JP2000337557A - Rotation preventing structure for resin tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotation preventing structure capable of preventing a resin tube from rotational deviation. SOLUTION: When a resin tube 1 having a corrugated shape partially is laid around in a bent condition through a clamp, a ring-shaped recess 3 furnished with a diametrically enlarged portion 3a is formed on the peripheral surface of resin tube 1 free of corrugated shape while the inner surface of clamp embracing the resin tube 1 is furnished with a ribbed wall 7 to be fitted in the ring- shaped recess 3 and a receptacle hole 8 to receive the diametrically enlarged portion 3a of the recess 3, and thereby the ribbed wall 7 on the clamp side is fitted into the recess 3 and also the diametrically enlarged portion 3a is received by the receptacle hole 8 on the clamp side, and therefore, if the clamp itself is fixed to the specified position with this condition held, it is possible to prevent the resin tube 1 from rotational deviation certainly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a structure for preventing rotation of a resin tube provided in a bent state in an engine room of an automobile.

[0002]

2. Description of the Related Art When a clamp is attached to a corrugated tube in which annular concave and convex portions are continuously formed at a constant pitch in the axial direction, the above-mentioned irregularities are usually provided on the inner peripheral surface side of the clamp which holds the corrugated tube. By forming a rib wall that fits into the concave portion of the portion, and by fitting the rib wall into the concave portion of the concave and convex portion, it is possible to prevent the movement of the clamp in the axial direction of the corrugated tube, or conversely, to prevent the movement of the corrugated tube. A slit is formed in the axial direction, the upper side and the lower side are shifted by one pitch from the slit, and the concavo-convex portion is formed into a continuous spiral, so that the clamp is rotated on the corrugated tube and moved in the axial direction. There are some that can be caused to occur (see JP-A-9-178049).

[0003]

Therefore, in the relationship between the corrugated tube and the clamp, various measures have been taken in the axial direction of the corrugated tube. In fact, little effort has been made to prevent this. However, in a resin tube partially having a corrugated shape (annular uneven portion), there are many cases where piping is provided in a bent state through a clamp. The necessity arises to prevent the resin tube from rotating due to the corrugated shape.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been developed in view of the above circumstances, and has a corrugated shape when a resin tube having a corrugated shape is piped in a bent state through a clamp. An annular concave portion having an enlarged diameter portion is formed on an outer peripheral surface of a resin tube not to be received, and a rib wall fitted into the annular concave portion and an enlarged diameter portion of the annular concave portion are received on an inner peripheral surface holding the resin tube of the clamp. The structure which forms a mouth was adopted.

Therefore, in the present invention, in addition to fitting the rib wall on the clamp side into the annular concave portion of the resin tube, the enlarged diameter portion of the annular concave portion is received in the receiving port on the clamp side. If the clamp itself is fixed at a predetermined position in such a state, it is possible to reliably prevent the resin tube from being rotationally displaced.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to a preferred embodiment, in which a rotation preventing structure according to the embodiment is formed by clamping a resin tube partially having a corrugated shape. It has been developed with the intention of effectively preventing the rotational displacement of the resin tube itself by organically combining the resin tube and the clamp when piping in a bent state through the intermediary.

Therefore, FIG.
As shown in FIG. 2, two annular convex portions 2 are formed at regular intervals on an outer peripheral surface held by a clamp having no corrugated shape 4, and a pair of expanded portions facing each other between the annular convex portions 2. A configuration in which an annular concave portion 3 having a diameter portion 3a is formed and only the cross-sectional shape of the annular concave portion 3 is made different is positively adopted.

As shown in FIG. 2, the clamp 5 is integrally formed of synthetic resin in a half-split state,
Of a pair of clamp pieces 5A and 5B connected via
Regarding one clamp piece 5A, two rib walls 7 to be fitted into the corresponding annular concave portions 3 of the resin tube 1 are formed on the inner peripheral surface of the curved upper portion along the circumferential direction. A receiving port 8 for receiving the enlarged diameter portion 3a is defined between the rib walls 7, and a temporary fixing claw 9 and a screw hole 10 for final fixing are formed in a linear lower portion. As for the piece 5B, similarly, two rib walls 7 to be fitted into the corresponding annular concave portions 3 of the resin tube 1 are formed on the inner peripheral surface of the curved upper portion, and between the respective rib walls 7. A receiving hole 8 for receiving the enlarged diameter portion 3a is formed, and an engagement hole 11 for engaging the temporary fixing claw 9 in a linear lower portion, and a screw hole 10 for final fixing corresponding to the screw hole 10 are formed.
Is formed.

