Rocking arm oil supply structure, engine and motorcycle

Abstract

The utility model provides a rocker arm oil supply structure, engine and motorcycle. Rocker arm oil supply structure includes rocker arm and roller subassembly. The one end of rocker arm is equipped with the installation groove, and the other end is equipped with the oil collecting groove for collecting oil. The outside wall of rocker arm is equipped with the oil storage chamber, and the inside wall of oil storage chamber is equipped with the first oil inlet hole for intercommunication oil collecting groove and the oil outlet hole for intercommunication installation groove. The roller subassembly is installed in the installation groove. When the engine in the application works, the oil collecting groove of rocker arm collects oil and other oil liquid in the cylinder head, and the oil liquid in the oil collecting groove flows into the oil storage chamber through the first oil inlet hole, and the oil liquid in the oil storage chamber flows to the installation groove through the oil outlet hole, so that the roller subassembly in the installation groove is fully supplied and lubricated, the roller subassembly can be effectively lubricated under high speed, the problem of roller subassembly wear is solved, the service life of the engine is prolonged, and the reliability of the motorcycle is improved.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a rocker arm fuel supply structure, an engine, and a motorcycle. Background Technology

[0002] An overhead camshaft (OHC) engine is an internal combustion engine design where the camshaft is mounted on the cylinder head. Compared to the traditional bottom-mounted camshaft (OHV) structure, it offers more efficient valve control. An OHC engine includes a cylinder head, within which are housed the camshaft, rollers, rocker arms, valves, and other valve train components. However, during engine operation, the high-speed rotation of the rollers can cause wear on the needle rollers and pins, resulting in a shortened engine lifespan. Utility Model Content

[0003] Therefore, it is necessary to provide a rocker arm oil supply structure, engine, and motorcycle to address the problem that the rollers are prone to wear and tear on the needle rollers and pins when they rotate at high speed during the use of existing overhead camshaft engines, which leads to a shortened engine life.

[0004] The technical solution is as follows:

[0005] Firstly, a rocker arm oil supply structure is provided, including:

[0006] A rocker arm, one end of which is provided with a mounting groove and the other end of which is provided with an oil collection groove for collecting oil. The outer side wall of the rocker arm is provided with an oil storage chamber, and the inner side wall of the oil storage chamber is provided with a first oil inlet hole for connecting to the oil collection groove and an oil outlet hole for connecting to the mounting groove.

[0007] The roller assembly is installed in the mounting slot.

[0008] The technical solution will be further explained below:

[0009] In one embodiment, the end of the rocker arm away from the roller assembly includes a first rib, a first valve pressure plate, and a second valve pressure plate. The first valve pressure plate and the second valve pressure plate are arranged along the rotation axis of the rocker arm and are both connected to the first rib to form the oil collection groove. The first oil inlet is provided on the first rib.

[0010] In one embodiment, the width of the bottom of the oil collection trough gradually decreases along the direction close to the first rib.

[0011] In one embodiment, the rocker arm further includes a mounting body with a first shaft hole, a second rib, a third rib, and a fourth rib. The third rib and the fourth rib are axially spaced on the outer side wall of the mounting body along the first shaft hole, and the first rib and the second rib are radially spaced on the outer side wall of the mounting body along the first shaft hole. The first rib and the second rib are both located between the third rib and the fourth rib, so that the first rib, the second rib, the third rib, the fourth rib, and the mounting body surround and form an oil storage chamber. The second rib is located on the side of the first rib away from the oil collection groove, and together with the third rib and the fourth rib, forms the mounting groove. The oil outlet is provided on the second rib.

[0012] In one embodiment, the mounting body is further provided with a second oil inlet hole that connects the oil collection groove and the first shaft hole.

[0013] In one embodiment, the third rib and the fourth rib, which are located away from the oil collection groove, are respectively provided with a second shaft hole and a third shaft hole. The roller assembly includes a roller pin, a needle roller bearing sleeved on the roller pin, and an outer wheel sleeved on the needle roller bearing. The two ends of the roller pin pass through the second shaft hole and the third shaft hole, respectively.

[0014] Secondly, a centrifugal pump and an engine are provided, including a cylinder head with an inner cavity, an overhead camshaft structure and a rocker arm oil supply structure, wherein the overhead camshaft structure and the rocker arm oil supply structure are both installed in the inner cavity, and the overhead camshaft structure is located on one side of the roller assembly and is used to push the roller assembly.

