JP2006307758A - Intake manifold of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the mounting performance of an intake manifold on an engine compartment by reducing the size of the intake manifold. <P>SOLUTION: In this intake manifold of the engine, a plurality of intake pipes extending from the outer peripheral surface of a surge tank are bent to the engine side so as to cover the surge tank from the anti-engine side to the upper side and communicated with a manifold mounting flange. A butterfly valve is mounted to a rotating shaft extending in the direction of a cylinder row through branch pipes connected to intermediate parts of a plurality of the intake pipes. The axial end of the rotating shaft is extended from one side of the surge tank in the direction of the cylinder row to the outside, and an actuator is mounted so as to be extended in a direction crossing perpendicularly to the rotating shaft and communicated with the shaft end of the rotating shaft. The surge tank is so installed that one side thereof in the direction of the cylinder row is retreated to the side of the cylinder adjacent to the other side thereof in the direction of the cylinder row, and the actuator is mounted on one side of the retreated surge tank in the direction of the cylinder row starting at the axial end of the rotating shaft toward the manifold mounting flange so that the actuator can be positioned under the intake pipes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake manifold for an engine, and more particularly, to an intake manifold for an engine that can reduce the size of the intake manifold and can be mounted on an engine room.

  An intake manifold is attached to the engine mounted in the engine room of the vehicle as an intake system. The intake manifold of the engine has a surge tank and a manifold mounting flange extending in the direction of the cylinder row of the engine, and a plurality of intake pipes extending from the outer peripheral surface of the surge tank are disposed along the outer peripheral surface of the surge tank on the non-engine side In order to cover the upper side of the surge tank, it is bent to the engine side and connected to the manifold mounting flange, and branch pipes extending inside the surge tank are connected to the middle of the intake pipes. A butterfly valve that switches the communication state of each branch pipe to the surge tank is installed on the rotary shaft that passes through each branch pipe and extends in the cylinder row direction, and the shaft end of the rotary shaft is outward from the cylinder row direction side of the surge tank. One side of the surge tank in the cylinder row direction so that the actuator that opens and closes the butterfly valve extends in the direction perpendicular to the rotation axis Is that contact the shaft end portion is attached.

In the conventional intake manifold of an engine, an actuator for opening and closing a butterfly valve provided on a branch pipe is attached to one side of the surge tank in the cylinder row direction so as to extend away from the engine and upward. is there.
JP 2003-193847 A

In addition, in an intake manifold of a conventional engine, an actuator that opens and closes a butterfly valve provided in a branch pipe is attached to one side in the cylinder row direction of the surge tank so as to extend close to the engine and downward. There is something.
Japanese Patent Laid-Open No. 10-299594

  However, in the conventional intake manifold having the structure shown in Patent Documents 1 and 2, the actuator for opening and closing the butterfly valve is not extended to the intake pipe covering the upper part of the surge tank. The surge tank is attached to one side in the cylinder row direction of the surge tank so as to protrude in the opposite direction (the direction away from the engine) from the exit direction (the direction close to the engine) and protrude upward. It was attached to one side of the cylinder row direction.

  For this reason, the conventional intake manifold has a problem that the actuator is disposed in a state where the actuator protrudes to one side in the cylinder row direction of the surge tank, so that the size of the conventional intake manifold is increased and the mountability in the engine room is deteriorated. In addition, when the actuator is mounted on one side in the cylinder row direction of the surge tank so that it protrudes downward, there is a risk of interference with engine auxiliary equipment arranged below the intake manifold, and there is a problem that the layout is restricted. there were.

  According to the present invention, a surge tank and a manifold mounting flange are extended in the cylinder row direction of the engine, and a plurality of intake pipes extending from the outer peripheral surface of the surge tank are disposed upward along the outer peripheral surface of the surge tank on the side opposite to the engine. When the engine is started up, it is curved toward the engine so as to cover the upper side of the surge tank and communicates with the manifold mounting flange, and branch pipes extending inside the surge tank are respectively provided in the middle portions of the plurality of intake pipes. A butterfly valve for switching the communication state of each branch pipe to the surge tank is attached to a rotary shaft extending through the branch pipes in the cylinder row direction, and the shaft end of the rotary shaft is connected to the cylinder of the surge tank. An actuator that extends outward from one side in the row direction and opens and closes the butterfly valve extends in a direction perpendicular to the rotation axis In the intake manifold of the engine attached to one side of the surge tank in the cylinder row direction and connected to the shaft end, the cylinder side of the surge tank in the cylinder row direction is retracted to the adjacent cylinder side on the other side of the cylinder row direction. The actuator is attached to one side of the retreated surge tank in the cylinder row direction so as to go from the shaft end portion toward the manifold attachment flange, and the actuator is positioned below the intake pipe.

