JP2006037916A - Bypass air control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately uniformize amount of bypass air flowing toward each bypass air outflow hole, in a bypass air control device for controlling openings of the plurality of bypass air outflow holes by using a single bypass valve. <P>SOLUTION: A guide hole 9a is penetrated through a control hole member 9, and a plurality of control holes 9c, 9e are concentrically bored in side walls 9b, 9d of the control hole member 9. The control hole member 9 is inserted into inside of a slide valve guiding cylinder 5. In this state, the guide hole 9a is opened so as to face a bypass valve inflow hole 6, and each of the plurality of the control hole 9c, 9e is opened so as to face each of the plurality of bypass air outflow holes 7a, 7b. The bypass valve 10 is arranged on the guide hole 9a, and the control holes 9c, 9e are controlled to be opened/closed by the bypass valve 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an intake control device that controls the amount of air supplied to an engine, and in particular, bypasses a throttle valve disposed in an intake passage that passes through a throttle body, and an intake passage upstream of the throttle valve. The present invention relates to a bypass air control device that controls the amount of bypass air from the throttle valve toward the intake passage downstream of the throttle valve.

A plurality of bypass air outflow holes directed to a plurality of intake passages downstream from the throttle valve are respectively opened in a single valve body storage chamber, and the openings of the plurality of bypass air outflow holes into the valve body storage chamber are respectively Japanese Patent Application Laid-Open No. 2002-89415 discloses a bypass air control device that is controlled to have the same opening degree by a single bypass valve that is movably disposed in a body storage chamber.
Referring to FIG. 5 of the publication, the valve body storage chamber 32 is formed as a single unit, the inlet 31 of the bypass passage is opened below, and the first upstream side is formed laterally. The branch passage 36 and the second upstream branch passage 37 are opened.
A first downstream branch passage 63 is formed from the end of the first upstream branch passage 36 to the intake passage downstream of the first throttle valve of the first intake passage. A second downstream branch passage 65 is formed from the end to the intake passage downstream of the second throttle valve of the second intake passage.
Further, a single bypass valve 33 is movably disposed in the valve body storage chamber 32, and the opening of the first and second upstream branch passages 36 and 37 into the valve body storage chamber 32 has the same opening degree. Be controlled.
Accordingly, by operating the single bypass valve 33, the first and second upstream branch passages 36 and 37 are controlled to have the same opening degree, whereby the first and second throttles of the first and second intake passages are controlled. The same amount of bypass air is supplied toward each intake passage downstream of the valve.
JP 2002-89415 A

According to such a conventional bypass air control device, the single bypass valve 33 is used to control the amount of bypass air directed to the first and second upstream branch passages 36 and 37 in the same way. The opening positions and the opening shapes of the first and second upstream branch passages 36 and 37 into the valve body storage chamber 32 need to be the same.
Here, paying attention to the first and second upstream branch passages 37, these passages are formed to be relatively long. Generally, the throttle body 23 formed by injection molding of aluminum is processed by drilling or the like. It is formed.
When the first and second upstream distribution passages 37 are formed relatively long from the plug 68 side into the inner valve body storage chamber 32, the first and second upstream side distribution passages 37 are inserted into the valve body storage chamber 32, which is the tip portion thereof. The opening positions and the opening shapes of the first and second upstream branch passages 36 and 37 slightly change depending on the vibration of the cutting tool or the escape of the cutting tool due to the cast hole generated in the throttle body.
When the bypass valve 33 is operated, the opening deviation of the first and second upstream branch passages 36 and 37 into the valve body storage chamber 32 is caused in the first and second upstream branch passages 36 and 37. It is difficult to uniformly control the amount of bypass air flowing.
Even when the first and second upstream distribution passages 36 and 37 are processed in a straight line from one side to the other side, the length of the drill becomes large and the above problem still remains. Remains.

  The bypass air control device according to the present invention is made in view of the above problems, and controls the opening of a plurality of bypass air outflow holes using a single bypass valve. An object of the present invention is to provide a bypass air control device capable of uniformly controlling the amount with high accuracy.

In order to achieve the above object, the bypass air control device according to the present invention includes a bypass air inflow hole and a plurality of bypass air outflow holes directed to a plurality of intake passages downstream from the throttle valve in the sliding valve guide cylinder. In the bypass air control device that is opened and closed by at least a bypass valve disposed in the sliding valve guide cylinder,
The control hole member made of a hollow annular body has a guide hole penetrating in the axial direction and a plurality of control holes are concentrically drilled in the side wall,
The control hole member is inserted and arranged in the slide valve guide cylinder, the guide hole of the control hole member is opened facing the bypass air inflow hole, and the plurality of control holes are opened facing the plurality of bypass air outflow holes, respectively. Further, the bypass valve is movably disposed in the guide hole, and the control hole is controlled to be opened and closed by the bypass valve.

