A motorcycle engine single cylinder structure and engine
By installing a pair of intake and exhaust valves in the motorcycle engine and a pressure relief mechanism on the camshaft, the problem of insufficient displacement was solved, and the displacement was increased to 450cc, ensuring stable engine operation and combustion efficiency.
Patent Information
- Application Number
- CN202423110825.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing motorcycle single-cylinder engines have a small displacement, which cannot meet the ever-increasing power demand.
By installing a pair of intake valves and a pair of exhaust valves in the motorcycle engine and a pressure relief mechanism on the camshaft, the displacement is increased to 450cc. At the same time, the valve stability and early opening are ensured by the limiting components, reducing the starting pressure in the combustion chamber.
It increases the engine's intake and exhaust volume, increases the space inside the cylinder, ensures the engine works normally after the displacement is increased, and improves combustion efficiency and motorcycle performance.
Smart Images
Figure CN223594281U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motorcycle engine technology, and in particular to a single-cylinder structure and engine for a motorcycle engine. Background Technology
[0002] The combustion of fuel in the cylinder of a motorcycle engine generates heat energy, which is converted into mechanical energy. This mechanical energy then drives the motorcycle wheels to rotate via the crankshaft, thus propelling the motorcycle. Due to the limited space in a motorcycle, its engines are characterized by their small size and low noise.
[0003] In the existing technology, the displacement of single-cylinder motorcycle engines is basically between 50cc and 400cc. For current racing motorcycles, single-cylinder engines are usually used, which have the advantages of small size and light weight. Since the larger the displacement, the greater the power output of the engine, the better the speed and acceleration performance of the motorcycle. Currently, the displacement of single-cylinder motorcycle engines does not meet the growing demand. In view of this, the applicant proposes a single-cylinder structure for motorcycle engines and an engine. Utility Model Content
[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a single-cylinder structure and engine for motorcycle engines, in order to solve the problem of small displacement of single-cylinder motorcycle engines in the prior art.
[0005] To achieve the above and other related objectives, this utility model provides a single-cylinder structure for a motorcycle engine, the engine including a clutch, characterized in that the single-cylinder structure includes:
[0006] A cylinder assembly, comprising a cylinder block, a cylinder head, and a cylinder cover arranged sequentially from bottom to top, wherein the cylinder head is provided with at least one intake valve and at least one exhaust valve, and a rocker arm assembly for controlling the intake valve and the exhaust valve is provided in the cylinder head.
[0007] A camshaft is disposed inside the cylinder head. The camshaft is provided with an intake cam and an exhaust cam. The camshaft is provided with a pressure relief mechanism, which includes a flange and a rocker arm hinged to the flange. A valve spindle is rotatably connected to the camshaft. The flange is provided with a limiting component for limiting the valve spindle.
[0008] Optionally, the limiting component includes a limiting block and a limiting bearing. The limiting block is disposed on the flange and has a groove. The limiting bearing is disposed in the groove and the valve spindle passes through the limiting bearing.
[0009] Optionally, the camshaft is provided with a mounting groove for mounting the valve core shaft and a limiting groove, the mounting groove extends along the axial direction of the camshaft, the limiting groove is continuously provided with the mounting groove, at least a part of the mounting groove extends into the exhaust cam, and the limiting groove has a diameter greater than that of the mounting groove.
[0010] Optionally, the cylinder body is provided with a piston, a combustion chamber is formed between the piston, the cylinder body and the cylinder head, and the intake valve and the exhaust valve can be close to or away from the combustion chamber along their own axial directions.
[0011] Optionally, the rocker arm assembly comprises an intake rocker arm and an exhaust rocker arm, and the intake rocker arm and the exhaust rocker arm are rotationally connected to the cylinder head.
[0012] Optionally, 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 and is located above the intake cam, the intake rocker arm body has symmetrical intake pushing portions corresponding to the intake valve, and the intake pushing portions are used for pushing the valve to be close to the combustion chamber.
[0013] 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 and is located above the exhaust cam, the second roller is offsetly arranged relative to the center of the exhaust rocker arm body and close to the flange plate, and the exhaust rocker arm body has a pair of exhaust pushing portions corresponding to the exhaust valve.
[0014] Optionally, the cylinder head is provided with an air inlet and an air outlet, the air inlet is arranged on the side of the cylinder head away from the clutch, and the air outlet is arranged on the side opposite to the air inlet.
[0015] Optionally, along the extension direction of the cylinder body to the cylinder head, the cylinder body is inclined to the direction close to the clutch.
