Cylinder heads, engines and motorcycles

Abstract

The present application relates to a cylinder head, an engine and a motorcycle. The cylinder head includes a cylinder block and a camshaft, and the cylinder block is provided with a bolt hole, a first oil circuit, a second oil circuit and a cam chamber. The bolt hole is used to insert the fixing bolts of the cylinder head to fix the cylinder head, and the bolt hole is used to connect to the lubricating oil pipeline of the engine. The first oil circuit connects the bolt hole with the cam chamber, and the second oil circuit is connected with the cam chamber. An oil outlet is formed at one end of the second oil circuit, and the oil outlet faces the exhaust valve of the cylinder head. Preferably, the oil outlet faces the oil seal of the exhaust valve. The camshaft is rotatably arranged in the cam chamber, and the camshaft is provided with a center hole and an oil outlet hole. The center hole passes through one end of the camshaft along the axial direction of the camshaft and is connected with the cam chamber. The oil outlet hole is formed on the circumferential surface of the camshaft and is connected with the center hole. The above-mentioned cylinder head increases the amount of lubricating oil on the exhaust valve, thereby improving the lubrication and cooling effect of the exhaust valve.

Description

Technical Field

[0001] The present application relates to the technical field of motorcycle accessories, and in particular to a cylinder head, an engine and a motorcycle. Background Art

[0002] With the development of transportation, motorcycles, as a convenient means of transportation, have become increasingly important in people's daily lives. The engine, the power source of a motorcycle, typically includes a cylinder head, which houses a rotatable camshaft, rocker arms that engage with the camshaft, and other moving parts, including intake and exhaust valves connected to the rocker arms. During operation, the rotation of the camshaft drives the rocker arms, which in turn opens or closes the intake and exhaust valves. During this process, high-speed relative motion occurs between the moving parts and between them and the cylinder head's cylinder block, causing friction on the surfaces of the moving parts, which in turn leads to wear and heat generation. To reduce wear, reduce frictional resistance, and extend service life, a lubrication system is typically required within the engine's cylinder head.

[0003] However, in the cylinder head, due to the spatial arrangement of the exhaust valves and other reasons, it is difficult for the general lubrication system to fully lubricate and cool the exhaust valves. Under the situation of increasingly stringent emission standards, the temperature of the exhaust duct also rises, resulting in worse operating conditions of the exhaust valves. Insufficient lubrication and cooling of the exhaust valves make it more likely for dry friction of the exhaust valves to occur, resulting in abnormal noise. Dry friction can easily lead to increased wear of the exhaust valves, which in turn causes the sound of the cylinder head to continue to deteriorate. Summary of the Invention

[0004] Based on this, it is necessary to provide a cylinder head, an engine and a motorcycle to solve the problem of how to more fully cool and lubricate the exhaust valve.

[0005] The present application provides a cylinder head, comprising:

[0006] a cylinder block, the cylinder block being provided with a bolt hole, a first oil passage, a cam chamber, and a second oil passage, the bolt hole being used for inserting a fixing bolt of the cylinder head and being connected to a lubricating oil pipeline of the engine, the first oil passage connecting the bolt hole and the cam chamber, the second oil passage communicating with the cam chamber, and an oil outlet being formed at one end of the second oil passage, the oil outlet facing an exhaust valve of the cylinder head;

[0007] A camshaft, wherein the camshaft is rotatably disposed in the cam cavity, and the camshaft is provided with a center hole and an oil outlet hole. The center hole passes through one end of the camshaft along the axial direction of the camshaft and is connected to the cam cavity. The oil outlet hole is provided on the circumferential surface of the camshaft and is connected to the center hole.

[0008] The technical solution is further described below:

[0009] In one embodiment, the height of the connection point between the first oil circuit and the bolt hole is greater than the height of the connection point between the first oil circuit and the cam cavity; and / or the height of the connection point between the second oil circuit and the cam cavity is greater than the height of the oil outlet.

[0010] In one embodiment, the diameter of the oil outlet is less than or equal to 1 mm.

