JP2014173694A - Corrugated tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated tube that when a corrugated tube is curved and fitted, can restrict the curve direction and angle of the corrugated tube, and can be easily manufactured at low cost.SOLUTION: In a synthetic resin corrugated tube 10, both ends thereof have a cylindrical fitting part 12, and a bellows part 13 is formed between the fitting parts 12. A plurality of consecutive ribs 16 connecting crest parts 14 of the bellows part 13 and a plurality of opposite ribs 17 at the same positions on the opposite sides in a radial direction of the ribs are formed in a plurality of predetermined parts of the bellows part 13.

Description

  The present invention relates to a corrugated tube having a bellows portion.

  When a synthetic resin corrugated tube is attached to an attachment body, for example, a car body of an automobile, the synthetic resin corrugated tube may be bent and attached three-dimensionally for handling with other members. In that case, as shown in FIG. 6, the attachment portions 112 and 112 on both sides of the corrugated tube 110 have different attachment directions, and a bellows portion 113 is provided so that the corrugated tube 110 can be freely bent and attached. ing.

  When the corrugated tube 110 having the bellows portion 113 is attached to the mounting body as it is, the bellows portion 113 is bent freely as shown in FIG. 7. Depending on the bending direction of the bellows portion 113, The bellows portion 113 of the corrugated tube 110 will come into contact. If it does so, abnormal noise will generate | occur | produce or the corrugated tube 110 will be worn out.

  Therefore, as shown in FIG. 8, the corrugated tube 210 is provided with attachment portions 212, 212 at both ends, and a plurality of bellows portions 213, 213, 213 and the bellows portions 213, 213, 213 between the attachment portions 212, 212 The corrugated tube 210 having a plurality of straight portions 214, 214 without the bellows is formed, and after the corrugated tube 10 is formed, the bellows portions 213, 213, 213 are bent so as to bend in a predetermined direction. There is something that fixes the direction.

In this case, as shown in FIG. 9, the bending angle and direction of the corrugated tube 210 are preliminarily molded and determined. Therefore, even if the corrugated tube 210 is attached to the attachment body, the buffer member 1 and the corrugated tube 210 which are other members are used. The accordion portion 213 does not come into contact.
However, in this case, since a step of bending the bellows portions 213, 213, and 213 so as to bend in a predetermined direction is added, it takes time and productivity is not good.

  Further, as shown in FIGS. 10 and 11, there is one in which one convex portion 316 is provided continuously in the longitudinal direction in the concave groove 315 so as to connect the convex strip 314 and the convex strip 314 of the corrugated tube 310 (for example, , See Patent Document 1). In this case, the convex portion 316 is only one extending in the longitudinal direction on the entire circumference of the corrugated tube 310, preventing the displacement of the mounting components on the outer periphery of the tube due to the expansion and contraction in the longitudinal direction of the corrugated tube 310. The flexibility of 310 is ensured. Therefore, when the corrugated tube 310 is bent, its bending direction and angle cannot be regulated.

JP 2006-223087 A

  Therefore, the present invention is intended to provide a corrugated tube that is easy to produce and low in cost, in which when the corrugated tube is bent and attached, its bending direction and angle can be regulated.

In order to solve the above problem, the present invention of claim 1 is a corrugated tube made of synthetic resin.
Both ends have a cylindrical mounting portion, a bellows portion is formed between the mounting portions, and a plurality of continuous ribs connecting the peak portion of the bellows portion to a predetermined plurality of portions of the bellows portion, and the rib has a radius A corrugated tube having a bellows part, wherein a plurality of opposed ribs are formed at the same position on the opposite side in the direction.

  In the first aspect of the present invention, since both ends have cylindrical attachment portions and the bellows portions are formed between the attachment portions, the bellows portions are bent even if the attachment directions of the attachment portions at both ends are different. The corrugated tube can be bent and attached.

A plurality of continuous ribs connecting the peak portions of the bellows portion and a plurality of opposed ribs at the same position on the opposite side in the radial direction are formed in a predetermined plurality of portions of the bellows portion. Therefore, it is possible to prevent bending in the direction on the plane where the rib and the opposing rib are provided, and to bend in a direction perpendicular to the direction where the rib and the opposing rib are provided. Therefore, the bending direction of the corrugated tube can be regulated without previously forming the bending angle of the corrugated tube by bending.
In addition, since a plurality of continuous ribs and a plurality of opposing ribs are provided, the bending radius of the corrugated tube can be controlled by changing the number of ribs.