[0016] The utility model also provides a kind of engine, it includes above-mentioned motorcycle engine single cylinder structure.
[0017] As described above, the utility model provides a kind of motorcycle engine single cylinder structure and engine, with following beneficial effects:
[0018] (1) Compared with the prior art, the utility model discloses a pair of air inlet valves and a pair of exhaust valves are set, the air intake and exhaust capacity of whole engine can be promoted, more fuel can enter the combustion chamber and burn, the space in the cylinder body can be enlarged synchronously, the displacement of motorcycle engine is promoted, through the pressure relief mechanism on the camshaft, even if the displacement is increased due to the foregoing modification, the exhaust valve can be opened in advance through the pressure relief mechanism, the starting pressure in the combustion chamber is reduced, and the displacement of motorcycle single cylinder engine is promoted to 450cc.
[0019] (2) Compared with the prior art, the utility model discloses a pair of air inlet valves and a pair of exhaust valves are set, the air intake and exhaust capacity of whole engine can be promoted, more fuel can enter the combustion chamber and burn, the space in the cylinder body can be enlarged synchronously, the displacement of motorcycle engine is promoted, through the pressure relief mechanism on the camshaft, even if the displacement is increased due to the foregoing modification, the exhaust valve can be opened in advance through the pressure relief mechanism, the starting pressure in the combustion chamber is reduced, and the displacement of motorcycle single cylinder engine is promoted to 450cc. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It shows the structure schematic diagram of an embodiment of the utility model;
[0021] Figure 2 It shows the internal structure schematic diagram of an embodiment of the utility model;
[0022] Figure 3 It shows the internal structure plan view of an embodiment of the utility model;
[0023] Figure 4 It shows the structure schematic diagram of air inlet valve and exhaust valve in an embodiment of the utility model;
[0024] Figure 5 It shows the section view of an embodiment of the utility model;
[0025] Figure 6 It shows the structure schematic diagram of camshaft and pressure relief mechanism in an embodiment of the utility model;
[0026] Figure 7 It shows the section view of camshaft in an embodiment of the utility model;
[0027] Figure 8 It shows the structure schematic diagram of camshaft in an embodiment of the utility model;
[0028] Figure 9 It shows the whole schematic diagram of engine in an embodiment of the utility model.
[0029] BRIEF DESCRIPTION OF DRAWINGS
[0030] Cylinder body 1, cylinder head 2, cylinder cover 3, camshaft 4, clamping groove 401, mounting groove 402, flange plate 5, limit block 6, first boss 601, second boss 602, limit bearing 7, flyweight 8, fixing groove 801, valve core shaft 9, lever 10, exhaust cam 11, intake cam 12, intake port 13, exhaust port 14, intake rocker arm 15, first roller 16, intake push part 17, exhaust rocker arm 18, second roller 19, exhaust push part 20, intake valve 21, exhaust valve 22, return spring 23, piston 24, combustion chamber 25, clutch 26. DETAILED DESCRIPTION
[0031] The implementation manner of the utility model is described below through specific examples, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the disclosure of the specification. The utility model can also be implemented or applied through different specific implementation manners, and various modifications or changes can be made to the details in the specification based on different viewpoints and applications without departing from the spirit of the utility model.
[0032] It should be noted that the diagrams provided in the embodiments only illustrate the basic concept of the utility model in a schematic manner, and only the components related to the utility model are shown in the diagrams, not the number, shape and size of the components when actually implemented. The shape, number and proportion of each component in actual implementation can be changed at will, and the layout pattern of the components can be more complex. The structure, proportion, size, etc. shown in the diagrams attached to the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and do not limit the implementation conditions of the utility model, so they 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 utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear understanding of the description, not for limiting the scope of the utility model, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the scope of the utility model.
[0033] As Figures 1-8 shown, the utility model provides a motorcycle engine single cylinder structure and engine, and the engine comprises a clutch 26.
[0034] In an exemplary embodiment, the motorcycle engine single cylinder structure comprises:
[0035] The cylinder assembly comprises a cylinder body 1, a cylinder head 2 and a cylinder cover 3 arranged in sequence from bottom to top, the cylinder head 2 is internally provided with at least one intake valve 21 and at least one exhaust valve 22, and the cylinder head 2 is internally provided with a rocker arm assembly for controlling the intake valve 21 and the exhaust valve 22;
[0036] A camshaft 4 is arranged in the cylinder head 2, the camshaft 4 is provided with an intake cam 12 and an exhaust cam 11, the camshaft 4 is provided with a pressure relief mechanism, the pressure relief mechanism comprises a flange plate 5 and a flapper 8 hinged to the flange plate 5, the camshaft 4 is rotationally connected with a valve core shaft 9, and the flange plate 5 is provided with a limiting assembly for limiting the valve core shaft 9.
