JP2011064138A - Engine intake control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine intake control device greatly reducing power for changing over a valve plate and retaining the same at a prescribed change over position. <P>SOLUTION: The valve plate 11 is composed in a butterfly shape by a first and a second valve plate half part 11a, 11b extending in an opposite direction from a valve shaft 10. The first valve plate half part 11a is set toward a downstream side of a first intake passage 2 and the second valve plate half part 11b is set toward an upstream side of the first intake passage 2 at a first change over position A of the valve plate 11. The first valve plate half part 11a is set toward a downstream side of a second intake passage 3 and the second valve plate half part 11b is set toward an upstream side of the second intake passage 3 at a second change over position B of the valve plate 11. A seal member 14 is installed on an outer circumference of the valve plate 11. A first and a second valve seat 15, 16 with which a seal member 14 comes in close contact at the first and the second change over position A, B of the valve plate 11, and guide parts 18, 19 guiding movement of the seal member 14 accompanying rotation of the valve plate 11 are formed on an intake passage body M. <P>COPYRIGHT: (C)2011,JPO&INPIT

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, and formed in the intake passage body. A switching valve comprising a second intake passage having a flow path length shorter than that of the first intake passage, a valve shaft rotatably supported by the intake passage body, and a valve plate attached to the valve shaft. And the valve plate closes the second intake passage by turning the valve shaft and connects the first intake passage to the intake port, and the first intake passage. And an intake control device for an engine that is rotated between a second switching position for connecting the second intake passage to the intake port.

  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. An object of the present invention is to provide an intake control device for the engine.

  In order 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 also formed in the intake passage body. A second intake passage having a flow path length shorter than that of the first intake passage, a valve shaft rotatably supported by the intake passage body, and a valve plate attached to the valve shaft. A switching valve, wherein the valve plate closes the second intake passage by turning the valve shaft and connects the first intake passage to the intake port; In an intake control device for an engine, which is rotated between a second switching position for closing the first intake passage and connecting the second intake passage to the intake port, the valve plates are connected to each other from the valve shaft. Extend in the opposite direction The first and second valve plate halves constitute a butterfly type, and at the first switching position of the valve plate, a first valve plate is formed so as to form a part of the first intake passage by a plate surface on one side of the valve plate. The half is directed from the valve shaft to the downstream side of the first intake passage, the second valve plate half is directed from the valve shaft to the upstream side of the first intake passage, and the second switching position of the valve plate is set. Then, in order to form a part of the second intake passage by the plate surface on the other side 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 A plate half is directed from the valve shaft to the upstream side of the second intake passage, and a seal member is attached to the outer periphery of the valve plate, while the intake passage body has first and second valve plates. The first and second valve seats that keep the seal member in close contact with each other at the two switching positions and keep the airtight around the valve plate are connected to each other, In that the formed guide portion for guiding the movement in said first and second valve seats of the sealing member and the first feature. The intake passage body corresponds to an intake manifold M in an embodiment of the present invention to be described later, and the first and second intake passages correspond to long and short intake passages 2 and 3, respectively.

  According to the present invention, in addition to the first feature, a guide portion for guiding the movement of the seal member on the first valve plate half portion side of the guide portion is provided downstream of the first and second intake passages. A second feature is that the guide bone is arranged so as to cross the side.

  In addition to the first feature, the present invention further includes forming an annular seal groove passing through one side of the valve shaft on the outer periphery of the valve plate, and forming the seal member in an annular shape to form the seal groove. The third feature is that it is mounted.

  Furthermore, in addition to the third feature, the present invention has a fourth feature in that a flat surface is formed in the fitting portion of the valve shaft and the valve plate, and the flat surface and the seal groove are disposed adjacent to each other. .

  According to the first aspect of the present invention, the valve plate is configured in a butterfly shape by the first and second valve plate halves extending in opposite directions from the valve shaft, and the first switching position of the valve plate is formed. Then, in order to form a part of the first intake passage by a plate surface on one side of the valve plate, the first valve plate half is directed from the valve shaft to the downstream side of the first intake passage, and the second valve plate half is In order to form a part of the second intake passage from the valve shaft toward the upstream side of the first intake passage and at the second switching position of the valve plate, a part of the second intake passage is formed by the plate surface on the other side of the valve plate. Since the half portion is directed from the valve shaft to the downstream side of the second intake passage and the second valve plate half portion is directed from the valve shaft to the upstream side of the second intake passage, the valve plate is moved to the first switching position. Even when only the first intake passage is connected to the intake port by rotating to the second switching position, both the first intake passage and the first intake passage are connected to the intake port. The plate half and the second valve plate half are arranged on the downstream side and the upstream side of the corresponding intake passage with the valve shaft as a boundary. Therefore, the first half of the valve plate is caused by the intake negative pressure of the engine. The moment around the valve stem and the moment around the valve stem acting on the second valve plate half due to the same negative pressure cancel each other out in the opposite direction. Can be 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.

