JPH089413Y2 - Intake air connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement of an intake air connector.

INDUSTRIAL APPLICATION This invention can be utilized for the intake air connector which sends the air from the air filter used for a gasoline engine etc. to the fuel injection apparatus which connects to an intake manifold.

(Prior Art) A conventional intake air connector is shown in a plan view in FIG.
As shown in Fig.8, the cross section taken along the vertical plane
The whole is a bent tubular body integrally molded. And a cylindrical inlet portion 101 forming the air inlet 100 at one end and an outlet portion 104 having an air outlet 104 at the other end and having a flange portion 1
With 03. Since this intake air connector is integrally molded, the inner wall surface forming the passage has a corner portion 102 that is bent at a right angle.

Further, the intake and exhaust pipes of the internal combustion engine described in Japanese Utility Model Publication No. 47-13620 have a wide plate provided with an exhaust hole and a plurality of bolt holes, and a plate body having a diameter gradually increasing in the extension direction of the pipe, and one of the plates. This is formed by press-molding a curved plate body having a substantially semicircular cross section with its ends sealed, and integrally joining the both.
This intake / exhaust pipe has a groove with a wedge-shaped cross section on the inner wall surface that constitutes the passage through which air passes, and the exhaust hole opens on a flat wall surface, and the inner wall surface forming the exhaust hole is a corner bent at a right angle. ing.

(Problems to be solved by the invention) Since these conventional intake air connectors and intake / exhaust pipes have corners that are bent at right angles to the inner wall surface that forms a passage for guiding air, the air passing through the passage is disturbed at the corners. Therefore, there is a problem that the air flow is disturbed and the air resistance is increased.

Further, in the intake air connector completed by joining the two members, while ensuring the flow rate at the air introduction port,
Unless the joining force of the members is improved, it may not be able to endure severe use.

Furthermore, in the intake air connector, without disturbing the flow of the air before being mixed with gasoline introduced from the air inlet, it is necessary to stop the moisture and dust in the air.
It is difficult to achieve stable combustion.

(Object of the Invention) The present invention has been devised in view of the above problems, and has an inner wall surface that forms a passage through which air is smooth, can be molded, and is easily manufactured, and can withstand harsh use. It is an object of the present invention to provide an intake air connector that can achieve stable combustion at the same time.

[Structure of the Invention] (Means for Solving the Problems) An intake air connector of the present invention has a lower inlet portion forming a lower portion of an air inlet at one end, and a shape formed integrally with the lower inlet portion. And a short tubular outlet having an air outlet that is integrally formed at the other end of the lower barrel and has an air outlet opening in a direction intersecting the direction in which the lower barrel extends. A molded lower member in which the lower inner surface formed by the inner surfaces of the lower inlet portion, the lower body portion, and the outlet portion is a smooth continuous curved surface, and the upper portion of the air inlet port is formed at one end. The upper entrance to
The upper inner portion formed integrally with the upper inlet portion and including the lower body portion and the upper body portion in the shape of an inverted veil that covers the outlet portion, and the upper inner surface formed by the inner surfaces of the upper inlet portion and the upper body portion An upper member which is formed by molding and has a smooth continuous curved surface, the lower inner surface and the upper inner surface are continuous with each other when the lower member and the upper member are connected to each other, and the air from the air filter is provided at one end. Has an air introduction port for introducing air, and the other end has the air discharge port for sending air to a fuel injection device communicating with the intake manifold, and the lower inlet portion has a semicircular cross-section and a U-shaped cross-section. A tube having a lower insertion end at the tip, and arcs extending upward linearly from both ends in the width direction as it goes inward from the lower insertion end, and the width direction of the lower body becomes a linear bottom. -Shaped bottom part, and the upper inlet part is the lower insertion end. It characterized by having the tip of the upper entry end having a substantially plane symmetry with.

