JP2004003424A - Intake device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for an engine provided with an intake cushion valve capable of increasing an output of the engine and capable of controlling accurately an increasing rate of an engine speed. <P>SOLUTION: A valve element 32 of the intake cushion valve 31 is provided in a downstream of a throttle valve 46. The valve element 32 is formed to constitute one portion of a wall 28a of an intake passage 28. One end part of the valve element 32 is formed to be advanced and retracted to/from the intake passage 28 by turning thereof. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intake device for an engine that controls a passage area to be optimized by an intake control valve when an opening area of a throttle valve is excessively larger than an optimum area.
[0002]
[Prior art]
As a conventional intake control valve of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 2001-263186, there is a butterfly valve type having a structure equivalent to a throttle valve. The intake control valve is provided upstream of the throttle valve with the valve axis parallel to the valve axis of the throttle valve, and is driven by an actuator such as a servomotor.
[0003]
The above-described conventional intake control valve is configured to open later than the throttle valve so that the passage cross-sectional area of the intake passage does not increase rapidly, for example, when the throttle valve is rapidly opened. . That is, the intake control valve is controlled such that an optimum passage cross-sectional area determined based on the throttle valve opening and the engine speed (a passage cross-sectional area that maximizes the engine output at that time) is obtained. I have.
The applicant has not found any prior art documents related to the present invention other than the prior art documents specified by the prior art document information described in the present specification by the time of filing.
[0004]
[Patent Document 1]
JP-A-2001-263186 (FIGS. 2 and 4)
[0005]
[Problems to be solved by the invention]
However, the conventional intake device including the intake control valve configured as described above has a problem that the output of the engine cannot be improved due to a large intake resistance. The reason why the intake resistance is increased is that the intake control valve is constituted by a butterfly valve, and the valve body and the valve shaft of the intake control valve are present in the intake passage even when the throttle valve is fully opened. .
[0006]
In addition, the conventional intake device has a problem that control responsiveness is low and an engine output as desired cannot be obtained. This is because an intake control valve is provided on the upstream side of the throttle valve, and even if an attempt is made to control the intake intake air amount, a large amount of air existing downstream of the intake control valve is sucked into the engine. It is believed that there is.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to increase the output of an engine and to provide an intake device for an engine having an intake control valve capable of accurately controlling the rate of increase of the engine speed. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve this object, in the intake device for an engine according to the present invention, a valve body of an intake control valve is provided on a downstream side of a throttle valve, and the valve body is formed so as to constitute a part of a wall of an intake passage. In addition, it is formed such that one end protrudes and retracts with respect to the intake passage by rotating.
[0009]
According to the present invention, since the valve body of the intake control valve forms a part of the wall of the intake passage, the intake control valve has no member that crosses in the intake passage, so that intake resistance can be reduced. it can.
Further, since the intake control valve is provided downstream of the throttle valve, the intake control valve can throttle the intake air while the intake air is being taken into the engine after the throttle valve is rapidly opened.
[0010]
According to a second aspect of the present invention, in the intake system for an engine according to the first aspect, the valve body is adjacent to the intake passage with a surface exposed in the intake passage being fully open. It is formed so as to be located substantially on the same plane as the wall surface.
According to the present invention, the valve body can be formed so as not to protrude into the intake passage in the fully opened state.
[0011]
According to a third aspect of the present invention, there is provided an intake system for an engine according to the first or second aspect of the invention, wherein a fuel for an injector is provided between a valve body of an intake control valve and a throttle valve. It is the one that the injection port was opened.
According to the present invention, since the intake control valve is positioned downstream of the fuel injection port, and the venturi is formed by the intake control valve, the flow velocity of the mist-like fuel flowing on the intake air is increased by the venturi. Therefore, it is possible to prevent mist-like fuel particles from adhering to the intake passage wall surface.
[0012]
An intake device for an engine according to a fourth aspect of the present invention is the intake device for an engine according to any one of the first to third aspects, wherein a plurality of intake ports per cylinder are formed in the cylinder head. An intake control valve is provided in an intake manifold between the cylinder head and the throttle body.
