Multi-oil-return-channel engine and motorcycle

Abstract

The engine is provided with oil return channels for returning lubricating oil to a crankcase from a cylinder head through a cylinder body, and each oil return channel comprises a middle oil return path located in the middle, a chain cavity side oil return path and a non-chain cavity side oil return path, wherein the chain cavity side oil return path and the non-chain cavity side oil return path are located on the two sides of the middle; according to the multi-oil-return-channel engine and the motorcycle, by arranging the three oil return ways, it can be guaranteed that lubricating oil of an engine cylinder head can rapidly flow back to the crankcase under different driving conditions of the motorcycle, and therefore a large amount of lubricating oil does not need to be injected into the crankcase, the control performance of the whole motorcycle is improved, and loss of the engine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycles, and in particular to an engine with multiple oil return channels and a motorcycle. Background Art

[0002] The camshaft and other parts installed on the engine cylinder head need to be lubricated with lubricating oil. The lubricating oil after lubrication often returns to the crankcase through the timing chain cavity that is connected to the camshaft installation chamber to meet the circulation needs of the lubricating system lubricating oil and avoid the lubricating oil circuit from sucking air and affecting the lubrication of the engine. The existing parallel twin-cylinder dual camshaft structure is often used in vertical engines. After the horizontal engine is arranged with a dual camshaft structure, in order to ensure that the oil at the lowest point of the cylinder head chain cavity returns to the crankcase along the chain cavity, the center of the engine cylinder and the horizontal plane are often designed to be at a large angle, thereby reducing the distance between the engine and the vehicle storage box. The storage box space is designed to place a single full helmet. In order to meet the need of placing two full helmets in the storage box, an oil return channel is often designed in the camshaft operating chamber of the cylinder head to allow the engine oil on the cylinder head to return to the crankcase for circulation of the lubrication system. The timing chain in the chain chamber is lubricated by oil injection through the injection pipe designed in the crankcase. However, in this structure, due to the small horizontal angle between the cylinder head and the crankcase, the position of the chain chamber under the cam is lower than the oil return port due to the dual camshaft structure. At the same time, the number of oil return channels is limited, and the lubricating oil on the engine cylinder head returns slowly. In order to meet the circulating oil consumption of the lubrication system, a large amount of lubricating oil needs to be added to the engine crankcase to avoid cavitation in the oil circuit and affect the lubrication of the engine. However, the addition of a large amount of lubricating oil will make the engine heavier, the vehicle's handling is lower, and the engine loss is increased.

[0003] Therefore, it is necessary to improve the engine structure in the prior art and to improve the engine lubricating oil return oil circuit structure, so that the lubricating oil inside the engine can be quickly returned from the cylinder head to the crankcase without adding a large amount of lubricating oil into the engine crankcase. This allows the weight of the entire vehicle to be reduced compared to the prior art while meeting the performance requirements, thereby improving the handling of the entire vehicle. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an engine and a motorcycle with multiple oil return channels, and to improve the structure of the engine lubricating oil return oil circuit, so as to realize the rapid return of the lubricating oil inside the engine from the cylinder head to the crankcase, without adding a large amount of lubricating oil into the engine crankcase, thereby reducing the weight of the whole vehicle compared with the prior art while meeting the performance requirements, thereby improving the handling of the whole vehicle.

[0005] The multi-return oil channel engine of the present invention is arranged with an oil return channel for returning lubricating oil from the cylinder head to the crankcase through the cylinder body, and the oil return channel includes a middle oil return oil circuit located in the middle and a chain chamber side oil return oil circuit and a non-chain chamber side oil return oil circuit located on both sides of the middle.

[0006] Furthermore, the engine is a twin-cylinder engine, the middle oil return circuit is located between the two cylinders, and the chain chamber side oil return circuit and the non-chain chamber side oil return circuit are located on both sides of the two cylinders respectively.

[0007] Furthermore, the engine has a chain chamber, the chain chamber side oil return oil passage is arranged at the inner side of the chain chamber and communicated with the chain chamber, and the bottom surface of the chain chamber side oil return oil passage is lower than the bottom surface of the chain chamber.

