WO2019080816A1

WO2019080816A1 - Intake manifold having crankcase ventilation gas sub-chamber and engine

Info

Publication number: WO2019080816A1
Application number: PCT/CN2018/111299
Authority: WO
Inventors: 龙彪; 黄英铭; 陈良; 占文峰
Original assignee: 广州汽车集团股份有限公司
Priority date: 2017-10-23
Filing date: 2018-10-22
Publication date: 2019-05-02
Also published as: CN107905924B; CN107905924A

Abstract

An intake manifold having a crankcase ventilation gas sub-chamber, comprising a pressure-stabilizing chamber (1) and multiple air channels (2) in communication with the pressure-stabilizing chamber (1), the pressure-stabilizing chamber (1) having disposed thereon an air inlet (11) in communication with the air channels (2), an end of an air channel (2) being provided with a flange (3) connected to an engine cylinder head, an end surface of the flange (3) having disposed thereon an air outlet (7) corresponding to each air channel (2), an inner part of the flange (3) being provided with a crankcase ventilation gas sub-chamber (4) and a flow guide channel (43), the flange (3) having provided therein a crankcase ventilation gas inlet (41) corresponding to a crankcase gas output opening of the engine cylinder head and in communication with the crankcase ventilation gas sub-chamber (4), and a side wall of each air channel (2) having provided thereon a crankcase ventilation gas outlet (42) putting the air channel and the crankcase ventilation gas sub-chamber in communication. The present intake manifold flange can use high temperature transferred by an engine cylinder head to heat crankcase ventilation gas, and can effectively limit crankcase ventilation gas entering an air channel and condensing into water droplets after mixing with intake airflow, preventing throttle icing, crankcase ventilation pipe blockage or intake pipe blockage.

Description

Intake manifold and engine with crankcase ventilation gas sub-cavity

Technical field

The present invention relates to the field of automotive engines, and more particularly to an intake manifold and an engine having a crankcase ventilation gas sub-chamber.

Background technique

In today's engines, the crankcase ventilation gas is generally drained to the intake line, one of which is directly introduced into the intake manifold, and the intake airflow in the intake manifold enters the airway combustion chamber. Under normal circumstances, the crankcase ventilation gas and the intake airflow temperature are higher than zero degrees, and the crankcase ventilation gas will enter the cylinder head air passage and the combustion chamber to burn with the intake airflow in the intake manifold; but in the alpine region (such as - 10 ° C ~ -40 ° C), because the intake air temperature in the intake manifold is lower than zero, the crankcase ventilation gas enters the intake manifold and mixes with the low temperature gas therein, the temperature is reduced, even below zero, which contains The water vapor will condense into water droplets or even freeze, causing the throttle to freeze, the curved line blocked or the intake line blocked, affecting the normal operation of the engine.

Summary of the invention

It is an object of the present invention to provide an intake manifold or a curved passage that can effectively limit the generation of condensed water when the crankcase ventilation gas is mixed with the low temperature intake airflow in the intake manifold, while preventing the condensed water from clogging the intake duct. This ensures that the engine will operate normally in the cold regions.

In order to solve the above problems, the present invention provides an intake manifold having a crankcase ventilation gas sub-chamber, comprising a voltage stabilization chamber and a plurality of air passages communicating with the voltage stabilization chamber, wherein the voltage regulation chamber is provided An air inlet communicating with the air passage, the end of the air passage is provided with a flange connected to the engine cylinder head, and an end surface of the flange is provided with an air outlet corresponding to each air passage, the method The interior of the blue is provided with a crankcase ventilation gas sub-chamber, and the flange is provided with a curved gas inlet corresponding to the crankcase gas outlet of the engine cylinder head and communicating with the crankcase ventilation gas sub-chamber, Each of the air passages is provided with a curved gas outlet for communicating the air passage and the crankcase ventilation gas sub-chamber.

Preferably, the number of air passages is four, which are respectively one, two, three, four cylinder air passages arranged in sequence; between the one cylinder air passage and the two cylinder air passage and the three cylinder air passage and Two four-cylinder air passages are respectively provided with two flow guiding channels of substantially the same shape; the curved air outlets of the one-cylinder air passage and the two-cylinder air passage, and the three-cylinder air passage and the four-cylinder air passage The Qutong gas outlets are symmetrically disposed, and one of the flow guiding passages is correspondingly connected to a curved gas outlet.

