Motorcycle engine

Abstract

The utility model provides a motorcycle engine, and belongs to the technical field of motorcycles. The problem that an existing motorcycle engine is not high in working reliability is solved. The motorcycle engine comprises a cylinder head and a cylinder cover, a cam shaft, a rocker arm shaft and an air inlet valve are arranged in the cylinder head, and the cylinder head is provided with a left side plate and a right side plate which are oppositely arranged in the axial lead direction of the cam shaft. The first air inlet rocker arm is matched with the first air inlet cam in an abutting mode and can drive the air inlet valve to be opened and closed, the second air inlet rocker arm is matched with the second air inlet cam in an abutting mode and is provided with a pin hole, and a linkage pin parallel to the rocker arm shaft is arranged on the first air inlet rocker arm in a penetrating mode. The edge of the upper end of the cylinder head is provided with a supporting slope gradually inclining downwards from one end close to the left side plate to the other end, and the edge of the lower end of the cylinder cover is provided with a mounting slope in butt joint fit with the supporting slope. According to the utility model, the working reliability of the engine can be improved, and the convenience of engine assembly is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of motorcycles and relates to a motorcycle engine. Background Art

[0002] A motorcycle engine is a machine that ignites the fuel mixture entering the cylinder and converts the heat energy generated by its combustion into mechanical energy, and the crankshaft transmits the power to the rear wheel of the motorcycle through the transmission mechanism to convert it into the driving power of the vehicle. When the engine is working, the crankshaft can drive the camshaft to rotate. A cam is fixed to the camshaft, and the cam abuts against one end of the rocker arm. The rotating cam can drive the valve to open and close, that is, the cam includes a base circle and a lobe. The base circle refers to the cylindrical part of the outer wheel surface on the cam, and the lobe is the part of the cam that protrudes from the base circle. That is, when the rocker arm abuts against the base circle, the valve is in a closed state, and when the lobe abuts against the rocker arm, the valve is open. The size of the valve opening on a conventional engine is fixed, that is, the valve lift is fixed, and the engine speed will change. When the engine speed increases, the demand for intake volume increases. An engine with a fixed valve lift will cause incomplete gas combustion, affecting emissions and fuel economy.

[0003] In view of the existence of the above problems, a variable valve structure is derived on the engine. Since the lift size of the intake valve is determined by the profile of the cam on the camshaft, the conventional variable valve structure on the motorcycle generally adopts two intake cams with different profiles or an intake cam with a changeable profile. The intake cams with two different profiles are switched to contact the intake rocker arm respectively, or the profile of the intake cam is changed to contact the intake rocker arm, so as to change the action posture of the intake rocker arm and thus change the intake volume. For example, a variable valve lift device for a motorcycle tappet engine disclosed in the patent document (application number: 201620498502.6) is disclosed. In the device, when the motorcycle engine is running at high speed, the high-speed cam slider overcomes the action force of the slider positioning spring, the high-speed cam slider deflects upward, the centrifugal block overcomes the action force of the centrifugal block spring to rotate to a certain extent and drives the high-speed rotating shaft to rotate, and then the high-speed rotating shaft is used to push the high-speed cam slider to deflect upward. At this time, the high-speed cam slider drives the rocker arm to rotate, so that the exhaust valve and the intake valve can be lifted. The variable valve structure has some shortcomings in actual use: the radial displacement of the high-speed cam slider is affected by the centrifugal force and the slider positioning spring and the centrifugal block spring. However, due to the extended use time or other factors, the preload force of the spring may change and the elasticity of the spring may become unstable. If the preload force changes, the reset force of the high-speed cam slider and the centrifugal block will also be affected, which may cause the high-speed cam slider to fail to reset into place and protrude from the low-speed cam surface after reset, resulting in abnormal valve lift and affecting the reliability of the variable valve structure. Summary of the invention

