JP2003314414A - Bypass air control device of intake control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bypass air control device which assures the accurate and stable control of bypass air amount and the stable operation of an air control valve for a long period. <P>SOLUTION: A downstream side bypass air passage 5A is opened in the bottom part 6A of a sliding valve chamber 6 having the air control valve 10 movably disposed therein, and a control hole 7 is opened in the side wall 6B of the sliding valve chamber 6. The control hole 7 is communicated with the upstream side bypass air passage 5C. In the air control valve 10, a recessed hole 10B is provided in the tip end face facing the bottom part 6A of the sliding valve chamber 6. The opening part 5B of a downstream side bypass air passage 5A to the bottom part 6A of the sliding valve chamber 6 is disposed facing the inside of the opening part 10C of the recessed hole 10B opening to the tip face 10A of the air control valve 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control device such as a throttle body for controlling the amount of air supplied to an engine,
In particular, the present invention relates to a bypass air control device that connects the upstream side and the downstream side of a throttle valve by a bypass air passage, bypassing an intake passage, and controls the amount of air flowing through the bypass air passage by an air control valve. Such a bypass air control device is used, for example, when controlling the idling air during idling operation of the engine or the starting air during cold starting of the engine.

[0002]

2. Description of the Related Art A conventional bypass air control device is shown in FIG.
Shown in. Reference numeral 1 denotes a throttle body having an intake passage 2 penetrating therethrough, and the intake passage is opened and closed by a throttle valve 4 attached to a throttle valve shaft 3 rotatably supported by the throttle body 1. , Which controls the amount of air going to the engine. Reference numeral 5 denotes a bypass air passage that bypasses the intake passage 2 and connects the intake passage 2A on the upstream side of the throttle valve 4 and the intake passage 2B on the downstream side of the throttle valve 4. A bypass air passage 5 is provided in the middle of the bypass air passage 5. The valve operating chamber 6 is formed. The downstream side of the downstream bypass air passage 5A divided by the sliding valve chamber 6 opens into the intake passage 2B on the downstream side of the throttle valve 4, and the upstream side has an opening 5B with a bottom portion 6A of the sliding valve chamber 6. To open. On the other hand, the side wall 6B of the sliding valve chamber 6 is provided with control holes 7 which are opened. The control holes 7 are located in the intake passage 2A upstream of the throttle valve 4 via the upstream bypass air passage 5C. To be opened. Reference numeral 8 denotes a cylindrical air control valve which is arranged in the sliding valve chamber 6 so as to be movable in the axial direction, and the bottom portion 6A of the sliding valve chamber 6 of the air control valve 8 is provided.
The front end surface 8A that faces the bottom surface is formed flat, and the air control valve 8 moves axially in the sliding valve chamber 6 so that the front end surface 8A is brought into contact with or close to the bottom portion 6A. The side portion 8B of the control valve 8 controls the opening of the control hole 7 into the sliding valve chamber 6. The air control valve 8 is provided with an operating rod 8C extending outward, and by operating the operating rod 8C, the air control valve 8 is reciprocated in the sliding valve chamber 6 in the axial direction.

According to such a conventional bypass air control device, when the air control valve 8 is operated to the left in FIG. 4 by the operating rod 8C, the front end surface 8A of the air control valve 8 has a bottom portion 6A of the sliding valve chamber 6. The control hole 7 is closed and controlled by the side 8B of the air control valve 8. According to the above, the air flow from the upstream side bypass air passage 5C to the downstream side bypass air passage 5A is blocked by the air control valve 8, so that the inside of the intake passage 2B downstream of the throttle valve 4 via the bypass air passage 5. Air is not supplied to. On the other hand, the air control valve 8 is operated by the operating rod 8.
When operated to the right in FIG. 4 by C, the side portion 8B of the air control valve 8 opens the control hole 7. According to this, the air flowing through the upstream bypass air passage 5C opens the control hole 7. Is controlled in accordance with the above, and the controlled air is supplied into the intake passage 2B on the downstream side of the throttle valve 4 via the sliding valve chamber 6 and the downstream bypass air passage 5A, which is necessary for the idling operation of the engine. It is possible to supply a proper idling air amount or a starting air amount suitable for starting operation of the engine. The amount of air controlled by the control hole 7 is determined by the opening degree of the control hole 7 due to the movement of the air control valve 8.

