CN109281730B

CN109281730B - Crankcase ventilation system and car

Info

Publication number: CN109281730B
Application number: CN201811115578.6A
Authority: CN
Inventors: 喻忠成; 刘岩; 杨万里; 王瑞平
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Fengrui Engine Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Fengrui Engine Co Ltd
Priority date: 2018-09-25
Filing date: 2018-09-25
Publication date: 2020-04-21
Anticipated expiration: 2038-09-25
Also published as: CN109281730A

Abstract

The invention provides a crankcase ventilation system and an automobile, and relates to the technical field of automobiles, wherein the crankcase ventilation system comprises an oil-gas separator and a camshaft; the oil-gas separator is arranged in the radial direction of the camshaft and is fixedly connected with the camshaft; the oil-gas separator is a centrifugal oil-gas separator. In the use process, the camshaft rotates to drive the oil-gas separator to rotate, and the oil-gas separator rotates to separate oil drops from gas. Therefore, the crankcase ventilation system can drive the centrifugal oil-gas separator to rotate by utilizing the rotation of the camshaft, so that the separation of oil drops and gas is completed. Therefore, the oil-gas separator can be prevented from being independently arranged on the crankcase, the change of the engine body part is small, and the development period and the cost are short.

Description

Crankcase ventilation system and car

Technical Field

The invention relates to the technical field of automobiles, in particular to a crankcase ventilation system and an automobile.

Background

During operation of the engine, high-pressure combustible mixture and burned gas in the combustion chamber leak into the crankcase through a gap between the piston group and the cylinder to a greater or lesser extent, resulting in blow-by. The blow-by gas is composed of unburned fuel gas, water vapor, exhaust gas and the like, which can dilute the engine oil, reduce the service performance of the engine oil and accelerate the oxidation and deterioration of the engine oil. The water and the air are condensed in the engine oil to form oil sludge and block an oil way; acid gases in the exhaust gas are mixed into the lubrication system, which can cause corrosion and accelerated wear of engine parts; blow-by also causes the crankcase pressure to be too high and the crankcase seal to be broken, allowing oil to leak and run off. Crankcase ventilation must be implemented to prevent excessive crankcase pressure, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage.

Currently, crankcase ventilation is implemented by separating the crank gas through an oil-gas separator inside or above the cylinder head cover, then introducing the crank gas into a special crank passage inside the cylinder head, then introducing the crank gas into an intake manifold through an intake manifold flange on the cylinder head, and distributing the separated crank gas to branch pipes of each intake manifold, wherein a PCV valve can be arranged in one link.

However, prior art crankcase ventilation implementations have been significantly modified from engine body members, requiring long development cycles and costs.

Disclosure of Invention

The invention aims to provide a crankcase ventilation system and an automobile, aiming at solving the technical problems that the implementation means of crankcase ventilation in the prior art has great change on an engine body piece, and needs a long development period and cost.

The invention provides a crankcase ventilation system, which comprises an oil-gas separator and a camshaft; the oil-gas separator is arranged in the radial direction of the camshaft and is fixedly connected with the camshaft; the oil-gas separator is a centrifugal oil-gas separator.

Further, the oil-gas separator comprises a connecting part and a separating part; the connecting part is fixedly connected with the camshaft, and the separating part extends from the connecting part along the direction far away from the camshaft; the separation part is provided with an oil inlet hole, an air outlet hole and an oil outlet mechanism.

Further, the separating part is conical; the bottom of the conical separation part is fixedly connected with the connecting part; the air outlet is arranged on the side wall of the separation part; the oil outlet mechanism is arranged at the top of the separation part.

Further, the oil outlet mechanism is a rubber part; the rubber part is conical, the interior of the rubber part is hollow, and the top of the rubber part is cut with an opening; the side walls at the two sides of the opening are abutted; when the stress at the opening reaches a preset value, the side walls at the two sides of the opening are separated to expose the opening.

Furthermore, an included angle between the extending direction of the air outlet and the extending direction of the separating part is an obtuse angle.

Furthermore, the crankcase ventilation system also comprises a crankcase, a cylinder cover crank block bearing seat and a cylinder cover crank block bearing seat; the cylinder cover crank shaft block and the cylinder cover crank shaft block are arranged at one end of the crankcase, and the cylinder cover crank shaft block are enclosed into a gas collection cavity; the oil-gas separator is arranged in the gas collection cavity; the inner wall of the gas collection cavity is provided with an annular oil collection groove; the oil outlet end of the oil-gas separator is embedded into the oil collecting groove; the oil collecting groove is used for being communicated with the oil pan.

