JP4626409B2 - Engine intake manifold - Google Patents

Description

  The present invention relates to an intake manifold for an engine.

  In the intake manifold of an engine, various ideas have been made regarding how the pipe bends due to layout restrictions. In FIG. 8, the branch portion 1 a of the intake manifold 1 is inclined upward halfway and a curved portion 4 is formed so as to face downward at a connection portion with the intake port 3 of the cylinder head 2. Does not protrude upward from the cylinder head 2 (Patent Document 1). 6 is a butterfly-type swirl control valve, which is attached to the intake port 3 side from the curved portion 4 of the intake manifold 1, and from the position continuous with the valve body 7 of the swirl control valve 6 when fully opened, to the curved portion 4 upstream. A rectifying plate 5 that is curved along is provided. A vaporizer 9 is attached to the proximal end portion of the intake manifold 1.

When the load is low, the swirl control valve 6 is held in the fully closed position, the flow rate of the intake air flowing from the intake manifold 1 through the intake port 3 into the cylinder is increased, and the intake swirl is generated in the cylinder. When the load is high, the swirl control valve 6 is held in the fully open position and continues to the rectifying plate 5 along the curved portion 4, so that the intake air flows smoothly to the swirl control valve 6 along the rectifying plate 5. The resistance that the control valve 6 gives to the flow of intake air can be reduced.
Reality 7-7549

  In the case of Patent Document 1, the flow of the intake air along the rectifying plate 5 is smooth, but the intake air flowing inside the straight plate 5 collides with the swirl control valve 6 in the fully open position while going straight upward from the upstream side of the curved portion 4. There is no doubt. When the swirl control valve 6 is fully opened, the valve plate 7 is in parallel with the intake port 3, so that the input due to the collision of the intake air becomes large in an operating state where the flow velocity of the intake air increases, and the valve plate 7 and the valve shaft 8 are deformed or damaged. May occur.

  An object of the present invention is to provide an effective countermeasure for such a problem.

The first invention includes a surge tank which is connected via the flange openings corresponding to the intake ports of the cylinder head, and swirl control valve butterfly to open and close an opening of the flange, the direction of opening of said flange intersects to be provided with a conduit for introducing the intake air into the surge tank from the direction of said surge tank to be curved away from the opening of the flange to the flow of the intake air is introduced from the conduit toward the swirl control valve to the formation of the convex portion as from directs inward to extend inwardly of the surge tank surrounds the opening of the flange to vary the flow of air toward the swirl control valve provided in an opening of said flange It is characterized by.

The second invention is the intake manifold according to claim 1, wherein the swirl control valve, and characterized in that the valve plate is set such that the flange opening Ru parallel to name and direction of the intake air flow flowing in the full open To do.

A third invention, the convex portion is characterized in that set to Kakoeru around the fully closed valve plate.

  In the first invention, the intake air introduced into the surge tank from the direction intersecting with the direction of the opening of the flange flows from the surge tank through the opening of the flange to the intake port. The flow of intake air from the direction intersecting the direction of the swirl to the swirl control valve is changed to the flow of intake air flowing into the swirl control valve from the direction along the direction of the opening of the flange. For this reason, if the swirl control valve is fully opened in the operating state where the flow velocity of the intake air is increased and the valve plate is set to be parallel to the direction of the opening of the flange, the flow of the intake air will collide with the valve plate when fully opened. The intake air flows smoothly along the valve plate when fully open. The convex portion is formed so as to extend to the inside of the surge tank so as to surround the opening of the flange, but the resistance given to the flow of the intake air can be kept small by the rectifying function that changes the direction of the flow of the intake air.

  In the second aspect of the invention, if the swirl control valve is set to be fully closed when the intake flow velocity is weakened while the intake valve is fully open when the intake flow velocity is strong, the intake flow is In addition to avoiding collision with the valve plate, it is assumed that a swirl control valve is provided only at the opening of the flange corresponding to one of the two intake ports in an engine having two intake ports for each cylinder. The surge tank distributes the intake air introduced from the direction crossing the direction of the opening of the flange to the two intake ports of each cylinder, and the flange corresponding to one intake port by the valve plate when fully closed The flow of intake air to the opening of the flange corresponding to the other intake port while suppressing the flow of intake air to the opening of It becomes possible to concentrate.

  In the third invention, assuming that the swirl control valve is provided only at the opening of the flange corresponding to one of the two intake ports of each cylinder, the entire circumference of the valve plate when fully closed is surrounded by the convex portion. Thus, by blocking the flow of intake air to the opening of the flange corresponding to one intake port, it becomes possible to concentrate the entire amount of intake air to the opening of the flange corresponding to the other intake port.

  2 and 3, the intake manifold 10 is applied to an engine having two intake ports for each cylinder, and is attached to the side surface of the cylinder head 11 as shown in FIG. The intake manifold 10 includes a flange 12 that forms a mounting surface with the cylinder head 11, a surge tank 14 that is connected to each intake port via the opening 13 of the flange 12, and a direction that intersects the direction of the opening 13 of the flange 12. And a conduit 15 for introducing intake air into the surge tank 14.

