JP4719716B2 - Engine intake control device - Google Patents

Description

  The present invention includes an intake passage body attached to an engine, a first intake passage formed in the intake passage body and having a downstream end connected to an intake port of the engine, formed in the intake passage body, and downstream of the intake port. A second intake passage to which an end is connected; a valve shaft rotatably supported on the intake passage body; and a switching valve comprising a valve plate attached to the valve shaft. A first switching position for closing the second intake passage and turning the first intake passage to the intake port by rotating a shaft, and closing the first intake passage and connecting the second intake passage to the intake port. The present invention relates to an improvement in an intake control device for an engine that is rotated between a second switching position and a second switching position.

Such an intake control device for an engine is already known as disclosed in Patent Document 1.
JP 2000-234522 A

  In such an intake control device for an engine, the switching valve is composed of a valve shaft and a valve plate attached to the valve shaft and extending only to one side thereof, and the valve plate is cantilevered. Therefore, in either of the first and second switching positions, a moment in one direction due to the intake negative pressure of the engine acts on the valve plate, and the valve plate is switched against the moment. Therefore, a large amount of power is required to hold the switch at a predetermined switching position.

  The present invention has been made in view of such circumstances, and while adopting a rotary valve plate, the power for switching the valve plate and holding it at a predetermined switching position is greatly reduced. Another object of the present invention is to provide an intake control apparatus for an engine that can reduce the valve plate switching angle as much as possible and has high responsiveness.

  To achieve the above object, the present invention provides an intake passage body attached to an engine, a first intake passage formed in the intake passage body and having a downstream end connected to an intake port of the engine, and the intake passage body. A second intake passage having a downstream end connected to the intake port, a valve shaft rotatably supported by the intake passage body, and a switching valve comprising a valve plate attached to the valve shaft. The valve plate closes the second intake passage by turning the valve shaft and connects the first intake passage to the intake port. The valve plate closes the first intake passage and In an intake control device for an engine which is rotated between a second switching position for conducting an intake passage to the intake port, first and second extending the valve plate from the valve shaft in opposite directions. Configured in a butterfly shape with half valve plate Thus, at the first switching position of the valve plate, a first valve plate half is formed from the valve shaft to form the first intake passage so as to form a part of the first intake passage by the first plate surface on one side of the valve plate. The second valve plate half is directed from the valve shaft to the upstream side of the first intake passage, and the second plate surface on the other side of the valve plate at the second switching position of the valve plate. The first valve plate half is directed from the valve shaft to the downstream side of the second intake passage, and the second valve plate half is formed from the valve shaft. The first intake plate body is in contact with the seal portion on the second plate surface side of the first valve plate half when the valve plate is in the first switching position. A second valve seat that is in contact with a seal portion on the first plate surface side of the second valve plate half when the valve plate is in the first switching position, and the valve plate is second switched. A third valve seat that is in contact with a seal portion on the first plate surface side of the first valve plate half, and when the valve plate is in the second switching position, the second valve plate half Forming a fourth valve seat with which the seal portion on the second plate surface side contacts, and at least one of the first valve plate half and the second valve plate half on the first plate surface side A first feature is that the seal portion on the second plate surface side is separated from each other in the thickness direction of the valve plate.

  According to the present invention, in addition to the first feature, a seal portion on the first plate surface side of the first valve plate half, a seal portion on the second plate surface side of the first valve plate half, the second The first plate surface side seal portion of the valve plate half portion and the second plate surface side seal portion of the second valve plate half portion are connected to the first plate surface peripheral portion of the first valve plate half portion, the first A first seal lip made of an elastic material, formed on the second plate surface peripheral portion of the valve plate half, the second valve plate half peripheral portion, and the second plate surface peripheral portion of the second valve plate half; The second feature is that each of the second seal lip, the third seal lip, and the fourth seal lip is configured.

  Furthermore, the present invention provides the first valve plate half or the second valve plate half in which both peripheral portions of the first plate surface and the second plate surface are separated from each other in addition to the first or second feature. According to a third aspect of the present invention, a tapered rectifying protrusion is formed on the tip portion far from the valve shaft at or near the inner surface of the corresponding intake passage at the first and second switching positions of the valve plate.

  Furthermore, in addition to any one of the first to third aspects, the present invention provides a peripheral portion serving as the seal portion of at least one of the first plate surface and the second plate surface on one side of the valve shaft. The fourth feature is that they are continuously connected to each other.

