JP2002256899A - Rotary valve structure of throttle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve structure of a throttle control device which eliminates unbalance of a rotary valve torque and can be driven at a low torque by evenly applying an air flow pressure to the whole surface of a rotary valve. SOLUTION: This rotary valve has a bellows mechanism 5 such that the rotary valve 3 itself is accordion-folded around a rotating shaft 4 as a center when operated from a fully closing state to a fully opening condition. The bellows mechanism comprises numerous ribs 6 mounted to the rotating shaft and a sheet material 7 provided so as to cover the ribs. In another embodiment, the rotary valve 3 is composed such that its outer surface forms a semispherical face around the rotating shaft as a center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve (butterfly valve) structure for a throttle control device of an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 4, a rotary valve (butterfly valve) of a conventional throttle control device has a disk-shaped rotary valve 3 rotated on a cylindrical throttle body 1 forming an intake passage 2. As shown in FIG. It is rotatably supported via a shaft 4. For this reason, as shown in the cross-sectional view of FIG. 4, the rotary valve 3 is configured to stop in a state of being inclined with the inner circumference of the intake passage 2 when fully closed, so that the pressure due to the flow of the control air flowing through the throttle control device is reduced. However, the voltage is not applied uniformly over the entire surface of the rotary valve 3, and as a result, torque balance may be lost, and a large torque may be required to control the rotation of the rotary valve.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to uniformly control the pressure caused by the flow of control air applied to the surface of a rotary valve over the entire surface of the rotary valve. An object of the present invention is to provide a rotary valve structure of a throttle control device that can be driven with low torque by eliminating the torque balance of the rotary valve by applying the torque.

[0004]

According to the present invention, there is provided a rotary valve structure of a throttle control device according to the present invention as means for solving the above-mentioned problems. The rotary valve structure of the throttle control device according to claim 1, wherein the rotary valve itself has a bellows mechanism that is folded around a rotary shaft when the rotary valve is operated from a fully closed state to a fully open state. By this, the pressure due to the flow of the control air applied to the rotary valve surface can be evenly applied to the entire rotary valve surface, and the torque balance of the rotary valve can be eliminated. Driving becomes possible.

According to a second aspect of the present invention, the rotary valve structure is characterized in that the bellows mechanism is composed of a number of ribs attached to a rotary shaft and a sheet material covering the ribs. This defines that the shape of the rib is semicircular or angular. The rotary valve structure of claim 4 is
When the bellows mechanism is folded, a flow path penetrating through the inside of the bellows mechanism is formed, whereby the opening area of the rotary valve when the valve is opened can be increased by that amount.

According to a fifth aspect of the present invention, there is provided a rotary valve structure of a throttle control device, wherein the rotary valve has a semi-spherical outer surface around a rotary shaft. The operation and effect of According to a sixth aspect of the present invention, in the rotary valve structure, the hemispherical shape of the outer surface of the rotary valve is configured by a combination of two arc spherical shapes, and the valve body is reduced in a fully opened state of the rotary valve. And the flow resistance can be reduced accordingly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary valve structure of a throttle control device according to an embodiment of the present invention will be described below with reference to the drawings. 1A and 1B show a rotary valve (butterfly valve) according to a first embodiment of the present invention. FIG. 1A shows a fully closed state of the rotary valve, FIG. 1B shows a fully open state of the rotary valve, and FIG. Figure 1
FIG. 3A is a partial sectional view as viewed from A in FIG. The rotary valve 3 is rotatably supported by a throttle body main body 1 forming an intake passage 2 via a rotary shaft 4. Although not shown,
An accelerator lever is attached to one end of a rotating shaft 4 protruding from the outer surface of the throttle body 1,
A return spring is interposed between the accelerator lever and the throttle body 1. Although not shown, a wire connected to the accelerator is wound around the accelerator lever, and the rotary valve 3 opens and closes when the accelerator is depressed.

[0008] In the first embodiment, the rotary valve 3 is
When operating from the fully closed state in FIG. 1A to the fully open state in FIG. 1B, the bellows mechanism 5 is configured so that the rotary valve 3 itself is folded. The bellows mechanism 5 includes a plurality of ribs 6 attached to the rotating shaft 4 and a sheet member 7 covering these ribs 6. The rib 6 is, in the embodiment of FIG.
As shown in (c), it has a square shape, that is, a gate shape, but a semicircular shape and an arch shape can also be adopted. Further, as shown in FIG. 1B, when the rotary valve 3 is fully opened, that is, when the bellows mechanism 5 is folded, an air flow path passing through the bellows mechanism 5 is also formed. Therefore, in the fully opened state, the air flow is prevented from being blocked by the bellows mechanism 5 to a minimum. FIG.
In the fully closed state of the rotary valve shown in (a), that is, in a state where the bellows mechanism 5 is extended, the pressure due to the air flow applied to the surface of the rotary valve 3 can be uniformly received over the entire rotary valve surface, Distortion of torque balance can be eliminated.

