Motorcycle single-cylinder engine and motorcycle

Abstract

The utility model belongs to the technical field of motorcycle engines, and particularly discloses a motorcycle single-cylinder engine and a motorcycle. The single-cylinder engine of the motorcycle comprises a shell assembly, the cylinder assembly is arranged on the shell assembly, the crankshaft is arranged in the shell assembly, a first balancing weight is arranged on the crankshaft, a driving gear is arranged on the crankshaft, a driven gear is arranged in the shell assembly, a second balancing weight is integrally arranged on the driven gear, and a first timing chain wheel used for driving a cam shaft to rotate is arranged on the balance shaft; the clutch assembly is arranged in the shell assembly and located on one side of the air cylinder assembly. The driven gear is arranged on the balance shaft and can be driven by the driving gear to rotate, and the second balancing weight and the driven gear are integrally arranged, so that the structure on the whole balance shaft is more compact, the overall size and weight of an engine are reduced, the lightweight performance of the engine is improved, and the service life of the engine is prolonged. And meanwhile, the assembly difficulty can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motorcycle engine technical field especially a kind of motorcycle single cylinder engine and motorcycle. BACKGROUND

[0002] Engine is an important component of motorcycle, and its main function is to convert the chemical energy of fuel into mechanical energy to drive the motorcycle. The engine produces heat energy by burning gasoline or diesel fuel, and then converts it into mechanical energy to drive the rear wheel of the motorcycle, so that the motorcycle can move forward.

[0003] The internal structure of motorcycle engine realizes the cycle of fuel entering, burning and discharging through crankshaft assembly and cylinder assembly. In the prior art, balance shafts for damping, water pumps for heat dissipation and other components are arranged inside the engine housing, but they are arranged separately inside the engine housing, which has low integration performance, resulting in the expansion of the size of the engine, the realization of assembly and the cooperation of each part, and the weight of the engine is heavier, which cannot meet the demand of lightweight and small size of the engine of racing or imitation racing motorcycle. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a motorcycle single cylinder engine and motorcycle to solve the problem of low integration performance of internal components of motorcycle engine in the prior art, resulting in large size and heavy weight of engine.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a motorcycle single cylinder engine, which comprises:

[0006] A housing assembly;

[0007] A cylinder assembly is arranged on the housing assembly, which comprises a cylinder and a camshaft, and the camshaft is provided with an intake cam and an exhaust cam;

[0008] A crankshaft is arranged in the housing assembly, and the crankshaft is provided with a first counterweight, a driving gear and a first timing chain wheel for rotating the camshaft.

[0009] A clutch assembly is arranged in the housing assembly and located on one side of the cylinder assembly.

[0010] Optionally, the balance shaft is provided with a water pump impeller, the water pump impeller is arranged at one end of the driven gear away from the timing sprocket, the second counterweight is arranged on one side of the driven gear close to the water pump impeller, the second counterweight comprises a first boss and a second boss, the first boss is integrally arranged on the first gear, the first boss extends circumferentially on the first gear with the axis of the first gear as the center, and the second boss extends vertically on the first boss in the direction of the first gear to the water pump impeller, and the width of the second boss is smaller than that of the first boss.

[0011] Optionally, the included angle between the symmetry plane of the first counterweight and the symmetry plane of the second counterweight is ±2°.

[0012] Optionally, the camshaft is provided with a flange plate, the flange plate is provided with a weight block, the camshaft is provided with a valve core shaft penetrating through the flange plate, the flange plate is provided with a limiting assembly, the limiting assembly comprises a limiting block and a limiting bearing, the limiting block is arranged on the flange plate, the limiting block is provided with a clamping groove, the limiting bearing is arranged in the clamping groove, and the valve core shaft penetrates through the limiting bearing.

[0013] Optionally, the cylinder assembly comprises a cylinder body, a cylinder head and a cylinder cover arranged in sequence from bottom to top, and the cylinder is inclined towards the direction close to the clutch along the extension direction of the cylinder body to the cylinder cover, the cylinder head is provided with an air inlet on the side away from the clutch, and the cylinder head is provided with an air outlet arranged opposite to the air inlet.

