阅读说明：本技术 用于内燃机的进气管 (Intake pipe for internal combustion engine ) 是由 木村龙介 大野知世 于 2019-06-19 设计创作，主要内容包括：一种用于内燃机的进气管,其包括构成进气通道的管状壁。壁包括在壁的周向上彼此独立的段。至少一个段由压缩成型的纤维体制成。各段包括从壁径向向外突出并具有接合部的凸缘。各段的凸缘的接合部和对应的一个段的凸缘的接合部彼此接合。各凸缘包括与对应的一个凸缘相对的相对表面。相对表面设置有台阶部,台阶部位于比接合部靠凸缘的近侧并且在凸缘的厚度方向上形成台阶。(An intake pipe for an internal combustion engine includes a tubular wall constituting an intake passage. The wall comprises segments which are independent of each other in the circumferential direction of the wall. At least one segment is made of a compressed shaped fibrous body. Each segment includes a flange projecting radially outwardly from the wall and having an engagement portion. The engaging portion of the flange of each segment and the engaging portion of the flange of a corresponding one of the segments are engaged with each other. Each flange includes an opposing surface opposite a corresponding one of the flanges. The opposing surface is provided with a step portion that is located closer to the flange than the engaging portion and that forms a step in the thickness direction of the flange.)

1. An intake pipe for an internal combustion engine, comprising a tubular wall constituting an intake passage, characterized in that,

the wall comprises segments that are independent of each other in the circumferential direction of the wall,

at least one of the segments is a compression-formed fibrous body,

each of the segments includes a flange projecting radially outward from the wall and having an engagement portion, the engagement portion of the flange of each of the segments and the engagement portion of the flange of a corresponding one of the segments are engaged with each other, and

each of the flanges includes an opposing surface opposing a corresponding one of the flanges, the opposing surface being provided with a step portion that is located on a near side of the flange than the engaging portion and that forms a step in a thickness direction of the flange.

2. The intake duct of claim 1, wherein a recess is provided between the engaging portion of at least one of the flanges that oppose each other and the step portion on the opposing surface.

3. The intake pipe according to claim 1 or 2,

the step portion is an inner step portion, and

the opposing surface of each of the flanges is provided with an outer step portion that is located farther from the flange than the engaging portion and that forms a step in a thickness direction of the flange.

4. The air intake duct of claim 3, wherein a recess is provided between the engaging portion of at least one of the flanges that oppose each other and the outer step portion on the opposing surface.

Technical Field

The following description relates to an intake pipe for an internal combustion engine.

Background

An intake passage of a vehicle-mounted internal combustion engine is provided with an intake pipe (see, for example, japanese patent laid-open No. 2007-321600). In this document, the wall of the air inlet tube is formed by two tubular halves formed from fibres. Each half body is provided at circumferentially opposite ends with two flanges projecting radially outward. The flanges that contact each other in the two halves are joined to each other by bonding or welding.

When the air inlet duct in the above-mentioned document is formed by bonding or welding, the adhesive or molten plastic may leak from the flange to the inside of the wall. This creates burrs on the inner surface of the wall, increasing airflow resistance.

Disclosure of Invention

An object of the following disclosure is to provide an intake pipe for an internal combustion engine, which restricts an increase in airflow resistance.

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

An intake pipe for an internal combustion engine according to the following description includes a tubular wall constituting an intake passage. The wall comprises segments which are independent of each other in the circumferential direction of the wall. At least one of the segments is a compression-formed fibrous body. Each segment includes a flange projecting radially outward from the wall and having a joint, the joint of the flange of each segment and the joint of the flange of a corresponding one of the segments being joined to each other. Each flange includes an opposing surface opposing a corresponding one of the flanges, the opposing surface being provided with a step portion located closer to the flange than the engaging portion and forming a step in a thickness direction of the flange.

Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

Drawings

Fig. 1 is a perspective view showing an intake pipe for an internal combustion engine according to the present embodiment.

Fig. 2 is a sectional view taken along line 2-2 in fig. 1.

Fig. 3 is a cross-sectional view of the flange shown in fig. 1.

Fig. 4 is a sectional view of an intake pipe according to a first modification corresponding to fig. 3.

Fig. 5 is a sectional view of an intake pipe according to a second modification corresponding to fig. 3.

Fig. 6 is a sectional view of an intake pipe according to a third modification corresponding to fig. 3.

Fig. 7 is a sectional view of an intake pipe according to a fourth modification corresponding to fig. 3.

Like reference numerals refer to like elements throughout the drawings and the detailed description. The figures may not be drawn to scale and the relative sizes, proportions and depictions of the elements in the figures may be exaggerated for clarity, illustration and convenience.

