 and balance shaft 500), and the required delivery pipeline is short, which can make the engine more compact and improve the lubrication effect of the crankshaft 200 and the balance shaft 500 in the engine.

[0093] The oil pump 700 is arranged at the rear and lower part of the crankshaft 200. Since the countershaft 300 is located above the line connecting the center of the crankshaft 200 and the center of the output shaft 100, the oil pump 700 will not hinder the arrangement of the primary gear on the countershaft 300, and thus will not increase the width of the engine, thereby achieving the compactness of the engine.

[0094] The crankshaft 200 drives the blades of the oil pump 700 , so that the crankshaft 200 can drive the oil pump 700 to work.

[0095] In some embodiments of the present application, the engine further comprises:

[0096] A first housing, on which the output shaft 100, the crankshaft 200, the countershaft 300 and the oil pump 700 are all disposed;

[0097] The second box body is connected to the first box body by a plurality of bolts to achieve box closing.

[0098] The first housing and the second housing are fastened by a plurality of bolts to form an engine, so that the output shaft 100, the crankshaft 200, the countershaft 300, the oil pump 700 and the like are arranged in the engine after the housing is assembled.

[0099] In some embodiments of the present application, the engine further comprises:

[0100] The crankshaft 200 is rotatably mounted on the bearing seat via a bearing, wherein a bolt of a closing box passes through the bearing seat.

[0101] The bearing seat is installed in the first housing, and the crankshaft 200 is rotatably installed on the bearing seat through a bearing, so that the crankshaft 200 can rotate.

[0102] Among the studs of the box, one of them passes through the bearing seat for installation.

[0103] In some embodiments of the present application, the oil pump 700 is adjacent to the bolts that pass through the bearing seat.

[0104] The oil pump 700 is adjacent to the bolts of the bearing seat, so that the introduction path of the oil pump 700 is shorter and efficient oil supply can be achieved.

[0105] In some embodiments of the present application, the engine comprises:

[0106] A first gear 101, wherein the first gear 101 is mounted on the crankshaft 200;

[0107] a second gear 201 , the second gear 201 meshing with the first gear 101 , and the second gear 201 is mounted on the balance shaft 500 ;

[0108] a third gear 301 , the third gear 301 being meshed with the first gear 101 and being mounted on the countershaft 300 ;

[0109] The crankshaft 200 drives the balance shaft 500 through the first gear 101 and the second gear 201 , and the crankshaft 200 drives the countershaft 300 through the first gear 101 and the third gear 301 .

[0110] The power of the crankshaft 200 drives the countershaft 300 via the first gear 101 and the third gear 301, and the countershaft 300 transmits the power to the engine output shaft 100 to drive the vehicle. In the transmission system of this embodiment, the gear specifically used for transmission with the balance shaft 500 is eliminated from the crankshaft 200. Instead, power is transmitted to the balance shaft 500 via the first gear 101 through the second gear 201 and to the countershaft 300 via the third gear 301. This makes the engine more compact in width and can be retracted inward from the left side of the engine, reducing the space occupied by the engine in width and improving the compactness and lightweight of the engine. On the one hand, it can provide a better driving experience, and on the other hand, it achieves lightweighting, which is beneficial to the vehicle's operability, power, economy, and emission performance. This effectively solves the technical problem of the transmission system in the related art, in which the gear set connecting the crankshaft 200 and the balance shaft 500 is located on one side of the engine, while the other gear set connecting the crankshaft 200 and the countershaft 300 is located on the other side of the engine, thereby increasing the overall width of the engine and reducing its compactness.

[0111] The first gear 101 is mounted on the crankshaft 200 by welding or spline connection, the second gear 201 is mounted on the balance shaft 500 by welding or spline connection, and the third gear 301 is mounted on the countershaft 300 by welding or spline connection.

[0112] The crank-connecting rod mechanism converts the reciprocating motion of the piston into rotational motion, and outputs rotational power through the crankshaft 200, wherein the first gear 101, the second gear 201 and the third gear 301 are coplanar to form a first-layer transmission pair, which are all located on the right side of the engine, that is, on the right side of the crankshaft 200, the countershaft 300 and the balance shaft 500, wherein a clutch is arranged in the middle and left side of the countershaft 300. By arranging the transmission of the first gear 101, the second gear 201 and the third gear 301 on the right side of the clutch, there is no need to configure additional space for the clutch due to the need to assemble the gear pair, thereby effectively minimizing the height of the clutch side, further improving the compactness and lightweight of the engine.

[0113] In some embodiments of the present application, the engine comprises:

[0114] The first sprocket 102 is mounted on the crankshaft 200;

[0115] a second sprocket connected to the first sprocket 102 via a chain and configured to be mounted on the camshaft;

[0116] The fourth gear 202 is mounted on the balance shaft 500 and is located to the right of the second gear 201;

[0117] The fifth gear 401 is meshed with the fourth gear 202 and is mounted on the water pump 600 , so that the balance shaft 500 drives the water pump 600 to work via the fourth gear 202 ;

[0118] Among them, the balance shaft 500 is placed at the front of the engine.

[0119] The first sprocket 102 is mounted on the crankshaft 200 by welding or spline connection; the first sprocket 102 is driven to rotate by the crankshaft 200, and the second sprocket is mounted on the camshaft by welding or spline connection, and the first sprocket 102 and the second sprocket are driven by a chain, wherein the first sprocket 102 is arranged at the position of the first gear 101, and the chain cavity is slightly outside, but does not affect the human-machine interface, and can be set at the upper right side of the secondary shaft 300, which can effectively improve the compactness of the engine.