[0011] In one embodiment, the second oil circuit includes a large diameter section and a small diameter section that are connected to each other, the inner diameter of the large diameter section is larger than the inner diameter of the small diameter section, the large diameter section is connected to the cam chamber, and the oil outlet is opened at one end of the small diameter section away from the large diameter section.

[0012] In one embodiment, one end of the first oil circuit is connected to the cam chamber, and the end of the first oil circuit away from the cam chamber penetrates the surface of the cylinder head and forms a first step hole, and a first oil plug is provided in the first step hole; and / or, the end of the second oil circuit away from the oil outlet penetrates the surface of the cylinder head and forms a second step hole, and a second oil plug is provided in the second step hole.

[0013] In one embodiment, the camshaft sleeve is provided with a bearing, and the bearing is sealed and connected to the cavity wall of the cam cavity to separate the cam cavity into an independent oil storage cavity and an installation cavity. The oil storage cavity is connected with the first oil circuit, the second oil circuit and the center hole. A cam portion is convexly provided on the outer peripheral surface of the camshaft, and the cam portion is used to contact and cooperate with the rocker arm of the cylinder head. The cam portion is located in the installation cavity.

[0014] In one embodiment, the oil outlet hole extends in a radial direction of the camshaft and passes through the cam portion.

[0015] In one embodiment, the number of the oil outlet holes is at least two, and all the oil outlet holes are arranged at intervals on the circumference of the camshaft.

[0016] The present application also provides an engine, comprising the above-mentioned cylinder head.

[0017] The present application also provides a motorcycle comprising the above-mentioned engine.

[0018] The above-mentioned cylinder head is configured such that a first oil circuit and a second oil circuit are opened in the cylinder body, and the first oil circuit connecting bolt hole is connected to the cam chamber, the second oil circuit is connected to the cam chamber, and an oil outlet facing the exhaust valve is formed at one end of the second oil circuit, so that the bolt hole on the cylinder body is connected to the lubricating oil pipeline of the engine, so that the lubricating oil output from the engine lubricating oil pipeline can enter the first oil circuit through the bolt hole, and the lubricating oil then enters the cam chamber through the first oil circuit, and then a part of the lubricating oil in the cam chamber enters the center hole of the camshaft. The lubricating oil entering the center hole is ejected from the oil outlet on the circumferential surface of the camshaft under the action of the centrifugal force generated when the camshaft rotates, so as to lubricate the moving parts in the cylinder head, reduce the wear of the moving parts, reduce the friction resistance, and extend the service life of the cylinder head. At the same time, another part of the lubricating oil in the cam chamber enters the second oil circuit. Since the oil outlet of the second oil circuit faces the exhaust valve, the lubricating oil entering the second oil circuit can be sprayed out from the oil outlet along the second oil circuit to be sprayed onto the exhaust valve, thereby increasing the amount of lubricating oil on the exhaust valve, forming a good oil film between the exhaust valve and the guide tube, reducing the dry friction between the exhaust valve and the guide tube, and improving the lubrication and cooling effects of the exhaust valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0022] Figure 1 A partial cross-sectional view of a cylinder head according to an embodiment.

[0023] Figure 2 for Figure 1 A partial cross-sectional view of the cylinder head shown in FIG. 1 is shown in FIG. 2 from another perspective.

[0024] Figure 3 for Figure 1 The cylinder head shown in FIG is a cross-sectional view taken along the AA section.

