JP2009085345A - Quick connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a quick connector capable of effectively preventing relative rotation to the quick connector of a resin tube, and capable of favorably preventing abrasion of a resin tube inner face due to the rotation and leakage of fluid due to the abrasion. <P>SOLUTION: The quick connector 16 has a press-in fixing part 26 into the resin tube 10, and an insertion part 24 of a counterpart pipe. An annular biting part 28-3 in the most base end side of the press-in fixing part 26 of a plurality of annular biting parts 28-1, 28-2, 28-3 is composed as a detent shaped polygonal as seen from an axial direction, with respect to the resin tube 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a quick connector for connecting a resin tube used for piping and a mating pipe.

2. Description of the Related Art Conventionally, quick connectors that can be quickly connected with a single touch are widely used as joints for connecting, for example, automobile piping tubes, particularly resin tubes, to mating pipes.
This type of quick connector is provided with (a) an annular biting portion having a shape protruding radially outward along the outer peripheral surface at a plurality of positions in the axial direction, and the annular biting portion is bitten into the inner surface of the resin tube. A press-fit fixing part that is press-fitted and fixed inside the resin tube in a state; (b) an insertion part for inserting the mating pipe into the inner insertion space in the axial direction; and (c) an elastic deformation in the radial direction. An engagement part that engages the engaged part of the inserted mating pipe in the axial direction to prevent the insertion part from coming off from the mating pipe, and the press-fit fixing part is press-fitted and fixed to the resin tube in advance. By inserting the mating pipe into the insertion portion, the resin tube and the mating pipe can be connected with one touch.

  The connection between the resin tube and the mating pipe using this quick connector has the advantage that they can be easily connected with a single touch, while the quick connector rotates relative to the mating pipe due to engine vibration or vehicle body vibration. Therefore, when the quick connector rotates relative to each other, the seal ring such as an O-ring held on the inner peripheral surface of the insertion portion is worn and sealed to seal between the insertion portion and the mating pipe. There is a problem in that there is a risk that it may lead to leakage of internal fluid.

For example, when a resin tube used for fuel transportation piping is connected to a mating pipe with a quick connector, there is a possibility that a decrease in sealing performance due to wear of the seal ring may lead to fuel leakage.
Various types of quick connectors that prevent rotation of the quick connector with respect to the mating pipe have been proposed and actually implemented.

For example, this type of rotation prevention structure is disclosed in the following Patent Document 1, Patent Document 2, and Patent Document 3.
Specifically, in Patent Document 1, the clip is constrained so that the quick connector cannot be rotated relative to the clip, and the mating pipe is bent and engaged with the notch of the clip. The point which came to prevent turning is disclosed.

  In Patent Document 2, the first bracket is caulked and fixed to the quick connector, while the second bracket is welded and fixed to the mating pipe, and the first bracket and the second bracket are connected to each other. It is disclosed that the pieces are fastened with bolts or the like to prevent the mating pipe and the quick connector from rotating.

  Further, in Patent Document 3, a rotation stopper is mounted across the quick connector and the mating pipe that forms a bent shape, and the quick connector and the mating pipe are prevented from rotating by using the bent shape of the mating pipe. The point is disclosed.

On the other hand, the actual situation is that no special measures are taken between the quick connector and the resin tube to prevent rotation.
This is to press-fit the press-fit fixing part of the quick connector into the inside of the resin tube, and fix the protruding annular enveloping part provided on the outer peripheral surface of the press-fit fixing part to the resin tube so as to be eaten into the inner surface of the resin tube. This is thought to be due to the fact that strong pressing force is generated between the press-fitting fixing part and the resin tube, and both are strongly fixed, but in reality the stress relaxation that occurs over time in the resin tube, etc. Because of this, when a force is applied to the resin tube in the rotational direction due to engine vibration, vehicle body vibration, etc., the resin tube may repeatedly shift in the rotational direction with respect to the press-fit fixing part. The inner surface of the resin tube is scraped or worn by the tip (outer peripheral edge) of the annular biting portion in a state where the inner surface of the resin tube has bitten into the inner surface. Specifically occurs a minute gap between the press-fit fixing portion and the resin tube inner surface, it has a possibility that the gap leads to leakage or gas permeation of a fluid such as a fuel.

  Particularly in the case of resin tubes for fuel transportation piping, fuel permeation resistance (gas permeation resistance) has been strongly demanded from the viewpoint of environmental protection in recent years. High resin materials have come to be used (resin materials with high permeation resistance are generally high in rigidity). In this case, a strong compressive force can be obtained during press-fitting, while a resin tube made of such a resin material Then, stress relaxation is likely to occur over time after press-fitting, and this stress relaxation causes the resin tube to repeatedly deviate in the rotational direction with respect to the annular bite portion of the quick connector, particularly under conditions where heat is applied. As a result, the inner surface of the resin tube is easily scraped or worn by the annular biting portion, which may lead to fuel leakage or gas permeation.