[0004]

The conventional bypass air control device as described above has the following problems. First, it is difficult to accurately control the air amount over a long period of time.
This is because the air containing carbon particles due to blowback from the engine passes from the downstream bypass air passage 5A to the opening 5B.
The carbon-containing air rushes into the sliding valve chamber 6 through the air passage, and collides with the flat tip surface 8A of the air control valve 8 and then changes its direction laterally. Focusing on the carbon particles contained in the air, the carbon particles have a large moment of inertia due to the difference in mass compared to the air, and the carbon particles flowing toward the side are the sliding valve chambers 6 It easily adheres to the control hole 7 opening on the side wall 6B. Then, during long-term use, the carbon particles reduce the opening of the control hole 7, which causes a problem that accurate air control cannot be performed. Secondly, the smooth operation of the air control valve 8 cannot be maintained for a long period of time. That is, when the carbon particles collide with the flat front end surface 8A of the air control valve 8, the carbon particles adhere to the front end surface 8A, and the carbon particles heading to one side adhere to the side wall 6B of the sliding valve chamber 6. According to this, these carbon particles may enter the sliding portion between the air control valve 8 and the sliding valve chamber 6, and the smooth operation of the air control valve 8 is hindered. Such a problem becomes a serious problem particularly in the case where the air control valve 8 is automatically operated by an electric motor or a heat-sensitive expansion / contraction member (wax element). According to the above-mentioned problem, it is necessary to increase the maintenance work frequency of the bypass air control device.

The bypass air control device according to the present invention has been made in view of the above-mentioned problems. It is possible to control a stable bypass air amount and a stable operation of the air control valve without largely changing the conventional bypass air control device. It is an object of the present invention to provide a bypass air control device in an intake air control device that can ensure the above-mentioned over a long period of time.

[0006]

In order to achieve the above object, a bypass air control device in an intake control device according to the present invention has an intake passage penetrating the inside thereof and the intake passage is formed by a throttle valve. A throttle body that is controlled to open and close, a bypass air passage that bypasses the throttle valve and connects the intake passage upstream of the throttle valve and the intake passage downstream of the throttle valve, and the bypass air passage that is arranged in the bypass air passage, In the intake air control device, which includes a bypass air control device including an air control valve for controlling the amount of air toward
A cylindrical bypass valve is provided at the bottom of the sliding valve chamber where it is movably arranged in the axial direction, and a downstream bypass air passage communicating with the intake passage on the downstream side of the throttle valve is opened and at the side wall of the sliding valve chamber. A control hole communicating with an upstream bypass air passage opening in an intake passage upstream of the throttle valve is formed, and a concave hole is formed in a front end surface of the air control valve facing the bottom of the sliding valve chamber. The first feature is that the opening to the bottom of the sliding valve chamber of the downstream bypass air passage is arranged so as to face the opening of the concave hole to the front end surface of the air control valve.

In addition to the first characteristic, the present invention has a second characteristic that the bottom portion of the concave hole formed in the air control valve is formed in a hemispherical shape.

In addition to the first characteristic, the present invention has a third characteristic in that the bottom of the recessed hole formed in the air control valve is formed flat.

Further, in addition to the first feature, the present invention provides
A fourth feature is that the bottom of the recess formed in the air control valve is formed in a conical shape.

Further, in addition to the first feature of the present invention, the air control valve is formed in a cylindrical shape, and
A sliding valve chamber accommodating the air control valve is formed in a circular cylindrical hole, and the circular cylindrical hole, an opening of the downstream bypass air passage to the sliding valve chamber, and a concave hole formed in the air control valve are formed. The fifth characteristic is that they are formed concentrically.