[0008] Furthermore, the highest point of the chain chamber side oil return oil passage is located at a position of the engine close to the front of the motorcycle, and extends obliquely rearward and downward to the oil chamber opening of the right crankcase;

[0009] The bottom surface of the chain chamber side oil return oil passage forms an included angle of a set angle with the horizontal plane.

[0010] Further, the chain chamber side oil return oil circuit includes a cylinder head oil return section, a cylinder block oil return section and a right crankcase oil return section, the chain chamber includes a cylinder head chain chamber, a cylinder block chain chamber and a right crankcase chain chamber, and the cylinder head oil return section, the cylinder block oil return section and the right crankcase oil return section are respectively connected to the cylinder head chain chamber, the cylinder block chain chamber and the right crankcase chain chamber;

[0011] The highest point of the chain chamber side oil return oil passage is located at the lowest point of the timing chain on the exhaust camshaft side of the cylinder head.

[0012] Furthermore, the cylinder oil return section is located at the bottom of the engine and the lowest point of the cylinder oil return section is located near the connection between the cylinder and the right crankcase, and is located between the cylinder water inlet chamber and the cylinder guide plate mounting groove, and the cylinder guide plate mounting groove is used to position the guide plate.

[0013] Furthermore, the right crankcase oil return section is located at the bottom of the engine and the highest point of the right crankcase oil return section is located near the connection between the cylinder block and the right crankcase, and is located below the guide plate positioning boss of the right crankcase.

[0014] Furthermore, it also includes a middle oil chamber arranged between two cylinders and located in the middle of the cylinder head, the middle oil return oil circuit is connected to the middle oil chamber and the left crankcase, and is located at the bottom of the engine, the middle oil return oil circuit includes a middle oil return hole in the cylinder head, a middle oil return hole in the cylinder body and a middle oil return hole in the left crankcase which are connected in sequence, and the middle oil return hole in the cylinder head is connected to the middle oil chamber.

[0015] Furthermore, it also includes a non-chain chamber side oil chamber arranged on the left side of the middle oil chamber, the non-chain chamber side oil return oil circuit is connected to the non-chain chamber side oil chamber and the left crankcase, the non-chain chamber side oil return oil circuit includes the cylinder head non-chain chamber side oil return hole, the cylinder body non-chain chamber side oil return hole and the left crankcase non-chain chamber side oil return hole which are connected in sequence, and the cylinder head non-chain chamber side oil return hole is connected to the non-chain chamber side oil chamber.

[0016] The motorcycle of the present invention is equipped with the engine with multiple oil return channels.

[0017] The beneficial effects of the present invention are as follows: the multi-return oil channel engine and motorcycle of the present invention improve the lubricating oil return structure of the engine, and three oil return oil paths are arranged in the engine, so that the lubricating oil in the cylinder head can quickly fall back to the crankcase when the motorcycle is in different driving conditions, thereby reducing the amount of engine oil filling, avoiding the oil pump sucking empty and causing poor lubrication and damage to the engine, reducing the weight of the whole vehicle compared with the prior art, and improving the maneuverability of the whole vehicle. At the same time, it also avoids the problem that the lubricating oil cannot be returned to the crankcase and is stored in the cylinder head and exhaust camshaft, resulting in a large heat load on the engine and reduced performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 Another perspective shows the structure of the cylinder head;

[0021] Figure 3 is a schematic diagram of the structure of the chain cavity;

[0022] Figure 4 This is a schematic diagram of the oil return circuit structure on the chain chamber side;

[0023] Figure 5 for Figure 2 Sectional view along CC direction;

[0024] Figure 6 for Figure 2 Cross-sectional view along the DD direction;

[0025] Figure 7 This is a schematic diagram of the crankcase oil return position;

[0026] Figure 8 This is a schematic diagram of the oil return position of the cylinder;

[0027] Fig. 9 This is a schematic diagram of the oil return position of the cylinder head;

[0028] Fig.10It is a schematic diagram of the cylinder head chain chamber structure;

[0029] The above drawings contain the following reference numerals:

