JP4236046B2 - Structure and method for adjusting air flow rate when throttle valve is fully closed - Google Patents

Description

  The present invention relates to a structure and method for adjusting the flow rate of air when a throttle valve that fully adjusts the amount of intake air supplied to an engine body is closed.

  The conventional method for adjusting the air flow rate when the throttle valve is fully closed is to bring the stopper arm provided at the end of the shaft with the butterfly valve into contact with the stopper screw, and adjust the stopper screw position to adjust the position of the butterfly valve and body when fully closed. The size of the gap between them is adjusted. Furthermore, when a small amount of flow control at the time of full closure is necessary, a method of adjusting the flow rate by applying a coating material such as molybdenum to the facing portion between the body and the butterfly valve is employed.

  In the case of a multiple throttle device, it is necessary to suppress variations in the air amount between cylinders in order to stabilize combustion. However, since the butterfly valve of each throttle is connected to one connecting shaft and the clearance between the body and the butterfly valve cannot be adjusted in each throttle, a bypass passage is provided in each throttle, and air is supplied by a variable orifice provided in the bypass passage. Is adjusted (for example, refer to Patent Document 1).

Japanese Patent Application Laid-Open No. 64-15442 (pages 1 to 3 and FIGS. 1 to 3)

  In the conventional adjustment method in which a coating agent such as molybdenum is applied to the gap between the butterfly valve and the body, there are problems that it is difficult to adjust the flow rate and that durability and reliability are low.

  In the case of a multiple throttle device, since the butterfly valve of each throttle is connected to one connecting shaft, a method of adjusting using a stopper arm and a stopper screw cannot be adopted. Therefore, each throttle is provided with a bypass passage, and a variable orifice that is easy to adjust is provided in the bypass passage and adjusted individually. However, this method requires that a complicated bypass passage be formed in the body, which reduces the cost of materials and processing. There is a problem that it takes a large shape.

  In addition, the butterfly valve is slightly opened to allow only a small amount of air necessary for idle rotation, but in a multiple throttle device, the shaft connects each throttle valve and drives each butterfly valve at the same time. If there is a difference in the flow rate in the initial fully closed state where the motor is not energized, the combustion will be unbalanced for each cylinder due to the difference in the air flow rate even in the idle rotation state, resulting in an engine malfunction such as incomplete combustion or exhaust gas failure. Connected.

  The present invention has been made to solve the above-described problems, is low in cost, and adjusts the gap between the butterfly valve and the body with a simple screw operation, thereby reducing the air flow rate when the throttle valve is fully closed. An object of the present invention is to provide a structure and method for adjusting the air flow rate when the throttle valve to be adjusted is fully closed.

This air flow regulating structure of the throttle valve is fully closed to the invention, the butterfly valve which rotates being supported on the shaft in the body, the throttle valve fully closed secured to the shaft by a fixing device having a screw screwed into the shaft In the air flow rate adjusting structure at the time, a first working portion provided on the shaft, extending in the axial direction of the shaft and contacting the first main surface of the butterfly valve, and provided on the fixing device, on the second main surface of the butterfly valve The second action part and the third action part are in contact with each other. The second action part and the third action part are perpendicular to the axis of the shaft with respect to the first action part , and the first action part is interposed between the second action part and the third action part. sandwiched therebetween is provided at a position spaced in opposite directions, the third working section is obtained by advancing and retracting with respect to the shaft by screwing adjustment of screw fixture means, a butterfly in cooperation with the second acting portion Valve And pressed against the first working part, in which is configured so as to deform bent around the first acting portion.

The throttle valve is fully closed the air flow adjustment method according to the invention, the butterfly valve which rotates being supported on the shaft in the body, the throttle valve fully closed secured to the shaft by a fixing device having a screw screwed into the shaft In the air flow rate adjustment method at the time, the butterfly valve is held between at least three working parts between the shaft and the fixing device, and by adjusting the screwing of the screw of the fixing device, one of the three working parts is When the butterfly valve is bent by moving it over the plane passing through the working part extending in the axial direction of the shaft and the remaining working part of the fixing device, the gap between the butterfly valve and the body is adjusted to be fully closed. The air flow rate is adjusted.

