JP2002227663A - Gas flow control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas flow control device capable of easily and inexpensively assembling. SOLUTION: A throttle chamber is composed of a cylindrical shaft part 22 and a throttle body 11 provided with an insert hole 13 having the same diameter as the shaft part 22 and an intake passage 12 crossing the insert hole 13. In the crossing space 13a where the insert hole 13 and the intake passage 12 cross each other, the former includes the latter, and the shaft part 22 is turnably inserted into the hole 13. In the region of the shaft part 22 positioned in the crossing space 13a, a couple of through-holes 28 passing therethrough are formed to leave a valve element 23 continuous along the shaft core direction of the shaft part 22. In the throttle chamber, the opening or closing of the intake passage 12 using the valve element 23 is performed by turning the shaft part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas flow control device for controlling the flow rate of gas to a volume by restricting the size of a cross-sectional area of a gas flow path, and particularly to a gas flow control device for an internal combustion engine (internal combustion engine). The present invention relates to a gas flow control device for controlling a flow rate of intake air to be supplied.

[0002]

2. Description of the Related Art In general, the amount of intake air (gas: air or fuel-air mixture) supplied to an internal combustion engine is controlled by a throttle valve (throttle valve) provided in an intake passage (gas flow path). Is adjusted by changing the cross-sectional area of the flow path. Butterfly type valves are often used as throttle valves for internal combustion engines.
A rotary shaft (throttle shaft) provided in the intake passage
The valve element (throttle valve) fixed to the valve adjusts the amount of gas passing through the intake passage by rotating about the rotation axis.

[0003] By the way, various methods are employed for fixing the valve body and the rotating shaft. For example, JP-A-10-2
JP-A-52509 discloses a configuration in which a valve body is fastened to a relatively small-diameter rotating shaft using a bolt in a throttle chamber. Further, Japanese Unexamined Patent Application Publication No. 11-29420
In the resin-made throttle chamber described in Japanese Patent Publication No. 3 (1993) -213, a throttle body having an intake passage is first molded in a mold, and then a rotation shaft is inserted so as to cross the intake passage, so that it is substantially equivalent to the intake passage cross section. A secondary molding method is adopted in which a valve body having a size of?

[0004]

However, Japanese Patent Application Laid-Open No.
When assembling the throttle chamber described in Japanese Patent Application Publication No. 252509, it is necessary to perform fastening with a bolt while a rotating shaft is inserted into an intake passage of a throttle body.
This is an extremely complicated and required operation. Further, when the valve is opened, a bolt or a rotating shaft is exposed in the intake passage, so that there is a possibility that undesired turbulence causing noise may be caused in the flow of the intake air. Furthermore, since the throttle body and the valve body are made of a metal material, the demand for further weight reduction cannot be sufficiently satisfied.

On the other hand, the throttle chamber described in Japanese Patent Application Laid-Open No. H11-294203 is manufactured from a molten resin composition, and the demand for weight reduction is sufficiently satisfied. However, as described above, a throttle body having an intake passage is injection-molded in a mold, and then, using another mold and a wall surface of the intake passage, the rotation shaft inserted into the intake passage is used. A complicated manufacturing process of injection-molding a valve body in a throttle body like coating is involved, and the mold structure used is extremely complicated.

Further, in order to make the coating strength between the rotating shaft and the valve element (here, the fixing strength between them both) practically sufficient, the thickness of the valve element must be considerably larger than the diameter of the rotating axis. It is necessary to increase the size, and there is a possibility that the cross-sectional area of the intake passage when the valve is opened cannot be sufficiently secured. Further, when the thickness of the valve body is considerably large, it is necessary to provide a gap of a predetermined size between the wall surface of the intake passage and the side surface of the valve body in order to enable the rotation of the valve body. As a result, the shutoff (sealability) of the intake passage at the time of closing the valve body is reduced. On the other hand, although the thickness of the valve body can be reduced only at its peripheral portion,
Depending on the accuracy of the thinning, there is a possibility that the blocking performance of the intake passage at the time of closing the valve body may be reduced.

In addition, in assembling any of the throttle chambers described in JP-A-10-252509 or JP-A-11-294203, a valve body is fixed to a rotating shaft inserted into a throttle body. Since the process is included, even if the fixing of the valve body to the rotary shaft fails, it is not easy to remove only the completed throttle body, and it is difficult to reuse the throttle body.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a gas flow control device which can be easily and inexpensively assembled. Moreover,
It is an object of the present invention to provide a gas flow control device having a configuration capable of easily reducing noise when intake air passes through a valve body.