[0015] In one embodiment, the top camshaft structure includes a cam shaft and a push cam with a fourth shaft hole. The cam shaft passes through the fourth shaft hole and is installed on the inner wall of the inner cavity. The outer wall of the push cam is provided with an oil guide hole communicating with the fourth shaft hole.

[0016] In one embodiment, the engine is a horizontal engine.

[0017] On the other hand, a motorcycle is provided, including the aforementioned engine.

[0018] In the rocker arm oil supply structure, engine, and motorcycle described in the above embodiments, the engine operates to provide power to the motorcycle. The oil collection groove of the rocker arm collects engine oil and other fluids in the cylinder head. The oil in the oil collection groove flows into the oil storage chamber through the first oil inlet hole. The oil in the oil storage chamber then flows to the mounting groove through the oil outlet hole to fully lubricate the roller assembly in the mounting groove. This ensures that the roller assembly can be effectively lubricated at high speeds, solves the problem of roller assembly wear, extends the service life of the engine, and improves the reliability of the motorcycle. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a rocker arm oil supply structure according to one embodiment.

[0022] Figure 2 for Figure 1 Exploded view of the rocker arm oil supply structure.

[0023] Figure 3 for Figure 1 A cross-sectional view of the rocker arm oil supply structure.

[0024] Figure 4 This is a partial structural diagram of an engine according to one embodiment.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10. Rocker arm oil supply structure; 100. Rocker arm; 111. Mounting groove; 112. Oil collection groove; 113. Oil reservoir; 120. First rib; 121. First oil inlet; 130. First valve pressure plate; 140. Second valve pressure plate; 150. Mounting body; 151. First shaft hole; 152. Second oil inlet; 160. Second rib; 161. Oil outlet; 170. Third rib; 171. Second shaft hole; 180. Fourth rib; 181. Third shaft hole; 200. Roller assembly; 210. Roller pin; 220. Needle roller bearing; 230. Outer wheel; 20. Cylinder head; 21. Inner cavity; 30. Overhead camshaft structure; 31. Camshaft; 32. Push cam; 33. Fourth shaft hole; 34. Oil guide hole. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In response to the problem that high-speed rotation of the rollers during engine operation can easily lead to wear of the roller needles and pins, resulting in a shortened engine lifespan, the inventors discovered through research and testing that, due to the compact internal space and numerous parts of the cylinder head, the clearance between the rollers and the rocker arm is small, and there is no dedicated oil passage for effective lubrication of the rollers. The rollers rely solely on oil splashed from other parts for lubrication, and the oil does not easily enter the rollers. When the rollers rotate at high speed, the roller needles and pins are easily worn, which in turn leads to a shortened engine lifespan and reduced reliability.

[0029] Based on this, the rocker arm oil supply structure 10, engine and motorcycle of various embodiments of this application are designed to solve the above-mentioned technical problems.

[0030] like Figure 1 and Figure 2 As shown, in one embodiment, a rocker arm oil supply structure 10 is provided, including a rocker arm 100 and a roller assembly 200. One end of the rocker arm 100 is provided with a mounting groove 111, and the other end is provided with an oil collection groove 112 for collecting oil. The outer side wall of the rocker arm 100 is provided with an oil storage chamber 113, and the inner side wall of the oil storage chamber 113 is provided with a first oil inlet 121 for connecting to the oil collection groove 112, and an oil outlet 161 for connecting to the mounting groove 111. The roller assembly 200 is mounted in the mounting groove 111.

[0031] In the above embodiment, the rocker arm oil supply structure 10, when in use, the oil collection groove 112 of the rocker arm 100 collects oil and other fluids in the cylinder head 20. The oil in the oil collection groove 112 flows into the oil storage chamber 113 through the first oil inlet hole 121. The oil in the oil storage chamber 113 then flows to the mounting groove 111 through the oil outlet hole 161 to fully lubricate the roller assembly 200 in the mounting groove 111, ensuring that the roller assembly 200 can be effectively lubricated at high speeds, solving the problem of roller assembly 200 wear, extending the service life of the engine, and improving the reliability of the engine.

[0032] The roller assembly 200 can be configured as any of the existing roller structures for overhead camshaft engines.

