JP4015417B2 - Intake duct pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake duct pipe, and more particularly to an intake duct pipe for sucking outside air and guiding it to an air cleaner in an internal combustion engine in an automobile or the like.
[0002]
[Prior art]
An intake duct pipe of an internal combustion engine such as an automobile is a pipe that constitutes an intake system of the internal combustion engine. When air passes through the pipe, a friction noise is generated, and a portion of the sound that resonates with the pipe is amplified. Makes noise. For this reason, the intake duct pipe is required to reduce noise associated with intake air.
[0003]
Conventionally, as an intake duct pipe of an internal combustion engine such as an automobile, one having a structure in which a hard material is provided on the outer surface of a cylindrical fiber layer as disclosed in JP-A-60-53658, or JP-A-5-126002. Known are those made of a cylinder of a porous material as shown in Japanese Laid-Open Patent Publication No. H., and those made of a cylindrical woven fabric as shown in Japanese Patent Laid-Open Nos. 4-321896 and 2000-64918.
[0004]
[Problems to be solved by the invention]
However, each of these intake duct pipes has an effect of reducing intake noise, but none of them is sufficient. In particular, in the case of a material made of a hard material, noise generated in the interior is easily reflected and amplified by the wall surface, and it is intensively emitted from the opening.
[0005]
In addition, the intake duct pipe is mainly connected between the air cleaner and the inlet member, but it is installed along a complicated route in a narrow engine room such as an automobile, and has a high degree of flexibility. It is preferable that it is difficult to buckle when bent.
[0006]
The duct tube made of the tubular woven fabric is flexible in itself and has an effect of reducing noise because the fiber absorbs sound energy. However, the duct tube is made only of the tubular woven fabric having no shape retention. It is difficult to maintain a cylindrical shape, and when this is maintained in a cylindrical shape with a reinforcing material, it becomes difficult to bend with a small radius of curvature due to poor flexibility, and depending on the fiber Sound absorption effect is impaired.
[0007]
The present invention has been made in view of such circumstances, is highly flexible and does not buckle due to bending, and does not absorb intake noise generated inside itself and release it outside. The object is to provide a very quiet intake duct tube.
[0008]
[Means for Solving the Problems]
Thus, the present invention comprises a tubular woven fabric in which a plurality of warp yarns arranged in an annular shape and extending in the length direction and a weft yarn extending in the circumferential direction intersecting with the warp yarns are woven in a tubular shape. The first weft yarn made of a rigid linear body and the second weft yarn made of a flexible natural or synthetic fiber having elasticity are alternately arranged one by one, and these weft yarns The warp yarn is woven with a plain weave structure.
[0009]
In the present invention, it is preferable to use a crimped yarn of synthetic fiber as the second weft.
In the present invention, among the warp yarns, the first warp yarn that passes through the outer side of the first weft yarn and the inner side of the second weft yarn passes through the inner side of the first weft yarn and the outer side of the second weft yarn. It can be woven longer than the second warp. Conversely, the first warp may be woven shorter than the second warp.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an intake duct pipe 1 according to the present invention. The intake duct pipe 1 has a plurality of warp yarns 2 arranged in an annular shape and extending in the length direction, and extending in the circumferential direction across the warp yarns. It consists of a tubular woven fabric 4 in which wefts 3 are woven into a tubular shape.
[0013]
Thus, in the present invention, as shown in FIG. 2, as the weft thread 3, a first weft thread 3a made of a rigid linear body and a second weft thread 3b made of a flexible natural or synthetic fiber thread are used. Are alternately arranged.
[0014]
As the rigid linear body constituting the first weft yarn 3a, a plastic bristle such as nylon or polyester, a metal wire such as a piano wire, or the like can be used.
[0015]
As the second weft yarn 3b, a yarn of natural fiber such as cotton yarn or hemp yarn, or a spun yarn or multifilament yarn of synthetic fiber such as nylon, polyester, polyolefin or polyvinyl alcohol can be used.
[0016]
As the second weft yarn 3b, a normal spun yarn or a multifilament yarn can be used, but it is preferable to use a yarn having elasticity, and particularly a crimped yarn of synthetic fiber is used. It is preferable to do this.
[0017]
When weaving the warp yarns 2 and the weft yarns 3 to form the tubular woven fabric 4, the first weft yarns 3a and the second weft yarns 3b are alternately arranged one by one. The warp yarn 2 is preferably woven with a plain weave structure.
[0018]
[Action]
In the present invention, since the first weft thread 3a made of a rigid linear body is used as the weft thread 3, the cross-sectional shape is held in a circular shape by the first weft thread 3a, and the cylindrical shape is maintained. .
[0019]
Since the second weft yarn 3b made of a flexible yarn is disposed between the first weft yarns 3a, flexibility occurs in the interval between the first weft yarns 3a, and a high degree of flexibility is maintained while maintaining a circular cross section. It has bendability, can be easily bent with a small radius of curvature, and does not buckle due to bending.
[0020]
Furthermore, since the structure of the present invention consists only of the tubular woven fabric 4 and the warp yarn 2 and the second weft yarn 3b are mainly exposed on the inner surface, the fibers constituting these yarns irregularly reflect sound. And absorb sound energy.
[0021]
Further, in the present invention, since the second weft thread 3b is made of a stretchable thread, the second weft thread 3b contracts at a position between the first weft threads 3a as shown in FIG. Reduces the size and causes severe unevenness.