[0037] In the embodiment, the intake volume and the exhaust volume of the entire engine are increased by the arranged pair of intake valves 21 and the pair of exhaust valves 22, more fuel can enter the combustion chamber 25 for combustion, the space in the cylinder body 1 can be enlarged synchronously, the displacement of the motorcycle engine is increased, and even if the displacement is increased due to the foregoing modification, the exhaust valve 22 can be opened in advance by the pressure relief mechanism, the starting pressure in the combustion chamber 25 is reduced, and the displacement of the motorcycle single-cylinder engine reaches 450cc.
[0038] Meanwhile, the limiting assembly arranged in the embodiment can ensure that the valve can be opened in advance, and at the same time, the engine will not be affected during normal operation of the engine, the combustion efficiency of the engine is ensured, and the running performance of the motorcycle is ensured.
[0039] In an exemplary embodiment, the limiting assembly comprises a limiting block 6 and a limiting bearing 7, the limiting block 6 is arranged on the flange plate 5, the limiting block 6 is provided with a clamping groove 401, the limiting bearing 7 is arranged in the clamping groove 401, and the valve core shaft 9 penetrates through the limiting bearing 7.
[0040] In the embodiment, the limiting block 6 and the limiting bearing 7 arranged on the limiting block 6 can limit the axial direction and the radial direction of the valve core shaft 9, since the valve core shaft 9 needs to rotate to realize the corresponding function, and due to assembly, long-term wear and the like, a certain movement space is arranged corresponding to each movement direction of the valve core shaft 9, the valve core shaft 9 is prone to shift during long-term operation, causing excessive rotation or rotation out of position, thereby causing the valve to be opened in advance during normal operation of the engine, and the limiting bearing 7 arranged can limit the axial direction and the radial direction of the valve core, ensuring the stability of the valve core shaft 9 and prolonging the service life of the pressure relief mechanism.
[0041] The limiting block 6 is provided with a first boss 601 and a second boss 602, which are used to limit the free end of the flail block 8. The flail block 8 is provided with a fixing groove 801, and the first boss 601 penetrates through the fixing groove 801.
[0042] The limiting block 6 is provided with a first boss 601 and a second boss 602, which are used to limit the free end of the flail block 8. The flail block 8 is provided with a fixing groove 801, and the first boss 601 penetrates through the fixing groove 801.
[0043] It is worth mentioning that the flange plate 5 is further provided with a tension spring. When the engine is normally working, the centrifugal force is greater than the elastic force of the tension spring, and the valve core shaft 9 is in a non-working position. When the engine stops, the valve core shaft 9 is in a working position. When the camshaft 4 rotates, the valve core shaft 9 rotates to the position corresponding to the second roller 19, and the exhaust valve 22 is opened in advance, the exhaust gas is discharged in advance, and the pressure in the combustion chamber 25 is reduced, thereby ensuring that the engine can still work normally after the displacement is increased.
[0044] The camshaft 4 is provided with a mounting groove 402 for mounting the valve core shaft 9. The mounting groove 402 extends along the axial direction of the camshaft 4, and the limiting groove is continuously arranged with the mounting groove 402. At least a part of the mounting groove 402 extends into the exhaust cam 11, and the diameter of the limiting groove is greater than the diameter of the mounting groove 402.
[0045] In this embodiment, the mounting groove 402 and the limiting groove are arranged in a stepped groove along the axial direction of the camshaft 4. The limiting groove is located at the end of the camshaft 4 and extends to the middle of the camshaft 4. The mounting groove 402 extends from one end of the limiting groove close to the exhaust cam 11 to the exhaust cam 11, and a part of the mounting groove 402 enters the body of the exhaust cam 11. The step formed between the limiting groove and the mounting groove 402 has two functions. First, it is used for the installation of the bearing, and the inner end surface of the bearing abuts against the step, which facilitates the positioning of the bearing. Second, it is used for the installation of the camshaft 4. When the camshaft 4 penetrates through the flange plate 5, the limiting groove can avoid the limiting bearing 7, so that the camshaft 4 can smoothly penetrate through the flange plate 5 and be fixed with the flange plate 5. The camshaft 4 and the flange plate 5 are fixed by the pin shaft on the camshaft 4.