The lower member constituting the intake air connector of the present invention is composed of one split mold which mainly forms the lower inner surface and a part of the outer surface of the outlet portion, and the lower outer surface facing the lower inner surface and a portion of the inner surface of the outlet portion. It is possible to mold with a pair of split dies consisting mainly of the other split dies. Similarly to the lower member, the upper member is also molded by a pair of split molds including one split mold that mainly forms the upper inner surface and the other split mold that mainly forms the upper outer surface facing the upper inner surface. be able to.

Further, the lower body portion of the lower member has a bottom portion whose width direction is linear, and lower lower portions which rise from both side ends of the bottom portion, respectively.
It is preferable to have a dish-shaped cross section consisting of lower flange portions at the upper ends of the respective lower side portions and protruding in a direction away from each other.

Similarly, the upper body portion of the upper member has a linear top in the width direction, high upper side portions extending downward from both side ends of the top portion, and lower end portions of the upper side portions protruding in directions away from each other. It is preferable to have a trapezoidal cross section composed of a lower flange portion and an upper flange portion that is abutted and joined.

(Operation) In the intake air connector of the present invention, the inner wall surface forming the air passage is a smooth continuous curved surface, and there are no corners and wedge-shaped grooves on the inner wall surface, so that the air passing through the air passage is less likely to be disturbed. . Therefore, the flow of the air guided from the air inlet can be stably sent to the air outlet without being disturbed. Therefore, the air resistance of the air passing through the air passage can be reduced.

Further, the intake air connector of the present invention employs a lower inlet end having a lower insertion end having a semicircular cross section and a U-shaped inner cross section at the tip, and is substantially plane-symmetrical with the lower insertion end. Since the upper inlet having the upper insertion end formed at the tip is adopted, a wide welding width between the upper member and the lower member is ensured while ensuring the flow rate at the divided air introduction ports.

Further, in the intake air connector of the present invention, the lower inlet part has a circular arc extending linearly upward from both ends in the width direction from the lower insertion end part to the inner side, and the lower body part has a linear bottom part in the width direction. Since it has a cylindrical bottom part, the bottom part is located above the lower insertion end part, and it does not disturb the flow of air before mixing with gasoline introduced from the air introduction port, without disturbing moisture and dust in the air. Can be stopped.

Also, if there is a height difference between the upper side of the upper member and the lower side of the lower member, the upper member and the lower member are joined together to prevent the inner warp of the higher side from being lowered. To be done.

Further, when the flange portion is provided at the end portion of each member, reverse warp of each member can be prevented.

(Embodiment) An embodiment of the intake air connector of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a lower member of the intake air connector of the present invention. 2 is a partial sectional front view of the intake air connector, and FIG. 3 is a partial sectional side view thereof. Further, FIGS. 4, 5, and 6 are end views of AA, BB, and CC of FIG. 2, respectively.

The intake air connector of this embodiment integrally includes a lower member 1 obtained by injection molding synthetic resin with a pair of split molds and an upper member 2 obtained by similarly molding. It is manufactured by joining. An air inlet 3 for introducing air is opened at one end of the intake air connector, an air outlet 5 for discharging air is opened at the other end, and an air guide path 4 is connected between the two.

As shown in FIG. 1, the lower member 1 is composed of a lower inlet portion 11, a lower body portion 12, and an outlet portion 13.

The lower inlet portion 11 constitutes the lower side of the air inlet 3.
Further, as shown in FIG. 3, the lower inlet portion 11 has a lower insertion end portion 111 having a semicircular cross section and a U-shaped inner cross section at the tip, and as shown in FIGS. 4 and 5. Further, it has a cylindrical bottom portion 112 in which an arc extends linearly upward from both ends in the width direction from the lower insertion end portion 111 toward the back. The tubular bottom portion 112 becomes a bottom portion 121 which will be described later and whose width direction is linear as shown in FIG. 6 as it goes further inward.

