JP4357233B2 - Internal combustion engine surge tank - Google Patents

Description

  The present invention relates to a surge tank connected to an intake passage of an internal combustion engine.

  In-vehicle internal combustion engines are equipped with various actuators that utilize the pressure in the intake passage, that is, the intake pressure, such as a brake booster. This intake pressure is mainly extracted from a pressure extraction portion of a surge tank provided in the intake passage.

  Here, if the pressure in the surge tank fluctuates due to the intake pulsation, the pressure taken out from the pressure take-out portion also fluctuates, which may adversely affect the operation of the actuator.

  Therefore, in the surge tank described in Patent Document 1, a part of the wall surface of the surge tank bulges outward, and a pressure takeout part is provided in the bulge part, whereby a pressure takeout part caused by intake pulsation in the surge tank. The pressure fluctuation is suppressed.

In addition, as a prior art document concerning this invention, the patent document 2 shown below other than the said patent document 1 is mentioned.
Japanese Patent Laid-Open No. 8-135531 Japanese Patent Laid-Open No. 11-141419

  By the way, the surge tank described in the above-mentioned Patent Document 1 only forms a bulging volume part on the wall surface thereof, so that the pressure wave of the intake pulsation may still reach the bulging part. For this reason, it is not possible to sufficiently suppress the pressure fluctuation of the pressure extracting portion due to the intake pulsation, and there is a possibility that a stable intake pressure cannot be extracted.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a surge tank of an internal combustion engine that can stably take out intake pressure of the internal combustion engine.

In the following, means for achieving the above object and its effects are described.
According to a first aspect of the present invention, in the surge tank in which the main body is provided with a pressure extraction section for extracting the intake pressure of the internal combustion engine, the pressure extraction section is formed in the main body and is separated from the interior of the main body. , Connected to a partition chamber communicated via a communication passage having a small passage cross-sectional area so as to function as a throttle, and the partition chamber is partitioned by a partition wall having a slit-like gap serving as the communication passage. The gist of the present invention is that the opening on the compartment side of the communication passage is inclined so as to be positioned on the upstream side of the intake with respect to the opening on the side opposite to the compartment side .

  According to this configuration, the pressure in the surge tank, that is, the intake pressure is taken out from the pressure take-out section through the compartment. Here, since the compartment is communicated with the inside of the surge tank, the pressure wave of the intake pulsation in the surge tank is attenuated when passing through the passage communicating the compartment and the inside of the main body, that is, the throttle portion. The pressure wave that has passed through this passage is further attenuated by the volume in the compartment. Therefore, according to the above configuration, it is possible to suppress the pressure fluctuation of the pressure extraction portion caused by the intake pulsation in the surge tank, so that the intake pressure can be stably extracted.

  Note that, in the surge tank described in Patent Document 1, since a member that separates the internal space of the bulging portion and the inside of the surge tank is not provided, the intake air that has flowed into the surge tank reaches the pressure extraction portion, There is a risk of pressure fluctuation due to the dynamic pressure due to the flow. In this regard, in the above-described configuration, since the pressure extraction portion is communicated with the inside of the main body via the compartment, the intake air hardly reaches the pressure extraction portion directly. Accordingly, it is possible to suppress the pressure fluctuation of the pressure take-out portion due to the dynamic pressure of the intake air, and this makes it possible to take out the intake pressure stably.

  Further, in the surge tank described in Patent Document 1, since the intake air easily reaches the pressure extraction portion provided in the bulging portion, moisture or the like in the intake air adheres to the pressure extraction portion and is easily frozen as it is. Become. In this case, it may be difficult to take out the intake pressure due to the pressure take-out portion being blocked. In this regard, according to the above configuration, the intake air is unlikely to reach the compartment provided with the pressure extraction portion, so that moisture or the like hardly adheres to the pressure extraction portion. Therefore, the occurrence of the problem that it is difficult to take out the intake pressure as described above is suppressed, and the intake pressure can be taken out stably.

  Here, when the intake pressure is introduced to the actuator connected to the pressure take-out section, the air in the surge tank flows out through the pressure take-out section, so that the intake air in the surge tank is disturbed and distributed. There are concerns about adverse effects on sex and the like. Therefore, for example, if the passage cross-sectional area of the passage connecting the inside of the main body and the compartment is set sufficiently small to function as a throttle, the air in the surge tank rapidly flows out. Therefore, it is possible to suppress the disturbance of the air-fuel ratio in the combustion chamber.

