JP5254880B2 - Engine intake system - Google Patents

Description

  The present invention relates to an intake device for an engine. In particular, the present invention relates to an intake manifold having a plurality of independent intake passages.

  Conventionally, an intake manifold having two intake passages for each cylinder is known. These two intake passages are arranged in parallel, and communicate the surge tank and the cylinder independently of each other. In one of the two intake passages, an adjustment valve that adjusts the flow rate of the intake air is arranged in the middle of the passage to open and close according to the engine speed (see, for example, Patent Document 1). ).

Japanese Utility Model Publication No.59-163128

  In the intake device described in Patent Document 1, all of the plurality of openings of the independent intake passage formed in the surge tank are formed at substantially the same position. For this reason, the water generated in the surge tank is equally likely to enter any independent intake passage. When the water enters the independent intake passage having the adjustment valve, the water adheres to the adjustment valve and is adjusted. There was a risk of the valve being deteriorated or frozen and fixed.

  An object of the present invention is to provide an intake manifold that can prevent water in a surge tank from flowing into an independent intake passage in which a regulating valve is disposed, and prevent the regulating valve from deteriorating. To do.

  (1) A plurality of independent intake passages (for example, first to fourth independent intakes to be described later) that connect a surge tank (for example, a surge tank 25 to be described later), the surge tank and the cylinder, and supply intake air to the cylinder. An intake manifold (e.g., an intake manifold 20 to be described later), wherein the plurality of independent intake passages are first independent intake passages (e.g., communication between the surge tank and the cylinders). A first independent intake passage 21), which will be described later, and a third independent intake passage (for example, a third independent intake passage 23, which will be described later) formed in parallel with the first independent intake passage and communicating the surge tank and the cylinder. In the first independent intake passage, a first intake flow rate adjustment valve (for example, a first intake flow rate adjustment valve 31 described later) is disposed, and the first intake passage is formed in the surge tank. A lowermost portion of a first opening (for example, a first opening 211 described later) that is a communication opening of the standing intake passage is a third opening (for example, a communication opening of the third independent intake passage formed in the surge tank). An intake manifold formed so as to be positioned vertically above a lowermost part of a third opening (231) to be described later.

  According to the invention described in (1), in the intake manifold having a plurality of independent intake passages that connect the surge tank and the cylinder to supply intake air to the cylinders, the first independent intake passage among the plurality of independent intake passages. The lowermost portion of the first opening, which is the communication opening, is positioned vertically above the lowermost portion of the third opening, which is the communication opening of the third independent intake passage formed in parallel with the first independent intake passage. As a result, the condensed water generated in the surge tank and the water that has entered the surge tank are urged to be discharged from the third opening, and the water is supplied to the first intake flow rate adjusting valve disposed in the first independent intake passage. It is possible to suppress the first intake flow rate adjustment valve from being deteriorated by condensed water or from being frozen and fixed by suppressing the arrival.

  (2) The intake manifold according to (1), wherein an upstream side intake passage (for example, an upstream side intake passage 14 described later) is connected upstream of the surge tank, and the bottom surface of the surge tank is connected to the upstream side An intake manifold, wherein the intake manifold is disposed so as to incline vertically upward from an inlet portion to which an intake passage is connected.

According to the invention described in (2), (1) in addition to the invention described in, is connected to the upper stream side intake passage upstream of the surge tank, the bottom of the surge tank, the connection upstream side intake passage It arrange | positions so that it may incline in the perpendicular direction toward the back from the entrance. Thereby, it can suppress that the water which penetrate | invades in a surge tank retains in the back | inner side of a surge tank, and can make it easy to discharge | emit from a 3rd independent intake passage.

  (3) The intake manifold according to (1) or (2), wherein the third independent intake passage is formed so as to monotonously descend from the surge tank side toward the cylinder. Intake manifold.

  According to the invention described in (3), in addition to the invention described in (1) or (2), the third independent intake passage is formed to monotonously descend from the surge tank side toward the cylinder. Thereby, the water led out from the surge tank to the third independent intake passage can reach the cylinder by its own weight and can be prevented from staying in the third independent intake passage.