[0004] The purpose of the utility model is to solve the above problems in the existing technology and propose a motorcycle engine. The technical problem solved by the utility model is: how to improve the working reliability of the engine while ensuring the convenience of engine assembly.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a motorcycle engine, including a cylinder head and a cylinder cover, wherein a camshaft, a rocker arm shaft and an intake valve are arranged in the cylinder head, and the cylinder head has a left plate and a right plate arranged relatively along the axis of the camshaft, characterized in that the camshaft has an intake cam 1 and an intake cam 2, the lobe of the intake cam 2 is higher than the lobe of the intake cam 1, the rocker arm shaft is provided with an intake rocker arm 1 that abuts against the intake cam 1 and can drive the intake valve to open and close, and an intake rocker arm 2 with a pin hole abutting against the intake cam 2, and the intake rocker arm 1 is penetrated with a pin hole There is a linkage pin parallel to the rocker arm shaft; a water pump is fixedly connected to the left side plate of the cylinder head, the upper end edge of the cylinder head has a supporting inclined surface which gradually tilts downward from one end close to the left side plate to the other end, and the lower end edge of the cylinder cover has a mounting inclined surface which is butt-matched with the supporting inclined surface. The motorcycle engine also includes a drive assembly with a push rod, and the inner wall of the cylinder cover has a mounting protrusion located on the upper side of the right side plate for mounting the drive assembly, the push rod and the linkage pin are butt-jointed end faces, and the push rod can push the linkage pin into the pin hole so that the intake rocker arm 1 and the intake rocker arm 2 swing with the same amplitude.

[0006] When the motorcycle is running at low speed and the engine is at low speed, the linkage pin is in a position where it does not extend into the pin hole. At this time, the intake rocker arm 1 and the intake rocker arm 2 swing independently, and the lift of the intake valve is controlled by the intake rocker arm 1. The intake rocker arm 2 does not abut against the intake valve, so its movement does not affect the lift of the intake valve. Since the lobe of the intake cam 1 is lower, the lift of the intake valve is smaller in this process, and the intake volume is smaller. When the motorcycle is running at high speed and the engine is at high speed, the drive assembly starts to work and its push rod pushes the linkage pin. When the linkage pin is directly opposite to the pin hole, the linkage pin penetrates into the pin hole, so that the intake rocker arm 1 and the intake rocker arm 2 are combined. When the intake rocker arm 2 swings, it will lead the intake rocker arm 1 to swing with the same amplitude. Since the intake rocker arm 2 abuts against the outer peripheral surface of the intake cam 2 and the lobe tip of the intake cam 2 is higher than the lobe tip of the intake cam 1, the swing amplitude of the intake rocker arm 1 is increased to the same as the swing amplitude of the intake rocker arm 2, thereby increasing the lift of the intake valve and the intake volume, ensuring more complete engine combustion, reducing emissions, and optimizing engine performance.

[0007] The motorcycle engine is provided with a mounting protrusion on the inner wall of the cylinder head, and the mounting protrusion can be used for the installation of the drive assembly. Therefore, when assembling the engine, the drive assembly and the cylinder head can be assembled together first, and then the cylinder head cover can be closed on the cylinder head and slid upward along the inclined support slope for a certain distance until the bolt holes on the cylinder head and the bolt holes on the cylinder head are aligned, and then the fastening screws can be installed in the bolt holes. Obviously, the provision of the mounting protrusion in the utility model allows the drive assembly to be assembled with the cylinder head on the upstream assembly line to form an integral kit and then assembled with the cylinder head, so that the assembly steps are reduced when the cylinder head and the cylinder head are assembled, and the assembly is convenient and efficient. On the one hand, the inclined support bevel can play a guiding role. After the cylinder cover is closed on the cylinder head, it can guide the cylinder head to slide upward along the support bevel for a certain distance, so that the push rod and the linkage pin can smoothly achieve docking and abutment, avoiding the situation that the bottom of the push rod and the top of the linkage pin conflict, thereby making the installation more convenient; in addition, the inclined support bevel also has an avoidance effect, that is, it can make the position of the right side plate of the cylinder head lower, so that the installation convex part can be set on the inner wall of the cylinder head, thereby achieving the purpose of making the engine assembly more convenient. In addition, due to the inclined setting of the support bevel, the height of the left side plate of the cylinder head is higher, which is convenient for the installation of the water pump, so that the impeller shaft of the water pump is coaxially connected with the camshaft, thereby making the water pump easy to install.

[0008] In addition, the positions of the intake cam 1 and the intake cam 2 in the utility model will not change relative to the camshaft. Even if the motorcycle has been used for a long time, the variable range of the valve lift can always remain consistent, and there will be no abnormal intake valve lift due to the failure of the high-speed cam slider to return to its original position after a long period of use as in the patent in the background technology "A variable valve lift device for a motorcycle tappet engine (application number: 201620498502.6)". Therefore, the motorcycle engine has good reliability and working stability.