[0009]

In order to solve the above-mentioned problems, a gas flow control device according to the present invention includes a shaft attached to a throttle body, an insertion hole having a shape capable of inserting the shaft, And a gas flow path intersecting the insertion hole, and further, at an intersection where the insertion hole intersects the gas flow path, a throttle body formed so that the insertion hole includes the gas flow path. Including, the shaft portion is rotatably inserted into the insertion hole, and the region of the shaft portion located in the intersection portion is formed with one or more voids penetrating this region, It is configured to leave one or more continuous portions continuous along the axial direction of the shaft portion, and at least one of the continuous portions opens and closes (opens / closes) a gas flow path by rotating the shaft portion.
(Closed).

According to the above structure, the valve body is provided integrally with the shaft, and the gas flow controller (throttle chamber) is manufactured simply by inserting the shaft into the insertion hole of the throttle body. Is done. Therefore, there is no need to perform an operation such as mounting the valve body portion with the shaft portion inserted into the throttle body as in the related art, and it is possible to provide a gas flow control device that can be manufactured more easily and at lower cost.

Further, it is easy to remove the shaft portion and the throttle body after they are once assembled. Even if a defect is found in the shaft portion or the throttle body after assembling them, it is possible to remove and adjust the problem. Therefore, it is easy to reuse only a member (a shaft portion or a throttle body) having no trouble.

[0012] In the gas flow control device according to the present invention, in the above-described configuration, in the area of the shaft located in the intersection, one continuous portion passing near the axis of the shaft is provided;
It is more preferable that the gap portion is formed so as to leave two continuous portions located near the outer periphery of the shaft portion.

According to the above construction, for example, the continuous portion passing near the axis of the shaft portion having the largest area facing the gas flow path is made to function as the valve body portion, while the continuous portion is located near the outer periphery of the shaft portion. The two connecting portions can be used as connecting reinforcing portions for maintaining the rigidity of the shaft portion.

As a result, the thickness of the continuous portion functioning as the valve body can be further reduced while the rigidity of the shaft portion is sufficiently maintained, and the opening of the gas flow path when the valve body is opened can be reduced. The area can be sufficiently secured for practical use.

In the gas flow control device according to the present invention, in the above configuration, the continuous portion serving as the valve body has a flat body having two side surfaces that come into contact with the wall surface of the insertion hole when the gas flow path is closed. It may be.

"The two side surfaces of the continuous portion (flat body) serving as the valve body contact the wall surface of the insertion hole when the gas flow path is closed" means that the two side surfaces forming a pair of the continuous portion are entirely in contact with each other. Each of them refers to a state of contacting a different wall surface (also serving as an insertion hole and a wall surface of the intersection) sandwiching the gas flow path in the intersection, and at this time, the flat surface of the continuous portion intersects the gas flow path and Let the gas flow path be two intermittent spaces.

Therefore, according to the above configuration, it is possible to provide a gas flow control device having a valve body capable of closing the gas flow path with a very simple configuration.

Since the side surface of the continuous portion may be formed into a shape with a sharpened tip, the side surface of the continuous portion abutting on the wall surface of the insertion hole is a line segment (linear shape). ).

Further, the flat body may pass near the axis of the shaft portion, and a distance between the two side surfaces of the flat body may be substantially equal to a diameter of the shaft portion. In this case, the flat surface for forming the gas flow path as two intermittent spaces can be further increased, so that, for example, the cross-sectional area of the gas flow path can be further increased. .

[0020] In the gas flow control device according to the present invention, in the above structure, the evacuation space in which the at least one continuous portion is housed when the gas flow path is opened is protruded from the gas flow path inside the intersection. Is more preferably provided.

According to the above configuration, the continuous portion functioning as the valve body and / or the connection reinforcing portion can be stored in the retreat space when the gas flow path is opened, so that the gas in the gas flow path can be accommodated. Can be eliminated.

In the gas flow control device according to the present invention, in the above structure, when there is a continuous part which does not constitute the valve body, at least one of the continuous parts which does not constitute the valve body is provided. More preferably, a slit is provided.

For example, the continuous portion includes one continuous portion passing near the axis of the shaft portion and two continuous portions located near the outer periphery of the shaft portion. When only one continuous part passing through the shaft constitutes the valve body part, a slit can be provided in at least one of the two continuous parts located near the outer periphery of the shaft part.

In the gas flow control device according to the present invention, in the above configuration, it is more preferable that a rib is provided on the surface of the continuous portion facing the gap.

For example, the continuous portion includes one continuous portion passing near the axis of the shaft portion and two continuous portions located near the outer periphery of the shaft portion. When only one continuous part passing through the valve body constitutes the valve body, at least one of the two continuous parts in the vicinity of the outer periphery of the shaft part is provided with a rib on the surface facing the gap. be able to.