(4) The intake manifold according to any one of (1) to (3),
An intake manifold, wherein at least a part of the third opening is formed on a bottom surface of the surge tank.

  According to the invention described in (4), in addition to the invention described in any of (1) to (3), at least a part of the third opening is formed on the bottom surface of the surge tank. Thereby, the water that has entered the surge tank can be easily discharged from the surge tank.

  (5) The intake manifold according to any one of (1) to (4), wherein a first cylinder bank (for example, a first cylinder bank 11 described later) and a second cylinder bank (for example, a second cylinder described later) A V-type engine (for example, V-type engine 1 described later), the first independent intake passage, and the third independent intake passage communicate with the first cylinder bank, and the plurality of independent intake passages. The passage is formed in parallel with a second independent intake passage (for example, a second independent intake passage 22 described later) that communicates the surge tank and the cylinders of the second cylinder bank, and the second independent intake passage. A fourth independent intake passage (for example, a fourth independent intake passage 24 described later) that communicates the tank and the cylinders of the second cylinder bank, and the second independent intake passage includes a second independent intake passage. An air flow rate adjusting valve (for example, a second intake flow rate adjusting valve 32 to be described later) is disposed, and the first independent intake passage and the second independent intake passage are formed so as to protrude into the surge tank and are mutually connected. A second opening (for example, a second opening 221 to be described later) that is formed so as to intersect and is a communication opening of the second independent intake passage formed in the surge tank and the third opening face each other. A fourth opening (for example, a fourth opening 241 described later) that is a communication opening of the fourth independent intake passage formed in the surge tank is disposed so as to face the first opening, and the second opening The lowermost portion of the first opening is positioned vertically above the lowermost portion of the third opening, and the lowermost portion of the first opening is positioned vertically higher than the lowermost portion of the fourth opening. To be formed to Intake manifold and butterflies.

According to the invention described in (5), in addition to the invention described in any of (1) to (4), the first independent intake passage and the third independent intake air are provided in the first cylinder bank of the V-type engine. The passage communicates, and the second independent intake passage and the fourth independent intake passage communicate in parallel with the second cylinder bank. The first independent intake passage and the second independent intake passage are disposed so as to protrude into the surge tank and cross each other. A second opening that is a communication opening of the second independent intake passage and a third opening that is a communication opening of the third independent intake passage are arranged to face each other, and a fourth opening that is a communication opening of the fourth independent intake passage. The opening and the first opening which is the communication opening of the first independent intake passage are arranged to face each other. The lowermost portion of the second opening is formed so as to be positioned vertically above the lowermost portion of the third opening, and the lowermost portion of the first opening is positioned vertically higher than the lowermost portion of the fourth opening. Formed as follows.
Accordingly, the condensed water generated in the surge tank and the water that has entered the surge tank are urged to be discharged from the third opening and the fourth opening, and the first intake flow rate adjustment valve disposed in the first independent intake passage Suppressing the arrival of these waters at the second intake flow rate adjustment valve disposed in the second independent intake passage, the first intake flow rate adjustment valve and the second independent intake flow rate adjustment valve are deteriorated by condensed water, Freezing and sticking can be suppressed.

  (6) The intake manifold according to (5), wherein the fourth independent intake passage is formed so as to monotonously descend from the surge tank side toward the cylinder.

  According to the invention described in (6), in addition to the invention described in (5), the fourth independent intake passage is formed so as to monotonously descend from the surge tank toward the cylinder. Thereby, the water led out from the surge tank to the fourth independent intake passage can reach the cylinder by its own weight and can be prevented from staying in the fourth independent intake passage.

  (7) The intake manifold according to (5) or (6), wherein at least a part of the fourth opening is formed on a bottom surface of the surge tank.

  According to the invention described in (7), in addition to the invention described in (5) or (6), at least a part of the fourth opening is formed on the bottom surface of the surge tank. Thereby, the water that has entered the surge tank can be easily discharged from the surge tank.