[0009] In the above-mentioned motorcycle engine, the cylinder head has a cylinder head top plate and a right side plate body arranged corresponding to the right side plate on the cylinder head, and the mounting protrusion is integrally formed at the connecting corner between the inner wall of the cylinder head top plate and the inner wall of the right side plate body. This structure not only enables the mounting protrusion to be integrally formed with the cylinder head, making the mounting protrusion easy to manufacture, but also the inner wall of the cylinder head top plate and the inner wall of the right side plate body are integrally connected with the mounting protrusion, which can improve the structural strength of the mounting protrusion and ensure the installation stability of the drive assembly. In addition, in this design, the mounting protrusion is arranged close to the edge of the cylinder head, which can reduce the occupation of the internal space of the cylinder head by the mounting protrusion, making it easier to arrange the intake valve, exhaust valve, intake rocker arm 1, intake rocker arm 2 and other components in the cylinder head, thereby making the structure more compact and the space design more reasonable.

[0010] In the above-mentioned motorcycle engine, the cylinder head also has two connecting side plates connected between the left plate and the right plate and arranged oppositely, and the cylinder head also has two cylinder head side plates, which are respectively arranged in correspondence with the two connecting side plates on the cylinder head, and the cylinder head top plate is connected between the two cylinder head side plates, and the vertical width of the two cylinder head side plates gradually decreases from one end close to the right plate body to the other end. This design not only enables the cylinder head cover to meet the airtightness requirements of the engine after being covered on the cylinder head, but also, through the change of the vertical width of the cylinder head side plates at different positions, the cylinder head top plate and the supporting inclined surface of the cylinder head are at a certain angle, which can reduce the volume of the engine, so that the motorcycle engine has the advantage of compact structure on the basis of ensuring easy assembly.

[0011] In the above-mentioned motorcycle engine, the top of the intake rocker arm 1 has a cylindrical sleeve portion, the linkage pin is slidably inserted into the sleeve portion, the pin hole is parallel to the linkage pin and matches the outer diameter of the linkage pin, and a reset spring is also provided in the sleeve portion that can drive the linkage pin to move and escape from the pin hole. The reset of the linkage pin using the reset spring has the advantages of good reliability and low cost. The sleeve portion forms a guide for the linkage pin, which can ensure that the linkage pin can stably move axially, thereby improving the stability and reliability of the variable valve structure of the engine. When assembling the cylinder head and the cylinder cover, the setting of the sleeve portion enables the linkage pin to be positioned in the sleeve portion, and during the assembly process, it is convenient for the end faces of the push rod and the linkage pin to abut against each other, thereby facilitating the assembly process. The pin hole is parallel to the linkage pin and matches the outer diameter of the linkage pin, so that after the linkage pin is inserted into the pin hole, the running trajectory of the linkage pin is consistent with the running trajectory of the pin hole, so that the intake rocker arm 1 and the intake rocker arm 2 can swing with the same amplitude.

[0012] In the above-mentioned motorcycle engine, the outer wall of the linkage pin has a guide convex edge arranged along the circumferential direction and slidingly matched with the inner wall of the sleeve part, the reset spring is sleeved on the linkage pin, and the two ends of the reset spring are respectively against the inner wall of the sleeve part and the guide convex edge, and the inner wall of the sleeve part is also connected with a retaining ring, which is located on the outer side of the guide convex edge and can be abutted by the guide convex edge. Through the sliding match between the guide convex edge and the inner wall of the sleeve part, the linkage pin can be ensured to slide axially stably, and the stability of the operation of the variable valve structure can be improved. The two ends of the reset spring are respectively against the guide convex edge and the inner wall of the sleeve part, so that the linkage pin can withdraw from the pin hole under the action of the reset spring to realize the independent swing of the intake rocker arm 1 and the intake rocker arm 2. The retaining ring can limit the movement stroke of the linkage pin, and can prevent the linkage pin from falling out of the sleeve part when assembling the cylinder head and the cylinder cover, so that the end faces of the push rod and the linkage pin can be butted against each other during the assembly process, thereby making the assembly process convenient.

