JP4350014B2 - Intake control device - Google Patents

Description

  The present invention relates to an intake control device including a plurality of throttle valves.

For example, in a tandem valve type intake control device equipped with a sub-throttle valve, a link mechanism that links the rotation of the main throttle valve with the rotation of the sub-throttle valve is provided in order to achieve the first idle (FID) function. Are known. That is, when the sub-throttle valve is rotated in the fully opened direction, the main throttle valve at the idle (ID) opening is slightly opened by the link mechanism to the FID opening (see Patent Document 1).
JP 2002-285862 A

  SUMMARY OF THE INVENTION An object of the present invention is to enable a main throttle valve to turn in a valve closing direction regardless of the opening of the sub throttle valve in an intake control device that links the main throttle valve to the sub throttle valve. In particular, an object of the present invention is to provide a simple and low-cost structure capable of returning the main throttle valve from the FID opening to the ID opening regardless of the opening degree of the sub-throttle valve in the tandem valve type intake control device capable of FID control. .

An intake air control apparatus according to the present invention includes a main throttle valve, a sub-throttle valve, and a link mechanism that interlocks opening and closing of the main throttle valve with opening and closing operations of the sub-throttle valve, and the link mechanism includes the sub-throttle valve When the valve is rotated in the valve opening direction, a link lever having a pressing member that presses the throttle lever that rotates together with the main throttle valve and rotates the main throttle valve in the valve opening direction; A positioning mechanism that determines the opening when the main throttle valve is opened in conjunction with the opening and closing operation of the throttle valve, and the positioning mechanism is provided when a torque greater than a predetermined value in the valve closing direction is applied to the throttle lever. The position of the pressing member is corrected by retracting the pressing member and correcting the position of the pressing member. Changing the configuration, the length of the retractable said pressing member, by adjusting the amount of protrusion of the pressing member toward the direction of the throttle lever from the link lever, for adjusting the opening degree of the main throttle valve And a projection amount adjusting mechanism .

For example, the pressing member position correcting mechanism attaches the pressing member slidable in the direction from the link lever to the locking end provided on the throttle lever toward the locking end. The protruding amount adjusting mechanism includes an adjusting screw serving as the pressing member and a contact portion, and the contact portion is screwed to the tip of the adjustment screw, so that the sub-throttle valve is opened. When the valve member is rotated in the valve direction, the abutting portion of the pressing member biased by the elastic member is abutted against the locking end of the throttle lever, and the relative position of the abutting portion with respect to the adjusting screw By adjusting the length of the pressing member, the length of the pressing member biased by the elastic member is changed to adjust the protruding amount of the pressing member.

Further, the adjustment screw is rotatable about the axis of the adjustment screw with respect to the link lever, and the rotation of the contact portion around the axis of the adjustment screw is restricted by the link lever.

  As described above, according to the present invention, in the intake control device that links the main throttle valve to the sub-throttle valve, the main throttle valve can be rotated in the valve closing direction regardless of the opening of the sub-throttle valve. . In addition, in the tandem valve type intake control device capable of FID control, a structure capable of returning the main throttle valve from the FID opening to the ID opening regardless of the opening of the sub-throttle valve can be provided simply and at low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are side views of a tandem valve type intake control apparatus according to an embodiment of the present invention. FIG. 1 shows a state in which both the sub throttle valve and the main throttle valve are closed, and FIG. 2 shows a state in which the sub throttle valve is fully opened and the main throttle valve is at the FID opening.

  An air inflow passage 11 is formed in the intake control device 10, and a sub throttle valve 12 is provided on the upstream side, and a main throttle valve 13 is provided on the downstream side. The sub throttle valve 12 and the main throttle valve 13 are held by throttle shafts 14 and 15, respectively. That is, the opening and closing of the throttle valves 12 and 13 in the air inflow path 11 is controlled by rotating the throttle shafts 14 and 15.

  The throttle shafts 14 and 15 are arranged in parallel to each other, each vertically traverses the central axis of the air inflow passage 11, and extends from both sides of the throttle body to the outside of the throttle body. A cam lever 16 is provided at one end of the sub-throttle shaft 14 extending outside the throttle body, and the other end is connected to, for example, an electromagnetic actuator (not shown) via a gear or the like. A throttle lever 17 is provided at the end of the throttle shaft 15 on the side where the cam lever 16 is provided, and the main throttle valve 13 is closed (clockwise in FIGS. 1 and 2) at the other end. A biasing means for biasing the rotation, for example, a return spring (not shown) is provided.