[0022]
At this time, the first warp yarn 2a passing through the outer side of the first weft yarn 3a and the inner side of the second weft yarn 3b among the warp yarns 2 has a force to maintain the diameter by the rigidity of the first weft yarn 3a, The second weft 3b is bent flexibly by the force to be contracted, and the tubular woven fabric 4 is contracted in the length direction accordingly.
[0023]
On the other hand, the second warp yarn 2b passing through the inside of the first weft yarn 3a and the outside of the second weft yarn 3b is slackened due to the contraction in the length direction of the tubular woven fabric 4, but the force to remove this slackness is generated. There is no effect.
[0024]
At this time, the bristle and the metal wire constituting the first weft thread 3a have a smooth surface and are slippery. On the other hand, the crimped thread constituting the second weft thread 3b is entangled with a large number of fibers. Resistance is great.
[0025]
Therefore, the second warp yarn 2b slackened as described above is pulled inward as the second weft yarn 3b comes into contact with the second weft yarn 3b, and a portion between the positions in contact with the second weft yarn 3b. As shown in FIG. 3, it protrudes further inward by bending away from the first weft thread 3a.
[0026]
Accordingly, on the inner surface of the cylindrical woven fabric 4, the second warp yarn 2b protrudes inwardly along the position of the first weft thread 3a to form a large number of loops 5, and the cylindrical woven fabric 4 As a result of the formation of intense irregularities on the inner surface of the woven fabric, the sound is diffusely reflected within the tubular woven fabric 4 and the loop 5 protrudes in a loose and fluffy state without being constrained, so that the sound energy is effectively absorbed. .
[0027]
【The invention's effect】
Therefore, according to the present invention, the cross-sectional shape is maintained in a circular shape, and is extremely flexible and flexible, and can be bent freely with a small radius of curvature while maintaining the circular cross-section. There is no buckling.
[0028]
Further, the intake duct pipe 1 of the present invention is composed of only the tubular woven fabric 4, and the fibers exposed on the inner surface of the intake duct diffusely reflect the sound to absorb the energy, so that no noise is generated due to the intake air and is extremely quiet. is there.
[0029]
Furthermore, in the present invention, a large number of loops 5 project from the inner surface of the tubular woven fabric 4 and the loops 5 project in a slack state, so that the sound energy in the tubular woven fabric 4 is absorbed. The efficiency is high, and the generation of noise due to intake air can be further reduced.
[0030]
【Example】
FIG. 4 shows another embodiment of the present invention. Among the warp yarns 2 constituting the tubular woven fabric 4, the second warp yarn 2b is woven longer than the first warp yarn 2a. A large loop 5 protrudes from the inner surface of the tubular woven fabric 4. As a result, the energy absorption efficiency of the sound becomes higher and the quietness is further improved.
[0031]
FIG. 5 shows still another embodiment of the present invention, in which the second warp yarn 2b is woven shorter than the first warp yarn 2a. By doing in this way, although the inner surface of the cylindrical woven fabric 4 becomes comparatively smooth and a quietness level falls slightly, ventilation resistance falls.
[0032]
As means for changing the weaving length of the first warp yarn 2a and the second warp yarn 2b, the tension between the first warp yarn 2a and the second warp yarn 2b is made different when the tubular woven fabric 4 is woven. Can be. By making the tension of the second warp yarn 2b smaller than that of the first warp yarn 2a, the second warp yarn 2b can be woven longer than the first warp yarn 2a as shown in FIG. 4, and the tension of the second warp yarn 2b Is made larger than the first warp yarn 2a, the second warp yarn 2b can be woven short as shown in FIG.
[Brief description of the drawings]
FIG. 1 is a perspective view of an intake duct pipe of the present invention. FIG. 2 is an enlarged longitudinal sectional view of a part of the intake duct pipe of the present invention in a state in which a tubular woven fabric is stretched. 4 is an enlarged longitudinal sectional view of a part of the used state of the cloth. FIG. 4 is an enlarged longitudinal sectional view of a part of the tubular woven fabric in another embodiment of the invention. FIG. 5 is a tubular woven fabric in still another embodiment. [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake duct pipe 2 Warp thread 2a First warp thread 2b Second warp thread 3 Weft thread 3a First weft thread 3b Second weft thread 4 Tubular woven fabric

Claims (4)

From a tubular woven fabric (4) in which a plurality of warp yarns (2) arranged in a ring shape and extending in the lengthwise direction and a weft yarn (3) extending in the circumferential direction intersecting with the warp yarns (2) are woven in a tubular shape. The first weft thread (3a) is composed of a rigid linear body, and the second weft thread (3b) is composed of a flexible natural or synthetic fiber thread having elasticity . Ri Na by arranging alternately one by one, characterized by comprising weaving these wefts (3) and the warp (2) and a plain weave, the air intake duct pipe The intake duct pipe according to claim 1 , wherein the elastic yarn is a crimped yarn of synthetic fiber.   Among the warp yarns (2), the second warp yarn (2b) passing through the inside of the first weft yarn (3a) and the outside of the second weft yarn (3b) is the outer side of the first weft yarn (3a) and the second weft yarn (3a). The intake duct pipe according to claim 1 or 2, characterized in that it is woven longer than the first warp (2a) passing through the inside of the second weft (3b).   The intake duct pipe according to claim 1 or 2, wherein the second warp (2b) of the warp (2) is woven shorter than the first warp (2a).

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