[0025] Description of Reference Numerals

[0026] 10. Cylinder block; 11. Bolt hole; 12. First oil circuit; 121. First oil plug; 13. Cam chamber; 131. Oil storage chamber; 132. Mounting chamber; 141. Air inlet; 142. Exhaust port; 15. Second oil circuit; 151. Large-diameter section; 152. Small-diameter section; 153. Oil outlet; 154. Second oil plug; 20. Camshaft; 21. Center hole; 22. Oil outlet; 23. First cam; 24. Second cam; 30. Bearing; 41. Intake valve; 42. Exhaust valve; 421. Conduit; 422. Oil seal; 51. First rocker arm; 52. Second rocker arm; 60. Fixing bolt. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0033] See also Figure 3As previously mentioned, a cylinder head generally includes a cylinder block 10, a camshaft 20 rotatably disposed within the cylinder block 10, an intake valve 41 for opening or closing an intake port 141, an exhaust valve 42 for opening or closing an exhaust port 142, a first rocker arm 51 connected to the intake valve 41, and a second rocker arm 52 connected to the exhaust valve 42. The first rocker arm 51 and the second rocker arm 52 respectively engage with different cam sections on the camshaft 20. During operation, the engine rotates the camshaft 20 via transmission components such as a chain. This rotation of the camshaft 20 drives the first rocker arm 51 and the second rocker arm 52 to swing, thereby driving the intake valve 41 and the exhaust valve 42 to alternately move, ultimately achieving alternating opening and closing of the intake valve 41 and the exhaust valve 42. During this process, friction occurs between the first rocker arm 51 and the camshaft 20, between the second rocker arm 52 and the camshaft 20, between the intake valve 41 and the cylinder block 10, between the exhaust valve 42 and the cylinder block 10, and between the valve springs on the intake valve 41 and the exhaust valve 42 and the cylinder block 10. This can easily cause wear, heat, or abnormal noise in these moving parts. To reduce wear, reduce frictional resistance, and extend service life, a lubrication system is generally required in the engine cylinder head.

[0034] In the related art, the lubrication system of the cylinder head is achieved by opening an oil plug channel on the cylinder body 10, introducing the lubricating oil into the cam chamber for installing the camshaft through the oil plug channel, and then the centrifugal force of the rotation of the camshaft 20 throws the lubricating oil out to lubricate the camshaft 20, the first rocker arm 51, the second rocker arm 52, the intake valve 41, the exhaust valve 42, the spring valve and other moving parts. However, the camshaft 20 is arranged between the intake valve 41 and the exhaust valve 42, and there is a certain distance between the camshaft 20 and the exhaust valve 42, resulting in only a small portion of the lubricating oil thrown out by the camshaft 20 falling on the exhaust valve 42. At the same time, since the exhaust valve 42 is arranged at an angle, the angle between the exhaust valve 42 and the horizontal plane is negative, that is, the height of the portion where the exhaust valve 42 and the conduit 421 cooperate is higher than the height of the oil seal 422 of the exhaust valve 42. After the lubricating oil drips onto the exhaust valve 42, it will flow directly downward under the action of gravity, and only a small amount of lubricating oil can enter the portion where the exhaust valve 42 and the conduit 421 cooperate, further causing dry friction between the exhaust valve 42 and the conduit 421, generating abnormal noise, and the dry friction between the exhaust valve 42 and the conduit 421 can easily lead to increased wear of the exhaust valve 42 and the conduit 421, thereby causing the sound of the cylinder head to continue to deteriorate.

[0035] Based on this, an embodiment of the present application provides a cylinder head, see Figure 1 as well as Figure 2A cylinder head according to one embodiment includes a cylinder block 10 and a camshaft 20. The cylinder block 10 is provided with a bolt hole 11, a first oil passage 12, a second oil passage 15, and a cam chamber 13. The bolt hole 11 is used to insert a cylinder head fixing bolt 60 to secure the cylinder head, and the bolt hole 11 is connected to the engine's lubricating oil line (not shown). The first oil passage 12 connects the bolt hole 11 with the cam chamber 13, and the second oil passage 15 connects to the cam chamber 13. An oil outlet 153 is formed at one end of the second oil passage 15. The oil outlet 153 faces the exhaust valve 42 of the cylinder head. Preferably, the oil outlet 153 faces the oil seal 422 of the exhaust valve 42. The camshaft 20 is rotatably disposed in the cam chamber 13. The camshaft 20 is provided with a center hole 21 and an oil outlet hole 22. The center hole 21 passes through one end of the camshaft 20 along the axial direction of the camshaft 20 and is connected to the cam chamber 13. The oil outlet hole 22 is provided on the circumferential surface of the camshaft 20 and is connected to the center hole 21.