FIGS. 2A and 2B show a rotary valve according to a second embodiment of the present invention. FIG. 2A shows a fully closed state of the rotary valve, and FIG.
Shows a fully opened state, and (c) shows a cross-sectional view as viewed from B in FIG. 2 (a). In the second embodiment, the rotary valve 3
Is composed of a hemispherical body 3a whose outer surface has a hemispherical shape toward the upstream with respect to the rotation axis 4. The fully opened state of the rotary valve 3 is as shown in FIG.
(A) is a state in which the rotary valve 3 in the fully closed state is rotated by 90 °. In this case, half of the intake passage 2 is in a closed state, but the inside of the hemispherical body 3a is open.
Some airflow passes inside the rotary valve. Also in the rotary valve 3 of the second embodiment, the pressure due to the flow of the control air applied to the rotary valve surface when fully closed can be uniformly received on the entire rotary valve surface, and the torque balance is not lost. The rotation valve 3 can be driven with low torque.

FIG. 3 shows a rotary valve according to a third embodiment of the present invention. In the third embodiment, the outer surface of the hemispherical shape around the rotation axis 4 of the rotary valve 3 is formed by a combination of two arc-shaped spherical bodies 3b and 3c. In this case, one arc-shaped spherical body 3 b needs to be fixed to the intake passage 2 side, and the other arc-shaped spherical body 3 c needs to be fixed to the rotating shaft 4. FIG. 3A shows the rotary valve 3 in a fully closed state. As the valve moves from the fully closed state to the fully opened state, one of the spherical spherical bodies 3c rotates together with the rotary shaft 4 and the other circular spherical body 3c. 3b, and the rotary valve 3 is opened (see FIG. 3B). In the fully open state, the portion of the arcuate spherical body 3b blocks the intake passage 2, so that the opening area can be made wider than that of the rotary valve 3 of the second embodiment.

In the third embodiment, a hemispherical shape is formed by combining two arcuate spherical shapes. Of course, a hemispherical shape is formed by three or more arcuate spherical shapes. You may. However, in such a case, it is necessary to insert and remove the arc-shaped spherical body formed in a nested shape by the rotation of the rotating shaft. become.

[Brief description of the drawings]

1A and 1B show a rotary valve structure of a throttle control device according to a first embodiment of the present invention, wherein FIG. 1A shows a fully closed state, FIG. 1B shows a fully open state, and FIG. , (A) A
View partial sectional views are shown.

FIGS. 2A and 2B show a rotary valve structure of a throttle control device according to a second embodiment of the present invention, wherein FIG. 2A shows a fully closed state, FIG. 2B shows a fully open state, and FIG. , (A) B
The sectional views are shown respectively.

3A and 3B show a rotary valve structure of a throttle control device according to a third embodiment of the present invention. FIG. 3A shows a fully closed state, and FIG. 3B shows a transition state from fully closed to fully open. Is shown.

FIG. 4 shows a rotary valve structure of a conventional throttle control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Throttle body main body 2 ... Intake passage 3 ... Rotary valve 3a ... Semi-spherical body 3b, 3c ... Arc spherical body 4 ... Rotation shaft 5 ... Bellows mechanism

Claims (6)

[Claims] 1. A rotary valve structure of a throttle control device that rotatably supports a rotary valve via a rotary shaft on a throttle body main body, wherein the rotary valve rotates when operating from a fully closed state to a fully open state. A rotary valve structure for a throttle control device, characterized in that the valve itself has a bellows mechanism that is folded about the rotary shaft. 2. The rotary valve structure for a throttle control device according to claim 1, wherein said bellows mechanism comprises a plurality of ribs attached to said rotary shaft and a sheet material covering said ribs. . 3. The rotary valve structure for a throttle control device according to claim 2, wherein the rib is formed in a semicircular shape or a square shape. 4. A rotary valve structure for a throttle control device according to claim 1, wherein when the bellows mechanism is folded, a flow passage passing through the inside of the bellows mechanism is formed. . 5. A rotary valve structure of a throttle control device in which a rotary valve is rotatably supported on a throttle body main body via a rotary shaft, wherein the rotary valve has a semi-spherical outer surface around the rotary shaft. A rotary valve structure for a throttle control device, which has a surface shape. 6. The rotary valve structure for a throttle control device according to claim 5, wherein said hemispherical shape is constituted by a combination of two arcuate spherical shapes.