[0014] Optionally, the cylinder head is provided with an intake valve and an exhaust valve, and the cylinder head is further provided with a rocker arm assembly, the rocker arm assembly comprises an intake rocker arm and an exhaust rocker arm, the intake rocker arm comprises a first roller and an intake rocker arm body, the intake rocker arm body is rotationally connected to the cylinder head, the first roller is rotationally connected to the intake rocker arm body, the first roller corresponds to and abuts against the intake cam, is located above the intake cam, and the intake rocker arm body has an intake pushing part which is symmetrically arranged and corresponds to the intake valve.

[0015] Optionally, the exhaust rocker arm comprises a second roller and an exhaust rocker arm body, the exhaust rocker arm body is rotationally connected to the cylinder head, the second roller is rotationally connected to the exhaust rocker arm body, the second roller corresponds to and abuts against the exhaust cam, is located above the exhaust cam, the second roller is arranged in bias close to the flange plate relative to the center of the exhaust rocker arm body, and the exhaust rocker arm body has a pair of exhaust pushing parts corresponding to the exhaust valve.

[0016] Optionally, the clutch assembly includes an end cover and a push rod, a sealing block is provided between the end cover and the push rod, a hydraulic groove is provided between the sealing block and the end cover, an oil supply channel communicating with the hydraulic groove is provided on the end cover, and a return spring is provided between the end cover and the inner bottom of the hydraulic groove.

[0017] Optionally, the camshaft is provided with a second timing sprocket, and a chain is wound between the first timing sprocket and the second timing sprocket.

[0018] This utility model also proposes a motorcycle that includes the aforementioned single-cylinder motorcycle engine.

[0019] As described above, the single-cylinder engine and motorcycle proposed in this utility model have the following beneficial effects:

[0020] (1) Compared with the prior art, the present invention can rotate under the drive of the driving gear by setting the driven gear on the balance shaft. The second counterweight is integrated with the driven gear, making the structure on the entire balance shaft more compact, the length of the balance shaft shorter, and the weight lighter. At the same time, integrating the first timing sprocket into the balance shaft can also save the internal space of the engine. Therefore, the overall size and weight of the engine are reduced, and the lightweight performance of the engine is improved.

[0021] (2) Compared with the prior art, this utility model integrates the first timing sprocket and the second counterweight onto the balance shaft, making it more convenient to assemble the engine. There is no need to consider the assembly of each component. After the balance shaft is assembled into the housing assembly, each component can perform its corresponding function, reducing the assembly difficulty of the engine and the manual load. Attached Figure Description

[0022] Figure 1 The diagram shown is a schematic representation of the overall structure of an embodiment of the present invention.

[0023] Figure 2 The diagram shown is a schematic representation of the internal structure of an embodiment of the present invention.

[0024] Figure 3 The diagram shows a schematic of the crankshaft and balance shaft fitting structure in one embodiment of the present invention.

[0025] Figure 4 Displayed as Figure 3 A schematic diagram of the back structure;

[0026] Figure 5 The diagram shown is a structural schematic of a timing connector in one embodiment of the present invention.

[0027] Figure 6 Displayed as Figure 4Enlarged view of point A in the image;

[0028] Figure 7 Displayed as Figure 2 Side view;

[0029] Figure 8 The diagram shown is a structural schematic of the camshaft and limiting assembly in one embodiment of the present invention.

[0030] Figure 9 Displayed as Figure 7 A sectional view;

[0031] Figure 10 The diagram shown is a structural schematic of a camshaft in one embodiment of the present invention.

[0032] Figure 11 The diagram shown is a schematic representation of the internal structure of a cylinder in one embodiment of the present invention.

[0033] Figure 12 The diagram shown is a structural schematic of the second timing sprocket in one embodiment of the present invention.

[0034] Figure 13 The image shown is a top view of the internal structure of a cylinder in one embodiment of this utility model.

