CN112431652A

CN112431652A - Oil return structure of motorcycle engine

Info

Publication number: CN112431652A
Application number: CN202011401414.7A
Authority: CN
Inventors: 李良; 邓定红; 张立成; 程雪君; 周鹏博
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-03-02

Abstract

The invention provides an oil return structure of a motorcycle engine, and belongs to the technical field of motorcycles. The motorcycle engine solves the problem that the balance of air pressure between the valve chamber and the crankcase is difficult to be considered when the valve chamber returns oil in the existing motorcycle engine. The oil return structure of the motorcycle engine comprises a cylinder head, wherein a valve chamber is arranged in the cylinder head, the oil return structure comprises a main oil duct which is arranged at the bottom of the cylinder head and used for being communicated with a crankcase, an oil return channel and an air return channel are also arranged on the cylinder head from top to bottom, the lower ends of the oil return channel and the air return channel are communicated with the main oil duct, the upper end port of the oil return channel is positioned on the bottom surface of the valve chamber, and the upper end port of the air return channel is higher than the upper end port of the oil return channel and is positioned in the middle of the valve chamber in. The motorcycle engine can balance air pressure between the valve chamber and the crankcase when the valve chamber returns oil.

Description

Oil return structure of motorcycle engine

Technical Field

The invention belongs to the technical field of motorcycles, and relates to an oil return structure of a motorcycle engine.

Background

Motorcycle engine includes the cylinder end, fix the cylinder cap at cylinder end top surface and fix the cylinder body in cylinder end bottom surface, be fixed with the crankcase in the cylinder body lower part, the crankcase lower part is fixed with the oil pan, be equipped with the combustion chamber in the cylinder body, be equipped with the piston in the combustion chamber, the piston passes through the bent axle operation in the connecting rod drive below crankcase, then be equipped with the valve chamber in the cylinder end, be equipped with the camshaft in the valve chamber, the rocking arm, the valve etc., it is corresponding, inlet channel and the exhaust passage with combustion chamber top intercommunication can also be seted up on the cylinder end, inlet channel and exhaust passage department all set up the valve, still be equipped with the rocking arm axle in the cylinder end, the rocking arm sets up epaxially at the rocking arm, rocking arm one end is supported the cam on the camshaft, the other end supports with the valve top and supports, rotate through the rocking. In the working process of the engine, the camshaft, the rocker shaft and the like need to be lubricated and cooled, so the engine is also provided with a circulating oil path, namely, oil is stored in the oil pan when the engine does not work, the oil pump sequentially conveys the engine oil in the oil pan to the valve chamber for injection lubrication when the engine works, and the lubricated engine oil is precipitated in the valve chamber and then returns to the crankcase and the oil pan through an oil return channel.

For example, patent document 201520590837.6 discloses a cylinder head of a motorcycle engine, the cylinder head is provided with a valve spring cavity, the lower part of the side wall of the spring cavity is provided with an oil return hole, the oil return hole and a reinforcing rib of the valve spring cavity of the cylinder head are redesigned, when the engine runs, the oil flow in the valve spring cavity is reduced, the oil storage amount of the valve spring cavity of the cylinder head is increased, the valve and the rocker arm are soaked in the oil, the mutual lubrication is increased, the oil return hole is arranged at the lower part of the side wall of the spring cavity but is always higher than the bottom surface of the spring cavity, the oil deposited at the bottom of the spring cavity is difficult to return, namely, the oil return is not thorough, if the position of the oil return hole is too low, the air pressure in the valve cavity can change in the working process, when the oil return hole is immersed by the oil in the working process, the air pressure in the valve cavity, the gas is difficult to enter the crankcase through the oil return hole, and further the gas pressure in the gas chamber in the cylinder head and the gas pressure in the crankcase are unbalanced.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides an oil return structure of a motorcycle engine, which is used for solving the problem that the balance of air pressure between a valve chamber and a crankcase is difficult to be considered when the existing motorcycle engine returns oil in the valve chamber.

The purpose of the invention can be realized by the following technical scheme: the utility model provides an oil return structure of motorcycle engine, the engine includes the cylinder head, the valve chamber has in the cylinder head, oil return structure is including seting up the main oil duct in cylinder head bottom and being used for communicateing the crankcase, its characterized in that, oil return channel and return-air channel have still been seted up from top to bottom on the cylinder head, oil return channel and return-air channel's lower extreme all are linked together with the main oil duct, oil return channel's upper end port is located the bottom surface of valve chamber, return-air channel's upper end port is higher than oil return channel's upper end port and is located the middle part of valve chamber direction of height.

