JP2005290995A - Valve shaft coupling mechanism of multiple throttle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain tuning performance more reliably with respect to any rotation in an opening direction and a closing direction in a valve shaft coupling mechanism of a multiple throttle.
SOLUTION: A first connecting portion 17 attached to a first valve shaft 12 is provided with first and second plate members 19 and 20 that face each other parallel to the shaft axis. Between the 1st and 2nd board members 19 and 20, the 3rd board member 21 provided in the 2nd connecting part 18 attached to the 2nd valve shaft 14 in parallel with these is arranged. A first adjusting screw 22 in which the third plate member 21 is screwed to the first plate member 19, and a coil spring 24 that is compressed and interposed between the second plate member 20 and the third plate member 21. Hold it. The second adjusting screw 23 is screwed onto the second plate member 20. A minute gap having a distance d is provided between the tip of the second adjustment screw 23 and the third plate member 21.
[Selection] Figure 2

Description

  The present invention relates to a valve shaft coupling mechanism that is used for coupling between valve shafts and used for tuning the valve opening in a multiple throttle.

As the multiple throttle, a valve shaft is independently provided for each throttle, and adjacent valve shafts are connected via a connecting mechanism. In such a multiple throttle, all the throttle valves need to be tuned, so that the coupling mechanism is provided with a tuning mechanism for adjusting the phase between the valve shafts. As the valve shaft coupling mechanism, the other valve shaft is located in a region surrounded by a U-shaped plate member provided on one valve shaft at a position that is a predetermined distance in the radial direction from the axis of the valve shaft. An arrangement is known in which a provided plate member is disposed and the plate member is gripped from both sides by an adjustment screw and a coil spring (see Patent Document 1). That is, according to such a configuration, when the adjusting screw is rotated toward the plate member provided on the other valve shaft, the other valve shaft is pressed by the pressing force of the adjusting screw. When it is rotated in the opposite direction, it is transmitted by the urging force of the coil spring. Further, the phase between the two valve shafts can be adjusted by controlling the protruding amount of the adjusting screw.
Japanese Utility Model Publication No. 43-964

  However, in the above configuration, when the rotational force is transmitted by the pressing force of the adjustment screw that is a rigid body, the other valve shaft immediately follows the movement of the adjustment screw and rotates reliably, but the coil spring that is an elastic body When the rotational force is transmitted by the pressing force of the other, if resistance occurs in the rotation of the other valve shaft, the urging force cannot resist this rotational resistance, resulting in a rotational delay in the other valve shaft or out of synchronization. May be retained. For example, in the case of a closed rigid (a configuration in which the rotational force is transmitted by the pressing force of the adjusting screw when the valve rotates in the closing direction), suddenly opening the valve causes a phase delay problem. In the configuration in which the rotational force is transmitted by the pressing force of the adjusting screw when rotating in the reverse direction), the other valve does not return to the idle opening. Further, when the urging force of the spring is increased with respect to such a problem, there arises a problem that an operation failure occurs and the reproducibility of the idle air amount is deteriorated.

  The present invention has been made in view of the above problems, and provides a valve shaft coupling mechanism that more reliably maintains tuning performance with respect to any rotation in an opening direction and a closing direction in a multiple throttle. The purpose is that.

  The valve shaft coupling mechanism of the present invention is a valve shaft coupling mechanism for coupling two valve shafts and used for tuning the valve opening in a multiple throttle, and includes a first plate member and A first connecting portion that includes a second plate member and is connected to the first valve shaft; and is connected to the second valve shaft and is disposed between the first and second plate members and engages with the first connecting portion. A second connecting portion that transmits the rotation of the first valve shaft to the second valve shaft, and is fixed to the first plate member and is rigidly engaged with the second connecting portion so that the first valve shaft is in the first direction. The first engagement member that presses the second connecting portion to rotate the second valve shaft in the first direction, and is interposed between the second plate member and the second connecting portion. Elastic toward the first engagement member The elastic urging means for urging the first plate and the first valve shaft rotate in the second direction, and when the elastic urging means is compressed by a predetermined amount, the second plate member and the second connecting portion are engaged with the rigid. And a second engaging member for rotating the second connecting portion in the second direction.

  The fixing position of the first engagement member to the first plate member can be adjusted within a range until the second connecting portion compresses the elastic biasing means by a predetermined amount. The first engaging member is, for example, a first adjusting screw that is screwed to the first plate member, and the elastic biasing means is, for example, a coil spring.