Incidentally, the formation of the compartment, said compartment by communicating path to become slit-shaped partition wall having a gap has to adopt a configuration such, are partitioned and formed, thereby an increase in the size of the surge tank The compartment can be provided without inviting.
In the same configuration, the opening on the compartment side of the communication passage is inclined so as to be positioned on the intake upstream side of the opening opposite to the compartment side. Accordingly, the communication path is formed in the direction of the intake air downstream side as viewed from the compartment side. Therefore, the intake air flowing along the partition wall is less likely to be diverted toward the communication path. Therefore, it is possible to suppress the occurrence of a problem that a part of the intake air enters the compartment through the communication path and the pressure fluctuation occurs due to the dynamic pressure due to the flow of the intake air. Further, since the air in the compartment is sucked into the surge tank, the pressure in the compartment can be further reduced. For this reason, when an actuator using negative pressure is connected to the pressure take-out portion, the actuator can be operated more suitably.

According to a second aspect of the present invention, in the surge tank of the internal combustion engine according to the first aspect , the partition wall is an inclined surface that inclines toward the inside of the main body from an intake air introduction passage for introducing the intake air into the main body. It is made up of that.

  When the partition is provided in the main body of the surge tank, if the formation mode is not suitable, turbulent flow is generated in the intake air, and part of it enters the compartment through the communication path, and this turbulent flow The dynamic pressure may cause pressure fluctuations in the pressure extraction portion. In this regard, in the above-described configuration, the partition wall is configured by an inclined surface that inclines toward the inside of the main body from the intake air introduction passage for introducing the intake air into the main body. Accordingly, the partition chamber can be formed in a space generated by inclining the partition wall, and the intake air in the surge tank can be smoothly flowed, thereby suppressing the occurrence of the turbulent flow. Accordingly, it is possible to suppress the pressure fluctuation of the pressure take-out portion due to the turbulent flow of the intake air.

According to a third aspect of the present invention, in the surge tank of the internal combustion engine according to the first or second aspect , a portion of the partition downstream of the intake downstream side of the opening on the side opposite to the compartment side of the communication path is upstream. The gist of the invention is to form a step having a step that is more distant from the flow of intake air than the portion.

  If a communication path as described above is provided on the wall surface serving as a flow path for intake air, the intake air collides with the wall surface on the downstream side of the intake air at the opening of this communication path, and part of the air enters the compartment. Sometimes. In this case, there is a possibility that the pressure in the pressure extracting portion may fluctuate due to the flow of the intake air flowing into the compartment. In this respect, according to the above configuration, it is possible to suppress the intake air from colliding with the intake downstream side wall surface of the opening, and thus it is possible to suppress the pressure fluctuation of the pressure extracting portion. In addition, since the turbulent flow of the intake air that is likely to be generated due to the formation of the opening can be suppressed, the rectification effect allows the intake air to smoothly flow into the independent intake passage connected to the downstream side of the surge tank, for example. To be done. In addition, when the said communicating path is formed in slit shape, each said effect becomes still more remarkable.

According to a fourth aspect of the present invention, in the surge tank of the internal combustion engine according to any one of the first to third aspects, the main body is composed of divided bodies that divide the partition walls, and the partition walls are assembled by assembling the divided bodies. The gist is that a gap is formed.

In this configuration, the gap functions as the communication path, and the communication path is simultaneously formed by assembling a main body formed of a divided body. Therefore, the communication path can be easily provided. In addition, about the end surface of each partition which forms a clearance gap, the structure of Claim 3 is easily implement | achieved by shifting the end surface of an intake upstream in the main body of a surge tank compared with the end surface of an intake downstream. You can also.

According to a fifth aspect of the present invention, in the surge tank of the internal combustion engine according to any one of the first to fourth aspects, the pressure extracting portion is located in the compartment with respect to the opening of the communication passage on the compartment side. The gist is to be provided on the opposite side across the space.

  According to this configuration, a sufficient distance from the opening of the communication path to the pressure extraction portion can be ensured. For this reason, it is possible to suppress the pressure fluctuation of the pressure extracting portion caused by the intake pulsation near the opening of the communication passage, the turbulent flow of the intake air, or the like. In addition, since the intake air having a flow does not easily reach the pressure extraction unit, it is possible to further suppress the occurrence of problems due to freezing of moisture or the like in the pressure extraction unit as described above.

