JP6459498B2 - Engine intake structure - Google Patents

Description

  The present invention relates to an intake structure for an engine.

In an engine equipped with a supercharger, an intercooler that cools intake air that has been compressed by the supercharger and has reached a high temperature is provided in the intake passage.
The intercooler that cools the intake air with the traveling wind must be placed at a location where the traveling wind passes. Therefore, the intake passage portion connected to the intercooler becomes long, so that the response of the engine when the accelerator is depressed is reduced, and there is a disadvantage that the intake passage portion occupies a large space.
Thus, Patent Document 1 proposes a technique in which an intake passage connected to the intercooler is shortened by using an intercooler that cools intake air using cooling water.

JP 2014-51907 A

By the way, in the intercooler that cools the intake air, condensed water is generated by condensation of moisture contained in the intake air. A part of the condensed water is discharged into the cylinder of the engine together with the intake air for processing. However, if a certain amount or more of condensed water accumulates in the intake passage, the cross-sectional area of the intake passage decreases or the condensed water flows into the cylinder. However, it causes misfire, resulting in a decrease in engine output.
Therefore, it is conceivable to provide a condensed water separator on the downstream side of the intercooler for separating and discharging condensed water droplets scattered together with the intake air.
However, since the space of the intake passage portion on the downstream side of the intercooler is occupied by the condensed water separator, there is room for improvement in reducing the space of the intake passage portion.
The present invention has been made in view of such circumstances, and an object thereof is to provide an intake structure for an engine that is advantageous in reducing the space of the intake passage portion while separating and discharging condensed water. There is to do.

In order to achieve the above object, an invention according to claim 1 is an intake structure of an engine in which an intercooler is provided in an intake passage, and intake air of the intercooler from which intake air cooled by the intercooler is discharged. A housing that accommodates the outlet portion is provided, and an intake inlet portion of the intake passage disposed downstream of the intercooler is disposed at an upper portion inside the housing, and the intake outlet portion is the intercooler. Cooled intake air is provided so as to be discharged upward, and the intake outlet portion is provided at a position higher than the height of the intake inlet portion inside the housing. .
According to a second aspect of the invention, wherein the intercooler is an air intake which said juxtaposed to said intake air cooling passage and an intake cooling passage connected to the intake passage upstream of the intercooler through the intake air cooling path for cooling with refrigerant A refrigerant path is provided inside, and the body is provided with the intake outlet portion which is a downstream end of the intake air cooling path, and the location of the body around the intake outlet portion includes the intake outlet portion and the body. It is arrange | positioned inside the housing | casing, It is characterized by the above-mentioned.
The invention described in claim 3 is characterized in that the casing is provided with a condensed water discharge path for discharging condensed water accommodated in the casing.

According to the first aspect of the present invention, the casing functions as a condensed water separator that separates condensed water from the intake air discharged from the intercooler, and the casing includes an intake outlet portion of the intercooler and an intake inlet of the intake passage. And a small dimension sufficient to accommodate the portion.
Therefore, the space occupied by the housing is small compared with the case where the condensate separator is provided alone, which is advantageous in reducing the space in the intake passage while separating and discharging the condensate.
Further , the condensed water is more likely to adhere to the inner surface of the wall portion, which is advantageous for efficiently separating the condensed water from the intake air.
According to the second aspect of the present invention, since the intake air flowing through the inside of the housing is cooled through the body portion housed in the inside of the housing and cooled by the refrigerant, the cooling efficiency of the intake air is increased. It becomes advantageous in raising.
According to invention of Claim 3 , it becomes advantageous when discharging condensed water quickly by a condensed water discharge channel.

It is explanatory drawing which shows the structure of the engine to which the intake structure of the engine of 1st Embodiment was applied. It is explanatory drawing of the intake structure of the engine of 1st Embodiment. It is explanatory drawing of the intake structure of the engine of 2nd Embodiment. It is explanatory drawing of the intake structure of the engine of 3rd Embodiment.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the engine to which the engine intake structure of the present invention is applied will be described.
In the present embodiment, a case where the engine is a diesel engine will be described. Of course, the present invention can also be applied to a gasoline engine.