  For example, when adjacent windings of the coil spring are in close contact with each other, the coil spring functions as the second engagement member.

  Further, for example, the second engagement member is formed of a rigid member fixed to the second plate member, and a gap is provided in a predetermined amount range between the distal end of the second engagement member and the second coupling portion. . At this time, the second engaging member is preferably a second adjusting screw screwed to the second plate member, and the width of the gap can be adjusted by the second adjusting screw.

  Further, for example, the second engagement member is constituted by a rigid member interposed between the second plate member and the second coupling portion, and the tip of the second engagement member is second coupled by the elastic biasing means. When the elastic biasing means is compressed by a predetermined amount, the second engaging member comes into contact with the second plate member and engages between the second connecting portion and the second plate member in a rigid manner.

  As described above, according to the present invention, it is possible to provide a valve shaft coupling mechanism that more reliably maintains the tuning performance with respect to any rotation in the opening direction and the closing direction in the multiple throttle. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a side sectional view of a valve shaft coupling mechanism according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a throttle body taken along line II-II in FIG. 1, and II′- in FIG. It is sectional drawing of the valve shaft connection mechanism in alignment with line II '. However, in FIG. 1, only a part of the connecting portion provided on the valve shaft disposed on the front side of the drawing is illustrated. Hereinafter, the valve shaft coupling mechanism of the first embodiment will be described with reference to FIGS. 1 and 2.

  The valve shaft coupling mechanism 10 includes a first valve shaft 12 provided on the first throttle body 11 and a second valve shaft 14 provided on the second throttle body 13 and disposed coaxially with the first valve shaft 12. Are connected. A first throttle valve 15 is attached to the first valve shaft 12 in the flow passage 11A of the throttle body 11, and a second throttle valve 16 is attached to the second valve shaft 14 in the flow passage 13A of the second throttle body 13. Is attached. 1 and 2, the first and second throttle valves 15 and 16 are shown in a closed state.

  On the other hand, a first connecting portion 17 is provided at one end of the first valve shaft 12, and a second connecting portion 18 is provided at one end of the second valve shaft 14. The first connecting portion 17 includes a plate member having a U-shaped cross section, and includes first and second plate members 19 and 20 that face each other. On the other hand, the second connecting portion 18 includes a third plate member 21. In FIG. 1, only the third plate member 21 of the second connecting portion 18 is depicted.

  The first and second plate members 19 and 20 of the first connecting portion 17 are arranged in parallel to the first and second valve shafts 12 and 14, and the third plate member 21 of the second connecting portion 18 is the first and second plate members. The two plate members 19 and 20 are arranged in parallel. Further, the first plate member 19 is formed with a screw hole 19A, and, for example, a first adjustment screw (first engagement member) 22 is screwed as a rigid member (a member having rigidity). On the other hand, a screw hole 20A is formed in the second plate member 20, and, for example, a second adjustment screw (second engagement member) 23 is screwed as a rigid member.

  The first adjusting screw 22 is attached to the screw hole 19A from the outside of the first plate member 19 and the tip thereof protrudes toward the third plate member 21, and the protruding amount thereof extends to the screw hole 19A of the first adjusting screw 22. It is adjusted by the amount of screwing. In addition, after adjusting the protrusion amount, the position of the first adjusting screw 22 is fixed by the lock nut 22A. On the other hand, the second adjusting screw 23 is attached to the screw hole 20A from the outside of the second plate member 20 and the tip thereof protrudes toward the third plate member 21. The protruding amount is the screw hole 20A of the second adjusting screw 23. It is adjusted by the amount of screwing. Similar to the first adjustment screw 22, after the protrusion amount is adjusted, the position is fixed by the lock nut 23A.

  Further, between the second plate member 20 and the third plate member 21, for example, a coil spring 24 is interposed as an elastic member in a compressed state, and the third plate member 21 is first adjusted by the biasing force. Pressing toward the screw 22 maintains the contact between the third plate member 21 and the first adjusting screw 22. That is, the third plate member 21 is gripped by the first adjustment screw 22 and the coil spring 24, and the first and second plate members 19 and 20 (first connection portion) of the third plate member 21 (second connection portion 18). The relative position with respect to 17) is adjusted by the protruding amount of the first adjustment screw 22. At this time, the tip of the second adjustment screw 23 is positioned at a position separated from the third plate member 21 by, for example, a minute distance d. Accordingly, the amount of protrusion of the first adjusting screw 22 toward the third plate member 21 can be adjusted within a range until the third plate member 21 contacts the tip of the second adjusting screw 23, and the third plate member 21. The relative position of the (second connecting portion 18) with respect to the first and second plate members 19 and 20 (first connecting portion 17) is adjusted within this range.

