Crankcase ventilation system

Abstract

The crankcase ventilation system is characterized in that the bottom and one side of a cylinder cover are respectively connected with a cylinder body and an intake manifold in a matched mode, an oil-gas separator is integrated in a cylinder cover assembly, the air outlet side, matched with the oil-gas separator, of the cylinder cover assembly is respectively provided with a first air outlet channel and a second air outlet channel, and an oil return cover plate is arranged at the bottom of the cylinder cover assembly; the oil return cover plate is matched with the bottom of the cylinder cover cap assembly to form an oil return cavity, the oil return cavity is communicated with the oil outlet side of the oil-gas separator, the oil return cover plate is provided with an inclined face, an oil outlet is formed in the lowest horizontal point of the inclined face, and one end of the first air outlet channel and one end of the second air outlet channel are connected with a large-load ventilation pipe and a partial-load ventilation pipe respectively. A valve block used for opening and closing is arranged in the second air outlet channel, the other end of the large-load ventilation pipe is communicated with a whole vehicle air filter, and the other end of the partial-load ventilation pipe is communicated with an air inlet manifold. The cylinder head cover is integrated with the oil-gas separation structure, and various oil-gas separation structures are adopted, so that the requirement for large-inclination installation of the engine can be met.

Description

Technical Field

[0001] This utility model relates to the field of automotive engine technology, specifically to a crankcase ventilation system. Background Technology

[0002] During engine operation, combustion exhaust gases and unburned mixtures generated inside the cylinder liner inevitably enter the crankcase through the gaps between the piston and piston rings, between the piston rings and cylinder liner, valve stem seals, and valve guides. Over time, this causes increased pressure within the crankcase, making the engine prone to leaks. Furthermore, if the exhaust gases in the crankcase cannot be expelled in time, these gases react chemically with the engine oil, causing the oil to deteriorate and produce sludge, which adversely affects engine components and the friction pairs of the lubrication system. If the gases from the crankcase are directly released into the atmosphere, it will pollute the environment.

[0003] To address these issues, a crankcase ventilation system was introduced into the engine. Its working principle is to use the vacuum of the intake system to draw exhaust gas from the crankcase into the oil-gas separator for oil-gas separation. The separated gas then enters the combustion chamber for re-combustion, while the separated oil returns to the oil pan through the oil return hole. In this way, the gas in the crankcase is promptly introduced into the intake system for re-combustion, thereby solving the problems of emissions and leaks caused by exhaust gas in the crankcase, as well as corrosion to the engine.

[0004] The existing crankcase ventilation systems on the market have the following problems: (1) poor oil-gas separation effect and insufficient oil-gas separation; (2) the use of an external oil-gas separator, which requires a large overall layout space; (3) the crankcase is suitable for engines with a small tilt angle; (4) the crankcase air supply structure is integrated into the oil-gas separation structure, which has poor adaptability when installed on different models. Utility Model Content

[0005] In view of the above-mentioned technical problems of existing ventilation systems, the purpose of this utility model is to provide a crankcase ventilation system that integrates an oil-gas separation structure with a cylinder head cover and adopts a variety of oil-gas separation structures to meet the requirements of large-tilt installation of the engine.

[0006] To achieve the above objectives, the present invention provides a crankcase ventilation system including a cylinder head cover assembly, an air injection pipe assembly, and an oil return valve. The cylinder head cover assembly is installed on the top of the cylinder head. The bottom and one side of the cylinder head are respectively connected to a cylinder block and an intake manifold. The cylinder block is used to connect to the crankcase, and the intake manifold is connected to the intake passage on the cylinder head.