Further, a rib may be provided on the surface of the continuous portion serving as the valve body facing the gap.

According to any of the above configurations, the ribs and slits control the flow of gas in the gas flow path, so that noise generated when the gas flow path is switched from closed to open can be reduced. It becomes possible.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following will describe one embodiment of the present invention with reference to the drawings. Needless to say, the present invention is not particularly limited only to the description of the present embodiment.

The throttle chamber (gas flow controller) according to the present embodiment is connected between a gas supply source and a gas supply destination to control the supply of gas to the gas supply destination. Mechanism. In the following description, a throttle chamber for controlling a supply amount of intake air (air or fuel-air mixture) to an internal combustion engine will be described as an example.

The above-mentioned throttle chamber is shown in FIG.
2 (c) and FIG. 2, a shaft member (throttle shaft) 21 is inserted into the throttle body 11 (see FIG. 1 (b)), and both are connected using a snap ring (not shown) or the like. It was done. For example, the throttle body 11 and the shaft member 21 can be connected by fitting a snap ring to a shaft portion of the shaft member 21 on the sensor connection portion 27 side. As will be described later, the shaft portion 22 of the shaft member 21 has a valve body (valve).
23 are provided integrally, and can be easily and inexpensively assembled without the need for an operation of fastening the valve body and the rotating shaft with bolts or the like as in the conventional configuration. Note that FIG.
FIG. 1B shows a state where the shaft member 21 is assembled in the throttle body 11 and is cut along the line AA ′ shown in FIG.

The throttle body 11 has a substantially cubic shape, and a sensor connecting portion 27 (described later) of the shaft member 21 extends from one of its side surfaces to the side surface opposite thereto.
Receiving hole 13b for receiving the
And an insertion hole 13 having a diameter (inner diameter) substantially equal to a shaft diameter of a shaft portion 22 (described later) of the shaft member 21. On the other hand, in the throttle body 11, a single intake passage (gas flow path) 12 having a predetermined diameter (inner diameter: bore diameter of the throttle body) is provided between the two side surfaces where the receiving hole 13b and the insertion hole 13 are not open. Is provided. Further, the intake passage 12
One opening has a connector portion 12a for connection to an intake supply source (gas supply source), and the other opening has a connector portion 12b for connection to, for example, an intake manifold (not shown). Is connected.

The above-described intake passage 12 and the insertion hole 13 are orthogonal to each other in the vicinity of the center of the throttle body 11 to form an intersection space (intersection) 13a. As described later, the intersection space 13
The valve body 23 of the shaft member 21 is located at a and switches between opening and closing of the intake passage 12 (communication between the connector 12a and the connector 12b and switching off).

The shaft member 21 includes a cable receiving portion 26 having an annular groove in the center of the side surface, a cylindrical spring receiving portion 25, a substantially cylindrical shaft portion 22, and a substantially cylindrical sensor connecting portion 27. Are one-piece products in which the respective axes are aligned and arranged in this order. Further, the cable receiving portion 26, the spring receiving portion 25, the shaft portion 22, and the sensor connecting portion 27
Each diameter is designed to decrease in turn. In the throttle chamber according to the present embodiment, the shaft member 21 is inserted through the opening 13 c of the insertion hole 13 of the throttle body 11, the sensor connecting portion 27 is inserted into the receiving hole 13 b, and the shaft portion 22 is inserted into the insertion hole 13. Is configured to be accepted.

The annular groove of the cable receiving portion 26 receives driving force supplied from a power source (not shown) in the shaft member 21.
A cable (not shown) for transmitting the data is passed over the cable. When the driving force is transmitted from the power source, the shaft member 21 (the shaft portion 22) is rotationally driven in one direction (referred to as a rotation direction) in the throttle body 11.

On the other hand, the shaft member 21 is fixed to the spring receiving portion 25 at a steady position (a position at which the intake passage is closed by the valve body portion 23; described later), while the shaft member 21 is fixed in the rotation direction. When driven, a spring (biasing member) 25a for biasing the shaft member 21 in a direction opposite to the rotation direction is wound. Thus, when the supply of the driving force to the cable is stopped, the shaft member 21 that has been rotated in the rotation direction rotates in the opposite direction, and is fixed at the steady position. That is, the shaft member 21 is rotationally driven in two directions by a driving mechanism of the shaft member 21 including a spring 25a, a cable, and a power source. The cable and the spring 25a
Since the rotation driving method using the above is also adopted in the conventional throttle chamber, its detailed description is omitted.

