Engine and motorcycle using the same

Abstract

The application discloses an engine and a motorcycle adopting the engine. The engine comprises a shell and a crankshaft. The shell comprises a crankcase and a cylinder head. The crankshaft is located in the crankcase and rotationally connected with the crankcase. The cylinder head is provided with a containing cavity and an oil return hole. The upper hole of the oil return hole is communicated with the bottom of the containing cavity. The oil return hole is used for delivering lubricating oil to the crankcase. When the motorcycle is in a parking state, the height of one side of the cylinder head along the width direction of the frame is lower than the height of the other side. The side with the lower height of the cylinder head is defined as an inclined side. The oil return hole is located at the position of the cylinder head closest to the inclined side. Through the above arrangement, the service life of the lubricating oil of the engine can be improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an engine and a motorcycle using the engine. Background Technology

[0002] Motorcycles are vehicles that are steered by using handlebars to turn the front wheel. They are lightweight, agile, and fast, and are widely used in patrol, passenger and freight transportation, and other fields.

[0003] A motorcycle typically consists of a frame, body panels, a running gear, a suspension system, a seat, an electrical system, and an engine. The engine includes a cylinder head, which usually contains lubricating oil used to lubricate components such as the crankshaft. This lubricating oil circulates back to the oil pan. If the lubricating oil in the cylinder head cannot completely return to the oil pan, excessive lubricating oil will remain in the cylinder head. This residual lubricating oil will precipitate and oxidize, reducing the lifespan of the engine's lubricating oil. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this application is to provide an engine and a motorcycle using the engine, wherein the lubricating oil in the engine has a long service life.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] An engine includes a housing and a crankshaft. The housing includes a crankcase and a cylinder head, and the crankshaft is located within the crankcase and rotatably connected to the crankcase. The cylinder head has a receiving cavity and an oil return hole, the upper opening of which communicates with the bottom of the receiving cavity. The oil return hole is used to deliver lubricating oil to the crankcase. When the motorcycle is parked, the cylinder head is lower on one side along the width direction of the motorcycle frame than on the other side; the side with the lower cylinder head height is defined as the tilt side, and the oil return hole is located on the cylinder head closest to the tilt side.

[0007] Furthermore, a preset straight line is defined, the cylinder head extends substantially along the preset straight line, the bottom of the receiving cavity forms an upwardly protruding structure, the protruding structure extends substantially along the preset straight line; the cylinder head has an intake passage and an exhaust passage, which are distributed on both sides of the protruding structure along a direction perpendicular to the preset straight line, and the oil return hole is located on at least one side of the protruding structure along a direction perpendicular to the preset straight line.

[0008] Furthermore, the bottom of the receiving cavity is provided with two flow surfaces, which are located on both sides of the protruding structure, and the oil return hole is located on the flow surface; the flow surface is curved, and the side of the flow surface near the protruding structure is higher than the side of the flow surface near the oil return hole.

[0009] Furthermore, there are two oil return holes, which are distributed on both sides of the raised structure.

[0010] Furthermore, a cylinder head water jacket is provided inside the cylinder head, with the outlet of the cylinder head water jacket located on the inclined side. The protruding structure at least partially surrounds the outlet of the cylinder head water jacket and protrudes upward, so that the distance between the inner wall of the outlet and the surface of the receiving cavity is basically the same.

[0011] Furthermore, the engine includes a timing mechanism that is connected to the crankshaft drive; the cylinder head includes a timing chamber, in which the timing mechanism is at least partially located, and the timing chamber is located on the side of the cylinder head away from the tilt side.

[0012] Furthermore, the engine also includes an ignition mechanism, and the cylinder head includes an ignition hole for accommodating the ignition mechanism; viewed axially from the ignition hole, the cylinder head is basically a quadrilateral structure, and the areas where the two vertices near the inclined side of the cavity are defined as two inclined regions, and the oil return hole is located at at least one inclined region of the cylinder head.

[0013] Furthermore, the cylinder head is formed with a connecting boss for bolts to pass through and a connecting hole that passes through the connecting boss and the cylinder head. When the motorcycle is in a parked state, the highest point of the connecting boss is higher than the highest point of the oil return hole.

