JP2014104599A - Air intake duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of a lower side part in an air intake duct in which an inside partition part is built in an upper side part.SOLUTION: Relating to an air intake duct 23 that builds an inside partition part 10 in which two or more channels that reach air intake ports 6a, 6b, 6c, 6d, 6e, 6f are block-formed in an upper side part of a duct main body 9 in which the air intake ports 6a, 6b, 6c, 6d, 6e, 6f that intake ambient air as an engine air intake are opened in an upper side; an inner skeleton 19 that extends to a bottom edge of the duct main body 9, and reinforces a lower side part of the duct main body 9 not to obstruct an air intake flow from the respective channels is integrally formed at a lower part of the inside partition part 10, and the inner skeleton 19 is encapsulated in a parison with the inside partition part 10, and is integrated by mold closing when blow molding the duct main body 9.

Description

  The present invention relates to an intake duct.

  In general, large transport vehicles such as trucks have more opportunities to travel on unpaved rough roads than ordinary passenger cars, so the engine intake air is not air near the ground, which contains a lot of dust. Therefore, it is preferable to take in a sufficiently high part of the clean air from the ground, and there is a risk of the rainwater and snow jumping together near the ground. It is preferable to incorporate.

  For this reason, in a large transport vehicle, as shown in an example in FIG. 8, the air intake duct 4 installed on the rear surface of the cab 3 is made flexible with respect to the air cleaner inlet duct 2 connected to stand upright with the air cleaner 1. It is connected via a boot 5 so that outside air can be taken in from an air intake 6 opened on the upper side of the intake duct 4.

  With regard to such an intake duct 4, the present inventors have examined the flow rate (flow rate) of the outside air sucked from the air intake 6, and no matter how much the air intake 6 is formed with a large opening area, the outside air is air. It has been found that the air is sucked from the lower side of the intake port 6 and is hardly sucked from the upper side of the air intake port 6. Thus, the outside air is sucked to the lower side of the air intake port 6. There is a concern that the flow rate increases due to the bias, and it becomes easy to suck rain, snow, and dust from the lower side of the air intake 6.

  Therefore, in order to make the flow velocity distribution of the outside air sucked from the air intake 6 uniform, it has been studied to divide the inside of the intake duct 4 into a plurality of flow paths to increase the number of chambers. As described above, in the conventional method of dividing the flow paths A and B by forming a partition wall 7 by sandwiching and crushing a part of the intake duct 4 with a mold (not shown) during blow molding, the intake duct 4 is divided. By crushing a part of the channel, the cross-sectional area of the flow path is reduced, leading to an increase in intake resistance.

  For this reason, as shown in FIGS. 10 to 12, a duct body 9 (see FIG. 10) having air intakes 6a, 6b, 6c, 6d, 6e, and 6f for taking outside air as engine intake air opened upward, A plurality of flow paths A, B, C, D, E, and F (see FIG. 11) included in the duct body 9 during blow molding and reaching the air intake ports 6a, 6b, 6c, 6d, 6e, and 6f. There has been proposed an intake duct 8 that is formed by combining an internal partition component 10 (see FIG. 12) that forms a partition in the upper portion of the duct body 9 (see Patent Document 1 below).

  That is, the internal partition component 10 includes a vertical partition wall 11 that divides the inside of the duct body 9 in the front-rear direction, and a side wall 12 that further divides the inside of the duct body 9 divided in the front-rear direction by the vertical partition wall 11 in the left-right direction. It is separately manufactured as an injection-molded product, and the six flow paths A, B, C, D, E, and F are contained in the duct body 9 by being included in the duct body 9 when the duct body 9 is blow-molded. A partition can be formed.

  In addition, each of the flow paths A, B, C, D, E, and F can be individually communicated with the air intake ports 6a, 6b, 6c, 6d, 6e, and 6f. Guide parts 13, 14, 15, 16, and 17 are formed, and in the example shown here, the rear flow paths A, B, and C divided by the vertical partition wall 11 are the upper air intakes. The front flow paths D, E, and F divided by the vertical partition 11 communicate with the lower air intakes 6d, 6e, and 6f, and communicate with the inlets 6a, 6b, and 6c.

  As shown in FIG. 13, the front surfaces of the air intake ports 6a, 6b, 6c, 6d, 6e, and 6f (see FIG. 10) are covered with a louver 18 so as to avoid the inhalation of rain and snow as much as possible. It is preferable to keep it.

JP 2011-132913 A

  However, in such a conventional structure, there is a problem that the rigidity of the lower part having a hollow structure is lower than that of the upper part in which the internal partition component 10 functions as a strength member. Therefore, there is a concern that vibration is likely to occur in the intake duct 4 due to intake pulsation or the like, and that the vibration is transmitted to the rear surface of the cab 3 and the like and causes generation of an indoor noise.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve the rigidity of the lower portion of the intake duct having an internal partition part built in the upper portion.