Further, the crankcase ventilation system further comprises a PCV valve; the PCV valve is arranged inside the camshaft; the oil-gas separator communicates with the interior of the crankcase through a PCV valve.

Furthermore, a first sealing plug and a second sealing plug are arranged on the inner wall of the crankcase; the first sealing plug and the PCV valve form a first cavity, and the second sealing plug and the PCV valve form a second cavity; the cylinder cover crank gear bearing seat and the cylinder cover crank gear bearing seat are respectively provided with a first channel and a second channel; a third channel and a fourth channel are arranged on the camshaft; the first channel and the second channel are used for communicating the interior of the crankcase with the first cavity through the third channel respectively; and the fourth channel communicates the second cavity with the oil-gas separator.

Further, the number of the separation parts is two; the two separation parts are correspondingly arranged on two sides of the connecting part.

Further, the invention also provides an automobile which comprises the crankcase ventilation system.

In the crankcase ventilation system provided by the invention, in the use process, the camshaft rotates to drive the oil-gas separator to rotate, and the oil-gas separator rotates to separate oil drops from gas.

Therefore, the crankcase ventilation system can drive the centrifugal oil-gas separator to rotate by utilizing the rotation of the camshaft, so that the separation of oil drops and gas is completed. Therefore, the oil-gas separator can be prevented from being independently arranged on the crankcase, the change of the engine body part is small, and the development period and the cost are short.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of a crankcase ventilation system provided in accordance with an embodiment of the invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a partial schematic structural diagram of an oil-gas separator provided in an embodiment of the invention;

fig. 4 is a sectional view of an oil separator provided in an embodiment of the present invention.

Icon: 1-an oil-gas separator; 2-a camshaft; 3-a connecting part; 4-a separation section; 5-oil inlet hole; 6-air outlet holes; 7-an oil outlet mechanism; 8-rubber parts; 9-opening; 10-a side wall; 11-a crankcase; 12-cylinder head cover crank gear bearing seat; 13-cylinder cover crank gear bearing seat; 14-a gas collection cavity; 15-oil collecting grooves; 16-PCV valve; 17-a first sealing plug; 18-a second sealing plug; 19-a first cavity; 20-a second cavity; 21-a first channel; 22-a second channel; 23-a third channel; 24-a fourth channel; 2101-a first radial channel; 2102-a first curved channel; 2201-a second radial channel; 2202-second curved channel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

FIG. 1 is a cross-sectional view of a crankcase ventilation system provided in accordance with an embodiment of the invention; FIG. 2 is an enlarged view taken at A in FIG. 1; as shown in fig. 1 and 2, the present embodiment provides a crankcase ventilation system including an air-oil separator 1 and a camshaft 2; the oil-gas separator 1 is arranged in the radial direction of the camshaft 2, and the oil-gas separator 1 is fixedly connected with the camshaft 2; the oil-gas separator 1 is a centrifugal oil-gas separator.

The oil-gas separator 1 is fixedly connected with the camshaft 2 in various ways; for example: the oil-gas separator 1 and the camshaft 2 are fixedly connected through a hoop, or the oil-gas separator 1 and the camshaft 2 are connected through a fixing bolt.

The oil-gas separator 1 is detachably and fixedly connected with the camshaft 2. Therefore, the user can conveniently disassemble, assemble or replace parts.

The principle of the centrifugal oil-gas separator 1 is as follows: oil drops and gas are separated by utilizing the difference of inertia force between the oil drops in the oil mist and the gas when the flow direction is changed.

The crankcase ventilation system provided by the embodiment comprises an oil-gas separator 1 and a camshaft 2; the oil-gas separator 1 is arranged in the radial direction of the camshaft 2, and the oil-gas separator 1 is fixedly connected with the camshaft 2. In the use process, the camshaft 2 rotates to drive the oil-gas separator 1 to rotate, and the oil-gas separator 1 rotates to separate oil drops from gas.

Therefore, the crankcase ventilation system can utilize the rotation of the camshaft 2 to drive the centrifugal oil-gas separator 1 to rotate, so that the separation of oil drops and gas is completed. This can avoid mounting the gas-oil separator 1 separately on the crankcase 11, and the modification of the engine body member is small, requiring a short development period and cost.