Preferably, an integral open slot is hollowed inwardly along the sidewall of the flange, the open slot of the open slot is covered with a cover plate, a cylinder air passage and a two-cylinder air passage, and three A baffle is disposed between the cylinder air passage and the four-cylinder air passage, and the baffle plate is located at a portion between the one-cylinder air passage and the two-cylinder air passage and the three-cylinder air passage and the four-cylinder air The portions between the tracks are each divided into two of the flow guiding channels.

Preferably, the baffles are respectively located between a cylinder air passage and a two-cylinder air passage and an intermediate position between the three-cylinder air passage and the four-cylinder air passage, and two separated by each of the deflectors The flow guiding channels are substantially symmetrical.

Preferably, the curved gas inlet is located in the middle of the crankcase ventilation gas sub-chamber, the curved gas outlet on the one-cylinder air passage and the two-cylinder air passage, and the curved on the three-cylinder air passage and the four-cylinder air passage. The through gas outlet is substantially symmetrical about the curved gas inlet.

Preferably, the first, second, third and fourth cylinder air passages are arranged in parallel along the length direction of the voltage stabilizing chamber, and the curved gas inlet is located between the two cylinder air passage and the three cylinder air passage. The gas passages are respectively located on the side wall adjacent to the two-cylinder air passage and the two-cylinder air passage and the side wall adjacent to the four-cylinder air passage.

Preferably, the air inlet is disposed in a middle portion of the voltage stabilizing cavity, and an air intake direction of the air inlet is substantially perpendicular to an air outlet direction of the air outlet.

Preferably, the two ends of the curved gas sub-cavity respectively stop inside the one-cylinder air passage and the four-cylinder air passage, and the two ends of the curved gas sub-chamber are respectively provided with the flow guiding passage.

In order to solve the same problem, the present invention also provides an engine comprising the intake manifold having a crankcase ventilation gas sub-chamber of any of the above aspects.

The intake manifold of the crankcase ventilation gas sub-cavity of the invention has a crankcase ventilation gas sub-cavity and a diversion passage inside the flange connected to the engine cylinder head at the end of the air passage, and the crankcase ventilation gas can pass the Qutong The gas inlet flows into the crankcase ventilation gas sub-cavity and flows into the air passage through the Qutong gas outlet. Since the cylinder head of the engine is generally at a relatively high temperature, the high temperature is transmitted to the flange to ventilate the gas in the gas sub-chamber of the crankcase. Heating can effectively restrict the crankcase ventilation gas from entering the airway and mixing with the intake airflow to condense into water droplets and even freeze, which can effectively prevent the throttle from freezing, the curve of the curved passage or the blockage of the intake pipeline. In order to ensure that the engine can also operate normally in the cold regions.

DRAWINGS

1 is a side view showing the structure of an intake manifold having a crankcase ventilation gas sub-chamber according to a preferred embodiment of the present invention;

2 is a cross-sectional view of the A-A section of the intake manifold of the intake manifold having the crankcase ventilation gas sub-chamber shown in FIG.

Among them, 1, voltage regulator; 11, air inlet; 2, air passage; 21, one cylinder air passage; 22, two cylinder air passage; 23, three cylinder air passage; 24, four cylinder air passage; Blue; 4, crankcase ventilation gas sub-cavity; 41, Qutong gas inlet; 42, Qutong gas outlet; 43, flow guiding channel; 44, open slot; 5, cover plate; 6, deflector; Air port.

Detailed ways

The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

1 and 2, an intake manifold having a crankcase ventilation gas sub-chamber including an oscillating chamber 1 and a plurality of communicating with the plenum chamber 1 is schematically shown in the embodiment of the present invention. Air passage 2, the plenum chamber 1 is provided with an air inlet 11 communicating with the air passage 2, and the end of the air passage 2 is provided with a flange 3 connected to the engine cylinder head, and the end face of the flange 3 is provided with each The air outlet 2 corresponds to the air outlet 7, the inside of the flange 3 is provided with a crankcase ventilation gas sub-cavity 4 and a flow guiding passage 43, and the flange 3 is further provided with a crankcase gas outlet corresponding to the engine cylinder head, and A curved gas inlet 41 communicating with the crankcase ventilation gas sub-chamber 4 is provided with a curved gas outlet 42 for communicating the air passage with the crankcase ventilation gas sub-chamber 4 on the side wall of each air passage 2.