As shown in FIG. 2, ring seals (shaft seals) 14 are provided on the inner surface side of the throttle body 11 in contact with the outer surface of the shaft member 21 to seal the shaft member 21 from the throttle body 11. (Sealing)
Has been improved. In particular, since it is necessary to suppress the leakage of intake air (gas) from the insertion hole 13 or the reception hole 13b shown in FIG.
It is more preferable that one is provided so as to abut the shaft portion 22 and the other is provided so as to abut the sensor connecting portion 27 with the intersecting space 13a interposed therebetween.

On the opening side of the receiving hole 13b in the throttle body 11, a sensor 31 for reading the rotation angle of the shaft member 21 is provided. This sensor 31
Is inserted with a rectangular parallelepiped protruding end 27a of the sensor connecting portion 27, and reads rotation information of the protruding end 27a.

The valve body (valve: connecting part: continuous part) 23 provided on the shaft member 21 and the opening / closing operation of the intake passage 12 using the valve body 23 will be described in detail below.

The central part of the shaft member 21, specifically,
In the region of the shaft portion 22 located in the intersection space 13a, two through holes (gap portions) penetrating this region in the diameter direction of the shaft portion 22 (that is, the direction intersecting (perpendicular to) the extension direction of the shaft portion 22). 28, 28 are formed. In the state shown in FIG. 1A (when the valve is open), the curved surfaces of the through holes 28 correspond to the intake passages 12 extending into the intersection space 13a. That is, in the present embodiment, the diameter of the insertion hole 13 (substantially the same as the diameter of the shaft portion 22) is designed to be larger than the diameter of the intake passage 12.

As a result of the provision of the through holes 28, the valve body 23 located at the center and the valve body 23 sandwiching the through holes 28 are located in the region of the shaft portion 22 located in the intersection space 13a. Two connecting reinforcing portions (continuous portion: outer connecting portion) 24 and 24 facing the portion 23 are left. The valve body portion 23 and the connection reinforcing portions 24 are each formed in a continuous shape along the axial direction of the shaft portion 22, and are integrated (continuity) along the axial direction of the shaft member 21. Is maintained.

The pair of through holes 28 and the pair of connection reinforcing portions 24 are provided symmetrically with the valve body 23 interposed therebetween. The through holes 28 are holes extending in the same direction. Further, the region of the shaft portion 22 where the through holes 28 are not formed may have a hollow cylindrical shape.

The valve body 23 is a substantially flat body in which the axis of the shaft 22 passes through the center thereof and has a two-dimensional spread along the axis and the diameter of the shaft 22. .
Further, since the two side surfaces constitute the outer peripheral surface of the shaft portion 22, the distance between these two side surfaces (the dimension along the diameter direction of the shaft portion 22) is the same as the diameter of the shaft portion 22. In addition,
The two side surfaces are actually curved surfaces, but can be regarded as substantially flat surfaces (including linear ones). this is,
This is because the valve body 23 is formed to be relatively thin (for example, about 1.0 mm to 4.0 mm) so as not to hinder the flow of intake air.

Hereinafter, the opening and closing operation of the intake passage 12 using the valve body 23 will be described in detail with reference to FIGS.

First, when the intake passage 12 is opened (when the valve is opened), as shown in FIGS. 3A and 3B, the flat surface (valve surface) of the valve body 23 is The shaft member 2 extends along the extension direction (the flow direction of the intake air).
1 is rotated. Thereby, the intake passages 12 located before and after the intersection space 13a communicate with each other through the through holes 28, and the intake air flowing from the connector portion 12a side can flow out to the connector portion 12b side. That is, the through holes 28 are designed to form a part of the intake passage 12 when the valve is opened.

On the other hand, when closing the intake passage 12 (when the valve is closed), the transmission of the rotational driving force to the shaft member 21 is cut off, and as shown in FIGS. Part 2
3 is fixed in the stationary position. That is, the shaft member 2
1 (shaft portion 22) rotates counterclockwise from the state shown in FIG. 3A by the urging force of the spring 25a (see FIG. 2), and stops in the state shown in FIG. 3C. At this time,
The flat plate-shaped valve portion 23 has its entire two side surfaces in contact with the inner wall surface of the throttle body 11 and functions as a wall that blocks the intake passage 12 into two spaces. As a result, the flow of intake air from the connector 12a to the connector 12b is completely shut off. The inner wall surface with which the entire side surface of the valve body portion 23 comes into contact is a different wall surface that sandwiches the intake passage 12 in the intersection space 13a.
And also serves as a wall surface of the intersection space 13a.

FIGS. 3A and 3C show the intersection space 13.
3A and 3D show a state in which the vicinity of the intersection space 13a is viewed along the direction in which the intake passage 12 extends, and FIGS. However, the valve body 23 is provided such that both ends thereof (both ends on the axial center side) substantially coincide with both ends of the intake passage 12 (see FIG. 3B). In addition, when the valve is opened, the curved portions of the through holes 28 are designed to match the wall surfaces of the intake passage 12, so that the cross-sectional size of the intake passage 12 is not substantially reduced.

