CN215057651U

CN215057651U - Air inlet structure of crankcase ventilation system, engine and automobile

Info

Publication number: CN215057651U
Application number: CN202121107889.5U
Authority: CN
Inventors: 张向东
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-12-07
Anticipated expiration: 2031-05-21

Abstract

The utility model provides an air inlet structure of a crankcase ventilation system, an engine and an automobile, belonging to the technical field of vehicles, wherein the air inlet structure of the crankcase ventilation system comprises an air inlet manifold and a distribution pipeline; the intake manifold forms a plurality of intake channels, wherein at least one intake channel is provided with a vent hole; the distribution pipeline is arranged on the intake manifold and is communicated with the intake passage through a vent hole; the distribution line is also adapted to be connected to a crankcase ventilation line. The utility model discloses a distribution pipe way sets up on intake manifold's outer wall, through air vent and intake duct intercommunication for the blowby gas can directly get into the intake duct and participate in the burning, has avoided vapor to condense into the frost on the inner wall of intake manifold's import end department, thereby has avoided the peripheral phenomenon of freezing of throttle valve plate.

Description

Air inlet structure of crankcase ventilation system, engine and automobile

Technical Field

The utility model belongs to the technical field of the vehicle, more specifically say, relate to a crankcase ventilation system's air inlet structure, engine and car.

Background

In modern life, vehicles are increasingly used, and problems may arise therewith. For example, during engine operation, more or less of the high pressure combustible mixture of the combustion chamber and the burned gases may leak into the crankcase through the gap between the piston assembly and the cylinder, thereby causing crankcase blow-by. The blow-by gas of the crankcase is composed of unburned fuel gas, water vapor, waste gas and the like, and all the components can dilute the engine oil, so that the service performance of the engine oil is reduced, and the oxidation and the deterioration of the engine oil are accelerated. Crankcase ventilation is necessary to prevent excessive crankcase pressure, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage.

The existing ventilation system of the engine crankcase mainly comprises an oil-gas separator, a PCV valve and related pipelines in an engine cylinder head cover. In the running process of the engine, the engine oil in the blow-by gas is separated through the oil-gas separator, and meanwhile, the blow-by gas of the crankcase is introduced into the air inlet manifold and then enters the combustion chamber for combustion.

In the prior art, blow-by gas is channeled directly into the inlet end of the intake manifold via a crankcase ventilation line, as shown in FIG. 4. When the vehicle runs in a low-temperature environment, water vapor in the blow-by gas is condensed into frost in the intake manifold in contact with fresh cold air, and the frost is collected around an inlet of a crankcase ventilation pipeline and is spread on the inner wall surface of the intake manifold; after the engine is stopped, the temperature of the inner cavity of the air intake manifold can be quickly increased in a short time by high-temperature radiation and heat conduction from the cylinder, so that frost-melting water flows and finally converges in the rear area of the valve plate of the underlying throttle body, and the frost-melting water freezes on the periphery of the throttle valve plate after being kept at low temperature for a period of time. The icing can cause the engine to start and run, the throttle valve plate can not act along with the running instruction of the engine due to resistance, and can not reach the target position, so that the rotating speed fluctuation of the engine is formed, and the vehicle can enter a throttle power-off limping state in serious cases.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a crankcase ventilation system's air intake structure aims at solving the technical problem that the vapor in the blowby gas can condense into frost on intake manifold's inner wall under the low temperature environment that exists among the prior art.

In order to achieve the above object, the utility model adopts the following technical scheme: there is provided an air intake structure of a crankcase ventilation system, including:

the air inlet manifold is provided with a plurality of air inlet channels, and at least one air inlet channel is provided with a vent hole;

a distribution line provided on the intake manifold and communicating with the intake passage through the vent hole; the distribution line is also adapted to be connected to a crankcase ventilation line.

In a possible realization, the distribution line is provided on a top wall of the intake manifold.

The distribution pipeline has a plurality of distribution modes, and in some embodiments, the distribution pipeline crosses the air inlet manifold along the interval direction of a plurality of air inlet channels; at least one vent hole is formed on each air inlet channel.

In one possible implementation, the vent hole is disposed near an air outlet end of the intake manifold.

In some embodiments, a pressure maintaining valve is disposed in each of the vent holes.

In one possible implementation, the distribution line includes:

the limiting plate is of a long strip-shaped structure and is used for being welded and fixed on the top wall of the intake manifold; the limiting plate is provided with a long-strip-shaped limiting groove, and the plurality of vent holes are correspondingly positioned in the limiting groove; and

and the pipe shell is connected with the limiting plate and covers the limiting groove.

In a possible embodiment, a line connection is connected to the distribution line, which line connection is intended to be connected to the crankcase ventilation line.

In some embodiments, a pressure maintaining valve is disposed in the line connection or in the vent.