[0036] During operation, the engine pumps lubricating oil into bolt hole 11 through the lubricating oil pipeline. The lubricating oil then flows through first oil passage 12 into cam chamber 13. A portion of the lubricating oil in cam chamber 13 then flows through center hole 21 into camshaft 20. Under the centrifugal force generated by the rotation of camshaft 20, it is ejected from oil outlet holes 22 on the circumference of camshaft 20, thereby lubricating moving parts such as camshaft 20, first rocker arm 51, second rocker arm 52, intake valve 41, exhaust valve 42, and spring valve. Simultaneously, another portion of the lubricating oil in cam chamber 13 enters second oil passage 15 and is ejected from oil outlet 153 along this second oil passage 15, spraying onto oil seal 422 of exhaust valve 42. This increases the amount of lubricating oil on exhaust valve 42 and improves lubrication of exhaust valve 42.

[0037] The above-mentioned cylinder head is configured such that a first oil passage 12 and a second oil passage 15 are opened in the cylinder block 10, and the first oil passage 12 is connected to the cam chamber 13 through the bolt hole 11, and the second oil passage 15 is connected to the cam chamber 13, and an oil outlet 153 is formed at one end of the second oil passage 15 toward the exhaust valve 42, so that the bolt hole 11 on the cylinder block 10 is connected to the lubricating oil pipeline of the engine, so that the lubricating oil output from the engine lubricating oil pipeline can enter the first oil passage 12 through the bolt hole 11, and the lubricating oil then enters the cam chamber 13 through the first oil passage 12, and then a part of the lubricating oil in the cam chamber 13 enters the center hole 21 of the camshaft 20, and the lubricating oil entering the center hole 21 is ejected from the oil outlet 22 on the peripheral surface of the camshaft 20 under the action of the centrifugal force generated when the camshaft 20 rotates, so as to lubricate the various moving parts in the cylinder head, reduce the wear of the moving parts, reduce the friction resistance, and extend the service life of the cylinder head. At the same time, another portion of the lubricating oil in the cam chamber 13 enters the second oil passage 15. Since the oil outlet 153 of the second oil passage 15 faces the exhaust valve 42, the lubricating oil entering the second oil passage 15 can be sprayed out from the oil outlet 153 along the second oil passage 15 to be sprayed onto the exhaust valve 42, thereby increasing the amount of lubricating oil on the exhaust valve 42, forming a good oil film between the exhaust valve 42 and the conduit 421, reducing dry friction between the exhaust valve 42 and the conduit 421, and improving the lubrication and cooling effects of the exhaust valve 42.

[0038] See also Figure 1 Alternatively, in one embodiment, the second oil passage 15 is arranged at an angle, and the angle between the second oil passage 15 and the horizontal line is negative, so that the height of the connection point between the second oil passage 15 and the cam chamber 13 is greater than the height of the oil outlet 153. In this way, when the engine speed is low and the lubricating oil pressure is low, the lubricating oil in the cam chamber 13 can still flow into the second oil passage 15 under the action of gravity and drip from the oil outlet 153 along the second oil passage 15 onto the exhaust valve 42. At high engine speeds, the lubricating oil in the cam chamber 13 can be pumped into the second oil passage 15 under high oil pressure and sprayed from the oil outlet 153 along the second oil passage 15 onto the exhaust valve 42, thereby enhancing the lubrication between the exhaust valve 42 and the conduit 421. The lubricating oil also reduces the temperature at the exhaust valve 42, improves the friction between the exhaust valve 42 and the conduit 421, and resolves the abnormal sound problem.