The gist of the invention described in claim 6 is the surge tank of the internal combustion engine according to any one of claims 1 to 5 , wherein the pressure take-out portion is constituted by a passage extending in a vertical direction.

  According to this configuration, it is possible to suppress the adhesion of moisture or the like to the pressure take-out part. For this reason, it is possible to further suppress the occurrence of problems due to freezing of moisture or the like in the pressure take-out portion as described above.

The gist of the seventh aspect of the invention is the surge tank of the internal combustion engine according to any one of the first to sixth aspects, wherein the pressure extracting portion is connected to a pressure chamber of a brake booster.

According to this configuration, it is possible to stably secure the auxiliary force for the brake operation obtained by the operation of the brake booster.
The gist of the invention described in claim 8 is that, in the surge tank of the internal combustion engine according to any one of claims 1 to 7 , the main body and the pressure extracting portion are integrally formed of resin.

  According to this configuration, it is possible to reduce the weight of the main body and the pressure extracting portion, and it is possible to simplify the assembly process of the pressure extracting portion.

Hereinafter, an embodiment of a surge tank of an internal combustion engine according to the present invention will be described in detail.
The present embodiment relates to a surge tank integrated intake manifold (hereinafter referred to as “intake manifold”) in which an independent intake passage and a surge tank, which are individually connected to a plurality of cylinders of an internal combustion engine, are integrally formed by a plurality of divided bodies. The surge tank of the internal combustion engine according to the present invention is applied. In addition, as an intake manifold of this embodiment, what is applied to an inline 4-cylinder internal combustion engine is assumed.

The structure of this intake manifold will be described with reference to FIGS.
FIG. 1 shows a front structure of the intake manifold, and FIG. 2 shows a side structure of the intake manifold.

  As shown in FIG. 1, the intake manifold 1 is provided with the independent intake passages 23 arranged in a line, and in the direction of arrangement of the independent intake passages 23, a throttle valve 51 or the like is provided at the center. An intake inlet 22a to which the intake passage 50 provided is connected is provided. A pressure take-out port 25 for taking out the pressure in the intake manifold 1, that is, the intake pressure of the internal combustion engine, is also provided on the side surface of the intake manifold 1. The pressure take-out port 25 is connected to a pressure chamber 60a of a brake booster 60 that assists brake operation force using intake air pressure. Further, as shown in FIG. 2, each independent intake passage 23 is extended so as to go around the intake manifold 1, and at the tip thereof, the independent intake passage 23 is connected to the intake port of the internal combustion engine. A flange 23b is provided.

FIG. 3 shows a cross-sectional structure along the line AA in FIG.
As shown in FIG. 3, a surge tank 24 having a predetermined volume is defined in the intake manifold 1. A branch port 23a of the independent intake passage 23 is provided on the wall surface of the surge tank 24. The intake air flowing into the surge tank 24 through the intake introduction port 22a and the intake introduction passage 22b is supplied to the branch port 23a. It is distributed and supplied to each independent intake passage 23 via 23a.

  On the other hand, a compartment 27 partitioned by a partition wall 28 is formed in the intake manifold 1. The partition wall 28 is formed of an inclined surface that inclines toward the inside of the surge tank 24 from the intake air introduction passage 22 b for introducing intake air into the intake manifold 1, specifically, the surge tank 24. In other words, the partition wall 28 is separated from the side wall 29 of the intake manifold 1 on the side where the pressure extraction port 25 is provided in the direction of the intake air flowing into the surge tank 24 and toward the downstream side.

  In addition, the partition wall 28 is provided with a communication passage 26 that is a slit-like gap that allows the inside of the surge tank 24 and the compartment 27 to communicate with each other. The compartment-side opening 26a that opens to the compartment 27 side in the communication passage 26 is upstream of the intake side of the opening opposite to the compartment 27, that is, the surge tank-side opening 26b that opens to the surge tank 24. Inclined so as to be located on the side.

  In addition, the partition wall 28 has a shape in which a portion on the downstream side of the intake air from the surge tank side opening 26b has a step which is separated from the flow of the intake air than the upstream side portion. In other words, the surge tank side opening 26b is provided with a positive step which does not become a resistance against the flow of intake air, and the peripheral edge on the intake downstream side of the surge tank side opening 26b is made one step lower than the peripheral edge on the intake upstream side. ing.