  The intake passage body corresponds to an intake manifold M in an embodiment of the present invention to be described later, the first intake passage corresponds to the long intake passage 4, and the second intake passage corresponds to the short intake passage 5. It is.

  According to the first feature of the present invention, when the valve plate is rotated to the first switching position, the seal portion on the second plate surface side of the first valve plate half contacts the first valve seat, When the seal portion on the first plate surface side of the second valve plate half part contacts the second valve seat, the second intake passage can be closed and the first intake passage can be conducted to the intake port. When the second switching position is turned, the seal portion on the first plate surface side of the first valve plate half contacts the third valve seat, and the seal portion on the second plate surface side of the second valve plate half By contacting the fourth valve seat, the first intake passage can be closed and the second intake passage can be conducted to the intake port. In any of these cases, the first valve plate half and the second valve plate half of the valve plate are disposed on the downstream side and the upstream side of the corresponding intake passage with the valve shaft as a boundary. The moment around the valve shaft acting on the first valve plate half due to the intake negative pressure of the engine and the moment around the valve shaft acting on the second valve plate half caused by the negative pressure cancel each other out in opposite directions. As a result, the moment acting on the valve shaft can be reduced to zero or greatly reduced. As a result, the holding force of the valve plate at each switching position and the driving torque when the valve plate is switched and rotated are sufficient.

  Moreover, since at least one of the first valve plate half and the second valve plate half is separated from the seal portion on the first plate surface side and the seal portion on the second plate surface side in the thickness direction of the valve plate, Therefore, the switching angle between the first and second switching positions of the valve plate can be made as small as possible, and the switching response can be improved.

  According to the second feature of the present invention, when the valve plate is rotated to the first switching position to close the second intake passage and to connect the first intake passage to the intake port, the first valve plate half portion The contact of the second seal lip with the first valve seat and the contact of the second valve plate half with the fourth seal lip with the second valve seat cause air flow from the second intake passage to the first intake passage. When the valve plate is pivoted to the second switching position to close the first intake passage and to connect the second intake passage to the intake port, it is possible to prevent leakage. Leakage of air from the first intake passage to the second intake passage by contact of the first seal lip with the third valve seat and contact of the fourth seal lip of the second valve plate half with the fourth valve seat. Can be surely prevented.

  According to the third aspect of the present invention, the first and second valve plate halves, which are spaced apart from each other, are tapered at the distal end side of the first valve plate half or the second valve plate half. Due to the presence of the rectifying protrusion, the disturbance of the intake air flow due to the thick tip of the valve plate can be prevented at any of the first and second switching positions of the valve plate, and the intake efficiency of the engine can be increased.

  According to the fourth aspect of the present invention, the peripheral portion of the first plate surface or the second plate surface that is continuous on one side of the valve shaft is brought into contact with the inner surface of the corresponding intake passage, thereby Air leakage from the surroundings can be prevented.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  FIG. 1 is a longitudinal side view showing an intake manifold equipped with an intake control device according to a first embodiment of the present invention in an attached state to an engine, and FIG. 2 shows a disassembled state of the intake manifold, corresponding to FIG. 3 is an exploded perspective view of the first and second blocks of the intake manifold, FIG. 4 is a perspective view of the third block of the intake manifold, and FIG. 5 is a switching valve (the first switching position state of the valve plate in FIG. 1). 6 is a sectional view taken along line 6-6 of FIG. 5, FIG. 7 is a sectional view taken along line 7-7 of FIG. 5, FIG. 8 is a sectional view taken along line 8-8 of FIG. Shows the second switching position of the valve plate, corresponding to FIG. 5, FIG. 10 is a sectional view taken along line 9-9 in FIG. 9, FIG. 11 is a sectional view taken along line 11-11 in FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 12, FIG. 14 is a cross-sectional view taken along line 14-14 of FIG. 13, and FIG. 15 is a third view of the intake manifold. FIG. 16 is a perspective view showing another modification of the third block of the intake manifold, FIG. 17 is a view corresponding to FIG. 5, showing a second embodiment of the present invention, and FIG. FIG. 19 is a diagram corresponding to FIG. 7 showing the third embodiment of the present invention, and FIG. 19 is a diagram corresponding to FIG. 18 showing the fourth embodiment of the present invention.