As shown in FIG. 1, the lower body portion 12 has a shape that is integrally formed with the lower inlet portion 11. Also this lower torso
As shown in FIG. 6, 12 has a bottom portion 121 that is linear in the width direction.
And the lower lower side portions 1 that rise from both ends of the bottom portion 121, respectively.
22 and a lower flange portion 123 at the upper ends of these lower side portions 122 and projecting away from each other, and has a dish-shaped cross section. Since the bottom portion 121 is located above the lower insertion end portion 111 as shown in FIG. 2, moisture, dust and the like in the air are retained at the lower insertion end portion 111, and the fuel injection device and further It is hard to let it flow into the engine. Further, as shown in FIG. 1, the lower body portion 12 is a first bent portion gently bent to the right by 90 ° in the extension direction.
Below 4a and further down in the direction of extension as shown in FIG.
And the lower side of the second bent portion 4b bent gently by 90 °.

The outlet portion 13 is a short tubular shape that is integrally formed on the other end side of the lower body portion 12 and has an air outlet 5 that opens in a direction intersecting with the extending direction of the lower body portion 12. The air outlet port 5 of the outlet portion 13 gently guides air from the upper side to the lower side as the second bent portion 4b is bent. Since the opening area of the air outlet port 5 is formed larger than the cross-sectional area of the air guide passage 4, the noise from the fuel injection device connected to the air outlet port 5 can be reduced by the change of the cross-sectional area. Further, as shown in FIG. 1, there is a narrowed portion 4c between the outlet portion 13 and the lower body portion 12 whose cross-sectional area is slightly smaller than that of the peripheral portion. Therefore, the noise from the fuel injection device can be reduced similarly to the opening area of the air outlet 5. The outlet portion 13 has three mounting bolt holes 16a, 16b, 16c.

The lower inner surface 1P formed by the inner surfaces of the lower inlet portion 11, the lower body portion 12 and the outlet portion 13 is a smooth continuous curved surface and is below the air guide passage 4.

As shown in FIG. 2, the lower surface of the lower member 1 has a protruding portion 17a having a bolt hole for mounting between the lower body portion 12 and the lower inlet portion 11, and an air intake portion slightly behind the protruding portion 17a. It has a protrusion 17b having an inlet hole and a protrusion 17c having an air intake hole on the lower surface of the first bent portion 4a of the lower body portion 12.

On the other hand, the upper member 2 has an upper inlet portion 21 as shown in FIG.
And an upper body portion 22.

The upper inlet portion 21 constitutes above the air inlet 3.
Further, the upper inlet portion 21 has an upper insertion end portion 211 which is substantially plane-symmetrical to the lower insertion end portion 111 of the lower member 1 as shown in FIG.

As shown in FIGS. 2 and 3, the upper body portion 22 is formed integrally with the upper inlet portion 21 and has an inverted shape that covers the lower body portion 12 and the outlet portion 13. Further, as shown in FIG. 6, the upper body portion 22 has a top portion 221 which is linear in the width direction, and upper side portions 222 which extend downward from both side ends of the top portion 221.
And an upper flange portion 223 which is located at the lower ends of these upper side portions 222, protrudes in a direction away from each other, and is abutted and coupled to the lower flange portion 123, and has a trapezoidal cross section.
Further, the upper body portion 22 has the first bent portion in the extension direction.
4a, the second bent portion 4b, and the narrowed portion 4c.

The upper inner surface 2P formed by the inner surfaces of the upper inlet portion 21 and the upper body portion 22 is a smooth continuous curved surface,
It is above the air guide path 4.

As shown in FIG. 2, the upper surface of the upper member 2 is formed between the upper body portion 22 and the upper inlet portion 21 at a right angle to the extending direction.
The step has an uneven portion 25a and, as shown in FIGS. 5 and 6, four protrusions 25b on the upper surface of the body portion 22 along the extension direction.

The lower member 1 and the upper member 2 are welded together to form an intake air connector. A fuel injection device (not shown) that connects an air filter (not shown) and a rubber hose (not shown) to the air inlet 3 at one end, and connects an air outlet 5 at the other end to an intake manifold (not shown). ) And bolts.