[0007] The cylinder head cover assembly integrates an oil-gas separator for separating oil and gas in the crankcase. The cylinder head cover assembly has a first exhaust channel and a second exhaust channel on the exhaust side that cooperates with the oil-gas separator. The bottom of the cylinder head cover assembly has an oil return cover plate, which cooperates with the bottom of the cylinder head cover assembly to form an oil return chamber. The oil return chamber is connected to the oil outlet side of the oil-gas separator. The oil return cover plate has an inclined surface and an oil outlet is located at the lowest horizontal point of the inclined surface. The oil outlet is connected to the oil return channel of the cylinder head.

[0008] The first air outlet channel and the second air outlet channel are respectively connected to a high-load ventilation pipe and a partial-load ventilation pipe at one end. The first air outlet channel and the second air outlet channel are equipped with valve plates for opening and closing. The other end of the high-load ventilation pipe is connected to the vehicle air filter, and the other end of the partial-load ventilation pipe is connected to the intake manifold.

[0009] When the pressure inside the crankcase is greater than the pressure in the vehicle's air filter pipeline, the valve in the first outlet passage opens; when the pressure inside the crankcase is greater than the pressure in the intake manifold, the valve in the second outlet passage opens.

[0010] The air supply pipe assembly is installed on the cylinder block, with one end connected to the vehicle's air filter and the other end extending into the crankcase for supplying air to the crankcase.

[0011] The return valve is installed on the return oil hole at the bottom of the cylinder block.

[0012] Furthermore, the cylinder head cover assembly includes a cylinder head cover body, an oil-gas separator, and a vent pipe connection.

[0013] The cylinder head cover body has an internal cavity, in which an oil-gas separator is disposed, and the cavity is connected to the outlet side of the oil-gas separator.

[0014] The vent pipe connector is located on the top of the cylinder head cover body. The vent pipe connector has a second cavity and a third cavity inside, and valve plates are respectively installed between the second cavity and the third cavity.

[0015] The gas separated by the oil-gas separator flows into the cavity, and then flows through the valve plate into the second and third cavities in the vent pipe connection.

[0016] The vent pipe connection is provided with a first vent and a second vent. One end of the first vent is connected to the high-load ventilation pipe, and the other end of the first vent is connected to the second cavity to form a first vent channel. One end of the second vent is connected to the partial-load ventilation pipe, and the other end is connected to the second cavity to form a second vent channel. The bottom of the cylinder head cover body is connected to the oil return cover plate.

[0017] Furthermore, the valve in the first air outlet channel is a breathing valve.

[0018] Furthermore, the valve plate in the second air outlet channel is a metal valve plate.

[0019] Furthermore, the air injection pipe assembly includes an air injection pipe and an air injection check valve. The air injection pipe is installed on the cylinder block, with one end connected to the vehicle air filter and the other end equipped with an air injection check valve extending into the crankcase.

[0020] Furthermore, the return valve is a one-way valve.

[0021] This solution adopts an integrated oil-gas separator inside the cylinder head cover assembly, which can reduce the overall layout structure. It also uses an external air supply pipe assembly on the oil-gas separator, which separates the two and makes it highly adaptable to different vehicle models.

[0022] Furthermore, the oil return cover is designed with an inclined surface, and the oil return port is located at the lowest point of the inclined surface. This is suitable for engines with large tilt angles and ensures that the oil return port is at the lowest position of the oil return cover when the engine is at a large tilt angle, thus avoiding oil accumulation, which would lead to poor oil return and affect the oil-gas separation effect.

[0023] Compared with the prior art, the crankcase ventilation system provided by this utility model has the following beneficial effects:

[0024] (1) Compact structure;

[0025] (2) Excellent oil-gas separation effect;

[0026] (3) It can be arranged at a wide angle;

[0027] (4) It has strong adaptability in terms of equipment and layout. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 A schematic diagram illustrating the actual application of the crankcase ventilation system provided by this utility model;

[0030] Figure 2 A schematic diagram of the overall structure of the crankcase ventilation system provided by this utility model;

[0031] Figure 3 A schematic diagram of the cylinder head cover assembly in the crankcase ventilation system provided by this utility model.