  According to the structure and method for adjusting the air flow rate when the throttle valve is fully closed, the gap between the butterfly valve and the body can be adjusted by bending and deforming the butterfly valve using the screws of the fixing device. When fully closed, the flow rate of the air flowing through the gap between the butterfly valve and the body can be easily adjusted.

Embodiment 1 FIG.
1 and 2 are views showing an external appearance of a multiple throttle device using an air flow rate adjusting structure when the throttle valve is fully closed according to Embodiment 1 of the present invention. FIG. A section is shown in an exploded state. In this description, a double throttle device is taken as an example. However, the air flow rate adjusting structure when the throttle valve is fully closed according to the present invention is used for a single throttle valve or a multiple throttle device such as a triple throttle or a quadruple. May be.

In FIG. 1, a multiple throttle device 1 includes two throttle valves 2 and is configured in the same manner as a known one except for the air flow rate adjusting structure when the throttle valve is fully closed according to the present invention. 1 and 2, the multiple throttle device 1 includes a driving device such as a motor and a speed reducer (not shown) incorporated in a structure integrated with the body 3 in order to drive the throttle valve 2. ing. The rotation of the driving device is transmitted to the shaft 4 to rotate the butterfly valve 5 attached to the shaft 4. The butterfly valve 5 is directly fixed to the shaft 4 by a fixing device 8 having a screw 6 screwed to the shaft 4 and a holding member 7 fixed by the screw 6. And rotate within the body 3. When the butterfly valve 5 rotates in the direction of arrow C in FIG. 2, the gaps E ₁ and E ₂ between the butterfly valve 5 and the body 3 become large, and the throttle valve 2 opens, and when it rotates in the direction of arrow D, the gap E ₁ and E ₂ become smaller and the throttle valve 2 is closed. The air flow rate adjusting structure when the throttle valve is fully closed according to the present invention is a structure for appropriately adjusting the size of the gap when the throttle valve 2 is fully closed.

  The butterfly valve 5 is a plate member made of, for example, duralumin having a substantially circular shape and low rigidity. The butterfly valve 5 has a first main surface 9 supported by the shaft 4 and a second main surface 10 opposite to the first main surface 9. Holes 11 are provided. The butterfly valve 5 itself may be a known one.

  The shaft 4 of the throttle valve 2 is made of, for example, stainless steel having high rigidity. The shaft 4 is substantially semicircular in cross section at the portion where the butterfly valve 5 is mounted, and has an outer peripheral cylindrical surface 12 and a flat, substantially rectangular butterfly valve mounting plane 13 between which a corner or ridge 14 is formed. Yes. A screw hole 15 is provided in the butterfly valve mounting plane 13 so that the screw 6 of the fixing device 8 can be received. At least a portion of the butterfly valve mounting plane 13 acts on and holds the butterfly valve 5, so that the first action extends in the axial direction of the shaft 4 and abuts against the first main surface 9 of the butterfly valve 5. Part F.

  A holding member 7 of the fixing device 8 is provided on the second main surface 10 of the butterfly valve 5, and the holding member 7 is screwed into the shaft 4 through the through hole 16 and adjusted with respect to the shaft 4. The butterfly valve 5 is fixed to the shaft 4 by pressing the second main surface 10 of the butterfly valve 5 with a screw 6 that can move forward and backward. The holding member 7 has a first pressing portion 17 that is provided around the through hole 16 and presses the butterfly valve 5. In this example, the pressing portion 17 is dimensioned so as not to protrude from the butterfly valve mounting plane 13 of the shaft 4, and the outer edge portion is inside the ridge line 14 of the shaft 4. When the holding member 7 is attached to the shaft 4 with the screw 6, the holding member 7 acts on and holds the butterfly valve 5 in at least a part of the pressing portion 17. The second action part G is provided in the fixing device 8 and contacts the second main surface 10 of the butterfly valve 5.