The cylinder head is provided with a cylinder cover at the upper end, the cylinder body is arranged at the lower end, the crankcase is arranged at the lower end of the cylinder body, the oil pan is arranged at the lower end of the crankcase, a valve chamber is arranged in the cylinder head and used for installing a valve, engine oil in the oil pan is conveyed to the valve chamber through an oil pump to lubricate and cool parts such as a cam shaft, a rocker arm and the like in the valve chamber, the engine oil deposited on the bottom surface of the valve chamber enters an oil return channel through a lower port at the upper end of the oil return channel and then enters a main oil duct through the oil return channel and then returns to the crankcase, the cylinder head is also provided with an air return channel, the upper end port of the air return channel is positioned in the middle of the height direction of the valve chamber, so that the air return channel cannot be immersed by the engine oil, when the air pressure in the valve chamber, the lower oil return passage of the upper end port is used for oil backflow, and the higher air return passage of the upper end port is used for ventilation, so that air pressure balance between the valve chamber and the crankcase is guaranteed when oil in the valve chamber flows back.

In the oil return structure of the motorcycle engine, one lateral side of the cylinder head is provided with the chain cavity, the bottom of the other lateral side is provided with the oil outlet used for communicating the crankcase, the main oil duct is transversely arranged, one end of the main oil duct is communicated with the chain cavity, the other end of the main oil duct is communicated with the oil outlet, the oil return channel is communicated with the end part of the main oil duct, and the air return channel is communicated with the middle part of the main oil duct. The lower part of the chain cavity is also communicated with the crankcase, namely the two ends of the main oil duct are communicated with the crankcase, and the oil return channel is communicated with the end part of the main oil duct, so that engine oil directly enters the oil outlet or the chain cavity when flowing into the main oil duct from the oil return channel, the occupation of the main oil duct is reduced, and the oil-gas mixture of the air return channel can pass through more easily.

In the oil return structure of the motorcycle engine, the number of the oil return channels and the number of the air return channels are two, the two oil return channels are respectively located on two transverse sides of the cylinder head, the lower ends of the two oil return channels are respectively communicated with two ends of the main oil duct, and the two air return channels are located between the two oil return channels. Namely, the engine oil of the two oil return channels respectively enters the oil outlet and the chain cavity, the backflow efficiency is higher, and the circulation of the oil-gas mixture in the air return channel is ensured.

In the oil return structure of the motorcycle engine, the lower end of one of the oil return passages is communicated with the oil outlet. Namely, the oil is directly communicated to the oil outlet for backflow, and the backflow efficiency is improved.

In the oil return structure of the motorcycle engine, the cylinder head is provided with a bottom surface used for being matched with the top surface of the cylinder body, the oil return channel and the air return channel are both straight, the oil return channel and the air return channel are both obliquely arranged relative to the bottom surface of the cylinder head, the inclination of the oil return channel is greater than that of the air return channel, and the length of the oil return channel is smaller than that of the air return channel. Through the difference of the inclination of the oil return channel and the inclination of the air return channel, the upper end port of the oil return channel is lower, so that the engine oil can conveniently flow back, the upper end port of the air return channel is higher, the engine oil is prevented from being immersed, and the oil-gas moderator can conveniently pass through.

In the oil return structure of the motorcycle engine, the passage sectional areas of the oil return passage and the air return passage are both smaller than the passage sectional area of the main oil passage, and the passage sectional area of the oil return passage is larger than the passage sectional area of the air return passage. Namely, the oil return channel and the air return channel can be converged into the main oil duct and can ensure smooth passing, and the passing sectional area of the oil return channel is larger than that of the air return channel, so that the quick return of the engine oil is ensured.

In the oil return structure of the motorcycle engine, the cylinder head is provided with two exhaust passages arranged transversely, the main oil duct is positioned below the two exhaust passages, the two return passages are positioned between the two exhaust passages and respectively close to the two exhaust passages, the two exhaust passages are positioned between the two return passages and respectively close to the two exhaust passages. The inner end of the exhaust passage is communicated with the combustion chamber and used for discharging waste gas after combustion in the combustion chamber, the waste gas has higher temperature, so that the temperature of one side of the cylinder head, on which the exhaust passage is arranged, is higher, the main oil duct, the oil return passage and the air return passage are arranged on one side of the cylinder head, the temperature of the side can be reduced, and meanwhile, the temperature difference of two ends of the cylinder head is reduced through symmetrical and uniform arrangement.