  (8) The intake manifold according to any one of (5) to (7), wherein the first intake flow rate adjustment valve is disposed at an intersection of the first independent intake passage, and the second intake flow rate adjustment valve Is disposed at the intersection of the second independent intake passage, and is disposed through the intersection of the first independent intake passage and the intersection of the second independent intake passage, and the first intake flow adjustment valve and the first 2. An intake manifold comprising a shaft (for example, a shaft 33 to be described later) to which an intake flow rate adjusting valve is fixed.

  According to the invention described in (8), in addition to the invention described in any of (5) to (7), the first intake flow rate adjusting valve is disposed at the intersection of the first independent intake passages, and the second An intake flow rate adjusting valve is disposed at the intersection of the second independent intake passages and fixed to a shaft disposed through the intersection of the first independent intake passage and the intersection of the second independent intake passage. Thereby, the intake flow rate adjusting valve disposed in the independent intake passage communicating with each of the first cylinder bank or the second cylinder bank can be fixed to one shaft. Thereby, the number of parts can be reduced.

  (9) The intake manifold according to (8), wherein the shaft is disposed so as not to penetrate the third independent intake passage and the fourth independent intake passage.

  According to the invention described in (9), in addition to the invention described in (8), the shaft is disposed so as not to penetrate the third independent intake passage and the fourth independent intake passage. As a result, since there is no shaft in the third independent intake passage and the fourth independent intake passage where the intake flow rate adjusting valve is not disposed, resistance in the intake passage is prevented from increasing, and between the shaft and the through hole. Water does not enter the shaft support.

  According to the present invention, it is possible to provide an intake manifold that can prevent water in a surge tank from flowing into an independent intake passage in which a regulating valve is disposed and prevent the regulating valve from deteriorating. it can.

It is a top view centering on the intake manifold of the V-type engine which concerns on embodiment of this invention. It is the sectional view on the AA line of FIG. It is the DD sectional view taken on the line of FIG. It is the BB sectional view taken on the line of FIG. It is the elements on larger scale of FIG. It is CC sectional view taken on the line of FIG. It is a perspective exploded view of an intersection part concerning an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The configuration of the intake manifold 20 of the V-type engine 1 will be described with reference to FIGS. 1 to 6. 1 is a top view centering on an intake manifold 20 of a V-type engine 1 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of the intake manifold 20 in FIG. 1, and FIG. 4 is a sectional view taken along the line BB in FIG. 1, FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is a sectional view taken along the line CC in FIG.

  As shown in FIG. 1, the V-type engine 1 according to the present embodiment has six cylinders (not shown), and three cylinders on the left and right are arranged so as to form a predetermined angle with each other. It has a first cylinder bank 11 and a second cylinder bank 12 that house the respective cylinders. Further, an intake manifold 20 is disposed above the valley 13 (see FIG. 4) sandwiched between the first cylinder bank 11 and the second cylinder bank 12, and intake air is introduced into the intake manifold 20 from the upstream intake passage 14. Is supplied.

  As shown in FIGS. 1 to 3, the intake manifold 20 includes a first independent intake passage 21 and a third independent intake passage 23 that communicate with each cylinder of the first cylinder bank 11, and each cylinder of the second cylinder bank 12. A second independent intake passage 22 and a fourth independent intake passage 24 that communicate with each other, a surge tank 25 that serves as a volume for temporarily storing air inside the intake manifold 20, and an upstream intake air that supplies intake air into the surge tank 25 It comprises a passage 14 and an intake air flow rate adjusting unit 30 that adjusts the intake air flow rate to each cylinder.

  Each cylinder of the first cylinder bank 11 communicates with a pair of intake passages including a first independent intake passage 21 and a third independent intake passage 23 that are adjacent to each other at the periphery of the surge tank 25. In addition, each cylinder of the second cylinder bank 12 communicates with a pair of intake passages including a second independent intake passage 22 and a fourth independent intake passage 24 that are adjacent to each other at the peripheral edge of the surge tank 25.