The control hole member made of a hollow annular body has a guide hole formed in the axial direction, and a plurality of control holes are formed in the side wall portion.
The control hole member is inserted and arranged in the slide valve guide cylinder. At this time, the guide hole faces the bypass air inflow hole, and the plurality of control holes face the plurality of bypass air outflow holes. .
The bypass valve is movably disposed in the guide hole of the control hole member, and the plurality of control holes are controlled to the same opening degree by the bypass valve.
When the bypass valve is operated, the plurality of control holes of the control hole member are controlled to the same opening degree by the bypass valve, and the same bypass air amount is accurately controlled by the control hole. The air is supplied from the outflow hole to the intake passage downstream of the throttle valve of each intake passage.

According to the bypass air control device of the present invention, in particular, the amount of bypass air directed to each bypass air outflow hole is controlled by each control hole formed in the control hole member.
Here, since the control hole member is formed of a hollow annular body, the hole length of the control hole drilled in the control hole member can be made extremely small. The hole shape can be formed very accurately and uniformly. On the other hand, since the bypass valve is also arranged in the guide hole of the control hole member, the opening degree of the control hole by each bypass valve can be controlled to the same opening degree very accurately, and thereby, from each control hole to each bypass air outflow hole. A uniform amount of bypass air can be supplied.
In addition, since the control hole member is formed of a hollow annular body, the diameter of the conventional slide valve guide cylinder having a cylindrical shape may be slightly increased according to the thickness of the control hole member. The bypass air control device can be easily improved.
In addition, if a processing defect occurs in the control hole member, the control hole member is discarded. However, the throttle body is discarded due to a processing error in the bypass air outflow hole formed in the throttle body. Compared to the above, it is possible to achieve a reduction in scrap costs.

Hereinafter, an embodiment of a bypass air control device according to the present invention will be described.
FIG. 1 is a cross-sectional view of an essential part of a bypass air control device according to the present invention.
Reference numeral 1 denotes a throttle body having a first intake passage 1a and a second intake passage 1b penetrating from the front to the back in the figure, and the first and second intake passages 1a and 1b are throttle valves. The first throttle valve 3a and the second throttle valve 3b attached to the shaft 2 are opened and closed.
Reference numeral 4 denotes a bypass body formed integrally with or separately from the throttle body 1, and the following is formed.
Reference numeral 5 denotes a sliding valve guide tube drilled upward from the lower end surface 4a of the bypass body 4 through the large diameter hole 4b. The bottom portion 5a has an intake passage upstream of the throttle valve or air. A continuous bypass air inflow hole 6 is opened.
A first bypass air outflow hole 7a is opened in the right side wall 5b of the sliding valve guide cylinder 5, and the first bypass air outflow hole 7a is a first intake passage downstream of the first throttle valve 3a. (Not shown).
The first bypass air outflow hole 7a is formed by a horizontal channel 7a1 drilled in the horizontal direction in the drawing and a vertical channel 7a2 drilled upward from the end of the horizontal channel 7a1. Therefore, the horizontal flow path 7a1 in the horizontal direction is formed long. This is because the sliding valve guide cylinder 5 and the first intake passage 1a are arranged apart from each other.
Further, a second bypass air outflow hole 7b is opened in the left side wall 5c of the sliding valve guide cylinder 5, and the second bypass air outflow hole 7b is a second intake passage downstream of the second throttle valve 3b. (Not shown).
The second bypass air outflow hole 7b is formed by a horizontal channel 7b1 drilled in the horizontal direction in the drawing and a vertical channel 7b2 drilled upward from the horizontal channel 7b1. The horizontal flow path 7b1 in the horizontal direction is formed long. This is because the sliding valve guide cylinder 5 and the second intake passage 1b are arranged apart from each other.
According to the above, the sliding valve guide cylinder 5 (referred to as such for convenience) has the bypass air inflow hole 6 opened at the bottom 5a, the first bypass air outflow hole 7a opened at the right side wall 5b, and the left side. A second bypass air outflow hole 7b opens in the wall 5c. At this time, the first bypass air outflow hole 7a and the second bypass air outflow hole 7b are formed concentrically facing each other.
However, it is not necessary to increase the concentric accuracy of the first and second bypass air outflow holes 7a and 7b.
This is because the opening of the first and second bypass air outflow holes 7a, 7b into the sliding valve guide cylinder 5 is not directly controlled by the bypass valve, as will be described later.