[0013]
According to the present invention, when forming the intake passage so as to be branched for each intake port between the throttle body and the cylinder head, the intake passage is formed such that the shape of the passage cross section gradually changes in the intake manifold. In addition, the intake resistance can be reduced. As described above, since the intake manifold is used for reducing the intake resistance, the intake control valve is provided, so that the passage member used exclusively for providing the intake control valve becomes unnecessary.
[0014]
According to a fifth aspect of the present invention, there is provided the engine intake device according to any one of the first to fourth aspects of the invention, wherein the rotation control portion of the intake control valve is provided on the upstream side. In this arrangement, the downstream side of the intake control valve protrudes and retracts into the intake passage, and the pivoting support portion and the opening side of the throttle valve are positioned on the same side.
Here, the opening side of the throttle valve is a portion where a gap is formed between the throttle valve and the inner wall surface of the intake passage so that intake air flows most.
[0015]
The intake air passing through the opening side of the throttle portion flows to one side in the intake passage downstream of the throttle valve. According to the present invention, the intake air flowing to the one side portion passes near the intake control valve, so that the intake control by the intake control valve can be efficiently performed.
[0016]
According to a sixth aspect of the present invention, there is provided an intake device for an engine according to any one of the first to fifth aspects of the invention, wherein the pivot control portion of the intake control valve and the injector mounting portion are provided. Are positioned on the same side.
According to the present invention, it is difficult for the fuel to hit the intake control valve unless the intake control valve is in the fully closed state or a state close to the fully closed state.
[0017]
According to a seventh aspect of the present invention, in the engine intake device according to any one of the first to sixth aspects, the valve body of the intake control valve is attached to a cylinder head. Is rotatably supported by a member for forming an intake passage, and is formed so that a rotating end portion faces the inside of an intake port of the cylinder head in a fully opened state.
According to the present invention, the valve body of the intake control valve can be formed relatively large while the overall length of the intake passage forming member is reduced.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Hereinafter, an embodiment of an intake device for an engine according to the present invention will be described in detail with reference to FIGS.
1 is a side view of a motorcycle engine equipped with an intake device according to the present invention, FIG. 2 is a sectional view of an intake passage showing a sectional view of an intake control valve and a throttle valve, and FIG. 3 is an enlarged view of the intake control valve. 2A is a cross-sectional view, FIG. 2B is a vertical cross-sectional view, and FIG. 1C is a cross-sectional view taken along line CC in FIG. 1B. 4A and 4B are diagrams for explaining the operation of the intake control valve. FIG. 4A shows a state where the angle of the valve body is 10 °, and FIG. 4B shows a state where the angle of the valve body is 20 °. (C) shows a state where the angle of the valve body is 30 °, (d) shows a state where the angle of the valve body is 40 °, and (e) shows a state where the angle of the valve body is 45 °. Indicates the state of °. FIG. 5 is a view showing the shape of the opening of the intake port, and FIG. 6 is a sectional view showing an example using a slide-type throttle valve.
[0019]
In these figures, the reference numeral 1 designates a DOHC type four-cylinder engine for a motorcycle according to this embodiment. In FIG. 1, 2 indicates a cylinder body, 3 indicates a crankcase, 4 indicates a cylinder head, 5 indicates a head cover, 6 indicates an intake camshaft, 7 indicates an exhaust camshaft, 8 indicates an intake valve, 9 indicates an exhaust valve, and 10 indicates intake. Port 11 indicates an exhaust port. Since the internal structure of the engine 1 is the same as that of the conventional engine, detailed description is omitted here.
[0020]
Although not shown, the front end of the cylinder body 2 is supported by a down tube of a motorcycle body frame, and the rear end of the cylinder body 2 and the crankcase 3 are supported by a rear arm bracket 12. The crankshaft 13 is mounted on the vehicle body with the axis of the cylinder inclined forward and the axis of the crankshaft 13 oriented in the vehicle width direction.
[0021]
The cylinder head 4 is provided with three intake valves 8 and two exhaust valves 9 per cylinder. The three intake ports 10 opened and closed by the three intake valves 8 are opened at the rear surface of the cylinder head 4 so as to point obliquely rearward and upward, and are connected to the intake device 21 according to the present invention. An exhaust port 11 opened and closed by the exhaust valve 9 is opened on the front surface of the cylinder head 4 and is connected to an exhaust pipe 22.