  As shown in FIG. 1, the first and second adjustment screws 22 and 23 are arranged substantially coaxially along the line II′-II ′, for example, and the coil spring 24 is disposed around the second adjustment screw 23. Arranged to wind. At this time, the line II′-II ′ is arranged at a predetermined distance from the axis of the first and second valve shafts 12, 14 so as to be orthogonal to the axis, When the connected accelerator drive link 25 is operated and the first valve shaft 12 and the first connecting portion 17 are rotated, the third plate member 21 is pressed by the first adjusting screw 22 or the coil spring 24, and the second A rotational force about the axis of the second valve shaft 14 is transmitted to the connecting portion 18, and the second valve shaft 14 is rotated in the same direction as the first valve shaft 12 by the same angle. The first and second valve shafts 12 and 14 are provided with return springs (not shown), respectively, so that a rotational biasing force is applied in a direction to close the first and second throttle valves 15 and 16 as is well known in the art. Yes.

  Further, the position of the second connecting portion 18 with respect to the first connecting portion 17 can be adjusted by adjusting the protruding amount of the first adjusting screw 22, so that the first throttle valve 15 and the second valve shaft 14 are thereby adjusted. The phase angle is adjusted, and the idle opening of the first and second throttle valves 15 and 16 can be synchronized.

  In the valve shaft coupling mechanism 10 of the first embodiment, for example, when the first throttle valve 15 is rotated in the closing direction, the first adjusting screw 22 that is a rigid member presses the third plate member 21 to press the first plate member 21. When the rotational force of the connecting portion 17 is rigidly transmitted to the second connecting portion 18 (with rigidity) and the first throttle valve 15 is rotated in the opening direction, the coil spring 24, which is an elastic member, becomes the third plate member. It is comprised so that the rotational force of the 1st connection part 17 may be elastically transmitted to the 2nd connection part 18 by pressing 21 (closed rigid). In FIG. 1, the clockwise rotation is the rotation in the direction in which the valve opens, and the counterclockwise rotation is the rotation in the direction in which the valve is closed.

  In the present embodiment, when the rotational force is transmitted by the coil spring 24, even if the coil spring 24 is bent, the third plate member is moved to the second adjustment screw 23 when the coil spring 24 is compressed by the distance d. The second adjusting screw 23, which is a rigid member, directly presses the third plate member 21. In other words, the engagement between the third plate member 21 and the second plate member 20 becomes rigid, and the second connecting portion 18 rotates reliably corresponding to the rotation of the first connecting portion 17.

  The configuration of the conventional valve shaft coupling mechanism does not include the second adjusting screw 23 as in the present embodiment, so that, for example, the first coupling portion 17 and the first throttle valve 15 are suddenly moved by the operation of the accelerator drive link 25. When rotated in the valve opening direction, the coil spring 24, which is an elastic member, is compressed until the torque due to the biasing force exceeds the rotational resistance and the inertia torque of the second connecting portion 18 and the second throttle valve 16. The compression amount (deflection amount) of the coil spring 24 decreases as the value of the spring constant increases. However, if the spring constant is set to a large value, the reproducibility of the idle opening at each throttle is lowered, resulting in operational problems. Therefore, there is a limit to reducing the deflection of the coil spring 24 by controlling the spring constant.

  Therefore, in the conventional valve shaft coupling mechanism, the deflection of the coil spring 24 increases, and as a result, the phase (opening degree) of the second throttle valve 16 may deviate significantly from the first throttle valve 15. That is, various rotational resistances are normally applied to the valve shaft, and a large inertia torque is generated during a rapid rotation. In such a case, the coil spring 24 is greatly bent (the coil spring 24 is greatly compressed). Thus, a phase delay that is difficult to ignore occurs in the second throttle valve 16. In general, the second throttle body 13 on the driven side is equipped with a throttle opening sensor (TPS) (not shown). Therefore, when a large phase lag occurs, the control of the air amount and the fuel injection amount is not appropriately performed. This will adversely affect the engine performance.

  However, in the present embodiment, the above problem can be addressed by controlling the distance d (by setting it to a level that does not cause a phase delay that cannot be ignored). In the present embodiment, the distance d can be more precisely controlled by the second adjusting screw 23. The value of the interval d is, for example, 0.5 mm or less, and more preferably 0.1 mm to 0.3 mm.