  First, in FIG. 1, a plurality of intake ports 2 are opened on a manifold mounting surface 1 formed in a cylinder head of a multi-cylinder (four cylinders in the illustrated example) engine E, and intake air is supplied to these intake ports 2. The intake manifold M to be distributed is fastened to the manifold mounting surface 1 by a plurality of bolts 6. In the following description, the front-rear direction of the intake manifold M refers to the front side on the opposite side of the engine E, the rear side refers to the engine E side, and the left-right direction refers to the arrangement direction of the plurality of intake ports 2.

  As shown in FIGS. 1 to 3, the intake manifold M is divided into at least two blocks: a first block M1 and a second block M2 joined to the upper surface of the first block M1 by a plurality of bolts 7. A single surge chamber 3 having an air inlet 3a (see FIG. 3) on one side in the left-right direction is formed on one side of the first block M1. Further, a plurality of long intake passages 4 that connect the surge chamber 3 to the plurality of intake ports 2 are formed from the first block M1 to the second block M2. That is, the upstream half 4a of the long intake passage 4 is integrally formed with the first block M1, and the downstream half 4b is integrally formed with the second block M2. The upstream half 4 a is curved and extends upward and forward in the surge chamber 3 while opening the funnel portion 4 a ′ that forms the upstream end portion in the lower portion of the surge chamber 3. Further, the downstream half part 4 b that extends to the upper side reaches the intake port 2 by bending upward and backward.

  4 to 7, the second block M2 is provided with a plurality of fitting holes 8 extending from the bottom surface of the downstream half 4b of the long intake passage 4 to the lower surface of the first block M1, and these fitting holes are provided. 8, a plurality of third blocks M3 are fitted, and peripheral portions of the third blocks M3 are fastened to the lower surface of the second block M2 by a plurality of bolts 9. The third block M3 is provided with a short intake path 5 having a flow path length shorter than that of the long intake path 4 that directly communicates the downstream end of the long intake path 4 with the surge chamber 3. The third block M3 includes a third block body 10 that is directly fastened to the second block M2, and a funnel member 11 that is coupled to the lower surface of the third block body 10 with bolts 12. The funnel member 11 constitutes the upstream end of the short intake passage 5 and opens downward in the upper portion of the surge chamber 3. The funnel member 11 is made of synthetic resin for the purpose of formability and weight reduction.

  The plurality of third block bodies 10 may be molded for each short intake passage 5 as shown in the illustrated example, or may be integrally molded for a plurality of sets (see FIG. 15), or all may be integrally molded. However, the number of attachment members such as bolts 9 can be reduced. In this case, the third block body 10 and the funnel member 11 can be integrally formed with each other.

  As shown in FIGS. 1 to 3, the rear wall of the surge chamber 3 is configured as a cover plate 13 that is detachably bolted to the first block M <b> 1 for convenience of molding the first block M <b> 1.

  In FIG. 5, the intake manifold M is provided with a switching valve V that selectively connects the long intake passage 4 and the short intake passage 5 to the intake port 2 in accordance with the operating conditions of the engine E. The valve V will be described with reference to FIGS. 5, 6 and 12 to 14.

  The switching valve V includes a common valve shaft 14 (see particularly FIG. 6) rotatably supported by the second block M2 so as to penetrate the plurality of long intake passages 4 in the left-right direction, the long intake passages 4 and The valve plate 15 includes a plurality of valve plates 15 attached to the valve shaft 14 corresponding to the short intake passage 5. The valve plate 15 closes the short intake passage 5 by the rotation of the valve shaft 14 and the long intake passage 4. Is switched to the intake port 2 and the second switching position B (see FIG. 9) is used to close the long intake passage 4 and connect the short intake passage 5 to the intake port 2. The actuator 24 attached to one side surface of the intake manifold M is connected to the outer end of the valve shaft 14, and the valve shaft 14 is driven to rotate by the actuator 24. Came to be There. The actuator 24 can be of any type, such as an electric type, an electromagnetic type, or a negative pressure type. A partition between adjacent long intake passages 4 in the second block M2 serves as a bearing portion of the valve shaft 14. A bearing member such as a ball bearing or a bush may be attached to the bearing portion.

  The valve plate 15 is configured in a butterfly shape by first and second valve plate halves 15a and 15b extending in opposite directions from the valve shaft 14, and the upper side at the first switching position A (see FIG. 5). In order to form a part of the lower surface of the downstream portion of the long intake passage 4 by the first plate surface F1, the first valve plate half 15a is directed from the valve shaft 14 to the downstream side of the long intake passage 4, and the second valve plate half The portion 15b is directed from the valve shaft 14 to the upstream side of the long intake passage 4, and at the second switching position B (see FIG. 9), a part of the upper surface of the downstream portion of the short intake passage 5 is provided by the lower second plate surface F2. The first valve plate half portion 15a is directed from the valve shaft 14 to the downstream side of the short intake passage 5, and the second valve plate half portion 15b is directed from the valve shaft 14 to the upstream side of the short intake passage 5. It has become.

