JP7124573B2 - intake manifold - Google Patents

Description

The present invention relates to intake manifolds for internal combustion engines.

Conventionally, an intake manifold for a vehicle-mounted internal combustion engine has a surge tank having an intake inlet for introducing intake air, and a plurality of branch pipes extending branching from the surge tank and connected to respective intake ports of a cylinder head. there is In addition, the surge tank is provided with an introduction port that introduces blow-by gas in the crankcase and a supply port that supplies negative pressure to negative pressure driven devices such as the brake booster of the vehicle (for example, See Patent Document 1).

JP-A-2002-235620

By the way, in the intake manifold described in Patent Document 1, a negative pressure supply port is provided at a position close to the blow-by gas introduction port. As a result, there is a risk that water droplets generated by condensation of moisture contained in the blow-by gas will flow into the surge tank from the inlet port and into the negative pressure supply port due to the flow of intake air (dynamic pressure) inside the surge tank. There is As a result, such water may freeze in the pipe connected to the supply port, causing problems such as blockage of the pipe.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake manifold capable of suppressing inflow of water droplets from an introduction port to a supply port.

An intake manifold for achieving the above object comprises a surge tank having an intake inlet for introducing intake air, and a plurality of branch pipes extending branching from the surge tank and connected to an intake port of an internal combustion engine. comprising a surge tank main body having a side wall provided with an opening, an introduction port for introducing blow-by gas into the surge tank, and a supply port for supplying the negative pressure in the surge tank to the outside, a port portion that constitutes the surge tank together with the surge tank body portion by being joined to the opening portion of the surge tank body portion, the outlet portion of the introduction port and the inlet portion of the supply port; are opened side by side in the surge tank, and a stepped portion is provided between the outlet portion of the introduction port and the inlet portion of the supply port.

According to this configuration, since the stepped portion is provided between the outlet portion of the introduction port and the inlet portion of the supply port, water droplets flowing into the surge tank from the introduction port flow along the wall surface of the surge tank and flow through the supply port. It becomes difficult to move to the side. Therefore, it is possible to suppress the inflow of water droplets from the introduction port to the supply port.

According to the present invention, it is possible to suppress the inflow of water droplets from the introduction port to the supply port.

1 is a perspective view schematically showing the configuration of an embodiment of an intake manifold; FIG. FIG. 4 is an exploded perspective view showing the surge tank main body and the port part of the same embodiment spaced apart from each other; The perspective view which looked the port part of the same embodiment from the 2nd joint part side. The perspective view which shows the inner surface of the ceiling part in the surge tank of the same embodiment. FIG. 2 is a cross-sectional view taken along line 5-5 of FIG. 1; The perspective view which shows the inner surface of the ceiling part in the surge tank of the 1st modification. The perspective view which shows the inner surface of the ceiling part in the surge tank of the 2nd modification.

An embodiment of the intake manifold will be described below with reference to FIGS. 1 to 5. FIG.
As shown in FIG. 1, the intake manifold of the present embodiment is applied to an in-line four-cylinder in-vehicle internal combustion engine, and is made of a hard resin material having heat resistance.

The intake manifold has a surge tank 10 having an intake inlet 10a for introducing intake air, and a plurality of branch pipes 40 (four in this embodiment) connected to the surge tank 10 .

The surge tank 10 has a rectangular parallelepiped surge tank body 20 and a first flange 26 protruding from the opening edge of the intake inlet 10a of the surge tank body 20 toward the outer periphery. The first flange portion 26 is connected to an intake pipe (not shown). As a result, the intake air flowing through the intake pipe is supplied into the surge tank 10 through the intake inlet 10a. The intake pipe is provided with a throttle valve for adjusting the amount of intake air supplied to the surge tank 10 .

The branch pipe 40 is connected to the bottom portion 21 a of the side wall 21 of the surge tank 10 . Each branch pipe 40 extends downward from the bottom portion 21a of the surge tank main body 20 and bends to extend laterally. A second flange portion 41 is provided at the tip of each branch pipe 40 . The second flange portion 41 is connected to a wall surface of a cylinder head (not shown). The intake manifold is thereby assembled to the cylinder head. A plurality of intake ports are formed in the cylinder head. When the intake manifold is assembled to the cylinder head, each branch pipe 40 communicates with the intake port.

As shown in FIG. 2 , the surge tank main body 20 has an opening 25 formed in the ceiling portion 21 b facing the bottom portion 21 a of the side wall 21 . A port portion 30 formed separately from the surge tank body portion 20 is joined to the opening portion 25 . As described above, the surge tank 10 includes the surge tank body 20 having the side wall 21, the port 30 formed separately from the surge tank body 20, and the first flange 26. .