[0120] The fourth gear 202 is mounted on the balancing shaft 500 by welding or spline connection, and rotates with the balancing shaft 500; the fifth gear 401 is mounted on the rotating shaft of the water pump 600 by welding or spline connection, and is used to drive the impeller of the water pump 600 to rotate. The fourth gear 202 is located on the right side of the second gear 201, and the balancing shaft 500 is placed at the front of the engine. The water pump 600 is driven to work by driving the fifth gear 401 through the fourth gear 202 arranged at the upper right end of the balancing shaft 500.

[0121] The first sprocket 102, the fourth gear 202 and the fifth gear 401 are all located within a preset range, that is, the first sprocket 102, the fourth gear 202 and the fifth gear 401 do not interfere with each other in height, and can be arranged within the preset range so that the first sprocket 102, the fourth gear 202 and the fifth gear 401 form a second layer, wherein the second layer is adjacent to the above-mentioned first layer.

[0122] In some embodiments of the present application, the engine comprises:

[0123] The sixth gear 103 is mounted on the crankshaft 200;

[0124] The seventh gear 501 is engaged with the sixth gear 103 and is mounted on the oil pump 700;

[0125] The crankshaft 200 drives the oil pump 700 through the sixth gear 103 and the seventh gear 501 .

[0126] The sixth gear 103 is mounted on the crankshaft 200 by welding or spline connection, and rotates with the crankshaft 200. The seventh gear 501 is mounted on the rotating shaft of the oil pump by welding or spline connection, and is used to drive the rotating shaft of the oil pump to drive the rotation of the oil pump, thereby driving the oil pump to work. The seventh gear 501 is mounted on the outermost side of the crankshaft 200 and is located inside the skirt of the oil pump, so as not to increase the height of the engine and to more reasonably configure the positions of the oil pump and the sixth gear 103 and the seventh gear 501 that drive the oil pump. Since there is no need to arrange the oil pump 700 and the water pump 600 behind the crankshaft 200, the distance from the crankshaft 200 to the secondary shaft 300 is shortened, and the front-to-back direction of the engine is compacted. The sixth gear 103 and the seventh gear 501 form the third layer.

[0127] The present invention also provides a motorcycle, comprising the engine as described above;

[0128] By adopting the engine as described above, the motorcycle can effectively solve the technical problem in the prior art that the shift fork shaft 800 and the shift cam bearing 801 are separated from the engine due to movement, thereby causing damage to the shifting function.

[0129] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engine, characterized in that: The engine comprises: output shaft; a crankshaft, the crankshaft being located in front of the output shaft; a countershaft, the countershaft being located above a line connecting a center of the crankshaft and a center of the output shaft; a shift shaft, the shift shaft being located below a line connecting the center of the crankshaft and the center of the output shaft; a shift trend sensor, the shift trend sensor being located behind the shift shaft; a shift fork shaft, the shift fork shaft being located below the output shaft and the countershaft; a shift cam bearing, the shift cam bearing being located below the output shaft and the countershaft; a baffle, the baffle being arranged on the outer sides of the shift fork shaft and the shift cam bearing; The center of the crankshaft, the center of the secondary shaft, and the center of the output shaft are connected to form a triangle.

2. The engine according to claim 1, characterized in that The baffle is fixedly connected to the engine by locking bolts, and the centers of the three locking bolts are connected to each other to form a triangle. The locking bolts include a first bolt, a second bolt and a third bolt, wherein the outer arc portion of the mounting hole of the third bolt protrudes.

3. The engine according to claim 1, characterized in that A line connecting the center of the crankshaft and the center of the output shaft is arranged at a preset angle to a horizontal plane.

4. The engine according to claim 1, characterized in that The engine further comprises: A balance shaft is arranged in front of the crankshaft.

5. The engine according to claim 4, characterized in that The engine further comprises: A water pump is provided in front of the balance shaft, and a line connecting a center of the water pump and a center of the countershaft is located above the crankshaft.

6. The engine according to claim 5, characterized in that The engine further comprises: An oil pump is located at the rear and lower part of the crankshaft.

7. The engine according to claim 6, characterized in that The engine comprises: a first gear, the first gear being mounted on the crankshaft; a second gear, the second gear meshing with the first gear and mounted on the balance shaft; a third gear, the third gear meshing with the first gear and mounted on the countershaft; The crankshaft drives the balance shaft through the first gear and the second gear, and the crankshaft drives the countershaft through the first gear and the third gear.

8. The engine according to claim 7, characterized in that The engine comprises: a first sprocket mounted on the crankshaft; a second sprocket connected to the first sprocket via a chain and configured to be mounted on the camshaft; a fourth gear, mounted on the balance shaft and located to the right of the second gear; a fifth gear, meshing with the fourth gear, mounted on the water pump, and configured for the balance shaft to drive the water pump via the fourth gear; Among them, the balance shaft is placed at the front of the engine.

9. The engine according to claim 7 or 8, characterized in that The engine comprises: a sixth gear, mounted on the crankshaft; a seventh gear, meshing with the sixth gear and mounted on the oil pump; Wherein, the crankshaft drives the oil pump through the sixth gear and the seventh gear.

10. A motorcycle, characterized in that: The motorcycle comprises: An engine as claimed in any one of claims 1 to 9.

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