Crankcase ventilation structure of pedal motorcycle

Abstract

The utility model discloses a crankcase ventilation structure of a pedal motorcycle. The crankcase ventilation structure comprises a cylinder head cover, an air filter assembly, a three-way breathing pipe and a condensate water collecting pipe which are arranged on an engine, the cylinder head cover is provided with a first labyrinth in a sealed mode, the first labyrinth is provided with a first inlet and a first outlet, the air filter assembly is provided with a second labyrinth in a sealed mode, the second labyrinth is provided with a second inlet and a second outlet, a waste gas port of the crankcase is communicated with the first inlet, and the first outlet is communicated with the second inlet and a condensate water collecting pipe through a three-way breathing pipe. The second outlet communicates with an engine combustion chamber; the three-way breathing tube is arranged at the lowest position of the engine, and the first labyrinth and the second labyrinth are higher than the three-way breathing tube in position. Waste gas in the crankcase is separated twice through the first labyrinth and the second labyrinth, and the oil-gas separation effect can be effectively improved. Condensate water can be collected and effectively prevented from flowing back to an engine, and therefore normal work of the engine is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of scooter engine, especially point to a kind of scooter crankcase ventilation structure. BACKGROUND

[0002] In the operation process of motorcycle engine, the high-pressure combustible mixture and the burned gas in combustion chamber inevitably leak into the crankcase through the gap between cylinder and piston assembly, which is called blow-by phenomenon. The composition of blow-by is complex, including unburned gas, burned gas and water vapor, etc. When these mixed gases blow into the crankcase, the excessive water vapor condensation will seriously interfere with the normal energy efficiency of engine oil. Worse still, the reaction of sulfur dioxide in exhaust gas with water vapor will form sulfurous acid, which will be converted into sulfuric acid under the action of oxygen, and carbon monoxide (CO) and nitrogen oxides (NO) in exhaust gas are also easy to be converted into other acidic substances. If these acidic substances cannot be discharged in time, they will erode and damage the engine parts.

[0003] In addition, with the continuous operation of the engine, the temperature inside the crankcase rises significantly, causing the gas to expand, and the continuously blowing high-temperature and high-pressure gas makes the pressure in the crankcase increase sharply. This not only damages the sealing of the engine and causes oil leakage, but also increases the resistance of the piston during the downward process, thereby weakening the output power of the engine. Therefore, in order to ensure the normal operation of the motorcycle engine, an effective exhaust device must be provided to discharge the gas in the crankcase in time.

[0004] In order to effectively discharge the gas inside the engine, the prior art usually provides an exhaust port on the crankcase or cylinder head, and an oil-gas separator is connected outside. The core function of the separator is to efficiently separate the oil and vapor in the oil-gas discharged from the crankcase. As shown in Figure 1 The common oil-gas separation device is shown in the figure. When the oil-gas below the combustion chamber blows into the crankcase and mixes with the engine oil, the gas will carry a certain amount of engine oil vapor. Then, these mixed gases flow through the oil-gas vent pipe 1' to the oil-gas separator 2', the oil film will flow into the engine oil recovery pipe 3' along the pipe wall, and the separated vapor will pass through the vapor recovery pipe 4', the air filter exhaust pipe 5', the throttle body 6', the intake manifold 7' in turn, and finally return to the combustion chamber of the cylinder head 8' for re-combustion, avoiding the direct discharge of oil-gas from the crankcase to the atmosphere, realizing the full recovery and utilization of oil-gas.

[0005] However, the existing way of adopting the external oil-gas separator makes the pipeline configuration of the engine more complex and occupies more space. If the user rides for a short distance at low temperature, the pipeline between the oil-gas separator and the engine body is prone to form condensed water when the overall temperature of the engine has not reached the normal working temperature, and the condensed water in the pipeline is prone to flow back to the engine after the engine stops, thereby affecting normal use. Utility model content

[0006] The utility model discloses a kind of scooter crankcase ventilation structures, waste gas in crankcase can be oil-gas separation, avoid the condensed water backflow in riding process to engine.

[0007] To achieve the above purpose, the utility model's solution is: a kind of scooter crankcase ventilation structure, including the cylinder head cover assembly being arranged on engine, air filter assembly, three-way breathing pipe and condensed water collection pipe;

[0008] The cylinder head cover assembly is provided with first maze, the first maze is provided with first inlet and first outlet, the air filter assembly is provided with second maze, the second maze is provided with second inlet and second outlet, the waste gas port of crankcase is communicated with first inlet, first outlet is communicated with second inlet and condensed water collection pipe respectively by three-way breathing pipe, and second outlet is communicated with engine combustion chamber;

[0009] Three-way breathing pipe is arranged at the lowest position of engine, and the positions of first maze and second maze are higher than the position of three-way breathing pipe.