[0032] Illustration:

[0033] Cylinder head cover assembly 100, air intake pipe assembly 200, oil return valve 300, cylinder head 400, cylinder block 500, intake manifold 600.

[0034] First air outlet 101, second air outlet 102, oil outlet 103, high-load ventilation pipe 104, partial-load ventilation pipe 105, cylinder head cover body 110, cavity 111, oil-gas separator 120, vent pipe connection 130, oil return cover plate 140, oil return chamber 141, valve plate 150, air supply pipe 210, air supply check valve 220. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0036] See Figures 1-3 The diagram shown is a structural schematic of the crankcase ventilation system provided by this utility model.

[0037] As shown in the figure, the crankcase ventilation system provided by this utility model includes three components: cylinder head cover assembly 100, air supply pipe assembly 200, and oil return valve 300.

[0038] Among them, the cylinder head cover assembly 100 is installed on the top of the cylinder head 400, and the cylinder block 500 and the intake manifold 600 are respectively connected to the bottom and one side of the cylinder head 400. The cylinder block 500 is used to connect to the crankcase, and the intake manifold 600 is connected to the intake passage on the cylinder head 400.

[0039] The cylinder head cover assembly 100 integrates an oil-gas separator 120 for separating oil and gas in the crankcase. The cylinder head cover assembly 100 and the oil-gas separator 120 are respectively provided with a first exhaust channel and a second exhaust channel on the exhaust side. The bottom of the cylinder head cover assembly 100 is provided with an oil return cover plate 140. The oil return cover plate 140 and the bottom of the cylinder head cover assembly 100 cooperate to form an oil return chamber 141. The oil return chamber 141 communicates with the oil outlet side of the oil-gas separator 120. The oil return cover plate 140 is provided with an inclined surface and an oil outlet 103 is provided at the lowest horizontal point of the inclined surface. The oil outlet 103 communicates with the oil return channel of the cylinder head 400.

[0040] The first and second air outlet passages are respectively connected at one end to a high-load ventilation pipe 104 and a partial-load ventilation pipe 105. Both passages are equipped with valve plates 150 for opening and closing. The other end of the high-load ventilation pipe 104 is connected to the vehicle's air filter, and the other end of the partial-load ventilation pipe 105 is connected to the intake manifold 600.

[0041] When the pressure inside the crankcase is greater than the pressure in the vehicle's air filter pipeline, the valve plate 150 in the first outlet passage opens; when the pressure inside the crankcase is greater than the pressure inside the intake manifold 600, the valve plate 150 in the second outlet passage opens.

[0042] The air supply pipe assembly 200 is installed on the cylinder block 500, with one end connected to the vehicle air filter and the other end extending into the crankcase for supplying air to the crankcase.

[0043] The oil return valve 300 is installed on the oil return hole at the bottom of the cylinder block 500.

[0044] Compared with existing technologies, this solution adopts an internally integrated oil-gas separator 120 in the cylinder head cover assembly 100, which can reduce the overall layout structure. It also adopts an externally placed air supply pipe assembly 200 in the oil-gas separator 120, which separates the two and makes it highly adaptable when installed in different vehicle models.

[0045] Furthermore, in this design, the oil return cover 140 is designed with an inclined surface, and the oil return port 103 is located at the lowest horizontal point of the inclined surface. This is suitable for engines with large tilt angles and ensures that the oil return port 103 is at the lowest position of the oil return cover 140 when the engine has a large tilt angle, thus avoiding oil accumulation, which would lead to poor oil return and affect the oil-gas separation effect.

[0046] In practical applications, the oil-air mixture in the crankcase enters the cylinder head cover assembly 100 for oil-air separation. The separated oil flows through the oil outlet 103 on the oil return cover 140, through the oil return channels in the cylinder head 400 and cylinder block 500, and finally flows into the oil pan through the oil return valve 300.