[0014] Furthermore, there are two connecting bosses, which are distributed on both sides of the raised structure, and at least one oil return hole is located between the connecting bosses and the raised structure.

[0015] Furthermore, the oil return holes are adjacent to the outer wall of the connecting boss and the inner wall of the receiving cavity, and the outer wall of the connecting boss and the inner wall of the receiving cavity form a protective wall for protecting the oil return holes.

[0016] To achieve the above objectives, this application also adopts the following technical solution:

[0017] A motorcycle includes a frame, a body panel, a running gear, and an engine as described in any of the above embodiments, wherein the body panel at least partially covers the frame; the running gear is at least partially located below the frame; and the engine is supported by the frame and drivenly connected to the running gear.

[0018] In this application, by opening an oil return hole on the inclined side, the lubricating oil gathered on the inclined side can be concentrated and flowed to the oil pan, thereby avoiding the residual lubricating oil in the cylinder head, which in turn helps to improve the service life of the engine lubricating oil. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a motorcycle provided in an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the overall structure of a motorcycle engine provided in an embodiment of this application.

[0021] Figure 3 This is an exploded schematic diagram of a motorcycle engine provided in an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the structure of a motorcycle cylinder head provided in an embodiment of this application.

[0023] Figure 5 This is a cross-sectional schematic diagram of a motorcycle cylinder head provided in an embodiment of this application. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, this application provides a motorcycle 100, which includes a frame 11, a body panel 12, a running system 13, a suspension system 14, a seat 15, an electrical system 16, a transmission system (not shown) and an engine 200.

[0026] For ease of description, this application defines the directions of front, back, left, right, up, and down. The front-back direction refers to the length direction of the motorcycle frame 11, the left-right direction refers to the width direction of the motorcycle frame 11, and the up-down direction refers to the height direction of the motorcycle frame 11. In this embodiment, the directions of front, back, left, right, up, and down are based on the motorcycle 100 traveling on a level road surface, not on a sloping road surface.

[0027] The frame 11 serves as the basic framework of the motorcycle 100, supporting the body panel 12, running system 13, suspension system 14, seat 15, electrical system 16, transmission system, and engine 200. The body panel 12 is at least partially located on and connected to the frame 11, protecting the internal components of the motorcycle 100. The running system 13 is at least partially located below the frame 11, and the suspension system 14 connects the running system 13 to the frame 11. The engine 200 is supported by the frame 11. The electrical system 16 is supported by the frame 11 and is at least partially mounted on the body panel 12 or the frame 11. The electrical system 16 is used to display the motorcycle 100's driving data and control the motorcycle 100's operation. The seat 15 is supported by the frame 11 and is used to support the driver and / or passenger. The transmission system is used to transmit power from the engine 200. The transmission system includes a gear shift mechanism, which is supported by the frame 11 and connects the engine 200 to the running system 13.

[0028] like Figure 3 As shown, the engine 200 includes a housing 21, a crankshaft 22, an intake mechanism 23, an ignition mechanism (not shown), a timing mechanism 25, and a piston mechanism 26. The housing 21 serves as the basic frame of the engine 200, supporting the crankshaft 22, intake mechanism 23, ignition mechanism, timing mechanism 25, and piston mechanism 26. Specifically, the housing 21 includes a cylinder head cover 211, a cylinder head 212, a cylinder block 213, a crankcase 214, and an oil pan 215, which are connected sequentially. The cylinder head 212 and cylinder block 213 are connected to form a combustion chamber. The intake mechanism 23 is connected to the cylinder head 212 and supplies air to the combustion chamber to mix air and fuel to form an air-fuel mixture. The ignition mechanism is at least partially located within the combustion chamber and is used to ignite the air-fuel mixture. A piston mechanism 26 is at least partially located within the cylinder block 213. The piston mechanism 26 converts the thermal energy generated by the combustion of the air-fuel mixture into mechanical energy. Specifically, the piston mechanism 26 includes a piston that converts thermal energy into reciprocating mechanical energy. A crankshaft 22 is at least partially located within the crankcase 214 and is rotatably connected to the crankcase 214. The crankshaft 22 converts the reciprocating motion of the piston into rotational motion and is drively connected to a transmission mechanism. A timing mechanism 25 is at least partially located within the cylinder head 212 and is drively connected to the crankshaft 22. The timing mechanism 25 controls the intake and exhaust of the engine 200.