  In addition, a seal member is mounted on the outer periphery of the valve plate, while the seal member is in close contact with the intake passage body at the first and second switching positions of the valve plate to maintain airtightness around the valve plate. And the second valve seat, and the first and second valve seats are connected to each other, and the seal member moves between the first and second valve seats when the valve plate rotates between the first and second switching positions. When the valve plate is switched to the first and second switching positions, the sealing member is seated with the first and second valve seats by being guided by the first and second guiding portions. In addition to being able to carry smoothly, the air tightness around the valve plate can be maintained to prevent intake air leakage between the long intake passage and the short intake passage, and to avoid a reduction in intake inertia effect due to the leak.

  According to the second feature of the present invention, of the guide portions, the guide portion for guiding the movement of the seal member on the first valve plate half portion side crosses the downstream side of the first and second intake passages. Since the guide bone is configured as described above, this guide bone prevents the seal member on the first valve plate half side exposed at the downstream side of the first and second intake passages when the valve plate rotates. While preventing, it can guide | invade smoothly to the seating position with the 1st, 2nd valve seat of the seal member. In addition, since this guide bone is sufficient as a thin guide bone, the guide bone is arranged in the intake passage, but hardly causes the intake resistance.

  According to the third feature of the present invention, an annular seal groove that passes through one side of the valve shaft is formed on the outer periphery of the valve plate, and the seal member is configured in an annular shape and mounted in the seal groove. It is possible to use a single annular sealing member without being obstructed by the valve, and it is possible to reliably seal the entire outer periphery of the valve plate without being obstructed by the valve shaft.

  According to the fourth feature of the present invention, in addition to the third feature, a flat surface is formed in the fitting portion of the valve shaft and the valve plate, and the flat surface and the seal groove are disposed adjacent to each other. And the center of the valve shaft can be sufficiently narrowed, which can contribute to the compactness of the valve plate.

The perspective view of an intake manifold provided with the intake control device concerning the example of the present invention. FIG. 2 is a cross-sectional perspective view taken along line 2-2 of FIG. 1 and shows the state of the first switching position of the valve plate (the conduction state of the long intake passage). FIG. 3 is a view corresponding to FIG. 2 showing a state of the second switching position of the valve plate (conduction state of the short intake passage). The principal part enlarged view of FIG. The principal part enlarged view of FIG. The corresponding figure with FIG.4 and FIG.5 which removes a valve body and shows a 1st and 2nd valve seat. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 2.

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

  First, in FIGS. 1 and 2, the symbol M indicates an intake manifold attached to a multi-cylinder engine, for example, a four-cylinder engine. The intake manifold M includes a single surge chamber 1 that extends long in the cylinder arrangement direction of the engine, and a plurality of portions that extend from the lower side of the surge chamber 1 and extend above the surge chamber 1 to extend the downstream end substantially horizontally. A plurality of (four in the drawing) long intake passages 2 and a plurality of (four in the illustrated example) short intake passages 3 extending so as to connect the lower portion of the surge chamber 1 to the downstream portion of the long intake passage 2; , And a common intake passage 4 extending along the axis of each long intake passage 2 from the intersection of the long intake passage 2 and the short intake passage 3. A single air introduction path 6 extends from one side in the longitudinal direction of the surge chamber 1, and a throttle mounting flange 7 for mounting a throttle body (not shown) is formed at the upstream end thereof. Therefore, the air introduction path 6 is connected to the intake passage of the throttle body.

  A joint flange 8 is formed at the downstream ends of the plurality of common intake passages 4 so that they are integrally connected to each other. The joint flange 8 is bolted to a manifold mounting surface of an engine (not shown) where a plurality of intake ports are opened. It comes to be joined. Accordingly, the common intake passage 4 is connected to the intake port of the engine. In other words, the long intake passage 2 and the short intake passage 3 are both connected to the intake port at the downstream end.