  As shown in FIG. 3, the first independent intake passage 21 and the second independent intake passage 22 are formed so as to protrude into the surge tank 25. Further, the first independent intake passage 21 and the second independent intake passage 22 are formed side by side so as to cross each other at the approximate center of the bottom surface inside the surge tank 25. Therefore, the upper outer walls of the first independent intake passage 21 and the second independent intake passage 22 constitute a part of the bottom surface of the surge tank 25.

  The first independent intake passage 21 communicates with each cylinder of the first cylinder bank 11. The second independent intake passage 22 communicates with each cylinder of the second cylinder bank 12. Specifically, as shown in FIG. 6, the first independent intake passage 21 is joined to the first flange portion 111 of the first cylinder bank 11. Here, FIG. 6 shows a cross section of the first independent intake passage 21 and the first cylinder bank 11, but the second independent intake passage 22 and the second cylinder bank 12 also show the same cross section (not shown). ). That is, similarly to the relationship between the first independent intake passage 21 and the first cylinder bank 11, the second independent intake passage 22 is joined to the second flange portion 121 of the second cylinder bank 12. The joining surface between the first independent intake passage 21 and the first flange portion 111 and the joining surface between the second independent intake passage 22 and the second flange portion 121 are formed upward. These joint surfaces are preferably formed such that the tangent line of the joint surface indicates the upper side in the vertical direction than the horizontal direction. The joint surface between the first flange portion 111 of the first cylinder bank 11 and a third independent intake passage 23 described later, and the joint surface between the second flange portion 121 of the second cylinder bank 12 and a fourth independent intake passage 24 described later are also provided. It is the same.

  The first independent intake passage 21 and the second independent intake passage 22 are formed to intersect with each other, and are a first opening 211 that is an opening on the surge tank 25 side in the first independent intake passage 21, and a second independent intake passage. 22, a first intake flow rate adjustment valve 31 and a second intake flow rate adjustment valve 32 are disposed in the vicinity of the second opening 221 portion, which is an opening on the surge tank 25 side.

As shown in FIG. 3, the third opening 231 that is the opening on the surge tank 25 side in the third independent intake passage 23 that communicates with the first cylinder bank 11 faces the second opening 221 of the second independent intake passage 22. The fourth opening 241 on the surge tank 25 side in the fourth independent intake passage 24 communicating with the second cylinder bank 12 is formed so as to face the first opening 211 of the first independent intake passage 21. .
At least a part of the third opening 231 that is the opening of the third independent intake passage 23 on the surge tank 25 side and the fourth opening 241 that is the opening of the fourth independent intake passage 24 on the surge tank 25 side are at least part of the surge tank. 25 is formed on the bottom surface. Further, the third opening 231 and the fourth opening 241 are formed so as to be located at the peripheral edge inside the surge tank 25.

As shown in FIG. 4, the fourth independent intake passage 24 communicates with each cylinder of the second cylinder bank 12 so as to monotonously descend from the fourth opening 241. This monotonous descent means a state where the axis of the intake passage is always directed downward from the horizontal direction.
FIG. 4 shows a cross section of the fourth independent intake passage 24 and the second cylinder bank 12, but the third independent intake passage 23 and the first cylinder bank 11 also show the same cross section (not shown). That is, like the fourth independent intake passage 24, the third independent intake passage 23 communicates with each cylinder of the first cylinder bank 11 so as to monotonously descend from the third opening 231.

The intake air flow rate adjusting unit 30 will be described with reference to FIGS. FIG. 7 is an exploded perspective view showing the configuration of the intersecting body 40.
As shown in FIG. 2, the intake flow rate adjustment unit 30 includes a first intake flow rate adjustment valve 31 disposed in the first independent intake passage 21 and a second intake flow rate adjustment valve 32 disposed in the second independent intake passage 22. A shaft 33 to which the first intake flow rate adjustment valve 31 and the second intake flow rate adjustment valve 32 are fixed, a drive device 34 that drives the shaft 33, and a link portion 35 that transmits the drive force of the drive device 34 to the shaft 33. And comprising.

