Ventilation device of engine crankcase, engine and vehicle

Abstract

The utility model provides a ventilation device of an engine crankcase, an engine and a vehicle. The ventilation device of the engine crankcase comprises an oil-gas separation assembly, a four-way valve assembly and a PCV pipe. The oil-gas separation assembly separates oil and gas in blow-by gas of an engine, the separated oil is discharged into the oil return channel, and the separated gas is discharged from the gas outlet end of the separator. The four-way valve assembly comprises a first valve port and a second valve port; one end of the PCV pipe is communicated with the air filter air outlet end of the air filter, and the other end is communicated with the first valve port; the second valve port is communicated with the gas outlet end of the separator through a first one-way valve; the first one-way valve is used for opening a gas flow passage from the gas outlet end of the separator to the second valve port under the condition that the gas pressure of the gas outlet end of the separator is higher than that of the second valve port; the four-way valve assembly further comprises a third valve port and a fourth valve port. The third valve port is communicated with a cylinder cover of the engine, and the air outlet end of the separator is further communicated with the fourth valve port. According to the utility model, the requirements of integration, miniaturization and modularization can be met.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of vehicle power, and in particular to a ventilation device for an engine crankcase, an engine and a vehicle. Background Art

[0002] The crankcase ventilation device is an important subsystem of the engine. Its main function is to separate the oil contained in the engine blowby gas. The oil separated by the oil-gas separator flows back to the oil pan through the oil return channel, and the separated gas is reintroduced into the engine intake system, eventually entering the intake manifold, and then entering the combustion chamber to be burned, thus forming an engine closed crankcase ventilation system that meets national regulatory requirements.

[0003] The existing crankcase ventilation device has a complex structure and cannot meet the requirements of the vehicle for the integration, miniaturization and modularization of the crankcase ventilation device. Utility Model Content

[0004] The embodiments of the utility model provide a ventilation device for an engine crankcase, an engine and a vehicle, so as to solve the problem that the existing crankcase ventilation device has a complex structure and cannot meet the requirements of the vehicle for integration, miniaturization and modularization of the crankcase ventilation device.

[0005] In order to solve the above technical problems, the utility model is achieved as follows:

[0006] In a first aspect, an embodiment of the utility model provides a ventilation device for an engine crankcase, comprising: an oil-gas separation assembly, a four-way valve assembly provided on a cylinder head cover of the engine, and a crankcase ventilation PCV pipe;

[0007] The oil-gas separation assembly is used to separate the oil and gas in the engine blowby gas, discharge the separated oil into the oil return channel of the engine cylinder, and discharge the separated gas from the separator outlet end of the oil-gas separation assembly;

[0008] The four-way valve assembly includes: a first valve port, and a second valve port connected to the first valve port; one end of the PCV pipe is connected to the air filter outlet of the air filter, and the other end is connected to the first valve port; the second valve port is connected to the separator outlet through a first one-way valve, wherein the first one-way valve is used to open the air flow passage from the separator outlet to the second valve port when the air pressure at the separator outlet is higher than the air pressure at the second valve port;

[0009] The four-way valve assembly also includes a third valve port and a fourth valve port connected to the third valve port; the third valve port is connected to the cylinder head of the engine, and the separator outlet end is connected to the fourth valve port.

[0010] Optionally, it further comprises: a first cover cover built-in channel integrally formed on the cylinder head cover;

[0011] One end of the PCV pipe is communicated with the first valve port through the first cover cover built-in passage.

[0012] Optionally, it further comprises: a second cover cover built-in channel integrally formed on the cylinder head cover;

[0013] The third valve port is communicated with the cylinder head through the second cover built-in passage.

[0014] Optionally, the four-way valve assembly further includes: a first valve chamber;

[0015] The first valve port is connected to the second valve port through the first valve cavity; the first valve cavity is also connected to the crankcase inner cavity of the crankcase through a second one-way valve, and the second one-way valve is used to open the air flow passage from the second valve port to the crankcase inner cavity when the air pressure at the second valve port is higher than the air pressure in the crankcase inner cavity.