  According to the second aspect of the present invention, the ribs and the opposing ribs formed in the other predetermined portions of the bellows part are arranged on the central axis of the corrugated tube. It is a corrugated tube formed in the peak part of the bellows part of a different angle.

  In the present invention of claim 2, the ribs and the opposed ribs formed in the other predetermined portions of the bellows part are formed on the central axis of the corrugated tube, with respect to the ribs and the opposed ribs formed in the predetermined part of the bellows part. On the other hand, it was formed in the peak portion of the bellows portion at different angles. For this reason, the bending direction of a corrugated tube can be changed for every part of a tube, and a corrugated tube can be bent and attached in three dimensions.

  According to a third aspect of the present invention, the corrugated tube is a corrugated tube formed of polyethylene or high density polyethylene (HDPE).

  In the present invention of claim 3, since the corrugated tube is formed of polyethylene or high-density polyethylene (HDPE), it is excellent in flexibility, durability and weather resistance, and is excellent in fuel oil resistance and chemical resistance. .

  According to a fourth aspect of the present invention, the corrugated tube is a corrugated tube formed of a synthetic resin layer having a multilayer structure.

  In the present invention of claim 4, since the corrugated tube is formed of a synthetic resin layer having a multilayer structure, by combining various synthetic resins, excellent various controls, for example, excellent flexibility and durability, A corrugated tube with low permeability such as fuel gas can be obtained.

  The present invention of claim 5 is the corrugated tube in which the bellows part has a straight part in the middle, and an attachment clamp is attached to the straight part.

  In this invention of Claim 5, since the bellows part has the straight part in the middle and the attachment clamp was attached to the straight part, while being able to control the bending direction and angle of a corrugated tube more reliably, the vibration of a corrugated tube is controlled. Can be prevented.

  Since a plurality of continuous ribs connecting the peak portions of the bellows portion and a plurality of opposed ribs at the same position on the opposite side in the radial direction are formed in a predetermined plurality of portions of the bellows portion of the corrugated tube, the corrugated tube is bent. Even if the angle is not previously formed by bending, the bending direction of the corrugated tube can be regulated. In addition, since a plurality of continuous ribs and a plurality of opposing ribs are provided, the bending radius of the corrugated tube can be controlled by changing the number of ribs.

The embodiment of the present invention is shown and it is a top view of a corrugated tube. The embodiment of the present invention is shown and is a side view of a corrugated tube. FIG. 3 shows an embodiment of the present invention and is a cross-sectional view of the corrugated tube taken along line AA in FIG. 2. The other embodiment of this invention is shown and it is a perspective view of the corrugated tube which has a straight part between a bellows part and a bellows part. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention and is a perspective view illustrating a state in which a corrugated tube is attached to an automobile or an automobile part. It is a top view of the conventional corrugated tube. It is a side view which shows the state which attached the conventional corrugated tube bent three-dimensionally in the buffer member vicinity. It is a top view of the other conventional corrugated tube. It is a side view which shows the state which attached the other conventional corrugated tube bent three-dimensionally in the buffer member vicinity. It is a perspective view of the other conventional corrugated tube. It is an enlarged plan view and a sectional view of another conventional corrugated tube.

  The present invention relates to a corrugated tube 10 made of a synthetic resin. An embodiment of the corrugated tube 10 used in a fuel system for automobiles will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the corrugated tube 10 according to the embodiment of the present invention has straight cylindrical mounting portions 12 and 12 having no bellows at both ends. The attachment parts 12, 12 are connected to other members to which the corrugated tube 10 is attached, for example, a canister or an intake pipe. In that case, since each of the attachment portions 12 and 12 is different in that the attachment direction and the attachment position are shifted vertically or horizontally, it is necessary to bend the corrugated tube 10.

A bellows portion 13 is formed between the attachment portion 12 and the attachment portion 12. The bellows portion 13 has mountain portions 14 and valley portions 15 formed alternately.
In the present embodiment, the bellows portion 13 is divided into three portions, and ribs and opposing ribs are respectively formed with predetermined lengths.

  First, the first rib 16 and the first opposing rib 17 will be described. The 1st rib 16 and the 1st opposing rib 17 are formed in the part (left-side front-end | tip in FIG. 1) adjacent to the attaching part 12 of the bellows part 13. As shown in FIG. As shown in FIG. 3, the first rib 16 is formed integrally with the valley 15 and connects the peaks 14 on both sides. A plurality of first ribs 16 are formed continuously in a straight line beyond the peak portion 14 in the longitudinal direction. In the present embodiment, twelve are formed continuously, but the number of continuous ones can be selected as appropriate.

