JPH0720471U - Flow control valve - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a valve structure capable of varying from a large flow rate to a small flow rate with one drive system and capable of fine adjustment. [Structure] A small valve element is arranged on a drive shaft, and a large valve element is arranged on a driven shaft that is driven and rotated by the drive shaft. Performs control with a large flow rate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel control valve used in an internal combustion engine or the like, and more particularly to a structure of a flow control valve capable of finely adjusting the opening degree.

[0002]

[Prior art]

 In order to adjust the flow rate of the fuel mixture air sent to the internal combustion engine, the idle speed control (hereinafter referred to as ISC control), which requires a precise control with a small flow rate, such as when idling, and the flow rate as when running. There are many traveling controls that require a wide flow rate adjustment range, and a valve structure suitable for each is required.

FIG. 4 is a sectional view showing the structure of a conventional flow rate control system and a flow rate adjusting valve. Reference numeral 15 denotes a thick passage for traveling control, which is provided with a flow control valve 16 for traveling control. Reference numeral 25 denotes a narrow flow path for ISC control, which is provided with a flow rate adjusting valve 26 for ISC control. . Numerals 17 and 27 are shafts for adjusting the angles of the valve bodies for traveling control and ISC control, respectively, and are driven by step motors (not shown) for ISC control and traveling control, respectively. Numerals 18 and 28 are valve bodies arranged on the shafts 17 and 27, and the degree of opening of the flow paths 15 and 25 is adjusted by rotating the shafts 17 and 27. The flow rate is adjusted by controlling the shaft 17 during traveling and by controlling the shaft 27 during ISC control.

[0004]

[Problems to be solved by the device]

 In the flow rate control method of FIG. 4 described above, the flow path is divided into two, a thick flow path 15 and a thin flow path 25, and the thick flow path 15 is provided with a travel adjusting valve 16 and the thin flow path 25 is provided with an ISC adjusting valve. It is provided with 26 and can be controlled separately. However, this method has a drawback in that it is necessary to branch the flow path into two and two drive systems such as a motor are required, which increases the cost.

As another method, a method of adjusting the flow rate with one valve in one flow path has been proposed, but the minimum adjustable amount of flow rate (referred to as resolution) is the resolution of the valve axis (control mechanism). , Which is determined by the accuracy of the valve structure), is proportional to the cross-sectional area of the flow path. Therefore, in order to make fine adjustments such as ISC control with a single large valve, a more advanced control mechanism and valve Accuracy is required, and even if it can be realized, the cost will increase significantly.

Therefore, an object of the present invention is to provide a structure of a valve which has one flow passage and one drive system, has a wide flow rate adjustment range, and is highly accurate.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a body in which a flow path is formed and a valve body axially supported by the body, and the valve body rotates about an axis to In a flow rate control valve whose opening degree is adjusted, a drive shaft connected to a drive means for rotating the shaft, and a driven shaft that engages with the drive shaft when the drive shaft rotates by a predetermined rotation angle or more and rotates with the drive shaft. A shaft, a drive shaft valve body connected to the drive shaft, and a driven shaft valve body connected to the driven shaft.

[0008]

[Action]

 According to the present invention, the flow rate adjustment that requires a small amount of flow rate but requires precision is performed by the drive shaft connected to the control system by sharing the valve element with a small opening area. On the other hand, a wide flow rate adjustment is performed by a driven shaft that is shared by a valve body having a large opening area and is engaged with a drive shaft. It should be noted that both valves are automatically closed by a spring force or the like when the driving force is released as in the conventional valve.

[0009]

【Example】

 FIG. 1 is a sectional view showing the structure of a flow control valve according to the present invention. Reference numeral 4 is a body forming a flow path 5 for vaporized fuel air. Reference numeral 11 denotes a first shaft (hereinafter referred to as a drive shaft) provided on the body 4, which is driven by a step motor or the like (not shown). Reference numeral 21 is a driven shaft having a common axis with the drive shaft 11. Reference numeral 12 denotes a small disk-shaped ISC control valve element that is axially supported by the drive shaft 11, and performs a small flow rate adjustment for ISC control with a small flow rate. Reference numeral 22 denotes a large donut-shaped travel control valve element provided on the driven shaft 21 for adjusting the flow rate for travel control with a large flow rate. 13 is a protrusion provided on the drive shaft 11, and 23 is a protrusion provided on the driven shaft 21. The protrusion 13 is provided at a position 90 ° behind the protrusion 23 with respect to the rotational direction of the drive shaft. There is. Further, the rotation of the drive shaft 11 causes the projection 13 to engage with the projection 23 on the side of the driven shaft 21 to open and close the travel control valve element 22 on the side of the driven shaft 21.

FIG. 2 is a view for explaining the operating mechanism of the flow rate adjusting valve according to the present invention. If the rotation angle of the drive shaft 11 is 0 ° (here, the reference of the rotation angle is the rotation angle 0 ° when the ISC control valve is closed. The installed ISC control valve body 12 is closed. Further, the protrusion 23 of the driven shaft 21 is not engaged with the protrusion 13 of the drive shaft 11, so that the driven shaft 21 is not rotated and the travel control valve element 22 disposed on the driven shaft 21 is also closed. (However, a small amount of offset flow is flowing).