[0022]
The intake device 21 includes an intake manifold 23 attached to the cylinder head 4, a throttle valve device 24 attached to an upstream end of the intake manifold 23, and an intake box formed to surround the throttle valve device 24. 25, and first and second injectors 26 and 27 provided in the throttle valve device 24, and the like. The intake device 21 is provided with an intake manifold 23 and a throttle valve device 24 for each cylinder, and is configured to supply intake air to three intake ports 10 of each cylinder from one throttle valve device 24 for each cylinder. ing.
That is, in the intake device 21 according to this embodiment, four sets of the intake manifold 23 and the throttle valve device 24 shown in FIG. 2 are arranged side by side in the vehicle width direction, and the four throttle valve devices 24 are provided in one intake box 25. Is contained.
[0023]
As shown in FIGS. 1 to 3, the intake manifold 23 has an intake passage 28 formed therein. The intake manifold 28 is located on the opposite side of the intake passage 28 from the head cover 5 (the right side in FIGS. 1 and 2). An intake control valve 31 is provided on one side of the rear side of the vehicle (hereinafter, this one side is referred to as a rear side).
As shown in FIG. 3 (c), the intake passage 28 in the intake manifold 23 is formed so as to connect the circular opening 23a at the upstream end and the oval opening 23b at the downstream end. It is formed such that the cross-sectional shape gradually changes from the upstream side to the downstream side.
[0024]
The opening 23b at the downstream end is formed to be longer in the vehicle width direction so as to correspond to three intake ports 10 formed per cylinder in the cylinder head 4. FIG. 5 shows an opening portion of the intake port 10 in the cylinder head 4 (a portion where the intake manifold 23 is mounted). The opening of the intake port 10 is formed by arranging the three intake ports 10 in a line in the vehicle width direction, and is open in an oval shape.
[0025]
In order to form the intake passage in a forked shape so as to extend from one throttle valve device 24 to the three intake ports 10, as shown in this embodiment, an intake manifold 23 is provided in the middle and the passage cross-sectional shape is reduced. A gradual change is important in reducing intake resistance. Thus, the intake manifold 23 used for reducing the intake resistance is provided with the intake control valve 31 according to the present invention.
[0026]
As shown in FIGS. 2 and 3, the intake control valve 31 includes a valve body 32 formed in a plate shape so as to form a part of a rear wall 28 a of the intake passage 28 in the intake manifold 23. An actuator having a tubular support shaft 33 integrally formed at one end of the body 32 located upstream of the intake passage 28 and extending in the vehicle width direction, and a drive shaft 34 fixed through the support shaft 33. 35 and the like.
The valve body 32 is rotatably supported by the intake manifold 23 by fitting the support shaft 33 formed integrally therewith into a shaft hole 36 of the intake manifold 23. The drive shaft 34 is provided in parallel with the major axis direction of an oval cross section of the intake passage 28. By adopting this configuration, the amount of protrusion of the intake control valve 31 when fully closed can be reduced, and the rotation angle can be reduced to improve the responsiveness.
[0027]
The rotation direction when the valve body 32 is closed is clockwise in FIG. 2, as indicated by an arrow A in FIG. 2, and is the same direction as the rotation direction when the throttle valve described later is opened. The valve body 32 is housed in a concave portion 37 formed in the wall 28a of the intake manifold 23 in the fully opened state. In the fully closed state, as shown in FIGS. It rotates in the direction and projects into the intake passage 28. FIG. 3C is a cross-sectional view taken along the line CC when the valve element 32 in FIG. 3B is in a fully closed state. That is, the valve element 32 is configured to rotate around one end located upstream of the intake passage 28 and to have the other end (downstream end) protruding and retracting with respect to the intake passage 28. I have.
[0028]
By rotating the valve element 32 from the fully open position to the fully closed position, the opening area of the intake passage 28 gradually decreases as shown in FIGS. FIG. 4A illustrates a state in which the valve element 32 is rotated clockwise by 10 ° to the closing side from the fully open position in FIG. 3B. The rotation angle of the valve element 32 shown in FIG. 4B is 20 °, the rotation angle shown in FIG. 4C is 30 °, and the rotation angle shown in FIG. ) Is 45 °. FIG. 4E shows a state where the valve body 32 is fully closed.