  The third block M3 is provided with a notch 16 that receives the second valve plate half 15b of the valve plate 15 that rotates to the second switching position B.

  The valve plate 15 is curved so as to follow the curved bent shape of the long intake passage 4 and the short intake passage 5, so that intake resistance is not generated as much as possible. That is, the valve plate 15 is entirely curved with the first plate surface F1 as a convex side. At the first switching position A, the first plate surface F1 is substantially continuous with the inner surface of the long intake passage 4, At the second switching position B, the second plate surface F2 is substantially continuous with the inner surface of the short intake passage 5. The plate thickness of the valve plate 15 is such that the curvatures of the first plate surface F1 and the second plate surface F2 are different from each other, and the first valve plate half is from the distal end of the second valve plate half 15b far from the valve shaft 14. It gradually decreases toward the distal end of the portion 15a away from the valve shaft 14.

  The valve plate 15 covers a front surface and a back surface of a metal or hard synthetic resin core plate 18 fixed to the flat surface 14a on one side of the valve shaft 14 by a plurality of screws 17, and the core plate 18. The outer cover 19 made of an elastic material such as rubber is molded in this manner, and the outer cover 19 on the first plate surface F1 side is provided with a recess 20 for accommodating the valve shaft 14, and the second plate surface F2 side. The outer skin 19 is provided with a recess 21 for accommodating the head of the screw 17 so that the valve shaft 14 and the screw 17 and the like do not generate an intake resistance as much as possible.

  The first and second valve plate halves 15a and 15b of the valve plate 15 are formed in a substantially square shape in plan view according to the cross-sectional shapes of the long intake passage 4 and the short intake passage 5, respectively. The outer skin 19 includes a U-shaped first seal lip 22a that forms a peripheral edge of the first valve plate half 15a on the first plate surface F1 side, and a second plate surface F2 of the first valve plate half 15a. A U-shaped second seal lip 22b forming a side peripheral edge, a U-shaped third seal lip 22c forming a peripheral edge on the first plate surface F1 side of the second valve plate half 15b, and a second valve A U-shaped fourth seal lip 22d that forms the peripheral edge of the plate half portion 15b on the second plate surface F2 side is formed.

  The first and second seal lips 22a, 22b are completely separated from each other by the thickness because the second valve plate half 15b is thick toward the tip. The third and fourth seal lips 22c and 22d are fused with each other at the distal end of the second valve plate half 15b because the second valve portion 15b is thinner toward the distal end. 14, a common lateral lip 22 cd extending in the lateral direction parallel to 14 is formed. In other words, the third and fourth seal lips 22c and 22d share the lateral lip 22cd on the distal end side of the second valve plate half 15b. However, the third and fourth seal lips 22c and 22d may be made independent of each other in the same manner as the first and second seal lips 22a and 22b.

  Further, the second and fourth seal lips 22b and 22d are integrally connected to one side of the valve plate 15 so as to be continuous with each other, and corresponding long at the first and second switching positions A and B of the valve plate 15. It contacts the inner surface of the intake passage 4 and the short intake passage 5.

  2, 5, 7 and 8-11, on the other hand, when the valve plate 15 occupies the first switching position A in the intake manifold M, the first half of the first valve plate half 15a. When the valve plate 15 occupies the first switching position A, the third seal lip 22c of the second valve plate half 15b is seated when the valve plate 15 occupies the first switching position A. When the second valve seat 23b having a U shape in plan view and the valve plate 15 occupy the second switching position B, the second valve seat 23b has a U shape in plan view in which the second seal lip 22b of the first valve plate half 15a is seated. Similarly to the third valve seat 23c, when the valve plate 15 occupies the second switching position B, the fourth valve seat 23d having a U-shape in plan view in which the fourth seal lip 22d of the second valve plate half 15b is seated Is formed.