  As shown in FIG. 1, the engine 10 includes an engine body 12, an intake passage 14, an exhaust passage 16, a supercharger 18, a low pressure EGR device 20, a high pressure EGR device 22, and an intake manifold 24. It consists of

The engine body 12 includes a cylinder head 1202 and a cylinder block 1204.
A combustion chamber is formed in the cylinder head 1202, and a plurality of cylinders (cylinder chambers) that accommodate pistons are formed in the cylinder block 1204.

The intake passage 14 includes an intake passage portion of the intake pipe 1402, an intake passage portion of the intake manifold 24, and an intake port 36 of the engine body 12.
In the intake pipe 1402, an air cleaner 1410, a low-pressure throttle 1412, and a compressor 1802 are provided in this order from the upstream side to the downstream side of the intake air.
The exhaust passage 16 includes an exhaust port of the engine body 12, an exhaust passage portion of the exhaust manifold 1604, and an exhaust passage portion of the exhaust pipe 1602.
The exhaust pipe 1602 is provided with a turbine 1804 and an exhaust gas purification device 26 in this order from the upstream side to the downstream side of the exhaust.

  The supercharger 18 includes a compressor 1802 and a turbine 1804. The turbine 1804 is rotated by the energy of exhaust gas passing through the exhaust pipe 1602, and the compressor 1802 is rotated to compress the intake air in the intake pipe 1402, thereby compressing the high pressure. This is supplied to the engine body 12 as intake air.

The low pressure EGR device 20 returns the exhaust gas discharged from the exhaust gas purification device 26 to the location of the intake pipe 1402 on the upstream side of the compressor 1802 as low pressure EGR gas.
The low-pressure EGR device 20 includes a low-pressure EGR passage 2002 that recirculates the low-pressure EGR gas. In the low-pressure EGR passage 2002, foreign matter contained in the low-pressure EGR gas (welding spatter, slag, catalyst pieces, DPF pieces, etc. during exhaust system manufacturing) ), An air-cooled low-pressure EGR cooler 2006 that cools the low-pressure EGR gas, and a low-pressure EGR valve 2008 that controls the recirculation amount of the low-pressure EGR gas.

The high-pressure EGR device 22 recirculates the exhaust gas taken out from the location of the exhaust pipe 1604 upstream of the turbine 1804 to the intake manifold 24 positioned downstream of the compressor 1802 as EGR gas (high-pressure EGR gas).
The high-pressure EGR device 22 includes a high-pressure EGR passage 2202 that connects the exhaust pipe 1602 and the intake manifold 24 to recirculate EGR gas, and a high-pressure EGR valve 2204.

As shown in FIG. 2, the intake structure of the engine of the present embodiment includes an intercooler 34 provided in the intake passage portion of the intake pipe 1402 and a housing 44 that houses the intake outlet portion 40 of the intercooler 34. It is configured to include.
In the present embodiment, the intercooler 34 is provided between the downstream end of the intake pipe 1402 and the intake manifold 24.
In the drawing, the arrow UP indicates the upper side of the vehicle, and the arrow DOWN indicates the lower side of the vehicle.
Reference numeral 46 in the drawing denotes an opening of an intake port that is formed in the cylinder head 1202 and communicates with each cylinder.

The intercooler 34 cools the intake air that has been compressed by the supercharger 18 and has reached a high temperature. In the present embodiment, the intercooler 34 cools the intake air using a refrigerant.
The intercooler 34 includes a body 36.
An intake inlet portion 38 that is connected to the downstream end of the intake pipe 1402 and that introduces intake air is provided at the lower portion of the body 36, and an intake outlet portion 40 that discharges the intake air cooled by the intercooler 34 is provided at the upper portion of the body 36. It has been.
In the present embodiment, the intake outlet 40 is provided so that the intake air cooled by the intercooler 34 is discharged upward.