FIG. 3 is a partial schematic structural diagram of an oil-gas separator provided in an embodiment of the invention; FIG. 4 is a sectional view of an oil separator provided in an embodiment of the present invention; as shown in fig. 2 to 4, on the basis of the above embodiment, further, the oil separator 1 includes a connecting portion 3 and a separating portion 4; the connecting part 3 is fixedly connected with the camshaft 2, and the separating part 4 extends from the connecting part 3 in the direction far away from the camshaft 2; the separating part 4 is provided with an oil inlet 5, an air outlet 6 and an oil outlet mechanism 7.

The connecting portion 3 and the separating portion 4 may be made of plastic.

The connecting portion 3 and the separating portion 4 are injection molded.

Connecting portion 3 can be cyclic annular, and connecting portion 3 cup joints on camshaft 2's outer wall to with 2 interference fit of camshaft, in order to guarantee the stability that camshaft 2 is connected with oil and gas separator 1.

The oil outlet mechanism 7 can be arranged at one end of the separation part 4 far away from the camshaft 2, so that oil can be thrown to the oil outlet mechanism 7 under the action of centrifugal force.

In the embodiment, during the use process, oil mist enters the separating part 4 from the oil inlet 5, the separating part 4 rotates synchronously with the camshaft 2, so that centrifugal force is generated, gas is discharged from the gas outlet 6, and oil is discharged from the oil outlet mechanism 7.

As shown in fig. 2 to 4, in addition to the above embodiments, further, the separation part 4 is tapered; the bottom of the conical separation part 4 is fixedly connected with the connecting part 3; the air outlet 6 is arranged on the side wall 10 of the separation part 4; the oil discharge mechanism 7 is provided at the top of the separation section 4.

Wherein, the venthole 6 can be a plurality of, and a plurality of ventholes 6 interval sets up. Therefore, gas can be discharged more smoothly, and oil-gas separation is accelerated.

In this embodiment, in the use, fluid is got rid of to mechanism 7 department of producing oil under the effect of centrifugal force. The conical arrangement enables the oil outlet mechanism 7 to better accommodate the separated oil.

As shown in fig. 2 to 4, in addition to the above embodiments, further, the oil outlet mechanism 7 is a rubber member 8; the rubber part 8 is conical, the inside of the rubber part 8 is hollow, and an opening 9 is cut at the top of the rubber part 8; the side walls 10 at the two sides of the opening 9 are abutted; when the force at the opening 9 reaches a preset value, the side walls 10 on both sides of the opening 9 are separated to expose the opening 9.

Wherein, the oil outlet mechanism 7 is detachably and fixedly connected with the separating part 4.

The oil outlet mechanism 7 is sleeved on the top of the separation part 4, and the oil outlet mechanism 7 is in interference fit with the separation part 4.

The preset values are as follows: in the process that camshaft 2 drives separation portion 4 pivoted, certain fluid can be saved to the inside of rubber spare 8, and when the centrifugal force of fluid was greater than a numerical value, the lateral wall 10 separation of opening 9 both sides, opening 9 exposed, and this numerical value is the default promptly.

In the embodiment, in the using process, the opening 9 is closed, when oil is thrown to the rubber piece 8, the oil can be accumulated in the conical rubber piece 8, the accumulated oil is more and more accumulated along with the oil, the rotating shaft of the cam shaft 2 enables the accumulated oil to have centrifugal force, the centrifugal force acts on the inner wall of the rubber piece 8, when the centrifugal force of the oil acting on the opening 9 reaches a preset value, the side walls 10 on two sides of the opening 9 are separated, the opening 9 is exposed, and the accumulated oil is thrown out of the oil outlet mechanism 7; after the oil is discharged, because the centrifugal force is smaller, the side walls 10 on the two sides of the opening 9 are in butt joint again under the action of elastic restoring force to close the opening 9, and the process is repeated. The oil outlet mechanism 7 is simple in structure, low in cost and easy to operate.

As shown in fig. 2 to 4, in addition to the above-mentioned embodiments, further, the included angle between the extending direction of the air outlet 6 and the extending direction of the separating portion 4 is an obtuse angle.

That is, the angle a between the direction in which the gas flows out of the separation section 4 in the gas outlet 6 and the direction of the centrifugal force is an obtuse angle.