When the rotation angle of the drive shaft 11 is 45 ° (the state in FIG. 2), the ISC control valve body 12 arranged on the drive shaft 11 is opened at 45 °. On the other hand, the protrusion 23 of the driven shaft 21 is not engaged with the protrusion 13 of the drive shaft 11, so that the driven shaft 21 is not rotated and the travel control valve body 22 disposed on the driven shaft 21 is closed. . When the rotation angle of the drive shaft 11 is 90 ° (state in FIG. 2), the ISC control valve body 12 arranged on the drive shaft 11 is fully opened. However, even if the protrusions 23 of the driven shaft 21 come into contact with the protrusions 13 of the drive shaft 11, the driven shaft 21 is not rotated, and the travel control valve body 22 arranged on the driven shaft 21 is closed. The range in which the angle of the drive shaft 11 is 0 ° to 90 ° is a control region by the ISC control valve body 12 (small valve), and is a region in which the flow rate is small but fine adjustment is possible as shown in FIG. .

When the rotation angle of the drive shaft 11 is 135 ° (the state in FIG. 2), the ISC control valve body 12 arranged on the drive shaft 11 is opened 90 °. On the other hand, the protrusion 23 of the driven shaft 21 is engaged with the protrusion 13 of the drive shaft 11, the driven shaft 21 is rotated by 45 °, and the travel control valve body 22 disposed on the driven shaft 21 is opened by 45 °. When the rotation angle of the drive shaft 11 is 180 ° (state in FIG. 2), the ISC control valve body 12 arranged on the drive shaft 11 is opened 90 °. On the other hand, the protrusion 23 of the driven shaft 21 is engaged with the protrusion 13 of the drive shaft 11, the driven shaft 21 is rotated 90 °, and the travel control valve element 22 disposed on the driven shaft 21 is fully opened. The range in which the angle of the drive shaft 11 is 90 ° to 180 ° is the control region by the travel control valve body 22 (large valve), and the accuracy is slightly inferior because the cross-sectional area of the flow passage is large as shown in FIG. However, this is an area where large flow rate adjustment is possible.

When the flow rate decreases, the rotation angle of the drive shaft 11 becomes smaller, but in the range from state to, only the drive shaft 12 is returned by the step motor or the like, and the driven shaft 21 is separated like the general valve. It is returned by the provided spring force. Further, in the present embodiment, the delay angle of the protrusion 13 of the drive shaft 11 with respect to the protrusion 23 of the driven shaft 21 is 90 °. This is because the control resolutions of the ISC control region and the travel control region are equalized. If you want to increase the control resolution of, you can increase the angle of the control area.

FIG. 3 is a plan view showing the structure of a flow rate adjusting valve according to another embodiment of the present invention. The structure of this flow rate adjusting valve is different from that of the flow rate adjusting valve of the above-described embodiment in the valve body. That is, in the above embodiment, the valve body was divided into concentric circles with respect to the flow path, and the small disk-shaped valve body was assigned the ISC control, and the large donut-shaped valve element was assigned the travel control. In the example, the valve element is divided into a small valve element and a large valve element perpendicular to the axis of the flow path, and the small valve element is responsible for ISC control and the large valve element is responsible for running control.

Reference numeral 4 denotes a body forming a flow path 5 for vaporized fuel air. Reference numeral 31 denotes a first shaft (hereinafter referred to as a drive shaft) provided on the body 4, which is driven by a step motor or the like (not shown). Reference numeral 41 is a driven shaft having a common axis with the drive shaft 31. Reference numeral 42 is a travel control valve body having a large area supported by the driven shaft 41. Reference numeral 32 is an ISC control valve body having a small area supported by the drive shaft 31. 33 is a protrusion provided on the drive shaft 31, 43 is a protrusion provided on the driven shaft 41, and the protrusion 33 is provided at a position delayed by 90 ° from the protrusion 43 with respect to the rotation direction of the drive shaft. . Further, the rotation of the drive shaft 31 causes the projection 33 to engage with the projection 43 on the driven shaft 41 side to open and close the travel control valve body 42 on the driven shaft 41 side. The operation mechanism is completely the same as that of the above-mentioned embodiment, and therefore its explanation is omitted.

As described above, in the present embodiment, only the control of the drive shafts 11 and 31 can be performed from a range in which fine adjustment of the flow rate is required such as ISC control to a wide range of flow rate variable range such as travel control. It will be possible.

[0017]

[Effect of device]

 As described above, in the present invention, both the fine adjustment of the flow rate and the flow rate adjustment with a wide variable range are achieved by one drive system, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a flow rate adjusting valve according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operating mechanism of a flow rate adjusting valve according to an embodiment of the present invention.

FIG. 3 is a plan view showing the structure of a flow rate control valve of another embodiment according to the present invention.

FIG. 4 is a sectional view showing a structure of a conventional flow rate control system and a flow rate adjusting valve.

[Explanation of symbols]

 11 ... Drive shaft 21 ... Driven shaft 12 ... ISC control valve body 22 ... Travel control valve body 13, 23 ... Protrusion 4 ... Body

Claims (1)

[Scope of utility model registration request] 1. A body having a flow passage, and a valve body axially supported by the body, wherein the valve body rotates about an axis to adjust the opening degree of the flow passage. In the flow rate adjusting valve, a drive shaft connected to drive means for rotating the shaft, a driven shaft that engages with the drive shaft when the drive shaft rotates by a predetermined rotation angle or more, and rotates with the drive shaft, and the drive shaft. A flow rate adjusting valve comprising: a drive shaft valve body connected to the driven shaft valve body; and a driven shaft valve body connected to the driven shaft.