A cooling section 42 is provided between the intake inlet section 38 and the intake outlet section 40.
The cooling unit 42 includes a plurality of intake air cooling paths 42A extending in the vertical direction, and a plurality of refrigerant paths 42B that are arranged in parallel with the plurality of intake air cooling paths 42A and perform heat exchange between the intake air and the refrigerant, The intake air flows through the intake air cooling path 42A while being cooled by the refrigerant.
In the present embodiment, cooling water is used as the refrigerant. As shown in FIG. 1, the cooling water is supplied from the radiator 28 to the refrigerant path 42B via the cooling water path 32 by the electric water pump 30, and the refrigerant path 42B. The cooling water that has passed through is circulated to the radiator 28 via the cooling water passage 32 and is circulated between the radiator 28 and the refrigerant path 42B. Thereby, the intake air flowing through the intake air cooling passage 42A is cooled by the plurality of refrigerant passages 42B.
Of course, various refrigerant gases and coolants known in the art other than the cooling water may be used as the refrigerant.
Further, as the structures of the intake cooling path 42A and the refrigerant path 42B, various conventionally known structures of the intake cooling path 42A and the refrigerant path 42B can be employed.
In addition, the intercooler 34 may be an air-cooled type that cools intake air with traveling wind.

The housing 44 accommodates the intake outlet portion 40 of the intercooler 34.
The housing 44 includes a bottom wall 4402, a side wall 4404 erected from the periphery of the bottom wall 4402, and an upper wall 4406 that connects the upper part of the side wall 4404.
An opening 4410 is provided from the bottom wall 4402 to the side wall 4404 of the housing 44, from which the intake outlet portion 40 of the intercooler 34 and the body 36 around the intake outlet portion 40 are inserted into the inside of the housing 44. The opening 4410 and the body 36 are liquid-tightly connected.
In addition, a condensed water discharge path 48 for discharging condensed water accommodated in the inside of the housing 44 is connected to the lower portion of the housing 44.
In addition, a plurality of baffle plates 50 are provided at an intermediate portion in the height direction of the housing 44 inside the housing 44 with the thickness direction directed in the vertical direction and spaced apart in the vertical direction. Thus, the condensed water accommodated in the lower portion of the housing 44 is prevented from moving in a direction toward the intake inlet 58 of the high-pressure throttle 52 described later.

A high-pressure throttle 52 is provided on the upper portion of the housing 44.
The high pressure throttle 52 adjusts the amount of intake air supplied to the intake manifold 24.
The high-pressure throttle 52 includes a body 54 provided with an intake passage portion and a valve body 56 provided on the body 54 for opening and closing the intake passage portion.
The intake inlet portion 58 of the intake passage portion of the high pressure throttle 52 is housed inside the housing 44, and the intake outlet portion 60 of the intake passage portion of the high pressure throttle 52 is located outside the housing 44 and is located in the intake manifold 24. It is connected to the upstream end.
Therefore, in the present embodiment, the intake inlet portion of the intake passage 14 disposed downstream of the intercooler 34 is constituted by the intake inlet portion 58 of the high-pressure throttle 52 and is located inside the housing 44.
In the present embodiment, the intake air outlet portion 40 of the intercooler 34 is provided at a position higher than the height of the intake air inlet portion 58 of the high pressure throttle 52 (the intake air inlet portion of the intake passage 14) inside the housing 44. It has been.