In the oil return structure of the motorcycle engine, the inner wall of the valve chamber is provided with an installation part which protrudes inwards, the exhaust passage is arranged inside the installation part, and the two air return passages are arranged on the installation part. The air return channel is arranged on the mounting part, and the height of the upper end port of the air return channel is increased.

In the oil return structure of the motorcycle engine, one end of the main oil duct, which is far away from the chain cavity, penetrates through the side wall of the cylinder head, and the port of one end of the main oil duct, which is far away from the chain cavity, is blocked by the plug. The end part of the main oil duct penetrates through the side wall of the cylinder head, so that later-period maintenance and cleaning are facilitated.

Compared with the prior art, the oil return structure of the motorcycle engine has the following advantages:

1. because still be equipped with the return air passageway on the cylinder head, the upper end port of this return air passageway is located the middle part of valve chamber direction of height, consequently can not submerge by machine oil, and when the air pressure was too big in the valve chamber, oil-gas mixture can get into the main oil duct through the return air passageway, gets into the crankcase by the main oil duct again to play the effect of balanced air pressure between valve chamber and the crankcase.

2. Because the temperature of the side of the cylinder head, which is provided with the exhaust channel, is higher, the main oil duct, the oil return channel and the air return channel are arranged on the exhaust side of the cylinder head and are close to the exhaust channel, the temperature of the side can be reduced, and meanwhile, the temperature difference at the two ends of the cylinder head is reduced through symmetrical and uniform arrangement.

Drawings

Fig. 1 is a perspective view of a cylinder head.

Fig. 2 is a structural plan view of the cylinder head.

Fig. 3 is a sectional view of the structure at a-a in fig. 2.

Fig. 4 is a sectional view of the structure at B-B in fig. 2.

Fig. 5 is a structural sectional view of the cylinder head at C-C in fig. 3.

Figure 6 is a cross-sectional view of the cylinder head at D-D in figure 4.

In the figure, 1, a cylinder head; 11. a valve chamber; 12. a chain cavity; 13. an exhaust passage; 14. an installation part; 2. a main oil gallery; 3. an oil return passage; 4. a gas return channel; 5. an oil outlet; 6. and (7) a plug.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, an oil return structure of a motorcycle engine comprises a cylinder head 1, a cylinder cover is arranged on the top surface of the cylinder head 1 in a matching way, a cylinder body is arranged on the bottom surface in a matching way, a valve chamber 11 is arranged in the cylinder head 1, the valve chamber 11 is used for installing a valve, a camshaft, a rocker arm and the like, a chain cavity 12 is arranged on one side of the cylinder body in the transverse direction, two exhaust passages 13 which are arranged in the transverse direction are arranged on the cylinder head 1, an inward-convex installation part 14 is arranged on the inner wall of the valve chamber 11, the exhaust passages 13 are arranged in the installation part 14, as shown in fig. 3 and 4, the oil return structure comprises a main oil duct 2 arranged at the bottom of the cylinder head 1, the main oil duct 2 is arranged at the edge of the bottom of the cylinder head 1 in the transverse direction, the main oil duct 2 is positioned below the two exhaust passages 13 and close to the exhaust passages 13, one end of the main oil duct, the other end penetrates through the side wall of the cylinder head 1, and one end penetrating through the side wall of the cylinder head 1 is blocked by a plug 6. An oil outlet 5 is further formed in the bottom of the cylinder head 1, the oil outlet 5 is used for being communicated with a crankcase, one end, penetrating through the side wall of the cylinder head 1, of the main oil duct 2 is further communicated with the oil outlet 5 and is used for being connected with the main oil duct 2 of the crankcase, two oil return channels 3 and two air return channels 4 are further formed in the cylinder head 1 from top to bottom, the lower ends of the two oil return channels 3 and the lower ends of the two air return channels 4 are communicated with the main oil duct 2, an upper end port of each oil return channel 3 is located on the bottom surface of the valve chamber 11, an upper end port of each air return channel 4 is higher than an upper end port of each oil return channel 3 and is located in the middle of the valve chamber 11 in the height.