  Specifically, as shown in FIGS. 2, 5, 7 and 8, the first valve seat 23a on which the first seal lip 22a of the first valve plate half 15a is seated is formed in the third block M3. The second valve seat 23b on which the third seal lip 22c of the second valve plate half 15b is seated is formed from the second block M2 to the third block M3. That is, the U-shaped second valve seat 23b is formed by a pair of longitudinal seats 23b1 formed on the second block M2 so that both side portions of the third seal lip 22c are seated, and a side of the third seal lip 22c. The lateral seat 23b2 is formed on the third block M3 so that the directional lip 22cd is seated. The longitudinal seat 23b1 and the lateral seat 23b2 are in contact with the third seal lip 22c without breaks. Formed continuously.

  2 and 9 to 11, a third valve seat 23c on which the second seal lip 22b of the first valve plate half 15a is seated is formed in the second block M2, and the second valve plate half The fourth valve seat 23d on which the fourth seal lip 22d of 15b is seated is formed in the third block M3.

  The first to fourth valve seats 23a to 23d are formed as stepped portions projecting inward from the corresponding intake passages. However, part or all of the first to fourth valve seats 23a to 23d formed of the above-described stepped portions are connected to each intake passage 4, so that the cross section of each intake passage 4, 5 does not change discontinuously. 5 is tapered so that it continuously narrows in the direction of rotation of the valve plate 15, and the valve plate 15 is formed on the inner surface of each intake passage 4, 5 at the first switching position A or the second switching position B. If close contact is made, it is effective in reducing the channel resistance.

  As described above, forming the first to fourth valve seats 23a to 23d in the first to third blocks M1 to M3 is effective in facilitating the formation of these valve seats.

  As is clear from FIG. 5, a seal member 25 such as an O-ring surrounding the long intake passage 4 and the short intake passage 5 is interposed between the joint surfaces of the first and second blocks M1 and M2.

  Next, the operation of this embodiment will be described.

  When the engine E is operating at low speed, the valve shaft 14 of the switching valve V is rotated counterclockwise in FIG. 5 by the actuator 24 and the valve plate 15 is rotated to the first switching position A. In this state, the valve plate 15 has a first valve plate half portion so that a part of the lower surface of the downstream portion of the long intake passage 4 is formed by the first plate surfaces F1 of the first and second valve plate half portions 15a and 15b. 15a is directed from the valve shaft 14 to the downstream side of the long intake passage 4, and the second valve plate half portion 15b is directed from the valve shaft 14 to the upstream side of the long intake passage 4, thereby closing the short intake passage 5; Since the long intake passage 4 is electrically connected to the intake port 2, in the intake stroke of each cylinder of the engine E, when the air whose flow rate is controlled by a throttle body (not shown) flows into the surge chamber 3 from the air inlet 3a, the long intake passage 4 4 and the intake port 2 are supplied to the engine E through a relatively long pipe line. Therefore, the inside of the intake manifold M becomes a low-speed intake mode adapted to low-speed operation, and the charging efficiency can be improved by effectively using the intake inertia effect, and the low-speed output performance of the engine E can be improved.

  At this time, the intake negative pressure of the engine E acts on the first plate surface F1 of the valve plate 15 facing the long intake passage 4, but the valve plate 15 extends from the valve shaft 14 in opposite directions. And the second valve plate half 15a, 15b, the moment around the valve shaft 14 acting on the first valve plate half 15a due to the intake negative pressure and the second valve plate half 15b due to the intake negative pressure. The moments acting on the valve shaft 14 can be reduced to zero or greatly reduced by canceling each other in the opposite directions. As a result, the holding force of the valve plate 15 to the first switching position A and the driving torque for rotating the valve plate 15 from the first switching position A to the second switching position B are sufficient.

  Further, at the first switching position A of the valve plate 15, the first curved plate surface F 1 of the valve plate 15 continues to the convexly curved lower surface of the long intake passage 4 and the valve shaft 14 is large. By immersing the portion below the first plate surface F1, an increase in flow resistance of the long intake passage 4 by the switching valve V can be prevented, and an intake inertia effect can be effectively obtained.

  Further, at the first switching position A of the valve plate 15, the first seal lip 22a of the first valve plate half 15a is seated on the first valve seat 23a of the third block M3, and the second valve plate half 15b Since the third seal lip 22c is seated on the second valve seat 23b of the second and third blocks M2, M3, it is possible to reliably prevent air leakage from the short intake passage 5 to the long intake passage 4 side, This is also extremely effective in obtaining an effective intake inertia effect.