Next, the function and effect will be described.
As indicated by arrows in FIG. 2, during operation of the engine 10, intake air is introduced into the intercooler 34 via the intake pipe 1402, and the upper wall that is the wall portion of the housing 44 from the intake outlet portion 40 of the intercooler 34. 4406, the side wall 4404, and the bottom wall 4402 are introduced into the intake manifold 24 through the intake inlet 58 and the intake outlet 60 of the high-pressure throttle 52 while bypassing inside the housing 44.
Condensed water generated when the intake air is cooled by the intercooler 34 becomes fine water droplets due to the flow of the intake air, and flows inside the housing 44 together with the intake air.
Therefore, the condensed water is separated from the intake air by hitting the wall portion of the housing 44 together with the intake air and adhering to the inner surface of the wall portion. The condensed water adhering to the inner surface of the wall portion flows down by gravity and is stored in the lower portion of the housing 44. The condensed water accommodated in the lower part of the housing 44 is discharged outside the vehicle through the condensed water discharge path 48.

According to the present embodiment, the housing 44 functions as a condensed water separator that separates condensed water from the intake air discharged from the intercooler 34.
The housing 44 can be of a size small enough to accommodate the intake outlet portion 40 of the intercooler 34 and the intake inlet portion 58 of the high-pressure throttle 62.
Therefore, the space occupied by the housing 44 is small compared with the case where the condensate separator is provided alone, which is advantageous in reducing the space in the intake passage while separating and discharging the condensate.

Further, in the present embodiment, the intake outlet portion 40 of the intercooler 34 is provided so that the intake air cooled by the intercooler 34 is discharged upward, and the intake outlet portion 40 of the intercooler 34 is provided with the housing 44. Is provided at a location higher than the intake inlet 58 of the high pressure throttle 52.
Therefore, the intake air discharged from the intake outlet portion 40 of the intercooler 34 into the housing 44 is largely bypassed inside the housing 44 and introduced into the intake inlet portion 58 of the high-pressure throttle 52. Therefore, the intake air flowing through the inside of the housing 44 is more likely to come into contact with the inner surface of the wall portion of the housing 44. Therefore, the condensed water is more likely to adhere to the inner surface of the wall portion, and the condensed water is efficiently separated from the intake air. It will be advantageous.

Further, in the present embodiment, since the intake outlet portion 40 of the intercooler 34 and the body 54 around the intake outlet portion 40 are accommodated in the housing 44, the intake air flowing through the housing 44 is sucked in. Then, it is cooled through the body 54 that is housed inside the housing 44 and cooled by the refrigerant.
Therefore, it is advantageous in increasing the cooling efficiency of the intake air.

  Further, in the present embodiment, the condensate water discharge path 48 for discharging the condensed water accommodated in the inside of the housing 44 is connected to the housing 44, which is advantageous in quickly discharging the condensed water. Become.

In the present embodiment, the high-pressure throttle 52 is arranged on the downstream side of the housing 44 in the direction of intake air flow. However, the high-pressure throttle 52 may be arranged on the intake pipe 1402 on the upstream side of the intercooler 34. Good.
However, according to the present embodiment, since the intake air after the condensed water is separated passes through the high pressure throttle 52, the valve body 56 and the support shaft of the valve body 56 are not easily rusted, and the durability of the high pressure throttle 52 is increased. This is advantageous in improving the quality. In addition, an inexpensive material that is not so high in rust resistance can be used as the material constituting the valve body 56 and the support shaft of the valve body 56, which is advantageous in reducing the cost.

Further, in this embodiment, since the internal space of the housing 44 is connected to the upstream side of the intake manifold 24, the housing 44 is provided with a surge tank that equalizes the amount of intake air supplied to a plurality of cylinders. It can be used as both.
Therefore, it is advantageous in reducing the space of the intake passage portion as compared with the case where a surge tank is separately provided in the intake manifold 24.