[0035] Figure 14 The image shown is a cross-sectional view of a cylinder according to an embodiment of the present invention.

[0036] Figure 15 The diagram shown is a structural schematic of a clutch in one embodiment of the present invention.

[0037] Figure 16 The image shown is a cross-sectional view of the clutch in one embodiment of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] The housing assembly 1, the cylinder block 2, the cylinder head 3, the cylinder cover 4, the air inlet 5, the air outlet 6, the crankshaft 7, the crank arm 8, the first counterweight 9, the connecting rod 10, the driving gear 11, the balance shaft 12, the driven gear 13, the shaft sleeve 14, the first timing sprocket 15, the chain 1501, the second counterweight 16, the first boss 1601, the second boss 1602, the water pump impeller 17, the camshaft 18, the limiting groove 1801, the mounting groove 1802, the second timing sprocket 1803, the valve core shaft 19, the shifting lever 1901, the flange plate 20, the exhaust cam 21, the intake cam 22, the weight block 23, the fixing groove 2301, the limiting bearing 24, the limiting block 25, the intake rocker arm body 26, the first roller 27, the exhaust rocker arm body 28, the second roller 29, the intake valve 30, the exhaust valve 31, the fixed spring 32, the piston 33, the combustion chamber 34, the end cover 35, the oil delivery channel 36, the sealing block 37, the hydraulic groove 3701, the reset spring 38, the sealing ring 39, the push rod 40. DETAILED DESCRIPTION

[0040] Other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the present specification based on different viewpoints and applications, without departing from the spirit of the present application.

[0041] It should be noted that the drawings provided in the present embodiment only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout pattern of the components can also be more complex. The structure, proportion and size shown in the drawings of the present specification are only used to cooperate with the content disclosed in the present specification, so as to be understood and read by those skilled in the art, and do not limit the implementation conditions of the present application, and therefore do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for the convenience of clear description, and do not limit the scope of the implementation of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the scope of the implementation of the present application.

[0042] As shown in Figures 1-16 The present application provides a motorcycle single-cylinder engine and a motorcycle.

[0043] In an exemplary embodiment, the motorcycle single-cylinder engine comprises:

[0044] a housing assembly 1;

[0045] a cylinder assembly, the cylinder assembly is arranged on the housing assembly 1, and the cylinder assembly comprises a cylinder and a camshaft 18, the camshaft 18 is provided with an intake cam 22 and an exhaust cam 21;

[0046] a crankshaft 7 arranged in the housing assembly 1, the crankshaft 7 is provided with a first counterweight 9, the crankshaft 7 is provided with a driving gear 11, the housing assembly 1 is provided with a timing connecting piece, the timing connecting piece comprises a balance shaft 12 and a driven gear 13 arranged on the balance shaft 12, the driven gear 13 is integrally provided with a second counterweight 16, and the balance shaft 12 is provided with a first timing sprocket 15 for driving the camshaft 18 to rotate;

[0047] a clutch assembly arranged in the housing assembly 1 and located on one side of the cylinder assembly.

[0048] In the embodiment, the driven gear 13 arranged on the balance shaft 12 can be driven to rotate by the driving gear 11, the second counterweight 16 is integrally arranged with the driven gear 13, so that the structure of the entire balance shaft 12 is more compact, the length of the balance shaft 12 is shorter, and the weight is lighter, at the same time, the first timing sprocket 15 is integrated on the balance shaft 12, which can also save the internal space of the engine, so that the overall size and weight of the engine are reduced, and the lightweight performance of the engine is improved.

[0049] At the same time, in the embodiment, the first timing sprocket 15 and the second counterweight 16 are integrated on the balance shaft 12, which is more convenient for assembling the engine, and there is no need to consider the assembly of each part, after the balance shaft 12 is assembled into the housing assembly 1, each part can realize the corresponding function, which reduces the assembly difficulty and labor load of the engine.