The first intake flow adjustment valve 31 and the second intake flow adjustment valve 32 are valves formed so as to block the first independent intake passage 21 or the second independent intake passage 22, respectively, and the center is fixed to the shaft 33, It rotates around the shaft 33.
Further, since the first independent intake passage 21 and the second independent intake passage 22 are arranged so as to intersect with each other, the first intake flow rate adjustment valve 31 and the second intake flow rate adjustment valve 32 are arranged in a straight line. And fixed to one shaft 33.

  The shaft 33 is disposed through a portion where the plurality of first independent intake passages 21 and the plurality of second independent intake passages 22 intersect. Accordingly, one shaft 33 can be shared by the first independent intake passage 21 that communicates with the first cylinder bank 11 and the second independent intake passage 22 that communicates with the second cylinder bank 12. Further, at least a part of the third opening 231 and the fourth opening 241 is formed in the bottom surface of the surge tank 25, so that the shaft 33 does not penetrate the third independent intake passage 23 and the fourth independent intake passage 24.

  The drive device 34 is a device that drives the shaft 33 and is disposed below the intake manifold 20. Further, since the intake manifold 20 is disposed above the trough 13 formed by the first cylinder bank 11 and the second cylinder bank 12, the drive device 34 is similarly disposed above the trough 13. At this time, the drive device 34 is disposed so as to be separated from the bottom surface of the valley portion 13.

  Furthermore, the drive device 34 includes a joint surface between the first flange portion 111 and the first independent intake passage 21 and the third independent intake passage 23, and the second flange portion 121, the second independent intake passage 22 and the fourth independent intake passage. It arrange | positions so that the lowest end part of the drive device 34 may be located below rather than a joint surface with the channel | path 24 (refer FIG.4 and FIG.6).

  The link portion 35 is a member that transmits the driving force of the driving device 34 to the shaft 33. The connecting portion between the link 35 and the shaft 33 is between the predetermined first independent intake passage 21 and the second independent intake passage 22 in the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged. Placed in. Since the link portion 35 is not disposed at the end portion of the shaft 33, the twist of the shaft 33 is suppressed compared to the case where the link portion 35 is disposed at the end portion, and the first intake flow rate adjustment valve 31 and the second intake flow rate adjustment valve 32 are suppressed. The opening accuracy can be improved.

  As shown in FIG. 7, the intersecting portion of the first independent intake passage 21 and the second independent intake passage 22 including the intake flow rate adjusting unit 30 is another portion (residual portion) of the intake manifold 20 as an intersecting portion body 40. It is a separate body.

  As shown in FIG. 7, the intersecting body 40 is formed integrally with an intersecting portion of the first independent intake passage 21 and the second independent intake passage. As shown in FIGS. 2 and 3, the intersecting body 40 and the other parts are a first plane 41 and a second plane 42 that are substantially parallel to the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged. In addition, the first independent intake passage 21 and the second independent intake passage 22 are substantially perpendicular to the arrangement direction of the first independent intake passage 21 and the second independent intake passage 22, and are delimited by a third plane 43 and a fourth plane 44 formed at the ends of the arrangement direction.

  The first plane 41 is a plane that is substantially parallel to the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged and crosses the first independent intake passage 21. Further, the first plane 41 is formed closer to the third opening 231 side of the third independent intake passage 23 than the end of the second opening 221 of the second independent intake passage 22. Accordingly, the first plane 41 does not cross the second independent intake passage 22.

  The second plane 42 is a plane that is substantially parallel to the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged and crosses the second independent intake passage 22. The second plane 42 is formed on the fourth opening 241 side of the fourth independent intake passage 24 with respect to the end of the first opening 211 of the first independent intake passage 21. Therefore, the second plane does not cross the first independent intake passage 21.

  The third plane 43 is substantially perpendicular to the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged, and the upstream side intake passage in the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged. It is formed at the end on the 14 side. The fourth plane 44 is substantially perpendicular to the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged, and is upstream in the direction in which the first independent intake passage 21 and the second independent intake passage 22 are arranged. It is formed at the end opposite to the intake passage 14 side.