[0010] Preferably, the first maze includes a plurality of partitions and a cover plate, the plurality of partitions are arranged in the inner wall of the cylinder head cover to form a zigzag channel, and the cover plate is arranged on the partitions, the first inlet is arranged on the partition at the bottom of the first maze, and the first outlet is arranged on the cylinder head cover at the top of the first maze.

[0011] Preferably, the utility model further includes a sealing gasket, and the sealing gasket is arranged between the partitions and the cover plate.

[0012] Preferably, the utility model further includes a first oil return port, and the first oil return port is arranged on the partition at the bottom of the first maze, and the first oil return port is communicated with the oil pan of the crankcase.

[0013] Preferably, the air filter assembly is provided with a containing cavity inside, the inner wall of the containing cavity is convex to form a blocking cavity, the second outlet is arranged on the blocking cavity and communicated with the containing cavity, and the air filter assembly is provided with the second inlet at a position matched with the blocking cavity.

[0014] Preferably, the utility model further includes a waste gas recovery port, and the waste gas recovery port is arranged in the containing cavity of the air filter assembly, and the waste gas recovery port is communicated with the second outlet and the engine combustion chamber respectively.

[0015] Preferably, the second oil return port is provided on the air filter assembly and communicates with the accommodating cavity, and the second oil return port communicates with the oil collecting pipe.

[0016] Preferably, the three-way breathing pipe is in the shape of T, and the three-way breathing pipe is provided with a left interface, a right interface and a lower interface.

[0017] Preferably, the three-way breathing pipe is in the shape of T, and the three-way breathing pipe is provided with a left interface, a right interface and a lower interface.

[0018] With the above scheme, the beneficial effects of the present application are as follows: the waste gas in the crankcase is separated twice by the first labyrinth and the second labyrinth, which can effectively improve the oil-gas separation effect. In addition, since the three-way breathing pipe is arranged at the lowest position of the engine, and the positions of the first labyrinth and the second labyrinth are higher than that of the three-way breathing pipe, and the three-way breathing pipe is connected with the condensed water collecting pipe, the condensed water can be collected, and the backflow of the condensed water from the first outlet to the three-way breathing pipe and from the second inlet to the three-way breathing pipe can be effectively avoided, thereby ensuring the normal operation of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of an existing oil-gas separation device installed on an engine;

[0020] Figure 2 is a schematic view of the installation of the crankcase ventilation structure in the embodiment of the present application;

[0021] Figure 3 is a schematic view of the first labyrinth arranged on the cylinder head cover in the embodiment of the present application;

[0022] Figure 4 is a schematic view of the cover plate and the sealing gasket arranged on the first labyrinth of the cylinder head cover in the embodiment of the present application;

[0023] Figure 5 is a schematic view of the second labyrinth arranged in the accommodating cavity of the air filter assembly in the embodiment of the present application;

[0024] Figure 6 is Figure 5 is an enlarged structural schematic view of position A in FIG. 8;

[0025] Figure 7It is the schematic view of the first outlet and the second inlet through the first breathing pipe and the second breathing pipe and connecting with the three-way breathing pipe and installing the condensed water collecting pipe in the three-way breathing pipe in the embodiment of the utility model.

[0026] Label explanation:

[0027] 1, cylinder head cover; 11, first labyrinth; 12, first inlet; 13, first outlet; 14, partition; 15, cover plate; 16, tortuous passage; 17, sealing gasket; 18, first oil return port;

[0028] 2, air filter assembly; 21, second labyrinth; 22, second inlet; 23, second outlet; 24, containing cavity; 25, blocking cavity; 26, exhaust gas recovery port; 27, second oil return port; 28, oil collecting pipe;

[0029] 3, three-way breathing pipe; 31, left interface; 32, right interface; 33, lower interface;

[0030] 4, condensed water collecting pipe; 5, first breathing pipe; 6, second breathing pipe. Specific embodiment

[0031] The utility model will be further explained in connection with the drawings and specific embodiment.

[0032] The embodiment provides a kind of pedal motorcycle crankcase ventilation structure, as shown in figure, including the cylinder head cover 1 assembly of being arranged on engine, air filter assembly 2, three-way breathing pipe 3 and condensed water collecting pipe 4; Figures 2 to 7

[0033] Cylinder head cover 1 assembly is equipped with first labyrinth 11, and first labyrinth 11 is equipped with first inlet 12 and first outlet 13, and air filter assembly 2 is equipped with second labyrinth 21, and second labyrinth 21 is equipped with second inlet 22 and second outlet 23, and the exhaust port of crankcase is communicated with first inlet 12, and first outlet 13 is communicated with second inlet 22 and condensed water collecting pipe 4 respectively by three-way breathing pipe 3, and second outlet 23 is communicated with engine combustion chamber;

[0034] Three-way breathing pipe 3 is arranged at the lowest position of engine, and the position of first labyrinth 11 and second labyrinth 21 is higher than the position of three-way breathing pipe 3.