[0039] Similarly, the height of the connection between the first oil passage 12 and the bolt hole 11 is greater than the height of the connection between the first oil passage 12 and the cam chamber 13. Specifically, the engine's lubricating oil pipeline delivers lubricating oil downward and upward to the bolt hole 11. By connecting the higher end of the first oil passage 12 to the bolt hole 11 and the lower end of the first oil passage 12 to the cam chamber 13, even when the engine speed is low and the lubricating oil pressure is low, the lubricating oil in the bolt hole 11 can still flow from the first oil passage 12 to the cam chamber 13 under the action of gravity.

[0040] Continue to see Figure 1 The second oil passage 15 includes a large-diameter section 151 and a small-diameter section 152 that are interconnected. The inner diameter of the large-diameter section 151 is larger than that of the small-diameter section 152. The large-diameter section 151 is connected to the cam chamber 13, and an oil outlet 153 is located at the end of the small-diameter section 152 facing away from the large-diameter section 151. By connecting the large-diameter section 151 to the cam chamber 13, some of the lubricating oil in the cam chamber 13 can flow more easily into the second oil passage 15. The small-diameter section 152 can also reduce the space occupied by the small-diameter section 152 to match the size between the camshaft 20 and the exhaust valve 42.

[0041] Preferably, in one embodiment, the diameter of the oil outlet 153 is less than or equal to 1 mm. If the diameter of the oil outlet 153 is too large, most of the lubricating oil in the cam chamber 13 will flow into the second oil passage 15, reducing the amount of lubricating oil entering the center hole 21. This, in turn, will result in insufficient lubrication of the camshaft 20 and moving parts such as the swing arm that contacts the camshaft 20. Furthermore, an overly large diameter of the oil outlet 153 will result in lubricating oil waste. Therefore, by configuring the diameter of the oil outlet 153 to be less than or equal to 1 mm, it is possible to increase the amount of lubricating oil flowing into the exhaust valve 42 while avoiding the problem of lubricating oil waste caused by excessive lubricating oil being discharged from the oil outlet 153 and insufficient lubricating oil entering the center hole 21.

[0042] Continue to see Figure 1 as well as Figure 2 Optionally, in one embodiment, one end of the first oil passage 12 is connected to the cam chamber 13, and the end of the first oil passage 12 facing away from the cam chamber 13 penetrates the surface of the cylinder head. In this manner, the first oil passage 12 can be formed by drilling directly into the surface of the cylinder head, simplifying the manufacturing process. Furthermore, a first stepped hole is formed at the end of the first oil passage 12 that penetrates the surface of the cylinder head. A first oil plug 121 is disposed within the first stepped hole. The first oil plug 121 is used to seal the end of the first oil passage 12 facing away from the cam chamber 13, thereby preventing lubricating oil from leaking from this end of the first oil passage 12.

[0043] Similarly, in one embodiment, the end of the second oil passage 15 facing away from the oil outlet extends through the surface of the cylinder head. This allows the second oil passage 15 to be formed directly by drilling a hole in the cylinder head, simplifying the manufacturing process. Furthermore, a second stepped hole is formed at the end of the second oil passage 15 facing away from the oil outlet 153. A second oil plug 154 is disposed within the second stepped hole. This second oil plug 154 is used to seal the end of the second oil passage 15 facing away from the oil outlet 153, preventing lubricating oil from leaking from this end.

[0044] See also Figure 1Optionally, in one embodiment, the camshaft 20 is sleeved with a bearing 30, and the bearing 30 is sealedly connected to the wall of the cam chamber 13, so that the camshaft 20 can be rotatably set in the cam chamber 13. Furthermore, the bearing 30 separates the cam chamber 13 into an independent oil storage chamber 131 and a mounting chamber 132. The first oil circuit 12 and the second oil circuit 15 are both connected to the oil storage chamber 131, and the end of the camshaft 20 passed through by the center hole 21 passes through the bearing 30 and extends into the oil storage chamber 131, so that the oil storage chamber 131 is connected to the center hole 21. A cam portion is convexly provided on the outer peripheral surface of the camshaft 20, and the cam portion is used to contact and cooperate with the rocker arm (including the first rocker arm 51 and the second rocker arm 52) of the cylinder head. The cam portion is located in the mounting chamber 132.