  The holding member 7 also includes an arm portion 18 that extends from the first pressing portion 17 in a direction perpendicular to the axial center of the shaft 4. A second pressing portion 19 provided at a position close to the shaft 4 side by a distance L is provided. This 2nd press part 19 will press the 2nd main surface 10 of the butterfly valve 5 in the position mutually spaced apart with the 1st press part 17, if the screw | thread 6 is tightened and it advances toward the shaft 4. As shown in FIG. At least a part of the second pressing portion 19 is a third action portion H that is provided in the fixing device 8 and contacts the second main surface of the butterfly valve 5. The second action part G and the third action part H are provided at positions separated from the first action part F in a direction perpendicular to the axis of the shaft 4 and in directions opposite to each other. The direction of the force acting on the first action part F is opposite to the direction of the force acting on the second and third action parts G and H.

  In the state where the butterfly valve 5 is attached to the shaft 4 in this way, the first main surface 9 of the butterfly valve 5 is from the first action portion F to the second action portion which is the ridge line 14 of the butterfly valve attachment plane 13 on the shaft 4. An acting force in the opposite direction (rightward in FIG. 2) is received at a position between G and the third acting part H. For this reason, the butterfly valve 5 is fixedly supported on the shaft 4 by the first, second and third action portions F, G and H. When the screw 6 is tightened and further advanced toward the shaft 4, the third action part H presses the second main surface 10 of the butterfly valve 5 supported in contact with the first action part F and the second action part G. The butterfly valve 5 is configured to bend and deform at the position of the first action portion F.

In such an air flow rate adjustment structure when the throttle valve is fully closed, when the butterfly valve 5 is attached to the shaft 4 by tightening the screw 6 with an appropriate strength, the butterfly valve 5 is held flat without being bent. It can be supported between the member 7. When the screw 6 is tightened and moved forward with respect to the shaft 4, the butterfly valve 5 has a second action part G on the first pressing part 17 of the holding member 7 and a first action part F on the butterfly valve mounting plane 13 of the shaft 4. At the same time, the third action part H on the second pressing part 19 of the holding member 7 strongly presses the butterfly valve 5 in the left direction in the drawing. The position of the third action part H is a position that is separated from the first action part F in the direction perpendicular to the axis of the shaft 4 in the direction opposite to the second action part G, and the shaft 4 rather than the third action part H. Therefore, the butterfly valve 5 can be bent and deformed in the direction of the arrow D around the first action part F. By such deformation, the gap E ₁ between the butterfly valve 5 and the body 3 can be reduced, and the size of the bending deformation, that is, the size of the gap E ₁ can be arbitrarily adjusted by adjusting the screw 6. be able to.

  Thus, by bending the butterfly valve 5, the flow rate of air flowing through the gap between the butterfly valve 5 and the body 3 can be reduced when the throttle valve 2 is fully closed. Here, the air flow rate can be finely adjusted by finely adjusting the tightening degree of the screw 6. In addition, since the butterfly valve 5 is bent and deformed to adjust the flow rate of air, the number of additional parts is small without greatly changing the structure. Further, in the multiple throttle device 1, by adjusting the throttle valve 2 individually, it is possible to reduce the variation in the air flow rate between the throttles.

  In FIG. 2, the holding member 7 is connected upside down to bend and deform the butterfly valve 5 in the direction of the arrow C, thereby increasing the clearance between the butterfly valve 5 and the body 3, and It is also possible to increase the air flow rate when closed. In this description, the shaft 4 is configured to receive the screw 6, but the holding member 7 may be configured to receive the screw.

Embodiment 2. FIG.
FIG. 3 is an exploded sectional view showing an air flow rate adjusting structure when the throttle valve is fully closed according to Embodiment 2 of the present invention. In FIG. 3, the configurations of the throttle valve and the butterfly valve are the same as those of the first embodiment shown in FIGS.

The shaft 4 of the throttle valve 2 is made of, for example, stainless steel having high rigidity. The shaft 4 has a shape in which a cross section is recessed from a semicircle at a portion where the butterfly valve 5 is attached, and includes an outer peripheral cylindrical surface 12 and two butterfly valve mounting planes 20 which are substantially rectangular and contact each other at an angle θ _1. The ridgeline 14 is formed at both ends of the outer peripheral cylindrical surface 12. A threaded hole 21 is provided in an intersecting portion of the two butterfly valve mounting planes 20 so that the screw 6 of the fixing device 8 can be received. Since the two ridge lines 14 of the shaft 4 abut on the first main surface of the butterfly valve 5 and hold it, they are the first action portions F ₁ and F ₂ , respectively.