[0029]
As shown in FIG. 3B, when the valve body 32 is fully opened in the recess 37, the surface 32a exposed in the intake passage 28 is substantially equal to the wall surface 38 adjacent to the intake passage 28. They are formed so as to be located on the same plane. That is, when the valve body 32 is in the fully open state, the wall surface 38 and both side surfaces 39 (concave curved surface having an arc-shaped cross section) of the downstream end of the intake manifold 23 are smoothly formed on the surface 32a of the valve body 32, respectively. Connecting.
[0030]
As shown in FIG. 3C, the support shaft 33 is formed to have a length substantially equal to the lateral width of the intake passage 28, and the valve body 32 is provided at a central portion in the axial direction.
The drive shaft 34 is fixed to the support shaft 33 in a state where the drive shaft 34 penetrates the axis of the support shaft 33. The drive shafts 34 according to this embodiment are provided on four intake manifolds 23 arranged in the vehicle width direction, and are connected to each other by a universal joint (not shown) so as to interlock with each other. The shaft assembly formed by connecting the four drive shafts 34 has an actuator 35 connected to the left end of the vehicle body and detects the rotation angle of the valve body 32 at the right end of the vehicle body. Angle sensor 40 (see FIG. 2) is connected. The rotation angle sensor 40 is configured to transmit data indicating the rotation angle of the valve body 32 to the controller 41 (see FIG. 1). The drive shaft 34 is provided with a torsion coil spring (not shown) for urging the drive shaft 34 in the opening direction.
[0031]
As shown in FIG. 1, the actuator 35 has a configuration in which a servomotor 44 is connected to the drive shaft 34 via a pulley 42 and two wires 43, 43. The servo motor 44 is connected to the controller 41 and is operated by a control signal sent from the controller 41 to rotate the drive shaft 34 together with the valve 32 against the elastic force of the torsion coil spring. Let it.
[0032]
As shown in FIG. 2, the throttle valve device 24 has a structure in which a throttle valve 46 composed of a butterfly valve is provided on a throttle body 45, and a first wall is provided on a rear wall 47 located on the vehicle body rear side of the throttle body 45. An injector 26 is mounted. An air funnel 45a is attached to the upstream end of the throttle body 45 by a fixing bolt (not shown). The intake passage 48 in the throttle body 45 has a circular cross section. As the throttle valve 46, besides the above-mentioned butterfly valve type, a structure in which the valve body 46a slides with respect to the throttle body 45 as shown in FIG. 6 can be used. 6, the same reference numerals are given to members equivalent to those shown in FIG.
[0033]
A valve shaft 46a of the throttle valve 46 is rotatably supported by penetrating through the throttle body 45 with its axis directed in the vehicle width direction. A throttle opening sensor 49 for detecting the valve opening) is connected. In this embodiment, a valve shaft 46a is provided in each throttle body 45 for each cylinder, and these four valve shafts 46a are connected so as to interlock with each other. A throttle wire (not shown) is connected to the four valve shafts 46a in the middle. The throttle opening sensor 49 is configured to transmit throttle valve opening data to the controller 41, and is connected to a shaft end of a valve shaft 46a located at the right end of the vehicle body.
[0034]
The valve body 46b of the throttle valve 46 is fixed to the valve shaft 46a so as to rotate in a direction indicated by an arrow B in FIG. 2 (clockwise in FIG. 2) when the valve is opened. FIG. 2 illustrates the throttle valve 46 opened from the idling position to the low-speed operation position. By setting the opening direction of the valve body 32 in this way, the intake air flows so as to approach the rear wall 47 of the throttle body 45 along the valve body 46b when passing through the throttle valve device 24. At this time, the direction in which the intake air flows is indicated by a white arrow in FIG. Then, the intake air flows downstream through a gap between the throttle valve 46 and the rear wall 47. On the downstream side, the intake control valve 31 is positioned. The opening side of the throttle valve 46 according to the present invention refers to a portion of the valve body 46b where the gap is formed between the valve body 46b and the rear wall 47. The open side of the slide-type throttle valve 46 shown in FIG. 6 is the tip of the valve body 46a.
