JP4350433B2 - Resin intake manifold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake manifold for distributing intake air to each cylinder of an engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a throttle body that communicates with an intake passage and has a communication passage that is separate from the intake passage. For example, Patent Document 1 discloses a technique for guiding negative pressure in an intake passage to a pressure sensor via a communication passage.
[0003]
Here, the prior art for leading the intake passage negative pressure to the pressure sensor via the communication passage formed in the throttle body will be described with reference to FIGS. An intake passage 62 is formed inside the throttle body 60, and a throttle valve 64 is rotatably provided in the intake passage 62. An intake manifold 68 is connected and fixed to an end face 65 on the downstream side of the intake passage in the throttle body 60 via a seal member (not shown) such as a gasket. A flange 67 (FIG. 7) that bulges outward is formed on the outer surface of the throttle body 60 on the downstream side of the intake passage. The end face 65 of the throttle body 60 is formed with an intake pressure communication port 70 that communicates with the intake passage 62, and a bypass passage 72 as a communication passage that continues from the communication port 70.
[0004]
The communication port 70 is formed at a position (a position parallel to the throttle shaft 66) with the least pressure fluctuation in the cross section of the intake passage 62. The bypass passage 72 is a curved groove that bypasses a part around the intake passage 62. In order to provide the bypass passage 72, the throttle body 60 is formed with a flange 67 that bulges outwardly from the outer side wall. The The intake manifold 68 is formed with a flange 73 having a shape that bulges outward and matches the shape of the flange 67 of the throttle body 60.
[0005]
A first communication passage 74 parallel to the axial direction of the intake passage 62 is formed from a position opposite to the communication port 70 in the bypass passage 72 toward the inside of the throttle body 60. The throttle body 60 is further formed with a second communication passage 76 that connects the outside of the throttle body 60 and the position on the back side of the first communication passage 74. A pressure sensor 78 is attached from the outside of the throttle body 60 toward the second communication passage 76 so as to close the second communication passage 76. The negative pressure in the intake passage 62 reaches the pressure sensor 78 via the communication port 70, the bypass passage 72, the first communication passage 74, and the second communication passage 76.
[0006]
As described above, in the prior art, the communication port 70 communicating with the intake passage 62 and the communication passage (the bypass passage 72, the first communication passage 74, and the second communication passage 76) are formed in the throttle body 60. A communication port 70 that communicates with the intake passage 62 and a bypass passage 72 that continues from the communication port 70 are formed in the downstream end face 65 of the throttle body 60, and the first communication passage 74 and the second communication passage are formed inside the throttle body 60. A passage 76 is formed.
[0007]
[Patent Document 1]
Japanese Patent No. 3377305 (page 2-4, Fig. 1-3)
[0008]
[Problems to be solved by the invention]
In order to connect the first communication passage 74 and the second communication passage 76 formed inside the throttle body 60 to the intake passage 62, generally, a communication port 70 that communicates with the intake passage 62 on the end face 65 of the throttle body 60. A bypass passage 72 for preventing intake pulsation and preventing wiping off of combustion gas is formed. This is because the communication port 70 and the bypass passage 72 are formed on the end face 65 of the throttle body 60 to form the communication port 70 and the bypass passage 72 by die cutting, and the processing operations thereof are omitted. As a result, the throttle body 60 only needs to be processed with the first connecting passage 74 and the second connecting passage 76, and the number of processing steps for the throttle body can be reduced.
[0009]
However, by forming the bypass passage 72 in the end face 65 of the throttle body 60, it has been necessary to form a flange 67 that bulges outward on the end face 65 (FIG. 7). Along with this, the flange 73 of the intake manifold 68 was also greatly expanded outward. For this reason, a sealing member having a wide area corresponding to the shape of the flanges 67 and 68 is required at the joint portion between the flange 67 of the throttle body 60 and the flange 73 of the intake manifold 68, which increases the cost of the sealing member. There were drawbacks.
[0010]
The present invention has been made in view of the above points, and an object of the present invention is to provide an intake manifold capable of reducing the size of the flange and reducing the cost of the seal member.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention joins a throttle body having an intake passage formed therein and a first communication passage formed therein, one of which communicates with an end face and the other communicates with a pressure sensor. A first member for joining the throttle body via a seal member and a second member for welding to the first member in an intake manifold that internally forms an intake passage communicating with the intake passage of the throttle body A communication port that communicates with the intake passage formed in the intake manifold and a bypass channel that communicates with the communication port are formed on at least one of the welding surfaces of the first member and the second member. And forming a communication passage in the first member so that one communicates with the bypass passage and the other communicates with the first communication passage of the throttle body. And it is characterized in and. The present invention is characterized in that the communication passage is formed in the first member so as to penetrate the first member in parallel with a central axis of the intake passage of the intake manifold. In the present invention, the communication port communicates with a position where the pressure fluctuation in the intake passage of the intake manifold is the smallest, and the bypass passage has an arcuate groove that bypasses a part of the intake manifold around the intake passage. It is characterized by that.