(Second Embodiment)
Next, a second embodiment will be described.
FIG. 3 is an explanatory view of the intake structure of the engine according to the second embodiment.
In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, the direction of the body 36 and the volume of the body 36 accommodated in the housing 44 are different from those in the first embodiment.
In other words, in the second embodiment, all portions of the remaining body 36 except for the intake inlet portion 38 of the intercooler 34 and the surrounding body 36 are accommodated in the housing 44.
The intake air inlet portion 38 of the intercooler 34 is directed in the lateral direction orthogonal to the vertical direction, the plurality of intake air cooling passages 42A are directed in the lateral direction, and the intake air outlet portion 40 of the intercooler 34 is disposed inside the housing 44. It is oriented in the lateral direction.
The intake inlet 58 of the high-pressure throttle 52 is disposed toward the body 36 away from the intake outlet 40 of the intercooler 34 inside the housing 44.

Also in the second embodiment, the housing 44 functions as a condensed water separator that separates condensed water from the intake air discharged from the intercooler 34, as in the first embodiment.
The housing 44 can accommodate the intake outlet portion 40 of the intercooler 34 and the intake inlet portion 58 of the high-pressure throttle 52 and can have a small size along the surface of the body 36.
Therefore, the space occupied by the housing 44 is small compared with the case where the condensate separator is provided alone, which is advantageous in reducing the space in the intake passage while separating and discharging the condensate.
In this embodiment, since most of the body 36 is accommodated in the housing 44, the intake air flowing through the housing 44 is accommodated in the housing 44 and cooled by the refrigerant. Cooling is more efficient through the majority of the lower temperature body 36.
Therefore, it is advantageous in increasing the cooling efficiency of the intake air.
Further, since the intake inlet portion 58 of the high-pressure throttle 52 is directed to the body 36, it is more advantageous to introduce the cooled intake air to the high-pressure throttle 52 through the cooled portion of the body 36. .

(Third embodiment)
Next, a third embodiment will be described.
FIG. 4 is an explanatory view of the intake structure of the engine according to the third embodiment.
The third embodiment is a modification of the second embodiment.
In the third embodiment, the orientation of the intake inlet portion 38 of the intercooler 34, the plurality of intake cooling passages 42A, and the intake outlet portion 40 of the intercooler 34 is the same as in the second embodiment, and The volume of the body 36 accommodated is different from that of the second embodiment.
That is, in the third embodiment, the intake outlet portion 40 of the intercooler 34 and the location of the body 36 around the intake outlet portion 40 are accommodated in the housing 44.
The intake inlet 58 of the high-pressure throttle 52 is located above the intake outlet 40 of the intercooler 34.
According to the third embodiment, the same effect as that of the second embodiment can be obtained.

  In the embodiment, the case where the intercooler 34 is provided in the vicinity of the upstream end of the intake manifold 24 has been described. However, the intercooler 34 may be provided in the intake passage 14 away from the intake manifold 24. Well, the position of the intercooler 34 is arbitrary.

DESCRIPTION OF SYMBOLS 10 Engine 14 Intake passage 34 Intercooler 36 Body 38 Intake inlet part 40 Intake outlet part 44 Case 48 Condensate discharge path 58 Intake inlet part

Claims (3)

An intake structure for an engine with an intercooler provided in the intake passage,
A housing is provided that houses an intake outlet portion of the intercooler from which intake air cooled by the intercooler is discharged,
An intake inlet portion of the intake passage disposed downstream of the intercooler is disposed in an upper portion of the housing ,
The intake outlet is provided so that the intake air cooled by the intercooler is discharged upward,
The intake outlet portion is provided in a location having a height equal to or higher than the height of the intake inlet portion in the housing.
Engine intake structure characterized by that. The intercooler may include a coolant channel for cooling the intake air the juxtaposed to said intake air cooling passage and an intake cooling passage connected to the intake passage upstream of the intercooler through the intake air cooling passage in the coolant is provided inside , Having a body provided with the intake outlet which is the downstream end of the intake cooling path,
The location of the body around the intake outlet portion is disposed inside the housing together with the intake outlet portion.
The intake structure for an engine according to claim 1. The casing is provided with a condensed water discharge path for discharging condensed water contained in the casing.
Intake structure according to claim 1 or 2, wherein the engine, characterized in that.

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