[0035] The exhaust gas of the embodiment of crankcase enters three-way breathing pipe 3 after first oil-gas separation of first labyrinth 11, and finally enters the combustion chamber of engine for secondary combustion after second oil-gas separation of second labyrinth 21. This process reduces the pressure in the crankcase, fully utilizes the combustible components in the exhaust gas, and improves the combustion efficiency of the engine.

[0036] ​In addition, the three-way breathing pipe 3 of the embodiment is arranged at the lowest position of the engine, which is conducive to the collection of condensed water. The condensed water is discharged through the condensed water collection pipe 4, preventing the backflow of the condensed water into the engine, thereby avoiding the problems of oil dilution and corrosion caused by the condensed water, improving the stability and operating efficiency of the engine, and prolonging the service life of the engine. Since the embodiment does not need to be provided with an additional oil-gas separation device, the entire structure is more compact.

[0037] As shown in Figure 3 , the first labyrinth 11 includes baffles 14 and cover plates 15. The baffles 14 are arranged on the inner wall of the cylinder head cover 1 to form a tortuous channel 16, and the cover plates 15 are arranged on the baffles 14. The first inlet 12 is arranged on the baffle 14 at the bottom of the first labyrinth 11, and the first outlet 13 is arranged on the cylinder head cover 1 at the top of the first labyrinth 11.

[0038] The baffles 14 of the embodiment form a tortuous channel 16 on the inner wall of the cylinder head cover 1, and the first inlet 12 is arranged on the baffle 14 at the bottom of the first labyrinth 11, and the first outlet 13 is arranged on the cylinder head cover 1 at the top of the first labyrinth 11. This increases the flow path and residence time of the exhaust gas when passing through the first labyrinth 11, which helps to more fully separate the oil vapor and other impurities in the exhaust gas, improving the efficiency of oil-gas separation.

[0039] As shown in Figure 4 , a sealing gasket 17 is further arranged between the baffles 14 and the cover plates 15. The sealing gasket 17 is arranged between the baffles 14 and the cover plates 15, which can ensure the sealing of the first labyrinth 11 and ensure the stable operation of the oil-gas separation.

[0040] As shown in Figure 3 , a first oil return port 18 is further arranged on the baffle 14 at the bottom of the first labyrinth 11, and the first oil return port 18 is in communication with the oil pan of the crankcase.

[0041] The first oil return port 18 of the embodiment is used to recover the engine oil after the first oil-gas separation, which is conducive to improving the use efficiency of the engine oil and saving the use cost of the engine oil.

[0042] As shown in Figure 5 and Figure 6 , the air filter assembly 2 is internally provided with a containing cavity 24, and the inner wall of the containing cavity 24 is convexly formed into a blocking cavity 25. The second outlet 23 is arranged on the blocking cavity 25 and is in communication with the containing cavity 24. The air filter assembly 2 is provided with a second inlet 22 at a position matched with the blocking cavity 25.

[0043] The blocking cavity 25 protruding from the inner wall of the accommodating cavity 24 of the air filter assembly 2 forms the second labyrinth; 21, which can continue to separate the exhaust gas for the second time after the first oil-gas separation of the first labyrinth 11, thereby improving the separation efficiency. Of course, in other embodiments, the second labyrinth; 21 can also be arranged in the same structure as the first labyrinth 11.

[0044] As Figure 5 shown, it also includes a waste gas recovery port 26, which is arranged in the accommodating cavity 24 of the air filter assembly 2, and the waste gas recovery port 26 is in communication with the second outlet 23 and the engine combustion chamber respectively.

[0045] The waste gas recovery port 26 of the embodiment can recover part of the exhaust gas from the accommodating cavity 24 of the air filter assembly 2 and re-introduce it into the engine combustion chamber for reburning, thereby improving the combustion efficiency of the engine, reducing the emission of unburned exhaust gas, and reducing the content of harmful substances, thereby improving the emission quality of the engine.

[0046] As Figure 5 shown, it also includes a second oil return port 27 and an oil collection pipe 28, the second oil return port 27 is arranged on the air filter assembly 2 and in communication with the accommodating cavity 24, and the second oil return port 27 is in communication with the oil collection pipe 28.

[0047] The second oil return port 27 of the embodiment cooperates with the oil collection pipe 28 to recover the oil after the second oil-gas separation, which is beneficial to improve the use efficiency of the oil and save the use cost of the oil.