[0033] Specifically, in this embodiment, the openings of the mounting groove 111 and the oil collecting groove 112 extend to the two end faces of the rocker arm 100, respectively. Along the direction perpendicular to the rotation axis of the rocker arm 100, the opposite sides of the mounting groove 111 and the opposite sides of the oil collecting groove 112 extend to the opposite two outer walls of the rocker arm 100.

[0034] like Figure 1 and Figure 2 As shown, further, the end of the rocker arm 100 away from the roller assembly 200 includes a first rib 120, a first valve pressure plate 130, and a second valve pressure plate 140. The first valve pressure plate 130 and the second valve pressure plate 140 are arranged along the rotation axis of the rocker arm 100 and are both connected to the first rib 120 to form an oil collection groove 112. A first oil inlet 121 is provided on the first rib 120. In this way, both the first valve pressure plate 130 and the second valve pressure plate 140 can transmit power to control the opening and closing of the valves, while also collecting oil and guiding the oil flow to the first oil inlet 121, improving the practicality of the rocker arm oil supply structure 10.

[0035] like Figure 2 As shown, optionally, the width of the bottom of the oil collecting trough 112 gradually decreases along the direction close to the first rib 120. In this way, the top width of the oil collecting trough 112 can be kept relatively large to ensure that the oil collecting trough 112 can effectively and reliably collect oil, while the bottom width of the oil collecting trough 112 gradually decreases to effectively guide the oil in the oil collecting trough 112 to the first oil inlet hole 121, thereby improving the reliability of the rocker arm oil supply structure 10.

[0036] The top width of the oil collection trough 112 can gradually increase in the direction away from the first rib 120, or it can remain unchanged. For example, the shape of the oil collection trough 112 can be U-shaped or V-shaped.

[0037] In this specific embodiment, the rotation axis of the rocker arm 100 is set to the left and right direction. The first valve pressure plate 130 and the second valve pressure plate 140 are bifurcated to the left and right. The overall shape of the rocker arm 100 is approximately Y-shaped.

[0038] like Figure 2 and Figure 3As shown, in one embodiment, the rocker arm 100 further includes a mounting body 150 with a first shaft hole 151, a second rib 160, a third rib 170, and a fourth rib 180. The third rib 170 and the fourth rib 180 are axially spaced on the outer wall of the mounting body 150 along the first shaft hole 151. The first rib 120 and the second rib 160 are radially spaced on the outer wall of the mounting body 150 along the first shaft hole 151. The first rib 120 and the second rib 160 are both located between the third rib 170 and the fourth rib 180, so that the first rib 120, the second rib 160, the third rib 170, the fourth rib 180, and the mounting body 150 enclose an oil storage chamber 113. The second rib 160 is located on the side of the first rib 120 away from the oil collection groove 112, and together with the third rib 170 and the fourth rib 180, they enclose a mounting groove 111. Oil outlet 161 is provided on the second rib 160.

[0039] The number and position of the first oil inlet hole 121 and the number and position of the oil outlet hole 161 can be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, there is one first oil inlet hole 121 and one oil outlet hole 161. The oil outlet hole 161 is used to supply oil to the roller assembly 200.

[0040] Specifically, in this embodiment, the first rib 120, the second rib 160, the third rib 170, the fourth rib 180, and the mounting body 150 are integrally formed. For example, the rocker arm 100 can be formed by injection molding, casting, or other methods.

[0041] Specifically, in this embodiment, the inner wall of the oil storage chamber 113 is inclined towards the interior of the oil storage chamber 113. As a result, the bottom space of the oil storage chamber 113 is reduced, and the amount of oil stored in it is also reduced, making it easier for the oil in the oil storage chamber 113 to flow to the mounting groove 111 through the oil outlet 161, thereby improving the reliability of the rocker arm oil supply structure 10.

[0042] like Figure 2 and Figure 3 As shown, optionally, the mounting body 150 is also provided with a second oil inlet 152 connecting the oil collection groove 112 and the first shaft hole 151. In this way, the oil in the oil collection groove 112 can flow into the first shaft hole 151 through the second oil inlet 152 to lubricate the inner wall of the first shaft hole 151, ensuring that the rocker arm 100 can rock smoothly while also preventing wear at the first shaft hole 151, thus improving the reliability of the rocker arm oil supply structure 10.