[0030] 1. Chain chamber; 1a. Right crankcase chain chamber; 1b. Cylinder chain chamber; 1c. Cylinder head chain chamber; 2. Chain chamber side oil return circuit; 2a. Right crankcase oil return section; 2b. Cylinder oil return section; 2c. Cylinder head oil return section; 3. Exhaust camshaft; 4. Timing driven wheel; 5. Timing chain; 6. Guide plate; 7. Right crankcase; 7a. Guide plate positioning boss; 8. Middle oil return circuit; 8a. Middle oil return hole of left crankcase ; 8b, oil return hole in the middle of the cylinder block; 8c, oil return hole in the middle of the cylinder head; 9, oil return circuit on the non-chain chamber side; 9a, oil return hole on the non-chain chamber side of the left crankcase; 9b, oil return hole on the non-chain chamber side of the cylinder block; 9c, oil return hole on the non-chain chamber side of the cylinder head; 10, left crankcase; 11, cylinder block; 11a, water inlet chamber of the cylinder block; 11b, cylinder guide plate mounting groove; 12, cylinder head; 12a, middle oil chamber; 12b, oil chamber on the non-chain chamber side. DETAILED DESCRIPTION

[0031] Figure 1 It is a structural schematic diagram of the present invention, Figure 2 for Figure 1 Another perspective hides the structural diagram of the cylinder head. Figure 3 is the structural diagram of the chain cavity. Figure 4 This is a schematic diagram of the oil return circuit structure on the chain chamber side. Figure 5 for Figure 2 Sectional view along CC direction, Figure 6 for Figure 2 Cross-sectional view along DD direction, Figure 7 This is a schematic diagram of the crankcase oil return position. Figure 8 This is a schematic diagram of the cylinder oil return position. Fig. 9 This is a schematic diagram of the cylinder head oil return position. Fig.10 It is a schematic diagram of the cylinder head chain cavity structure, such as Figure 1-10As shown: the multi-return oil channel engine of the present embodiment, the engine is arranged with an oil return channel for returning lubricating oil from the cylinder head 12 to the crankcase through the cylinder block 11, the oil return channel includes a central oil return oil passage 8 located in the middle and a chain chamber side oil return oil passage 2 and a non-chain chamber side oil return oil passage 9 located on both sides of the middle; in the present structure, the engine is a horizontal parallel twin-cylinder dual camshaft engine, the middle is the left and right direction relative to the motorcycle, the chain chamber side oil return oil passage 2 is relatively located on the right part of the engine, the non-chain chamber side oil return oil passage 9 is relatively located on the left part of the engine, the left and right parts are the left and right directions of the motorcycle, the chain chamber side oil return oil passage 2 extends from the inside of the cylinder head 12 through the inside of the cylinder block 11 to the crankcase, the central oil return oil passage 8 extends from the inside of the cylinder head 12 through the inside of the cylinder block 11 to the crankcase, and the non-chain chamber side oil return oil passage 9 extends from the inside of the cylinder head 12 through the inside of the cylinder block 11 to the crankcase To the crankcase, by setting up three oil return circuits, when the whole vehicle is riding normally, the chain chamber side oil return circuit 2, the middle oil return circuit 8 and the non-chain chamber side oil return circuit 9 can all enable the lubricating oil on the cylinder head 12 to quickly fall back into the crankcase. When the whole vehicle is riding on an inclined left side, the middle oil return circuit 8 and the non-chain chamber side oil return circuit 9 can enable the lubricating oil on the cylinder head 12 to quickly fall back into the crankcase. When the whole vehicle is riding on an inclined right side, the chain chamber side oil return circuit 2 and the middle oil return circuit 8 can enable the lubricating oil on the cylinder head to quickly fall back into the crankcase. In this way, the lubricating oil can quickly fall back from the cylinder head 12 to the crankcase under different driving conditions, meeting the oil return demand of the lubrication system without adding a large amount of lubricating oil into the crankcase, thereby reducing the weight of the whole vehicle, improving the handling performance, and avoiding the lubricating oil remaining in the cylinder head 12 and the exhaust camshaft 3, resulting in a large thermal load on the engine and reduced performance.