Next, the control hole member 9 inserted by being lightly press-fitted or screwed into the sliding valve guide cylinder 5 will be described with reference to FIGS.
The control hole member 9 forms a hollow annular body such as a pipe material. A guide hole 9a penetrates in the longitudinal axis direction, and the first control hole 9c penetrates the right side wall 9b. A second control hole 9e is formed through the left side wall 9d.
The first and second control holes 9c and 9e are formed concentrically facing a fixed height H from a reference surface in the longitudinal axis direction of the control hole member 9, for example, an upper end surface 9f of the control hole member 9. The

The control hole member 9 is lightly press-fitted into the sliding valve guide cylinder 5 through the large diameter hole 4b, and the upper end surface 9f of the control hole member 9 is brought into contact with the bottom 5a of the sliding valve guide cylinder 5. It is good to contact.
The insertion of the control hole member 9 into the slide valve guide cylinder 5 is not limited to the above, and any method such as screwing, clamping using another member, or adhesion may be used.
Here, in a state where the control hole member 9 is inserted into the slide valve guide cylinder 5, the inner side of the guide hole 9a is disposed so as to face the bypass air inflow hole 6 that opens to the bottom portion 5a. 9c is arranged to open facing the first bypass air outflow hole 7a, and the second control hole 9e is arranged to open facing the second bypass air outflow hole 7b.
At this time, it is desirable that the guide hole 9a has a larger diameter than the bypass air inflow hole 6 that opens to the bottom portion 5a, and the first control hole 9c is from the first bypass air outflow hole 7a that opens to the right side wall 5b. The second control hole 9e is preferably smaller than the second bypass air outflow hole 7b opened in the right side wall 9d. However, it is not limited to the above dimensional relationship.

A cylindrical bypass valve 10 is slidably disposed in the guide hole 9 a of the control hole member 9.
The bypass valve 10 moves in the guide hole 9a along the axial direction, and the opening area of the first control hole 9c and the second control hole 9e of the control hole member 9 is controlled by the side wall 10a of the bypass valve 10. Is controlled.
M is a drive actuator that is inserted into the large-diameter hole 4b of the bypass body 4 and fixedly disposed on the bypass body 4. In this example, a step motor is used.
The output rod Ma of the step motor M protrudes upward, and a male screw is formed on the outer periphery thereof. The male screw is screwed to a female screw formed in the axial direction of the central member 10 b of the bypass valve 10.
The flange portion 10c of the central member 10b is engaged and disposed in a longitudinal groove 11a drilled in the axial direction of the fixed member 11. According to this, the output rod Ma of the drive actuator M rotates. At this time, the rotation of the central member 10b of the bypass valve 10 is suppressed, and the bypass valve 10 moves along the axial direction.
For example, when the output rod Ma rotates in the clockwise direction, the bypass valve 10 moves upward, and when the output rod Ma rotates in the counterclockwise direction, the bypass valve 10 moves downward.
In place of the step motor, the drive actuator may be a so-called wax drive type in which the output rod is moved in the axial direction by expansion or contraction of wax, or may be a manual operation such as a wire or a link.

Next, the operation will be described.
When the engine is started, an electric signal corresponding to the atmospheric state related to the engine start, such as the temperature state of the engine, the atmospheric temperature state, etc., is output from the ECU (not shown) to the step motor as the drive actuator M The step motor rotates in response to this signal.
The rotation of the step motor is transmitted to the central member 10b of the bypass valve 10 via the output rod Ma, and the rotation of the output rod Ma is converted into the axial movement of the central member 10b.
According to the above, the bypass valve 10 moves along the axial direction in the guide hole 9a of the control hole member 9 according to the operation of the drive actuator M, and the side wall 10a of the bypass valve 10 is controlled by the control hole member 9. The first control hole 9c and the second control hole 9e are controlled to have the same opening.
The bypass air supplied from the bypass air inflow hole 6 into the guide hole 9a of the control hole member 9 is controlled in the amount of bypass air by the first control hole 9c of the control hole member 9. 1 is supplied from the bypass air outflow hole 7a toward the first intake passage downstream of the first throttle valve 3a.
On the other hand, a part of the bypass air supplied into the guide hole 9a is controlled in the amount of bypass air by the second control hole 9e of the control hole member 9, and this controlled bypass air becomes the second bypass air outflow hole. 7b is supplied toward the inside of the second intake passage on the downstream side of the second throttle valve 3b.
According to the above, the first control hole 9c and the second control hole 9e of the control hole member 9 are controlled to the same opening degree by the single bypass valve 10, and the same bypass air amount is the first bypass air. The engine is supplied to the first intake passage downstream from the first throttle valve 3a and the second intake passage downstream from the second throttle valve 3b via the outflow hole 7a and the second bypass air outflow hole 7b, thereby optimizing the engine. Can perform idling operation.