In the intake air connector of the present embodiment, the lower inner surface 1P and the upper inner surface 2P forming the air guide path 4 are smooth and continuous curved surfaces, and since there are no corners and wedge-shaped grooves, turbulence does not easily occur in the passing air. . Therefore, the flow of the air guided from the air inlet 3 can be stably sent to the air outlet 5 without being disturbed. Therefore, the air guide path 4
The air resistance of the air passing through can be reduced.

Further, since the first bent portion 4a and the second bent portion 4b are provided, it is difficult for the passing air to have a local difference in flow velocity. For this reason,
The flow of the air guided from the air inlet 3 can be stably sent to the air outlet 5 without being disturbed.

Furthermore, since the internal shape of the air introduction port 3 is elliptical and the external shape of the cross section is circular, the welding width of the upper member 1 and the lower member 2 can be widened, and the joining force can be improved. Further, due to the difference in height between the upper side portion 222 and the lower side portion 122 of each member 1, 2, it is possible to prevent internal swelling, and the flange portions 123, 223
This can prevent reverse twist.

[Advantages of the Invention] The intake air connector of the present invention can reduce air resistance of the passing air without disturbing the air from the air filter, and can stably send the air to the fuel injection device. Moreover, it can be molded and is easy to manufacture.

Further, in the intake air connector of the present invention, since the joining force between the upper member and the lower member can be improved, it is possible to reliably withstand severe use.

Furthermore, with the intake air connector of the present invention, stable combustion can be realized because it is difficult to stop water and dust in the air before it is mixed with gasoline to flow into the fuel injection device and further into the engine and the like. it can.

[Brief description of drawings]

FIG. 1 shows a plan view of the lower member of the embodiment. FIG. 2 is a partial sectional front view of the intake air connector of the embodiment, FIG.
The figure shows a partial sectional side view thereof. 4, 5 and 6
The figures respectively show end views of AA, BB, CC of FIG. 7 and 8 are a plan view and a vertical sectional view, respectively, of a conventional intake air connector. DESCRIPTION OF SYMBOLS 1 ... Lower member, 2 ... Upper member 3 ... Air inlet, 4 ... Air guide path 5 ... Air outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Minakata Toshiki 1st Toyota-cho, Toyota City, Aichi Prefecture Toyota Motor Corporation (56) References 35451 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A lower inlet portion which forms a lower portion of an air inlet at one end, a lower body portion having a gutter shape integrally formed with the lower inlet portion, and an integral body on the other end side of the lower body portion. A short tubular outlet having an air outlet opening in a direction that intersects with the direction in which the lower body extends and is formed on the inner surfaces of the lower inlet, the lower body and the outlet. A molded lower member whose inner surface is a smooth continuous curved surface, an upper inlet portion that forms an upper portion of the air inlet at one end, and a lower body integrally formed with the upper inlet portion. Part and an upper body having an upside down shape that covers the outlet, and the upper inner surface formed by the inner surfaces of the upper inlet and the upper body is a smooth continuous curved surface. An upper member, and the lower member and the upper member in a combined state The inner surface and the upper inner surface are continuous with each other, the air inlet for introducing air from the air filter at one end, the air outlet for sending air to the fuel injection device communicating with the intake manifold at the other end, and the lower inlet. The portion has a lower insertion end having a semicircular cross section and a U-shaped inner cross section at the tip, and arcs linearly extend upward from both ends in the width direction from the lower insertion end toward the inner side. A cylindrical bottom portion having a linear bottom portion in the width direction of the lower body portion, and the upper inlet portion has an upper insertion end portion which is substantially plane-symmetrical to the lower insertion end portion at a tip. Intake air connector. 2. The lower body portion has a bottom portion which is linear in the width direction, lower lower portions which respectively rise from both ends of the bottom portion, and lower flange portions which are located at the upper ends of the respective lower side portions and project in directions away from each other. The upper body has a linear top in the width direction, upper upper portions extending downward from both ends of the top, and lower ends of the upper portions. The intake air connector according to claim 1, wherein the intake air connector has a trapezoidal cross section that includes an upper flange portion that protrudes in a direction away from each other and is abutted and joined to the lower flange portion.