[0035]
As the first and second injectors 26 and 27 provided in the throttle valve device 24, those equivalent to those conventionally well known are used. As shown in FIG. 2, the first injector 26 is inclined rearward by an angle α with respect to the center line C of the intake passage 48, and the first injector 26 is connected to the valve body 32 of the intake control valve 31 and the throttle valve 46. It is attached to the throttle body 45 so that the fuel injection port 26a at the front end is open. The second injector 27 is supported by the first injector 26 via a support stay 51 (see FIG. 1), and is disposed above the air funnel 45a.
[0036]
The second injector 27 is set such that the axis is substantially parallel to the center line C of the intake passage 48 in the throttle body 45. The first injector 26 supplies fuel over the entire engine operating range, while the second injector 27 supplementarily supplies fuel only during high-speed, high-load operation. When the throttle valve 46 is fully open, fuel is supplied only from the second injector 27.
The intake box 25 accommodating the throttle valve device 24 is provided with a duct 52 at the front end, through which the traveling wind is introduced, and the pressure of the traveling wind is applied to the intake passage in the throttle body 45. 48.
[0037]
The controller 41 to which the servomotor 44 and the two sensors 40 and 49 are connected has a circuit for controlling the intake control valve 31 based on a control valve opening map (not shown). The map shows the control valve opening based on the opening of the throttle valve 46 and two parameters of the engine speed, and the control valve opening at which the output of the engine becomes maximum at that time is obtained. It is configured as follows. In addition, as a parameter for determining the control valve opening, a vehicle speed, a negative pressure in the intake passage, a dynamic pressure introduced into the intake box 25, and the like can be added.
[0038]
According to this embodiment, for example, when the throttle valve 46 is rapidly opened to the fully open state in the low rotation speed / low load operation state, in other words, the change in the vehicle speed sensitively follows the change in the opening degree of the throttle valve 46. In such a case, the valve body 32 rotates from the fully closed state to any one of the optimum states in FIG.
The angle at which the valve element 32 rotates is set so as to be in one of the states shown in FIGS. When the valve body 32 rotates, the controller 41 controls the servomotor 44 so that the angle of the valve body 32 detected by the rotation angle sensor 40 matches the target angle obtained based on the above factors.
[0039]
By operating the intake control valve 31 as described above, the intake air is controlled on the downstream side of the throttle valve 46, and the intake air amount is controlled such that the engine output is maximized at any time. Therefore, when the throttle valve 46 is rapidly opened, the engine speed is increased at an appropriate rotation rate, and the throttle work is facilitated. The valve body 32 that has once rotated to the closing side is gradually returned by the servomotor 44 so as to reach a fully open state.
[0040]
In the intake device 21 configured as described above, the valve body 32 of the intake control valve 31 is formed so as to constitute a part of the wall 28a of the intake passage 28, and a member that crosses the inside of the intake passage 28 is provided. Since the intake control valve 31 is not provided, the intake resistance can be reduced as compared with a conventional intake control valve 31 configured by a butterfly valve. For this reason, the output of the engine 1 could be improved by equipping the intake device 21.
[0041]
Further, since the intake control valve 31 is provided on the downstream side of the throttle valve 46, the intake control valve 31 can restrict the intake air while the throttle valve 46 is rapidly opened and the intake air is drawn into the engine 1. Therefore, when the throttle valve 46 is rapidly opened, the intake control valve 31 can reliably prevent a large amount of air existing downstream of the throttle valve 46 from being sucked into the engine 1.
[0042]
The valve body 32 of the intake control valve 31 is formed so that the surface 32a exposed in the intake passage 28 is located on the substantially same plane as the adjacent wall surfaces 38 and 39 of the intake passage 28 in a fully opened state. In this state, the valve body 32 does not protrude into the intake passage 28. Therefore, in a state where the opening of the throttle valve 46 is almost fully opened (a state where the intake control valve 31 is fully opened), the intake resistance is not increased by the intake control valve 31, and the intake resistance can be further reduced. Yes, the maximum output increases.