  As shown in FIG. 7, the intersecting body 40 includes an upper body 45 serving as an outer wall portion on the upper surface side of the first independent intake passage 21 and the second independent intake passage 22, and the first independent intake passage 21 and the second independent intake passage 21. A lower body 46 constituting the lower surface side of the intake passage 22, a first intake flow rate adjustment valve 31, a second intake flow rate adjustment valve 32 constituting the intake flow rate adjustment unit 30, and a shaft to which these adjustment valves are fixed. 33.

  In the intersection body 40, a first intake flow rate adjustment valve 31 and a second intake flow rate adjustment valve 32 constituting the intake flow rate adjustment unit 30 are fixed between the upper part body 45 and the lower part body 46, and these adjustment valves are fixed. The formed shaft 33 is sandwiched.

  In addition, the link portion 35 passes through a communication portion 47 provided in the lower portion body 46 and protrudes to the lower side of the lower portion body 46 and is connected to a driving device 34 disposed on the lower side of the lower portion body 46 ( (See FIG. 2).

  With reference to FIG. 2 to FIG. 6, the positional relationship of each component in the intake manifold 20 will be described.

  In the approximate center of the intake manifold 20, the first independent intake passage 21 and the second independent intake passage 22 are arranged so as to alternately intersect with each other, and the surge tank 25 and the cylinders of the first cylinder bank 11 or the first cylinder The cylinders of the two-cylinder bank 12 are communicated. Thereby, the capacity | capacitance of the surge tank 25 can be enlarged. In addition, the surge tank 25 is made to correspond to the capacity required for the surge tank 25, for example, the upper end of the surge tank 25 is lowered by the amount that the first independent intake passage 21 and the second independent intake passage 22 protrude to increase the capacity. 25 can be made compact.

  A third opening 231 or a fourth opening 241 is provided along the outer wall of the intake manifold 20, and the third independent intake passage 23 and the fourth independent intake passage 24 are formed in the surge tank 25 and the first cylinder bank 11. And the cylinders of the second cylinder bank 12 communicate with each other.

  In the region of the intake manifold 20 where the independent intake passages 21 to 24 are formed, the bottom surface of the surge tank 25 is formed to be inclined so that the upstream intake passage 14 side is lowered (see FIG. 2). For this reason, it is possible to guide the water generated by condensation in the surge tank 25 to move upstream due to its own weight.

  The first opening 211 of the first independent intake passage 21 and the fourth opening 241 of the fourth independent intake passage 24 are formed so as to face each other, and the second opening 221 of the second independent intake passage 22 and the third independent intake passage 22 are formed. The third opening 231 of the intake passage 23 is formed to face each other.

  As shown in FIGS. 4 and 5, the lowermost portion (line P in FIG. 5) of the first opening 211 of the first independent intake passage 21 is the first portion of the fourth independent intake passage 24 formed so as to face this. It is formed so as to be positioned higher than the lowermost part of the four openings 241 (line Q in FIG. 5), that is, vertically above. Since the first opening 211 of the first independent intake passage 21 is positioned higher than the fourth opening 241 of the fourth independent intake passage 24, the water generated in the surge tank 25 is disposed in the first independent intake passage 21. It is possible to prevent the first intake flow rate adjusting valve 31 from being reached. Note that the water in the surge tank 25 reaches the cylinders of the second cylinder bank 12 from the fourth opening 241 via the fourth independent intake passage 24 and burns by the heat in the cylinders, and is exhausted (not shown). ).

  Similarly, the relationship between the second opening 221 of the second independent intake passage 22 and the third opening 231 of the third independent intake passage 23 is such that the lowermost portion of the second opening 221 is perpendicular to the lowermost portion of the third opening 231. It is formed so as to be located at a high position above the direction.

Therefore, water generated in the surge tank 25 is prevented from entering the first independent intake passage 21 and the second independent intake passage 22 and led to the third independent intake passage 23 and the fourth independent intake passage 24 by its own weight. It becomes possible to make it.
This suppresses water from reaching the first intake flow rate adjustment valve 31 and the second intake flow rate adjustment valve 32 as the valves disposed in the first independent intake passage 21 and the second independent intake passage 22, and It is possible to prevent the bulb from being deteriorated by moisture or freeze-fixed.