Assuming such a case, a rubber seal ring such as an O-ring is held on the outer peripheral surface of the press-fit fixing portion, and the space between the press-fit fixing portion and the inner surface of the resin tube is sealed with the seal ring. Conventionally done.
For example, Patent Document 4 below discloses that the O-ring seals between the press-fit fixing portion and the inner surface of the resin tube.

  However, even when a rubber seal ring such as an O-ring is interposed between the press-fit fixing part and the inner surface of the resin tube in this way, the resin tube repeats in the rotation direction with respect to the quick connector, ie, the press-fit fixing part. When the misalignment occurs, the seal ring itself is worn, and the sealing performance of the seal portion by the seal ring is deteriorated, which may lead to fluid leakage.

  As a means for preventing rotation of the resin tube with respect to the quick connector, the resin tube is bent in an L-shape in the vicinity of the end that is the fixing portion to the mating pipe, and a portion away from the bent portion is fixed. It is also conceivable to fix it to the vehicle body. In this case, both the quick connector and the resin tube itself are prevented from rotating with respect to the mating pipe.

  However, in this case, the resin tube is fixed in the middle, so that the vibration absorption performance by the resin tube is impaired, and the resin tube is bent and fixed by the fixture itself is a piping layout. It becomes the upper restriction, and the cost required for the fixing tool for fixing the resin tube or the work for fixing with the fixing tool is necessary when assembling to the vehicle, and the assembling work becomes complicated. There arises a problem that the assembling cost becomes high.

Japanese Patent Laid-Open No. 9-269088 JP 2001-235074 A JP 2004-156712 A JP 2006-292054 A

  The present invention, against the background of the above circumstances, can effectively prevent relative rotation of the resin tube with respect to the quick connector, and can prevent the resin tube inner surface wear due to the rotation and leakage of fluid due to the wear. The purpose of this invention is to provide a quick connector that can be used.

  Thus, according to the first aspect of the present invention, (a) an annular biting portion having a shape projecting radially outward along the outer peripheral surface is provided at a plurality of locations in the axial direction, and the annular biting portion is provided on the inner surface of the resin tube. (B) an insertion part for axially inserting the mating pipe into the inner insertion space, and (c) elastic deformation in the radial direction. An engaging portion that is axially engaged with an engaged portion of the inserted mating pipe and prevents the inserting portion from coming off from the mating pipe, and the resin tube and the In the quick connector for connecting to the mating pipe, the rotation of the annular encircling portion on the most proximal side of the press-fit fixing portion of the plurality of annular encroaching portions with respect to the resin tube having a non-circular shape when viewed in the axial direction It is comprised as a part.

  According to a second aspect of the present invention, in the first aspect, the annular biting portion as the rotation stopping portion is formed in a polygonal shape.

  According to a third aspect of the present invention, in the first aspect of the present invention, the annular biting portion as the anti-rotation portion has an elliptical shape.

Effects and effects of the invention

As described above, the present invention is a resin tube having a non-circular shape in the axial view of an annular biting portion on the most proximal side of the press-fit fixing portion among a plurality of annular biting portions of the press-fit fixing portion in the quick connector. It is comprised as a rotation prevention part with respect to.
In the quick connector of the present invention, when the press-fitting fixing portion is press-fitted into the resin tube, the non-circular annular biting portion on the base end side bites into the resin tube inner surface and fits strongly against the resin tube. Thus, the non-circular annular biting portion prevents the positional deviation in the rotation direction around the press-fitting and fixing portion of the resin tube, that is, relative rotation well.

  Therefore, the resin tube repeats relative rotation with respect to the press-fit fixing portion, so that the inner surface of the resin tube can be prevented from being scraped or worn by the annular biting portion. Leakage can be effectively prevented.

  In addition, since the annular biting portion as the non-circular round stop portion also has a function as a bite portion with respect to the inner surface of the resin tube, by providing a stop portion in the press-fit fixing portion, There is no problem that the bonding strength (pullout strength) with the quick connector is lowered, and the same strong bonding strength as in the conventional case can be maintained.

  In addition, since the non-circular annular encroaching portion that functions as a rotation-preventing portion is located at the innermost side when viewed from the resin tube, the annular encroaching portion as the detenting portion is another annular encroachment with respect to the inner surface of the resin tube. This has the advantage of not substantially hindering the biting action by the insert.

In this invention, the cyclic | annular biting part as the said rotation stop part can be made into polygonal shape (Claim 2).
Or the cyclic | annular biting part as a rotation stop part can be made into elliptical shape (Claim 3).
When the annular encroaching part as a rotation stop part is polygonal, when the press-fitting part is press-fitted into a rigid and rigid resin tube and fitted, it may form a polygonal shape with the inner surface of the resin tube. There is a possibility that a minute gap is generated between the annular biting portion as the rotation stop portion.

Specifically, at each corner of the polygonal shape, the annular biting portion and the inner surface of the resin tube are in close contact with each other, but a minute gap may occur between each side of the polygonal shape and the inner surface of the resin tube. (The resin tube has a perfect circular cross section in the shape before press-fitting).
Therefore, when making the annular encroaching part as the rotation stop part into a polygonal shape, it is necessary to strictly determine the shape, dimensions, etc. so that such a gap does not occur.