  On the other hand, the pressure take-out port 25 is provided on the side facing the compartment-side opening 26a across the space in the compartment 27, and has a passage 25a extending in the vertical direction. The passage 25 a communicates with the compartment 27. Further, the end 25b of the pressure take-out port 25 on the side connected to the brake booster 60 is provided below the intake inlet 22a, thereby suppressing the intake manifold 1 from being enlarged in the height direction. Is done.

  As shown in FIG. 3, the intake manifold 1 is divided into three pieces 31 to 33. Each of these pieces 31 to 33 is made of a synthetic resin formed by injection molding or the like. Of the three pieces 31 to 33, the first piece 31 is provided with an intake inlet 22 a, an intake introduction passage 22 b, a part of a downstream passage of the independent intake passage 23, and the like. The second piece 32 is provided with a surge tank 24, an upstream partition wall 28 a constituting the partition wall 28, a compartment 27, a pressure extraction port 25, and the remaining portion of the downstream passage of the independent intake passage 23. The third piece 33 is formed with the branch port 23a, the upstream passage of the independent intake passage 23, the bottom wall of the surge tank 24, the bottom wall of the compartment 27, the downstream partition wall 28b constituting the partition wall 28, and the like. . In addition, a gap is provided at the abutting portion between the upstream partition wall 28a and the downstream partition wall 28b, and the communication path 26 is formed by this clearance. The end face on the surge tank 24 side of the upstream partition wall 28a in this gap is shifted toward the inside of the surge tank 24 as compared with the end face of the downstream partition wall 28b.

  As described above, the surge tank 24 according to the present embodiment has the compartment chamber 27 connected to the inside of the surge tank 24 via the communication passage 26, and the pressure extraction port 25 communicates with the compartment chamber 27. Therefore, the pressure in the surge tank 24, that is, the intake pressure is taken out from the pressure take-out port 25 through the compartment 27. Here, since the compartment 27 is connected to the inside of the surge tank 24 through the communication passage 26, the pressure wave of the intake pulsation in the surge tank 24 passes through the communication passage 26, that is, the throttle portion. Attenuated. Further, the pressure wave that has passed through the communication passage 26 is further attenuated by the volume portion in the compartment 27. Therefore, it becomes possible to suppress the pressure fluctuation in the pressure extraction port 25 caused by the intake air pulsation in the surge tank 24, so that the intake pressure can be stably extracted.

  Further, in the surge tank described in Patent Document 1, since a member that separates the internal space of the bulging portion and the inside of the surge tank is not provided, the intake air that has flowed into the surge tank reaches the pressure extracting portion, There is a risk of pressure fluctuation due to the dynamic pressure due to the flow. In this respect, in the intake manifold 1, since the pressure take-out port 25 communicates with the inside of the surge tank 24 through the compartment 27 and the communication passage 26, the intake air hardly reaches the pressure take-out port 25 directly. Therefore, the pressure fluctuation of the pressure take-out port 25 caused by the dynamic pressure of the intake air can be suppressed, and the intake pressure can be taken out stably by this.

  Further, in the surge tank described in Patent Document 1, since the intake air easily reaches the pressure extraction portion provided in the bulging portion, moisture in the intake air adheres to the pressure extraction portion and freezes as it is. It becomes easy. In this case, there is a possibility that it is difficult to take out the intake pressure because the pressure take-out portion is closed. In this respect, according to the present embodiment, the intake air does not easily reach the compartment 27 where the pressure extraction port 25 is provided as described above, so that moisture or the like is difficult to adhere to the pressure extraction port 25. Therefore, the occurrence of problems such as the difficulty of taking out the intake pressure as described above is suppressed, and the intake pressure can be taken out stably.

  Incidentally, when the intake pressure is introduced into the pressure chamber 60a of the brake booster 60, the air in the surge tank flows out through the pressure take-out portion, so that the intake air in the surge tank is disturbed. As a result, the amount of air supplied to each independent intake passage varies, and as a result, the air-fuel ratio in the combustion chamber of the internal combustion engine may be disturbed. In this respect, in the present embodiment, the air in the surge tank 24 flows out through the communication passage 26 serving as a throttle portion. For this reason, it is possible to suppress a situation in which the air in the surge tank 24 rapidly flows out, and thus to suppress disturbance of the air-fuel ratio in the combustion chamber.

  The partition chamber 27 is defined by a partition wall 28 that is provided inside the intake manifold 1 and has a gap that serves as a communication passage 26 that communicates the interior with the partition chamber 27. The compartment 27 can be provided without increasing the size of the manifold 1.