[0047] During the high-speed, high-load stage of the engine, the engine turbocharger is working, and a vacuum is formed in the air filter intake pipe of the vehicle. The pressure in the crankcase is greater than the pressure in the air filter intake pipe of the vehicle. The valve plate 150 in the first exhaust passage connected to the high-load ventilation pipe 104 opens and forms a passage. The oil and gas will enter the air filter of the vehicle through the high-load ventilation pipe 104 and enter the intake manifold 600 together with fresh air and then enter the cylinder head 400 for combustion.

[0048] During the low-speed, low-load phase of the engine, the piston descends and generates negative pressure suction on the intake manifold 600. The pressure inside the crankcase is greater than the pressure inside the intake manifold 600. The valve plate 150 in the second exhaust passage connected to the partial load ventilation pipe 105 opens and forms a passage. The separated gas enters the intake manifold 600 directly through the partial load ventilation pipe 105 and enters the cylinder head 400 for combustion along with fresh air.

[0049] Specifically, such as Figure 3 The cylinder head cover assembly 100 includes a cylinder head cover body 110, an oil-gas separator 120, and a vent pipe connection 130.

[0050] The cylinder head cover body 110 has an internal cavity 111, in which the oil-gas separator 120 is disposed, and the cavity 111 communicates with the outlet side of the oil-gas separator 120.

[0051] A vent pipe connector 130 is disposed on the top of the cylinder head cover body 110. The vent pipe connector 130 has a second cavity and a third cavity inside, and valve plates 150 are respectively provided between the second cavity and the third cavity and the cavity 111.

[0052] The gas separated by the oil-gas separator 120 flows into cavity 111, and then through valve plate 150 flows into the second and third cavities in the vent pipe connection 130.

[0053] The ventilation pipe connection 130 is provided with a first air outlet 101 and a second air outlet 102. One end of the first air outlet 101 is connected to the high-load ventilation pipe 104, and the other end of the first air outlet 101 is connected to the second cavity to form a first air outlet channel. One end of the second air outlet 102 is connected to the partial-load ventilation pipe 105, and the other end is connected to the second cavity to form a second air outlet channel.

[0054] The bottom of the cylinder head cover body 110 is connected to the oil return cover plate 140 to form an oil return chamber 141.

[0055] Based on the above structure, the oil separated by the oil-gas separator is discharged from the oil outlet side and falls into the oil return chamber 141. Finally, it flows from the oil outlet 103 into the oil return channel in the cylinder head 400. At full speed and full load, the gas separated by the oil-gas separator 120 is discharged from the exhaust side and passes through the cavity 111 in sequence. The second cavity finally flows into the high-load ventilation pipe 104 through the first air outlet 101. At partial load, the gas separated by the oil-gas separator 120 is discharged from the exhaust side and passes through the cavity 111 and the third cavity in sequence. Finally, it flows into the partial-load ventilation pipe 105 through the second air outlet 102.

[0056] Furthermore, the valve plate 150 in the first air outlet channel is preferably a breather valve plate, and the valve plate 150 in the second air outlet channel is preferably a metal valve plate.

[0057] The air injection pipe assembly 200 includes an air injection pipe 210 and an air injection check valve 220. The air injection pipe 210 is mounted on the cylinder block 500, with one end connected to the vehicle's air filter and the other end equipped with the air injection check valve 220 and extending into the crankcase.

[0058] The aforementioned air supply pipe assembly 200 is used to supply air to the crankcase through the air supply pipe 210 when the air pressure in the crankcase is lower than the pressure in the intake pipe after the air filter of the vehicle during engine operation, thereby adjusting the crankcase pressure. When the crankcase pressure is greater than the pressure in the intake pipe after the air filter of the vehicle, the air supply check valve 220 closes to prevent oil and gas in the crankcase from directly entering the intake pipe after the air filter of the vehicle through the air supply pipe 210 and then entering the cylinder head 400 for combustion, thus avoiding oil burning.

