JP2010169175A - Hose fastening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain in a necessary and sufficient manner a fastening force for a hose by diameter-contracting a clip in a necessary and sufficient manner, even when the hose is diameter-contracted with the lapse of time, in hose connection-fastening structure constituted to prevent the hose from coming off, by a clip. <P>SOLUTION: The hose 12 engaged with one end part of a pipe 11 is prevented from coming off, by the clip 13 assembled on the hose 12 to fasten the hose 12 by diameter contraction from an outer circumference. The pipe 11 is attached to a pipe attaching part, using a flare nut 14 in a flare part formed in the other end part. The clip 13 is provided integrally with a hook 13a1 allowing the diameter contraction of the clip 13 to the hose 12, and for regulating axial-directional movement separated from the flare nut 14 of the clip 13. The hook 13a1 is formed into an L-shape, and is engaged with an L-shaped cutout 14b1 provided in the flare nut 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hose fastening structure configured to prevent a hose fitted on one end of a pipe from being detached by a clip assembled on the hose and tightened by reducing the diameter of the hose from the outer periphery. .

  This type of hose fastening structure is described in, for example, Patent Document 1 below. In the hose fastening structure described in Patent Document 1, an engagement provided on a clip (described as a hose fastener) is provided. By engaging the portion with the engaged portion provided on the outer peripheral surface of the other end of the pipe, the function of preventing the hose from coming off is secured.

JP 2006-57798 A

  In the hose fastening structure described in Patent Document 1 described above, when engagement holes formed in a plurality of protrusions provided on a clip (hose fastener) are employed as the engagement portion, As the engaged portion, a plurality of engaging projections formed on the outer peripheral surface of the pipe at the same interval as the engaging hole are adopted, and the engaging portion is formed along the circumferential direction of the clip (hose fastener). When the C-shaped protruding rib rib is adopted, a concave groove formed along the circumferential direction on the outer peripheral surface of the pipe is adopted as the engaged portion, and the engaging portion is When a C-shaped concave groove formed along the circumferential direction of the clip (hose fastener) is adopted, it is formed along the circumferential direction on the outer peripheral surface of the pipe as the engaged portion. Convex ribs are used.

  For this reason, in the hose fastening structure described in the above-mentioned Patent Document 1, the clip (hose fastener) cannot reduce the diameter sufficiently and sufficiently with respect to the hose, and the hose is reduced in diameter due to secular change. In this case, the tightening force of the hose by the clip (hose fastener) is reduced, so that the hose is easily removed from the pipe.

  The present invention has been made to solve the above-described problem (decrease in tightening force of the hose due to the clip), and a hose fitted on one end of a pipe is assembled on the hose. The hose fastening structure is constructed so that it is prevented from coming off by a clip that is tightened by reducing the diameter from the outer periphery, and the pipe is assembled to the pipe mounting portion using a flare nut at the flare portion formed at the other end portion. The clip or the flare nut is integrally provided with a hook that allows the clip to be reduced in diameter relative to the hose and restricts the axial movement of the clip away from the flare nut. There is a feature.

  In this case, the hook provided integrally with the clip is formed in an L shape extending in the axial direction from the circular tightening portion of the clip and extending in the circumferential direction, and the L provided on the flare nut. When it is at the detaching position, it engages with the letter-shaped notch so that it can be fitted and detached in the axial direction, and when it is fitted at the detaching position, it engages rotatably toward the engaging position. When in the aligned position, it is also possible to engage in an axially immovable manner.

  In the hose fastening structure according to the present invention, the hook provided integrally with the clip or the flare nut allows the clip to be reduced in diameter relative to the hose and restricts the axial movement away from the clip flare nut. For this reason, even when the hose is reduced in diameter due to secular change, the clip is reduced in diameter as necessary and sufficiently maintains the tightening force of the hose. As a result, the function of preventing the hose from being detached by the clip is stably maintained for a long period of time.

1 is a partially cutaway view schematically showing an embodiment of a hose fastening structure according to the present invention. It is a principal part enlarged view of the pipe, hose, clip, and flare nut shown in FIG. FIG. 3 is a left side view of FIG. 2. It is a perspective view of the clip simple substance shown in FIGS. It is a figure which shows the relationship between the hook of a clip, and the notch of a flare nut. It is the principal part enlarged view which showed schematically other embodiment of the hose fastening structure by this invention. FIG. 7 is a left side view of FIG. 6.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 schematically show an embodiment of a hose fastening structure according to the present invention. In this hose fastening structure, a hose 12 fitted on one end 11a of a pipe 11 A clip 13 that is assembled on the end 12a and reduces the diameter of the hose 12 from the outer periphery and tightens the hose 12 prevents the hose 12 from coming off. The hose 12 is made of an elastically deformable material (for example, a rubber material).