Detailed Description

This description provides a thorough understanding of the described methods, apparatus, and/or systems. Variations and equivalents of the described methods, apparatus, and/or systems will be apparent to those skilled in the art. The sequence of operations, except those necessarily performed in a particular order, is exemplary and may be varied as would be apparent to one of ordinary skill in the art. A description of functions and configurations well known to those skilled in the art may be omitted.

The exemplary embodiments may have different forms and are not limited to the illustrated examples. The illustrated examples, however, are both detailed and complete, and will convey the full scope of the disclosure to those skilled in the art.

An intake pipe for an internal combustion engine (hereinafter referred to as intake pipe 10) according to an embodiment will now be described with reference to fig. 1 and 2. In the following description, the upstream side and the downstream side in the flow direction of the intake air in the intake pipe 10 are simply referred to as the upstream side and the downstream side, respectively.

As shown in fig. 1, the air inlet tube 10 comprises a tubular wall 11. The upstream end of the wall 11 is provided with an inlet 12 into which inlet 12 the inlet air is drawn. The downstream end of the wall 11 is provided with a connection port 14, the connection port 14 being connected to, for example, an air cleaner.

The wall 11 is divided into two parts in the circumferential direction. The two parts are two sections (the first section 20 and the second section 40) in the form of half-pipes.

Referring to fig. 2, the first section 20 is a hard plastic shaped body and comprises a first wall 21 and two first flanges 22. The first wall 21 has the form of a half-pipe. The first flanges 22 respectively project radially outward from outer surfaces of circumferentially opposite ends of the first wall 21. The first flange 22 is disposed entirely along the axial direction of the first wall 21 (see fig. 1).

The second section 40 is a compression-formed fibrous body and comprises a second wall 41 and two second flanges 42. The second wall 41 has the form of a half-pipe. The second flanges 42 project radially outward from circumferentially opposite ends of the second wall 41, respectively. The second flange 42 is disposed entirely along the axial direction of the second wall 41 (see fig. 1).

The first wall 21 and the second wall 41 constitute the wall 11.

In the following description, the axial, circumferential and radial directions of the wall 11 are simply referred to as axial, circumferential and radial directions, respectively. The direction in which the flanges 22 and 42 protrude from the walls 21 and 41 (lateral direction in fig. 2 and 3) is referred to as the width direction. The proximal and distal sides of each of the flanges 22 and 42 in the projecting direction are simply referred to as the proximal and distal sides, respectively.

The structure of each first flange 22 and each second flange 42 will now be described in detail.

First flange 22

As shown in fig. 3, the first flange 22 projects radially outward from the outer surface of the first wall 21. The distal end of the first flange 22 is provided with an outer wall 23 projecting toward the second flange 42. The intermediate portion of the first flange 22 in the width direction is provided with a projection 24 that projects toward the second flange 42. The outer wall 23 and the projection 24 are arranged integrally in the axial direction. The first wall 21 has an end 21a diametrically opposite the outer wall 23.

The first flange 22 has an opposing surface opposite the second flange 42. The opposite surface of the first flange 22 is provided with an inner recess 28 and an outer recess 29. The inner recess 28 is located closer than the protrusion 24. The outer recess 29 is located more distally than the protrusion 24.

The inner recess 28 and the outer recess 29 are arranged entirely in the axial direction.

On the opposite surface of the first flange 22, an inner step portion 26 is formed by the inner concave portion 28 and the end portion 21a of the first wall 21. The inner step portion 26 forms a step in the thickness direction of the first flange 22.

On the opposite surface of the first flange 22, an outer step 27 is formed by an outer recess 29 and an outer wall 23. The outer step portion 27 forms a step in the thickness direction of the first flange 22.

The inner step portion 26 and the outer step portion 27 are arranged entirely in the axial direction.

Second flange 42

As shown in fig. 3, the second flange 42 projects radially outward from the end of the second wall 41.

The second flange 42 is provided at an intermediate portion in the width direction with a projection 44 projecting toward the first flange 22. The projection 44 is disposed entirely in the axial direction. The second flange 42 has a shape formed by bending a nonwoven fabric sheet, which will be described later.

The projection 44 is provided with an engaging portion 45 at an intermediate portion in the width direction, and the engaging portion 45 is engaged to the engaging portion 25 of the first flange 22. The engaging portions 25 and 45 are arranged entirely in the axial direction.

The second flange 42 has an opposite surface to the first flange 22. The opposing surfaces of the second flange 42 are provided with an inner step 46 and an outer step 47. The inner step portion 46 and the outer step portion 47 each form a step in the thickness direction of the second flange 42. The inner step portion 46 is constituted by the projection 44 and a portion of the second flange 42 located closer to the side than the projection 44. The outer step 47 is constituted by the projection 44 and a portion of the second flange 42 located more distally than the projection 44.

The inner step portion 46 and the outer step portion 47 are arranged entirely in the axial direction.