  On the other hand, when the partition wall is provided in the surge tank 24, if the formation mode is not suitable, turbulent flow is generated in the intake air, and a part thereof enters the compartment 27 via the communication path 26. The dynamic pressure of the turbulent flow may cause a pressure fluctuation in the pressure extraction port 25. In this regard, in the above-described configuration, the partition wall 28 is configured by an inclined surface that inclines inward from the intake tank 22 b through which intake air is introduced into the surge tank 24. Therefore, the partition chamber 27 can be formed in the space generated by inclining the partition wall 28, and the intake air in the surge tank 24 can be smoothly flowed, thereby suppressing the occurrence of the turbulent flow. . Therefore, the pressure fluctuation of the pressure take-out port 25 due to the turbulent flow of the intake air can be suppressed.

  Further, in the communication passage 26 provided in the partition wall 28, the partition chamber side opening 26a is provided on the intake upstream side of the surge tank side opening 26b. That is, the communication path 26 is formed in the direction of the intake downstream side when viewed from the compartment 27 side. Therefore, the intake air flowing along the partition wall 28 is less likely to be diverted toward the communication path 26. Therefore, it is possible to suppress the occurrence of a problem that a part of the intake air enters the compartment 27 through the communication passage 26 and the pressure fluctuation occurs in the pressure extraction port 25 due to the dynamic pressure due to the flow of the intake air. Is done. Further, since the air in the compartment 27 is sucked toward the surge tank 24, the pressure in the compartment 27 can be further reduced. Therefore, the brake booster 60 connected to the pressure extraction port 25 can be operated more suitably.

  Further, when the communication path 26 as described above is provided on the wall surface serving as the flow path of the intake air, the intake air collides with the wall surface on the downstream side of the intake air at the opening of the communication path 26, and a part thereof is the compartment 27. May invade. In this case, the pressure of the pressure extraction port 25 may fluctuate due to the flow of intake air flowing into the compartment 27. In this regard, in this embodiment, the partition wall 28 has a shape in which a portion on the downstream side of the intake air from the surge tank side opening 26b has a step that is separated from the flow of the intake air than the upstream portion. Therefore, it is possible to suppress the intake air from colliding with the intake downstream side wall surface of the surge tank side opening 26b, thereby suppressing the pressure fluctuation of the pressure extraction port 25. Further, since the turbulent flow of intake air that is likely to be generated due to the formation of the surge tank side opening 26b can be suppressed, the intake air to the independent intake passage 23 connected to the downstream side of the surge tank 24 by this rectification effect. Inflow is also carried out smoothly. Accordingly, it is possible to suppress a decrease in engine output due to the formation of the surge tank side opening 26b. In particular, in the present embodiment, since the communication path 26 is formed in a slit shape, the above-described effects become even more remarkable.

  The surge tank integrated intake manifold 1 is composed of divided bodies (the second piece 32 and the third piece 33) that divide the partition wall 28 into the upstream partition wall 28a and the downstream partition wall 28b, and these divided bodies are assembled. Thus, a gap is formed in the partition wall 28. Therefore, this gap functions as the communication path 26, and the communication path 26 is simultaneously formed by assembling the intake manifold 1 formed of a divided body. Therefore, the communication path 26 can be easily provided. For each end face of the upstream partition wall 28a and the downstream partition wall 28b forming the gap, the end face of the upstream partition wall 28a is shifted to the surge tank 24 side compared to the end face of the downstream partition wall 28b. Therefore, the shape on the upstream side of intake in the surge tank side opening 26b as described above can be easily realized.

  Further, the pressure take-out port 25 is provided on the opposite side across the space in the compartment 27 with respect to the compartment-side opening 26a. Therefore, a sufficient distance from the surge tank side opening 26b to the pressure extraction port 25 can be secured. Therefore, it is possible to suppress the pressure fluctuation of the pressure extraction port 25 caused by the intake pulsation and the turbulent flow of the intake air in the communication passage 26 and in the vicinity of the surge tank side opening 26b. In addition, since the intake air having a flow is less likely to reach the pressure extraction port 25, it is possible to further suppress the occurrence of problems due to freezing of moisture or the like in the pressure extraction port 25 as described above.