[0032] In the prior art, in order to meet the need of placing two full helmets in the storage box of a motorcycle, an oil return channel is often designed in the camshaft operating chamber of the cylinder head of the engine to meet the requirement of returning the engine oil on the cylinder head to the crankcase for circulation of the lubrication system, and the timing chain 5 in the chain chamber is lubricated by oil injection through an oil injection pipe designed in the crankcase; however, in this structure, due to the small horizontal angle between the cylinder head and the crankcase, the position of the chain chamber under the cam in the dual camshaft structure is lower than the oil return port, and the number of oil return channels is limited, and the lubricating oil on the engine cylinder head returns slowly. In order to meet the circulating oil consumption of the lubrication system, a large amount of lubricating oil needs to be added to the engine crankcase to avoid cavitation in the oil circuit, which affects the lubrication of the engine. The addition of a large amount of lubricating oil will make the engine heavier, the vehicle's maneuverability will be lower, and the engine loss will be increased. The multi-return oil channel engine and motorcycle of the present invention improve the engine's lubricating oil return structure. By arranging three oil return oil channels in the engine, the lubricating oil in the cylinder head can quickly fall back to the crankcase when the motorcycle is in different driving conditions, reducing the amount of engine oil filling, avoiding the oil pump sucking empty and causing poor lubrication and damage to the engine, reducing the weight of the whole vehicle compared with the prior art, improving the maneuverability of the whole vehicle, and also avoiding the problem that the lubricating oil cannot be returned to the crankcase and is stored in the cylinder head and exhaust camshaft 3, resulting in a large heat load on the engine and reduced performance.

[0033] In the present embodiment, the engine is a twin-cylinder engine, the middle oil return circuit 8 is located in the middle of the two cylinders, the chain chamber side oil return circuit 2 and the non-chain chamber side oil return circuit 9 are respectively located on the two sides of the two cylinders; in the present structure, the engine is a horizontal parallel twin-cylinder engine, the middle oil return circuit 8 is located in the middle of the two cylinders (relative to the middle of the left and right direction of the motorcycle), the chain chamber side oil return circuit 2 is located on the right side of the middle oil return circuit 8, and the non-chain chamber side oil return circuit 9 is located on the left side of the middle oil return circuit 8, so that the chain chamber side oil return circuit 2, the middle oil return circuit 8 and the non-chain chamber side oil return circuit 9 are respectively distributed on the right, middle and left parts of the engine, so that the lubricating oil can be quickly returned from the cylinder head to the crankcase when the motorcycle is in different driving conditions.

[0034] In this embodiment, the engine has a chain chamber 1, and the chain chamber side oil return circuit 2 is arranged on the inner side of the chain chamber 1 and is connected to the chain chamber 1, and the bottom surface of the chain chamber side oil return circuit 2 is lower than the bottom surface of the chain chamber 1; in this structure, the chain chamber 1 is generally used to arrange the timing chain 5 of the engine, and the chain chamber structure, the chain arranged in the chain chamber 1 and other structures are the same as the prior art, and are not repeated here. The inner side is the left side of the chain chamber 1 or the side of the chain chamber 1 close to the cam, and the chain chamber side oil return circuit 2 is located between the chain chamber 1 and the mounting seat of the exhaust camshaft 3 of the cylinder head 12. The chain chamber side oil return passage 2 is located at the bottom of the engine (relative to the up and down direction of the motorcycle, that is, close to the exhaust side) when set, and the bottom surface of the chain chamber side oil return passage 2 (relative to the bottom surface in the up and down direction of the motorcycle, that is, the lower side surface) is lower than the bottom surface of the chain chamber 1. By adding the chain chamber side oil return passage 2 and the bottom surface of the chain chamber side oil return passage 2 is lower than the bottom surface of the chain chamber 1, the lubricating oil on the cylinder head 12 can be quickly returned to the right crankcase 7. Compared with the oil return structure in the prior art, the structure is simpler, no other structures need to be set, and processing is convenient.