  During high speed operation of the engine E, the valve shaft 14 of the switching valve V is rotated clockwise in FIG. 9 by the actuator 24 to switch the valve plate 15 to the second switching position B. In this state, the valve plate 15 has the first valve plate half portion 15a formed so as to form a part of the upper surface of the short intake passage 5 by the second plate surface F2 of the first and second valve plate half portions 15a and 15b. The long intake passage 4 is closed and the short intake air is directed from the valve shaft 14 to the downstream side of the short intake passage 5 and by directing the second valve plate half portion 15b from the valve shaft 14 to the upstream side of the short intake passage 5. Since the passage 5 is electrically connected to the intake port 2, in the intake stroke of each cylinder of the engine E, when air whose flow rate is controlled by a throttle body (not shown) flows into the surge chamber 3 from the air inlet 3a, the short intake passage 5 and The engine E is supplied to the engine E through a relatively short pipe line composed of the intake port 2. Accordingly, the inside of the intake manifold M becomes a high-speed intake mode adapted to high-speed operation, and the charging efficiency is increased by reducing the intake resistance and the use of the pulsation effect of the intake, and the high-speed output performance of the engine E can be improved.

  At that time, the intake negative pressure of the engine E acts on the second plate surfaces F2 of the first and second valve plate halves 15a and 15b of the valve plate 15 facing the long intake passage 4. The moment around the valve shaft 14 acting on the first valve plate half 15a due to the intake negative pressure is opposite to the moment around the valve shaft 14 acting on the second valve plate half 15b due to the intake negative pressure. By canceling each other, the moment acting on the valve shaft 14 can be reduced to zero or greatly reduced. As a result, the holding force of the valve plate 15 to the second switching position B and the driving torque for rotating the valve plate 15 from the second switching position B to the first switching position A are sufficient. In this way, it is possible to reduce the output of the actuator 24 that rotationally drives the valve shaft 14 and to reduce its size.

  Further, at the second switching position B of the valve plate 15, the second plate surface F 2 curved in a concave shape of the valve plate 15 is continuous with the concave curved upper surface of the short intake passage, and the valve plate 15 is attached to the valve shaft 14. Since the head of the screw 14 to be fixed is immersed under the second plate surface F2, an increase in the flow resistance of the short intake passage 5 due to the switching valve V can be prevented.

  Further, at the second switching position B of the valve plate 15, the second seal lip 22b of the first valve plate half 15a is seated on the third valve seat 23c of the second block M2, and the second valve plate half 15b Since the fourth seal lip 22d is seated on the fourth valve seat 23d of the third block M3, air leakage from the long intake passage 4 to the short intake passage 5 can be surely prevented, which is also effective pulsation. It is extremely effective in obtaining the effect.

  The second and fourth seal lips 22b and 22d of the valve plate 15 are connected to one side of the valve shaft 14 so as to be continuous with each other, and the second and fourth seal lips 22b and 22d are connected to the first and second seal lips. The air contact between the long intake passage 4 and the short intake passage 5 around the valve shaft 14 is prevented by contacting the corresponding inner surfaces of the long intake passage 4 and the short intake passage 5 at the two switching positions A and B. be able to.

  Further, in the first valve plate half portion 15a, the plate thickness is increased, and the first and second seal lips 22a, 22b of the first and second plate surfaces F1, F2 are separated from each other. Therefore, the switching angle between the first and second switching positions A and B of the valve plate 15 can be made as small as possible, and the switching response can be improved.

  Incidentally, the intake manifold M is divided into at least two blocks, a first block M1 and a second block M2, which are joined to each other. The surge block 3 and the upstream half 4a of the long intake passage 4 are divided into the first block M1. Is formed integrally with the second block M2 and the downstream half 4b of the long intake passage 4 is formed integrally therewith and the valve shaft 14 of the switching valve V is attached to the second block M2. A third block M3 having a short intake passage 5 having an end portion opened to the surge chamber 3 and a downstream end portion opened to the downstream half portion 4b of the long intake passage 4 is continuously provided. Since the downstream end of the short intake passage 5 is closed when in the first switching position A, and the downstream half 4b of the long intake passage 4 is closed when it is in the second switching position B, the first and first 2 and The three blocks M1, M2, M3, may be composed of a material in accordance with the function. For example, since the first block M1 has a large volume surge chamber 3 and a relatively long long intake passage 4 upstream half 4a, it is required to be particularly lightweight, so that the first block M1 is made of synthetic resin. Since the two blocks M2 are close to the engine E and particularly require heat resistance, and support the valve shaft 14 and have the second and third valve seats 23b and 23c, wear resistance is required. This is made of light alloy casting, and since the third block M3 has the first and fourth valve seats 23a, 23d, wear resistance is required, so this is made of light alloy casting.