  The intake manifold of the engine of the present invention is provided by retracting one side of the surge tank in the cylinder row direction to the adjacent cylinder side on the other side of the cylinder row direction, and the actuator is pivoted on one side of the retreated surge tank in the cylinder row direction. Mounting from the end toward the manifold mounting flange and positioning the actuator on the lower side of the intake pipe prevents the actuator from projecting away from the engine, thereby reducing the size of the intake manifold. At the same time, the mountability to the engine room can be improved.

The intake manifold of the engine of the present invention is mounted on one side in the cylinder row direction of a surge tank that is retracted to the adjacent cylinder side on the other side in the cylinder row direction so that the actuator is directed from the shaft end toward the manifold mounting flange. By being positioned below the intake pipe, the actuator can be prevented from projecting away from the engine, the intake manifold can be miniaturized, and the mountability to the engine room can be improved. .
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 6 show an embodiment of the present invention. 5 and 6, 2 is an engine mounted vertically in an engine room of a vehicle (not shown), 4 is a cylinder block, 6 is a cylinder head, 8 is a head cover, 10 is a crank lower case, and 12 is a transmission. It is a mounting part. The engine 2 has four cylinders (not shown) arranged in series from the front side to the rear side of the vehicle, and a transmission (not shown) is attached to the transmission attachment portion 12 of the cylinder block 4. A starter motor 14 is attached to the transmission attachment portion 12.

  The engine 4 is provided with an intake manifold attachment surface 16 on the right side of the cylinder head 6 attached above the cylinder block 4, and an intake manifold 18 is attached to the intake manifold attachment surface 16. The engine 4 has an exhaust manifold (not shown) attached to an exhaust manifold attachment surface (not shown) on the left side of the cylinder head 6.

  As shown in FIGS. 1 to 4, the intake manifold 18 is provided with a surge tank 20 and a manifold mounting flange 22 that extend in the cylinder row direction A of the engine 2, and extends from the surge tank 20 to the manifold mounting flange 22. Four intake pipes 24 to be connected are provided.

  The surge tank 20 has a tank chamber 26 extending in the cylinder row direction A as shown in FIG. The manifold attachment flange 22 is attached to the intake manifold attachment surface 16 on the right side of the cylinder head 6 by attachment bolts (not shown).

  One end of each of the four intake pipes 24 is connected to the lower outer peripheral surface of the surge tank 20, and an intermediate portion is along the outer peripheral surface of the surge tank 20 on the side opposite to the engine 2 (the side away from the engine 2). While rising upward, it is curved to the side close to the engine 2 so as to cover the upper side of the surge tank 20, and the other end side is connected to the manifold mounting flange 22.

  Each of the four intake pipes 24 communicates with the lower portion of the tank chamber 26 at one end side, and forms an intake passage 28 whose intermediate portion is curved along the outer periphery of the surge tank 20 and whose other end side opens to the manifold mounting flange 22. is doing. The four intake passages 28 communicate with the intake ports 30 of the respective cylinders that open to the intake manifold mounting surface 16 of the cylinder head 6.

  A branch pipe connection portion 32 extending inside the tank chamber 26 of the surge tank 20 is provided at an intermediate portion of the four intake pipes 24, and a branch pipe 34 is connected to each of the branch pipe connection portions 32. The four branch pipes 34 each form a branch passage 36 that connects the tank chamber 26 to each intake passage 28.

  The four branch pipes 34 are provided through a rotating shaft 38 extending in the cylinder row direction A. A butterfly valve 40 for switching the communication state of the branch passage 34 formed by each branch pipe 32 to the tank chamber 26 of the surge tank 20 is mounted on the rotary shaft 38.