[0012]
[Action]
In the present invention, the communication port that communicates with the intake passage and the bypass passage that continues from the communication port are formed at the weld location of at least one of the first member and the second member that are constituent members of the intake manifold. By welding the first member and the second member, the communication port and the bypass passage are formed in the intake manifold instead of the conventional throttle body. The first member is formed with a communication passage, one of which communicates with the bypass passage and the other communicates with the passage of the throttle body. As a result, in the present invention, since it is not necessary to form a bypass passage in the throttle body, the flange that has been swelled to the outside which has been conventionally required for the throttle body can be eliminated, and the flange of the intake manifold can also be reduced in size. Moreover, since the direction of the throttle body to be joined can be set by the position of the communication passage that opens to the flange of the intake manifold, it is possible to flexibly cope with the layout around the throttle body. In addition, since the flange bulging outside the throttle body can be eliminated, the sealing area is improved by reducing the joint area between the throttle body and the intake manifold, and the cost of the seal member is reduced by making the seal member smaller than before.
[0013]
First Embodiment of the Invention
Next, the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing an intake manifold according to the present invention, FIG. 2 is a cross-sectional view of a main part of FIG. 1, and FIG. 3 is a cross-sectional view of a throttle body of FIG. An intake passage 12 is formed in the throttle body 10, and a throttle valve 14 is rotatably provided in the intake passage 12. A first communication passage 18 parallel to the central axis of the intake passage 12 is formed in the throttle body 10 from the end surface 16 on the downstream side of the intake passage toward the inside of the throttle body 10. The throttle body 10 is further formed with a second communication passage 20 that communicates the outside of the throttle body 10 with the position on the back side of the first communication passage 18. That is, the passages formed in the throttle body 10 are a total of two passages, the first communication passage 18 and the second communication passage 20 connected to the first communication passage 18. A pressure sensor 22 is attached from the outside of the throttle body 10 toward the second communication passage 20 so as to close the second communication passage 20.
[0014]
An intake manifold 24 is connected and fixed to an end surface 16 on the downstream side of the intake passage in the throttle body 10 via a seal member (not shown) such as a gasket. The intake manifold 24 includes a first member 26 connected to the throttle body 10, a second member 28 welded to the first member 26, and other members (not shown). The first member 26 and the second member 28, which are constituent members of the intake manifold 24, are made of, for example, synthetic resin materials that can be welded to each other and made by molding.
[0015]
As shown in FIG. 2, the first member 26 has an end face 30 for joining the throttle body 10 and an end face 32 for joining the second member 28. The second member 28 has an end face 34 for joining with the first member 26. The joining end surface 32 of the first member 26 and the joining end surface 34 of the second member 28 are joined together, and the joining surfaces are welded to form the intake manifold 24 (the portion on the throttle body 10 side). An intake passage 36 communicating with the intake passage 12 of the throttle body 10 is formed in the intake manifold 24 formed by welding the first member 26 and the second member 28. The intake passage 36 is located on the downstream side of the throttle valve 14.
[0016]
The end face 32 for joining the first member 26 to the second member 28 has an intake pressure communication port 38 (FIG. 1) communicating with the intake passage 36, and an arcuate detour passage 40 continuing from the communication port 38. It is formed. The bypass passage 40 has an arcuate groove shape that bypasses a part around the intake passage 36. A communication passage 42 (FIG. 2) is formed through the entire thickness of the first member 26 in parallel with the central axis of the intake passage 36 from the position where the detour passage 40 is recessed. The communication port 38 is formed at a position where the pressure fluctuation in the intake passage 36 is the smallest.
[0017]
When the first member 26 and the second member 28 are welded to form the intake manifold 24 (the portion on the throttle body 10 side), the bypass passage 40 has the joining end surface 32 of the first member 26 and the second member 28. As a result of the welding with the joining end face 34, a state of being sealed except for the communication port 38 is obtained. As a result of this welding, a passage that connects the bypass passage 40 and the communication passage 42 is formed inside the intake manifold 24, and an opening to the outside on the bypass passage 40 side is a communication port 38 that communicates with the intake passage 36. In addition, the opening to the outside on the side of the communication passage 42 becomes a connection port 44 (FIG. 2) that opens to the joining end surface 30. Since the joining end surface 32 of the first member 26 forming the bypass passage 40 is fixed to the joining end surface 34 of the second member 28 by welding, a sealing member for sealing the bypass passage 40 is not necessary. . When the bypass passage 40 is hermetically formed inside the intake manifold 24, the manufacturing cost does not change compared to the conventional intake manifold.
[0018]
When connecting and fixing the joining end face 30 of the intake manifold 24 (first member 26) and the end face 16 of the throttle body 10, the connection port 46 of the first communication passage 18 formed in the throttle body 10 and the intake manifold 24 are connected. And the connection port 44 of the communication passage 42 formed in the above. At this time, a seal member (not shown) having a hole for connecting the connection port 44 and the connection port 46 is interposed. Accordingly, the pressure sensor 22 causes the intake passage negative pressure of the intake passage 36 of the intake manifold 24 to reach the pressure sensor 22 via the bypass passage 40, the communication passage 42, the first communication passage 18, and the second communication passage 20. become.
