JP3925287B2 - Bypass air control device in intake control device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an intake control device such as a throttle body that controls the amount of air supplied to an engine, and in particular, connects the upstream and downstream of a throttle valve by bypassing an intake passage through a bypass air passage and the bypass air. The present invention relates to a bypass air control device in which the amount of air flowing through a passage is controlled by an air control valve. Such a bypass air control device is used, for example, when controlling idling air during engine idling operation or starting air during engine cold start.
[0002]
[Prior art]
A conventional bypass air control device is shown in FIG. Reference numeral 1 denotes a throttle body having an intake passage 2 penetrating therethrough. The intake passage is opened and closed by a throttle valve 4 attached to a throttle valve shaft 3 rotatably supported on the throttle body 1. This controls the amount of air going to the engine. A bypass air passage 5 bypasses the intake passage 2 and connects the intake passage 2A upstream of the throttle valve 4 and the intake passage 2B downstream of the throttle valve 4. A valve operating chamber 6 is formed. The downstream bypass air passage 5A divided by the sliding valve chamber 6 opens in the intake passage 2B downstream from the throttle valve 4, and the upstream has an opening 5B and the bottom 6A of the sliding valve chamber 6 is opened. Open to. On the other hand, control holes 7 are formed in the side wall 6B of the sliding valve chamber 6 so as to open. These control holes 7 are located in the intake passage 2A upstream of the throttle valve 4 via the upstream bypass air passage 5C. Is opened. 8 is a cylindrical air control valve disposed in the sliding valve chamber 6 so as to be movable in the axial direction, and the front end surface 8A of the air control valve 8 facing the bottom 6A of the sliding valve chamber 6 is formed flat. When the air control valve 8 moves in the sliding valve chamber 6 in the axial direction, its front end surface 8A is in contact with or close to the bottom portion 6A, while the side 8B of the air control valve 8 has a control hole. 7 is controlled to open into the sliding valve chamber 6. The air control valve 8 is provided with an operating rod 8C extending outward, and the air control valve 8 is reciprocated in the axial direction in the sliding valve chamber 6 by operating the operating rod 8C.
[0003]
According to such a conventional bypass air control device, when the air control valve 8 is moved leftward in FIG. 4 by the operating rod 8C, the front end surface 8A of the air control valve 8 contacts the bottom 6A of the sliding valve chamber 6. Alternatively, the control hole 7 is closed and controlled by the side portion 8B of the air control valve 8. According to the above, since the air flow from the upstream bypass air passage 5C toward the downstream bypass air passage 5A is blocked by the air control valve 8, the air flow in the intake passage 2B downstream from the throttle valve 4 via the bypass air passage 5 Air is not supplied. On the other hand, when the air control valve 8 is moved to the right in FIG. 4 by the operating rod 8C, the side portion 8B of the air control valve 8 opens the control hole 7. According to this, the upstream bypass air passage 5C is opened. The flowing air is controlled according to the opening of the control hole 7, and this controlled air is supplied into the intake passage 2B downstream of the throttle valve 4 through the sliding valve chamber 6 and the downstream bypass air passage 5A. Thus, it is possible to supply the idling air amount necessary for the engine idling operation or the starting air amount suitable for the engine starting operation. 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]
[Problems to be solved by the invention]
Such a conventional bypass air control device has the following problems. First, it is difficult to accurately control the amount of air over a long period of time. This is because air containing carbon particles blown back from the engine enters the sliding valve chamber 6 through the downstream bypass air passage 5A through the opening 5B, and the air containing the carbon is supplied to the air control valve 8. After colliding with the flat front end surface 8A, the direction of flow changes to the side. When attention is paid to the carbon particles contained in the air, the carbon particles have a large moment of inertia from the difference in mass compared to the air, and the carbon particles flowing toward the side are in the sliding valve chamber 6. It is easy to adhere to the control hole 7 opened in the side wall 6B. In use over a long period of time, the carbon particles reduce the opening of the control hole 7, resulting in a problem that accurate air control cannot be performed. Secondly, the smooth operation of the air control valve 8 cannot be maintained over 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 directed 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 inconvenience becomes a serious problem particularly when the air control valve 8 is automatically operated by an electric motor and a heat-sensitive expansion / contraction member (wax element). And according to the said malfunction, it is necessary to increase the frequency of the maintenance work of a bypass air control apparatus.