  The surge tank 14 distributes the intake air introduced from the direction intersecting the direction of the opening 13 of the flange 12 to each cylinder, and the opening 13a, 13b corresponding to the two intake ports has one opening 13a. Only the butterfly-type swirl control valve 16 is arranged. The swirl control valve 16 includes a valve shaft 18 and a valve plate 17, and in the illustrated case, a common valve shaft 18 that connects the valve plates 17 is rotatably supported by the surge tank 14. An operating rod 19a of an actuator 19 (diaphragm) is connected to one end of a valve shaft 18 protruding from the surge tank 14 to the outside, and a valve plate 17 that rotates integrally with the valve shaft 18 as the operating rod 19a expands and contracts is provided in the opening of the flange 12. 13a is opened and closed.

  For the two intake ports of each cylinder, for example, one is set as a direct port and the other is set as a spiral port. The direct port is connected to the surge tank 14 via the swirl control valve 16, and the actuator 19 is driven by control means (not shown) to fully close the swirl control valve 16 at low load, while the swirl control valve 16 at high load. Is fully opened. When the swirl control valve 16 is fully closed, the valve plate 17 is orthogonal to the flow of intake air flowing in from the direction along the direction of the opening 13a of the flange 12, and when fully opened, the valve plate 17 is parallel to the direction of the opening 13a of the flange 12. It is set to be.

  The intake air introduced into the surge tank 14 from the direction intersecting the direction of the opening 13a of the flange 12 flows from the surge tank 14 through the opening 13 of the flange 12 to the intake port of each cylinder. In order to protect the swirl control valve 16, the flow of intake air from the direction intersecting the direction of the opening 13a of the flange 12 to the swirl control valve 16 is curved, and the direction from the direction along the direction of the opening 13a of the flange 12 to the swirl control valve 16 The convex portion 20 is formed in a bell mouth shape that surrounds the opening 13a of the flange 12 and extends to the inside of the surge tank 14 in order to change to the flow of the intake air (see FIG. 4).

  The convex portion 20 may be provided only for the swirl control valve 16 </ b> A because of the positional relationship with the pipe line 15. If the swirl control valve 16A is not subjected to rectification by the convex portion 20, the flow of the intake air introduced from the conduit 15 to the surge tank 14 becomes parallel to the valve plate 17 when fully opened (the direction of the opening 13a of the flange 12). However, with respect to the other swirl control valve 16, the intake air introduced from the conduit 15 flows through the surge tank 14 in the cylinder arrangement direction and flows into the valve plate 17 in the fully opened state in parallel therewith. This is because there is almost no collision input due to the flow of intake air to the valve plate 17.

  With this configuration, the flow of the intake air from the direction intersecting the direction of the opening 13a of the flange 12 to the swirl control valve 16 flows into the swirl control valve 16 from the direction along the direction of the opening 13a of the flange 12 by the convex portion 20. It can be changed to the flow of intake air. For this reason, in the swirl control valve 16A, the flow of the intake air can be prevented from colliding with the valve plate 17 when fully opened as shown in FIG. 5, and the intake air flows smoothly along the valve plate 17 when fully opened. . The convex portion 20 is formed so as to surround the opening 13a of the flange 13 and extend to the inside of the surge tank 14. However, the rectifying function that changes the direction of the intake flow by curving the intake flow also provides resistance to the intake flow. Can be kept small. Without the convex portion 20, as shown in FIG. 6, the intake air flows upward from the conduit 15 through the surge tank 14 as indicated by the arrow, flows to the swirl control valve 16A, and collides with the valve plate 17 when fully opened. Therefore, at the time of a high load at which the flow velocity of the intake air increases, the input due to the collision of the intake air is large, and the valve plate 17 and the valve shaft 18 may be deformed or damaged.

  When the convex portion 20 is extended so as to surround the entire circumference of the valve plate 17 that is orthogonal to the flow of intake air flowing in when fully closed, the valve plate 17 causes the flange 12 on the side of the direct port as shown in FIG. The opening 13a is closed without a gap, and the entire amount of intake air can be concentrated in the spiral port.

1 is a perspective view of an engine according to an embodiment of the present invention. It is the structure explanatory drawing of an intake manifold similarly. FIG. 3 is a view taken along arrow A in FIG. 2. It is a principal part sectional view of an intake manifold similarly. It is explanatory drawing which concerns on the flow of the intake air in the same case with a convex part. It is explanatory drawing which concerns on the flow of an intake in the case where there is similarly no convex part. It is a principal part sectional view of an intake manifold similarly. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Intake manifold 11 Cylinder head 12 Flange 13, 13a, 13b Flange opening 14 Surge tank 15 Pipe line 16, 16A Swirl control valve 17 Valve plate 18 Valve shaft 20 Convex part

Claims (3)

A surge tank which is connected via the flange openings corresponding to the intake ports of the cylinder head, and swirl control valve butterfly to open and close the opening of the flange, the surge tank in the direction intersecting the direction of opening of the flange be provided with a conduit for introducing the intake air into, is introduced from the conduit by bending the flow of intake air toward the swirl control valve directs inward of the surge tank away from the opening of the flange from the engine, characterized in that the formation of the convex portion so as to extend inwardly of the surge tank surrounds the opening of the flange to vary the flow of air toward the swirl control valve provided in an opening of said flange Intake manifold. The swirl control valve, an intake manifold according to claim 1, characterized in that the valve plate at the time of full opening is set such that the flange opening Ru parallel to name and direction of the intake air flow flowing in. The intake manifold according to claim 2, wherein the convex portion is set so as to surround the periphery of the valve plate when fully closed.

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