  The third independent intake passage 23 and the fourth independent intake passage 24 are formed so as to monotonously descend toward the respective cylinders of the first cylinder bank 11 or the second cylinder bank 12, so that the water in the surge tank 25 can be reduced. However, the cylinder can reach the cylinder by its own weight without staying in the third independent intake passage 23 or the fourth independent intake passage 24.

As shown in FIG. 5, the lowermost part (line P) of the first opening 211 of the first independent intake passage 21 is the lowermost part (line P) of the third opening 231 of the third independent intake passage 23 formed adjacent thereto. It is formed so as to be positioned higher than the line R), that is, vertically above.
Thereby, it is possible to further suppress the water generated in the surge tank 25 from flowing into the first independent intake passage 21.

  Further, as described above, the bottom surface in the surge tank 25 is formed so that the upstream side intake passage 14 side is lowered and is raised toward the back, so that the surge tank 25 has invaded or occurred. It is possible to prevent water from staying in the back of the surge tank 25 (on the side opposite to the upstream side intake passage 14 side).

  The intersecting body 40 is arranged so that a first intake flow rate adjustment valve 31 and a second intake flow rate adjustment valve 32 constituting the intake flow rate adjustment unit 30 and a shaft 33 to which these adjustment valves are fixed are sandwiched. Then, the driving device 34 is disposed below the lower body 46 via the link portion 35 that passes through the communication portion 47 of the intersecting body 40. For this reason, the drive device 34 that drives the shaft 33 is accommodated in the space below the intake manifold 20 and in the valley portion 13. Therefore, it is possible to effectively utilize the space of the valley portion 13 and to prevent the drive device 34 from being subjected to an impact or being flooded with water generated in the surge tank 25.

The assembly of the intake manifold 20 will be described.
In order to assemble the intake manifold 20, first, the link portion 35 is passed through the communication portion 47 of the lower portion body 46, and the first intake flow rate adjusting valve 31 and the second intake flow rate adjusting valve 32 fixed to the shaft 33 are connected to the lower portion body. 46. Next, the upper part body 45 is placed on them and the intersecting part body 40 is assembled and fixed to the remaining part body, which is the other part of the intake manifold 20.

  The independent intake passages 21 to 24 of the intake manifold 20 in a state in which the intersecting body 40 is fixed are aligned with the positions of the first flange portion 111 of the first cylinder bank 11 and the second flange portion 121 of the second cylinder bank 12, respectively. The intake manifold 20 is placed above the valley 13 formed between the first cylinder bank 11 and the second cylinder bank 12.

  At this time, the drive device 34 of the intake flow rate adjustment unit 30 is disposed on the lower surface side of the intake manifold 20, but does not contact the bottom surface of the valley portion 13. For this reason, the drive device 34 can be stored in the space of the valley portion 13 and the drive device 34 is not directly affected by vibrations or the like generated from the cylinders in the first cylinder bank 11 and the second cylinder bank 12. be able to.

  Further, since the joint surfaces of the independent intake passages 21 to 24 and the first flange portion 111 and the second flange portion 121 are formed so as to face upward, each passage of the independent intake passages 21 to 24 is connected to the first flange portion. The V-type engine 1 can be easily assembled by simply aligning and fixing to the 111 or the second flange portion 121.

  Further, a crossing portion of the first independent intake passage 21 and the second independent intake passage 22 in the surge tank 25 is made a separate portion as an intersection portion body 40 and the intake flow rate adjusting portion 30 is assembled in advance, and then the remaining portion of the surge tank 25 Therefore, the intersecting portion 40 having a complicated shape can be formed separately from the remaining portion of the intake manifold 20. For this reason, productivity and product accuracy can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in this embodiment, one cylinder has two intake passages (first independent intake passage 21 and third independent intake passage 23, etc.) arranged in parallel, and one intake passage (first Although the intake flow rate adjusting valve (the first intake flow rate adjusting valve 31 or the like) is arranged in the independent intake passage 21 or the like, the present invention is not limited to this. For example, in one intake passage, the intake passage length may be varied by branching into two passages having different lengths in the middle, and arranging an intake flow rate adjusting valve on one of the passages so as to switch according to the engine speed. It may be.