[0016] Optionally, the four-way valve assembly further includes: a second valve chamber independent of the first valve chamber;

[0017] The third valve port is connected to the fourth valve port through the second valve cavity, and the second valve cavity is connected to the oil return channel of the engine cylinder through the third one-way valve. When the third one-way valve is opened, the oil return path from the second valve cavity to the oil return channel is connected.

[0018] Optionally, the third one-way valve includes: an oil return umbrella valve.

[0019] Optionally, the engine has one or more cylinders, and the third valve port is connected to each of the engine cylinders respectively.

[0020] Optionally, the PCV tube includes a non-detachable PCV tube.

[0021] In a second aspect, an embodiment of the utility model provides an engine, comprising a ventilation device for an engine crankcase as described in any one of the first aspects.

[0022] In a third aspect, an embodiment of the utility model provides a vehicle, comprising a vehicle body, and an engine for providing power for the movement of the vehicle body, wherein the engine comprises a ventilation device for an engine crankcase as described in any one of the first aspects.

[0023] In the four-way valve assembly of the embodiment of the utility model, the cavity composed of the first valve port and the second valve port and the cavity composed of the third valve port and the fourth valve port are independent of each other. By setting the first one-way valve, the airflow (crankcase blowby) between the two cavities can be controlled to be diverted, thereby realizing the cyclic combustion of the diverted airflow, which can effectively reduce the pollutant emissions of the vehicle. The embodiment of the utility model has a simple structure and can meet the requirements of the vehicle for the integration, miniaturization and modularization of the crankcase ventilation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1a This is a schematic diagram of the structure of the ventilation device of the utility model embodiment applied to the engine;

[0026] Figure 1b It is a schematic diagram of the assembly of a four-way valve assembly in a ventilation device according to an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the operating principle of the ventilation device of the utility model embodiment in the first operating mode;

[0028] Figure 3 This is a schematic diagram of the operating principle of the ventilation device in the second operating mode according to an embodiment of the utility model;

[0029] Figure 4 It is a schematic diagram of the internal structure of the four-way valve assembly cavity;

[0030] Figure 5 It is a structural schematic diagram of a non-detachable PCV pipe;

[0031] in:

[0032] 100, cylinder head cover; 200, oil-gas separation assembly; 300, oil return channel; 400, engine cylinder; 500, air filter; 600, cylinder head;

[0033] 1. Four-way valve assembly; 11. First valve port; 12. Second valve port; 13. Third valve port; 14. Fourth valve port;

[0034] 2. PCV pipe;

[0035] 31. First one-way valve; 32. Second one-way valve; 33. Third one-way valve;

[0036] 4. The first cover has a built-in channel; 5. The second cover has a built-in channel. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0039] In the technical solution of the present disclosure, words such as “connect”, “couple” or “connected” are not limited to physical or mechanical connections, but may include electrical connections.

[0040] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0041] The utility model provides a ventilation device for an engine crankcase, see Figures 1a to 3 As shown, the ventilation device includes: an oil-gas separation assembly 200, a four-way valve assembly 1 provided on a cylinder head cover 100 of the engine, and a crankcase ventilation PCV pipe 2;

[0042] The oil-gas separation assembly 200 is used to separate the oil and gas in the engine blowby gas, discharge the separated oil into the oil return channel 300 of the engine cylinder 400, and discharge the separated gas from the separator outlet 201 of the oil-gas separation assembly 200;

[0043] The four-way valve assembly 1 includes: a first valve port 11, and a second valve port 12 connected to the first valve port 11; one end of the PCV pipe 2 is connected to the air filter outlet end of the air filter 500, and the other end is connected to the first valve port 11; the second valve port 12 is connected to the separator outlet end 201 through the first check valve 31, wherein the first check valve 31 is used to open the air flow passage from the separator outlet end 201 to the second valve port 12 when the air pressure at the separator outlet end 201 is higher than the air pressure at the second valve port 12;

[0044] The four-way valve assembly 1 further includes a third valve port 13 and a fourth valve port 14 connected to the third valve port 13 ; the third valve port 13 is connected to the cylinder head 600 of the engine, and the separator outlet end 201 is also connected to the fourth valve port 14 .