Further, as in the conventional throttle chamber, when the valve is opened, the valve body 23 is located in the intake passage 12, but the valve body 23 is provided integrally with the shaft 22. There is no expression such as bolts that obstruct the flow of intake air. Further, as compared with a conventional configuration in which a valve body (valve body portion) is formed so as to cover the rotating shaft, the simplicity of the molding surface is excellent, and the thickness of the valve body portion can be further reduced. . In particular, in the configuration shown in FIGS. 1 to 3, since the connection reinforcing portions 24 are left near the outer periphery of the shaft portion 22, the valve body portion 23 is held while sufficiently maintaining rigidity in the intersection space 13 a. It is possible to further reduce the wall thickness and sufficiently secure the opening area when the valve is opened.

Further, the side surface of the valve body portion 23 facing the flow of the intake air when the valve is opened and the side surface of the valve body portion 23 located at the latter stage of the flow are machined into a tapered shape with a sharpened tip. (FIG. 3A), it is also possible to make the flow of intake air smooth.

In the intersection space 13a,
The intake passage 12 is included in the insertion hole 13 (FIG. 3).
(See (a)) In other words, it is necessary to design the intersection space 13a so that the diameter (maximum diameter) of the intersection space 13a is equal to the diameter of the insertion hole 13. In addition, the term “enclosed” means that the diameter of the intake passage 12 and the diameter of the insertion hole 13 are equal and both occupy the same height space in the throttle body 11 (the respective cores). In the center of the intersection space 13a). Hereinafter, the intersection space 13a
In the following, the necessity of including the intake passage 12 in the insertion hole 13 will be described.

As described above, the rotation diameter (distance between two side surfaces) of the valve body 23 is the same as the diameter of the shaft 22. Therefore, when the diameter (maximum diameter) of the intersecting space 13a exceeds the diameter of the shaft portion 22 (in this embodiment, the same as the diameter of the insertion hole 13), the valve body 23 blocks the intake passage 12. May not be possible. The case where the diameter of the intersection space 13a exceeds the diameter of the shaft portion 22 includes, for example, when the diameter of the intake passage 12 in the intersection space 13a is larger than the diameter of the insertion hole 13.

In the throttle chamber according to the present embodiment, the intake passage 12 having a diameter smaller than the diameter (maximum diameter) of the intersection space 13a is provided so that the pipe core passes through the center of the intersection space 13a (see FIG. 4). FIG. 3A). As a result, an evacuation area (evacuation space) that is convex (projects) from the intake passage 12 is provided above and below the intersection space 13a.
Is formed. When the valve is opened, the connection reinforcing portions 24 are accommodated in the retreat area for the purpose of reducing the risk of obstructing the flow of the intake air. In addition, by making the sectional shape of the evacuation area and the sectional shape of the connection reinforcing portion 24 coincide with each other, as shown in FIG. Is also possible.

By providing the retreat area, it is possible to further improve the shut-off property of the intake passage 12 when the valve is closed. More specifically, with reference to FIG. 3C, as long as one side surface of the valve body portion 23 (which comes into contact with the region A in the figure) is located between the region A and the region B, the intake passage 12 Is cut off, so that it is possible to provide a margin in design accuracy.

Further, the valve body 23 is fixed in a state inclined with respect to the flow direction of the intake air to shut off the intake passage 12 (FIG. 3 (c)). The body part 23 is rotated to open the intake passage 12 (FIG. 3).
In the method (a), when the valve is closed, the flow of the intake air immediately after the valve is opened can be further improved as compared with the conventional method in which the valve body is positioned perpendicular to the flow direction of the intake air. Become.

When the valve is closed, the valve body 23 is closed.
Before and after the connection reinforcing portions 24, 24 are positioned so as to partially block the intake passage 12.
24 serves to control the flow of intake air flowing into the intake passage 12 as the valve body 23 opens. For this reason, it is possible to reduce the passing noise (intake noise) of the intake air, which is generated when the valve body portion 23 is suddenly fully opened.

The valve body 23 and the connection reinforcement 24
Reference numeral 24 denotes a part of the cylindrical shaft part 22, and a part thereof slides on the wall surface of the insertion hole 13 when the shaft member 21 rotates. That is, in the present embodiment, the shaft portion 22 does not have a structure protruding outside the cylindrical outer peripheral surface, and can be assembled after the throttle body 11 and the shaft member 21 are separately manufactured. Also, throttle body 1
Since it is easy to remove the shaft member 21 from the shaft member 1, even if a defect is found during or after assembling,
Both can be removed to adjust the malfunction.