The holding member 7 of the fixing device 8 is provided on the second main surface 10 of the butterfly valve 5 with the same configuration as in the first embodiment, and the fixing device 8 is a part of the first pressing portion 17 of the holding member 7. There are provided second action parts G ₁ and G ₂ and a third action part H which is a part of the second pressing part 19 provided at the tip of the arm part 18 of the holding member 7.

In the state in which the butterfly valve 5 is attached to the shaft 4 in this way, the first main surface 9 of the butterfly valve 5 is _second from the first action portions F ₁ and F ₂ that are two ridge lines 14 on the shaft 4. The main surface 10 receives acting forces in the opposite directions from the second acting portions G ₁ and G ₂ and the third acting portion H of the holding member 7 alternately. For this reason, the butterfly valve 5 is fixedly supported on the shaft 4 at these five locations of the first, second and third action portions F, G and H. When the screw 6 is tightened and further advanced toward the shaft 4, the third action part H moves the second main surface 10 of the butterfly valve 5 supported in contact with the first action part F ₁ and the second action part G _1. pressed by bending deformation butterfly valve 5 in a first position of the working portion F _1, further of the second acting portion G ₁ and G ₂ butterfly valve 5 sandwiched between the first operation portions F ₁ and F ₂ second The main surface 10 is pressed so that the butterfly valve 5 is bent and deformed at the positions of the second action portions G ₁ and G ₂ .

In such an air flow rate adjustment structure when the throttle valve is fully closed, when the butterfly valve 5 is attached to the shaft 4 by tightening the screw 6 with an appropriate strength, the butterfly valve 5 is held flat without being bent. It can be supported between the member 7. When the screw 6 is tightened and advanced with respect to the shaft 4, the butterfly valve 5 can be bent and deformed in the direction of the arrow D around the first action portion F1 as in the _first embodiment. At the same time, since the butterfly valve 5 is tightened between the second acting portions G ₁ and G ₂ located therebetween and the first acting portion F ₁ and F _2, the butterfly valve 5 and the second acting portion G ₁ and Even at the position of G ₂ , it is bent and deformed in the direction of the arrow D into a substantially square shape. By such a deformation, the gaps E ₁ and E ₂ between the butterfly valve 5 and the body 3 can be reduced, and the magnitude of the bending deformation, that is, the magnitude of the gaps E ₁ and E ₂ is determined by the screwing of the screw 6. It can be arbitrarily adjusted by adjustment.

  Thus, the flow rate of the air flowing through the gap between the butterfly valve 5 and the body 3 can be reduced as in the first embodiment, but in this example, the screw tightening degree is the same as in the first embodiment. But it can make a big change.

Embodiment 3 FIG.
4 is a cross-sectional view showing an air flow rate adjusting structure when the throttle valve is fully closed according to Embodiment 3 of the present invention, and shows a state in which the BB cross section of the throttle valve 2 of FIG. 1 is disassembled. 4, the structure is the same as that of the second embodiment shown in FIG. 3 except that the holding member 7 is disposed upside down from FIG.

  In such an air flow rate adjusting structure when the throttle valve is fully closed, the air flow rate can be changed in the direction opposite to the change in the second embodiment by tightening a screw.

Embodiment 4 FIG.
FIG. 5 is an exploded sectional view showing an air flow rate adjusting structure when the throttle valve is fully closed according to Embodiment 4 of the present invention. In FIG. 5, the butterfly valve 5 is fixed to the shaft 4 by a fixing device 8 including a screw 22 screwed and fixed to the shaft 4 and a screw 23 screwed to the shaft 4 and adjusting a bending amount. The other configuration is the same as that of the first embodiment shown in FIGS.

  The butterfly valve 5 may be a known one except that it includes a screw 22 that is screwed and fixed to the shaft 4 and a hole 24 that is screwed to the shaft 4 and passes through a screw 23 that adjusts the amount of bending.