The projection 44 includes an inner wall 44 a. A gap is provided between the inner wall 44a and the end face of the end portion 21a of the first wall 21. Further, the projection 44 includes an outer wall 44 b. A gap is provided between the outer wall 44b and the inner surface of the outer wall 23 of the first wall 21.

The joint portion 25 of the first flange 22 and the joint portion 45 of the second flange 42 are joined to each other by vibration welding.

The fibrous shaped body constituting the second stage 40 will now be explained.

The fiber molding body is made of a nonwoven fabric of PET fiber and a nonwoven fabric of core-sheath composite fiber each including, for example, a core (not shown) made of polyethylene terephthalate (PET) and a sheath (not shown) made of modified PET (denated PET) having a melting point lower than that of the PET fiber. Modified PET used as a sheath for the composite fibers is used as a binder to bind the fibers to each other.

The blend percentage of modified PET may be 30% to 70%. For example, in the present embodiment, the blending percentage of the modified PET is 50%.

Such composite fibers may also include polypropylene (PP) having a melting point lower than that of PET.

The mass per unit area of the fiber-molded article may be 500g/m²To 1500g/m². For example, in the present embodiment, the mass per unit area of the fiber molded body is 800g/m²。

The second section 40 is formed by thermally compressing (hot pressing) the above-described nonwoven sheet having a thickness of, for example, 30mm to 100 mm. Further, in the present embodiment, the thickness of the second wall 41 and the second flange 42 is 1.0 mm.

The advantages of this embodiment will now be described.

(1) The intake pipe 10 includes a wall 11, and the wall 11 constitutes an intake passage and has a tubular shape. The wall 11 comprises a first section 20 and a second section 40 which are independent of each other in the circumferential direction of the wall 11. The second section 40 is a compression-molded fibrous body. The first segment 20 comprises first flanges 22, the first flanges 22 respectively projecting radially outwards from the wall 11 and comprising an engagement portion 25. The second section 40 comprises second flanges 42, the second flanges 42 respectively projecting radially outwards from the wall 11 and comprising engagement portions 45. The engaging portion 25 of the first flange 22 of the first segment 20 and the engaging portion 45 of the second flange 42 of the second segment 40 engage each other. Each first flange 22 has an opposing surface opposite a corresponding second flange 42. The opposing surface of the first flange 22 has an inner step portion 26, and the inner step portion 26 is located on the side closer than the joint portion 25 and forms a step in the thickness direction of the first flange 22. Each second flange 42 has an opposing surface opposite the corresponding first flange 22. The opposing surface of the second flange 42 has an inner step portion 46, and the inner step portion 46 is located on the side closer than the engaging portion 45 and forms a step in the thickness direction of the second flange 42.

In such a structure, the adhesive for joining the flanges 22 and 42 to each other or the molten plastic produced by welding the flanges 22 and 42 to each other is prevented from moving toward the positions on the near sides of the flanges 22 and 42 than the joint portions 25 and 45 by the inner step portions 26 and 46 as obstacles. This restricts leakage of the adhesive or the molten plastic toward the inside of the wall 11 through the gap between the flange 22 and the flange 42, and restricts generation of burrs on the inner surface of the wall 11. This limits the increase in airflow resistance.

Further, the second section 40 is a compression-molded fibrous body. This facilitates the disposition of the inner step portion 46 on the second flange 42.

(2) The inner concave portion 28 is disposed between the joining portion 25 of the flange 22 and the inner step portion 26 of the flange 22 and the flange 42 opposed to each other.

In such a structure, when the adhesive for joining the flange 22 and the flange 42 to each other or the molten plastic produced by welding the flange 22 and the flange 42 to each other is moved toward a position closer to the flange 22 than the joint portions 25 and 45, the adhesive or the molten plastic accumulates in the inner recessed portion 28. This prevents the adhesive or molten plastic from moving toward the position of the flanges 22 and 42 closer than the inner recess 28, and further restricts the adhesive or molten plastic from leaking to the inside of the wall 11 through the gap between the flanges 22 and 42.

(3) The opposing surfaces of the flanges 22 and 42 are provided with outer steps 27 and 47, respectively, the outer steps 27 and 47 being located farther from the flanges 22 and 42 than the engaging portions 25 and 45, and forming a step in the thickness direction of the flanges 22 and 42.

In such a structure, the adhesive for joining the flanges 22 and 42 to each other or the molten plastic produced by welding the flanges 22 and 42 to each other is prevented from moving toward the position on the far side of the flanges 22 and 42 from the joint portions 25 and 45 by the outer step portions 27 and 47 as obstacles. Thus limiting leakage of the adhesive or the molten plastic toward the outside of the flanges 22 and 42 through the gap between the flanges 22 and 42 and limiting generation of burrs on the outside of the flanges 22 and 42. This limits the case of degrading the aesthetic sense of the intake duct 10.