  As described above, according to the first embodiment of the present invention, even in the closed rigid valve shaft coupling mechanism, it is possible to reliably maintain the tuning performance with respect to the rotation in the opening direction.

  In the present embodiment, the closed rigid valve shaft coupling mechanism has been described. However, the first adjusting screw is screwed to the second plate member, and the coil spring is interposed between the first and third plate members. In addition, the present invention can be applied to an open rigid valve shaft coupling mechanism such as when the second adjusting screw is screwed to the first plate member.

  Next, a valve shaft coupling mechanism according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is an enlarged view of a part of the valve shaft coupling mechanism of the second embodiment. The configuration of the valve shaft coupling mechanism of the second embodiment is substantially the same as that of the first embodiment except for the configuration related to the second adjustment screw. The same reference numerals are used for the same configurations as those in the first embodiment, and the description thereof is omitted.

  In the second embodiment, a rod member (second engagement member) 27 is used instead of the second adjustment screw 23 of the first embodiment. The rod member 27 is formed of a rigid member such as a metal, and includes a rod-shaped main body 27A, a first end portion 27B having a larger outer diameter than the main body 27A, and a second end portion 27C having a smaller outer diameter than the main body 27A. Consists of One end of the coil spring 24 is engaged with a step portion formed between the main body 27A and the first end portion 27B, and the other end is the second plate member 26 of the first connecting portion 17 (the first embodiment of the first embodiment). 2 plate member 20). That is, the coil spring 24 urges the rod member 27 toward the third plate member 21 of the second connecting portion 18, and the tip of the first end portion 27 </ b> B of the rod member 27 contacts the third plate member 21. Then, the third plate member 21 is pressed in the direction of the first adjustment screw 22.

  On the other hand, the second end portion 27 </ b> C of the rod member 27 is slidably inserted into a hole 26 </ b> A provided in the second plate member 26. Further, in a state where the tip end of the first end portion 27B is in contact with the third plate member 21, the step portion 27D formed between the main body 27A and the second end portion 27C and the second plate member 26 are interposed. Is provided with a minute gap of a distance d. That is, even when the first connecting portion 17 is suddenly rotated in the opening direction, when the coil spring 24 is compressed by the distance d, the stepped portion 27D is engaged with the third plate member 26, and the third plate member 21 is engaged. And the second plate member 26 are rigidly engaged by a rod member 27.

  As described above, also in the second embodiment, substantially the same effect as that of the first embodiment can be obtained. In the second embodiment, the rod member is provided with a first end portion having an outer diameter larger than that of the main body and a second end portion having an outer diameter smaller than that of the main body. The first end portion is engaged with the coil spring 24. Thus, the structure is not limited to the present embodiment as long as the biasing force can be applied.

  Next, a valve shaft coupling mechanism according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged view of a part of the valve shaft coupling mechanism of the third embodiment. The configuration of the valve shaft coupling mechanism of the third embodiment is substantially the same as that of the first embodiment except for the configuration related to the first adjustment screw. The same reference numerals are used for the same configurations as those in the first embodiment, and the description thereof is omitted.

  In the third embodiment, a stopper (second engagement member) 28 is used instead of the second adjustment screw 23 of the first embodiment. The stopper 28 is made of a rigid member such as a metal formed into a rod shape, and the second plate member 29 (to the second plate member 20 of the first embodiment) has a tip extending toward the third plate member 21. Corresponding). In a state where the valve opening degree is synchronized, the tip of the stopper 28 is disposed with a minute gap of the distance d from the third plate member 21. On the other hand, the coil spring 24 is interposed between the second plate member 29 and the third plate member 21 so as to wind around the stopper 28, and the third plate member 21 is directed in the direction of the first adjustment screw 22. Energize. That is, when the coil spring 24 is compressed by the distance d, the third plate member 21 contacts the tip of the stopper 28, and the third plate member 21 and the second plate member 29 are rigidly engaged.

  As described above, the configuration of the third embodiment can provide substantially the same effect as that of the first embodiment. In this embodiment, the stopper is formed integrally with the second plate member. However, the stopper may be formed separately from the second plate member and attached to the second plate member using a predetermined fixing means. Is possible.

  Next, a valve shaft coupling mechanism according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged view of a part of the valve shaft coupling mechanism of the fourth embodiment. The configuration of the valve shaft coupling mechanism of the fourth embodiment is substantially the same as that of the first embodiment except for the configuration related to the first adjustment screw. The same reference numerals are used for the same configurations as those in the first embodiment, and the description thereof is omitted.