Throttle body 11, shaft member 21
The material constituting the resin and the method for producing the same are not particularly limited, but the molten resin composition is injected from the viewpoint that it is excellent in weight reduction, heat insulation effect, ease of production, and freedom in shape design. The method of molding is generally preferred. Generally, light metals such as aluminum used for manufacturing a throttle chamber can be used without any particular limitation.

As the molten resin composition, a conventionally known molten resin (synthetic resin in a molten state) used for manufacturing a throttle chamber, and various additives (for example, various reinforcing fibers) are added to the molten resin. Compositions can be used. Examples of the molten resin include amide-based resins such as polyamide, polyester-based resins, and the like, and those obtained by mixing appropriate amounts of reinforcing fibers such as carbon fiber and glass fiber with these molten resins are particularly preferable. It is mentioned as an example of the composition.

The constituent members forming the throttle chamber according to the present embodiment have a shape that can be easily formed, and can be manufactured by diverting a known method. Therefore, description of the manufacturing method including the manufacturing conditions will be omitted.

In the throttle chamber according to the present invention,
A plurality of ribs 41 may be provided on both surfaces (valve surfaces) of the valve body portion 23 facing the through holes 28 (see FIGS. 4A to 4D). Each of the ribs 41 extends along the diametrical direction of the shaft portion 22 and, when the valve is opened, extends along the flow direction of the intake air (see FIG. 4A). These ribs 41 function as rectifying blades (rectifying members) for rectifying the flow of intake air, and are opened when the intake passage 12 is opened (particularly when the valve body 23 is fully opened).
, The occurrence of intake noise can be further reduced.

In order to further reduce the generation of intake noise, as shown in FIGS. 5 (a) to 5 (d), the connection reinforcing portions (continuous portions) 24 It is more preferable to provide a plurality of ribs 41 on the surface on the side of the side (that is, the inner wall surface of the through hole 28). These ribs 4
Are also extended along the diametric direction of the shaft portion 22,
When the valve is opened, it follows the flow direction of the intake air.

In the throttle chamber according to the present invention, as shown in FIGS. 6 (a) to 6 (d), a plurality of slits 42 are provided in a part of the connection reinforcing portions 24 to form a comb shape. The turbulence of the intake air flowing when the valve is opened may be controlled. As in the case where the ribs 41 are provided,
This configuration also makes it possible to suppress the generation of intake noise. The slits 42 may be provided, for example, in a region of the connection reinforcing portion 24 protruding into the intake passage 12 when the valve is closed (see FIG. 6C).

In addition to the configuration shown in FIGS. 6A to 6D, a plurality of ribs 43 are provided on both surfaces (valve surfaces) of the valve body 23 facing the through holes 28. (See FIGS. 7A to 7D.) In addition, the rib 43 ...
The extension direction of the rib 41 shown in FIGS.
, But is provided only at the upper end on the upper surface side and the lower end on the lower surface side where the flow of the intake air first hits when the valve body portion 23 inclined with respect to the intake passage 12 is opened at the time of closing. I have.

The number and size of the ribs 41 and 43 and the slits 42 are not particularly limited, and the flow of the intake air when the valve is opened is not obstructed, and the generation of the intake noise can be suppressed. Should be set to. Also, the rib 41
The installation position in the case where 43 is provided may be any surface of the valve body portion 23 or the connection reinforcing portions 24, 24 on the side facing the through holes 28, 28, and the installation position in the case of providing the slit 42. May be any of the connection reinforcing portions 24. Needless to say, since the valve body 23 blocks the space, the slit 42 cannot be provided.

In the throttle chamber according to the present invention, a shaft member 21a shown in FIG. 8A or a shaft member 21b shown in FIG. 8B is used instead of the shaft member 21 shown in FIG. It is also possible.

The shaft member 21a has a structure in which the connection reinforcing portions 24 and 24 are removed from the shaft portion 22 of the shaft member 21 as the shaft portion 22a, and the shaft member 21a is formed as a gap extending through the shaft portion 22a in the same direction. Two concave spaces 28a, 28
a. The shaft member 21 a is inferior in strength to the shaft member 21 because there is no connection reinforcement 24. However, for example, when the diameter of the intake passage is substantially the same as the diameter of the insertion hole, there is an advantage that a larger opening area of the intake passage can be ensured when the valve is opened.