[0005]
The bypass air control device according to the present invention has been made in view of the above-mentioned problems, and stable control of the bypass air amount and stable operation of the air control valve can be performed for a long time without greatly 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 control device that can be guaranteed over a wide range.
[0006]
[Means for solving the problems]
In order to achieve the above object, the bypass air control device in the intake control device according to the present invention includes a throttle body in which an intake passage passes through and is controlled to be opened and closed by a throttle valve, and a throttle A bypass air passage that bypasses the valve and connects the intake passage upstream of the throttle valve and the intake passage downstream of the throttle valve, and an air control that is disposed in the bypass air passage and controls the amount of air flowing upstream to downstream A bypass air control device including a valve, and an intake control device comprising: a cylindrical air control valve disposed downstream of the throttle valve at a bottom portion of a sliding valve chamber in which the cylindrical air control valve is movably disposed in the axial direction. The side bypass air passage is opened, and a control hole connected to the upstream bypass air passage that opens to the intake passage upstream of the throttle valve is formed in the side wall of the sliding valve chamber. Further, the the distal end surface facing the bottom of the slide valve chamber of the air control valve recessed hole is bored, the opening area of the opening to the bottom of the sliding valve chamber of the downstream bypass air passage of the air control valve is formed smaller than the opening area of the opening of the concave hole of the distal end surface, the opening of the downstream bypass air passage to the first, characterized in that arranged extraordinary useless in the opening of the concave hole of the air control valve.
[0007]
In addition to the first feature, the second feature of the present invention is that the bottom of the concave hole formed in the air control valve is formed in a hemispherical shape.
[0008]
In addition to the first feature, the present invention has a third feature that the bottom of the concave hole formed in the air control valve is formed flat.
[0009]
Furthermore, the present invention is characterized in that, in addition to the first feature, the bottom of the concave hole formed in the air control valve is formed in a conical shape.
[0010]
Furthermore, in addition to the first feature, the present invention forms the air control valve in a cylindrical shape, and forms a sliding valve chamber for housing the air control valve in a circular cylindrical hole. A fifth feature is that the opening to the sliding valve chamber of the downstream bypass air passage and the concave hole formed in the air control valve are formed concentrically.
[0011]
[Action]
According to the first feature of the present invention, the air by the carbon-containing blow-back with a fast flow velocity flowing through the downstream bypass air passage is surely introduced into the concave hole of the air control valve, and is fast at the bottom of the concave hole. The carbon particles that collide with the flow velocity are attached to the bottom of the concave hole and captured. On the other hand, the carbon particles contained in the air that collided with the concave holes and the velocity energy thereof decreased decreased along with the air flowing from the sliding valve chamber toward the downstream bypass air passage in the engine intake process. It is sucked out again into the passage.
[0012]
Further, according to the second feature of the present invention, since the bottom of the concave hole is formed in a hemispherical shape, the carbon-containing air entering the concave hole generates a vortex by the hemispherical bottom and the velocity energy is increased. The carbon particles are reduced and attached to the bottom of the hemispherical surface, and can be sucked again into the intake passage downstream of the throttle valve.
[0013]
Further, according to the third feature of the present invention, the carbon-containing air entering the concave hole collides with the flat bottom portion, and the velocity energy can be greatly reduced. Accordingly, the carbon particles can be captured at the bottom, and the sucking performance into the intake passage on the downstream side of the throttle valve can be improved.
[0014]
Further, according to the fourth feature of the present invention, the capture property of the carbon particles and the suction property into the intake passage downstream from the throttle valve are substantially the same as the second feature, but the production of the recessed hole can be facilitated. .
[0015]
Furthermore, according to the fifth feature of the present invention, the opening of the downstream bypass air passage can be accurately and inexpensively arranged in the recessed hole of the air control valve.
[0016]
【Example】
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. In addition, about the same structure part as FIG. 4, the description is abbreviate | omitted using the same code | symbol. Reference numeral 10 denotes an air control valve disposed in the sliding valve chamber 6 so as to be axially movable. A tip surface 10A of the air control valve 10 facing the bottom 6A of the sliding valve chamber 6 faces the air control valve 10. Thus, the recessed hole 10B is recessed. The opening 5B of the downstream bypass air passage 5A is disposed facing the opening 10C to the tip surface 10A of the recessed hole 10B of the air control valve 10. In the above description, facing the opening 10C means that the opening 10C is located in the projection plane of the opening 10C of the concave hole 10B. More specifically, the downstream side bypass air passage 5A and the sliding valve chamber 6 are formed with circular holes, and the air control valve 10 including a concave hole 10B made of a circular hole is formed in a cylindrical shape and the above-mentioned. The downstream bypass air passage 5A, the sliding valve chamber 6, and the air control valve 10 including the concave hole 10B are formed concentrically in the longitudinal axial direction, and at that time, the downstream bypass air passage including the opening 5B The diameter d of 5A is formed smaller than the diameter D of the concave hole 10B including the opening 10C. (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.)