The shaft 4 of the throttle valve 2 is made of, for example, stainless steel having high rigidity. The shaft 4 has a fan-shaped section with a cross section cut off by an acute angle θ ₂ minutes from the center of the semicircle at the portion where the butterfly valve 5 is attached, and two butterfly valve mounting planes that are substantially rectangular and intersect at an outer angle of θ _2. 25, and a ridge line 14 is formed at a portion where the two butterfly valve mounting planes 25 intersect. Further, the two butterfly valve mounting planes 25 are respectively provided with screw holes 26 in the same direction with respect to the direction perpendicular to one butterfly valve mounting plane 25 and are screwed to the shaft 4 of the fixing device 8. Thus, the screw 22 to be fixed and the screw 23 to be screwed to the shaft 4 to adjust the bending amount can be received. The ridge line 14 of the shaft 4 is in contact with the first main surface of the butterfly valve 5 and holds it, so that it is the first action portion F.

  On the second main surface 10 of the butterfly valve 5, a screw 22 that is screwed and fixed to the shaft 4 constituting the fixing device 8 is provided. The screw 22 screwed and fixed to the shaft 4 passes through the hole 24 provided in the butterfly valve 5 through the screw hole 26 provided perpendicular to the plane of the shaft 4, and the second main surface of the butterfly valve 5. 10 is pressed to fix the butterfly valve 5 to the shaft 4. Since this portion acts on and holds the butterfly valve 5, it is the second action portion G that contacts the second main surface 10.

  Further, on the second main surface 10 of the butterfly valve 5 on the opposite side to the first action part F of the second action part G, the bending amount is adjusted by screwing with the shaft 4 constituting the fixing device 8. A screw 23 is provided. A screw 23 that is screwed into the shaft 4 to adjust the amount of bending passes through a hole 24 provided in the butterfly valve 5 in a screw hole 26 provided in a direction not perpendicular to the plane of the shaft 4, and passes through the hole 24 provided in the butterfly valve 5. The butterfly valve 5 is fixed to the shaft 4 by pressing the second main surface 10. This part is separated from the second action part G and presses the second main surface 10 of the butterfly valve 5, is perpendicular to the axis of the shaft 4 with respect to the first action part F, and the second action part G Since it is spaced apart in the opposite direction, it is the third action part H.

  In this state where the butterfly valve 5 is attached to the shaft 4, the first main surface 9 of the butterfly valve 5 is a ridge line 14 formed at a portion where the two butterfly valve attachment planes 25 on the shaft 4 intersect. The acting force in the opposite direction is received from the first acting part F at a position between the second acting part G and the third acting part H. For this reason, the butterfly valve 5 is fixedly supported on the shaft 4 by the first, second and third action portions F, G and H. When the screw 23 for adjusting the bending amount is tightened and further advanced toward the shaft 4, the third action part H comes into contact with the first action part F and the second action part G and is supported by the second main part of the butterfly valve 5. The butterfly valve 5 is configured to bend and deform at the position of the first action portion F by pressing the surface 10.

In such an air flow rate adjusting structure when the throttle valve is fully closed, when the butterfly valve 5 is attached to the shaft 4 by tightening the screw 23 for adjusting the bending amount with an appropriate strength, the butterfly valve 5 remains flat without being bent. Thus, it can be supported between the shaft 4 and the holding member 7. When the screw 23 for adjusting the amount of bending is tightened and advanced with respect to the shaft 4, the butterfly valve 5 is formed tangent to the second acting part G of the holding member 7 and the two butterfly valve mounting planes 25 on the shaft 4. The third action part H strongly presses the butterfly valve 5 in the left direction in the drawing at the same time as it is strongly tightened between the first action part F that is the ridge line 14. The position of the third action part H is a position separated from the first action part F in the direction perpendicular to the axis of the shaft 4 in the direction opposite to the second action part G, and the butterfly valve 5 is connected to the first action part F. It can be bent and deformed in the direction of arrow D around. By such deformation, the gap E ₁ between the butterfly valve 5 and the body 3 can be reduced, and the size of the bending deformation, that is, the size of the gap E ₁ is adjusted by screwing of the screw 23 for adjusting the amount of bending. Can be adjusted arbitrarily.