  The intake manifold M is provided with a switching valve V that selectively connects the long intake passage 2 and the short intake passage 3 to the common intake passage 4, that is, the intake port of the engine, according to the operating conditions of the engine E. Next, the switching valve V will be described with reference to FIGS.

  The switching valve V includes a common valve shaft 10 that is rotatably supported by the intake manifold M so as to pass through the downstream ends of the plurality of short intake passages 3 in the arrangement direction of the plurality of short intake passages 3, and the valve The valve plate 11 includes a plurality of valve plates 11 attached to the shaft 10. The valve plate 11 closes the short intake passage 3 by turning the valve shaft 10 and makes the long intake passage 2 conductive to the common intake passage 4. Between the switching position A (see FIGS. 2 and 4) and the second switching position B (see FIGS. 3 and 5) that closes the long intake passage 2 and connects the short intake passage 3 to the common intake passage 4. An actuator (not shown) such as an electric motor that can drive the valve shaft 10 is connected to the outer end of the valve shaft 10.

  The valve plate 11 is configured in a butterfly shape by first and second valve plate halves 11a and 11b extending in opposite directions from the valve shaft 10, and one plate surface thereof is a first plate surface F1, the other. Is called the second plate surface F2. Thus, in the first switching position A, the valve plate 11 extends the first valve plate half portion 11a from the valve shaft 10 so as to form one side wall of the downstream portion of the long intake passage 2 by the first plate surface F1. The second valve plate half 11b is directed from the valve shaft 10 to the upstream side of the long intake passage 2 while being directed to the downstream side of the intake passage 2, and at the second switching position B, the short intake passage 3 is formed by the second plate surface F2. In order to form one side wall, the first valve plate half 11a is directed from the valve shaft 10 to the downstream side of the short intake passage 3, and the second valve plate half 11b is directed from the valve shaft 10 to the upstream side of the short intake passage 3. It comes to turn to.

  The valve plate 11 has an oval shape whose minor axis is the axial direction of the valve shaft 10, and an annular seal groove 13 that passes through one side of the valve shaft 10 is formed on the outer peripheral surface thereof. An annular seal member 14, an O-ring in the illustrated example, is attached to 13. The fitting portion between the valve shaft 10 and the valve plate 11 is provided with a flat surface 10a that ensures the integral rotation of the valve shaft 10 and the valve plate 11 toward the seal groove 13 side, and the flat surface 10a and the seal groove 13 are mutually connected. Adjacent to each other.

  On the other hand, the intake manifold M has annular first and second valve seats 15 that keep the seal member 14 in close contact with each other at the first and second switching positions A and B of the valve plate 11 and keep the airtight around the valve plate 11. 16 (see FIG. 6) and the first and second valve seats 15 and 16 are connected to each other, and when the valve plate 11 is rotated, the first and second seal members 14 on the first valve plate half portion 11a side are connected. The first guide portion 18 for guiding the movement between the two valve seats 15 and 16, and the first and second valve seats 15 of the seal member 14 on the second valve plate half 11b side when the valve plate 11 is rotated. , 16 is formed with a second guide part 19 for guiding the movement between them.

  Specifically, as clearly shown in FIGS. 2 and 7, the first guide portion 18 is provided on the downstream side of the long and short intake passages 2 and 3 so as to connect the opposing inner walls of the long intake passage 2. That is, it is composed of one or a plurality of guide bones 18 crossing the common intake passage 4. The second guide portion 19 is constituted by a guide wall 19 that is curved so as to continuously connect the first and second valve seats 15 and 16.

  The valve plate 11 is formed such that the first valve plate half 11a is thick and the second valve plate half 11b is thin, and the first plate surface F1 is at the first switching position A of the valve plate 11. A smooth surface is formed so as to be continuous with the inner wall surface of the long intake passage 2. A step portion 21 is formed in the middle of the second plate surface F2, and the inner corner 21a and the outer corner 21b of the step portion 21 are rounded. When the valve plate 11 occupies the second switching position B, the step portion 21 can exhibit a funnel function that smoothly guides air flowing from the surge chamber 1 to the short intake passage 3.

  In FIG. 6, reference numeral 23 denotes a bearing hole of the valve shaft 10 provided in the intake manifold M.