  The first opposing rib 17 is formed at the same position on the opposite side of the first rib 16 in the radial direction, that is, at the portion of the bellows portion 13 on the opposite side of 180 degrees. Similarly, in the present embodiment, 12 first opposing ribs 17 are continuously formed.

  Further, in the same manner as the first rib 16 and the first opposing rib 17, the second rib 18 and the second opposing rib 19 are formed on the bellows portion 13 that is slightly apart from the portion where the first rib 16 and the first opposing rib 17 are formed. Is formed. That is, between the first rib 16 and the first opposing rib 17 and between the second rib 18 and the second opposing rib 19, there is a portion of only the bellows portion 13 where no rib is formed.

  Further, like the first rib 16 and the first opposing rib 17, the third rib 20 and the third opposing rib 21 are formed on the bellows portion 13 slightly apart from the portion where the second rib 18 and the second opposing rib 19 are formed. Is formed. Similarly, between the 2nd rib 18 and the 2nd opposing rib 19, and the 3rd rib 20 and the 3rd opposing rib 21, there is a part only of the bellows part 13 in which a rib is not formed, The tip of the third opposing rib 21 is formed to the vicinity of the other mounting portion 12.

  Therefore, as shown in FIGS. 1 and 2, when the corrugated tube 10 is mounted by the mounting portions 12, 12 at both ends, the mounting portions 12, 12 have different mounting directions and mounting heights. The portion where the first opposing rib 17 is formed maintains a straight shape without bending, and the bellows portion 13 between the first rib 16 and the second rib 18 is bent. Similarly, the portion where the second rib 18 and the second opposing rib 19 are formed maintains a straight shape without bending, and the bellows portion 13 between the second rib 18 and the third rib 20 is bent. .

  And the part in which the 3rd rib 20 and the 3rd opposing rib 21 were formed is the same plane direction as the 3rd rib 20 and the 3rd opposing rib 21 was formed (the perpendicular direction of the paper surface in FIG. 1, the paper surface in FIG. 2). It is bent in the direction perpendicular to the same plane direction as the third rib 20 and the third opposing rib 21 are formed without bending in the vertical direction.

As described above, when the rib of the corrugated tube 10 and the opposing rib are provided at the same position on the opposite side in the radial direction, that is, on the opposite side of 180 degrees, the rib is not formed in the same plane direction as that formed. It can be bent in the same plane direction and perpendicular direction. Moreover, the length which does not bend is controllable by the length which provided the rib and the opposing rib.
For this reason, the corrugated tube 10 can be attached without being brought into contact with the buffer member 1 by regulating the bending direction of the corrugated tube 10 without previously forming the bending angle of the corrugated tube 10 by bending.

  Further, the portion of the corrugated tube 10 where the first rib 16 and the first opposing rib 17 are formed, the portion where the second rib 18 and the second opposing rib 19 are formed, or the third rib 20 and the third opposing rib. The ribs 21 and the opposing ribs of the portion 21 are formed at different angles with respect to the central axis of the corrugated tube 10, that is, at different outer peripheral portions in the longitudinal direction of the corrugated tube 10. In this case, the bending direction of the corrugated tube 10 can be changed for each portion of the corrugated tube 10, and the corrugated tube 10 can be bent and attached three-dimensionally.

On the other hand, the portion of the corrugated tube 10 where the rib and the opposing rib are not formed can be bent freely, and if the length of the portion where the rib and the opposing rib are not formed is increased, the corrugated tube 10 can be bent greatly. If so, the turning angle can be reduced.
For this reason, the attachment direction at both ends of the attachment portion 12 is different, whereby bending stress is applied to the corrugated tube 10, the bending angle and direction are controlled by the position and length of the rib and the opposing rib, and the buffer member 1 is not contacted. The corrugated tube 10 can be attached to.

  As another embodiment of the present invention, as shown in FIG. 4, in the corrugated tube 10, the bellows portion 13 has a straight portion 22 in the middle, and a mounting clamp (not shown) is attached to the straight portion 22. it can. In this case, the first rib 16 and the first opposing rib 17 can be formed over the entire bellows part 13 in front of the straight part 22 (left side in FIG. 4), and behind the straight part 22 (FIG. 4). The second rib 18 and the second opposing rib 19 can be formed over the entire bellows portion 13.