The utility model provides a crankcase ventilation system's air intake structure's beneficial effect lies in: compared with the prior art, the air inlet structure of the crankcase ventilation system of the utility model has the advantages that the distribution pipeline is respectively communicated with the crankshaft ventilation pipeline and the air inlet manifold, and blow-by gas flows into the distribution pipeline through the crankshaft ventilation pipeline and then enters the air inlet manifold; because the distribution pipeline is arranged on the outer wall of the air inlet manifold and is communicated with the air inlet channel through the vent hole, blow-by gas can directly enter the air inlet channel to participate in combustion, and the phenomenon that water vapor is condensed into frost on the inner wall at the inlet end of the air inlet manifold is avoided, so that the phenomenon that the periphery of the throttle valve plate is frozen is avoided.

The utility model also provides an engine, including foretell crankcase ventilation system's air inlet structure.

The utility model also provides an automobile, including foretell engine.

The utility model provides an engine and car owing to adopted foretell crankcase ventilation system's air intake structure for the blowby gas can directly get into the intake duct behind the distribution pipeline, no longer with intake manifold's inner wall and cold air contact, avoid vapor precondensation knot, thereby avoided the peripheral phenomenon of freezing of throttle valve plate.

Drawings

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

FIG. 1 is an exploded view of an air intake structure of a crankcase ventilation system according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an air intake structure of a crankcase ventilation system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an air intake structure of a crankcase ventilation system according to an embodiment of the present invention (arrows indicate the direction of blow-by gas flow);

FIG. 4 is an air intake schematic of a prior art crankshaft ventilation system (arrows indicate the direction of blow-by gas flow).

In the figure: 1. an intake manifold; 11. a vent hole; 2. a distribution line; 21. a limiting plate; 211. a limiting groove; 22. a pipe shell; 23. a pipe joint; 3. an air inlet channel; 4. a throttle valve.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 3 together, an air intake structure of a crankcase ventilation system according to the present invention will now be described. The air intake structure of the crankcase ventilation system comprises an air intake manifold 1 and a distribution pipeline 2. A plurality of inlet channels 3 are formed on the inlet manifold 1, wherein a vent hole 11 is formed on at least one inlet channel 3; the distribution pipeline 2 is arranged on the intake manifold 1 and is communicated with the intake passage 3 through a vent hole 11; the distribution line 2 is also intended to be connected to a crankcase ventilation line. The crankcase ventilation line is for receiving blow-by gas.

The intake manifold 1 is a common intake manifold 1 structure in the prior art, and has an intake end and a plurality of outlet ends, the intake end is connected with the throttle valve 4, and the outlet end is communicated with the cylinder. Crankcase ventilation lines are also common in the art. The crankcase ventilation pipeline is connected with the oil-gas separator.

The distribution pipeline 2 has a plurality of arrangement modes on the intake manifold 1, can be arranged on the outer wall of one of the intake channels 3 and only communicated with the intake channel 3, and also can be arranged on the outer walls of at least two or all of the intake channels 3, each intake channel 3 is provided with a vent hole 11, and the distribution pipeline 2 is respectively communicated with each intake channel 3. The distribution pipe 2 may be fixed to the top, side or bottom wall of the intake manifold 1. The present embodiment does not limit the specific arrangement and the specific communication manner of the distribution pipe 2, as long as the distribution pipe 2 communicates with the intake manifold 1.

It should be noted that the vent holes 11 are not too large and are much smaller relative to the inner diameter of the manifold to avoid air leakage.

The communication between the intake manifold 1 and the distribution pipeline 2 is realized by the way of arranging the vent holes 11, other components are not additionally arranged, other changes to the intake manifold 1 are not needed, the realization way is simple, the flow path of blow-by gas in the intake manifold 1 is shortened, and the blow-by gas can be further ensured to directly enter the air inlet 3.

Compared with the prior art, the air inlet structure of the crankcase ventilation system provided by the utility model has the advantages that the distribution pipeline 2 is respectively communicated with the crankshaft ventilation pipeline and the air inlet manifold 1, and blow-by gas flows into the distribution pipeline 2 through the crankshaft ventilation pipeline and then enters the air inlet manifold 1; because the distribution pipeline 2 is arranged on the outer wall of the intake manifold 1 and is communicated with the intake passage 3 through the vent hole 11, blow-by gas can directly enter the intake passage 3 to participate in combustion, the phenomenon that water vapor is condensed into frost on the inner wall at the inlet end of the intake manifold 1 is avoided, and the phenomenon that the periphery of the valve plate of the throttle valve 4 is iced is avoided.

In some embodiments, the specific installation position of the distribution pipeline 2 can adopt the structure shown in fig. 1 and 2. Referring to fig. 1 and 2, a distribution pipe 2 is provided on a top wall of an intake manifold 1. The blow-by gas enters the intake manifold 1 from top to bottom in the distribution pipeline 2, which conforms to the natural flow law of gas and is convenient for realizing the assembly of the distribution pipeline 2.