Hereinafter, the axial direction of the surge tank body 20 will be referred to as the axial direction L, and the direction orthogonal to both the axial direction L and the direction in which the bottom portion 21a and the ceiling portion 21b face each other will be referred to as the orthogonal direction W.

<Surge tank body 20>
As shown in FIG. 2, the opening 25 of the side wall 21 is provided with a first joint portion 25b forming a peripheral edge of the opening 25a. The opening 25 has a substantially rectangular annular shape elongated in the axial direction L. As shown in FIG.

As shown in FIG. 4 , on the inner surface of the ceiling portion 21 b of the side wall 21 , there is a peripheral edge portion 22 that forms the peripheral edge of the opening 25 a of the opening 25 , and the surge tank 10 and an outer peripheral portion 23 located inside the peripheral portion 22 are provided via a step 24 formed over the entire circumference of the peripheral portion 22 .

<Port section 30>
As shown in FIGS. 1 to 3, the port portion 30 is formed by vertically penetrating a substantially rectangular plate-shaped base portion 31 joined to the opening 25 of the surge tank main body 20 and the base portion 31. It has an introduction port 32 and a supply port 33 .

The introduction port 32 and the supply port 33 vertically penetrate the base portion 31 and protrude from the upper surface of the base portion 31, and extend in the orthogonal direction W toward the side opposite to the second flange portion 41 side.

An introduction pipe (not shown) is connected to the leading end of the introduction port 32 for introducing into the surge tank 10 blow-by gas generated with the operation of the internal combustion engine.
A supply pipe (none of which is shown) is connected to the tip of the supply port 33 to supply intake pipe negative pressure (hereinafter referred to as negative pressure) in the surge tank 10 to a negative pressure-driven brake booster. .

As shown in FIGS. 3 to 5, an outlet portion 32a, which is an opening on the opposite side to the tip of the introduction port 32, and an inlet portion 33a, which is an opening on the opposite side to the tip of the supply port 33, are separated from each other. , are opened side by side in the axial direction L in the surge tank 10 . In the introduction port 32, since the blow-by gas flows into the surge tank 10 from the tip, the side of the introduction port 32 that opens into the surge tank 10 will be described as the outlet 32a. Since the negative pressure in the surge tank 10 is supplied to the brake booster through the supply port 33, the side of the supply port 33 that opens into the surge tank 10 will be described as an inlet portion 33a.

A substantially rectangular annular second joint portion 31 a that is joined to the first joint portion 25 b of the opening 25 protrudes from the lower surface of the base portion 31 . The first joint portion 25b and the second joint portion 31a are joined to each other by vibration welding.

A flat surface 31 b of the base portion 31 is interposed between the outlet portion 32 a of the introduction port 32 and the inlet portion 33 a of the supply port 33 .
On the flat surface 31 b of the base portion 31 , an annular first rib 35 is provided along the periphery of the outlet portion 32 a of the introduction port 32 and protrudes toward the inside of the surge tank 10 , and the inlet portion 33 a of the supply port 33 . An annular second rib 36 is formed along the periphery of the surge tank 10 and protrudes toward the inside of the surge tank 10 . A pair of connecting ribs 34 that connect both end portions of the first rib 35 and the second rib 36 in the orthogonal direction W are protruded from the flat surface 31b of the base portion 31 so as to be parallel to each other. A stepped portion 37 is formed by the flat surface 31b of the base portion 31 and the first rib 35 . A step portion 38 is formed by the flat surface 31 b of the base portion 31 and the second rib 36 .

The action and effect of this embodiment will be described.
(1) The outlet 32a of the introduction port 32 and the inlet 33a of the supply port 33 are open side by side in the surge tank 10 . Stepped portions 37 and 38 are provided between the outlet portion 32 a of the introduction port 32 and the inlet portion 33 a of the supply port 33 .

According to this configuration, since the stepped portions 37 and 38 are provided between the outlet portion 32a of the introduction port 32 and the inlet portion 33a of the supply port 33, water droplets flowing into the surge tank 10 from the introduction port 32 are It becomes difficult to move along the wall surface of the surge tank 10 to the supply port 33 side. Therefore, it is possible to suppress the inflow of water droplets from the introduction port 32 to the supply port 33 .

(2) The stepped portions 37 and 38 are composed of a flat surface 31b interposed between the outlet portion 32a and the inlet portion 33a, and a first rib 35 and a second rib protruding toward the inside of the surge tank 10 from the flat surface 31b. 36.