[0017]
According to the bypass air control device constructed as described above, the air control valve 10 is located on the leftmost side, and the front end surface 10A thereof is disposed in the vicinity of the bottom 6A of the sliding valve chamber 6 as in the conventional case. The air flow from the bypass air passage 5C toward 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 is operated to the right side. When the part 10 </ b> E opens the control hole 7, bypass air corresponding to the degree of opening of the control hole 7 is supplied into the intake passage 2 </ b> B downstream from the throttle valve 4 via the bypass air passage 5.
[0018]
Here, when supplying the bypass air, the air containing carbon particles blown back from the engine enters the sliding valve chamber 6 from the downstream bypass air passage 5A through the opening 5B with high velocity energy. Here, in the bypass air control device according to the present invention, the opening 5B of the downstream bypass air passage 5A is opened facing the recessed hole 10B of the air control valve 10, so that this high speed is achieved. Air containing carbon particles having energy enters into the concave hole 10B through the opening 10C. The air entering the concave hole 10B generates turbulent flow because the concave hole 10B is a bag hole. According to this, the carbon particles that collide with the inner wall of the concave hole 10B are in the concave hole 10B. It is attached to the inner wall and captured. On the other hand, the remaining carbon particles contained in the air are reduced again by the air flow from the sliding valve chamber 6 toward the downstream bypass air passage 5A because the velocity energy is reduced by the turbulent flow generated in the concave hole 10B. The air is sucked into the intake passage 2B on the downstream side of the throttle valve 4. As described above, according to the present invention, even if air containing carbon particles generated by blowback of the engine enters the sliding valve chamber 6 with fast velocity energy, the carbon particles are surely inserted into the concave hole 10B of the air control valve 10. Since the velocity energy of the remaining carbon particles can be reduced and sucked again into the intake passage 2B on the downstream side of the throttle valve 4, the control hole 7 opening in the sliding valve chamber 6 can be obtained. Thus, the adhesion of carbon particles can be greatly reduced, and the supply and control of bypass air can be stably and accurately performed over a long period of time. Further, according to the above, it is possible to suppress the adhesion of carbon particles at the sliding portion between the sliding valve chamber 6 and the air control valve 10, thereby obtaining a stable operation of the air control valve 10 over a long period of time. Is. Further, according to the above, stable control of the bypass air over a long period of time and stabilization of the operability of the air control valve 10 can be achieved, so that the maintenance frequency of the bypass air control device can be reduced, and maintenance can be performed. I was able to greatly improve the performance. Further, according to the present invention, this can be achieved by simply adding the concave hole 10B to the conventional air control valve 10, so that the versatility is high and the manufacturing cost is extremely small. Furthermore, 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 disposed to face the recessed hole 10B of the air control valve 10 more reliably and inexpensively. At this time, the above can be achieved by forming the diameter d of the downstream bypass air passage 5A including the opening 5B smaller than the diameter D of the concave hole 10B including the opening 10C.
[0019]
Further, if the shape of the bottom of the concave hole 10B of the air control valve 10 is formed in a hemispherical shape as shown in FIG. 1, a vortex can be more actively formed at the bottom of the concave hole 10B, and the carbon particles enter the concave hole 10B. Adhesiveness and speed energy reduction effect on carbon particles can be achieved.
[0020]
Further, as shown in FIG. 2, according to the bottom of the concave hole 10 </ b> B of the air control valve 10 being formed in a flat shape, blown-back air containing carbon particles can collide perpendicularly toward the bottom, The adherence of carbon to the bottom can be further enhanced.
[0021]
Furthermore, as shown in FIG. 3, when the bottom of the concave hole 10B of the air control valve 10 is formed in a conical shape, the adhesion to carbon particles and the reduction in velocity energy are as follows. Although it is substantially the same, since the formation of the concave hole 10B can be performed by drilling, the manufacture of the air control valve can be easily performed at low cost. In addition, the shape of the bottom part of the concave hole 10B is not limited by the said Example.