[0059] Furthermore, the oil return valve 300 is a one-way valve, which is installed on the oil return hole at the bottom of the cylinder block 500. The oil and gas in the crankcase are separated by oil and gas separation, and then pass through the oil outlet 103 on the oil return cover plate 140, and through the oil return passage in the cylinder head 400 and the cylinder block 500, and finally return to the oil pan through the oil return valve 300. The oil return valve 300 is a one-way valve, which can prevent the piston from compressing the crankcase pressure gas during the working stroke and causing the oil in the oil pan to flow back through the oil return passage, thus preventing the oil and gas separation from failing.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A crankcase ventilation system, characterized in that, Includes a cylinder head cover assembly, an air intake pipe assembly, and an oil return valve. The cylinder head cover assembly is installed on the top of the cylinder head. The bottom and one side of the cylinder head are respectively connected to the cylinder block and the intake manifold. The cylinder block is used to connect to the crankcase, and the intake manifold is connected to the intake passage on the cylinder head. The cylinder head cover assembly integrates an oil-gas separator for separating oil and gas in the crankcase. The cylinder head cover assembly has a first exhaust channel and a second exhaust channel on the exhaust side that cooperates with the oil-gas separator. The bottom of the cylinder head cover assembly has an oil return cover plate, which cooperates with the bottom of the cylinder head cover assembly to form an oil return chamber. The oil return chamber is connected to the oil outlet side of the oil-gas separator. The oil return cover plate has an inclined surface and an oil outlet is located at the lowest horizontal point of the inclined surface. The oil outlet is connected to the oil return channel of the cylinder head. The first air outlet channel and the second air outlet channel are respectively connected to a high-load ventilation pipe and a partial-load ventilation pipe at one end. The first air outlet channel and the second air outlet channel are equipped with valve plates for opening and closing. The other end of the high-load ventilation pipe is connected to the vehicle air filter, and the other end of the partial-load ventilation pipe is connected to the intake manifold. When the pressure inside the crankcase is greater than the pressure in the vehicle's air filter pipeline, the valve in the first outlet passage opens; when the pressure inside the crankcase is greater than the pressure in the intake manifold, the valve in the second outlet passage opens. The air supply pipe assembly is installed on the cylinder block, with one end connected to the vehicle's air filter and the other end extending into the crankcase for supplying air to the crankcase. The return valve is installed on the return oil hole at the bottom of the cylinder block.

2. The crankcase ventilation system according to claim 1, characterized in that, The cylinder head cover assembly includes a cylinder head cover body, an oil-gas separator, and a vent pipe connection. The cylinder head cover body has an internal cavity, in which an oil-gas separator is disposed, and the cavity is connected to the outlet side of the oil-gas separator. The vent pipe connector is located on the top of the cylinder head cover body. The vent pipe connector has a second cavity and a third cavity inside, and valve plates are respectively installed between the second cavity and the third cavity. The vent pipe connection is provided with a first vent and a second vent. One end of the first vent is connected to the high-load ventilation pipe, and the other end of the first vent is connected to the second cavity to form a first vent channel. One end of the second vent is connected to the partial-load ventilation pipe, and the other end is connected to the second cavity to form a second vent channel. The bottom of the cylinder head cover body is connected to the oil return cover plate to form an oil return cavity.

3. The crankcase ventilation system according to claim 1, characterized in that, The valve in the first air outlet channel is a breathing valve.

4. The crankcase ventilation system according to claim 1, characterized in that, The valve in the second air outlet channel is a metal valve.

5. The crankcase ventilation system according to claim 1, characterized in that, The air injection pipe assembly includes an air injection pipe and an air injection check valve. The air injection pipe is installed on the cylinder block, with one end connected to the vehicle air filter and the other end equipped with an air injection check valve that extends into the crankcase.

6. The crankcase ventilation system according to claim 1, characterized in that, The return valve is a one-way valve.

Images