  Next, the operation of this embodiment will be described.

  During low speed operation of the engine E, the valve plate 11 is rotated and held at the first switching position A shown in FIGS. 2 and 4 through the valve shaft 10 by the operation of an actuator (not shown). In this state, the valve plate 11 has a first valve plate half portion so that a part of the lower surface of the downstream portion of the long intake passage 2 is formed by the first plate surfaces F1 of the first and second valve plate half portions 11a and 11b. 11a is directed from the valve shaft 10 to the downstream side of the long intake passage 2, that is, the common intake passage 4 side, and the second valve plate half portion 11b is directed from the valve shaft 10 to the upstream side of the long intake passage 2, thereby While closing the passage 3 and connecting the long intake passage 2 to the common intake passage 4 connected to the intake port of the engine, in the intake stroke of each cylinder of the engine E, the air whose flow rate is controlled by a throttle body (not shown) When the air flows into the surge chamber 1 from the air inlet 3a, it is supplied to the engine E through a relatively long pipe line composed of the long intake path 2, the common intake path 4 and the intake port. 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, intake negative pressure of the engine E acts on the first plate surface F1 of the valve plate 11 facing the long intake passage 2, but the valve plate 11 extends from the valve shaft 10 in opposite directions to each other. And the second valve plate half 11a and 11b, the moment around the valve shaft 10 acting on the first valve plate half 11a by the intake negative pressure and the second valve plate half 11b by the intake negative pressure. The moment acting on the valve shaft 10 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 11 to the first switching position A and the driving torque for rotating the valve plate 11 from the first switching position A to the second switching position B are sufficient.

  During high-speed operation of the engine E, the valve plate 11 is rotated and held at the second switching position A shown in FIGS. 3 and 5 through the valve shaft 10 by the operation of the actuator. In this state, the valve plate 11 moves the first valve plate half 11a to the valve shaft so as to form a part of the short intake passage 3 by the second plate surface F2 of the first and second valve plate half 11a, 11b. 10 is directed to the downstream side of the short intake passage 3, that is, toward the common intake passage 4, and the second valve plate half portion 11 b is directed from the valve shaft 10 toward the surge chamber 1, thereby closing the long intake passage 2 and shorting. Since the intake passage 3 is electrically connected to the common intake passage 4, 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 1 from the air inlet 3a, the short intake passage 3. The engine E is supplied through a relatively short pipe line including the common intake passage 4 and the intake port. 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 11a and 11b of the valve plate 11 facing the long intake passage 2. The direction around the moment around the valve shaft 10 acting on the first valve plate half 11a due to the intake negative pressure is opposite to the moment around the valve shaft 10 acting on the second valve plate half 11b due to the intake negative pressure. By canceling each other, the moment acting on the valve shaft 10 can be reduced to zero or greatly reduced. As a result, the holding force of the valve plate 11 to the second switching position B and the driving torque for rotating the valve plate 11 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 that rotationally drives the valve shaft 10 and to reduce its size.

  In addition, a seal member 14 is mounted on the outer periphery of the valve plate 11, and the seal member 14 is in close contact with the intake manifold M at the first and second switching positions A and B of the valve plate 11 and around the valve plate 11. The annular first and second valve seats 15 and 16 that maintain airtightness, and the first and second valve seats 15 and 16 are connected to each other, and the seal member 14 is connected between the first and second valve seats 15 and 16. Since the first and second guide portions 18 and 19 for guiding the movement are formed, the first and second guide portions 18 and 19 are used when the valve plate 11 is switched to the first and second switching positions A and B. By guiding, the seal member 14 can be smoothly transported to the seating position with the first and second valve seats 15 and 16, and the airtightness around the valve plate 11 is maintained, whereby the long intake passage 2 and the short intake passage are maintained. Intake air leakage between the intake passages 3 is prevented, and the intake inertia effect due to the leak is low. It can be avoided.

  In particular, the first guide portion 18 that guides the movement of the seal member 14 on the first valve plate half portion 11a side is constituted by the guide bone 18 that is arranged so as to cross the common intake passage 4, so that this guide is provided. The bone 18 prevents the seal member 14 on the first valve plate half 11a side exposed to the common intake passage 4 from being detached when the valve plate 11 is rotated, and the first and second valve seats of the seal member 14 are provided. 15 and 16 can be smoothly guided to the seating position. In addition, since the guide bone 18 is thin, it is sufficient that it is disposed in the common intake passage 4 and hardly causes the intake resistance.