  The present invention is an air intake duct that incorporates an internal partition component that forms a plurality of flow paths leading to the air intake at an upper portion of a duct body that opens an air intake that takes in outside air as engine intake air. An internal skeleton that integrally extends to the lower end of the duct body and that reinforces the lower portion of the duct body so as not to hinder the flow of intake air from the flow paths. The internal skeleton is encapsulated in a parison together with the internal partition parts at the time of blow molding of the duct body, and is integrated by clamping.

  Thus, when the duct body is blow-molded, the internal skeleton is encapsulated in the parison together with the internal partitioning parts and integrated by clamping to form the internal skeleton in the lower part of the duct body. Since it can be reinforced by being built in, the rigidity of the lower portion of the intake duct is greatly improved as compared with the prior art.

  Furthermore, in carrying out the present invention more specifically, a pair of left and right partition plates that divide the internal space of the lower part of the duct body into three parts in the left and right direction, and a partition that is partitioned between the left and right partition plates It is possible to constitute an internal skeleton with an H-shaped cross section by a front and rear partition plate that divides the space into two in the front-rear direction, and in this way, the inside can be effectively reinforced without hindering the flow of intake air The skeleton can be realized with a relatively simple structure, and the increase in the weight of the intake duct due to the addition of the internal skeleton can be suppressed.

  Further, when an internal skeleton having an H-shaped cross section is constituted by the pair of left and right partition plates and the front and rear partition plates in this way, a reduction hole is opened in at least one of each of the left and right partition plates and the front and rear partition plates. It is preferable to reduce the weight of the inner skeleton by opening the reduction hole, and to further suppress the increase in the weight of the intake duct.

  Furthermore, when opening the reduction holes in each of the left and right partition plates and the front and rear partition plates, it is preferable to chamfer at least the edges of the reduction holes that face the flow of the airflow. Even if the edge flows, the intake air flows smoothly without causing separation, and the generation of wind noise is avoided in advance.

  According to the intake duct of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, the lower part of the intake duct in which the inner partition part is built in the upper part is provided with a built-in internal skeleton in the lower part to reinforce the lower part of the intake duct. Therefore, it is possible to prevent troubles such as indoor noise caused by the lower rigidity of the lower portion of the intake duct.

  (II) According to the invention described in claim 2 of the present invention, an internal skeleton that can be effectively reinforced without impeding the flow of intake air can be realized with a relatively simple structure. It is possible to suppress an increase in the weight of the air intake duct due to the additional installation.

  (III) According to the invention described in claim 3 of the present invention, it is possible to reduce the weight of the internal skeleton by opening the reduction holes in the left and right partition plates and the front and rear partition plates, thereby increasing the weight of the intake duct. Further suppression can be achieved.

  (IV) According to the invention described in claim 4 of the present invention, even if the intake air flows by squeezing the edge of each mitigation hole, the intake air can flow smoothly without causing separation. The generation of sound can be avoided in advance, and the possibility of causing an unpleasant wind noise to the passenger can be eliminated.

It is a front view which shows an example of the form which implements this invention. It is a front view which shows the internal partition components and internal frame of FIG. It is a perspective view in the state where the louver of the intake duct of Drawing 1 was attached. It is a perspective view which shows the internal partition components and internal skeleton of FIG. It is a perspective view which shows the example which opened the reduction | restoration hole also in each right-and-left partition plate of the internal skeleton of FIG. It is sectional drawing which shows the example which chamfered the edge part which opposes the flow of the airflow of a reduction | restoration hole. It is sectional drawing which shows the case where the edge part of a reduction | restoration hole is not chamfered as a comparative example. It is the schematic which shows an example of a general intake duct. It is sectional drawing explaining the method of crushing a part of intake duct and dividing | segmenting a flow path. It is a perspective view which shows the prior art example which multi-chambered the upper part in a duct main body. It is sectional drawing of the XI-XI arrow of FIG. It is a perspective view of the internal partition components incorporated in the duct main body of FIG. It is a perspective view which shows the state which coat | covered the front surface of the air intake port of FIG. 10 with the louver.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show an example of an embodiment for carrying out the present invention. The constituent elements that are not different from the constituent elements in the previous FIGS. The explanation is omitted.

  In the present embodiment, the intake duct 23 has air intakes 6a, 6b, 6c, 6d, 6e, 6f on the upper side for taking outside air as engine intake air, as in the conventional structure described with reference to FIGS. A plurality of flow paths A, B, C, D, E, and F (see FIG. 11) extending to the air intake ports 6a, 6b, 6c, 6d, 6e, and 6f are vertically arranged on the upper portion of the opened duct body 9. The internal partition component 10 that is partitioned by the partition wall 11 and the side wall 12 and the guide portions 14, 15, 16, and 17 is built in, but in the lower portion of the internal partition component 10 shown as an example here, The lower portion of the duct body 9 is reinforced so as to extend to the lower end of the duct body 9 and not obstruct the flow of intake air from the flow paths A, B, C, D, E, and F (see FIG. 11). The internal skeleton 19 is formed integrally Ri, and so as to integrate the the internal skeleton 19 wherein during blow molding by encapsulated inside partition part every 10 within the parison clamping the duct body 9.