In an intake manifold having a crankcase ventilation gas sub-cavity according to an embodiment of the present invention, the crankcase ventilation gas may flow into the crankcase ventilation gas sub-chamber 4 through the curved gas inlet 41 under the action of a negative pressure, and through the flow guiding passage 43 Leading to the Qutong gas outlet 42 into the airway 2; when the engine is working in an alpine region, the intake airflow temperature in the airway is relatively low, and the engine cylinder head is generally at a higher temperature, and the flange 3 In contact with the engine cylinder head, the high temperature of the engine cylinder head can be directly transmitted to the flange 3. Since the crankcase ventilation gas sub-cavity 4 is located in the flange 3, the gas in the crankcase ventilation gas sub-chamber 4 is in contact with the flange 3. More adequately, therefore, the high temperature conducted to the flange 3 can sufficiently heat the gas in the crankcase ventilation gas sub-cavity 4, effectively limiting the condensation of gas in the crankcase ventilation gas sub-chamber 4, thereby effectively limiting the crankshaft The box ventilation gas is merged into the air passage 2 and mixed with the low-temperature intake air stream to condense into water droplets, and even freezes, effectively preventing the condensed water from flowing back, causing the throttle to freeze and the crankcase ventilation line to be blocked. Intake line blockage occurs, in order to ensure that the engine is also able to function properly in the alpine region.

Referring to FIG. 2, the number of air passages 2 of the intake manifold having the crankcase ventilation gas sub-chamber of the embodiment of the present invention is four, which are respectively a cylinder air passage 21 and a two-cylinder air passage 22 which are sequentially disposed. a three-cylinder air passage 23 and a four-cylinder air passage 24, the crankcase ventilation gas sub-chamber 4 is located between the one-cylinder air passage 21 and the two-cylinder air passage 22, and between the three-cylinder air passage 23 and the four-cylinder air passage The portions between the two form substantially the same shape of the flow guiding passages 43; the curved air outlets 42 of the one-cylinder air passage 21 and the two-cylinder air passage 22, and the curved gas of the three-cylinder air passage 23 and the four-cylinder air passage 24; The outlets 42 are respectively symmetrically disposed, and one of the flow guiding passages 43 is correspondingly communicated with a curved gas outlet 42; the gas in the crankcase ventilation gas sub-chamber 4 is branched through the flow guiding passage 43 to the corresponding curved gas outlet 42 and then passed through The curved gas outlet 42 merges into the air passage 2, and since the shape of the flow guiding passage 43 is substantially the same, the curved air outlet 42 of the one cylinder air passage 21 and the two cylinder air passage 22, and the three cylinder air passage 23 and the four cylinder gas The curved gas outlets 42 of the passage 24 are symmetrically arranged, respectively, so that the gas of the crankcase ventilation gas sub-chamber 4 can Evenly split to each of the airway 2, to ensure that each cylinder of the engine intake and combustion uniformity, to improve the stability of engine operation.

Referring to FIG. 2, the crankcase ventilation gas sub-chamber 4 in the flange 3 can be formed by hollowing out an integral opening groove 44 in the flange 3 along its side wall, the opening groove 44. The cover is covered (welded or flanged) with a cover 5, and a guide between the adjacent one-cylinder air passage 21 and the two-cylinder air passage 22 and between the three-cylinder air passage 23 and the four-cylinder air passage 24 are respectively provided. The flow plate 6, the deflector 6 divides the portion of the open groove 44 between the one-cylinder air passage 21 and the two-cylinder air passage 22 and the portion between the three-cylinder air passage 23 and the four-cylinder air passage 24 into two diversions Channel 43; such an arrangement facilitates the intake manifold to be integrally formed by casting. During the formation of the intake manifold, the opening groove 44, the flow guiding passage 43 and the deflector 6 can be integrally formed together with the intake manifold. Then, the cover plate 5 is welded to the opening of the open groove 44 by welding to form a complete crankcase ventilation gas sub-cavity 4; thus, the production process of the intake manifold can be simplified, and the intake manifold can be improved. Productivity.

Preferably, the baffle 6 is located between the one-cylinder air passage 21 and the two-cylinder air passage 22 and between the three-cylinder air passage 23 and the four-cylinder air passage 24, two of which are separated by each of the baffles 6. The flow guiding passage 43 is substantially symmetrical; so that the gas of the crankcase ventilation gas sub-cavity 4 can be uniformly shunted into each air passage.