[0043]
In the intake device 21 according to this embodiment, since the fuel injection port 26a of the first injector 26 is located between the valve body 32 of the intake control valve 31 and the throttle valve 46, the intake device 21 flows so as to ride on the intake air. The mist-like fuel can be controlled by the intake control valve 31. That is, since a venturi is formed by the intake control valve 31 and the flow rate of the mist-like fuel flowing so as to ride on the intake air is increased by the venturi, it is possible to prevent the particles of the mist-like fuel from adhering to the intake passage wall surface. it can.
[0044]
Further, in this embodiment, three intake ports are formed per cylinder in the cylinder head 4, and the intake control valve 31 is provided in the intake manifold 23 between the cylinder head 4 and the throttle body 45. In forming the intake passage between the throttle body 45 and the cylinder head 4 so as to be branched for each intake port 10, the intake passage 28 is formed so that the cross-sectional shape of the passage gradually changes in the intake manifold 23. In addition, the intake resistance can be reduced. As described above, since the intake control valve 31 is provided in the intake manifold 23 used for reducing the intake resistance, a passage member exclusively used for providing the intake control valve 31 is not required.
[0045]
In addition, the intake device 21 according to the present embodiment is configured such that the pivot portion (support shaft 33) of the intake control valve 31 is positioned on the upstream side, and the downstream side of the intake control valve 31 projects into the intake passage 28. Since the pivot portion and the opening side of the throttle valve 46 are located on the same side, the flow direction is changed by the valve body 46b of the throttle valve 46, so that it is biased to one side in the intake passage 48. The flowing intake air passes near the intake control valve 31. Therefore, the intake control by the intake control valve 31 can be efficiently performed.
[0046]
Furthermore, according to this embodiment, since the pivot portion (support shaft 33) of the intake control valve 31 and the injector mounting portion are located on the same side, the intake control valve 31 is fully closed or fully closed. Unless the state is close to the closed state, the fuel hardly hits the intake control valve 31, so that the fuel is less likely to be blocked by the intake control valve 31, and the output can be improved.
[0047]
Further, as the operation of the intake control valve 31, the intake control valve 31 is always driven so as to be linked with the opening / closing operation of the throttle valve 46, and when the throttle valve 46 is rapidly opened, the opening operation of the intake control valve 31 is delayed. It can also be configured as follows. In particular, the intake control valve 31 is closed only when the opening speed of the throttle valve 46 is high and the intake air is throttled, so that the intake control valve 31 does not increase the intake resistance when the intake control valve 31 is not necessary. As a result, the output of the engine 1 can be improved as compared with the case of adopting the other form.
[0048]
In the above-described embodiment, the first injector 26 is attached to the rear wall 47 of the throttle body 45, and the axis of the first injector 26 is inclined at an angle α with respect to the center line C of the intake passage 48. Therefore, when the rotation angle of the valve body 32 of the intake control valve 31 is small (close to the fully opened state), it is difficult for the fuel to hit the valve body 32. Therefore, when the opening speed of the throttle valve 46 is relatively low, that is, when the vehicle speed is stable, the fuel is smoothly supplied to the engine 1 without being interrupted by the intake control valve 31 on the way. Therefore, the air-fuel ratio can be accurately controlled, and the fuel efficiency can be improved.
[0049]
Furthermore, since the intake control valve 31 according to the above-described embodiment is driven by the servomotor 44, the timing of opening and closing, the degree of opening, and the like can be freely set. Therefore, the settings can be changed so as to obtain the optimum engine characteristics.
[0050]
(Second embodiment)
The intake system for an engine according to the seventh aspect of the present invention will be described in detail with reference to FIGS.
7 is a sectional view showing another embodiment of the intake control valve, FIG. 8 is a plan view showing a part of the intake manifold cut away, FIG. 9 is a side view of the intake manifold, and FIG. 10 is an intake manifold of all cylinders. And FIG. 11 is a perspective view showing a schematic configuration of the intake control valve and the intake passage, with the intake control valve and the intake passage partially broken. FIG. 12 is a perspective view showing a schematic shape of the intake port. In these drawings, the same or equivalent members as those described with reference to FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description will be appropriately omitted.