[0045] In the embodiment of the utility model, the cavity formed by the first valve port 11 and the second valve port 12 and the cavity formed by the third valve port 13 and the fourth valve port 14 are independent of each other, which can effectively avoid the mutual disturbance of the airflows flowing through the two cavities. In addition, by setting the first one-way valve 31, the airflow is switched between the two cavities. When the air pressure at the separator outlet end 201 is higher than the air pressure of the second valve port 12, the airflow flows through the cavity formed by the first valve port 11 and the second valve port 12; in other cases, the airflow flows through the cavity formed by the third valve port 13 and the fourth valve port 14. The embodiment of the utility model can control the airflow diversion without setting an electric control device, with low cost and high reliability.

[0046] The following is explained in conjunction with a specific example, specifically referring to FIG1 , after the crankcase blowby gas (including gasoline, engine oil and water vapor) is separated by the oil-gas separation assembly 200 mounted on the engine cylinder 400, the separated large particles of engine oil flow back to the engine oil pan through the oil return channel 300, and the separated crankcase blowby gas enters the cavity of the four-way valve assembly 1 along the built-in channel (engine cylinder 400 → cylinder head 600 → cylinder head cover 100). The cavity of the four-way valve assembly is divided into two independent functional chambers of high and low loads (i.e., equivalent to the first valve chamber 101 and the second valve chamber 102 in the embodiment of the utility model) by a partition. With different operating conditions of the engine, the separated crankcase blowby gas is diverted through different functional chambers to achieve the diversion of the crankcase blowby gas.

[0047] See also Figure 1b As shown, Figure 1b The assembly structure of the four-way valve assembly 1 on the cylinder head cover 100 is shown. According to the engine layout design, the four-way valve assembly 1 is arranged at the rear end of the intake side of the cylinder head cover 100. Figure 4It is a schematic diagram of the internal structure of the four-way valve assembly. Through the unique structural design of the four-way valve assembly (divided into two independent chambers (the first valve chamber 101 and the second valve chamber 102), integrating two diaphragm one-way valves and two umbrella valves), the crankcase pressure regulation, crankcase blowby gas diversion, low-load air replenishment and oil return functions are realized.

[0048] In the embodiment of the utility model, the ventilation device includes two operating modes, see Figure 2 As shown, the green arrow indicates the flow direction of the crankcase blowby gas, the blue arrow indicates the flow direction of the fresh air from outside the ventilation device, and the yellow arrow indicates the flow direction of the oil in the oil return channel. Figure 2 The first operating mode is shown, corresponding to the engine running under low load conditions, the intake manifold is negative pressure, under the action of the intake manifold vacuum, the crankcase blowby gas after the four-way valve assembly 1 enters the internal channel pressure stabilizing chamber (i.e., the first valve chamber 101) integrated in the cylinder head cover product, and the crankcase blowby gas is evenly distributed in the pressure stabilizing chamber. According to the ignition sequence of the engine, the crankcase blowby gas passes through the built-in channel (the four intake ducts integrated in the intake duct of the cylinder head 600, and the four intake ducts correspond to Figure 1a The air in the cylinder head 600 is then fed into the cylinder head 600 through the 1-4 air passages to participate in combustion, forming a closed cycle. When the engine is running at low load, in order to maintain the engine crankcase pressure within a suitable range, fresh air is added to the engine crankcase through the high-load built-in passage.