  According to such a configuration, since the fixing screw 22 and the adjusting screw 23 are separately provided, fine adjustment can be performed while the butterfly valve 5 is stably secured. Further, there is no need to use a special member, and the structure is simple.

In FIG. 5, when the lower part of the shaft 4 is missing rather than the upper part of the shaft 4, the lower part of the butterfly valve 5 is fixed to the shaft 4 with a screw 22 for fixing the butterfly valve 5 to the upper part. By bending using the screw 23 that adjusts the amount of bending, the clearance E ₂ between the butterfly valve 5 and the body 3 can be adjusted in a larger direction.

It is a whole external view which shows the air flow rate adjustment structure at the time of throttle valve full closure which is Embodiment 1 of this invention. It is a figure which decomposes | disassembles and shows the AA cross section of the throttle valve of FIG. 1 which is Embodiment 1 of this invention. It is a figure which decomposes | disassembles and shows the cross section which shows the air flow rate adjustment structure at the time of another throttle valve fully closed which is Embodiment 2 of this invention. It is a figure which decomposes | disassembles and shows the BB cross section of the throttle valve of FIG. 1 which is Embodiment 3 of this invention. It is a figure which decomposes | disassembles and shows the cross section which shows the air flow rate adjustment structure at the time of another throttle valve fully closed which is Embodiment 4 of this invention.

Explanation of symbols

  2 throttle valve, 3 body, 4 shaft, 5 butterfly valve, 6, 22, 23 screw, 7 holding member, 8 fixing device, 9 first main surface, 10 second main surface, 12 outer peripheral cylindrical surface, 13, 20, 25 Butterfly valve mounting plane, 14 ridgeline, F first action part, G second action part, H third action part.

Claims (6)

In the air flow rate adjustment structure when the throttle valve is fully closed, the butterfly valve that is supported by the shaft and rotates in the body is fixed to the shaft by a fixing device having a screw that is screwed to the shaft .
A first action portion provided on the shaft, extending in an axial direction of the shaft and contacting the first main surface of the butterfly valve;
A second action part and a third action part provided in the fixing device and contacting the second main surface of the butterfly valve;
The second action part and the third action part are provided at positions separated from each other in a direction perpendicular to the axis of the shaft with respect to the first action part and in opposite directions with the first action part interposed therebetween. And
The third action part can be moved forward and backward with respect to the shaft by adjusting the screwing of the screw of the fixing device, and the butterfly valve is moved with respect to the first action part in cooperation with the second action part. An air flow rate adjusting structure when the throttle valve is fully closed, which is configured to be pressed and bend-deformed about the first action portion .   The fixing device has the second action part and the third action part, and a holding member that contacts the butterfly valve at the second action part and the third action part, and the holding member is adjusted to the shaft The air flow rate adjusting structure when the throttle valve is fully closed according to claim 1, further comprising a screw that can be fixed.   The said 1st action part of the said shaft is a ridgeline between the single butterfly valve attachment plane provided in the said shaft, and a shaft outer peripheral cylindrical surface, Either of Claim 1 or Claim 2 characterized by the above-mentioned. The air flow rate adjustment structure when the throttle valve is fully closed as described in 1. Said anchoring device includes a first screw having a second acting portion on reporting, the throttle valve fully closed according to claim 1 wherein the third and a second screw having a working portion Air flow adjustment structure at the time. The said 1st effect | action part of the said shaft is a convex bending part between the two butterfly valve attachment planes which were provided in the said shaft and were connected with an angle mutually, The claim 1 characterized by the above-mentioned. The air flow rate adjusting structure when the throttle valve is fully closed according to any one of claims 2 and 4. In the air flow rate adjustment method when the throttle valve is fully closed, the butterfly valve that is supported by the shaft and rotates in the body is fixed to the shaft by a fixing device having a screw that is screwed to the shaft .
Holding the butterfly valve between at least three working parts between the shaft and the anchoring device;
By adjusting the screwing of the screw of the fixing device, one of the three operating portions is moved beyond the plane passing through the operating portion extending in the axial direction of the shaft and the remaining operating portion of the fixing device. And adjusting the air flow rate when the throttle valve is fully closed by bending the butterfly valve and adjusting the clearance between the butterfly valve and the body. .

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