[0050] It is worth noting that the balance shaft 12 is provided with a shaft sleeve 14, the shaft sleeve 14 is connected with the balance shaft 12, and the driven gear 13 and the first timing sprocket 15 are arranged on the shaft sleeve 14, wherein the driven gear 13 and the first timing sprocket 15 can be connected with the shaft sleeve 14 in a separate manner or integrally formed on the shaft sleeve 14, in the embodiment, the first timing sprocket 15 and the driven gear 13 are integrally arranged on the shaft sleeve 14, when fixed, only the shaft sleeve 14 is connected with the balance shaft 12, and the first timing sprocket 15 and the driven gear can be installed, this assembly method can improve the assembly efficiency of each part, and the overall performance of the balance shaft 12 can be improved.

[0051] In an exemplary embodiment, the water pump impeller 17 is arranged on the balance shaft 12, and is arranged at the end of the balance shaft 12 away from the first timing sprocket 15 on the side of the driven gear 13 away from the timing sprocket. The second counterweight 16 is arranged on the side of the driven gear 13 close to the water pump impeller 17. The second counterweight 16 comprises a first boss 1601 and a second boss 1602. The first boss 1601 is integrally arranged on the first gear, and extends circumferentially on the first gear with the axis of the first gear as the center. The second boss 1602 extends perpendicularly on the first boss 1601 in the direction of the water pump impeller 17 along the first gear. The width of the second boss 1602 is smaller than the width of the first boss 1601.

[0052] In the embodiment, the second counterweight 16 is mainly used to ensure the smooth operation of the engine. Specifically, in the embodiment, the second counterweight 16 is integrated into the right side wall of the driven gear 13, and is installed synchronously with the driven gear 13.

[0053] For example, in the embodiment, the second counterweight 16 comprises two parts. The first part is arranged circumferentially on the first gear, and has a ring shape. The second boss 1602 is a boss formed by extending the outer edge part of the first boss 1601 in the direction of the water pump impeller 17 along the axis of the first gear. The width of the second boss 1602 is smaller than the width of the first boss 1601, so that the second boss 1602 can be away from the shaft sleeve 14, thereby facilitating the installation of the water pump impeller 17.

[0054] It is worth noting that if the width of the first boss 1601 is insufficient, a part of the second boss 1602 can extend to the surface of the driven gear 13. However, in the design, the matching relationship between the power gear and the driven gear should not be affected, so as to ensure the normal rotation of the balance shaft 12. In addition, the inner edge of the first boss 1601 can be integrally arranged on the shaft sleeve 14, thereby improving the overall performance of the connecting piece.

[0055] It is also worth noting that the size of the ring-shaped second counterweight 16 is adaptively set according to the specific model of the engine. The size (i.e., the circumferential extension angle) of the second counterweight 16 can be adjusted according to the size and performance requirements of the engine.

[0056] It should be noted that in the embodiment, when located at the top dead center, the first counterweight 9 and the second counterweight 16 have a certain included angle, which is defined as the target angle, and the target angle is in the range of ±2°. During the rotation of the driven gear 13 driven by the driving gear 11, the first counterweight 9 dampens and reduces the noise of the crankshaft 7 assembly, and the second counterweight 16 rotates synchronously under the drive of the crankshaft 7. The corresponding relationship between the second counterweight 16 and the first counterweight 9 can further cancel the inertia of the crankshaft 7, so that the damping effect of the entire engine assembly is better, and the noise generated during driving is smaller.

[0057] For example, in the embodiment, the target angle is 1°.

[0058] For example, in the embodiment, the target angle is -1°.

[0059] In an exemplary embodiment, the camshaft 18 is provided with a flange plate 20, the flange plate 20 is provided with a flyweight 23, the camshaft 18 is provided with a valve core shaft 19 penetrating the flange plate 20, the flange plate 20 is provided with a limiting assembly, the limiting assembly includes a limiting block 25 and a limiting bearing 24, the limiting block 25 is arranged on the flange plate 20, the limiting block 25 is provided with a clamping groove, the limiting bearing 24 is arranged in the clamping groove, and the valve core shaft 19 penetrates the limiting bearing 24.