  Next, a second embodiment of the present invention shown in FIG. 17 will be described.

  In the second embodiment, the valve plate 15 is formed of a synthetic resin having a sealing property on the whole or the outer skin thereof, and the first to fourth seal lips as in the previous embodiment are eliminated. However, in this case, the peripheral portions of the first and second plate surfaces F1 and F2 of the valve plate 15 seated on the first to fourth valve seats 23a to 23e serve as seal portions. Further, the first and second switching positions A and B of the valve plate 15 correspond to the front end portion of the first valve plate half portion 15a where both peripheral portions of the first plate surface F1 and the second plate surface F2 are separated from each other. A tapered rectifying protrusion 27 that is in contact with or close to the inner surface of the intake passage is integrally formed. Since other configurations are the same as those of the valve plate 15 of the previous embodiment, the same reference numerals are given to the portions corresponding to those of the valve plate 15 of the previous embodiment in FIG. To do.

  According to the second embodiment, the first and second valve plate halves 15a and 15b of the first and second plate surfaces F1 and F2 of the valve plate 15 are separated from each other. On the tip side, the presence of the tapered rectifying projection 27 prevents the disturbance of the intake air flow caused by the thick tip of the valve plate 15 at any of the first and second switching positions of the valve plate 15, and the engine E The intake efficiency can be increased. Of course, the rectifying protrusion 27 can also be used in the valve plate 15 with the seal lip in the previous embodiment.

  Next, a third embodiment of the present invention shown in FIG. 18 will be described.

  In the third embodiment, the entire third block M3 is integrally formed, and the third block M3 is coupled to the first block M1 side by a bolt 9, and the head of the bolt 9 is the bottom surface of the second block M2. Except for the point accommodated in the counterbore 26, the configuration is substantially the same as that of the first embodiment. Therefore, in FIG. 18, parts corresponding to those of the first embodiment are denoted by the same reference numerals. , Redundant description is omitted.

  According to the third embodiment, the bolt 9 can be prevented from falling off due to the loosening by the counterbore 26 on the lower surface of the second block M2.

  Finally, a fourth embodiment of the present invention shown in FIG. 19 will be described.

  In the fourth embodiment, the third block M3 is coupled to the second block M2 side by a bolt 9, and the head of the bolt 9 is accommodated in a counterbore 26 on the upper surface of the first block M1. Since the configuration is substantially the same as that of the third embodiment, the same reference numerals are given to the portions corresponding to those of the first embodiment in FIG. According to the fourth embodiment, the same effects as in the third embodiment can be obtained.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the first, second, and third blocks M1, M2, and M3 can be stacked in three layers, and the long intake passage 4 can be formed over the first, second, and third blocks M1, M2, and M3. Of course, the intake control device of the present invention can be applied to a multi-cylinder engine other than the four-cylinder engine and a single-cylinder engine.

1 is a longitudinal side view showing an intake manifold equipped with an intake control device of the present invention in a state where it is attached to an engine. The corresponding figure with FIG. 1 which shows the decomposition | disassembly state of the same intake manifold. The disassembled perspective view of the 1st and 2nd block of the same intake manifold. The perspective view of the 3rd block of the same intake manifold. FIG. 2 is an enlarged view around the switching valve of FIG. 1 (showing a first switching position state of the valve plate). FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 5. FIG. 6 is a view corresponding to FIG. 5 showing a second switching position of the valve plate. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 9. FIG. 11 is a sectional view taken along line 11-11 in FIG. 9; The perspective view of a valve plate. FIG. 13 is a sectional view taken along line 13-13 of FIG. FIG. 14 is a sectional view taken along line 14-14 of FIG. The perspective view which shows the deformation | transformation of the 3rd block of an intake manifold. The perspective view which shows the other deformation | transformation of the 3rd block of an intake manifold. FIG. 6 is a view corresponding to FIG. 5 showing a second embodiment of the present invention. FIG. 8 is a view corresponding to FIG. 7 showing a third embodiment of the present invention. FIG. 19 is a view corresponding to FIG. 18 showing a fourth embodiment of the present invention.