  In the fourth embodiment, the coil spring 30 is compressed between the second plate member 31 (corresponding to the second plate member 20 of the first embodiment) and the third plate member 21 as in the first embodiment. In the fourth embodiment, the coil spring 30 is used as a rigid member instead of the second adjustment screw 23 of the first embodiment. That is, in the fourth embodiment, the coil spring 30 functions as an elastic member until it is compressed by a certain minute distance d, but when the distance d is compressed, adjacent windings are brought into close contact with each other and function as a rigid member. . Therefore, in the coil spring 30 of the fourth embodiment, when the number of turns is N, the lead of the winding is L, and the diameter of the winding is D, there is a relationship of d = N × (LD) between them. It is filled. A state when adjacent windings are in close contact with each other is shown as a coil spring 30 'in FIG.

  As described above, substantially the same effect as that of the first embodiment can be obtained by the configuration of the fourth embodiment.

  In the second to fourth embodiments, only the closed rigid valve shaft coupling mechanism has been described. Needless to say, the present invention can be applied to an open rigid valve shaft coupling mechanism as in the first embodiment.

It is a sectional side view of the valve shaft connection mechanism which is 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of a throttle body taken along line II-II in FIG. 1 and a cross-sectional view of a valve shaft coupling mechanism taken along line II′-II ′ in FIG. 1. It is the elements on larger scale of the valve shaft connection mechanism of 2nd Embodiment. It is the elements on larger scale of the valve shaft connection mechanism of 3rd Embodiment. It is the elements on larger scale of the valve shaft connection mechanism of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Valve shaft connection mechanism 12 1st valve shaft 14 2nd valve shaft 17 1st connection part 18 2nd connection part 19 1st board member 20, 26, 29, 31 2nd board member 21 3rd board member 22 1st adjustment Screw (first engaging member)
23 Second adjusting screw (second engaging member)
24, 30 Coil spring (elastic biasing means)
30 'compressed coil spring 30 (second engaging member)

Claims (8)

In a multiple throttle, a valve shaft coupling mechanism that couples two valve shafts and is used to synchronize valve opening,
A first connecting member that includes a first plate member and a second plate member that are disposed opposite to each other, and that is connected to the first valve shaft;
A second valve shaft is connected to the second valve shaft, disposed between the first and second plate members, and engaged with the first connecting portion to transmit rotation of the first valve shaft to the second valve shaft. Two connecting parts;
The second valve shaft is fixed to the first plate member and is rigidly engaged with the second connecting portion and presses the second connecting portion when the first valve shaft rotates in the first direction. A first engaging member that rotates the first member in the first direction;
Elastic biasing means interposed between the second plate member and the second connecting portion, and elastically biasing the second connecting portion toward the first engaging member;
When the first valve shaft is rotated in the second direction and the elastic biasing means is compressed by a predetermined amount, the second plate member and the second connecting portion are engaged with each other rigidly, and the second connecting portion is A valve shaft coupling mechanism comprising: a second engagement member that rotates in the second direction.   The position where the first engagement member is fixed to the first plate member can be adjusted within a range until the second connecting portion compresses the elastic biasing means by the predetermined amount. 2. The valve shaft coupling mechanism according to 1.   2. The valve shaft coupling mechanism according to claim 1, wherein the first engagement member is a first adjustment screw that is screwed onto the first plate member.   The valve shaft coupling mechanism according to claim 1, wherein the elastic biasing means is a coil spring.   The valve shaft coupling mechanism according to claim 4, wherein the coil spring functions as the second engagement member when adjacent windings of the coil spring are in close contact with each other.   The second engagement member is formed of a rigid member fixed to the second plate member, and a gap is provided in a range of the predetermined amount between a tip end of the second engagement member and the second connecting portion. The valve shaft coupling mechanism according to claim 1, wherein the valve shaft coupling mechanism is provided.   The said 2nd engagement member is a 2nd adjustment screw screwed by the said 2nd board member, The width | variety of the said clearance gap can be adjusted with the said 2nd adjustment screw. Valve shaft coupling mechanism.   The second engagement member is formed of a rigid member interposed between the second plate member and the second connecting portion, and the tip of the second engagement member is moved by the elastic biasing unit. The second engagement member abuts against the second plate member when the elastic biasing means is compressed by the predetermined amount while abutting on the second connection portion, and between the second connection portion and the second plate member. The valve shaft coupling mechanism according to claim 1, wherein the gap is engaged with a rigid portion.

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