[0045] In this way, the bearing 30 separates the cam chamber 13 into an independent oil reservoir 131 and mounting chamber 132. The first oil passage 12, the second oil passage 15, and the center hole 21 are all connected to the oil reservoir 131. Thus, the bearing 30 can seal the lubricating oil output from the first oil passage 12 within the oil reservoir 131, preventing lubricating oil leakage and contamination. At the same time, some of the lubricating oil in the oil reservoir 131 can be discharged through the center hole 21 and the oil outlet 22 to the mounting chamber 132 to lubricate moving parts such as the cam portion, the first rocker arm 51, the second rocker arm 52, the intake valve 41, and the exhaust valve 42. Another portion of the lubricating oil in the oil reservoir 131 can be discharged through the second oil passage 15 to the exhaust valve 42 to lubricate the exhaust valve 42.

[0046] Furthermore, the oil outlet hole 22 extends radially along the camshaft 20 and penetrates the cam portion. Specifically, because the centrifugal force generated by the rotation of the camshaft 20 is directed radially, extending the oil outlet hole 22 radially along the camshaft 20 allows the lubricating oil within the center hole 21 to be more smoothly ejected from the oil outlet hole 22. Furthermore, because the contact area between the camshaft 20 and the rocker arms (including the first rocker arm 51 and the second rocker arm 52) is the cam portion, friction primarily occurs in the cam portion. Therefore, by having the oil outlet hole 22 penetrate the cam portion, the lubricating oil ejected from the oil outlet hole 22 is directly sprayed onto the cam portion and rocker arm, thereby improving the lubrication and cooling effects of the cam portion and rocker arm.

[0047] Furthermore, the number of the oil outlet holes 22 is at least two, and all the oil outlet holes 22 are arranged at intervals on the circumference of the camshaft 20. Figure 1In this embodiment, the cam portion includes a first cam 23 and a second cam 24, which are axially spaced apart and arranged on the camshaft 20. The first cam 23 is configured to contact and mate with the first rocker arm 51, while the second cam 24 is configured to contact and mate with the second rocker arm 52. Accordingly, two oil outlet holes 22 are provided: one oil outlet hole 22 is provided in the first cam 23, and the other oil outlet hole 22 is provided in the second cam 24. These two oil outlet holes 22 can respectively lubricate and cool the first and second cams 23, 24, and the corresponding first and second rocker arms 51, 52, further enhancing lubrication and cooling performance.

[0048] One embodiment of the present application further provides an engine, comprising the cylinder head of any of the above embodiments. Furthermore, the engine of one embodiment further comprises an oil tank, an oil pump, and a lubricating oil pipeline, wherein the oil tank is configured to store lubricating oil, the lubricating oil pipeline communicates with the oil tank and bolt hole 11, and the oil pump is connected to the lubricating oil pipeline and configured to pump lubricating oil from the oil tank into the lubricating oil pipeline and then into the bolt hole 11 through the lubricating oil pipeline.

[0049] Furthermore, an embodiment of the present application also provides a motorcycle, and the motorcycle of one embodiment includes the engine of any of the above embodiments.

[0050] The above-mentioned engine and motorcycle are configured such that a first oil passage 12 and a second oil passage 15 are opened in the cylinder block 10 of the cylinder head, and the first oil passage 12 is connected to the cam chamber 13 via the bolt hole 11, and the second oil passage 15 is connected to the cam chamber 13, and an oil outlet 153 is formed at one end of the second oil passage 15 facing the exhaust valve 42, so that the bolt hole 11 on the cylinder block 10 is connected to the lubricating oil pipeline of the engine, so that the lubricating oil output from the lubricating oil pipeline of the engine can enter the first oil passage 12 through the bolt hole 11, and the lubricating oil then enters the cam chamber 13 through the first oil passage 12, and then a part of the lubricating oil in the cam chamber 13 enters the center hole 21 of the camshaft 20, and the lubricating oil entering the center hole 21 is ejected from the oil outlet 22 on the peripheral surface of the camshaft 20 under the action of the centrifugal force generated when the camshaft 20 rotates, so as to lubricate the moving parts in the cylinder head, reduce the wear of the moving parts, reduce the friction resistance, and extend the service life of the cylinder head. At the same time, another portion of the lubricating oil in the cam chamber 13 enters the second oil passage 15. Since the oil outlet 153 of the second oil passage 15 faces the exhaust valve 42, the lubricating oil entering the second oil passage 15 can be sprayed out from the oil outlet 153 along the second oil passage 15 to be sprayed onto the exhaust valve 42, thereby increasing the amount of lubricating oil on the exhaust valve 42, forming a good oil film between the exhaust valve 42 and the conduit 421, reducing dry friction between the exhaust valve 42 and the conduit 421, and improving the lubrication and cooling effects of the exhaust valve 42.