The centrifugal force of gas is less than oil, and oil is got rid of to oil mechanism 7 department under the effect of centrifugal force, and gas flows out along with the structure wall, flows into in the venthole 6 from separation portion 4 promptly.

In this embodiment, when the gas flows into the gas outlet 6 from the separation part 4 during use, the flow direction is sharply turned, so that the microscopic separation effect can be further enhanced, and the separation can be optimized.

As shown in fig. 1 and 2, in addition to the above embodiment, further, the crankcase ventilation system further includes a crankcase 11, a cylinder head cover crank block bearing seat 12, and a cylinder head crank block bearing seat 13; the cylinder cover crank block bearing seat 12 and the cylinder cover crank block bearing seat 13 are both arranged at one end of the crankcase 11, and the cylinder cover crank block bearing seat 12 and the cylinder cover crank block bearing seat 13 are enclosed into a gas collection cavity 14; the oil-gas separator 1 is arranged in the gas collection cavity 14; an annular oil collecting groove 15 is formed in the inner wall of the gas collecting cavity 14; the oil outlet end of the oil-gas separator 1 is embedded into the oil collecting groove 15; the oil collecting groove 15 is used for communicating with an oil pan.

The cylinder cover crank block bearing seat 12 and the cylinder cover crank block bearing seat 13 are bonded through anaerobic adhesive.

The opening 9 of the rubber member 8 is embedded in the oil collecting groove 15.

In the embodiment, in the use process, after the oil-gas separator 1 separates oil and gas, the gas is discharged into the gas collecting cavity 14 along the gas outlet 6, the oil enters the oil collecting groove 15 from the liquid outlet end, and the oil collecting groove 15 is communicated with the oil pan so that the oil flows into the oil pan. The gas collecting cavity 14 and the oil collecting groove 15 are arranged to separate oil and gas after separation, the structure is simple, and the change of the engine body is small.

As shown in fig. 2, in addition to the above embodiment, further, the crankcase ventilation system further includes a PCV valve 16; the PCV valve 16 is provided inside the camshaft 2; the oil separator 1 communicates with the inside of the crankcase 11 through the PCV valve 16.

The PCV valve 16 is fixedly connected to the inner wall of the camshaft 2. For example: the PCV valve 16 is snap-fitted, bolted, or the PCV valve 16 is interference-fitted with the camshaft 2.

The connecting portion 3 is provided with a communication hole that communicates with the oil inlet hole 5 on the separating portion 4, thereby communicating the PCV valve 16 with the separating portion 4.

In the embodiment, since the internal temperature of the engine is high, the PCV valve 16 is disposed inside the camshaft 2, and it is possible to avoid an internal passage icing fault of the PCV valve 16 when the temperature is low; on the basis of solving the exemption requirement of the engine on the control of the evaporative emissions of the crankcase 11, the colleague saves the parts such as the arrangement hose and the pipe hoop, reduces the cost and the number of parts, reduces the leakage risk, simplifies the assembly process and is more compact in arrangement.

As shown in fig. 2, in addition to the above embodiment, further, the inner wall of the crankcase 11 is provided with a first sealing plug 17 and a second sealing plug 18; the first sealing plug 17 and the PCV valve 16 form a first cavity 19, and the second sealing plug 18 and the PCV valve 16 form a second cavity 20; the cylinder head cover crank block bearing seat 12 and the cylinder head crank block bearing seat 13 are respectively provided with a first channel 21 and a second channel 22; a third channel 23 and a fourth channel 24 are arranged on the camshaft 2; the first passage 21 and the second passage 22 communicate the interior of the crankcase 11 with the first cavity 19 through the third passages 23, respectively; the fourth passage 24 communicates the second chamber 20 with the gas-oil separator 1.

Wherein the first sealing plug 17 and the second sealing plug 18 are bowl-shaped plugs.

The first channel 21 comprises a first radial channel 2101 and a first curved channel 2102 in communication, and the second channel 22 comprises a second radial channel 2201 and a second curved channel 2202 in communication. The first curved channel 2102 and the second curved channel 2202 are annularly enclosed end to end on the periphery of the camshaft 2. The first curved channel 2102 and the second curved channel 2202 communicate with the third channel 23, respectively.