[0049] See also Figure 3 As shown, the green arrow indicates the flow direction of the crankcase blowby gas, and the yellow arrow indicates the flow direction of the oil in the return oil channel. Figure 3 The second operation mode is shown, corresponding to the engine running under high load conditions. Under the vacuum of the intake passage of the cylinder head 600, part of the crankcase blowby gas in the engine crankcase still enters the cylinder head intake passage along the low load passage and burns. Under the vacuum of the crankcase ventilation pipe connection after the engine air filter 500, part of the crankcase blowby gas enters the intake pipe after the air filter through the high load chamber built-in passage on the four-way valve assembly 1 (i.e., the first valve chamber 101 in the embodiment of the utility model), the high load built-in passage on the cylinder head cover 100, and the external crankcase ventilation pipe (i.e., the PCV pipe 2 in the embodiment of the utility model), and enters the intake manifold with the engine intake, and is finally burned. When the engine is running under high load conditions, the engine has a large amount of air leakage, and fresh air is no longer added to the engine.

[0050] In the four-way valve assembly 1 of the utility model embodiment, the cavity composed of the first valve port 11 and the second valve port 12 and the cavity composed of the third valve port 13 and the fourth valve port 14 are independent of each other. The first one-way valve 31 is provided to realize the flow control of the airflow (crankcase blowby) between the two cavities, thereby realizing the cyclic combustion of the diverted airflow, which can effectively reduce the pollutant emission of the vehicle. The utility model embodiment has a simple structure and can meet the requirements of the vehicle for the integration, miniaturization and modularization of the crankcase ventilation device.

[0051] The embodiment of the utility model can realize air flow diversion control without setting an electronic control device. The four-way valve assembly 1 forms a closed crankcase ventilation system under the premise of realizing diversion of crankcase blowby gas, which can effectively reduce the pollutant emissions of the vehicle.

[0052] In some embodiments of the utility model, optionally, in the actual application process, the separated oil is discharged into the oil return channel on the cylinder body and the oil pan through the oil-gas separation assembly and flows back to the oil pan, and the separated gas is discharged from the separator outlet end of the oil-gas separation assembly into the built-in channel. Correspondingly, the third valve port is connected to the built-in channel of the engine cylinder head cover, and the cylinder head cover is connected to the fourth valve port.

[0053] In some embodiments of the present invention, optionally, see Figures 1a to 3 As shown, the ventilation device of the engine crankcase further includes: a first cover built-in channel 4 integrally formed on the cylinder head cover 100; one end of the PCV pipe 2 is connected to the first valve port 11 through the first cover built-in channel 4. By adopting the first cover built-in channel 4, it is ensured that the connection between the PCV pipe 2 and the first valve port 11 is reliably sealed and can effectively prevent icing.

[0054] In some embodiments of the present invention, optionally, see Figure 1a , Figure 2 and Figure 3 As shown, the ventilation device of the engine crankcase further includes: a second cover built-in channel 5 integrally formed on the cylinder head cover 100; the third valve port 13 is connected to the cylinder head 600 of the engine through the second cover built-in channel 5. By adopting the second cover built-in channel 5, it is ensured that the connection between the third valve port 13 and the cylinder head 600 of the engine is reliably sealed and can effectively prevent ice.

[0055] See also Figure 3As shown, in the second operation mode, the engine is running under high load conditions. Under the vacuum of the intake passage of the cylinder head 600, part of the crankcase blowby gas still enters the cylinder head intake passage along the low load passage (i.e., the second cover built-in passage 5 in the embodiment of the utility model) and burns. Under the vacuum of the crankcase ventilation pipe connection after the engine air filter 500, part of the crankcase blowby gas enters the intake pipe after the air filter through the high load chamber built-in passage on the four-way valve assembly 1 (i.e., the first valve chamber 101 in the embodiment of the utility model), the high load built-in passage on the cylinder head cover 100 (i.e., the first cover built-in passage 4 in the embodiment of the utility model), and the external crankcase ventilation pipe (i.e., the PCV pipe 2 in the embodiment of the utility model), and enters the intake manifold with the engine intake, and is finally burned. When the engine is running under high load conditions, the engine has a large amount of gas leakage, and fresh air is no longer added to the engine.