Explanation of symbols

A ... Valve plate first switching position B ... Valve plate second switching position E ... Engine F1 ... Valve plate first plate surface F1 ... Second plate surface M of valve plate ... Intake passage body (intake manifold)
V ... Switching valve 2 ... Intake port 4 ... First intake path (long intake path)
5 ... 2nd intake path (short intake path)
14 .... Valve shaft 15 ... Valve plate 15a ... First valve plate half 15b ... Second valve plate half 22a-22d ... First to fourth seal lips 23a- 23d ··· First to fourth valve seats 27 ··· Rectification protrusion

Claims (4)

An intake passage body (M) attached to the engine (E), and a first intake passage (4) formed in the intake passage body (M) and having a downstream end connected to the intake port (2) of the engine (E) A second intake passage (5) formed in the intake passage body (M) and having a downstream end connected to the intake port (2), and a valve shaft rotatably supported by the intake passage body (M) 14) and a switching valve (V) comprising a valve plate (15) attached to the valve shaft (14), and the valve plate (15) is rotated by the rotation of the valve shaft (14). A first switching position (A) for closing the second intake passage (5) and conducting the first intake passage (4) to the intake port (2), and closing the first intake passage (4) and the second intake passage (4). 2 is rotated between the second switching position (B) for connecting the intake passage (5) to the intake port (2). In the intake control device of Gin,
The valve plate (15) is configured in a butterfly shape with first and second valve plate halves (15a, 15b) extending in opposite directions from the valve shaft (14). In the first switching position (A), the first valve plate half (15a) is formed to form a part of the first intake passage (4) by the first plate surface (F1) on one side of the valve plate (15). Toward the downstream side of the first intake passage (4) from the valve shaft (14) and the second valve plate half (15b) from the valve shaft (14) to the upstream side of the first intake passage (4). In the second switching position (B) of the valve plate (15), a part of the second intake passage (5) is moved by the second plate surface (F2) on the other side of the valve plate (15). In order to form, the first valve plate half (15a) is directed from the valve shaft (14) to the downstream side of the second intake passage (5) and the second valve plate half (15b) is directed to the valve shaft ( 1 ) Toward the upstream side of the second intake passage (5), and the intake passage body (M) has the first valve plate when the valve plate (15) is in the first switching position (A). The first valve seat (23a) with which the seal portion on the second plate surface (F2) side of the half portion (15a) comes into contact, and when the valve plate (15) is in the first switching position (A), When the second valve seat (23b) with which the seal part on the first plate surface (F1) side of the two valve plate halves (15b) contacts and the valve plate (15) are in the second switching position (B) Similarly to the third valve seat (23c) with which the seal portion on the first plate surface (F1) side of the first valve plate half (15a) contacts, the valve plate (15) is in the second switching position (B). The second valve plate half (15b) forms a fourth valve seat (23d) with which the seal portion on the second plate surface (F2) side comes into contact with the second valve plate half (15b). At least one of (15a) and the second valve plate half (15b), the valve plate (15) includes a seal portion on the first plate surface (F1) side and a seal portion on the second plate surface (F2) side. Engine intake control device characterized by being spaced apart from each other in the thickness direction of the engine. The intake control apparatus for an engine according to claim 1,
A seal part on the first plate surface (F1) side of the first valve plate half part (15a), a seal part on the second plate surface (F2) side of the first valve plate half part (15a), the second valve The seal part on the first plate surface (F1) side of the plate half part (15b) and the seal part on the second plate surface (F2) side of the second valve plate half part (15b) are connected to the first valve plate half part. The first plate surface (F1) peripheral portion of (15a), the second plate surface (F2) peripheral portion of the first valve plate half (15a), the second valve plate half (15b) peripheral portion and the first A first seal lip (22a), a second seal lip (22b), and a third seal lip (22c) made of an elastic material, which are formed on the periphery of the second plate surface (F2) of the two valve plate halves (15b). And a fourth seal lip (22d), respectively. The intake control apparatus for an engine according to claim 1 or 2,
The valve stem of the first valve plate half (15a) or the second valve plate half (15b) in which both seal portions on the first plate surface (F1) and second plate surface (F2) sides are separated from each other. (14) A tapered rectifying protrusion (27) which is in contact with or close to the inner surface of the corresponding intake passage at the first and second switching positions (A, B) of the valve plate (15) is provided at the distal end portion. An intake control device for an engine characterized by being formed. The intake control apparatus for an engine according to any one of claims 1 to 3,
The peripheral edge part which becomes the said seal part of the said 1st board surface (F1) and the 2nd board surface (F2) was connected so that it might mutually continue in one side of the said valve shaft (14). A feature of the engine intake control system.

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