[0029] like Figure 4 and Figure 5As shown, in one embodiment, the cylinder head 212 has a receiving cavity 2120 and an oil return hole 212a, the upper opening of which is connected to the bottom of the receiving cavity 2120. The receiving cavity 2120 is used to receive lubricating oil. The oil return hole 212a is used to transport the lubricating oil to the crankcase 214, and then through the crankcase 214 to the oil pan 215 (see reference). Figure 3 Specifically, when the motorcycle 100 is in a parked state, the height of one side of the cylinder head 212 along the width direction of the frame 11 is lower than the height of the other side. The side of the cylinder head 212 with the lower height is defined as the tilt side 212k, and the oil return hole 212a is located on the cylinder head 212 closest to the tilt side 212k. With this configuration, when parked, the lubricating oil in the cylinder head 212 will flow towards the tilt side 212k, so that the lubricating fluid in the cylinder head 212 will be concentrated on the tilt side 212k. By placing the oil return hole 212a on the tilt side 212k, the lubricating oil concentrated on the tilt side 212k can be delivered to the crankcase 214, thereby avoiding the precipitation and oxidation of residual lubricating oil in the cylinder head 212, which is beneficial to improving the service life of the lubricating fluid in the engine 200.

[0030] It should be noted that the frame 11 includes the kickstand 111 (see reference). Figure 1 The kickstand 111 is used to support the motorcycle 100. The parking state of the motorcycle 100 refers to the state in which the motorcycle 100 is parked using the kickstand 111. Furthermore, when the motorcycle 100 is in the parking state, the oil return hole 212a is at the lowest point of the cylinder head 212, allowing lubricating oil in the cylinder head 212 to be delivered to the crankcase 214 through the oil return hole 212a. However, when the motorcycle 100 is in the driving state, the oil return hole 212a may not be at the lowest point of the cylinder head 212.

[0031] In one implementation, a predetermined straight line 10a is defined, and the cylinder head 212 extends substantially along the predetermined straight line 10a. The predetermined straight line 10a is substantially parallel to the axis of the crankshaft 22. Specifically, the bottom of the receiving cavity 2120 has an upwardly protruding protrusion 212b, which extends substantially along the predetermined straight line 10a. More specifically, the cylinder head 212 has an intake passage 2124 and an exhaust passage 212c. Along a direction perpendicular to the predetermined straight line 10a, the intake passage 2124 and the exhaust passage 212c are distributed on both sides of the protrusion 212b, and the oil return hole 212a is located on at least one side of the protrusion 212b along the direction perpendicular to the predetermined straight line 10a. With this configuration, the raised structure 212b can create a slope within the cylinder head 212 that facilitates fluid flow, thereby allowing the lubricant within the cylinder head 212 to flow in a concentrated manner to the return oil hole 212a, which in turn can further improve the return flow rate of the lubricant within the cylinder head 212.

[0032] As an optional implementation, the bottom of the receiving cavity 2120 is provided with two flow surfaces 212f, located on both sides of the protruding structure 212b. The oil return hole 212a is located on the flow surface 212f, meaning the bottom of the oil groove 212m is the flow surface 212f. Specifically, the flow surface 212f is curved. More specifically, the side of the flow surface 212f near the protruding structure 212b is higher than the side of the flow surface 212f near the oil return hole 212a. This arrangement allows the lubricating oil flowing on the flow surface 212f to be guided to the oil return hole 212a, thereby improving the return rate of lubricating oil in the cylinder head 212.

[0033] It should be noted that the flow surface 212f can also be an inclined surface. Therefore, the flow surface 212f only needs to satisfy that the side near the protrusion 212b is higher than the side near the return oil hole 212a, and that no lubricating oil remains on the flow surface 212f. Therefore, this application does not limit the shape of the flow surface 212f.