On the other hand, the shaft member 21b is
Are formed as voids penetrating along the same direction, and are disposed above and below the through-hole 28c with one through-hole 28c passing through the vicinity of the shaft center and part of the shaft 22b (valve bodies 23a, 23a). And two concave spaces 28b. Since the two side surfaces of the valve body portions 23a and 23a left between these void portions are part of the cylindrical outer peripheral surface of the shaft portion 22b, they correspond to the wall surface of the insertion hole 13 (see FIG. 1B). In contact, it becomes a valve. Further, since the valve body portion 23a is formed near the axis of the shaft portion 22b, the distance between the two side surfaces can be regarded as substantially equal to the diameter of the shaft portion 22b.

In the throttle chamber according to the present invention, it is also possible to adopt the main configuration shown in FIGS. 9 (a) to 9 (f). 9 (a) to 9 (f) are views for explaining a state where the intersection space 13a is viewed from the direction along the extension direction of the insertion hole 13 shown in FIGS. 1 (a) to 1 (c). is there.

A modified example of the throttle chamber shown in FIGS. 9A and 9B is a shaft member 21a shown in FIG.
In addition, a structure in which two connection reinforcing portions 24a are provided vertically above and below the valve body portion 23 is used. Each of the valve body 23 and the connection reinforcing parts 24a is a flat plate, and is arranged parallel to each other and at a constant interval. The connection reinforcing portions 24a are continuous portions that cross the inside of the intersection space 13a (see FIGS. 1A to 1C) along the extension direction of the shaft portion, but are sufficient to close the intake passage 12. Does not have a size.

The connection reinforcing portions 24a, 24a
2 is open (see FIG. 9 (a)), the flat surface is arranged along the direction of extension of the intake passage 12, so that the rigidity of the shaft portion is complemented and the intake air It also functions as a rectifying member for rectifying the flow. Further, the intake passage 12 is closed by the valve body 23 (see FIG. 9B).

In the modified example of the throttle chamber shown in FIGS. 9C and 9D, in the shaft member 21 (FIG. 1C), the curved surface portions of the connection reinforcing portions 24 are larger (or the intake passages). 12 is smaller), and this new connection reinforcing portion 24b functions as a valve body. In addition, since the valve body 23 shown in FIG. 1C is not required, the installation position is the same, and a continuous part 23a 'having a shorter length along the diameter direction is provided instead.

When the intake passage 12 is opened (see FIG. 9C), the continuous portion 23a 'is arranged such that its flat plate surface extends along the direction in which the intake passage 12 extends, and the rigidity of the shaft portion is increased. And a rectifying member that rectifies the flow of intake air. Also, the connection reinforcing portion 24b
When the intake passage 12 is opened, the evacuation area (evacuation space) 13 in the intersection space 13a shown in FIG.
a ′ 13a ′, while the intake passage 1
At the time of closing 2, the curved surface portion contacts the upper and lower wall surfaces of the intersecting space 13a to form a valve. Note that the continuous portion 23a 'may be omitted, or two or more continuous reinforcing portions 24b may be provided between the connection reinforcing portions 24b.

The modification of the throttle chamber shown in FIGS. 9 (e) and 9 (f) is a flat plate-like connection reinforcing portion 24c which is obtained by removing the curved surface portion of the connection reinforcing portion 24b (FIG. 9 (c)).
c (a flat plate) functions as a valve body.
The connection reinforcing portion 24c when opening and closing the intake passage 12
Are the same as those of the connection reinforcing portion 24b, and the description is omitted. Flat continuous portions 23b are formed between the connection reinforcing portions 24c so as to be substantially parallel to the connection reinforcing portions 24c. The continuous portions 23b are provided along the direction in which the intake passage 12 extends when the intake passage 12 is opened, and function as a connection reinforcing portion and as a rectifying member for rectifying the flow of intake air.

[0073]

As described above, the gas flow control device according to the present invention includes the shaft, the insertion hole into which the shaft is rotatably inserted, and the gas flow path intersecting the insertion hole. Including the throttle body, the region of the shaft portion located in the intersection of the insertion hole and the gas flow path is formed with a void so that a continuous portion continuous along the axis of the shaft portion is left. The continuous portion constitutes a valve body that opens and closes the gas flow path by rotating the shaft.

According to the above configuration, the valve body is provided integrally with the shaft, and the gas flow control device is manufactured only by inserting the shaft into the insertion hole of the throttle body. That is, there is an effect that it is possible to provide a gas flow control device that can be easily and inexpensively manufactured.

In the gas flow control device according to the present invention, in the above structure, one continuous portion passing near the axis of the shaft portion is provided in a region of the shaft portion located in the intersection.
It is more preferable that the gap portion is formed so as to leave two continuous portions located near the outer periphery of the shaft portion.

According to the above configuration, it is possible to further reduce the thickness of the continuous portion functioning as the valve body while maintaining the rigidity of the shaft portion sufficiently, and it is possible to reduce the gas flow when the valve body is opened. This has an effect that the opening area of the path can be sufficiently secured for practical use.