[0056] In some embodiments of the present invention, optionally, see Figures 2 to 4 As shown, the four-way valve assembly 1 further includes: a first valve chamber 101;

[0057] The first valve port 11 is connected to the second valve port 12 through the first valve cavity 101; the first valve cavity 101 is also connected to the crankcase inner cavity of the crankcase through the second one-way valve 32, and the second one-way valve 32 is used to open the air flow path from the second valve port 12 to the crankcase inner cavity when the air pressure at the second valve port 12 is higher than the air pressure in the crankcase inner cavity.

[0058] In some embodiments of the present invention, optionally, see Figures 2 to 4 As shown, the four-way valve assembly 1 further includes: a second valve chamber 102 independent of the first valve chamber 101;

[0059] The third valve port 13 is connected to the fourth valve port 14 through the second valve cavity 102, and the second valve cavity 102 is connected to the return oil channel 300 of the engine cylinder 400 through the third one-way valve 33. When the third one-way valve 33 is opened, the return oil path from the second valve cavity 102 to the return oil channel 300 is connected.

[0060] See also Figure 1b As shown, Figure 1b The assembly structure of the four-way valve assembly 1 on the cylinder head cover 100 is shown. According to the engine layout design, the four-way valve assembly 1 is arranged at the rear end of the intake side of the cylinder head cover 100. Figure 4 It is a schematic diagram of the internal structure of the four-way valve assembly. Through the unique structural design of the four-way valve assembly (divided into two independent chambers (the first valve chamber 101 and the second valve chamber 102), integrating two diaphragm one-way valves and two umbrella valves), the crankcase pressure regulation, crankcase blowby gas diversion, low-load air replenishment and oil return functions are realized.

[0061] In some embodiments of the present invention, optionally, the third one-way valve 33 includes: an oil return umbrella valve.

[0062] In some embodiments of the present invention, optionally, see Figure 1a As shown, the engine cylinder 400 has one or more, and the third valve port 13 is connected to each engine cylinder 400 respectively.

[0063] See also Figure 2 As shown, the first operating mode corresponds to the engine running under low load conditions, the intake manifold is negative pressure, and under the action of the intake manifold vacuum, the crankcase blowby gas after the four-way valve assembly 1 enters the internal channel pressure stabilizing chamber (i.e., the second valve chamber 102) integrated in the cylinder head cover product, and the crankcase blowby gas is evenly distributed in the pressure stabilizing chamber. According to the ignition sequence of the engine, the crankcase blowby gas passes through the built-in channel (the four intake ducts integrated in the intake duct of the cylinder head 600, and the four intake ducts correspond to Figure 1a The air passages 1-4, i.e. the engine cylinder 400 in the embodiment of the utility model, enter the cylinder head 600 to participate in combustion, forming a closed cycle. When the engine is running at low load, in order to maintain the engine crankcase pressure within a suitable range, fresh air is added to the engine crankcase through the high load built-in passage.

[0064] It should be noted that the number of engine cylinders 400 varies depending on the engine model, and is not specifically limited here. However, the lack of specific limitation should not be considered unclear.

[0065] In some embodiments of the present invention, optionally, see Figure 5 As shown, the PCV pipe 2 comprises a non-detachable PCV pipe.