[0034] In one implementation, two oil return holes 212a are provided, distributed on both sides of the raised structure 212b. This arrangement allows the two oil return holes 212a to increase the return rate of lubricating oil within the cylinder head 212, thereby improving the service life of the lubricating oil.

[0035] In one embodiment, a cylinder head water jacket (not shown) is provided inside the cylinder head 212, with the outlet of the cylinder head water jacket located on the inclined side 212k. Specifically, the protruding structure 212b at least partially surrounds the outlet of the cylinder head water jacket and protrudes upward, so that the distance between the inner wall of the outlet and the surface of the receiving cavity 2120 is substantially the same. In this application, the outlet of the cylinder head water jacket inside the cylinder head 212 extends substantially along a predetermined straight line 10a. Therefore, by providing the upwardly protruding structure 212b, the cylinder head water jacket can be avoided. At the same time, the protruding structure 212b also helps to improve the return rate of lubricating oil inside the cylinder head 212, thereby allowing the lubricating oil inside the cylinder head 212 to flow to the oil return hole 212a through the existing protruding structure 212b.

[0036] In one embodiment, the cylinder head 212 includes a timing chamber 2121, within which the timing mechanism 25 is at least partially located. Specifically, the timing chamber 2121 is located on the side of the cylinder head 212 away from the inclined side 212k. This arrangement avoids interference between the pipeline connected to the oil return port 212a and the timing chamber 2121, thereby improving the space utilization of the cylinder head 212.

[0037] In one embodiment, the engine 200 also includes an ignition mechanism (not shown) for igniting the air-fuel mixture in the cylinder block 213. Specifically, the cylinder head 212 includes an ignition hole 212d for accommodating the ignition mechanism. Viewed axially from the ignition hole 212d, the cylinder head 212 is essentially quadrilateral. The regions within the accommodating cavity 2120 near the two vertices of the inclined side 212k are defined as two inclined regions 212n. An oil return hole 212a is located in at least one inclined region 212n of the cylinder head 212. In this application, there are two oil return holes 212a, each located within one of the two inclined regions 212n, allowing oil to return through the holes 212a in both inclined regions 212n, thereby improving the return rate of lubricating oil within the cylinder head 212.

[0038] As an optional implementation, the cylinder head 212 has a connecting boss 212e and a connecting hole 212g for bolts to pass through, the connecting hole 212g penetrating the connecting boss 212e and the cylinder head 212. The connecting hole 212g is used to pass a fastener (not shown) for connecting the cylinder head 212 to the cylinder block 213. In some embodiments, the fastener can be a bolt. Specifically, when the motorcycle 100 is in a parked state, the highest point of the connecting boss 212e is higher than the highest point of the oil return hole 212a. This arrangement prevents lubricating oil on the inclined side 212k from leaking from the connecting hole 212g, thereby improving the return rate of lubricating oil in the cylinder head 212. More specifically, the connecting boss 212e is closer to the apex of the inclined side 212k than the oil return hole 212a, that is, the connecting boss 212e is closer to the apex of the bottom of the oil groove 212m on the inclined side 212k than the oil return hole 212a. This design allows the fastener located at the connecting boss 212e to be closer to the vertices of the quadrilateral structure, thereby reducing the distance between the fastener and the sidewall of the cylinder head 212. This, in turn, improves the fastener's locking force on the cylinder head 212 when assembling the cylinder head 212 and cylinder block 213, thus enhancing the connection stability between the cylinder head 212 and cylinder block 213. Furthermore, having the highest point of the connecting boss 212e higher than the highest point of the oil return hole 212a prevents the fastener from being immersed in lubricating oil, which could affect its tightness.

[0039] As an optional implementation, two connecting bosses 212e are provided. Specifically, the two connecting bosses 212e are distributed on both sides of the raised structure 212b, and at least one oil return hole 212a is located between the connecting bosses 212e and the raised structure 212b.

[0040] In one embodiment, the oil return hole 212a is provided through the cylinder head 212. In some embodiments, an oil supply hole (not shown) communicating with the oil return hole 212a is provided in the crankcase 214. This oil supply hole is connected to the oil pan 215, so that the lubricating oil in the cylinder head 212 can pass through the cylinder head 212 through the oil return hole 212a and be transported to the oil pan 215 through the oil supply hole in the crankcase 214, thereby realizing the return flow of lubricating oil in the cylinder head 212.