[0060] For example, a limiting groove 1801 is formed on the outer circumferential surface of the camshaft 18 in the axial direction of the camshaft 18, the limiting groove 1801 extends from the end of the camshaft 18 to the direction of the exhaust cam 21, the limiting groove 1801 is mainly used for assembling the camshaft 18, and a mounting groove 1802 is also formed on the camshaft 18, the mounting groove 1802 extends along the end of the limiting groove 1801 to the direction of the exhaust cam 21 until it meets the avoiding groove, and the mounting groove 1802 is used for mounting the valve core shaft 19, wherein the valve core shaft 19 can rotate in the mounting groove 1802, the valve core shaft 19 is rotatably connected to the camshaft 18, the valve core shaft 19 penetrates the flange plate 20, and the end of the valve core shaft 19 enters the exhaust cam 21, and the avoiding groove is formed on the exhaust cam 21 to accommodate the valve core shaft 19.

[0061] In the embodiment, the limiting bearing 24 is arranged to limit the axial and radial directions of the valve core shaft 19. Since the valve core shaft 19 needs to rotate to realize the corresponding function, and due to assembly, long-term wear and other reasons, a certain movement space is arranged in each movement direction of the valve core shaft 19. The valve core shaft 19 is prone to over-rotation or rotation out of position during operation, thereby causing the valve to open prematurely during normal operation of the engine. The limiting bearing 24 can limit the axial and radial directions of the valve core, thereby ensuring the stability of the valve core shaft 19.

[0062] Exemplarily, in an example embodiment, the limiting block 25 is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion form a limiting space, the free end of the flail block 23 can rotate around the rotation center of the flail block 23 in the limiting space, the flail block 23 is provided with a fixed groove 2301, and the first protrusion penetrates through the fixed groove 2301. At the same time, the valve core shaft 19 is provided with a lever 1901, the lever 1901 penetrates through the transition part and enters the fixed groove 2301, and the lever 1901 can swing in the overlapping area of the fixed groove 2301 and the limiting space under the driving of the flail block 23.

[0063] It is worth noting that, in the embodiment, the limiting space limits the free end of the flail block 23 to swing between the overlapping area of the limiting space and the fixed groove 2301, thereby limiting the flail block 23, limiting the rotation angle of the lever 1901, and limiting the rotation angle of the valve core shaft 19.

[0064] It is also worth noting that the joint of the limiting groove 1801 and the mounting groove 1802 forms a step, which has two functions, the first is to mount the bearing, the inner end surface of the bearing abuts against the step, facilitating the positioning of the bearing, and the second is to mount the camshaft 18, when the camshaft 18 penetrates through the flange plate 20, the limiting groove 1801 can avoid the limiting bearing 24, so that the camshaft 18 can smoothly penetrate through the flange plate 20 and be fixed with the flange plate 20.

[0065] In an example embodiment, the cylinder assembly includes a cylinder body 2, a cylinder head 3 and a cylinder cover 4 arranged in sequence from bottom to top, the cylinder body 2 is provided with a piston 33, the piston 33 can be driven by the crankshaft 7 to make reciprocating up-down movement in the cylinder body 2 along its own axial direction, wherein the top of the piston 33, the inner wall of the cylinder body 2 and the bottom of the cylinder head 3 jointly form a combustion chamber 34. In the extension direction of the cylinder body 2 to the cylinder cover 4, the cylinder body 2 is inclined towards the clutch, the overall inclination direction of the cylinder body 2 is from the lower right to the upper left, the side of the cylinder head 3 away from the clutch is provided with an air inlet 5, and the cylinder head 3 is provided with an air outlet 6 opposite to the air inlet 5.

[0066] In the embodiment, by changing the overall inclination direction of the cylinder body, the inclination direction of the cylinder body is changed from forward inclination to backward inclination, so that the overall gravity center of the engine is moved backward, thereby optimizing the overall gravity center position of the motorcycle, and the motorcycle is more flexible when driving at low speed and turning, because the axle load of the rear wheel is large, which is helpful for the control of the motorcycle, and at the same time, the burden of the front wheel is reduced, and the wear of the front wheel is reduced.