[0035] In this embodiment, the highest point of the chain chamber side oil return oil circuit 2 is located at the position of the engine near the front of the motorcycle, and extends obliquely downward and rearward to the oil chamber opening of the right crankcase 7; the right crankcase 7 is provided with an oil chamber, and the oil chamber opening is the oil return opening of the oil chamber (not shown in the figure), and the highest point of the chain chamber side oil return oil circuit 2 is located at the position of the engine near the front of the motorcycle, and extends obliquely downward and rearward (relative to the front and rear direction of the motorcycle) to the oil chamber opening of the right crankcase 7, that is, the chain chamber side oil return oil circuit 2 is a structure with a low left and a high right (relative to the front and rear direction of the motorcycle). Figure 4 Compared with the prior art, the right part of the engine returns oil through the chain chamber 1, and the structure of the chain chamber 1 is a structure with high left and low right (relative to Figure 3 In the left and right directions), in some cases, the oil cannot be returned. In this structure, by setting the chain chamber side oil return oil passage 2 and forming a left low and right high structure, it can be ensured that the lubricating oil of the cylinder head 12 can quickly return to the right crankcase 7;

[0036] The bottom surface of the chain chamber side oil return circuit 2 forms an angle of a set angle with the horizontal plane; the bottom surface of the chain chamber side oil return circuit 2 forms an angle of a set angle with the horizontal plane, that is, the chain chamber side oil return circuit 2 is inclined, which is conducive to the rapid return of the lubricating oil to the right crankcase 7, and the angle can be set according to actual use needs.

[0037] In this embodiment, the chain chamber side oil return circuit 2 includes a cylinder head oil return section 2c, a cylinder body oil return section 2b and a right crankcase oil return section 2a, and the chain chamber 1 includes a cylinder head chain chamber 1c, a cylinder body chain chamber 1b and a right crankcase chain chamber 1a, and the cylinder head oil return section 2c, the cylinder body oil return section 2b and the right crankcase oil return section 2a are respectively connected to the cylinder head chain chamber 1c, the cylinder body chain chamber 1b and the right crankcase chain chamber 1a; the cylinder head oil return section 2c, the cylinder body oil return section 2b and the right crankcase oil return section 2a are respectively connected to the cylinder head chain chamber 1c, the cylinder body chain chamber 1b and the right crankcase chain chamber 1a, so that the lubricating oil can be lubricated to the structure that needs to be lubricated in the cylinder head 12, and can quickly flow back to the right crankcase 7 through the chain chamber side oil return circuit 2;

[0038] The highest point of the chain chamber side return oil circuit 2 is located at the lowest point of the timing chain 5 on the exhaust camshaft 3 side of the cylinder head 12; the highest point of the chain chamber side return oil circuit 2 is located at the lowest point of the timing chain 5 at the timing driven wheel 4 on the exhaust camshaft 3 side of the cylinder head 12 (the lowest point in the up and down direction relative to the motorcycle), thereby ensuring that the lubricating oil fully lubricates the parts of the engine's valve mechanism that need lubrication, while allowing the lubricating oil in various places to flow back to the right crankcase 7. The specific structure of the valve mechanism, such as the structure of the exhaust camshaft 3, the timing chain 5 and the timing driven wheel 4, is an application of the prior art and will not be repeated here.

[0039] In this embodiment, the cylinder oil return section 2b is located at the bottom of the engine and the lowest point of the cylinder oil return section 2b is located near the connection between the cylinder 11 and the right crankcase 10, and is located between the cylinder water inlet chamber 11a and the cylinder guide plate mounting groove 11b. The cylinder guide plate mounting groove 11b is used to position the guide plate 6; the cylinder oil return section is located between the cylinder water inlet chamber 11a and the cylinder guide plate mounting groove 11b relative to the left and right direction of the motorcycle. The structure of the cylinder water inlet chamber 11a and the cylinder guide plate mounting groove 11b is an application of the prior art and will not be repeated here. The guide plate 6 is a part of the structure of the timing chain 5 and is installed in a matching position with the timing chain 5. The setting is prior art and will not be described in detail here; the cylinder oil return section 2b is located at the bottom of the engine (relative to the up and down direction of the motorcycle, or the side close to the exhaust side), and the highest point of the cylinder oil return section 2b is located near the connection between the cylinder head 12 and the cylinder body 11 (relative to the highest point in the front and rear direction of the motorcycle). Nearby means that the highest point of the cylinder oil return section 2b can be located at the connection between the cylinder head 12 and the cylinder body 11 or near the connection, and extends rearward and downward to the connection between the cylinder body 11 and the right crankcase 10 (that is, the lowest point of the cylinder oil return section 2b is located near the connection between the cylinder body 11 and the right crankcase 10), so as to facilitate the rapid return of the lubricating oil to the right crankcase.