[0019]
In the present invention, the communication port 38 and the bypass passage 40 are formed in the first member 26 constituting the intake manifold 24, and the first member 26 and the second member 28 are welded, so that the bypass passage 40 is taken in. It is formed inside the manifold 24. Accordingly, in the present invention, it is not necessary to form a bypass passage in the throttle body 10, and accordingly, the flange bulging outward provided in the conventional throttle body can be eliminated. By removing the flange that bulges outside, the flange of the intake manifold 24 can also be reduced in size. Further, the sealing area can be improved by narrowing the joint area between the throttle body 10 and the intake manifold 24, and the cost of the sealing member can be reduced as compared with a sealing member having a large area.
[0020]
Second Embodiment of the Invention
Next, another embodiment of the present invention will be described. FIG. 4 is an exploded cross-sectional view of the main part of another intake manifold according to the present invention, and FIG. 5 is a bottom view of the second member of the intake manifold used in FIG. In the first embodiment described above, the bypass passage 40 is formed in the joining end surface 32 of the first member 26. In the second embodiment, the joining end surface 34 of the second member 28 with the first member 26 is used. The communication port 48 and the bypass passage 50 are formed. On the other hand, only the communication passage 42 penetrating the thickness is formed in the first member 26. The throttle body 10 has the same shape as the first embodiment. Since the difference between the first embodiment and the second embodiment is only the difference in whether the communication port and the bypass passage are formed in the first member 26 or the second member 28, the second embodiment. Has the same effect as the first embodiment. In addition, you may form a communication port and a detour path in both the joining locations of the 1st member 26 and the 2nd member 28. FIG.
[0021]
In the above-described embodiment, the connection port 44 of the communication passage 42 formed in the intake manifold 24 has been described as communicating with the connection port 46 of the first communication passage 18 of the throttle body 10 communicating with the pressure sensor 22. However, the connection port 44 of the communication passage 42 formed in the intake manifold 24 is not limited to the case where it communicates with the passage (first communication passage 18) leading to the pressure sensor 22. The connection port 44 of the communication passage 42 formed in the intake manifold 24 is, for example, a bypass passage formed in the throttle body 10 (bypassing the intake passage in order to increase the amount of air when the intake passage is at an idle opening degree). You may make it contact a passage).
[0022]
【The invention's effect】
As described above, according to the intake manifold according to the present invention, the communication port that communicates with the intake passage and the bypass passage that communicates with the communication port are formed at the welding location between the first member and the second member of the intake manifold. The first member and the second member are welded to form a bypass passage formed in the conventional throttle body in the intake manifold. As a result, the flange that has been provided outside the throttle body can be eliminated, and the flange of the intake manifold can be made smaller than the conventional one. Moreover, since the direction of the throttle body to be joined can be set by the position of the communication passage that opens to the flange of the intake manifold, it is possible to flexibly cope with the layout around the throttle body. Further, the sealing area can be improved by reducing the joint area between the slot body and the intake manifold, and the cost of the sealing member can be reduced by reducing the area of the sealing member.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an intake manifold according to the present invention.
FIG. 2 is an exploded cross-sectional view of a main part of FIG.
3 is a cross-sectional view of the throttle body of FIG.
FIG. 4 is an exploded cross-sectional view of a main part of another intake manifold according to the present invention.
FIG. 5 is a bottom view of the second member of the intake manifold used in FIG. 5;
FIG. 6 is a side view of a throttle body used in a conventional intake manifold.
7 is a cross-sectional view of a conventional intake manifold using the throttle body of FIG. 6. FIG.
8 is a cross-sectional view of a main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Throttle body 12 Intake passage 14 Throttle valve 16 End surface 18 First connection passage 20 Second connection passage 22 Pressure sensor 24 Intake manifold 26 First member 28 Second member 30 End face 32 for joining 34 End face 36 for joining Intake passage 38 Communication Port 40 Detour Channel 42 Communication Channel 48 Communication Port 50 Detour Channel

Claims (3)

An intake passage is formed inside, and a first communication passage that connects one end to the end face and the other to a pressure sensor is joined to a throttle body formed inside, and communicates with the intake passage of the throttle body. An intake manifold having an intake passage formed therein, the intake manifold having a first member for joining to the throttle body via a seal member and a second member for welding to the first member, A communication port that communicates with the intake passage formed in the intake manifold and a bypass passage that communicates with the communication port are formed on at least one of the welding surfaces with the second member, and one side communicates with the bypass passage and the other A connecting passage for communicating with the first connecting passage of the throttle body is formed in the first member. Hold.   2. The resin intake manifold according to claim 1, wherein the communication passage is formed in the first member so as to penetrate the first member in parallel with a central axis of the intake passage of the intake manifold.   The communication port communicates with a position where the pressure fluctuation in the intake passage of the intake manifold is the smallest, and the bypass passage is an arcuate groove that bypasses a part around the intake passage of the intake manifold. The resin intake manifold according to claim 1 or 2.

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