[0051]
The intake control valve shown in FIG. 7 has a length (the length of the valve body 32 (so that the opening area of the intake passage 28 when fully closed can be made smaller than that of the intake control valve shown in the above-described first embodiment). The length (the length in the direction orthogonal to the rotation axis) is formed long. More specifically, the valve body 32 is formed to have a length such that a rotation end protrudes from the cylinder head side end of the intake manifold 23 into the intake port 10 in the fully opened state shown in FIG. A concave portion 51 for accommodating the valve element 32 is formed in a portion of the cylinder head 4 facing the valve element 32.
[0052]
The concave portion 51 is formed so as to be connected without a step between the concave portion 37 for accommodating the valve body of the intake manifold 23, and the surface 32 a of the valve body 32 accommodated therein (exposed to the intake passage 28). (Surface) is formed so as to be located substantially on the same plane as the passage wall surface 10a of the intake port 10. That is, when the valve body 32 is in the fully open state as shown in FIG. 7, the passage wall surface 10a and the inner wall surface of the intake manifold 23 are smoothly connected to the surface 32a of the valve body 32.
[0053]
In the engine equipped with the intake control valve 31 in which the valve body 32 is formed relatively large as described above, the throttle valve 46 opens more rapidly than in the case where the intake control valve shown in the first embodiment is used. When the intake control valve 31 is fully closed (when the intake control valve 31 is fully closed), the rate of increase of the engine speed can be controlled more accurately.
[0054]
In addition, the intake control valve 31 according to this embodiment has a configuration in which the rotating end of the valve body 32 projects from the intake manifold 23 toward the cylinder head 4 when the valve body 32 is formed large. A large valve body 32 can be provided without making the entire length of the intake manifold 23 long. For this reason, the intake manifold 23 can be formed in a small size as compared with the configuration in which the entire large valve element 32 is housed in the intake manifold 23 (the configuration of the first embodiment), and the throttle valve can be removed from the combustion chamber. The distance up to 46, the so-called intake pipe length, can be made shorter.
[0055]
As shown in FIGS. 8 to 10, four intake control valves 31 according to this embodiment are connected to each other via a joint 52 so as to interlock with each other through four joints. Each intake control valve 31 is provided with a return spring 53 for urging the valve body 32 in the opening direction. The return spring 53 is formed of a torsion coil spring, and is fitted and held on a boss 54a of a return lever 54 fixed to the drive shaft 34 of the intake control valve 31, as shown in FIG. The valve body 32 is elastically mounted between the intake manifold 23 and the valve body 32 so as to urge the valve body 32 in the opening direction.
[0056]
By providing the return spring 53 for each intake control valve 31 in this manner, when the driving wire 43 (see FIGS. 1 and 10) is cut, or when the joint 54 becomes loose or breaks, the return spring 53 is provided. Since the valve element 32 returns to the fully open position by the resilience of 53, in such a case, the valve element 32 can prevent the intake resistance from unnecessarily increasing.
[0057]
In the above-described second embodiment, the example in which the intake control valve 31 is provided in the intake manifold 23 has been described. However, when the throttle valve device 24 is directly mounted on the cylinder head 4 instead of the intake manifold 23, An intake control valve 31 is provided in the throttle valve device 24.
[0058]
【The invention's effect】
As described above, according to the present invention, since the intake control valve does not have a member that crosses the intake passage in the intake control valve, the intake resistance can be reduced, and the output of the engine can be increased. .
Further, since the intake control valve is provided downstream of the throttle valve, the intake control valve can throttle the intake air while the intake air is being taken into the engine after the throttle valve is rapidly opened. Therefore, when the throttle valve is rapidly opened, it is possible to reliably prevent a large amount of air existing downstream of the throttle valve from being sucked into the engine, and to accurately control the rate of increase of the engine speed. be able to.
[0059]
According to the second aspect of the present invention, since the valve body can be formed so as not to protrude into the intake passage in the fully opened state, the intake resistance can be further reduced.
According to the third aspect of the present invention, when the throttle valve is rapidly opened, it is possible to prevent the fuel supplied to the engine from increasing by taking in the intake air, and the fuel is accurately controlled by the intake control valve. , The rate of increase of the engine speed can be controlled more accurately.