[0011]

According to the first feature of the present invention, the air containing the carbon-containing blowback having a high flow velocity flowing through the downstream bypass air passage is surely introduced into the concave hole of the air control valve, and The carbon particles that collide with the bottom with a high flow velocity are attached and captured on the bottom of the recess. On the other hand, the carbon particles contained in the air that has collided with the concave hole and whose velocity energy has decreased are the intake air on the downstream side of the throttle valve along with the air flowing from the sliding valve chamber toward the downstream bypass air passage in the intake process of the engine. It is sucked again into the passage.

According to the second aspect of the present invention, since the bottom of the recess is formed in a hemispherical shape, the carbon-containing air entering the recess produces a vortex by the hemispherical bottom. The velocity energy is reduced, and the carbon particles can be attached to the hemispherical bottom and captured, and can be sucked again into the intake passage downstream of the throttle valve.

Further, according to the third feature of the present invention, the carbon-containing air entering the recess collides with the flat bottom portion, and the velocity energy thereof can be greatly reduced. Therefore,
The carbon particles can be captured in this bottom portion and the sucking property into the intake passage downstream of the throttle valve can be improved.

Further, according to the fourth feature of the present invention, the trapping property of the carbon particles and the suction property into the intake passage on the downstream side of the throttle valve are substantially the same as those of the second feature, but the concave hole is manufactured. You can easily.

Further, according to the fifth feature of the present invention, the opening portion of the downstream bypass air passage can be accurately and inexpensively arranged in the concave hole of the air control valve.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bypass air control device in an intake air control device according to the present invention will be described below with reference to FIG. The same reference numerals are used for the same structural parts as in FIG. Reference numeral 10 denotes an air control valve that is arranged in the sliding valve chamber 6 so as to be movable in the axial direction. A tip surface 10A of the air control valve 10 facing the bottom portion 6A of the sliding valve chamber 6 faces the inside of the air control valve 10. The recessed hole 10B is recessed. And
The opening 5B of the downstream bypass air passage 5A is arranged so as to face the opening 10C of the recessed hole 10B of the air control valve 10 to the tip surface 10A. In the above description, "to face the inside of the opening 10C" means that the opening 10C is the opening 10C of the recessed hole 10B.
It is located in the projection plane of. More specifically, the downstream side bypass air passage 5A and the sliding valve chamber 6 are formed in a circular hole, and the air control valve 10 including a concave hole 10B formed of a circular hole is formed in a cylindrical shape. ,
Downstream bypass air passage 5A, sliding valve chamber 6 and concave hole 10
The air control valve 10 including B is formed concentrically in the longitudinal axis direction, and at that time, the diameter d of the downstream bypass air passage 5A including the opening 5B is the diameter D of the recessed hole 10B including the opening 10C. The diameter is smaller or the same.
(Note that the recessed hole 10B and the air control valve 10 are formed concentrically. The operating rod 10D is formed integrally with the air control valve 10.)

According to the bypass air control device constructed as described above, the air control valve 10 is at the leftmost position and the tip surface 10A thereof is disposed near the bottom portion 6A of the sliding valve chamber 6 as in the conventional case. The air flow from the upstream bypass air passage 5C to the downstream bypass air passage 5A is blocked by the side portion 10E of the air control valve 10 closing and holding the control hole 7, while the air control valve 10 moves to the right. When the side portion 10E opens the control hole 7, the bypass air according to the degree of opening of the control hole 7 is supplied into the intake passage 2B on the downstream side of the throttle valve 4 via the bypass air passage 5.