At this time, the first rib 16 and the first opposing rib 17 are different from each other in the second rib 18 and the second opposing rib 19 with respect to the central axis of the corrugated tube 10, in this embodiment, approximately 90 degrees. Is formed.
For this reason, the bellows portion 13 formed with the first rib 16 and the first opposing rib 17 can be bent in the X direction shown in FIG. 4, but cannot be bent in the Y direction shown in FIG. . Further, the bellows portion 13 formed with the second rib 18 and the second opposing rib 19 can be bent in the Y direction shown in FIG. 4, but cannot be bent in the X direction shown in FIG.

  And when attaching this corrugated tube 10 to another component, for example, the attachment part 12 of one end is attached to an attachment member, and the bellows part 13 in which the 1st rib 16 and the 1st opposing rib 17 were formed is set to X. After bending in the direction, the straight portion 22 is fixed to another member with a clip (not shown) or the like. And the bellows part 13 in which the 2nd rib 18 and the 2nd opposing rib 19 were formed is bent to a Y direction, and the other attaching part 12 is attached to another attaching member.

  Then, since the central portion of the corrugated tube 10 can be held by the straight portion 22, the central portion of the corrugated tube 10 is fixed, and the bending direction and angle can be controlled more reliably, and the vibration of the corrugated tube 10 and the buffer member Contact with 1 and wear can be prevented.

A case where the corrugated tube 10 is attached to an actual automobile part will be described with reference to FIG.
The corrugated tube 10 is attached by connecting an evaporative gas recovery device (ORVR) 30 and a valve 40 attached to the canister. Fuel gas passes through the corrugated tube 10. It can also be attached to the mouth port of a blister port or inlet pipe.

  Since the connecting portion 31 of the canister 30 and the connecting portion 41 of the valve 40 have different heights from the direction in which the connecting portion 31 faces, the corrugated tube is attached to the connecting portions 12 and 12 of the corrugated tube 10. 10 bends three-dimensionally. However, the corrugated tube 10 can be bent at a predetermined direction and angle by the first rib 16, the first opposing rib 17, the second rib 18, and the second opposing rib 19, and is attached so as not to contact the buffer member 1. It is done.

The corrugated tube 10 can be formed of a synthetic resin having flexibility and a predetermined strength. For example, it can be formed of polyethylene or high density polyethylene (HDPE). In this case, it is possible to obtain a corrugated tube 10 that is excellent in flexibility and durability and excellent in fuel oil resistance and chemical resistance.
In addition, a synthetic resin such as polyacetal or polyamide, which is a fuel oil resistant material, may be used.

  The corrugated tube 10 can be formed of a synthetic resin layer having a multilayer structure. When formed in a multi-layer configuration, for example, the central layer is made of ethylene vinyl alcohol copolymer (EVOH) or nylon and is formed of a modified polyethylene on and under the barrier layer to prevent fuel permeation. And an outer layer formed of high-density polyethylene (HDPE) on each outer surface of the adhesive layer. In this case, the corrugated tube 10 having low flexibility and excellent flexibility and durability can be obtained by combining various synthetic resins.

10 Corrugated tube 12 Mounting part 13 Bellows part 16, 18, 20 Rib 17, 19, 21 Opposing rib

Claims (5)

In the corrugated tube made of synthetic resin,
Both ends have cylindrical attachment portions, a bellows portion is formed between the attachment portions, and a plurality of continuous ribs connecting the peak portions of the bellows portion to the predetermined plurality of portions of the bellows portion, and the ribs Is a corrugated tube having a bellows part, wherein a plurality of opposed ribs are formed at the same position on the opposite side in the radial direction.   The ribs and opposed ribs formed in other predetermined portions of the bellows part are different in angle with respect to the central axis of the corrugated tube with respect to the ribs and opposed ribs formed in the predetermined part of the bellows portion. The corrugated tube according to claim 1, wherein the corrugated tube is formed at a peak portion of the bellows portion.   The corrugated tube according to claim 1 or 2, wherein the corrugated tube is made of polyethylene or high-density polyethylene (HDPE).   The said corrugated tube is a corrugated tube as described in any one of Claim 1 thru | or 3 formed with the synthetic resin layer of the multilayer structure.   The corrugated tube according to any one of claims 1 to 4, wherein the bellows part has a straight part in the middle, and an attachment clamp is attached to the straight part.

Images