[0022]
【The invention's effect】
As described above, according to the bypass air control device in the intake control device of the present invention, the intake passage on the downstream side of the throttle valve at the bottom of the sliding valve chamber in which the cylindrical air control valve is movably disposed in the axial direction. A control hole connected to the upstream bypass air passage that opens to the intake passage upstream of the throttle valve is formed in the side wall of the sliding valve chamber, and the air control valve A concave hole is formed in the tip surface facing the bottom of the sliding valve chamber, and the opening area of the opening of the downstream bypass air passage to the bottom of the sliding valve chamber is recessed to the tip surface of the air control valve. is formed smaller than the opening area of the opening of the hole, the opening portion of the downstream bypass air passage has extraordinary useless placed in the opening of the concave hole of the air control valve, air air control containing carbon particles by blow back of the engine Enter the valve However, the carbon particles can be effectively adhered to the concave holes in the air control valve and the velocity energy of the carbon particles can be reduced, and can be sucked again into the intake passage downstream of the throttle valve. Therefore, the adhesion of the carbon particles to the control hole can be suppressed, and the stable control of the bypass air that is stable over a long period of time can be achieved. In addition, the adhesion of carbon particles at the sliding portion between the air control valve and the sliding valve chamber can be reduced, whereby the air control valve can be operated stably and satisfactorily for a long period of time. Moreover, according to the above, the maintenance work frequency can be reduced, which can contribute to the improvement of maintainability. Further, the concave hole is provided in addition to the conventional air control valve, and its implementation is very easy.
[Brief description of the 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 an essential part showing another embodiment of an air control valve used in the bypass air control device of the present invention.
FIG. 3 is a longitudinal sectional view of an essential 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 longitudinal 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 Opening 5C to the bottom 6A of the sliding valve chamber 6 in the downstream bypass air passage Upstream bypass air passage 6 Sliding valve chamber 6A In the sliding valve chamber 6 Bottom 6B Side wall 7 of sliding valve chamber 6 Control hole 10 Air control valve 10B Concave hole

Claims (5)

A throttle body that is penetrated by an intake passage and is controlled to be opened and closed by a throttle valve, and an intake passage that bypasses the throttle valve and that is upstream of the throttle valve and intake air that is downstream of the throttle valve a bypass air passage for communicating the passage, is disposed in the bypass air passage, and a bypass air control device including an air control valve for controlling the amount of air directed from the upstream to the downstream, in a more composed intake control device, a cylindrical air control A downstream bypass air passage 5A connected to the intake passage 2B downstream of the throttle valve 4 is opened at the bottom 6A of the sliding valve chamber 6 in which the valve 10 is movably disposed in the axial direction. A control hole 7 connected to the upstream bypass air passage 5C that opens to the intake passage 2A upstream of the throttle valve 4 is formed in the side wall 6B, and further, the bottom 6 of the sliding valve chamber 6 of the air control valve. The concave hole 10B on the distal end surface 10A facing is bored, concave opening area of the opening 5B of the bottom section 6A of the sliding valve chamber 6 of the downstream bypass air passage to the distal end surface 10A of the air control valve 10 It is formed smaller than the opening area of the opening 10C of the hole 10B, the intake control device in which the opening 5B of the downstream bypass air passage, characterized in that arranged extraordinary useless in the opening 10C of the concave hole of the air control valve Bypass air control device.   The bypass air control device in an intake control device according to claim 1, wherein the bottom of the concave hole 10B formed in the air control valve is formed in a hemispherical shape.   The bypass air control device in an intake control device according to claim 1, wherein a bottom portion of the concave hole 10B formed in the air control valve is formed flat.   The bypass air control device for an intake air control device according to claim 1, wherein the bottom of the concave hole 10B formed in the air control valve is formed in a conical shape.   The air control valve is formed in a cylindrical shape, and the sliding valve chamber 6 that houses the air control valve 10 is formed in a circular cylindrical hole. The circular cylindrical hole and the sliding valve chamber of the downstream bypass air passage 5A are formed. The bypass air control device in the intake control device according to claim 1, wherein an opening 5 </ b> B to 6 and a concave hole 10 </ b> B formed in the air control valve 10 are formed concentrically.

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