[0051] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0052] The above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A cylinder head, characterized in that: include: a cylinder block, the cylinder block being provided with a bolt hole, a first oil passage, a cam chamber, and a second oil passage, the bolt hole being used for inserting a fixing bolt of the cylinder head and being connected to a lubricating oil pipeline of the engine, the first oil passage connecting the bolt hole and the cam chamber, the second oil passage communicating with the cam chamber, and an oil outlet being formed at one end of the second oil passage, the oil outlet facing an exhaust valve of the cylinder head; a camshaft, the camshaft being rotatably disposed in the cam cavity, the camshaft being provided with a center hole and an oil outlet hole, the center hole penetrating one end of the camshaft in an axial direction thereof and being in communication with the cam cavity, the oil outlet hole being provided on a circumferential surface of the camshaft and being in communication with the center hole; The camshaft sleeve is provided with a bearing, and the bearing is sealedly connected to the cavity wall of the cam cavity to separate the cam cavity into an independent oil storage cavity and a mounting cavity. The oil storage cavity is connected to the first oil passage, the second oil passage and the center hole. A cam portion is convexly provided on the outer peripheral surface of the camshaft, and the cam portion is used to contact and cooperate with the rocker arm of the cylinder head. The cam portion is located in the mounting cavity. The first oil circuit and the second oil circuit are formed by directly drilling holes on the surface of the cylinder head. The first oil circuit and the second oil circuit are both arranged in a straight line. The first oil circuit, the second oil circuit and the cam chamber directly intersect in the oil storage chamber.

2. The cylinder head according to claim 1, characterized in that The height of the connection point between the first oil circuit and the bolt hole is greater than the height of the connection point between the first oil circuit and the cam cavity; and / or the height of the connection point between the second oil circuit and the cam cavity is greater than the height of the oil outlet.

3. The cylinder head according to claim 1, characterized in that The diameter of the oil outlet is less than or equal to 1 mm.

4. The cylinder head according to claim 1, characterized in that The second oil circuit includes a large diameter section and a small diameter section connected to each other. The inner diameter of the large diameter section is larger than the inner diameter of the small diameter section. The large diameter section is connected to the cam chamber. The oil outlet is opened at one end of the small diameter section away from the large diameter section.

5. The cylinder head according to claim 1, characterized in that One end of the first oil circuit is connected to the cam chamber, and the end of the first oil circuit away from the cam chamber penetrates the surface of the cylinder head and forms a first step hole, and a first oil plug is provided in the first step hole; and / or, the end of the second oil circuit away from the oil outlet penetrates the surface of the cylinder head and forms a second step hole, and a second oil plug is provided in the second step hole.

6. The cylinder head according to claim 1, characterized in that The oil outlet hole extends in a radial direction of the camshaft and penetrates the cam portion.

7. The cylinder head according to claim 1, characterized in that The number of the oil outlet holes is at least two, and all the oil outlet holes are arranged at intervals on the circumferential surface of the camshaft.

8. An engine, characterized in that: The invention comprises the cylinder head according to any one of claims 1 to 7.

9. A motorcycle, characterized in that: Including the engine described in claim 8.

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