  In the present embodiment, the intake manifold 20 used in the V-type engine 1 is used. However, the present invention is not limited to this, and may be applied to an intake manifold of an L-type engine.

DESCRIPTION OF SYMBOLS 1 V type engine 11 1st cylinder bank 12 2nd cylinder bank 13 Valley 14 Upstream intake passage 20 Intake manifold 21 1st independent intake passage 22 2nd independent intake passage 23 3rd independent intake passage 24 4th independent intake passage 25 Surge tank 31 First intake flow rate adjustment valve 32 Second intake flow rate adjustment valve 33 Shaft 34 Drive device 35 Link part 40 Cross body 45 Upper part body 46 Lower part body

Claims (8)

An intake manifold having a surge tank, and a plurality of independent intake passages that connect the surge tank and the plurality of cylinders and supply intake air to the cylinders;
The plurality of independent intake passages are:
A first independent intake passage and a third independent intake passage adjacent to each other in said surge tank and the first cylinder and communicating, the periphery of the surge tank,
A second independent intake passage and a fourth independent intake passage, which communicate with the surge tank and the second cylinder, and are adjacent to each other at a peripheral portion of the surge tank;
Have
The first independent intake passage and the second independent intake passage are formed so as to protrude into the surge tank, and are formed so as to intersect each other at the protruding portion.
A shaft disposed through the intersection of the first independent intake passage and the intersection of the second independent intake passage formed by protruding into the surge tank;
An intake flow rate adjusting valve fixed to the shaft, the first intake flow rate adjusting valve disposed at an intersection of the first independent intake passage, and a second disposed at an intersection of the second independent intake passage. An intake flow adjustment valve;
With
The lowermost portion of the first opening, which is the communication opening of the first independent intake passage formed in the surge tank, is the lowermost portion of the third opening, which is the communication opening of the third independent intake passage formed in the surge tank. The lowermost part of the second opening, which is located above the vertical direction and is a communication opening of the second independent intake passage formed in the surge tank, is the fourth independent intake formed in the surge tank. An intake manifold formed so as to be positioned vertically above a lowermost portion of a fourth opening which is a communication opening of a passage . The intake manifold according to claim 1,
The first cylinder is housed in a first cylinder bank of a V-type engine, and the second cylinder is housed in a second cylinder bank of the V-type engine;
  The first independent intake passage and the third independent intake passage communicate with the surge tank from a peripheral portion on the first cylinder bank side of the surge tank,
  The second independent intake passage and the fourth independent intake passage communicate with the surge tank from a peripheral portion on the second cylinder bank side of the surge tank,
  The first opening and the fourth opening are opposed to each other, and the second opening and the third opening are opposed to each other.
  The lowermost part of the first opening is formed so as to be positioned vertically above the lowermost part of the fourth opening, and the lowermost part of the second opening is perpendicular to the lowermost part of the third opening. An intake manifold formed so as to be positioned upward in the direction. The intake manifold according to claim 1 or 2 ,
An upstream intake passage is connected upstream of the surge tank,
The intake manifold is characterized in that a bottom surface of the surge tank is disposed so as to incline vertically upward from an inlet portion to which the upstream intake passage is connected. The intake manifold according to any one of claims 1 to 3 ,
The intake manifold, wherein the third independent intake passage is formed so as to monotonously descend from the surge tank side toward the cylinder. The intake manifold according to any one of claims 1 to 4 ,
An intake manifold, wherein at least a part of the third opening is formed on a bottom surface of the surge tank. The intake manifold according to any one of claims 1 to 5 ,
The intake manifold is characterized in that the fourth independent intake passage is formed so as to monotonously descend from the surge tank side toward the cylinder. The intake manifold according to any one of claims 1 to 6 ,
An intake manifold, wherein at least a part of the fourth opening is formed on a bottom surface of the surge tank. The intake manifold according to any one of claims 1 to 7 ,
The intake manifold according to claim 1, wherein the shaft is disposed so as not to penetrate the third independent intake passage and the fourth independent intake passage.

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