  Two throttle cables 18 and 19 are attached to the throttle lever 17, and the throttle cables 18 and 19 are respectively led to an accelerator (not shown). When the throttle cable 18 is pulled by the accelerator operation, the throttle lever 17 is rotated counterclockwise in FIGS. 1 and 2, thereby rotating the main throttle valve 13 in the opening direction. On the other hand, since the throttle lever 17 is biased in the closing direction, when the tension of the throttle cable 18 is weakened, the throttle lever 17 is rotated clockwise by the biasing force of the return spring, whereby the main throttle valve 13 is It is turned in the closing direction. Since the throttle cable 19 is attached to the throttle lever 17, the throttle cable 19 is pulled when the accelerator is forcibly returned, and the throttle lever 17 is forcibly rotated clockwise.

  The throttle lever 17 is formed with a locking end 17 a that defines a limit of rotation in the closing direction of the main throttle valve 13. When the main throttle valve 13 is rotated in the closing direction, the locking end 17a is locked by an idle limiter (ID limiter) locking member 20 fixed to the throttle body main body. The throttle lever 17 is engaged with an idle adjustment screw (ID adjustment screw) 21 to adjust an ID opening of the main throttle valve 13 and an idle adjustment end (ID adjustment end) 17b, and a fast idle positioning mechanism (FID positioning). A first idle adjustment end (FID adjustment end) 17c that engages with the mechanism 22 and adjusts the FID opening of the main throttle valve 13.

  The ID adjustment screw 21 is screwed into an ID adjustment screw fixing portion 23 provided in the throttle body, and the protrusion amount of the tip portion from the ID adjustment screw fixing portion 23 is adjusted by the rotation of the ID adjustment screw 21. That is, the position where the ID adjusting end 17b and the tip end of the ID adjusting screw 23 abut is adjusted by the rotation of the ID adjusting screw 21, and the ID adjusting screw 23 is protruded so that the idle limiter 20 and the locking end 17a are projected. It is possible to slightly open the opening of the main throttle valve 13 from the fully closed position defined by the above, whereby the throttle opening of the throttle can be adjusted to an appropriate value.

  On the other hand, the tip of a cap part (contact part) 22a provided in the FID positioning mechanism 22 is brought into contact with the FID adjustment end 17c, and the FID opening is adjusted. In the FID positioning mechanism 22, the amount of protrusion of the cap portion 22a is adjusted by the FID adjustment screw 22b. Details will be described later with reference to FIG. 3 which is a sectional view of the FID positioning mechanism 22.

  The FID positioning mechanism 22 is provided at one end of a link lever 24 that is rotatable about a shaft 24 b, and the other end of the link lever 24 is engaged with the cam lever 16. In the present embodiment, the link lever 24 is engaged with the cam lever 16 via, for example, a roller 24 a that is rotatably attached to the end of the link lever 24. In the present embodiment, the shaft 24b is provided near the FID positioning mechanism 22 between one end engaged with the cam lever 16 and one end provided with the FID positioning mechanism 22, from the shaft 24b to the tip of the cap portion 22a. Is smaller than the distance from the shaft 24 b to the contact point between the roller 24 a and the cam lever 16.

  In the cam lever 16, the link lever 24 is closest to the sub-throttle shaft 14 when the sub-throttle valve 12 is closed, and the link lever 24 is farthest from the sub-throttle shaft 14 when the sub-throttle valve 12 is fully opened. The radius is formed as follows. The link lever 24 is urged by a return spring (not shown) in a direction in which one end of the link lever 24 is pressed against the cam lever 16 (counterclockwise in FIGS. 1 and 2). As shown in FIG. 1, when the sub-throttle valve 12 is fully closed, one end of the link lever 24 is held at a position closest to the sub-throttle shaft 14. When the sub-throttle shaft 14 is rotated in the direction to open the sub-throttle valve 12, the radius of the cam lever 16 that the roller 24a contacts gradually increases, and one end of the link lever 24 that engages with the cam lever 16 is pushed down (FIG. 1). In). That is, the link lever 24 is rotated clockwise in FIG.

  In the state of FIG. 1 (the sub-throttle valve 12 is fully closed), the link lever 24 is in a position where the tip of the cap portion 22a does not contact the FID adjustment end 17c of the throttle lever 17, and the accelerator is not operated. The throttle lever 17 is maintained at the ID opening degree by the engagement of the ID adjusting screw 21 and the ID adjusting end 17b. When the link lever 24 is rotated clockwise about the shaft 24b in conjunction with the rotation of the sub-throttle valve 12 in the opening direction (counterclockwise), the FID positioning mechanism 22 causes the FID adjustment end 17c. Pushed up towards The tip of the cap portion 22a comes into contact with the FID adjustment end 17c of the throttle lever 17 when the sub-throttle valve 12 reaches a predetermined opening degree in the intermediate opening degree between FIG. 1 and FIG. When the sub-throttle valve 12 is further rotated in the opening direction, the tip of the cap portion 22a pushes up the FID adjustment end 17c and rotates the throttle lever 17 counterclockwise. As a result, the main throttle valve 13 is slightly opened from the ID opening to the FID opening (for example, the state shown in FIG. 2 in which the sub-throttle valve 12 is fully opened).