Referring to FIG. 2, the Qutong gas inlet 41 is located in the middle of the crankcase ventilation gas sub-chamber 4, that is, between the three-cylinder air passage 23 and the four-cylinder air passage 24, and is located in a cylinder air passage 21 and two cylinders. The curved gas outlet 42 on the air passage 22 is substantially symmetrical with respect to the curved gas inlet 41 on the three-cylinder air passage 23 and the four-cylinder air passage 24; such a layout ensures the crankcase ventilation gas sub-chamber The gas splitting in 4 is relatively balanced, and the uniformity of the gas in each air passage is affected by the uneven distribution of the Qutong gas.

Preferably, the air inlet 11 is disposed in the middle of the tempering chamber 1, and the intake direction of the air inlet 11 is substantially perpendicular to the air outlet direction of the air outlet 21; such a structural layout facilitates the intake manifold and the throttle and the engine cylinder head Connected, the air inlet 11 is arranged in the middle of the tempering chamber 1, which can ensure that the intake air flow in the tempering chamber 1 is relatively evenly distributed to each air passage to ensure the stability of the engine operation.

Referring to FIG. 2, the curved gas inlet 41 is located in the middle of the crankcase ventilation gas sub-chamber 4, and the curved gas outlet 42 is evenly distributed on both sides of the curved gas inlet 41 to facilitate uniform distribution of the curved gas. Specifically, the one-cylinder air passage 21, the two-cylinder air passage 22, the three-cylinder air passage 23, and the four-cylinder air passage 24 are arranged in parallel along the length direction of the surge tank 1, and the curved gas inlet 41 is located in a cylinder air passage. Between 21 and the two-cylinder air passage 22, the curved gas outlets 42 are respectively located on the side walls adjacent to the two-cylinder air passages 22 and the two-cylinder air passages 22 and the side adjacent to the four-cylinder air passages 24 and the four-cylinder air passages On the wall.

Referring to FIG. 2, the two ends of the curved gas sub-chamber 4 are respectively stopped inside the one-cylinder air passage 21 and the four-cylinder air passage 24. The two ends of the curved gas sub-chamber 4 are respectively provided with a flow guiding passage 43. .

When the engine is running in an alpine region, if liquid water has formed in the crankcase ventilation gas sub-chamber 4 and floods the lower end of the baffle 6, it can pass through both ends of the Qutong gas sub-chamber 4 and a cylinder air passage 21 and four. The flow guiding passages 43 connected to the cylinder air passages 24 are respectively sucked into the one-cylinder air passage 21 and the four-cylinder air passages 24, and ensure that the condensed water does not flood the lower end of the deflector 6, ensuring that the guiding passages 43 can smoothly guide the airflow; When the engine is started in an alpine region, if condensed water accumulates or freezes on the cover plate 5, the flow passages 43 connected to the one-cylinder air passage 21 and the four-cylinder air passage 24 at both ends of the curved gas sub-chamber 4 are blocked. The gas in the crankcase ventilation gas sub-chamber 4 can also be diverted to the corresponding curved gas outlet 42 through the flow guiding passage 43 connected to the two-cylinder air passage 22 and the three-cylinder air passage 23, and then passed through the curved gas outlet 42. Imported into the two-cylinder air passage 22 and the three-cylinder air passage 23 to ensure that the pressure in the crankcase is maintained within a relatively stable range; meanwhile, the cylinder head of the engine is transmitted to the high-temperature meltable cover 5 of the flange 3 Solid ice formed on the upper end, and finally through the ends of the Qutong gas sub-cavity 4 Airway cylinder 21 connected to the airway and 24 drawn into the flow passage 43 a cylinder 21 and the cylinder air passage 24 of airway, ensuring unimpeded flow channel 43 can guide the airflow.

In summary, the intake manifold of the crankcase ventilation gas sub-chamber of the present invention is provided with a crankcase ventilation gas sub-cavity 4 inside the flange 3 at the end of the air passage, and the crankcase ventilation gas sub-chamber 4 The gas is sufficiently in contact with the flange 3, and therefore, the high temperature conducted to the flange 3 can sufficiently heat the gas in the crankcase ventilation gas sub-chamber 4, thereby effectively restricting the crankcase ventilation gas from entering the air passage 2 The medium is mixed with the low-temperature intake air stream to condense into water droplets, and even freezes, effectively preventing the condensate returning to cause the throttle to freeze, the crankcase ventilation line to be blocked or the intake line to be blocked, so as to ensure that the engine is in an alpine region. It also works fine.