The first radial passage 2101 is enclosed by the cylinder head cover crankshaft stop bearing seat 12 and the outer wall of the camshaft 2, and the second radial passage 2201 is enclosed by the cylinder head crankshaft stop bearing seat 13 and the outer wall of the camshaft 2. When oil mist passes through the first radial passage 2101 and the second radial passage 2201, part of the oil can be adhered to the outer wall of the camshaft 2, and the bearing lubrication is performed.

The third channel 23 and the fourth channel 24 may be plural, a plurality of the third channels 23 are arranged at intervals, and a plurality of the fourth channels 24 are arranged at intervals.

The number of the separating portions 4 may be plural, and the plurality of separating portions 4 are provided at both sides of the connecting portion 3 at intervals.

In the present embodiment, during use, oil mist enters the third passage 23 through the first passage 21 and the second passage 22, then flows into the first chamber 19, then enters the second chamber 20 through the PCV valve 16, and finally flows into the gas-oil separator 1 through the fourth passage 24. The first sealing plug 17 and the second sealing plug 18 can play a role of sealing, and limit the circulation range of oil mist.

As shown in fig. 2 to 4, in addition to the above embodiment, there are two separating portions 4; two separated parts 4 are correspondingly arranged on two sides of the connecting part 3.

In this embodiment, when camshaft 2 drives oil and gas separator 1 and rotates, the form that two separation portions 4 correspond the setting can make the atress of atress connecting portion 3 more even, can improve oil-gas separation's efficiency simultaneously.

On the basis of the embodiment, the embodiment of the invention further provides an automobile which comprises a crankcase ventilation system.

In this embodiment, the automobile has the crankcase ventilation system, and the effect thereof is the same as that of the crankcase ventilation system, and the description thereof is omitted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crankcase ventilation system, comprising: an oil-gas separator and a camshaft;

the oil-gas separator is arranged in the radial direction of the camshaft and is fixedly connected with the camshaft; the oil-gas separator is a centrifugal oil-gas separator;

the oil-gas separator comprises a connecting part and a separating part;

the connecting part is fixedly connected with the camshaft, and the separating part extends from the connecting part in the direction far away from the camshaft; the separation part is provided with an oil inlet hole, an air outlet hole and an oil outlet mechanism;

the separation part is conical;

the bottom of the conical separation part is fixedly connected with the connecting part; the air outlet is arranged on the side wall of the separation part; the oil outlet mechanism is arranged at the top of the separation part;

the oil outlet mechanism is a rubber part;

the rubber part is conical, the interior of the rubber part is hollow, and an opening is cut at the top of the rubber part; the side walls at two sides of the opening are abutted; when the stress at the opening reaches a preset value, the side walls at two sides of the opening are separated to expose the opening.

2. The crankcase ventilation system of claim 1, wherein an angle between a direction of extension of the air outlet hole and a direction of extension of the separation portion is an obtuse angle.

3. The crankcase ventilation system of claim 1, further comprising a crankcase, a cylinder head cover crank block bearing block, and a cylinder head crank block bearing block;

the cylinder cover crank shaft block and the cylinder cover crank shaft block are both arranged at one end of the crankcase, and a gas collection cavity is enclosed by the cylinder cover crank shaft block and the cylinder cover crank shaft block; the oil-gas separator is arranged in the gas collection cavity;

an annular oil collecting groove is formed in the inner wall of the gas collecting cavity; the oil outlet end of the oil-gas separator is embedded into the oil collecting groove; the oil collecting groove is used for being communicated with the oil pan.

4. The crankcase ventilation system of claim 3, further comprising a PCV valve;

the PCV valve is disposed inside the camshaft; the air-oil separator communicates with the interior of the crankcase through the PCV valve.

5. The crankcase ventilation system of claim 4, wherein the inner wall of the crankcase is provided with a first sealing plug and a second sealing plug; the first sealing plug and the PCV valve form a first cavity, and the second sealing plug and the PCV valve form a second cavity;

the cylinder cover crank baffle bearing block and the cylinder cover crank baffle bearing block are respectively provided with a first channel and a second channel; a third channel and a fourth channel are arranged on the camshaft; the first passage and the second passage communicate the interior of the crankcase with the first cavity through the third passage, respectively; the fourth channel communicates the second cavity with the gas-oil separator.

6. The crankcase ventilation system of claim 1, wherein the separation portion is two;

the two separating parts are correspondingly arranged on two sides of the connecting part.

7. An automobile, characterized in that it comprises a crankcase ventilation system according to any of claims 1-6.