[0066] The crankcase ventilation pipe (PCV pipe 2) is connected to the cylinder head cover and the pipeline after the vehicle air filter. The female connector at the connecting end of the crankcase ventilation pipe is assembled with the male connector of the connector and then rigidly connected together to achieve non-removable. In the embodiment of the utility model, the PCV pipe 2 includes a non-removable PCV pipe. Although the crankcase ventilation pipe (PCV pipe) adopting the non-removable solution faces the problem of difficulty in replacing parts in the aftermarket, generally speaking, the crankcase ventilation pipe (PCV pipe) has a low probability of disassembly and replacement, and has the same lifespan as the engine. Under the premise of comprehensively meeting the requirements of the National VI regulations, the sample development cost is low, and it is recommended to adopt it.

[0067] An embodiment of the utility model provides an engine, comprising a ventilation device for an engine crankcase as described in any one of the embodiments of the utility model.

[0068] An embodiment of the utility model provides a vehicle, comprising a vehicle body and an engine for providing power for the movement of the vehicle body, wherein the engine comprises a ventilation device for an engine crankcase as described in any one of the embodiments of the utility model.

[0069] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A ventilation device for an engine crankcase, characterized in that: include: Oil-gas separation assembly, four-way valve assembly located on the cylinder head cover of the engine, and crankcase ventilation PCV pipe; The oil-gas separation assembly is used to separate the oil and gas in the engine blowby gas, discharge the separated oil into the oil return channel of the engine cylinder, and discharge the separated gas from the separator outlet end of the oil-gas separation assembly; The four-way valve assembly includes: a first valve port, and a second valve port connected to the first valve port; one end of the PCV pipe is connected to the air filter outlet of the air filter, and the other end is connected to the first valve port; the second valve port is connected to the separator outlet through a first one-way valve, wherein the first one-way valve is used to open the air flow passage from the separator outlet to the second valve port when the air pressure at the separator outlet is higher than the air pressure at the second valve port; The four-way valve assembly also includes a third valve port and a fourth valve port connected to the third valve port; the third valve port is connected to the cylinder head of the engine, and the separator outlet end is also connected to the fourth valve port.

2. The ventilation device for an engine crankcase according to claim 1, characterized in that: Also includes: a first cover cover internal channel integrally formed on the cylinder head cover; One end of the PCV pipe is communicated with the first valve port through the first cover cover built-in passage.

3. The engine crankcase ventilation device according to claim 1 or 2, characterized in that: Also includes: a second cover having a built-in channel integrally formed on the cylinder head cover; The third valve port is communicated with the cylinder head through the second cover built-in passage.

4. The ventilation device for an engine crankcase according to claim 1, characterized in that: The four-way valve assembly further includes: a first valve chamber; The first valve port is connected to the second valve port through the first valve cavity; the first valve cavity is also connected to the crankcase inner cavity of the crankcase through a second one-way valve, and the second one-way valve is used to open the air flow passage from the second valve port to the crankcase inner cavity when the air pressure at the second valve port is higher than the air pressure in the crankcase inner cavity.

5. The ventilation device for an engine crankcase according to claim 4, characterized in that: The four-way valve assembly further includes: a second valve chamber independent of the first valve chamber; The third valve port is connected to the fourth valve port through the second valve cavity, and the second valve cavity is connected to the oil return channel of the engine cylinder through the third one-way valve. When the third one-way valve is opened, the oil return path from the second valve cavity to the oil return channel is connected.

6. The ventilation device for an engine crankcase according to claim 5, characterized in that: The third one-way valve includes: an oil return umbrella valve.

7. The ventilation device for an engine crankcase according to claim 1, characterized in that: The engine has one or more cylinders, and the third valve port is communicated with each of the engine cylinders respectively.

8. The ventilation device for an engine crankcase according to claim 1, characterized in that: The PCV pipe includes a non-detachable PCV pipe.

9. An engine, characterized in that: A ventilation device for an engine crankcase comprising the invention as claimed in any one of claims 1 to 8.

10. A vehicle comprising a vehicle body and an engine for providing power for the movement of the vehicle body, characterized in that: The engine comprises a ventilation device for an engine crankcase according to any one of claims 1 to 8.

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