Here, when the bypass air is supplied, the air containing carbon particles blown back from the engine flows from the downstream bypass air passage 5A to the opening 5B.
Enters into the sliding valve chamber 6 with high velocity energy via. Here, in the bypass air control device according to the present invention, the opening portion 5B of the downstream side bypass air passage 5A faces the inside of the recessed hole 10B of the air control valve 10 and is opened. The air containing the carbon particles having energy enters the concave hole 10B steadily through the opening 10C. And the recessed hole 10B
The air entering the inside causes a turbulent flow because the concave hole 10B is a blind hole.
The carbon particles that collide with the inner wall of the recess are attached to and captured by the inner wall of the recessed hole 10B. On the other hand, the residual carbon particles contained in the air have their velocity energy reduced by the turbulent flow generated in the recess 10B, so that the sliding valve chamber 6
Is sucked into the intake passage 2B on the downstream side of the throttle valve 4 again by the air flow from the downstream side bypass air passage 5A. As described above, according to the present invention, the air containing the carbon particles generated by the blowback of the engine causes the sliding valve chamber 6 to flow.
Even if the carbon particles enter the inside with a high velocity energy, the carbon particles can be reliably captured by the concave hole 10B of the air control valve 10, and the velocity energy of the remaining carbon particles can be reduced so that the carbon particles on the downstream side of the throttle valve 4 again. Since the air can be sucked out into the intake passage 2B, the adhesion of carbon particles to the control hole 7 opening in the sliding valve chamber 6 can be greatly reduced, so that stable and accurate supply of bypass air can be achieved over a long period of time. , Control has become possible. Further, according to the above, it is possible to prevent the carbon particles from adhering to the sliding portion between the sliding valve chamber 6 and the air control valve 10, and thereby the stable operation of the air control valve 10 can be obtained for a long period of time. It is a thing. Further, since it is possible to stably control bypass air over a long period of time and stabilize the operability of the air control valve 10 as described above, it is possible to reduce the maintenance frequency of the bypass air control device and perform maintenance. I was able to greatly improve the property. Further, according to the present invention, as compared with the conventional air control valve 10, the concave hole 10 is simply used.
Since it can be achieved by additionally processing B, the versatility is high and the increase in the manufacturing cost is extremely small. Further, according to the present invention, the downstream bypass air passage 5A including the opening 5B, the sliding valve chamber 6, and the air control valve 10 including the recessed hole 10B are formed concentrically. The opening 5B of the downstream bypass air passage 5A can be more reliably and inexpensively connected to the recess 10 of the air control valve 10.
It can be placed facing B. At this time, the diameter d of the downstream bypass air passage 5A including the opening 5B is set to the opening 10C.
The above can be achieved by forming the concave hole 10B having a diameter smaller than the diameter D of the concave hole 10B.

If the bottom of the recess 10B of the air control valve 10 is formed in a hemispherical shape as shown in FIG. 1, the recess 10B is formed.
It is possible to more positively form a vortex flow at the bottom of the, and to achieve the effect of adhering the carbon particles into the concave holes 10B and the effect of reducing velocity energy for the carbon particles.

Further, as shown in FIG. 2, the air control valve 10
By forming the bottom portion of the recessed hole 10B in a flat shape, blowback air containing carbon particles can be made to collide in a direction orthogonal to the bottom portion, and the adhesion of carbon to the bottom portion can be further enhanced. You can

Furthermore, as shown in FIG. 3, since the bottom of the recessed hole 10B of the air control valve 10 is formed in a conical shape, the adhesion to carbon particles and the reduction of velocity energy have a hemispherical bottom. Although it is substantially the same as the one described above, since the recessed hole 10B can be formed by drilling, the air control valve can be manufactured inexpensively and easily.
The shape of the bottom of the recess 10B is not limited to the above-mentioned embodiment.