[0067] Exemplarily, the air cylinder in the embodiment changes the direction of intake and exhaust, and changes the rear-side intake to front-side intake. The front-side intake can make the intake system more direct and efficient, because the air inlet 5 is located at the front end of the motorcycle, and can directly suck fresh air in front. At the same time, it is helpful to improve the intake efficiency, especially when driving at high speed, the power of the vehicle moving forward can be used to increase the intake amount. Changing the original front-side exhaust to rear-side exhaust can help reduce the impact of the exhaust system on the weight distribution of the vehicle, because the exhaust system is usually heavy, and placing it at the rear of the vehicle can help balance the weight distribution of the vehicle and improve the handling stability. At the same time, the rear-side exhaust can reduce the heat radiation of the exhaust pipe to the passengers and the driver, and improve the driving experience.

[0068] It is worth noting that in the embodiment, the cylinder head 3 and the cylinder cover 4 can be integrated or separated.

[0069] It is also worth noting that since the clutch is arranged on the left side of the cylinder and the clutch is connected to the gearbox, which is the heavy center part of the engine, tilting the cylinder towards the clutch can help adjust the overall center of gravity of the engine to the rear, which corresponds to improving the performance of the motorcycle.

[0070] It is also worth noting that the piston 33 is provided with a connecting rod 10, which is eccentrically connected to the crank arm 8 on the crankshaft 7. When the crankshaft 7 rotates, it drives the crank arm 8 to rotate, and synchronously drives the end of the connecting rod 10 to follow the crank arm 8 to make a circular motion around the axis of the crankshaft 7. Due to the limitation of the cylinder body 2, the piston 33 is driven by the connecting rod 10 to make a reciprocating motion along the circumference of the cylinder body 2.

[0071] In an exemplary embodiment, the air cylinder head 3 is provided with an intake valve 30 and an exhaust valve 31, and further provided with a rocker assembly, which includes an intake rocker and an exhaust rocker. The intake rocker includes a first roller 27 and an intake rocker body 26, the intake rocker body 26 is rotationally connected to the air cylinder head 3, and the first roller 27 is rotationally connected to the intake rocker body 26. The first roller 27 corresponds to and abuts against the intake cam 22, and is located above the intake cam 22. The intake rocker body 26 has a symmetrically arranged intake pushing part corresponding to the intake valve 30.

[0072] In this embodiment, the engine is a single-cylinder structure, wherein the number of intake valves 30 and exhaust valves 31 is two, and through the setting of a pair of intake valves 30 and a pair of exhaust valves 31, the intake volume and exhaust volume of the entire engine are increased, more fuel can enter the combustion chamber 34 for combustion, and at the same time the space in the cylinder block 2 can be enlarged, the displacement of the motorcycle engine is increased, and through the valve core shaft 19 arranged on the camshaft 18, even if the displacement is increased due to the foregoing modification, the exhaust valve 31 can be opened in advance through the valve core shaft 19, the starting pressure in the combustion chamber 34 is reduced, and the displacement of the motorcycle single-cylinder engine is increased to 450cc. At present, a motorcycle engine with a displacement of 450cc generally needs to adopt a double-cylinder structure to achieve it, and the single-cylinder structure in this embodiment realizes lightweight and small size under the same displacement, which reflects the performance advantages of the engine in this embodiment.

[0073] Specifically: in this embodiment, through the setting of the intake rocker arm body 26, when the convex part of the intake cam 22 contacts the first roller 27 to lift the first roller 27, since the first roller 27 and the intake pushing part are located at both ends of the intake rocker arm body 26, the intake pushing part will be pressed downward (referring to the principle of seesaw), driving the intake valve 30 to move downward, so that fuel and air can smoothly enter the combustion chamber 34.