[0040] In this embodiment, the right crankcase oil return section 2a is located at the bottom of the engine and the highest point of the right crankcase oil return section 2a is located near the connection between the cylinder block 11 and the right crankcase 10, and is located at the lower part of the guide plate positioning boss 7a of the right crankcase 7; the right crankcase oil return section 2a is located at the lower part of the guide plate positioning boss 7a (relative to Figure 7 In the up and down directions, the guide plate positioning boss 7a is used to position and install the guide plate 6, which is an application of the prior art and will not be described in detail here. At the same time, the highest point of the right crankcase oil return section 2a is located near the connection between the cylinder body 11 and the right crankcase 10, that is, the highest point of the right crankcase oil return section 2a can be located at the connection between the cylinder body 11 and the right crankcase 10 or near the connection, so that the lubricating oil can flow through the cylinder body 11 and quickly return to the right crankcase 10 when returning.

[0041] In this embodiment, it also includes a middle oil chamber 12a disposed between the two cylinders and located in the middle of the cylinder head 12, the middle oil return oil path 8 is connected to the middle oil chamber 12a and the left crankcase 10, and is located at the bottom of the engine, the middle oil return oil path 8 includes a middle oil return hole 8c of the cylinder head, a middle oil return hole 8b of the cylinder body and a middle oil return hole 8a of the left crankcase that are connected in sequence, the middle oil return hole 8c of the cylinder head is connected to the middle oil chamber 12a; in the middle between the two cylinders of the engine (relative to the left and right direction of the motorcycle), A middle oil chamber 12a is provided (in the middle relative to the up and down direction of the motorcycle), and the middle oil chamber 12a is provided in the cylinder head 12, and a middle oil return oil circuit 8 is provided near the bottom of the motorcycle (relative to the up and down direction of the motorcycle), and the middle oil return oil circuit 8 is connected to the middle oil chamber 12a and the oil chamber of the left crankcase 10 (not shown in the figure), and the middle oil return hole 8c of the cylinder head of the middle oil return oil circuit 8 is connected to the middle oil chamber 12a, so that the lubricating oil of the cylinder head 12 can quickly flow back to the oil chamber of the left crankcase 10.

[0042] In the present embodiment, it also includes a non-chain chamber side oil chamber 12b arranged on the left side of the middle oil chamber 12a, and the non-chain chamber side oil return oil circuit 9 is connected to the non-chain chamber side oil chamber 12b and the left crankcase 10, and the non-chain chamber side oil return oil circuit 9 includes a cylinder head non-chain chamber side oil return hole 9c, a cylinder body non-chain chamber side oil return hole 9b and a left crankcase non-chain chamber side oil return hole 9a which are connected in sequence, and the cylinder head non-chain chamber side oil return hole 9c is connected to the non-chain chamber side oil chamber 12b; the non-chain chamber side oil chamber 12b is arranged In the cylinder head 12 of the left cylinder, the left side is relative to the left and right direction of the motorcycle, and the non-chain chamber side is used to distinguish the chain chamber side and the non-chain chamber side of the engine (that is, relative to the left side of the engine). The structure of the non-chain chamber side and the structure of the engine installed inside are applications of the prior art and are not described in detail here; the non-chain chamber side oil return hole 9c of the cylinder head of the non-chain chamber side oil return circuit 9 is connected to the non-chain chamber side oil chamber 12b, so that the lubricating oil in the cylinder head 12 can quickly flow back to the left crankcase 10.