[0043] The number of second oil inlet holes 152 can be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, there is at least one second oil inlet hole 152. Each second oil inlet hole 152 extends radially along the first shaft hole 151. The second oil inlet holes 152 are spaced apart axially along the first shaft hole 151. In this way, the oil can be more evenly distributed in the first shaft hole 151, ensuring smooth rotation between the rocker arm 100 and the mounting shaft in which it is installed in the cylinder head 20, thus improving the reliability of the engine.

[0044] Specifically, in this embodiment, one end of the first valve pressure plate 130 is connected to both the mounting body 150 and the first rib 120. One end of the second valve pressure plate 140 is also connected to both the mounting body 150 and the first rib 120.

[0045] like Figure 2 and Figure 3 As shown, optionally, the end of the third rib 170 away from the oil collecting groove 112 and the end of the fourth rib 180 away from the oil collecting groove 112 are respectively provided with a second shaft hole 171 and a third shaft hole 181. The roller assembly 200 includes a roller pin 210, a needle roller bearing 220 sleeved on the roller pin 210, and an outer wheel 230 sleeved on the needle roller bearing 220. The two ends of the roller pin 210 pass through the second shaft hole 171 and the third shaft hole 181 respectively. In this way, the oil outlet 161 provides oil to the roller assembly 200, so that the oil can flow to the surface of the roller pin 210, the surface of the needle roller bearing 220, and the surface of the outer wheel 230, so as to fully lubricate the entire roller assembly 200 and effectively solve the problem of wear of the roller pin 210, the needle roller bearing 220, and the outer wheel 230.

[0046] like Figure 4 As shown, in one embodiment, an engine is provided, including a cylinder head 20 with an inner cavity 21, an overhead camshaft structure 30, and a rocker arm oil supply structure 10 as described in any of the above embodiments. Both the overhead camshaft structure 30 and the rocker arm oil supply structure 10 are mounted in the inner cavity 21. The overhead camshaft structure 30 is located on one side of the roller assembly 200 and is used to push the roller assembly 200. Thus, the overhead camshaft structure 30 can intermittently push the roller assembly 200, thereby driving the rocker arm 100 to rotate to actuate the valves, improving the engine's usability.

[0047] In this specific embodiment, the engine also includes a mounting shaft, which passes through the first shaft hole 151 and is mounted on the inner wall of the inner cavity 21.

[0048] like Figure 4As shown, optionally, the overhead camshaft structure 30 includes a camshaft 31 and a pusher cam 32 with a fourth shaft hole 33. The camshaft 31 passes through the fourth shaft hole 33 and is mounted on the inner wall of the inner cavity 21. The outer wall of the pusher cam 32 is provided with an oil guide hole 34 communicating with the fourth shaft hole 33. Thus, during the process of the pusher cam 32 pushing the roller assembly 200, the oil on the roller assembly 200 flows to the pusher cam 32 and flows through the oil guide hole 34 into the fourth shaft hole 33 to lubricate the inner wall of the fourth shaft hole 33 and the outer wall of the camshaft 31. This ensures that the pusher cam 32 can rotate smoothly while preventing wear on both the pusher cam 32 and the camshaft 31, thereby improving the reliability of the engine.

[0049] The number and arrangement of the oil guide holes 34 can be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, there is at least one oil guide hole 34. Each oil guide hole 34 extends radially along the fourth shaft hole 33. The oil guide holes 34 are spaced apart axially along the fourth shaft hole 33. This allows the oil to be more evenly distributed within the fourth shaft hole 33, ensuring lubrication at all contact points between the cam shaft 31 and the push cam 32, thus improving engine reliability.

[0050] Optionally, the inner diameter of the end of the oil guide hole 34 away from the fourth shaft hole 33 gradually increases along the direction close to the outer side wall of the push cam 32. In this way, the inner side wall of the end of the oil guide hole 34 away from the fourth shaft hole 33 can play a guiding role, effectively guiding the oil on the outer side wall of the push cam 32 into the oil guide hole 34, ensuring that the oil can remain in the fourth shaft hole 33 to lubricate the inner side wall of the fourth shaft hole 33 and the outer side wall of the cam shaft 31, thereby improving the reliability of the engine.

[0051] In this specific embodiment, the end of the oil guide hole 34 away from the fourth shaft hole 33 can be configured as a trumpet shape.

