JPH058167U - Engine air intake pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent radial deformation of the air intake pipe made of rubber material due to negative pressure. [Structure] A reinforcing body 10 having a substantially circular shape having an open end and a photograph 11 formed at the open end, and made of a material having high rigidity such as metal, is pinched with a finger or the like, and its diameter is reduced. It is inserted in the air intake pipe 2 in a reduced size.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine air intake pipe that is interposed between an air cleaner and a throttle body and supplies air cleaned by the air cleaner to the engine.

[0002]

[Prior Art]

 Many of these air intake pipes have a bend due to the arrangement of the throttle body and the air cleaner that variably control the amount of intake air into the automobile engine, and because they absorb vibrations from the engine part, they have anti-vibration properties. Furthermore, flexibility is required in order to facilitate the assembling work and absorb some positional errors between the assembling parts. Therefore, it is often made of rubber material, but negative pressure may be generated inside due to the intake resistance of the air cleaner, which may cause deformation of the pipe, causing vibration and noise, or The engine output may be reduced.

Conventionally, in order to prevent such deformation, it has been considered that the wall thickness of the intake pipe is increased, the rubber hardness is increased, or the reinforcing rib is formed on the outer surface. If a large negative pressure is generated, or if the rubber material becomes soft due to heating due to conduction heat from the engine, it is impossible to prevent the deformation.

As another conventional example for preventing deformation, a structure in which a reinforcing pipe is attached to the inner surface of the intake pipe is also known (for example, Japanese Utility Model Publication No. 53-66515).

[0005]

[Problems to be solved by the device]

 In the structure disclosed in the above publication, the reinforcing pipe is attached to the inner surface of the air intake pipe by adhesion, baking or insert molding. In such a structure, the rubber material is integrally molded at the same time when it is molded, which complicates the mold and complicates the molding work. It is also possible to bond the reinforcing pipe after rubber molding, but there are places such as bends where it is difficult to apply the adhesive to the pipe, and even with this method the work will be troublesome.

The present invention has been made in view of such circumstances, and provides a structure in which a reinforcing body can be easily mounted in a molded air intake pipe.

[0007]

[Means for Solving the Problems]

 The present invention is an air intake pipe, which is connected between an air cleaner and a throttle body and supplies the air cleaned by the air cleaner to the engine through the throttle body, and which has a substantially circular cross section and is made of a rubber material. In addition, a substantially circular reinforcing member made of a highly rigid material such as metal or plastic is interposed inside the portion that is easily deformed by negative suction pressure, and the reinforcing member is bent into a substantially circular shape. The both ends are open ends, the both ends are separated by a predetermined distance, and a photograph is formed which is bent toward the center of the pipe.

[0008]

[Action]

 A reinforcing member made of metal or plastic is pinched at a predetermined position in the molded air intake pipe, that is, a position that is previously formed in a concave shape, and is inserted in a small-diameter state into the concave portion. It is installed. The reinforcing body adheres to the air intake pipe from the inside and prevents the air intake pipe from contracting due to negative pressure.

[0009]

【Example】

 FIG. 3 shows a state in which the air intake pipe is attached to the engine 1, and air purified by an air cleaner (not shown) is supplied from the direction of arrow a. Reference numeral 2 is an air intake pipe, and 3 is a throttle body to which the end of the air intake pipe 2 on the exhaust side is connected and fixed. The throttle body 3 constitutes a part of the engine 1 of the automobile and adjusts the amount of intake air to the engine.

As shown in FIG. 1, the air intake pipe 2 is vulcanized and molded with a rubber material such as nitrile rubber, and includes a bent portion 4, a bellows portion 5, and a straight portion 6. The bellows portion 5 has a function of imparting flexibility to the intake pipe 2 to absorb vibration, facilitating assembly work, and adjusting and absorbing a slight positional error between the air throttle body 3 and the air cleaner. Therefore, it is required to have flexibility, and therefore it is the part that is most likely to be deformed by negative pressure. Reference numeral 7 is a reinforcing rib formed on the outer surface of the bent portion 4. The air intake pipe is often formed to have a circular cross section or an oval cross section, and in this example, the substantially circular shape is interpreted to include a circular shape and an oval shape. 8 is a metal ring made of aluminum or the like forming a flange-shaped portion fitted to the exhaust side opening end, and 9 is a metal band for fastening the pipe 2 from the outer periphery of the opening end and fixing the pipe 2 and the metal ring 8. Is. The metal ring 8 is connected to the air throttle body 3. The other open end of the air intake pipe 2 is connected to the air cleaner via a metal band (not shown).

In FIGS. 1 and 2, reference numerals 10, 10 and 10 denote reinforcements made of a highly rigid material such as metal or plastic, which are bent to a diameter substantially equal to or slightly larger than the inner diameter of the pipe 2. Both ends of the pipe 2 are open ends, and the photographing portions 11, 11 are formed at predetermined intervals and are bent toward the center of the pipe 2. To give an example of the dimensions of the reinforcing body 10, the thickness d ₁ = 3.2 mm, the diameter d ₂ = 82 mm, the interval d ₃ = 15 mm between the images 11, 11 and the length d _{4 of the} images 11, 11. = 10 mm.

The reinforcing body 10 is arranged on the inner surfaces of the straight portion 6 and the bellows portion 5 which are easily deformed. Two adjacent convex portions 12 and 12 are formed inside the linear portion 6, and the reinforcing body 10 is installed in the groove between the convex portions 12 and 12. In the bellows portion 5, the reinforcing body 10 is arranged in the concave portion of the one wavy portion. When the deformation prevention is insufficient only with the reinforcing ribs 7, the reinforcing ribs 7 can be arranged also on the inner surface of the bent portion 4 provided with these. The reinforcements 10, 10, 10 should be attached with the images 11, 11 of the reinforcements 10, 10, 10 pinched with fingers or tweezers so that the images 11, 11 are brought close to or in contact with each other to reduce the diameter. It is inserted into the pipe 2 and positioned between the convex portions 12 and 12 or in the bellows portion 5 and brought into contact with the inner surface of the pipe 2 by utilizing the vane property of the reinforcing body 10 itself.

[0013]

[Effect of the device]

 According to the present invention, the negative pressure deformation can be prevented by arranging the reinforcement body mounted after the pipe is formed on the inner surface of the air intake pipe, and the noise generation and the engine output reduction due to the deformation can be prevented. be able to.

Further, according to the present invention, since the reinforcing body can be inserted from the opening end of the pipe by pinching it with a finger or the like, the mounting work is easy and the complicated metal as shown in the conventional example is used. No mold, molding or gluing work is required.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a perspective view showing an attached state of an air intake pipe.

[Explanation of symbols]

 1 Engine 2 Air intake pipe 3 Throttle body 4 Bent part 5 Bellows part 6 Straight part 7 Reinforcing rib 10 Reinforcement body 11 Photographing 12 Convex part

Claims (1)

[Claims for utility model registration] 1. A rubber material which is connected between an air cleaner and a throttle body and supplies air cleaned by the air cleaner to the engine through the throttle body. An air intake pipe having a substantially circular cross section, wherein a substantially circular reinforcing member formed of a highly rigid material such as metal or plastic is interposed inside a portion that is easily deformed by negative suction pressure. The engine is characterized in that the reinforcing body is bent into a substantially circular shape, both ends thereof are open ends, the both ends are separated by a predetermined distance, and a photograph is formed by bending the pipe toward the center of the pipe. Air intake pipe.