[0048] As Figure 7 shown, the three-way breathing pipe 3 of the embodiment is in the shape of T, and the three-way breathing pipe 3 is provided with a left interface 31, a right interface 32 and a lower interface 33, so that the structure after installation is more compact and the installation process is more convenient

[0049] As Figure 7 shown, it also includes a first breathing pipe 5 and a second breathing pipe 6, one end of the first breathing pipe 5 is connected to the first outlet 13 of the first labyrinth 11, and the other end of the first breathing pipe 5 is connected to the left interface 31 of the three-way breathing pipe 3; one end of the second breathing pipe 6 is connected to the second inlet 22 of the second labyrinth; 21, and the other end of the second breathing pipe 6 is connected to the right interface 32 of the three-way breathing pipe 3; the condensate water collection pipe 4 is connected to the lower interface 33 of the three-way breathing pipe 3.

[0050] The three-way breathing pipe 3 is arranged at the lowest position of the engine, the height of the first outlet 13 and the second inlet 22 is higher than the height of the three-way breathing pipe 3, and the first breathing pipe 5 and the second breathing pipe 6 are both curved. When the user rides for a short distance at a low temperature, the first breathing pipe 5 and the second breathing pipe 6 are prone to produce condensed water at this time, and the overall temperature of the engine has not reached the normal working temperature. The condensed water in the first breathing pipe 5 and the second breathing pipe 6 can be discharged through the condensed water collecting pipe 4 at the lower interface 33 of the three-way breathing pipe 3 after the engine stops, so that the condensed water is prevented from flowing back into the engine, the structure is simple, and the stability and operation efficiency of the engine are improved.

[0051] The orientation terms mentioned in the specification are defined with respect to the structure shown in the drawings, and they are relative concepts, so it is possible to change accordingly according to different positions and different use states. Therefore, these or other orientation terms should not be interpreted as limiting terms.

[0052] The above only describes the preferred embodiment of the present application, and is not a limitation on the design of the present application. Any equivalent changes made according to the key design of the present application shall fall within the scope of protection of the present application.

Claims

1. Scooter crankcase ventilation arrangement, characterized in that: The cylinder head cover assembly, the air filter assembly, the three-way breathing pipe and the condensed water collecting pipe are arranged on the engine; The cylinder head cover assembly is provided with a first labyrinth, the first labyrinth is provided with a first inlet and a first outlet, the air filter assembly is provided with a second labyrinth, the second labyrinth is provided with a second inlet and a second outlet, the exhaust port of the crankcase is communicated with the first inlet, the first outlet is communicated with the second inlet and the condensed water collecting pipe through the three-way breathing pipe, and the second outlet is communicated with the engine combustion chamber. The three-way breathing pipe is arranged at the lowest position of the engine, and the positions of the first labyrinth and the second labyrinth are higher than that of the three-way breathing pipe.

2. Scooter crankcase ventilation structure according to claim 1, characterized in that: The first labyrinth comprises a plurality of partitions and a cover plate, the partitions are arranged on the inner wall of the cylinder head cover to form a zigzag channel, and the cover plate is arranged on the partitions.

3. Scooter crankcase ventilation structure according to claim 2, characterized in that: The sealing gasket is arranged between the partitions and the cover plate.

4. Scooter crankcase ventilation structure according to claim 2, characterized in that: The first oil return port is arranged on the partition at the bottom of the first labyrinth, and the first oil return port is communicated with the oil pan of the crankcase.

5. Scooter crankcase ventilation structure according to claim 1, characterized in that: The air filter assembly is internally provided with a containing cavity, the inner wall of the containing cavity is protruded to form a blocking cavity, the second outlet is arranged on the blocking cavity and communicated with the containing cavity, and the air filter assembly is provided with the second inlet at a position matched with the blocking cavity.

6. Scooter crankcase ventilation structure according to claim 5, characterized in that: The exhaust gas recovery port is arranged in the containing cavity of the air filter assembly, and the exhaust gas recovery port is communicated with the second outlet and the engine combustion chamber.

7. Scooter crankcase ventilation structure according to claim 5, characterized in that: The second oil return port is arranged on the air filter assembly and communicated with the containing cavity, and the second oil return port is communicated with the oil collecting pipe.

8. A scooter crankcase ventilation arrangement as claimed in claim 1, characterized in that: The three-way breathing pipe is in T shape, and the three-way breathing pipe is provided with a left interface, a right interface and a lower interface.

9. Scooter crankcase ventilation structure according to claim 8, characterized in that: The first breathing pipe is connected with the first outlet of the first labyrinth at one end and connected with the left interface of the three-way breathing pipe at the other end. The second breathing pipe is connected with the second inlet of the second labyrinth at one end and connected with the right interface of the three-way breathing pipe at the other end. The condensed water collecting pipe is connected with the lower interface of the three-way breathing pipe.

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