[0043] The motorcycle of the present embodiment is equipped with the engine with multiple oil return channels. The motorcycle of the present invention provides an oil return channel extending from the cylinder head through the cylinder body to the crankcase at the left, middle and right parts of the engine, respectively. Thus, the lubricating oil can quickly flow back from the cylinder head 12 to the crankcase under various driving conditions of the whole vehicle, thereby eliminating the need to add a large amount of lubricating oil to the crankcase. At the same time, the overall oil return channel structure is simpler than the prior art, and no other auxiliary oil return structure is required.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A multi-return oil channel engine, characterized in that: The engine is arranged with an oil return channel for returning lubricating oil from the cylinder head to the crankcase through the cylinder body, and the oil return channel includes a middle oil return oil circuit located in the middle and a chain chamber side oil return oil circuit and a non-chain chamber side oil return oil circuit located on both sides of the middle.

2. The multi-return oil channel engine according to claim 1, characterized in that: The engine is a twin-cylinder engine, the middle oil return circuit is located between the two cylinders, and the chain chamber side oil return circuit and the non-chain chamber side oil return circuit are located on both sides of the two cylinders respectively.

3. The multi-return oil channel engine according to claim 1, characterized in that: The engine has a chain chamber, the chain chamber side oil return oil passage is arranged at the inner side of the chain chamber and communicated with the chain chamber, and the bottom surface of the chain chamber side oil return oil passage is lower than the bottom surface of the chain chamber.

4. The multi-return oil channel engine according to claim 3, characterized in that: The highest point of the chain chamber side oil return oil passage is located at the position of the engine close to the front of the motorcycle, and extends obliquely rearward and downward to the oil chamber opening of the right crankcase; The bottom surface of the chain chamber side oil return oil passage forms an included angle of a set angle with the horizontal plane.

5. The multi-return oil channel engine according to claim 4, characterized in that: The chain chamber side oil return oil circuit includes a cylinder head oil return section, a cylinder body oil return section and a right crankcase oil return section, the chain chamber includes a cylinder head chain chamber, a cylinder body chain chamber and a right crankcase chain chamber, and the cylinder head oil return section, the cylinder body oil return section and the right crankcase oil return section are respectively connected to the cylinder head chain chamber, the cylinder body chain chamber and the right crankcase chain chamber; The highest point of the chain chamber side oil return oil passage is located at the lowest point of the timing chain on the exhaust camshaft side of the cylinder head.

6. The multi-return oil channel engine according to claim 5, characterized in that: The cylinder oil return section is located at the bottom of the engine and the lowest point of the cylinder oil return section is located near the connection between the cylinder and the right crankcase, and is located between the cylinder water inlet cavity and the cylinder guide plate mounting groove, and the cylinder guide plate mounting groove is used to position the guide plate.

7. The multi-return oil channel engine according to claim 5, characterized in that: The right crankcase oil return section is located at the bottom of the engine and the highest point of the right crankcase oil return section is located near the connection between the cylinder block and the right crankcase and is located below the guide plate positioning boss of the right crankcase.

8. The multi-return oil channel engine according to claim 2, characterized in that: It also includes a middle oil chamber arranged between two cylinders and located in the middle of the cylinder head. The middle oil return oil circuit is connected to the middle oil chamber and the left crankcase and is located at the bottom of the engine. The middle oil return oil circuit includes a middle oil return hole in the cylinder head, a middle oil return hole in the cylinder body and a middle oil return hole in the left crankcase which are connected in sequence. The middle oil return hole in the cylinder head is connected to the middle oil chamber.

9. The multi-return oil channel engine according to claim 8, characterized in that: It also includes a non-chain chamber side oil chamber arranged on the left side of the middle oil chamber, the non-chain chamber side oil return oil circuit is connected to the non-chain chamber side oil chamber and the left crankcase, the non-chain chamber side oil return oil circuit includes a cylinder head non-chain chamber side oil return hole, a cylinder body non-chain chamber side oil return hole and a left crankcase non-chain chamber side oil return hole which are connected in sequence, and the cylinder head non-chain chamber side oil return hole is connected to the non-chain chamber side oil chamber.

10. A motorcycle, characterized in that: An engine having multiple oil return channels as claimed in any one of claims 1 to 9 is installed.

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