  The pressure take-out port 25 is constituted by a passage extending in the vertical direction. For this reason, moisture or the like attached to the pressure extraction port 25 falls in the vertical direction, and adhesion of moisture or the like to the pressure extraction port 25 can be suppressed. Therefore, it is possible to further suppress the occurrence of problems due to freezing of moisture or the like in the pressure take-out port 25 as described above.

  As described above, in this embodiment, the intake pressure can be stably extracted from the pressure extraction port 25. The pressure chamber 60a of the brake booster 60 is connected to such a pressure take-out port 25. Therefore, it is possible to stably secure the auxiliary force for the brake operation obtained by the operation of the brake booster 60.

  In addition, since the intake manifold 1 and the pressure extraction port 25 are integrally formed of synthetic resin, the intake manifold 1 and the pressure extraction port 25 can be reduced in weight, and the assembly process of the pressure extraction port 25 is simplified. Will be able to.

As described above, according to the surge tank according to the present embodiment, the following effects can be obtained.
(1) It has a compartment 27 connected to the inside of the surge tank 24 through the communication passage 26, and the pressure take-out port 25 communicates with the compartment 27. Therefore, it is possible to suppress the pressure fluctuation of the pressure take-out port 25 caused by the pressure wave of the intake pulsation in the surge tank 24 and the dynamic pressure of the intake air in the surge tank 24, and the intake pressure from the surge tank 24 can be suppressed. Can be taken out stably. In addition, since moisture or the like hardly adheres to the pressure extraction port 25, the blockage of the pressure extraction port 25 due to freezing of the moisture or the like can be suppressed. And the disturbance of the air fuel ratio in a combustion chamber at the time of the action | operation of the brake booster 60 can also be suppressed.

  (2) The partition chamber 27 is defined by a partition wall 28 provided inside the intake manifold 1 and having a gap serving as a communication passage 26 that communicates the inside with the partition chamber 27. Therefore, the compartment 27 can be provided without increasing the size of the surge tank 24.

  (3) The partition wall 28 is configured by an inclined surface that inclines toward the inside of the surge tank 24 from the intake air introduction passage 22 b for introducing the intake air into the surge tank 24. Therefore, the compartment 27 can be efficiently formed, and the pressure fluctuation of the pressure extraction port 25 due to the turbulent flow of the intake air can be suppressed.

  (4) In the communication passage 26 provided with the partition wall 28, the compartment side opening 26a is provided on the intake upstream side of the surge tank side opening 26b. Therefore, it is possible to suppress the occurrence of a problem that a part of the intake air enters the compartment 27 and the pressure fluctuation occurs in the pressure extraction port 25 due to the dynamic pressure due to the flow of the intake air. Moreover, since the pressure in the compartment 27 can be further reduced, the brake booster 60 can be more suitably operated.

  (5) The partition wall 28 has a shape in which a portion on the downstream side of the intake side from the surge tank side opening 26b has a step which is separated from the flow of intake air more than the upstream side portion. Can be suppressed. Moreover, since the turbulent flow of the intake air that is likely to occur due to the formation of the surge tank side opening 26b can be suppressed, a decrease in engine output can also be suppressed. In addition, in the said embodiment, since the communicating path 26 is formed in slit shape, these each effect is acquired more notably.

  (6) The intake manifold 1 is composed of divided bodies that divide the partition wall 28, and a gap is formed in the partition wall 28 by assembling these divided bodies. Therefore, the communication path 26 can be easily provided. For each end surface of the upstream partition wall 28a and the downstream partition wall 28b forming the gap, the surge tank side end surface of the upstream partition wall 28a is shifted inward of the surge tank 24 compared to the end surface of the downstream partition wall 28b. Therefore, the shape on the upstream side of the intake in the surge tank side opening 26b as described above can be easily realized.

  (7) The pressure take-out port 25 is provided on the opposite side across the space in the compartment 27 with respect to the compartment-side opening 26a. Therefore, it is possible to suppress the pressure fluctuation of the pressure extraction port 25 caused by the intake pulsation, the turbulent flow of the intake air, and the like in the communication passage 26 and in the vicinity of the surge tank side opening 26b. In addition, since the intake air having a flow is less likely to reach the pressure extraction port 25, the occurrence of the above-described problem due to freezing of moisture or the like in the pressure extraction port 25 as described above can be further suppressed.

  (8) The pressure take-out port 25 is constituted by a passage extending in the vertical direction. Therefore, it is possible to further suppress the occurrence of the above-described problem due to freezing of moisture or the like in the pressure extraction port 25.