  Further, the seal member 14 is formed in an annular shape, and is mounted in an annular seal groove 13 passing through one side of the valve shaft 10 on the outer periphery of the valve plate 11, so that the valve shaft 10 is not obstructed. One annular seal member 14 can be used, and the entire outer periphery of the valve plate 11 can be reliably sealed without being obstructed by the valve shaft 10.

  Further, since the annular seal groove 13 is disposed adjacent to the flat surface 10a formed in the fitting portion of the valve shaft 10 and the valve plate 11, the interval between the seal groove 13 and the center of the valve shaft 10 can be sufficiently narrowed. The valve plate 11 can be made compact.

  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 common intake passage 4 can be replaced with an intake port of the engine. Of course, the present invention can be applied to a multi-cylinder engine other than the four-cylinder engine and a single-cylinder engine.

A ... Valve plate first switching position B ... Valve plate second switching position F1 ... Plate surface on one side of valve plate (first plate surface)
F2 ... the plate surface on the other side of the valve plate (first plate surface)
M: Intake channel body (intake manifold)
V ... Switching valve 1 ... Surge chamber 2 ... Long intake passage 3 ... Short intake passage 10 ... Valve shaft 10a ... Flat surface 11 ... ··· valve plate 11a ··· first valve plate half 11b ··· second valve plate half 13 ··· seal groove 14 ··· seal member 15 ··· first valve seat 16 ··· ..Second valve seats 18, 19 ... guide part (guide bone, guide wall)

Claims (4)

An intake passage body (M) attached to the engine (E), a first intake passage (2) formed in the intake passage body (M) and having a downstream end connected to an intake port of the engine, and an intake passage body (M ), The downstream end is connected to the intake port, the flow path length is shorter than the first intake path (2), and the second intake path (3) is rotatably supported by the intake path body (M). And a switching valve (V) composed of a valve plate (11) attached to the valve shaft (10). The valve plate (11) is connected to the valve shaft (10). , The second intake passage (3) is closed and the first intake passage (2) is connected to the intake port, and the first intake passage (2) is closed. And a second switching position (B) for conducting the second intake passage (3) to the intake port; Between is rotated, the intake control device for an engine,
The valve plate (11) is configured as a butterfly type by first and second valve plate halves (11a, 11b) extending in opposite directions from the valve shaft (10). In the first switching position (A), the first valve plate half (11a) is formed by the plate surface (F1) on one side of the valve plate (11) to form a part of the first intake passage (4). The valve shaft (10) is directed to the downstream side of the first intake passage (2), and the second valve plate half (11b) is directed from the valve shaft (10) to the upstream side of the first intake passage (2). In order to form a part of the second intake passage (3) by the plate surface (F2) on the other side of the valve plate (11) at the second switching position (B) of the valve plate (11). The first valve plate half (11a) is directed from the valve shaft (10) to the downstream side of the second intake passage (3), and the second valve plate half (11b) is directed to the valve shaft (10). And a seal member (14) is mounted on the outer periphery of the valve plate (11), while the valve plate is attached to the intake passage body (M). The first and second valve seats (15, 16) in which the seal member (14) is in close contact with each other at the first and second switching positions (A, B) of (11) and keeps airtight around the valve plate (11). And a guide part for connecting the first and second valve seats (15, 16) to guide the movement of the seal member (14) between the first and second valve seats (15, 16). (18, 19) and an intake control device for an engine. The intake control apparatus for an engine according to claim 1,
Of the guide portions (18, 19), a guide portion that guides the movement of the seal member (14) on the first valve plate half (11a) side, which is the first and second intake passages (2, 3). An intake control device for an engine, characterized by comprising a guide bone (18) arranged so as to cross the downstream side. The intake control apparatus for an engine according to claim 1,
An annular seal groove (13) passing through one side of the valve shaft (11) is formed on the outer periphery of the valve plate (11), and the seal member (14) is formed in an annular shape to form the seal groove (13 The intake control device for the engine, The intake control apparatus for an engine according to claim 3,
A flat surface (11a) is formed in a fitting portion between the valve shaft (11) and the valve plate (11), and the flat surface (11a) and the seal groove (13) are disposed adjacent to each other. Engine intake control device.

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