[0013] In the above-mentioned motorcycle engine, the mounting protrusion has a plug-in hole and a guide hole located on the inner side of the plug-in hole and concentric with the plug-in hole. The end of the plug-in hole facing away from the guide hole penetrates the outer wall of the right side plate body. The driving assembly also includes an electromagnet inserted and positioned in the plug-in hole. The push rod is slidably arranged in the guide hole, and the electromagnet can push the push rod to move axially in the direction of the linkage pin. By setting the guide hole, the installation of the push rod is realized and a guide is formed for its axial movement, thereby ensuring that the electromagnet can drive the push rod to move stably. The end of the plug-in hole facing away from the guide hole penetrates the outer wall of the right side plate body, which can facilitate the replacement and maintenance of the electromagnet, the push rod and the oil seal on the push rod. Of course, this structure also allows the engine to install the push rod, oil seal, electromagnet and other components in sequence after the cylinder head and cylinder cover are assembled. The electromagnet is fixedly connected to the outer wall of the box cover by bolts, and at the same time the electromagnet is plugged and fixed in the plug hole, which can ensure that the electromagnet has good installation stability and avoid the electromagnet from loosening, so that the electromagnet can stably push the push rod to move, thereby improving the working reliability of the drive assembly.

[0014] In the above-mentioned motorcycle engine, the middle part of the right side plate of the cylinder head has a lower notch formed by inward concave, and the right side plate of the cylinder cover has an upper notch formed by inward concave, and the upper notch is aligned and connected with the lower notch, and a spark plug is arranged in the lower notch, and the plug hole is located on one side of the upper notch. By providing the upper and lower notches that are aligned and connected, a relatively open avoidance space is formed on the upper part of the spark plug, and the plug hole is located on one side of the upper notch, so that the electromagnet fixed in the plug hole is located obliquely above the spark plug. Through the above design, the installation and replacement of the spark plug can be made more convenient, thereby further improving the overall installation convenience of the engine.

[0015] In the above motorcycle engine, the right side plate of the cylinder head further has a mounting boss located at the top of the upper notch, the mounting boss is provided with a first screw hole, and the first screw hole is connected with a mounting screw for fixing the housing of the electromagnet. By providing the mounting boss, the stability of the installation of the electromagnet can be ensured, and the position of the electromagnet will not hinder the replacement of the spark plug, thereby ensuring that the spark plug is easy to install and replace.

[0016] In the above-mentioned motorcycle engine, a second screw hole is also provided on the right side plate, the first screw hole and the second screw hole are respectively located on both sides of the plug-in hole, the front end of the housing of the electromagnet has a mounting plate, and the first screw hole and the second screw hole are both connected with mounting screws that pass through the mounting plate and fix the mounting plate. In this design, only two mounting screws are used to install the electromagnet, and the reduction in the number of mounting screws can improve the efficiency of installation. Since there is a plug-in hole on the mounting protrusion, and the electromagnet is plugged into the plug-in hole to position the electromagnet, although the number of mounting screws is small, the electromagnet can still maintain a high installation stability for a long time, thereby improving the working reliability of the drive component.

[0017] In the above motorcycle engine, the cylinder head is fixedly connected to the cylinder head by a plurality of fastening screws respectively located at the four corners thereof, and a sealing gasket is also provided between the mounting inclined surface of the cylinder head and the supporting inclined surface of the cylinder head. This design can ensure a stable connection between the cylinder head and the cylinder head, and has a good shock absorption and silencing effect, thereby improving the mechanical performance of the motorcycle engine.

[0018] Compared with the prior art, the engine of this motorcycle has the following advantages:

[0019] 1. The motorcycle engine is provided with a mounting convex portion on the inner wall of the cylinder head, so that the drive assembly can be assembled with the cylinder head on the upstream assembly line to form an integral kit and then assembled with the cylinder head. This reduces the number of assembly steps when assembling the cylinder head and the cylinder head, and is convenient and efficient.

[0020] 2. In the utility model, the first intake cam and the second intake cam are integrally formed with the camshaft, so that even after the motorcycle has been used for a long time, the variable range of the valve lift can always remain consistent, so the motorcycle engine has good reliability and working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural diagram of the cylinder head and cylinder cover of the motorcycle engine.

[0022] Figure 2 yes Figure 1 Three-dimensional structure diagram after hiding the cylinder head.

[0023] Figure 3 It is a three-dimensional structural diagram of the cylinder head and cylinder cover of the motorcycle engine from another perspective.

[0024] Figure 4 This is an exploded view of the cylinder head and cylinder cover.

[0025] Figure 5 It is a three-dimensional structural diagram of the cylinder head.

[0026] Figure 6It is a cross-sectional view of the motorcycle engine.

[0027] Figure 7 This is a schematic diagram of the coordination of the camshaft, intake rocker arm one and intake rocker arm two.

[0028] Figure 8 It is a schematic diagram of the coordination of the camshaft, intake rocker arm one, intake rocker arm two, exhaust rocker arm and drive assembly.

[0029] Fig. 9 This is the front view of the camshaft.