Specifically, as shown in fig. 5 and 6, the two oil return channels 3 are respectively located at two lateral sides of the cylinder head 1, and lower ends of the two oil return channels 3 are respectively communicated with two ends of the main oil gallery 2, wherein a lower end of the oil return channel 3 away from the chain cavity 12 is directly communicated with the oil outlet 5, and the two air return channels 4 are located between the two oil return channels 3. The two air return channels 4 are located between the two air exhaust channels 13, the two air return channels 4 are respectively close to the two air exhaust channels 13, the two air exhaust channels 13 are located between the two oil return channels 3, and the two oil return channels 3 are respectively close to the two air exhaust channels 13. The oil return channel 3 and the air return channel 4 are both straight, the oil return channel 3 and the air return channel 4 are both obliquely arranged relative to the bottom surface of the cylinder head 1, the inclination of the oil return channel 3 is greater than that of the air return channel 4, the length of the oil return channel 3 is less than that of the air return channel 4, the passing sectional areas of the oil return channel 3 and the air return channel 4 are both smaller than that of the main oil duct 2, the sum of the passing sectional areas of the main oil duct 2 and the oil return channel 3 is smaller than that of the oil outlet 5, and the passing sectional area of the oil return channel 3 is greater than that of the air return channel 4.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms cylinder head 1, valve chamber 11, chain cavity 12, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The utility model provides an oil return structure of motorcycle engine, the engine includes cylinder head (1), valve chamber (11) have in cylinder head (1), oil return structure is including offering main oil duct (2) in cylinder head (1) bottom and being used for the intercommunication crankcase, its characterized in that, oil return channel (3) and return-air passageway (4) have still been seted up from top to bottom on cylinder head (1), the lower extreme of oil return channel (3) and return-air passageway (4) all is linked together with main oil duct (2), the upper end port of oil return channel (3) is located the bottom surface of valve chamber (11), the upper end port of return-air passageway (4) is higher than the upper end port of oil return channel (3) and is located the middle part of valve chamber (11) direction of height.

2. The oil return structure of the motorcycle engine according to claim 1, wherein one lateral side of the cylinder head (1) is provided with a chain cavity (12), the bottom of the other lateral side is provided with an oil outlet (5) for communicating with a crankcase, the main oil gallery (2) is transversely arranged, one end of the main oil gallery (2) is communicated with the chain cavity (12), the other end of the main oil gallery is communicated with the oil outlet (5), the oil return channel (3) is communicated with the end of the main oil gallery (2), and the air return channel (4) is communicated with the middle of the main oil gallery (2).

3. An oil return structure of a motorcycle engine according to claim 2, wherein there are two oil return passages (3) and two air return passages (4), the two oil return passages (3) are respectively located at both lateral sides of the cylinder head (1), lower ends of the two oil return passages (3) are respectively communicated with both ends of the main oil gallery (2), and the two air return passages (4) are located between the two oil return passages (3).

4. A motorcycle engine oil return structure according to claim 3, wherein a lower end of one of the oil return passages (3) communicates with the oil outlet port (5).

5. An oil return structure of a motorcycle engine according to claim 2, 3 or 4, wherein the cylinder head (1) has a bottom surface for fitting with a top surface of a cylinder block, the oil return passage (3) and the air return passage (4) are straight, the oil return passage (3) and the air return passage (4) are both inclined with respect to the bottom surface of the cylinder head (1), the inclination of the oil return passage (3) is greater than that of the air return passage (4), and the length of the oil return passage (3) is less than that of the air return passage (4).

6. An oil return structure of a motorcycle engine according to claim 2, 3 or 4, characterized in that the passage sectional area of the oil return passage (3) and the air return passage (4) are each smaller than the passage sectional area of the main oil gallery (2), and the passage sectional area of the oil return passage (3) is larger than the passage sectional area of the air return passage (4).

7. An oil return structure of a motorcycle engine according to claim 3 or 4, wherein the cylinder head (1) is provided with two exhaust passages (13) arranged in the transverse direction, the main oil gallery (2) is located below the two exhaust passages (13), the two return passages (4) are located between the two exhaust passages (13), the two return passages (4) are respectively close to the two exhaust passages (13), the two exhaust passages (13) are respectively located between the two return passages (3), and the two return passages (3) are respectively close to the two exhaust passages (13).

8. An oil return structure of a motorcycle engine as set forth in claim 7, wherein the valve chamber (11) has an inwardly projecting mounting portion (14) on an inner wall thereof, the exhaust passage (13) is provided inside the mounting portion (14), and the two return passages (4) are provided on the mounting portion (14).

9. The oil return structure of a motorcycle engine according to claim 1, 2, 3 or 4, characterized in that one end of the main oil gallery (2) far away from the chain chamber (12) penetrates onto the side wall of the cylinder head (1), and the port of one end of the main oil gallery (2) far away from the chain chamber (12) is blocked by a plug (6).