Incidentally, a tapered shape 7a similar to the shape of the enlarged diameter portion 3a of the annular concave portion 3 is provided to the edge of the rib wall 7 defining each of the receiving ports 8 of the clamp pieces 5A and 5B. Each receiving port 8 is formed so as to be located on both sides of the hinge portion 6. Furthermore, each clamp piece 5A
5B, the notch 6
The clamp 5 itself is arranged outside by presenting a, and the clamp pieces 5A and 5B are greatly widened so that they can be easily assembled on the outer periphery of the resin tube 1.

Therefore, under the rotation preventing structure having such a configuration, each of the clamp pieces 5A and 5B of the clamp 5 is connected to the hinge 6
While being opened through the annular concave portion 3 formed between the two annular convex portions 2, and the temporary fixing claw 9 formed on one clamp piece 5 </ b> A side is placed on the other clamp piece 5 </ b> B side. When the clamp pieces 5A and 5B are engaged with each other, the clamp pieces 5A and 5B are closed to each other, and the clamp 5 is temporarily fixed to the resin tube 1. As shown in FIG. 3, each rib wall 7 of the pair of clamp pieces 5A and 5B fits into the annular concave portion 3 on the resin tube 1 side, and at the same time, each enlarged diameter portion 3a of the annular concave portion 3 is located between the rib walls 7. The tapered shape 7 is formed in the defined receiving port 8.
It will be accepted while being held down by a.

Then, this time, using the corrugated shape 4 formed in a part thereof, as shown in FIG. 4, the resin tube 1 is piped in a bent state, and thereafter, although not specifically shown, By using the screw holes 10 of the clamp pieces 5A and 5B that match each other, each of the clamps 5 is screwed to the corresponding panel or the engine body, whereby the resin tube 1 is fixed in its bent state, Since the pair of enlarged diameter portions 3a are received in the corresponding receiving openings 8 of the respective clamp pieces 5A and 5B, the rotational displacement of the resin tube 1 can be reliably prevented, and there is no fear that unnecessary rattling occurs.

In the present embodiment, the hinge 6
Since the receiving ports 8 are formed on both sides of the resin tube 1, even if a rotational moment is applied to the resin tube 1, a sliding load is applied to the clamp pieces 5 </ b> A and 5 </ b> B instead of an open load.
A high rotation preventing force can be obtained without opening the mouth. In addition, since the enlarged diameter portion 3a and the receiving port 8 are in contact with each other in a tapered shape, they are in close contact with each other, and from this point, a high rotation prevention state can be ensured.

In the above-described embodiment, the clamp 5 itself is fixed to the panel or the engine body by screwing. However, as shown in FIG. 5, each of the clamp pieces 5A and 5B is fixed. A clip 12 having a C-shaped holding portion 12a and an anchor-shaped leg portion 12b is attached to the screw hole 10, and another pipe or the like is fitted to the C-shaped holding portion 12a of the clip 12. Accordingly, it is optional to configure the clamp 5 to be fixed to the pipe or the like depending on the implementation.

[0014]

As described above, according to the present invention, by adopting the above structure, in addition to the fitting of the rib wall on the clamp side into the annular concave portion of the resin tube, the enlarged diameter portion of the annular concave portion is inserted into the receiving port on the clamp side. If the clamp itself is fixed at a predetermined position in such a state, the rotation of the resin tube can be reliably prevented.

[Brief description of the drawings]

FIG. 1A is a plan view of a resin tube provided in a rotation prevention structure according to an embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view taken along line AA of FIG. 1A.

2 (A) is a front view of the same clamp, and FIG. 2 (B) is FIG. 2A
It is a BB line enlarged end view.

FIG. 3 is a cross-sectional view showing a state in which a clamp is temporarily fixed to a resin tube.

FIG. 4 is an explanatory diagram illustrating a bent pipe state of a resin tube.

FIG. 5 is a cross-sectional view showing another example of a clamp with a temporary fixing state with respect to a resin tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin tube 2 Annular convex part 3 Annular concave part 3a Enlarged diameter part 4 Corrugated shape 5 Clamp 5A One clamp piece 5B The other clamp piece 6 Hinge part 7 Rib wall 7a Tapered shape 8 Reception port 9 Temporary claw 10 Screw hole 11 Inlet 12 clips

Claims (1)

[Claims] When a resin tube partially having a corrugated shape is piped in a bent state through a clamp, an annular concave portion having an enlarged diameter portion is formed on the outer peripheral surface of the resin tube having no corrugated shape. A structure for preventing rotation of a resin tube, wherein a rib wall fitted into the annular recess and a receiving port for receiving an enlarged diameter portion of the annular recess are formed on an inner peripheral surface of the clamp holding the resin tube.