[0030] Fig.10 yes Figure 6 Enlarged view of point A in the middle.

[0031] Fig.11 It is a partial cross-sectional view when the linkage pin part extends into the pin hole to combine the intake rocker arm 1 and the intake rocker arm 2.

[0032] In the figure, 1, cylinder head; 1a, left side plate; 1a1, fixing hole; 1b, right side plate; 1c, supporting inclined surface; 1d, connecting side plate; 2, cylinder head; 2a, mounting inclined surface; 2b, mounting convex part; 2c, cylinder head top plate; 2d, right side plate; 2d1, mounting convex column; 2e, cylinder head side plate; 3, camshaft; 31, intake cam 1; 32, intake cam 2; 33, exhaust cam; 34, peach tip; 4, rocker arm shaft; 5, intake valve; 6, intake rocker arm 1; 61, sleeve part; 7, intake rocker Arm 2; 8. linkage pin; 81. guide convex edge; 9. drive assembly; 91. push rod; 92. electromagnet; 921. mounting plate; 10. water pump; 11. pin hole; 12. return spring; 13. retaining ring; 14. plug-in hole; 15. guide hole; 16. lower notch; 17. upper notch; 18. spark plug; 19. first screw hole; 20. mounting screw; 21. second screw hole; 22. fastening screw; 23. sealing gasket; 24. exhaust valve; 25. exhaust rocker arm; 26. return torsion spring. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] Embodiment 1

[0035] like Figure 1As shown, the motorcycle engine includes a cylinder block, a cylinder head 1, and a cylinder cover 2 arranged in sequence from bottom to top. The cylinder block is not shown in the figure. The cylinder head 1 is provided with a camshaft 3, a rocker arm shaft 4, an intake valve 5, an exhaust valve 24, and an exhaust rocker arm 25 for controlling the opening and closing of the exhaust valve 24. The cylinder head 2 is fixedly connected to the cylinder head 1 by four fastening screws 22 respectively located at its four corners. A sealing gasket 23 is also provided between the mounting inclined surface 2a of the cylinder head 2 and the supporting inclined surface 1c of the cylinder head 1. This design can ensure the stable connection between the cylinder head 1 and the cylinder head 2, and has a good shock absorption and silencing effect, thereby improving the mechanical performance of the motorcycle engine.

[0036] like Figures 2 to 4 As shown, the cylinder head 1 has a left plate 1a and a right plate 1b which are arranged oppositely along the axis of the camshaft 3, and also has two connecting side plates 1d which are connected between the left plate 1a and the right plate 1b and are arranged oppositely. A fixing hole 1a1 is provided on the left plate 1a of the cylinder head 1, and a water pump 10 is fixedly connected to the left plate 1a of the cylinder head 1. The housing of the water pump 10 is plugged into the fixing hole 1a1. The impeller shaft of the water pump 10 is connected to the camshaft 3. When the camshaft 3 rotates, it can drive the impeller shaft of the water pump 10 and the impeller on the impeller shaft to rotate, thereby realizing the operation of the water pump 10, so that the water pump 10 pumps the refrigerant to the cylinder sleeve of the engine to cool the engine. The water pump 10 is fixedly connected in the fixing hole 1a1, and the upper end edge of the cylinder head 1 has a supporting inclined surface 1c which gradually tilts downward from one end close to the left plate 1a to the other end, and the lower end edge of the cylinder head 2 has a mounting inclined surface 2a which is butt-matched with the supporting inclined surface 1c. The cylinder head 2 has a cylinder head top plate 2c and a right side plate body 2d which is arranged up and down corresponding to the right side plate 1b on the cylinder head 1. The cylinder head 2 also has two cylinder head side plates 2e. The two cylinder head side plates 2e are respectively arranged up and down corresponding to the two connecting side plates 1d on the cylinder head 1. The cylinder head top plate 2c is connected between the two cylinder head side plates 2e. The vertical width of the two cylinder head side plates 2e gradually decreases from one end close to the right side plate body 2d to the other end.

[0037] like Figure 5 and Figure 6 As shown, the inner wall of the cylinder head 2 has a mounting protrusion 2b located on the upper side of the right side plate 1b for mounting the drive assembly 9. The mounting protrusion 2b is integrally formed at the connecting corner between the inner wall of the cylinder head top plate 2c and the inner wall of the right side plate body 2d.