  As shown in FIG. 3, the rotary shaft 38 has a shaft end portion 42 on one end side extending outward from an end portion on the one side in the cylinder row direction A (rear side of the vehicle) of the surge tank 20. A tank side mounting portion 44 is provided on one side in the cylinder row direction A of the surge tank 20, and an actuator 48 that opens and closes the butterfly valve 40 is attached to the tank side mounting portion 44 via an actuator mounting member 46.

  The actuator attachment member 46 is provided with an actuator side attachment portion 50 attached to the tank side attachment portion 44, and an extension portion 52 extending from the actuator side attachment portion 50 toward the manifold attachment flange 22 is provided. A shaft end portion 42 of the rotary shaft 38 protrudes from the actuator side mounting portion 50 so as to be rotatable, and a lever 54 is attached to a protruding tip of the shaft end portion 42. The actuator 48 is attached to the extension 52 so that the axis C2 extends in a direction orthogonal to the axis C1 of the rotary shaft 38.

  The actuator 48 is provided with a diaphragm-type negative pressure operating portion 56 that operates by introducing negative pressure. The actuator 48 extends from the negative pressure operating portion 56 along the axis C2 and communicates with the lever 54 of the shaft end portion 42. A rod 58 is provided. The actuator 48 pushes and retracts the rod 58 in the direction of the axis C2 by the negative pressure introduced into the negative pressure operating unit 56, and rotates the rotary shaft 38 by the lever 54 to open and close the butterfly valve 40.

  Further, as shown in FIG. 4, the surge tank 20 is provided with a throttle body mounting flange 60 at an end portion on the other side in the cylinder row direction A (front side of the vehicle). A throttle body 62 is attached to the throttle body attachment flange 60. An air cleaner outlet pipe (not shown) is connected to the throttle body 62.

  As shown in FIG. 1, the intake manifold 18 of the engine 2 has a tank side mounting portion 44 provided at one end of the surge tank 20 on one side in the cylinder row direction A to the adjacent cylinder side on the other side in the cylinder row direction A. Retired and provided. As shown in FIG. 3, the actuator 48 is moved from the shaft end 42 to the manifold mounting flange 22 by the actuator mounting member 46 on the tank side mounting portion 44 on the one side in the cylinder row direction A of the retreated surge tank 20. The actuator 48 is mounted on the lower side of the intake pipe 24.

  2, when viewed from the cylinder row direction A, the intake manifold 18 extends obliquely upward from the manifold mounting flange 22 and then extends downward to allow the intake pipe 24 to extend downward. A space 64 is formed on the lower side. An actuator 48 is positioned in the space 64.

  Next, the operation will be described.

  The engine 2 adjusts air taken in from an air cleaner (not shown) by a throttle valve (not shown) built in the throttle body 62 and introduces the air into the surge tank 20 of the intake manifold 18 via each intake pipe 24 via the intake port 30. Supply to each cylinder.

  When the engine 2 rotates at a low speed, the butterfly valve 40 is closed by the actuator 48 to close the branch passage 36, and the passage length from the tank chamber 26 of the surge tank 20 to the intake port 30 is lengthened. Increase the efficiency of intake air intake. Further, when the engine 2 rotates at high speed, the actuator 48 opens the butterfly valve 40 to open the branch passage 36, shortens the passage length from the tank chamber 26 of the surge tank 20 to the intake port 30, and the inertia effect. Increase intake air charging efficiency in high-speed operation.

  The intake manifold 18 of the engine 2 retreats the tank side mounting portion 44 on one side in the cylinder row direction A of the surge tank 20 to the adjacent cylinder side on the other side in the cylinder row direction A, and the cylinder of the surge tank 20 thus retreated. An actuator 48 is attached to the tank side attachment portion 44 on the one side in the column direction A so that the axis C2 is directed from the shaft end portion 42 to the manifold attachment flange 22, and the actuator 48 is positioned below the intake pipe 24.

  As a result, the intake manifold 18 can prevent the actuator 48 from protruding in a direction away from the engine 2, and thus the intake manifold 18 can be reduced in size and mounted in the engine room. be able to.