According to such a configuration, the stepped portions 37 and 38 can be easily realized by the flat surface 31 b and the first rib 35 and the second rib 36 .
Further, according to the above configuration, two stepped portions 37 and 38 are formed between the outlet portion 32 a of the introduction port 32 and the inlet portion 33 a of the supply port 33 . Therefore, water droplets that have flowed into the surge tank 10 from the introduction port 32 are less likely to move along the wall surface of the surge tank 10 toward the supply port 33 side. Therefore, the inflow of water droplets from the introduction port 32 to the supply port 33 can be suppressed.

Further, according to the above configuration, the first rib 35 is provided along the periphery of the outlet portion 32a of the introduction port 32, and the second rib 36 is provided along the periphery of the inlet portion 33a of the supply port 33. Therefore, the shapes of the outlet portion 32a and the inlet portion 33a are less likely to be affected by the first ribs 35 and the second ribs . Thereby, it is possible to suppress deterioration of the introduction performance of the introduction port 32 and the supply performance of the supply port 33 .

(3) On the inner surface of the ceiling portion 21b of the side wall 21 of the surge tank 10, the peripheral edge portion 22 of the opening 25a and the peripheral portion located around the peripheral edge portion 22 and positioned inside the surge tank 10 from the peripheral edge portion 22 23 are provided via a step 24 .

According to such a configuration, the intake air flowing along the inner surface of the side wall 21 of the surge tank body 20 is decelerated when moving from the outer peripheral portion 23 to the peripheral edge portion 22 . That is, the intake dynamic pressure near the peripheral portion 22 is lower than the intake dynamic pressure near the outer peripheral portion 23 . As a result, the force (intake dynamic pressure) that moves the water droplets that have flowed into the surge tank 10 from the introduction port 32 toward the supply port 33 is smaller than in a configuration in which the step 24 is not provided. Therefore, the inflow of water droplets from the introduction port 32 to the supply port 33 can be further suppressed.

(4) The step 24 is provided over the entire circumference of the peripheral portion 22 .
According to such a configuration, the dynamic pressure of intake air is reduced over the entire circumference of the peripheral portion 22 . As a result, regardless of the shape of the surge tank 10 and the arrangement of the intake port 10a and the branch pipe 40, the force (the dynamic pressure of the intake air) that moves the water droplets flowing into the surge tank 10 from the introduction port 32 toward the supply port 33 ) can be effectively reduced.

Further, for example, when the surge tank body 20 and the port 30 each made of a resin material are joined by vibration welding, the peripheral edge 22 serves as a pressurizing surface when the surge tank body 20 and the port 30 are pressurized. can be used.

(5) The opening 25 is provided in the ceiling portion 21 b of the side wall 21 of the surge tank main body 20 .
For example, if the introduction port 32 is provided in the ceiling portion of the surge tank where the step 24 is not provided, water droplets flowing into the surge tank from the introduction port 32 flow along the ceiling surface of the surge tank when the internal combustion engine is stopped. There is a risk that the air will flow into the intake air introduction port 10a.

In this respect, according to the above configuration, the water droplets adhering to the peripheral portion 22 of the opening 25a fall inside the step 24 that is the boundary with the peripheral portion 23, and cross the step 24 to reach the peripheral portion 23. becomes difficult to move. Therefore, it is possible to suppress the inflow of water droplets into the intake inlet 10a.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- As shown in FIG. 6 , a rib 135 projecting inwardly of the surge tank 10 from the outer peripheral portion 23 may be provided in a portion of the first rib 35 that constitutes the stepped portion 37 .

According to such a configuration, at the outlet portion 32 a of the introduction port 32 , water droplets travel along the ribs 135 to the tips of the ribs 135 . Since the tip side of the rib 135 is spaced from the inlet portion 33a of the supply port 33, it is possible to suppress the water droplets that have moved along the rib 135 from flowing into the supply port 33 due to the dynamic pressure of the intake air.

- As shown in FIG. 7, a third rib 51 protruding from the peripheral portion 22 toward the inside of the surge tank 10 is provided in a portion between the first rib 35 and the second rib 36 of the peripheral portion 22. You may do so. A lid portion 52 is preferably formed at the proximal end of the third rib 51 to extend toward the distal end of the first rib 35 and close the space between the third rib 51 and the first rib 35 .

According to such a configuration, the third rib 51 can prevent water droplets that have flowed into the surge tank 10 from the introduction port 32 from moving toward the supply port 33 .
Further, according to the above configuration, the space between the third rib 51 and the first rib 35 is blocked by the cover portion 52 extending from the proximal end of the third rib 51 toward the distal end of the first rib 35 . Therefore, it is possible to appropriately suppress movement of water droplets toward the supply port 33 through the gap between the first rib 35 and the third rib 51 .

- An opening 25 may be provided in a portion of the side wall 21 of the surge tank main body 20 that is different from the ceiling portion 21b, and the port portion 30 may be joined thereto.
- The surge tank body portion 20 and the port portion 30 may be joined to each other by a joining method other than vibration welding such as ultrasonic welding.