  (9) Since the pressure take-out port 25 configured as described above is connected to the pressure chamber 60a of the brake booster 60, it is possible to stably secure the auxiliary force for the brake operation obtained by the operation of the brake booster 60. It becomes like this.

In addition, the said embodiment can also be changed and implemented as follows.
-You may form the said communicating path 26 in shapes other than slit shape. Further, the communication path 26 may be provided directly in the partition wall 28 instead of using the communication path 26 as a gap formed between the upstream partition wall 28a and the downstream partition wall 28b.

  -Although the said partition 28 was comprised by the inclined surface, another aspect can also be employ | adopted. Further, the positional relationship between the compartment side opening 26a and the surge tank side opening 26b in the flow direction of the intake air and the shape of the surge tank side opening 26b can be appropriately changed.

The arrangement position of the pressure take-out port 25 and the direction in which the passage 25a of the pressure take-out port 25 is formed can be changed as appropriate.
In the above embodiment, the surge tank integrated intake manifold is divided into three parts, but the number of divisions can be changed as appropriate. Moreover, you may change a division | segmentation location suitably.

In the above embodiment, the brake booster 60 is connected to the pressure take-out port 25, but other actuators that use intake pressure can also be connected.
In the above embodiment, the intake manifold 1 is made of synthetic resin, but may be made of other materials.

  In the above embodiment, the surge tank of the internal combustion engine according to the present invention is applied to a surge tank integrated intake manifold that distributes and supplies intake air to each cylinder of the in-line four-cylinder internal combustion engine. Absent. In short, the surge tank of the internal combustion engine according to the present invention can be applied to any surge tank connected to the intake passage of the internal combustion engine.

The front view which shows the structure about one Embodiment of the surge tank integrated intake manifold to which the surge tank of the internal combustion engine concerning this invention is applied. The side view which shows the structure about the surge tank integrated intake manifold in the embodiment. FIG. 2 is a cross-sectional structure diagram taken along a line AA in FIG. 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Intake manifold, 22a ... Intake inlet port, 22b ... Intake inlet passage, 23 ... Independent intake passage, 23a ... Branch inlet, 23b ... Flange, 24 ... Surge tank, 25 ... Pressure extraction port, 25a ... Passage, 25b ... End Part 26, communication passage, 26a, compartment side opening, 26b, surge tank side opening, 27, compartment, 28 ... partition wall, 28a ... upstream partition, 28b ... downstream partition, 29 ... side wall, 31 ... first 32, second piece, 33, third piece, 50, intake passage, 51, throttle valve, 60, brake booster, 60a pressure chamber.

Claims (8)

In the surge tank in which the pressure extraction portion for extracting the intake pressure of the internal combustion engine is provided in the main body,
The pressure take-out portion includes an inner body with is partitioned and formed inside the main body is connected to the compartment where the cross-sectional area to function as a throttle is communicated via the established communication path small ,
The compartment is defined by a partition having a slit-like gap serving as the communication path,
The surge tank for an internal combustion engine, characterized in that the opening on the compartment side of the communication passage is inclined so as to be positioned upstream of the opening on the side opposite to the compartment side . The surge tank of an internal combustion engine according to claim 1, wherein the partition wall is configured by an inclined surface that inclines toward the inside of the main body from an intake air introduction passage for introducing intake air into the main body . 3. The partition wall according to claim 1 or 2 , wherein a portion of the communication passage on the downstream side of the intake passage from the opening on the side opposite to the compartment side has a step that is spaced apart from the upstream portion than the upstream portion. The internal combustion engine surge tank. The surge tank for an internal combustion engine according to any one of claims 1 to 3, wherein the main body is constituted by a divided body that divides the partition wall, and a gap is formed in the partition wall by assembling the divided bodies . The surge tank for an internal combustion engine according to any one of claims 1 to 4, wherein the pressure extraction portion is provided on an opposite side of the communication passage with respect to an opening on the compartment side with respect to a space in the compartment . The surge tank for an internal combustion engine according to any one of claims 1 to 5, wherein the pressure extracting portion is configured by a passage extending in a vertical direction . The surge tank for an internal combustion engine according to any one of claims 1 to 6, wherein the pressure extracting portion is connected to a pressure chamber of a brake booster . The surge tank for an internal combustion engine according to any one of claims 1 to 7, wherein the main body and the pressure extracting portion are integrally formed of resin .

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