Further, since the shapes of the flow guiding passages 43 are substantially the same, the curved gas outlets 42 between the one-cylinder air passage 21 and the two-cylinder air passage 22 and between the three-cylinder air passage 23 and the four-cylinder air passage 24 are symmetrically arranged, so that the crankshaft The gas of the box ventilation gas sub-cavity 4 can be uniformly distributed into each air passage 2 to ensure the uniformity of the engine intake and combustion and improve the stability of the engine operation.

In order to solve the same problem, the present invention also provides an engine comprising the intake manifold having a crankcase ventilation gas sub-chamber of any of the above embodiments.

The above is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims

An intake manifold having a crankcase ventilation gas sub-chamber, comprising: a voltage stabilization chamber and a plurality of air passages communicating with the voltage stabilization chamber, wherein the voltage regulation chamber is provided with the air passage a communicating air inlet, the end of the air passage is provided with a flange connected to the engine cylinder head, and an end surface of the flange is provided with an air outlet corresponding to each air passage, and the inside of the flange is provided a crankcase ventilation gas sub-chamber, wherein the flange is provided with a curved gas inlet corresponding to a crankcase gas outlet of the engine cylinder head and communicating with the crankcase ventilation gas sub-chamber, each of the air passages Each of the side walls is provided with a curved gas outlet for communicating the air passage and the crankcase ventilation gas sub-chamber.
The intake manifold having a crankcase ventilation gas sub-cavity according to claim 1, wherein the number of the air passages is four, which are respectively one, two, three, four cylinder air passages;

Between the one-cylinder air passage and the two-cylinder air passage and between the three-cylinder air passage and the four-cylinder air passage, two flow guiding channels having substantially the same shape are respectively disposed;

The curved air outlet of the one-cylinder air passage and the two-cylinder air passage and the curved gas outlet of the three-cylinder air passage and the four-cylinder air passage are symmetrically arranged, and one flow guiding passage is correspondingly connected with a curved gas outlet. .
The intake manifold having a crankcase ventilation gas sub-chamber according to claim 2, wherein an integral open groove is hollowed inwardly along the side wall of the flange, the opening of the open slot The upper cover is provided with a cover plate, and a baffle is disposed between the one-cylinder air passage and the two-cylinder air passage and between the three-cylinder air passage and the four-cylinder air passage, and the baffle plate places the open slot in a cylinder The portion between the air passage and the two-cylinder air passage and the portion between the three-cylinder air passage and the four-cylinder air passage are each divided into two of the flow guiding passages.
The intake manifold having a crankcase ventilation gas sub-chamber according to claim 3, wherein the deflector is located between a cylinder air passage and a two-cylinder air passage, and a three-cylinder air passage and a four cylinder The intermediate position between the air passages is substantially symmetrical by the two flow guiding passages separated by each of the baffles.
An intake manifold having a crankcase ventilation gas sub-chamber according to claim 2 or 3, wherein said curved gas inlet is located in the middle of said crankcase ventilation gas subchamber, in a cylinder air passage and The curved gas outlet on the two-cylinder air passage is substantially symmetrical with respect to the curved gas inlet at the three-cylinder air passage and the four-cylinder air passage.
The intake manifold having a crankcase ventilation gas sub-cavity according to claim 5, wherein the one, two, three, and four cylinder air passages are arranged in parallel along the length direction of the voltage stabilizing chamber, The curved gas inlet is located between the two-cylinder air passage and the three-cylinder air passage, and the curved gas outlet is respectively located on a side wall adjacent to the two-cylinder air passage and the two-cylinder air passage and the four-cylinder air passage and the four-cylinder On the adjacent side walls of the airway.
An intake manifold having a crankcase ventilation gas sub-chamber according to claim 1 or 2 or 3, wherein said intake port is disposed in a middle portion of said surge tank, said intake port being advanced The gas direction is substantially perpendicular to the gas outlet direction of the gas outlet.
The intake manifold having a crankcase ventilation air sub-chamber according to claim 2 or 3, wherein both ends of the curved gas sub-chamber are respectively stopped in a cylinder air passage and a four cylinder air passage. On the inner side, the two ends of the curved gas sub-cavity are respectively provided with the flow guiding channel.
An engine characterized by comprising an intake manifold having a crankcase ventilation gas sub-chamber as claimed in any one of claims 1 to 8.