[0038] like Figures 7 to 9As shown, the camshaft 3 has an exhaust cam 33, an intake cam 1 31 and an intake cam 2 32 whose lobe 34 is higher than the intake cam 1 31, and the exhaust rocker arm 25 is matched and abutted against the outer peripheral surface of the exhaust cam 33. The rocker arm shaft 4 is provided with an intake rocker arm 1 6 which abuts against the intake cam 1 31 and can drive the intake valve 5 to open and close, and an intake rocker arm 2 7 having a pin hole 11. The intake rocker arm 2 7 is sleeved with a return torsion spring 26. Under the action of the return torsion spring 26, one end of the intake rocker arm 2 7 always abuts against the intake cam 2 32. The intake rocker arm 1 6 is penetrated with a linkage pin 8 parallel to the rocker arm shaft 4; the motorcycle engine also includes a driving assembly 9 having a push rod 91, and the push rod 91 and the linkage pin 8 are abutted against each other at their end faces. The push rod 91 can push the linkage pin 8 into the pin hole 11 so that the intake rocker arm 1 6 and the intake rocker arm 2 7 swing with the same amplitude.

[0039] like Figures 7 to 9 As shown, the top of the intake rocker arm 6 has a cylindrical sleeve portion 61, and the linkage pin 8 is slidably inserted into the sleeve portion 61. The pin hole 11 is parallel to the linkage pin 8 and matches the outer diameter of the linkage pin 8. A return spring 12 is also provided in the sleeve portion 61, which can drive the linkage pin 8 to move and escape from the pin hole 11.

[0040] like Fig.10 As shown, the outer wall of the linkage pin 8 has a guide protrusion 81 which is arranged along the circumferential direction and slides with the inner wall of the sleeve part 61. The return spring 12 is sleeved on the linkage pin 8. The two ends of the return spring 12 respectively abut against the inner wall of the sleeve part 61 and the guide protrusion 81. The inner wall of the sleeve part 61 is also connected with a retaining ring 13, which is located on the outer side of the guide protrusion 81 and can be abutted by the guide protrusion 81. The guide protrusion 81 slides with the inner wall of the sleeve part 61 to ensure the stable axial sliding of the linkage pin 8 and improve the stability of the variable valve structure. The two ends of the return spring 12 abut against the guide protrusion 81 and the inner wall of the sleeve part 61, so that the linkage pin 8 can withdraw from the pin hole 11 under the action of the return spring 12 to realize the independent swing of the intake rocker arm 1 6 and the intake rocker arm 2 7.

[0041] like Figure 4 and Fig.10 As shown, the mounting protrusion 2b has a plug hole 14 and a guide hole 15 located on the inner side of the plug hole 14 and concentric with the plug hole 14, and the end of the plug hole 14 facing away from the guide hole 15 passes through the outer wall of the right side plate 2d, and the drive assembly 9 also includes an electromagnet 92 plugged and positioned in the plug hole 14, and a push rod 91 is slidably provided in the guide hole 15, and the electromagnet 92 can push the push rod 91 to move axially in the direction of the linkage pin 8.

[0042] like Figure 3 and Figure 4As shown, the middle part of the right side plate 1b of the cylinder head 1 has a lower notch 16 formed by inward concave, and the right side plate body 2d of the cylinder head 2 has an upper notch 17 formed by inward concave, and the upper notch 17 is aligned and connected with the lower notch 16, and a spark plug 18 is arranged in the lower notch 16, and the plug hole 14 is located on one side of the upper notch 17. By providing the upper notch 17 and the lower notch 16 that are aligned and connected, a relatively open escape space is formed on the upper part of the spark plug 18, and the plug hole 14 is located on one side of the upper notch 17, so that the electromagnet 92 fixed in the plug hole 14 is located obliquely above the spark plug 18. Through the above design, the installation and replacement of the spark plug 18 can be made more convenient, thereby further improving the installation convenience of the overall engine.

[0043] like Figure 3 and Figure 4 As shown, the right side plate 2d of the cylinder head 2 also has a mounting boss 2d1 located at the top of the upper notch 17, and the mounting boss 2d1 is provided with a first screw hole 19. The right side plate 2d also has a second screw hole 21, and the first screw hole 19 and the second screw hole 21 are respectively located on both sides of the plug hole 14. The front end of the housing of the electromagnet 92 has a mounting plate 921, and the first screw hole 19 and the second screw hole 21 are both connected with mounting screws 20 that pass through the mounting plate 921 and fix the mounting plate 921.