[0041] In one embodiment, the oil return holes 212a are adjacent to the outer wall of the connecting boss 212e and the inner wall of the receiving cavity 2120, and the outer wall of the connecting boss 212e and the inner wall of the receiving cavity 2120 form protective walls for protecting the oil return holes 212a. This arrangement helps to improve the structural strength at the oil return holes 212a, thereby improving the overall strength of the cylinder head 212.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An engine, comprising: A housing, the housing including a crankcase and a cylinder head; A crankshaft located within the crankcase and rotatably connected to the crankcase; Its features are, The cylinder head has a receiving cavity and an oil return hole. The upper opening of the oil return hole is connected to the bottom of the receiving cavity. The oil return hole is used to deliver lubricating oil to the crankcase. When the motorcycle is parked, the height of one side of the cylinder head along the width direction of the motorcycle frame is lower than the height of the other side. The side of the cylinder head with the lower height is defined as the tilt side. The oil return hole is located on the cylinder head closest to the tilt side.

2. The engine according to claim 1, characterized in that, Define a preset straight line, the cylinder head extends substantially along the preset straight line, the bottom of the receiving cavity forms an upwardly protruding structure, the protruding structure extends substantially along the preset straight line; the cylinder head has an intake passage and an exhaust passage, along a direction perpendicular to the preset straight line, the intake passage and the exhaust passage are distributed on both sides of the protruding structure, and the oil return hole is located on at least one side of the protruding structure along the direction perpendicular to the preset straight line.

3. The engine according to claim 2, characterized in that, The bottom of the receiving cavity is provided with two flow surfaces, which are located on both sides of the protruding structure. The oil return hole is located on the flow surface. The flow surface is curved, and the side of the flow surface near the protruding structure is higher than the side of the flow surface near the oil return hole.

4. The engine according to claim 2, characterized in that, There are two oil return holes, which are distributed on both sides of the protruding structure.

5. The engine according to claim 2, characterized in that, A cylinder head water jacket is provided inside the cylinder head. The outlet of the cylinder head water jacket is located on the inclined side. The protruding structure at least partially surrounds the outlet of the cylinder head water jacket and protrudes upward, so that the distance between the inner wall of the outlet and the surface of the receiving cavity is substantially the same.

6. The engine according to claim 1, characterized in that, The engine includes a timing mechanism that is drivenly connected to the crankshaft; the cylinder head includes a timing chamber, and the timing mechanism is at least partially located within the timing chamber, the timing chamber being located on the side of the cylinder head away from the tilted side.

7. The engine according to claim 3, characterized in that, The engine further includes an ignition mechanism, and the cylinder head includes an ignition hole for accommodating the ignition mechanism; when viewed axially from the ignition hole, the cylinder head is basically quadrilateral in shape, and the regions within the accommodating cavity near the two vertices of the inclined side are defined as two inclined regions, and the oil return hole is located at at least one of the inclined regions of the cylinder head.

8. The engine according to claim 7, characterized in that, The cylinder head has a connecting boss for bolts to pass through and a connecting hole that passes through the connecting boss and the cylinder head. When the motorcycle is in a parked state, the highest point of the connecting boss is higher than the highest point of the oil return hole.

9. The engine according to claim 8, characterized in that, Two connecting bosses are provided, and the two connecting bosses are distributed on both sides of the protruding structure. At least one oil return hole is located between the connecting boss and the protruding structure. The oil return hole is adjacent to the outer wall of the connecting boss and the inner wall of the receiving cavity. The outer wall of the connecting boss and the inner wall of the receiving cavity form a protective wall for protecting the oil return hole.

10. A motorcycle, comprising: Frame; A body panel that at least partially covers the vehicle frame; A walking system, at least partially located below the vehicle frame; Its features are, The motorcycle also includes an engine as described in any one of claims 1 to 9, the engine being supported by the frame and connected in drive to the running system.

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