[0060]
According to the fourth aspect of the present invention, when forming the intake passage so as to be branched for each intake port between the throttle body and the cylinder head, the intake passage is formed so that the shape of the passage cross section gradually changes in the intake manifold. A passage is formed, and intake resistance can be reduced. As described above, since the intake manifold is used for reducing the intake resistance, the intake control valve is provided, so that the passage member used exclusively for providing the intake control valve becomes unnecessary.
Therefore, the intake resistance is further reduced, and a passage member for exclusively providing the intake control valve is not required, so that the cost and size of the intake device can be reduced.
[0061]
According to the fifth aspect of the present invention, since the intake air that has passed through the throttle valve flows more in the vicinity of the intake control valve, the intake control by the intake control valve can be efficiently performed, and the throttle work can be further reduced. It will be easier.
[0062]
According to the invention described in claim 6, since it is difficult for the fuel to hit the intake control valve unless the intake control valve is in a fully closed state or a state close to the fully closed state, the fuel is less likely to be blocked by the intake control valve, Output can be improved.
[0063]
According to the invention described in claim 7, the valve body of the intake control valve can be formed relatively large while the overall length of the intake passage forming member is reduced, and the intake passage when the intake control valve is fully closed. Can be further reduced. Therefore, the responsiveness can be improved by reducing the length of the intake pipe, and the rate of increase in the engine speed can be more accurately controlled by the intake control valve.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle engine equipped with an intake device according to the present invention.
FIG. 2 is a cross-sectional view of an intake passage showing a cross-section of an intake control valve and a throttle valve.
FIG. 3 is an enlarged sectional view showing an intake control valve.
FIG. 4 is a diagram for explaining the operation of an intake control valve.
FIG. 5 is a view showing an opening shape of an intake port.
FIG. 6 is a cross-sectional view showing an example using a slide type throttle valve.
FIG. 7 is a sectional view showing another embodiment of the intake control valve.
FIG. 8 is a plan view showing a part of the intake manifold cut away.
FIG. 9 is a side view of the intake manifold.
FIG. 10 is a plan view showing a state in which intake manifolds of all cylinders are connected.
FIG. 11 is a perspective view showing a schematic configuration of an intake control valve and an intake passage.
FIG. 12 is a perspective view showing a schematic shape of an intake port.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Engine, 4 ... Cylinder head, 10 ... Intake port, 21 ... Intake device, 23 ... Intake manifold, 26 ... First injector, 26a ... Fuel injection port, 28, 48 ... Intake passage, 31 ... Intake control valve, 32: valve body, 32a: surface, 38, 39 ... wall surface, 45: throttle body, 46: throttle valve, 46a: valve shaft, 51: concave portion.

Claims (7)

In an intake device for an engine having an intake control valve capable of controlling an intake air amount separately from a throttle valve, a valve element of the intake control valve is provided downstream of a throttle valve, and the valve element is provided on a wall of an intake passage. An intake device for an engine, which is formed so as to constitute a part of the intake passage, and is formed so that one end thereof protrudes and retracts with respect to an intake passage by rotating. 2. The intake system for an engine according to claim 1, wherein the valve body is formed such that a surface exposed in the intake passage is located substantially flush with an adjacent wall surface of the intake passage in a fully opened state. . 3. The intake system for an engine according to claim 1, wherein a fuel injection port of an injector is opened between a valve body of an intake control valve and a throttle valve. 4. An intake system for an engine according to claim 1, wherein a plurality of intake ports are formed per cylinder in a cylinder head, and an intake control valve is provided in an intake manifold between the cylinder head and a throttle body. Engine intake device provided. The intake device for an engine according to any one of claims 1 to 4, wherein a pivot portion of the intake control valve is positioned on an upstream side, and a downstream side of the intake control valve protrudes and retracts into an intake passage. An intake device for an engine, wherein a pivoting support portion and an opening side of a throttle valve are located on the same side. The intake device for an engine according to any one of claims 1 to 5, wherein the pivot support portion of the intake control valve and the injector mounting portion are located on the same side. The intake device for an engine according to any one of claims 1 to 6, wherein the valve body of the intake control valve is rotatably supported by an intake passage forming member attached to the cylinder head, and is fully open. An intake device for an engine, wherein a rotation end portion is formed so as to face an intake port of a cylinder head.

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