[0046] In an exemplary embodiment, the cylinder block 1 is provided with a piston 24, and the piston 24, the cylinder block 1 and the cylinder head 2 form a combustion chamber 25. The intake valve 21 and the exhaust valve 22 can move towards or away from the combustion chamber 25 along their own axial direction.
[0047] In the embodiment, the combustion chamber 25 is formed by the space above the piston 24, the cylinder wall of the cylinder block 1 and the bottom of the cylinder head 2. In particular, the diameter of the cylinder block 1 is larger than that in the prior art, so that a larger displacement is achieved.
[0048] It is worth mentioning that, in the embodiment, the piston 24 is driven by the crankshaft to reciprocate in the cylinder block 1.
[0049] In an exemplary embodiment, the rocker arm assembly includes an intake rocker arm 15 and an exhaust rocker arm 18, both of which are rotatably connected to the cylinder head 2.
[0050] For example, the intake rocker arm 15 includes a first roller 16 and an intake rocker arm 15 body, the intake rocker arm 15 body is rotatably connected to the cylinder head 2, the first roller 16 is rotatably connected to the intake rocker arm 15 body, the first roller 16 corresponds to and abuts against the intake cam 12 and is located above the intake cam 12, the intake rocker arm 15 body has symmetrical intake pushing portions 17 corresponding to the intake valve 21, the intake pushing portions 17 are used to push the valve to approach the combustion chamber 25. In the embodiment, when the convex portion of the intake cam 12 contacts the first roller 16 to lift the first roller 16, the intake pushing portions 17 will be pressed downward (referring to the principle of seesaw) to drive the intake valve 21 to move downward, so that the fuel and air can smoothly enter the combustion chamber 25, due to the first roller 16 and the intake pushing portions 17 being located at both ends of the intake rocker arm 15 body.
[0051] For example, the exhaust rocker arm 18 includes a second roller 19 and an exhaust rocker arm 18 body, the exhaust rocker arm 18 body is rotatably connected to the cylinder head 2, the second roller 19 is rotatably connected to the exhaust rocker arm 18 body, the second roller 19 corresponds to and abuts against the exhaust cam 11 and is located above the exhaust cam 11, the second roller 19 is offset relative to the center of the exhaust rocker arm 18 body and is close to the flange plate 5, the exhaust rocker arm 18 body has a pair of exhaust pushing portions 20 corresponding to the exhaust valve 22. The principle of the exhaust rocker arm 18 in the embodiment is the same as that of the intake rocker arm 15 described above, except that the second roller 19 is offset and the exhaust pushing portions 20 are no longer symmetrical, one of the exhaust pushing portions 20 extends from the other and is in an inclined state. This structure can shorten the distance between the first roller 16 and the second roller 19, thus shortening the distance between the intake cam 12 and the exhaust cam 11, ultimately achieving the shortening of the overall length of the camshaft 4, reducing the size of the cylinder head 2, and reducing the overall size of the engine, thereby improving the lightweight performance of the engine and the motorcycle.
[0052] It is worth mentioning that in the embodiment, the intake valve 21 and the exhaust valve 22 are provided with reset springs 23 between the cylinder head 2, and the reset springs 23 are used for resetting the intake valve 21 and the exhaust valve 22, so that the combustion chamber 25 can work normally.
[0053] In an exemplary embodiment, the cylinder head 2 is provided with an air inlet 13 and an exhaust port 14, the air inlet 13 is arranged on the side of the cylinder head 2 away from the clutch 26, and the exhaust port 14 is arranged on the opposite side of the air inlet 13.
[0054] In the embodiment, the intake and exhaust routes of the engine are changed, and the original rear-side intake and front-side exhaust are changed to front-side intake and rear-side exhaust. The front-side intake can make the intake system more direct and efficient. Since the air inlet 13 is located at the front end of the entire engine, it can directly inhale fresh air in front, which helps to improve the intake efficiency, especially when driving at high speed, the power of the vehicle forward can be used to increase the intake amount. The original front-side exhaust is changed to rear-side exhaust, which helps to reduce the influence of the exhaust system on the weight distribution of the vehicle. Because the exhaust system is usually heavy, placing it at the rear of the vehicle helps to 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.