Here, according to the present invention, the control of the bypass air amount toward the first and second bypass air outflow holes 7a and 7b is controlled by the first control hole 9c and the second control hole 9e formed in the control hole member 9. This is controlled by a single bypass valve 10 arranged in the control hole member 9, and according to this, the amount of bypass air toward the first and second bypass air passage holes 7a, 7b is made to be the same amount of air very accurately. Can be controlled.
That is, the first and second control holes 9c and 9e drilled in the control hole member 9 are drilled by facing the lower position by H with reference to the upper end surface 9f of the control hole member 9, At this time, the wall thickness t of the right side wall 9b and the left side wall 9d can be greatly reduced as compared with the passage length L of the conventional first and second bypass air outflow holes 7a, 7b. When the second control holes 9c and 9e are machined and formed by a drill or the like, drill runout is completely suppressed, and the first and second control holes 9c and 9e are extremely concentric and have a hole shape. Can be formed in exactly the same shape.
And since the opening degree of the first and second control holes 9c, 9e is controlled simultaneously by a single bypass valve 10, the amount of bypass air is very accurately set in the bypass air outflow holes 7a, 7b. Can supply.

Further, the guide hole 9a formed in the control hole member 9 can be formed by cutting a pipe material or a round bar, and the hole diameter accuracy of the guide hole 9a can be easily improved, and the valve 10 is slid with a certain small gap. Since it can support freely, the control precision of the bypass air amount of the 1st, 2nd control holes 9c and 9e can be improved.
Moreover, the inspection of the hole positions and hole shapes of the first and second control holes 9c and 9e of the control hole member 9 can be performed very easily.
This is because the control hole member 9 is prepared as a single member.
Further, the bypass valve 10 is slidably held by the guide hole 9 a of the control hole member 9, and the degree of freedom of material selection of the control hole member 9 is high in suppressing sliding wear with the bypass valve 10.
The conventional one is limited to a throttle body material such as aluminum.
Furthermore, the hole shapes of the first and second control holes 9c and 9e can be arbitrarily changed. This can be achieved by performing the control holes 9c, 9e of the thin side walls 9b, 9d by broaching or milling.
The ability to change the hole shape of the first and second control holes 9c, 9e in this way can optimally select a change in the bypass air amount with respect to a change in the opening degree of the bypass valve in accordance with engine demands.
Furthermore, when the first or second control hole 9c, 9e or the guide hole 9a of the control hole member 9 is processed, when a processing defect or the like occurs, only the control hole member 9 needs to be discarded. 4. Since there is no need to dispose of the throttle body 1, the cost of waste can be greatly reduced.
Furthermore, the wall thickness t of the side wall of the control hole member 9 may be about 3 millimeters. According to this, there is no need to greatly increase the inner diameter of the slide valve guide cylinder 5 into which the control hole member 9 is inserted. As a result, the size and weight increase of the conventional throttle body are small and can be easily adopted.
In this embodiment, the control hole member 9 is provided with two control holes, but the number of holes is not limited to two.

The principal part longitudinal cross-sectional view which shows one Example of the bypass air control apparatus which becomes this invention. The perspective view of the control hole member used for FIG. The longitudinal cross-sectional view in the AA of FIG.

Explanation of symbols

5 Sliding valve guide cylinder 6 Bypass air inflow holes 7a and 7b Bypass air outflow hole 9 Control hole member 9a Guide holes 9b and 9d Side walls 9c and 9e Control hole 10 Bypass valve

Claims (1)

A bypass air inflow hole and a plurality of bypass air outflow holes toward a plurality of intake passages downstream from the throttle valve are opened in the slide valve guide cylinder, and at least the bypass air outflow hole is in the slide valve guide cylinder. In a bypass air control device that is opened and closed by a bypass valve arranged in
The control hole member 9 made of a hollow annular body has a guide hole 9a penetrating in the axial direction, and a plurality of control holes 9c, 9e are concentrically drilled in the side walls 9b, 9d.
The control hole member is inserted and arranged in the sliding valve guide cylinder 5, the guide hole 9a of the control hole member 9 is opened to face the bypass air inflow hole 6, and the plurality of control holes 9c and 9e are arranged as a plurality of bypass air. Bypass air characterized in that it is arranged to open to the outflow holes 7a and 7b, the bypass valve 10 is movably disposed in the guide hole 9a, and the control holes 9c and 9e are controlled to be opened and closed by the bypass valve 10. Control device.

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