  Here, the internal skeleton 19 formed integrally with the lower part of the internal partition part 10 extends downward continuously from the side wall 12 of the internal partition part 10 and is an internal space in the lower part of the duct body 9. An internal skeleton having an H-shaped cross section comprising a pair of left and right partition plates 20 that are divided into three in the left and right direction, and a front and rear partition plate 21 that divides a partition space defined between the left and right partition plates 20 in the front and rear direction. 19.

  Further, when the internal skeleton 19 having an H-shaped cross section is configured by the pair of left and right partition plates 20 and the front and rear partition plates 21 in this way, at least one of each of the left and right partition plates 20 and the front and rear partition plates 21 has a reduction hole 22. In the example shown here, an example is shown in which a plurality of reduction holes 22 are opened at intervals in the front-rear partition plate 21 in the vertical direction. For example, as shown in FIG. In addition, the reduction holes 22 may be opened in the left and right partition plates 20.

  As shown in FIG. 6, when the reduction holes 22 are opened in the left and right partition plates 20 and the front and rear partition plates 21, at least the edge 22 a that faces the air flow in the reduction holes 22 is chamfered. Preferably, in the example shown here, the chamfering process is performed by rounding off the sharp corner at the edge 22a of the reduction hole 22 so as to draw an arc, but the sharp edge at the edge 22a of the reduction hole 22 is sharpened. You may make it perform C chamfering which cut off the corner | angular side.

  Thus, if the intake duct 23 is configured in this way, the duct body 9 is encapsulated in the parison and integrated with the inner skeleton 19 together with the internal partitioning parts 10 when the duct body 9 is blow-molded. 9 can be reinforced by incorporating the internal skeleton 19 in the lower part of the air intake 9, and the rigidity of the lower part of the air intake duct 23 can be greatly improved as compared with the prior art. It is possible to prevent troubles such as indoor noise caused by the fact that the rigidity of the portion is low.

  In particular, in this embodiment, a pair of left and right partition plates 20 that divide the internal space of the lower portion of the duct body 9 in the left and right direction, and a partition space partitioned between the left and right partition plates 20 in the front and rear direction Since the inner skeleton 19 having an H-shaped cross section is constituted by the front and rear partition plates 21 divided into two, the inner skeleton 19 that can be effectively reinforced without obstructing the flow of intake air has a relatively simple structure. The increase in the weight of the intake duct 23 due to the addition of the internal skeleton 19 can be suppressed.

  Further, when the reduction holes 22 are opened in the left and right partition plates 20 and the front and rear partition plates 21, at least the edge portions 22a facing the air flow in the reduction holes 22 are chamfered. Even if the intake air flows by grazing the edge 22a of the mitigation hole 22, the intake air can be smoothly flown to avoid the generation of wind noise, thereby eliminating the possibility that the passenger feels an unpleasant wind noise. be able to.

  That is, as shown in FIG. 7, if the edge 22a of the reduction hole 22 is not chamfered, when the intake air flows by grabbing the edge 22a of each reduction hole 22, the edge of the edge 22a is sharpened. However, if the sharp corners of the edge portion 22a are chamfered in advance, the intake air flows smoothly and the generation of wind noise is avoided. Will be.

  Note that the intake duct of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

6a, 6b, 6c, 6d, 6e, 6f Air intake 9 Duct body 10 Internal partition component 19 Internal frame 20 Left and right partition plate 21 Front and rear partition plate 22 Reduction hole 22a Edge 23 Intake duct A, B, C, D, E , F flow path

Claims (4)

  An air intake duct having an internal partition part that partitions and forms a plurality of flow paths leading to the air intake, in an upper portion of a duct body that opens an air intake that takes in outside air as engine intake air upward, An internal skeleton that extends to the lower end of the duct body and that reinforces the lower portion of the duct body so as not to hinder the flow of intake air from the respective flow paths is integrally formed at the lower part of the internal partition part, An air intake duct characterized in that, when blow-molding the duct body, the internal partition parts are encapsulated in a parison and integrated by clamping.   A pair of left and right partition plates that divide the internal space of the lower part of the duct body in the left and right direction, and a front and rear partition plate that divides the partition space partitioned between the left and right partition plates in the front and rear direction into two. The intake duct according to claim 1, wherein an internal skeleton having a cross-section is formed.   The intake duct according to claim 2, wherein a reduction hole is opened in at least one of each of the left and right partition plates and the front and rear partition plates.   The intake duct according to claim 3, wherein at least an edge of the reduction hole facing the airflow is chamfered.

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