(4) The outer recess 29 is disposed between the engaging portion 25 of the flange 22 and the outer step portion 27 on the opposing surface of the flanges 22 and 42 opposing each other.

In such a structure, when the adhesive for joining the flanges 22 and 42 to each other or the molten plastic produced by welding the flanges 22 and 42 to each other is moved toward a position on the far side of the flanges 22 and 42 from the joint portions 25 and 45, the adhesive or the molten plastic accumulates in the outer recessed portion 29. This prevents the adhesive or the molten plastic from moving toward the position farther from the flanges 22 and 42 than the outer recessed portion 29, and further restricts the adhesive or the molten plastic from leaking to the outside of the flanges 22 and 42 through the gap between the flanges 22 and 42.

The above-described embodiment may be modified as follows. The present embodiment and the following modifications can be combined as long as the combined modifications are technically kept consistent with each other.

In the first modification shown in fig. 4, a first flange 122 projects outward from an end of the first wall 121 in the circumferential direction. Further, the first flange 122 is provided at the middle portion in the width direction with a protrusion 124 protruding toward the second flange 142. The second flange 142 is provided at an intermediate portion in the width direction with a receiving recess 144, the receiving recess 144 receiving the protrusion 124 of the first flange 122 and having a gap spaced apart from each other in the width direction. The end surface of the protrusion 124 and the bottom surface of the accommodation recess 144 are provided with an engagement portion 125 and an engagement portion 145, respectively, which engage with each other.

In this case, an opposite surface of the first flange 122 to the second flange 142 is provided with an inner step 126 and an outer step 127. The inner step portion 126 is located closer to the engaging portion 125. The outer step portion 127 is located more distally than the engaging portion 125. Further, an opposite surface of the second flange 142 to the first flange 122 is provided with an inner step portion 146 and an outer step portion 147. The inner step portion 146 is located closer than the engaging portion 145. The outer step portion 147 is located more distally than the engagement portion 145.

In the same manner as the second section, the first section may be a fibrous shaped body. In this case, for example, the following modifications shown in fig. 5 to 7 can be employed.

In a second modification shown in fig. 5, a first flange 222 protrudes outward from an end of the first wall 221 in the circumferential direction. The projection 224 projects from the intermediate portion of the first flange 222 in the width direction toward the second flange 242. The first flange 222 has a shape formed by bending a nonwoven fabric sheet.

The second flange 242 has the same shape as in the first modification. An end surface of the protrusion 224 of the first flange 222 and a bottom surface of the accommodation recess 244 of the second flange 242 are provided with an engagement portion 225 and an engagement portion 245, respectively, which are engaged with each other using an adhesive. Further, the protrusion 224 of the first flange 222 is in contact with the receiving recess 244 of the second flange 242 without any gap.

In this case, an opposite surface of the first flange 222 to the second flange 242 is provided with an inner step 226 and an outer step 227. The inner step portion 226 is located closer than the engagement portion 225. The outer step portion 227 is located more distally than the engaging portion 225. Further, an opposing surface of the second flange 242 opposite the first flange 222 is provided with an inner step 246 and an outer step 247. The inner step portion 246 is located closer than the engaging portion 245. The outer step portion 247 is located more distally than the engaging portion 245.

The third modification shown in fig. 6 is different from the second modification in the following respects. That is, the intermediate portion in the width direction of the accommodation recess 344 of the second flange 342 is provided with a protrusion 344a protruding toward the first flange 322. The end surface of the protrusion 324 of the first flange 322 and the end surface of the protrusion 344a are provided with an engaging portion 325 and an engaging portion 345, respectively, which engage with each other. In this case, the inner concave portion 348 is provided between the engaging portion 345 and the inner step portion 346. Further, an outer recess 349 is provided between the engagement portion 345 and the outer step portion 347. Such a structure has advantages (2) and (4) of the above-described embodiment.

The fourth modification shown in fig. 7 is different from the second modification in the following respects. That is, the protrusion 424 of the first flange 422 and the receiving recess 444 of the second flange 442 have a V-shaped cross section and contact each other. Further, the top of the protrusion 424 and the bottom of the accommodation recess 444 are provided with an engaging portion 425 and an engaging portion 445, respectively, which engage with each other.

The wall of the inlet pipe may be divided into three or more sections.

Various changes in form and detail may be made to the above examples without departing from the spirit and scope of the claims and their equivalents. These examples are for illustration only and are not intended to be limiting. The description of features in each example should be considered applicable to similar features or aspects in other examples. Suitable results may be achieved if the components are ordered differently, and/or if components in the illustrated system, architecture, device, or circuit are combined differently and/or replaced or supplemented by other components or their equivalents. The scope of the present disclosure is not to be limited by the specific embodiments but by the claims and their equivalents. All changes that come within the scope of the claims and their equivalents are intended to be embraced therein.