- The step 24 may not be provided over the entire circumference of the peripheral portion 22 . For example, it may be provided only between the intake inlet 10 a and the outlet 32 a of the introduction port 32 in the axial direction L of the peripheral edge 22 .

- The step 24 can be omitted.
- The first rib 35 and the second rib 36 may protrude toward the inside of the surge tank 10 and may have curved ends.

- By omitting the first rib 35 and the second rib 36 and forming a groove along the orthogonal direction W in the flat surface 31b of the base portion 31, the groove and the flat surface 31b form a stepped portion. good.

- The port section 30 may have a plurality of supply ports. Even in this case, a stepped portion may be provided between the introduction port and each supply port.
- The supply port 33 is not limited to supplying negative pressure to the negative pressure chamber of the brake booster. Alternatively, for example, an EGR gas port for introducing EGR gas into the surge tank 10 may be used.

In this embodiment, an intake manifold applied to an in-line 4-cylinder vehicle internal combustion engine was exemplified. An intake manifold may be applied. Similarly, the present invention can also be applied to V-type internal combustion engines and horizontally opposed internal combustion engines.

DESCRIPTION OF SYMBOLS 10... Surge tank, 10a... Air intake inlet, 20... Surge tank main-body part, 21... Side wall, 21a... Bottom part, 21b... Ceiling part, 22... Periphery part, 23... Periphery part, 24... Step, 25... Opening part , 25a... opening, 25b... first joint part, 26... first flange part, 30... port part, 31... base part, 31a... second joint part, 31b... flat surface, 32... introduction port, 32a... outlet part , 33 supply port 33a inlet portion 34 connecting rib 35 first rib 36 second rib 37 stepped portion 38 stepped portion 40 branch pipe 41 second flange portion 51... 3rd rib, 52... cover part, 135... Rib.

Claims (9)

An intake manifold comprising a surge tank having an intake inlet for introducing intake air, and a plurality of branch pipes branching from the surge tank and extending and connected to an intake port of an internal combustion engine,
a surge tank body having a side wall provided with an opening;
It has an introduction port for introducing blow-by gas into the surge tank and a supply port for supplying the negative pressure in the surge tank to the outside. a port portion that constitutes the surge tank together with the tank main body portion,
The outlet of the introduction port and the inlet of the supply port are opened side by side in the surge tank,
A stepped portion is provided between the outlet portion of the introduction port and the inlet portion of the supply port ,
The stepped portion is formed by a base portion interposed between the outlet portion and the inlet portion, and a rib protruding from the base portion toward the inside of the surge tank,
intake manifold. The ribs include a first rib provided along the periphery of the outlet portion and a second rib provided along the periphery of the inlet portion,
The intake manifold of claim 1 . A third rib is formed between the first rib and the second rib and protrudes toward the inside of the surge tank from the peripheral edge of the opening,
A base end of the third rib is formed with a lid portion that extends toward a tip end of the first rib and closes a space between the third rib and the first rib.
3. The intake manifold of claim 2 . An intake manifold comprising a surge tank having an intake inlet for introducing intake air, and a plurality of branch pipes branching from the surge tank and extending and connected to an intake port of an internal combustion engine,
a surge tank body having a side wall provided with an opening;
It has an introduction port for introducing blow-by gas into the surge tank and a supply port for supplying the negative pressure in the surge tank to the outside. a port portion that constitutes the surge tank together with the tank main body portion,
The outlet of the introduction port and the inlet of the supply port are opened side by side in the surge tank,
A stepped portion is provided between the outlet portion of the introduction port and the inlet portion of the supply port ,
On the inner surface of the side wall, a peripheral edge portion of the opening and an outer peripheral portion located around the peripheral edge portion and positioned inside the surge tank from the peripheral edge portion are provided via a step.
intake manifold. The stepped portion is formed by a base portion interposed between the outlet portion and the inlet portion, and a rib protruding from the base portion toward the inside of the surge tank,
An intake manifold according to claim 4 . The ribs include a first rib provided along the periphery of the outlet portion and a second rib provided along the periphery of the inlet portion,
An intake manifold according to claim 5 . A third rib is formed between the first rib and the second rib and protrudes toward the inside of the surge tank from the peripheral edge of the opening,
A base end of the third rib is formed with a lid portion that extends toward a tip end of the first rib and closes a space between the third rib and the first rib.
7. An intake manifold as claimed in claim 6 . The step is provided over the entire periphery of the peripheral edge of the opening,
The intake manifold according to any one of claims 4 to 7 . The opening is provided in the ceiling portion of the side wall of the surge tank main body,
The intake manifold according to any one of claims 4 to 8 .

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