[0055] It is worth mentioning that along the extension direction of the cylinder body 1 to the cylinder head 3, the cylinder body is inclined towards the direction close to the clutch 26. The overall direction of the cylinder body is inclined from the right lower direction to the left upper direction, which is beneficial to move the center of gravity of the engine to the rear, and the motorcycle is more flexible when driving at low speed and turning. Because the axle load of the rear wheel is larger, it is helpful for the handling of the motorcycle, and at the same time, it can reduce the burden of the front wheel and reduce the wear of the front wheel, and improve the overall performance of the motorcycle.
[0056] In summary, by increasing the intake valve 21 and the exhaust valve 22, more fuel can enter the combustion chamber 25 for combustion, and at the same time, the space in the cylinder body 1 can be enlarged, and the displacement of the motorcycle engine can be improved. By setting the pressure relief mechanism on the camshaft 4, the exhaust valve 22 is opened in advance, the starting pressure in the combustion chamber 25 is reduced, and the displacement of the single-cylinder engine of the motorcycle is improved to 450cc. At the same time, the limiting assembly ensures that the pressure relief mechanism does not affect the engine during normal operation of the engine, ensures the combustion efficiency of the engine, and ensures the running performance of the motorcycle.
[0057] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.
Claims
1. A single-cylinder structure for a motorcycle engine, the engine including a clutch, characterized in that, The single-cylinder structure includes: A cylinder assembly, comprising a cylinder block, a cylinder head, and a cylinder cover arranged sequentially from bottom to top, wherein the cylinder head is provided with at least one intake valve and at least one exhaust valve, and a rocker arm assembly for controlling the intake valve and the exhaust valve is provided in the cylinder head. A camshaft is disposed inside the cylinder head. The camshaft is provided with an intake cam and an exhaust cam. The camshaft is provided with a pressure relief mechanism, which includes a flange and a rocker arm hinged to the flange. A valve spindle is rotatably connected to the camshaft. The flange is provided with a limiting component for limiting the valve spindle.
2. The single-cylinder structure of the motorcycle engine according to claim 1, characterized in that: The limiting assembly includes a limiting block and a limiting bearing. The limiting block is disposed on the flange and has a groove. The limiting bearing is disposed in the groove and the valve spindle passes through the limiting bearing.
3. The single-cylinder structure of the motorcycle engine according to claim 2, characterized in that: The camshaft is provided with a mounting groove and a limiting groove for mounting the valve core shaft. The mounting groove extends along the axial direction of the camshaft, and the limiting groove is continuously arranged with the mounting groove. At least a portion of the mounting groove extends into the exhaust cam, and the diameter of the limiting groove is larger than the diameter of the mounting groove.
4. The single-cylinder structure of the motorcycle engine according to claim 2, characterized in that: The cylinder body is equipped with a piston, and a combustion chamber is formed between the piston, the cylinder body and the cylinder head. The intake valve and the exhaust valve can move closer to or further away from the combustion chamber along their own axial direction.
5. The single-cylinder structure of the motorcycle engine according to claim 4, characterized in that: The rocker arm assembly includes an intake rocker arm and an exhaust rocker arm, both of which are rotatably connected to the cylinder head.
6. The single-cylinder structure of the motorcycle engine according to claim 5, characterized in that: The intake rocker arm includes 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 and abuts against the intake cam and is located above the intake cam. The intake rocker arm body has symmetrically arranged intake pushers that correspond to the intake valve. The intake pushers are used to push the valve closer to the combustion chamber.
7. The single-cylinder structure of the motorcycle engine according to claim 5, characterized in that: The exhaust rocker arm includes a second roller and an exhaust rocker arm body. The exhaust rocker arm body is rotatably connected to the cylinder head. The second roller is rotatably connected to the exhaust rocker arm body. The second roller corresponds to and abuts against the exhaust cam and is located above the exhaust cam. The second roller is offset from the center of the exhaust rocker arm body near the flange. The exhaust rocker arm body has a pair of exhaust pushers corresponding to the exhaust valve.
8. The single-cylinder structure of the motorcycle engine according to claim 1, characterized in that: The cylinder head is provided with an air inlet and an exhaust outlet. The air inlet is located on the side of the cylinder head away from the clutch, and the exhaust outlet is located on the opposite side of the air inlet.
9. The single-cylinder structure of the motorcycle engine according to claim 1, characterized in that: Along the extension direction of the cylinder block towards the cylinder head, the cylinder is tilted toward the direction of the clutch.
10. An engine, characterized in that: Includes the single-cylinder structure of a motorcycle engine as described in any one of claims 1-9.