[0044] The following describes the working principle of the variable valve structure on this engine:

[0045] like Fig.10 As shown, when the motorcycle is running at a low speed and the engine is at a low speed, the linkage pin 8 is in a position where it does not extend into the pin hole 11. At this time, the intake rocker arm 1 6 and the intake rocker arm 2 7 swing independently, and the lift of the intake valve 5 is controlled by the intake rocker arm 1 6, while the intake rocker arm 2 7 does not abut against the intake valve 5, so its movement does not affect the lift of the intake valve 5. Since the lobe 34 of the intake cam 1 31 is relatively low, the lift of the intake valve 5 is relatively small during this process, and the intake volume is relatively small.

[0046] like Fig.11 As shown, when the motorcycle is running at high speed and the engine is at high speed, the driving component 9 starts to work so that its push rod 91 pushes the linkage pin 8. When the linkage pin 8 is opposite to the pin hole 11, the linkage pin 8 penetrates into the pin hole 11, so that the intake rocker arm 1 6 and the intake rocker arm 2 7 are combined. When the intake rocker arm 2 7 swings, it will lead the intake rocker arm 1 6 to swing with the same amplitude. Since the intake rocker arm 2 7 abuts against the outer peripheral surface of the intake cam 2 32 and the lobe portion 34 of the intake cam 2 32 is higher than the lobe portion 34 of the intake cam 1 31, the swing amplitude of the intake rocker arm 6 is increased to the same as the swing amplitude of the intake rocker arm 2 7, thereby increasing the lift of the intake valve 5 and the intake amount, ensuring more complete engine combustion, reducing emissions, and optimizing engine performance.

[0047] When the engine speed decreases, the drive assembly 9 retracts to release the linkage pin 8, and the linkage pin 8 is released from the pin hole 11 under the action of the return spring 12, and returns to the position as shown in FIG. Fig.10 In the state shown, the intake rocker arm 1 6 and the intake rocker arm 2 7 swing independently, the lift of the intake valve 5 decreases, and the intake amount decreases.

[0048] Embodiment 2

[0049] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the driving assembly 9 includes a push rod 91 and a push rod motor. The working principle of the push rod motor is to convert the rotational motion of the motor into the linear reciprocating motion of the output end. When the output end of the push rod motor extends, the push rod 91 pushes the linkage pin 8 into the pin hole 11. When the output end of the push rod motor retracts, the linkage pin 8 escapes from the pin hole 11 under the action of the reset spring 12.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0051] Although this article uses more 1, cylinder head; 1a, left side plate; 1a1, fixing hole; 1b, right side plate; 1c, supporting slope; 1d, connecting side plate; 2, cylinder head; 2a, mounting slope; 2b, mounting convex part; 2c, cylinder head top plate; 2d, right side plate; 2d1, mounting boss; 2e, cylinder head side plate; 3, camshaft; 31, intake cam 1; 32, intake cam 2; 33, exhaust cam; 34, peach tip; 4, rocker arm shaft; 5, intake valve; 6, intake rocker arm 1; 61, sleeve part; 7, intake rocker arm 2; 8, connecting rod The following terms are used, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A motorcycle engine, comprising a cylinder head (1) and a cylinder cover (2), wherein a camshaft (3), a rocker arm shaft (4) and an intake valve (5) are arranged in the cylinder head (1), and the cylinder head (1) has a left side plate (1a) and a right side plate (1b) arranged opposite to each other along the axis of the camshaft (3), characterized in that: The camshaft (3) is provided with an intake cam 1 (31) and an intake cam 2 (32), the lobe tip (34) of the intake cam 2 (32) being higher than the lobe tip (34) of the intake cam 1 (31), the rocker arm shaft (4) is provided with an intake rocker arm 1 (6) which abuts against the intake cam 1 (31) and can drive the intake valve (5) to open and close, and an intake rocker arm 2 (7) which abuts against the intake cam 2 (32) and has a pin hole (11), the intake rocker arm 1 (6) is provided with a linkage pin (8) parallel to the rocker arm shaft (4); the left side plate (1a) of the cylinder head (1) is fixedly connected with a water pump (10), and the upper end edge of the cylinder head (1) has a A supporting inclined surface (1c) is gradually inclined downward from one end of the side plate (1a) to the other end, and the lower end edge of the cylinder head (2) has a mounting inclined surface (2a) that is butt-jointed with the supporting inclined surface (1c); the motorcycle engine also includes a driving assembly (9) having a push rod (91), and the inner wall of the cylinder head (2) has a mounting protrusion (2b) located on the upper side of the right side plate (1b) for mounting the driving assembly (9), and the push rod (91) and the linkage pin (8) are butt-jointed with each other at their end faces, and the push rod (91) can push the linkage pin (8) into the pin hole (11) so that the first intake rocker arm (6) and the second intake rocker arm (7) swing with the same amplitude.