[0074] For example, as shown in Figures 10-12 The exhaust rocker arm includes a second roller 29 and an exhaust rocker arm body 28, the exhaust rocker arm body 28 is rotatably connected to the cylinder head 3, the second roller 29 is rotatably connected to the exhaust rocker arm body 28, the second roller 29 corresponds to and abuts against the exhaust cam 21 and is located above the exhaust cam 21, the second roller 29 is offset relative to the center of the exhaust rocker arm body 28 and close to the flange plate 20, and the exhaust rocker arm body 28 has a pair of exhaust pushing parts corresponding to the exhaust valve 31. The working principle of the exhaust rocker arm in this embodiment is the same as that of the above-mentioned intake rocker arm, except that the second roller 29 is offset and the exhaust pushing parts are no longer symmetrically arranged, one of the exhaust pushing parts extends from the other and is in an inclined state. This structure can shorten the distance between the first roller 27 and the second roller 29, thus shortening the distance between the intake cam 22 and the exhaust cam 21, ultimately shortening the overall length of the camshaft 18, reducing the size required by the cylinder head 3, and reducing the overall size of the engine, thereby improving the lightweight performance of the engine and the motorcycle.

[0075] It is worth noting that in this embodiment, fixed springs 32 are arranged between the intake valves 30, the exhaust valves 31 and the cylinder head 3, and the fixed springs 32 are arranged for the intake valves 30 and the exhaust valves 31 to reset, so as to facilitate the normal work of the combustion chamber 34.

[0076] It is also to be noted that the camshaft 18 is provided with a second timing sprocket 1803, and the first timing sprocket 15 and the second timing sprocket 1803 are provided with a chain 1501 therebetween. When the balance shaft 12 rotates, the first timing sprocket 15 rotates synchronously, and the rotating power is transmitted to the second timing sprocket 1803 through the chain 1501 to drive the camshaft 18 to rotate.

[0077] In an exemplary embodiment, the clutch assembly comprises an end cover 35 and a push rod 40, a sealing block 37 is arranged between the end cover 35 and the push rod 40, a hydraulic groove 3701 is arranged between the sealing block 37 and the end cover 35, an oil inlet channel 36 is arranged on the end cover 35 and communicates with the hydraulic groove 3701, and a reset spring 38 is arranged between the end cover 35 and the inner bottom of the hydraulic groove 3701.

[0078] In the embodiment, the sealing block 37 arranged between the end cover 35 and the push rod 40 and the hydraulic groove 3701 formed between the sealing block 37 and the end cover 35 can replace the hydraulic cylinder in the clutch in the prior art, and the separately arranged hydraulic cylinder in the clutch is integrated on the end cover 35 through the sealing block 37. When the oil inlet channel 36 is connected to the hydraulic oil from the outside, the hydraulic oil enters the sealing groove and exerts pressure on the sealing block 37 to move the push rod 40, and the push rod 40 drives the clutch action mechanism in the clutch to act, so that the friction plate and the clutch plate are combined to generate greater friction and realize power transmission. When the hydraulic oil is discharged, the sealing block 37 is reset under the action of the reset spring 38, and the push rod 40 is reset synchronously, so the push rod 40 no longer acts on the clutch action mechanism, and therefore the clutch plate and the friction plate are separated. The above structure realizes the function of the clutch.

[0079] In the embodiment, the push rod 40 is arranged on the input shaft, and the input shaft is connected to the gearbox. In the embodiment, the push rod 40 can move within a certain range along the axial direction of the input shaft at the end of the input shaft.

[0080] In the embodiment, a plurality of sealing rings 39 are arranged between the sealing block 37 and the end cover 35 to prevent leakage of the hydraulic oil.

[0081] It is worth noting that in the embodiment, the oil cylinder originally arranged in the housing assembly 1 can be replaced by the oil inlet channel 36 and the sealing block 37, so that the internal space of the engine assembly can be more efficiently utilized, the size of the housing assembly 1 is smaller, the number of components inside the housing assembly 1 is smaller, the weight of the housing assembly 1 is lighter, the wiring inside the housing assembly 1 is simpler, and the lightweight performance of the engine assembly is improved.