Further, the continuous portion serving as the valve portion may be a flat plate having two side surfaces which come into contact with the wall surface of the insertion hole when the gas flow path is closed. The gas flow control device having a valve body capable of closing the gas flow path with a simple configuration can be provided.

In the gas flow control device according to the present invention, in the above structure, an evacuation space is provided in the intersection portion, the evacuation space protruding from the gas flow path and accommodating the continuous portion when the gas flow path is opened. Is more preferable.

According to the above configuration, it is possible to eliminate the possibility that the gas flow in the gas flow path is hindered by the continuous portion.

In the gas flow control device according to the present invention, in the above configuration, it is more preferable that at least one of the continuous portions not forming the valve element is provided with a slit. It is more preferable that the rib is provided on the surface facing the portion.

According to the above configuration, since the ribs and the slits control the flow of gas in the gas flow path, it is possible to reduce noise generated when the gas flow path is switched from closed to open. The effect is added.

[Brief description of the drawings]

1A and 1B show a configuration of a throttle chamber (gas flow control device) according to an embodiment of the present invention, wherein FIG. 1A is a perspective view thereof, FIG. () Is a perspective view of a shaft member constituting the throttle chamber.

FIG. 2 is a sectional view showing a schematic configuration of a throttle chamber shown in FIG.

FIGS. 3 (a) to 3 (d) are views for explaining an open / close state of an intake passage in the throttle chamber shown in FIG. 1;

4 (a) to 4 (d) are diagrams for explaining an open / close state of an intake passage in a modified example of the throttle chamber shown in FIG. 1;

FIGS. 5 (a) to 5 (d) are views for explaining an open / close state of an intake passage in another modification of the throttle chamber shown in FIG. 1;

FIGS. 6 (a) to 6 (d) are views for explaining an open / close state of an intake passage in still another modified example of the throttle chamber shown in FIG.

FIGS. 7 (a) to 7 (d) are diagrams for explaining an open / close state of an intake passage in still another modified example of the throttle chamber shown in FIG. 1;

FIGS. 8A and 8B are perspective views showing a schematic configuration of another shaft member that can constitute a throttle chamber of the present invention.

9 (a) to 9 (f) are diagrams showing the open / closed state of the intake passage in still another modified example of the throttle chamber shown in FIG. 1 from the direction along the extending direction of the insertion hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Throttle body 12 Intake path (gas flow path) 13 Insertion hole 13a Intersection space (intersection) 13a 'Evacuation area (evacuation space) 22 Shaft part 22a Shaft part 22b Shaft part 23 Valve body part (continuous part: flat body) 23a Valve part (continuous part: flat body) 23a 'Continuous part (connection reinforcement part) 23b Continuous part (connection reinforcement part) 24 Connection reinforcement part (continuous part) 24a Connection reinforcement part (continuous part) 24b Connection reinforcement part (continuous part) : Valve body part) 24c connection reinforcing part (continuous part: flat body: valve body part) 28 through hole (gap part) 28a concave space (gap part) 28b concave space (gap part) 28c through hole (gap part) 41 rib 42 slit 43 rib

Claims (6)

[Claims] A shaft portion attached to a throttle body; an insertion hole having a shape into which the shaft portion can be inserted; and a gas flow path intersecting the insertion hole. And a throttle body formed so that the insertion hole includes a gas flow path. The shaft portion is rotatably inserted into the insertion hole, and The region of the shaft portion located in the intersection portion is configured such that one or more void portions are formed through the region, and one or more continuous portions continuous along the axial direction of the shaft portion are left. A gas flow control device, wherein at least one of the continuous portions constitutes a valve body that opens and closes a gas flow path by rotation of the shaft portion. 2. In the region of the shaft located in the intersection, one continuous portion passing near the axis of the shaft and two continuous portions located near the outer periphery of the shaft are provided. The gas flow control device according to claim 1, wherein the gap is formed so as to leave a gap. 3. The continuous portion serving as the valve body portion is a flat plate having two side surfaces that come into contact with the wall surface of the insertion hole when the gas flow path is closed. 3. A gas flow control device according to claim 1. 4. An evacuation space which protrudes from the gas flow path and which houses at least one of the continuous parts when the gas flow path is opened is provided in the intersection. The gas flow control device according to any one of claims 1 to 3. 5. A slit is provided in at least one of the continuous portions that do not form the valve body portion when there is a portion that does not form the valve body portion among the continuous portions. The gas flow control device according to any one of claims 4 to 7. 6. A rib is provided on a surface of said continuous portion on a side facing said gap.
The gas flow control device according to any one of claims 1 to 4.