  As described above, the FID control of the main throttle valve 13 interlocked with the rotation operation of the sub throttle valve 12 can be performed by the link mechanism including the cam lever 16 and the link lever 24.

  However, in such a configuration, if the sub-throttle valve 12 does not move with the intermediate opening degree or more due to failure of the electromagnetic actuator or the like, the link lever 24 is also fixed in that state, so the main throttle valve 13 is opened. The degree cannot be returned to the ID opening.

  For these reasons, in the FID positioning mechanism 22 in this embodiment, when the accelerator is forcibly returned and a predetermined rotational force in the closing direction is applied to the throttle lever 17, the cap portion 22a that contacts the FID adjustment end 17c. Is retracted by the pressing force from the FID adjustment end 17c, and the main throttle valve 13 can be returned to the ID opening.

  Next, the configuration of the FID positioning mechanism 22 of this embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1 and a front view seen from the distal end direction of the cap portion 22a.

  The end portion of the link lever 24 constituting the positioning mechanism 22 includes two plate members 22c and 22d extending substantially parallel to the throttle shafts 14 and 15, and the plate members 22c and 22d face each other. That is, in the cross section along the line segment III-III, the plate members 22c and 22d and the end portions of the link lever 24 have a U-shaped cross-sectional shape. The plate member 22c is formed with an opening (or notch) through which the shaft portion of the FID adjustment screw 22b is slidably and rotatably inserted, but the head of the FID adjustment screw 22b cannot pass through. On the other hand, the plate member 22d is formed with an opening (or notch) through which the cap portion 22a is slidably inserted.

  On the inner peripheral surface of the cap portion 22a, a female screw that is screwed with a male screw formed on the shaft portion of the FID adjusting screw 22b is provided. The cap portion 22a is screwed to the FID adjusting screw 22b to constitute a pressing member. . The outer diameter of the front end portion (lower side in FIG. 3) of the cap portion 22a is slightly larger than the outer diameter of the rear end portion (upper side in FIG. 3) on which the FID adjustment screw 22b is inserted. A step is formed at the boundary with the rear end. A washer 22e is locked to the stepped portion, and a compression spring 22f is interposed between the washer 22e and the plate member 22c. That is, the pressing member composed of the cap portion 22a and the FID adjustment screw 22b is urged toward the distal end direction of the cap portion 22a, and the position of the pressing member is fixed and held by the head of the FID adjustment screw 22b being hooked on the plate member 22c. Is done.

  Further, as shown in the front view of the cap portion 22a, the outer periphery of the tip portion of the cap portion 22a is subjected to, for example, D-cut processing, and the opening (or notch) provided in the plate member 22d is formed by this D-cut. It is formed into a shape that matches the cross-sectional shape of the cap portion 22a. That is, the cap portion 22a can be inserted through the plate member 22d in the axial direction, but the rotation about the axis is restricted.

  The cap portion 22a is restricted from rotating about its axis, whereas the FID adjustment screw 22b is rotatable about its axis. Therefore, the protrusion amount of the cap portion 22a can be adjusted by rotating the FID adjustment screw 22b. it can. Further, since the cap portion 22a and the FID adjustment screw 22b can be inserted into the plate members 22c and 22d in the axial direction, respectively, when a predetermined pressing force against the compression spring 22f acts on the tip of the cap portion 22a, the compression spring 22f The tip portion of the cap portion 22a is retracted by being compressed. Therefore, when the accelerator is forcibly returned (the throttle cable 19 is pulled) and a rotational force is applied clockwise (in the direction of closing the main throttle valve 13) to the throttle lever 17, the FID adjustment end 17c of the throttle lever 17 is When the front end of the cap portion 22a is pressed and the pressing force exceeds a predetermined value, the pressing member including the cap portion 22a and the FID adjustment screw 22b is retracted, and the main throttle valve 13 is returned to the position of the ID opening.

  That is, in the intake control device of the present embodiment, a link lever is provided between the sub-throttle and the main throttle to link the main throttle to the sub-throttle within the FID opening. An FID positioning mechanism is provided at one end of the link lever, and the FID positioning mechanism corrects the position of the pressing member according to the pressing member (cap portion and FID adjusting screw) engaged with the throttle lever and the force acting on the pressing member. A pressing member position correcting mechanism is provided. The pressing member can be moved (retracted) relative to the link lever when a closing force greater than a predetermined value is applied to the throttle lever by a pressing member position correction mechanism including a compression spring or the like. The Therefore, in the forced opening / closing type intake control device, when the accelerator is returned and the throttle lever is forcibly rotated in the closing direction, the pressing member is moved to the ID position by the pressing member position correcting mechanism of the FID positioning mechanism. It is retracted to the position where the opening is reached. The FID opening is adjusted by adjusting the position of the cap part with respect to the adjusting screw (adjusting the protruding amount of the cap part).