[0082] The utility model also provides a motorcycle, it includes the single cylinder engine of above.

[0083] In summary, the utility model discloses the driven gear 13 that sets up on the balance shaft 12 can rotate under the driving of driving gear 11, and the second counterweight 16 is integrally arranged with driven gear 13, so that the structure on the whole balance shaft 12 is more compact, the length of balance shaft 12 is shorter, and the weight is lighter, simultaneously, the first positive timing sprocket 15 is integrated to balance shaft 12 also can save the internal space of engine, therefore the overall size and weight of engine are reduced, improve the lightweight performance of engine, can effectively reduce the assembly difficulty simultaneously.

[0084] The above embodiment only illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A motorcycle single cylinder engine characterized by, The application relates to a water pump with a balance shaft. The water pump comprises a housing assembly, a cylinder assembly arranged on the housing assembly, a crankshaft arranged in the housing assembly, and a clutch assembly arranged in the housing assembly and located on one side of the cylinder assembly. The cylinder assembly comprises a cylinder, a cylinder head and a cylinder cover arranged in sequence from bottom to top. The crankshaft is provided with a first counterweight, a driving gear and a first timing sprocket. The balance shaft is provided with a water pump impeller.

2. A motorcycle single cylinder engine according to claim 1, characterized in that: The second counterweight comprises a first boss and a second boss.

3. A motorcycle single cylinder engine according to claim 2, characterized in that: The first boss is integrally arranged on the first gear and extends in a circumferential direction of the first gear.

4. A single cylinder motorcycle engine as claimed in claim 1 wherein: The second boss extends perpendicularly on the first boss in a direction from the first gear to the water pump impeller.

5. A motorcycle single cylinder engine according to claim 4, characterized in that: The angle between the symmetry plane of the first counterweight and the symmetry plane of the second counterweight is 2 degrees.

6. A motorcycle single cylinder engine according to claim 5, characterized in that: The camshaft is provided with a flange plate, a flywheel, a valve core shaft, a limiting assembly and a limiting bearing. The cylinder head is provided with an air inlet and an air outlet. The cylinder head is provided with an intake valve and an exhaust valve. The cylinder head is provided with a rocker arm assembly. The rocker arm assembly comprises an intake rocker arm and an exhaust rocker arm. The intake rocker arm comprises a first roller and an intake rocker arm body. The intake rocker arm body is rotatably connected to the cylinder head. The first roller is rotatably connected to the intake rocker arm body. The first roller corresponds to the intake cam and is located above the intake cam. The intake rocker arm body has symmetrical intake push parts corresponding to the intake valve.

7. A motorcycle single cylinder engine according to claim 6, characterized in that: The exhaust rocker arm comprises a second roller and an exhaust rocker arm body, the exhaust rocker arm body is rotationally connected on the cylinder head, the second roller is rotationally connected with the exhaust rocker arm body, the second roller corresponds to and abuts against the exhaust cam, is located above the exhaust cam, the second roller is arranged close to the flange plate relative to the center of the exhaust rocker arm body, and the exhaust rocker arm body has a pair of exhaust pushing parts corresponding to the exhaust valve.

8. A single cylinder motorcycle engine as claimed in claim 1 wherein: The clutch assembly comprises an end cover and a push rod, a sealing block is arranged between the end cover and the push rod, a hydraulic groove is arranged between the sealing block and the end cover, an oil conveying channel is arranged on the end cover and communicates with the hydraulic groove, and a reset spring is arranged between the end cover and the inner bottom of the hydraulic groove.

9. A motorcycle single cylinder engine according to claim 1, characterized in that: A second timing sprocket is arranged on the camshaft, and a chain is arranged around the first timing sprocket and the second timing sprocket.

10. A motorcycle characterized by the fact that: The motorcycle single-cylinder engine comprises the motorcycle single-cylinder engine as claimed in any one of claims 1-9.

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