Preferably, the distribution line 2 crosses the intake manifold 1 in the direction of the interval of the plurality of intake ports 3. The distribution pipeline 2 crosses the distribution pipeline 2 pointed on the intake manifold 1 and is connected with the outer wall of each intake channel 3, at least one vent hole 11 is formed on each intake channel 3, that is, the distribution pipeline 2 is respectively communicated with each intake channel 3. Preferably, the number of the vent holes 11 on each inlet 3 is the same, and the size is the same, so as to ensure that the flow rate of the blow-by gas entering each inlet 3 is the same.

The distribution pipeline 2 is communicated with each air inlet 3 respectively, and the flow rate and the flow speed of blow-by gas can be increased, so that the gas can rapidly enter the air inlet 3 to participate in combustion. In order to stabilize the pressure of the blow-by gas entering the intake passage 3, a pressure stabilizing valve is provided in each vent hole 11.

Preferably, the vent hole 11 is disposed near the outlet end of the intake manifold 1 to avoid the blow-by gas from being near the inlet end of the intake manifold 1, so that the blow-by gas can directly enter the intake passage 3 to participate in combustion.

In some embodiments, the dispensing line 2 may be configured as shown in FIG. 2. Referring to fig. 2, the dispensing line 2 comprises a limit plate 21 and a cartridge 22. The limiting plate 21 is of a long strip-shaped structure and is used for being welded and fixed on the top wall of the intake manifold 1; the limiting plate 21 is provided with a strip-shaped limiting groove 211, and the plurality of vent holes 11 are correspondingly positioned in the limiting groove 211; the pipe shell 22 is connected with the limit plate 21 and covers the limit groove 211.

The limiting plate 21 crosses the intake manifold 1 along the pipeline spacing direction of the intake manifold 1, the extending direction of the limiting groove 211 is the same as that of the limiting plate 21, the width of the limiting groove 211 is the same as the caliber of the vent hole 11, and the limiting plate 21 is used for positioning the vent holes 11 so that the vent holes 11 only face the pipe shell 22.

The pipe shell 22 is buckled on the limiting plate 21 and is used for sealing the limiting groove 211 and the plurality of vent holes 11 to form edge sealing. The pipe shell 22 and the limiting plate 21 can be fixed by welding or by detachable connection, such as bolt connection or clamping connection.

In some embodiments, the distribution line 2 may be connected to the crankcase ventilation line using the structure shown in fig. 1 and 2. Referring to fig. 1 and 2, a line connection 23 is connected to the distribution line 2, the line connection 23 being intended for connection to a crankcase ventilation line. Preferably, the line junction 23 is provided at a central portion in the extending direction of the distribution line 2.

Since the distribution pipe 2 is disposed on the outer wall of the intake manifold 1 and is also communicated with the intake manifold 1, it is preferable to assemble the distribution pipe 2 by welding it to the intake manifold 1. The crankcase ventilation line is a separate line connecting the crankcase and the gas-oil separator, so that the crankcase ventilation line and the distribution line 2 can be connected by the line connector 23 to achieve quick connection.

In some embodiments, in addition to a pressure stabilizing valve for stabilizing the pressure of the blow-by gas flowing in each vent hole 11, a pressure stabilizing valve may be directly provided in the pipeline joint 23 to stabilize the blow-by gas pressure directly entering the distribution pipeline 2, so that the blow-by gas is not required to be installed in each vent hole 11, and the cost is reduced.

Based on the same inventive concept, the embodiment of the application also provides an engine, which comprises the air inlet structure of the crankcase ventilation system.

In addition, this application embodiment still provides an automobile, includes above-mentioned engine.

The utility model provides an engine and car is owing to adopted foretell crankcase ventilation system's air intake structure for the blowby gas can directly get into the intake duct 3 of cylinder behind distribution pipeline 2, no longer with intake manifold 1's inner wall and cold air contact, avoid vapor precondensation knot, thereby avoided the peripheral phenomenon of freezing of throttle 4 valve plates.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An air intake structure of a crankcase ventilation system, comprising:

2. The intake structure of a crankcase ventilation system according to claim 1 wherein said distribution conduit is disposed in a top wall of said intake manifold.

3. The intake structure of a crankcase ventilation system according to claim 1 wherein said distribution conduit extends across said intake manifold in a direction spaced from a plurality of said intake passages; at least one vent hole is formed on each air inlet channel.

4. The intake structure of a crankcase ventilation system according to claim 3 wherein said breather hole is disposed proximate an outlet end of said intake manifold.

5. The intake structure of a crankcase ventilation system according to claim 3 wherein a pressure maintaining valve is provided in each of said breather holes.

6. The intake structure of a crankcase ventilation system according to claim 3 wherein said distribution conduit comprises:

7. The intake structure of a crankcase ventilation system according to claim 1 wherein a conduit connection is connected to said distribution conduit, said conduit connection adapted to be connected to said crankcase ventilation conduit.

8. The intake structure of a crankcase ventilation system according to claim 7 wherein a pressure maintaining valve is provided in said conduit fitting or in said breather hole.

9. An engine comprising the air intake structure of the crankcase ventilation system according to any one of claims 1 to 8.

10. An automobile comprising the engine of claim 9.