[0052] Specifically, in this embodiment, the engine is a horizontal engine. Thus, the rocker arm oil supply structure 10 is arranged vertically or inclined within the inner cavity 21 of the cylinder head 20. The oil collection groove 112, the first oil inlet 121, the oil reservoir 113, the oil outlet 161, and the mounting groove 111 can be arranged sequentially from top to bottom, ensuring that the oil collection groove 112 can flow through the first oil inlet 121, the oil reservoir 113, and the oil outlet 161 into the mounting groove 111, thereby reliably and accurately lubricating the roller assembly 200 and improving the engine's reliability.

[0053] In one embodiment, a motorcycle is also provided, including the engine of any of the above embodiments.

[0054] In the motorcycle described above, the engine operates to provide power to the motorcycle. The oil collection groove 112 of the rocker arm 100 collects engine oil and other fluids in the cylinder head 20. The oil in the oil collection groove 112 flows into the oil storage chamber 113 through the first oil inlet 121. The oil in the oil storage chamber 113 then flows into the mounting groove 111 through the oil outlet 161 to provide sufficient oil lubrication to the roller assembly 200 in the mounting groove 111. This ensures that the roller assembly 200 can be effectively lubricated at high speeds, solves the problem of roller assembly 200 wear, extends the service life of the engine, and improves the reliability of the motorcycle.

[0055] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0060] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rocker arm oil supply structure, characterized in that, include: A rocker arm, one end of which is provided with a mounting groove and the other end of which is provided with an oil collection groove for collecting oil. The outer side wall of the rocker arm is provided with an oil storage chamber, and the inner side wall of the oil storage chamber is provided with a first oil inlet hole for connecting to the oil collection groove and an oil outlet hole for connecting to the mounting groove. The roller assembly is installed in the mounting slot.

2. The rocker arm oil supply structure according to claim 1, characterized in that, The rocker arm at the end away from the roller assembly includes a first rib, a first valve pressure plate, and a second valve pressure plate. The first valve pressure plate and the second valve pressure plate are arranged along the rotation axis of the rocker arm and are both connected to the first rib to form the oil collection groove. The first oil inlet is provided on the first rib.

3. The rocker arm oil supply structure according to claim 2, characterized in that, The width of the bottom of the oil collection trough gradually decreases along the direction close to the first rib.

4. The rocker arm oil supply structure according to claim 2, characterized in that, The rocker arm further includes a mounting body with a first shaft hole, a second rib, a third rib, and a fourth rib. The third rib and the fourth rib are axially spaced on the outer side wall of the mounting body along the first shaft hole. The first rib and the second rib are radially spaced on the outer side wall of the mounting body along the first shaft hole. The first rib and the second rib are both located between the third rib and the fourth rib, so that the first rib, the second rib, the third rib, the fourth rib, and the mounting body surround and form an oil storage chamber. The second rib is located on the side of the first rib away from the oil collection groove, and together with the third rib and the fourth rib, forms the mounting groove. The oil outlet is provided on the second rib.

5. The rocker arm oil supply structure according to claim 4, characterized in that, The mounting body is also provided with a second oil inlet hole that connects the oil collection groove and the first shaft hole.

6. The rocker arm oil supply structure according to claim 4, characterized in that, The third rib and the fourth rib, which are located away from the oil collection groove, are respectively provided with a second shaft hole and a third shaft hole. The roller assembly includes a roller pin, a needle roller bearing sleeved on the roller pin, and an outer wheel sleeved on the needle roller bearing. The two ends of the roller pin pass through the second shaft hole and the third shaft hole, respectively.

7. An engine, characterized in that, The invention includes a cylinder head with an inner cavity, an overhead camshaft structure, and a rocker arm oil supply structure as described in any one of claims 1 to 6. The overhead camshaft structure and the rocker arm oil supply structure are both installed in the inner cavity. The overhead camshaft structure is located on one side of the roller assembly and is used to push the roller assembly.

8. The engine according to claim 7, characterized in that, The top-mounted camshaft structure includes a cam shaft and a push cam with a fourth shaft hole. The cam shaft passes through the fourth shaft hole and is installed on the inner wall of the inner cavity. The outer wall of the push cam is provided with an oil guide hole that communicates with the fourth shaft hole.

9. The engine according to claim 8, characterized in that, The engine is a horizontal engine.

10. A motorcycle, characterized in that, Includes the engine as described in any one of claims 7 to 9.

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