2. The motorcycle engine according to claim 1, characterized in that: The cylinder head (2) comprises a cylinder head top plate (2c) and a right side plate body (2d) arranged correspondingly to the right side plate (1b) on the cylinder head (1) from top to bottom, and the mounting protrusion (2b) is integrally formed at the connecting corner between the inner wall of the cylinder head top plate (2c) and the inner wall of the right side plate body (2d).

3. The motorcycle engine according to claim 2, characterized in that: The cylinder head (1) also has two connecting side plates (1d) connected between the left side plate (1a) and the right side plate (1b) and arranged opposite to each other. The cylinder head (2) also has two cylinder head side plates (2e). The two cylinder head side plates (2e) are arranged correspondingly to the two connecting side plates (1d) on the cylinder head (1) above and below. The cylinder head top plate (2c) is connected between the two cylinder head side plates (2e). The vertical width of the two cylinder head side plates (2e) gradually decreases from one end close to the right side plate (2d) to the other end.

4. The motorcycle engine according to claim 1, 2 or 3, characterized in that: The top of the intake rocker arm (6) is provided with a cylindrical sleeve portion (61), the linkage pin (8) is slidably inserted into the sleeve portion (61), the pin hole (11) is parallel to the linkage pin (8) and matches the outer diameter of the linkage pin (8), and a return spring (12) is also provided in the sleeve portion (61) which can drive the linkage pin (8) to move and escape from the pin hole (11).

5. The motorcycle engine according to claim 4, characterized in that: The outer wall of the linkage pin (8) is provided with a guide protrusion (81) arranged in the circumferential direction and slidingly matched with the inner wall of the sleeve portion (61); the return spring (12) is sleeved on the linkage pin (8); the two ends of the return spring (12) respectively abut against the inner wall of the sleeve portion (61) and the guide protrusion (81); the inner wall of the sleeve portion (61) is also connected with a retaining ring (13) in a clamping manner; the retaining ring (13) is located on the outer side of the guide protrusion (81) and can be abutted against by the guide protrusion (81).

6. The motorcycle engine according to claim 2 or 3, characterized in that: The mounting protrusion (2b) has a plug hole (14) and a guide hole (15) located on the inner side of the plug hole (14) and concentric with the plug hole (14); one end of the plug hole (14) facing away from the guide hole (15) passes through the outer wall of the right side plate (2d); the driving component (9) also includes an electromagnet (92) plugged and positioned in the plug hole (14); the push rod (91) is slidably arranged in the guide hole (15); the electromagnet (92) can push the push rod (91) to move axially in the direction of the linkage pin (8).

7. The motorcycle engine according to claim 6, characterized in that: The middle part of the right side plate (1b) of the cylinder head (1) has a lower notch (16) formed by inward concave, and the right side plate body (2d) of the cylinder cover (2) has an upper notch (17) formed by inward concave, the upper notch (17) and the lower notch (16) are aligned and connected with each other in the upper and lower directions, a spark plug (18) is arranged in the lower notch (16), and the plug hole (14) is located on one side of the upper notch (17).

8. The motorcycle engine according to claim 7, characterized in that: The right side plate (2d) of the cylinder cover (2) also has a mounting boss (2d1) located at the top of the upper notch (17), and the mounting boss (2d1) is provided with a first screw hole (19), and the first screw hole (19) is connected with a mounting screw (20) for fixing the housing of the electromagnet (92).

9. The motorcycle engine according to claim 8, characterized in that: The right side plate (2d) is also provided with a second screw hole (21), the first screw hole (19) and the second screw hole (21) are respectively located on both sides of the plug hole (14), the front end of the electromagnet (92) is provided with a mounting plate (921), and the first screw hole (19) and the second screw hole (21) are both connected with mounting screws (20) that pass through the mounting plate (921) and fix the mounting plate (921).

10. The motorcycle engine according to claim 1, 2 or 3, characterized in that: The cylinder cover (2) is fixedly connected to the cylinder head (1) via a plurality of fastening screws (22) respectively located at four corners thereof, and a sealing gasket (23) is also provided between the mounting inclined surface (2a) of the cylinder cover (2) and the supporting inclined surface (1c) of the cylinder head (1).

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