[0022]

As described above, according to the bypass air control device in the intake air control device according to the present invention, the cylindrical air control valve is provided at the bottom of the sliding valve chamber in which it is axially movably arranged, rather than the throttle valve. While opening a downstream bypass air passage communicating with the downstream intake passage, a control hole communicating with an upstream bypass air passage opening in the intake passage upstream of the throttle valve is formed in the side wall of the sliding valve chamber. Further, a concave hole is formed in the tip surface of the air control valve which faces the bottom of the sliding valve chamber,
Since the opening to the bottom of the sliding valve chamber of the downstream side bypass air passage is arranged so as to face the opening of the concave hole to the tip surface of the air control valve, air containing carbon particles is controlled by the blowback of the engine. Even if it enters the valve, the carbon particles can be effectively adhered to the concave holes in the air control valve, the velocity energy of the carbon particles can be reduced, and the carbon particles can be sucked again into the intake passage downstream of the throttle valve. As a result, carbon particles can be prevented from adhering to the control holes, and stable and accurate control of bypass air can be achieved over a long period of time. In addition, carbon particles can be reduced from adhering to the sliding portion between the air control valve and the sliding valve chamber, which enables stable and good operation of the air control valve for a long period of time. Further, according to the above, the frequency of maintenance work can be reduced, which contributes to improvement of maintainability. Further, the concave hole is provided in addition to the conventional air control valve, and its implementation is extremely easy.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a bypass air control device in an intake air control device according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing another embodiment of the air control valve used in the bypass air control device of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing still another embodiment of the air control valve used in the bypass air control device of the present invention.

FIG. 4 is a vertical sectional view showing a conventional bypass air control device.

[Explanation of symbols]

4 Throttle valve 5 Bypass air passage 5A Downstream bypass air passage 5B Downstream bypass air passage Sliding valve chamber 6 to bottom 6A 5C Upstream bypass air passage 6 Sliding valve chamber 6A Sliding valve chamber 6 Bottom 6B Side wall 7 of sliding valve chamber 6 Control hole 10 Air control valve 10B Recessed hole

Claims (5)

[Claims] 1. A throttle body in which an intake passage is bored through the inside and the intake passage is controlled to be opened and closed by a throttle valve, an intake passage bypassing the throttle valve and upstream of the throttle valve, and a throttle valve. Located in the bypass air passage, which connects the more downstream intake passage, and the bypass air passage,
In a suction air control device including a bypass air control device having an air control valve for controlling the amount of air flowing from upstream to downstream, a sliding valve chamber 6 in which a tubular air control valve 10 is arranged so as to be axially movable. A bypass side bypass air passage 5A connected to the intake passage 2B on the downstream side of the throttle valve 4 at the bottom portion 6A of the
And a side wall 6B of the sliding valve chamber 6 is provided with a control hole 7 connected to an upstream bypass air passage 5C opening to the intake passage 2A upstream of the throttle valve 4, and the air control valve Tip surface 10A facing the bottom portion 6A of the sliding valve chamber 6
A recessed hole 10B is bored in the bottom side 6A of the sliding valve chamber 6 of the downstream bypass air passage, and a recessed hole 10B is formed in the opening 10C of the recessed hole 10B to the tip surface 10A of the air control valve 10. A bypass air control device in an intake air control device, which is arranged facing each other. 2. A recessed hole 10B formed in the air control valve.
The bypass air control device in the intake control device according to claim 1, wherein a bottom portion of the intake air control device is formed in a hemispherical shape. 3. A recessed hole 10B formed in the air control valve.
The bypass air control device in the intake control device according to claim 1, wherein a bottom portion of the intake air control device is formed flat. 4. A recessed hole 10B formed in the air control valve.
The bypass air control device in the intake control device according to claim 1, wherein a bottom portion of the intake air control device has a conical shape. 5. The air control valve is formed in a cylindrical shape, and the sliding valve chamber 6 for accommodating the air control valve 10 is formed in a circular cylindrical hole, and the circular cylindrical hole and the downstream bypass air passage 5A. 5B to the sliding valve chamber 6 and the air control valve 10
The bypass air control device in the intake control device according to claim 1, wherein the concave hole 10 </ b> B formed in the same is formed concentrically.