  Further, when viewed from the cylinder row direction A, the intake manifold 18 extends the intake pipe 24 obliquely upward from the manifold mounting flange 22 and then extends downward to provide a space 64 below the intake pipe 24. And the actuator 48 is positioned in the space 64.

  As a result, the intake manifold 18 can be disposed close to the actuator 48 below the intake pipe 24 that extends obliquely upward from the manifold mounting flange 22 and then extends downward. Therefore, the intake manifold 18 can be reduced in size and the mountability in the engine room can be improved.

  7 and 8 show modifications. The intake manifold 18 is attached to a rotating shaft 38 between two branch pipes 34 located on the intermediate side of the four branch pipes 34 disposed in the tank chamber 26 of the surge tank 20 extending in the cylinder row direction A. A lever 66 is attached, and the surge is placed below the two intake pipes 24 located between the four intake pipes 24 arranged in the cylinder row direction A and between the two intake pipes 24. A negative pressure operating portion 56 of an actuator 48 is attached to the outer peripheral surface of the tank 20 facing the engine 2, and a rod 58 extending from the negative pressure operating portion 56 into the tank chamber 26 is connected to a lever 66.

  The intake manifold 18 has a lever 66 attached to a rotary shaft 38 in the tank chamber 26 of the surge tank 20, and is below the two intake pipes 24 located on the intermediate side and between the two intake pipes 24. The actuator 48 is attached to the outer peripheral surface of the surge tank 20 so as to be positioned at the position, so that the actuator 48 does not protrude from the surge tank 20 and the intake manifold 18 can be reduced in size. Mountability can be improved.

  The intake manifold of the engine of the present invention is intended to reduce the size of the intake manifold and improve the mountability in the engine room, and can be applied to various drive machines equipped with the engine in addition to vehicles such as automobiles. it can.

It is a right view of the intake manifold which shows an Example. It is sectional drawing by the II-II line | wire of FIG. 1 which shows an Example. It is a rear view of the intake manifold which shows an Example. It is a front view of the intake manifold which shows an Example. It is a back perspective view of an engine provided with an intake manifold which shows an example. It is a right view of the engine provided with the intake manifold which shows an Example. It is a right view of the intake manifold which shows a modification. It is sectional drawing by the VIII-VIII line of FIG. 7 which shows an Example.

Explanation of symbols

2 Engine 4 Cylinder block 6 Cylinder head 8 Head cover 10 Crank lower case 14 Starter motor 18 Intake manifold 20 Surge tank 22 Manifold mounting flange 24 Intake pipe 26 Tank chamber 28 Intake passage 34 Branch pipe 36 Branch passage 38 Rotary shaft 40 Butterfly valve 42 Shaft end Part 46 Actuator mounting member 48 Actuator 62 Throttle body 64 Space

Claims (2)

  A surge tank and a manifold mounting flange are extended in the cylinder row direction of the engine, and a plurality of intake pipes extending from the outer peripheral surface of the surge tank are raised upward along the outer peripheral surface of the surge tank on the side opposite to the engine. , Bent to the engine side so as to cover the upper side of the surge tank and communicated with the manifold mounting flange, and branch pipes extending inward of the surge tank are respectively connected to intermediate portions of the plurality of intake pipes. A butterfly valve for switching the communication state of each branch pipe to the surge tank is attached to a rotary shaft that passes through each branch pipe and extends in the cylinder row direction, and the shaft end of the rotary shaft is connected to one side in the cylinder row direction of the surge tank. The surge is extended so as to extend in an orthogonal direction to the rotation axis, and an actuator that opens and closes the butterfly valve. In the intake manifold of the engine that is attached to one side of the cylinder in the cylinder row direction and communicates with the shaft end portion, the one side of the surge tank in the row direction of the surge tank is retreated to the adjacent cylinder side on the other side of the cylinder row direction. Intake of an engine characterized in that the actuator is attached to one side of the retreated surge tank in the cylinder row direction so as to go from the shaft end toward the manifold attachment flange, and the actuator is positioned below the intake pipe. Manifold.   When the intake manifold is viewed from the cylinder row direction, the intake pipe extends obliquely upward from the manifold mounting flange and then extends downward to form a space below the intake pipe. 2. The intake manifold for an engine according to claim 1, wherein the actuator is positioned in the intake manifold.

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