  The pipe 11 is made of metal (for example, copper), and is connected to a pipe mounting portion 15 (for example, a control valve body of a hydraulic power steering for a vehicle) using a flare nut 14 at a flare portion 11b1 formed at the other end portion 11b. It is assembled. In the state shown in FIG. 1, that is, in the state where the flare nut 14 is screwed to the female screw portion 15a of the pipe mounting portion 15 by the male screw portion 14a, the flare portion 11b1 is the male screw of the flare nut 14. It is liquid-tightly sandwiched between the tip of the portion 14 a (a tapered hole is formed) and the tapered portion 15 b of the pipe mounting portion 15.

  The clip 13 is made of spring steel, and in a free state (the state shown in FIG. 4), a circular tightening portion 13a capable of tightening the hose 12 with a necessary and sufficient diameter reduced from the outer periphery, and the circular tightening. The portion 13a is provided with a U-shaped gripping portion 13b and an I-shaped gripping portion 13c capable of expanding the diameter, and the circular fastening portion 13a is integrally provided with a hook 13a1.

  The hook 13a1 allows the diameter of the clip 13 to be reduced with respect to the hose 12, and restricts the axial movement of the clip 13 away from the flare nut 14, and extends in the axial direction from the axial end of the circular fastening portion 13a. And formed in an L shape extending in the circumferential direction. The hook 13a1 is fitted in the axial direction when the hook 13a1 is in the detaching position (for example, the position shown in FIG. 5A) with respect to the L-shaped notch 14b1 provided in the hexagonal portion 14b of the flare nut 14. In a state where it is detachably engaged and fitted in the detaching position (position shown in FIG. 5B), it engages rotatably toward the engaging position (position shown by a solid line in FIG. 2). When in the engaged position, it is engaged so as to be immovable in the axial direction as shown in FIG.

  In this embodiment configured as described above, the hook 13a1 provided integrally with the clip 13 allows the diameter of the clip 13 to be reduced with respect to the hose 12, and allows the clip 13 to move away from the flare nut 14 in the axial direction. regulate. For this reason, even when the diameter of the hose 12 is reduced due to aging, the circular fastening portion 13a of the clip 13 reduces the diameter sufficiently and sufficiently maintains the fastening force of the hose 12. Thereby, the retaining function of the hose 12 by the clip 13 is stably maintained for a long time.

  In the above-described embodiment, the hook 13 a 1 that allows the clip 13 to be reduced in diameter relative to the hose 12 and restricts the axial movement of the clip 13 away from the flare nut 14 is provided integrally with the circular fastening portion 13 a of the clip 13. However, instead of this, the hook 16 shown in FIGS. 6 and 7 may be employed. The hook 16 shown in FIGS. 6 and 7 is a metal plate that allows the clip 13 to be reduced in diameter relative to the hose 12 and restricts the axial movement of the clip 13 away from the flare nut 14. The end portion 16a is fixed to the outer periphery of the hexagonal portion 14b of the nut 14 by welding.

  Further, the hook 16 is formed in an L-shape extending in the axial direction and extending in the circumferential direction, and can be engaged with and detached from the U-shaped gripping portion 13 b of the clip 13. In the state of engagement with the gripping part 13b (the state shown in FIGS. 6 and 7), the clip 13 is allowed to move in the axial direction away from the flare nut 14 while allowing the clip 13 to be reduced in diameter relative to the hose 12. It is regulated. For this reason, also in the embodiment shown in FIGS. 6 and 7, the same operational effects as those of the above-described embodiment shown in FIGS. 1 to 5 can be obtained.

DESCRIPTION OF SYMBOLS 11 ... Pipe, 11a ... One end part of a pipe, 11b ... Other end part of a pipe, 11b1 ... Flare part, 12 ... Hose, 12a ... End part of hose, 13 ... Clip, 13a ... Circular clamping part, 13b ... U-shape -Shaped gripping part, 13c ... I-shaped gripping part, 13a1 ... hook, 14 ... flare nut, 14a ... male screw part, 14b ... hexagonal part, 14b1 ... L-shaped notch, 15 ... pipe attachment part, 15a ... female screw Part, 15b ... taper part, 16 ... hook

Claims (2)

A hose fastening structure configured to prevent a hose fitted on one end of a pipe from being attached with a clip that is assembled on the hose and is tightened by reducing the diameter of the hose from the outer periphery,
The pipe is assembled to a pipe mounting portion using a flare nut at a flare portion formed at the other end, and the clip or the flare nut allows a reduction in diameter of the clip with respect to the hose, and A hose fastening structure, wherein a hook for restricting axial movement of the clip away from the flare nut is integrally provided.   The hose fastening structure according to claim 1, wherein the hook integrally provided on the clip is formed in an L shape extending in the axial direction from the circular fastening portion of the clip and extending in the circumferential direction, The L-shaped notch provided in the flare nut engages in an axially detachable manner when in the detaching position, and rotates toward the engaging position when fitted in the detaching position. A hose fastening structure, wherein the hose fastening structure is engaged so as to be non-movable in the axial direction when in the engaged position.

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