  As described above, according to the present embodiment, even if the electromagnetic actuator is stopped due to some trouble when the sub-throttle valve is at the intermediate opening or higher, it is forcibly returned from the FID state to the ID state. It becomes possible. Further, for example, when the motorcycle is running while warming up (during FID operation), it is possible to prevent a situation in which the FID is operating and the engine speed is not sufficiently reduced even if the accelerator is returned.

  Further, in this embodiment, only the pressing member consisting of the cap portion and the FID adjustment screw is moved, and the link lever is maintained in its position, so even if the main throttle valve is forcibly returned to the ID opening, No load is applied to the electromagnetic actuator attached to the shaft of the sub-throttle valve. Furthermore, the FID positioning mechanism of the present embodiment is configured such that the pressing member having the cap portion attached to the FID adjusting screw and the end portion of the link lever are bent into a U shape, and a compression spring is provided between the pressing member and the bent portion. Since it is comprised from the press member position correction | amendment mechanism comprised by interposing, a structure becomes simple, a component structure is simplified and an assembly becomes easy. In addition, since the structure is simple, the reliability is high in terms of performance durability, and the manufacturing cost can be kept low.

  In this embodiment, D-cut processing is performed to restrict the rotation of the cap portion. However, any configuration may be used as long as the rotation of the cap portion can be restricted. In this embodiment, a compression spring is used for the FID positioning mechanism, but other elastic members may be used.

  In the present embodiment, the pressing member is composed of a cap portion and an adjusting screw. However, for example, when it is not necessary to adjust the FID opening, the pressing portion can be composed of, for example, one member. Further, even if the member provided with the screw is used as the contact portion and the cap-shaped member can be rotated, substantially the same effect as in the present embodiment can be obtained. Moreover, you may use the structure using a screw other than this embodiment, or the structure which does not use a screw for adjustment of the protrusion amount toward the FID adjustment end (locking end) of a pressing member.

It is a side view of the intake control device which is one embodiment of the present invention, and shows a state where both the main throttle valve and the sub throttle valve are closed. It is a side view of the intake control device which is one embodiment of the present invention, and shows the state of FID with the sub-throttle fully opened. FIG. 3 is a cross-sectional view of the FID positioning mechanism according to the present embodiment taken along line III-III in FIG.

Explanation of symbols

10 Intake Control Device 12 Sub Throttle Valve 13 Main Throttle Valve 16 Cam Lever 17 Throttle Lever 22 FID Positioning Mechanism 24 Link Lever

Claims (3)

The main throttle valve,
A sub-throttle valve,
A link mechanism that interlocks opening and closing of the main throttle valve with the opening and closing operation of the sub-throttle valve,
When the sub-throttle valve is rotated in the valve opening direction, the link mechanism presses a throttle lever that rotates together with the main throttle valve to rotate the main throttle valve in the valve opening direction. A link lever having
A positioning mechanism that determines the opening when the main throttle valve is opened in conjunction with the opening and closing operation of the sub-throttle valve ;
The positioning mechanism includes a pressing member position correcting mechanism that retracts the pressing member to correct the position of the pressing member when a predetermined rotational force in the valve closing direction is applied to the throttle lever .
Adjusting the amount of protrusion of the main throttle valve by changing the length of the retractable pressing member and adjusting the amount of protrusion of the pressing member from the link lever toward the throttle lever intake air control device, characterized in that it comprises a mechanism. The pressing member position correcting mechanism biases the pressing member, which is slidable in a direction from the link lever toward the locking end provided on the throttle lever, toward the locking end. Comprising an elastic member,
The protruding amount adjusting mechanism includes an adjusting screw and a contact portion as the pressing member ,
When the abutting portion is screwed to the tip of the adjusting screw and the sub-throttle valve is rotated in the valve opening direction, the abutting portion of the pressing member biased by the elastic member is the throttle lever. The abutting end of the
The protrusion amount of the pressing member is adjusted by changing a length of the pressing member biased by the elastic member by adjusting a relative position of the contact portion with respect to the adjusting screw. Item 2. The intake control device according to Item 1. The adjusting screw is rotatable about the axis of the adjusting screw with respect to the link lever;
The intake control device according to claim 2, wherein rotation of the abutment portion around the axis of the adjustment task screw is restricted by the link lever .