  On the other hand, when the annular bite portion as the rotation stop portion is formed in an elliptical shape according to claim 3, the resin tube is easily adapted to follow the shape at the time of press-fitting, and therefore the ring bite portion and the resin as the rotation stop portion. Generation of a gap between the inner surface of the tube can be effectively prevented.

However, if the flatness of the elliptical shape is small, the effect of preventing rotation is reduced.
On the other hand, if the flatness is large, the effect of preventing rotation becomes large, but the shape of the resin tube follows the elliptical shape well at the time of press fitting, and it becomes difficult to follow.
In this sense, it is desirable that the elliptical flatness is 0.02 to 0.25.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIGS. 1 and 2, 10 is a resin tube suitable as a fuel transportation pipe, and 12 is a mating pipe (here, made of metal) to which it is connected.
In this embodiment, the resin tube 10 includes a polyamide resin single-layer tube, a fluororesin-polyamide resin multi-layer tube, a polyphenylene sulfide resin-polyamide resin multi-layer tube, and a single-layer and multi-layer structure composed of polyester. The made tube etc. can be used suitably.

The mating pipe 12 is integrally formed with a bulge portion (engaged portion) 14 bulging radially outward along the outer peripheral surface at a position spaced a predetermined distance from the tip.
Reference numeral 16 denotes a quick connector according to this embodiment for connecting the resin tube 10 and the mating pipe 12. Here, the quick connector 16 is made of resin (the material is, for example, a polyamide resin reinforced with glass fiber).

As shown in FIG. 2, the quick connector 16 includes a connector main body 18 having a cylindrical shape as a whole and a retainer 20.
The connector body 18 includes a cylindrical insertion portion 24 for inserting the mating pipe 12 into the inner insertion space 22 and a press-fit fixing portion 26 having a smaller diameter.

The press-fit fixing portion 26 is a portion that is press-fitted into the resin tube 10. The press-fit fixing portion 26 protrudes radially outward along the outer peripheral surface at a plurality of locations on the outer peripheral surface and in the axial direction, and has a sawtooth cross section. An annular biting portion 28-1, 28-2, 28-3 having an acute angle at its tip is formed.
The press-fit fixing portion 26 causes these annular bites 28-1, 28-2, 28-3 to bite into the inner surface of the resin tube 10 when being pressed into the resin tube 10, and is pulled into the resin tube 10 by the biting action. It is fixed to the stop state.

  The insertion portion 24 has a stepped shape, and O-rings 30 and 30 having elasticity as a seal ring and a resin spacer ring 32 are held inside the large diameter portion. When inserted into the insertion space 22, these O-rings 30 elastically contact the outer peripheral surface of the mating pipe 12 to seal between the inner surface of the insertion portion 24 and the outer surface of the mating pipe 12.

  In addition, a resin-made ring-shaped bush 34 is held in the insertion portion 24 in a state of being prevented from coming off inside the right end position in the drawing. Here, the inner diameter of the bush 34 is equal to the inner diameter of the small diameter portion of the insertion portion 24 as shown in FIG.

The connector main body 18 is also provided with a retainer holding portion 36 having a socket shape at the right end of the insertion portion 24 in the drawing.
The retainer holding portion 36 is a portion that holds the retainer 20 in an accommodated state, and the connector main body 18 is connected to the mating pipe 12 via the retainer 20.

  The retainer holding portion 36 is provided with a pair of a window portion 38 that has an arc shape along the circumferential direction and a latch portion 40 that is formed facing the window portion 38 and also has an arc shape in the circumferential direction. The retaining groove 42 of the retainer 20 is fitted to the retaining portion 40 from the inside in the radial direction, whereby the retainer 20 is held in the retainer holding portion 36 in the axially fixed state.

The retainer 20 is a member having a substantially annular shape (C-shaped cross section having a notch at a predetermined circumferential direction) as a whole, and is elastically deformable in the radial direction.
The retainer 20 has an engaging portion 44 on the left end side in the drawing, and is provided with a pair of concave portions 45 having an arc shape in the circumferential direction, and the concave portion 45 has a bulge portion of the mating pipe 12. The mating pipe 14 and the retainer 20 are engaged with each other from the inside in the radial direction, that is, the mating pipe 12 and the connector main body 18 are fixed in an axially prevented state via the retainer 20.

The retainer 20 is provided with an inner circumferential cam surface 46 and an outer circumferential cam surface 48 that are substantially tapered.
Here, the inner circumferential cam surface 46 moves and guides the bulge portion 14 when the mating pipe 12 is inserted in the axial direction, and elastically expands and deforms the entire retainer 20 in the radial direction, thereby deforming the bulge portion 14. It is possible to pass to the position reaching the recess 45.
On the other hand, when the retainer 20 is inserted into the retainer holding portion 36, the outer peripheral cam surface 48 elastically shrinks and deforms the entire retainer 20, and guides the latching groove 42 into the latching portion 40 of the retainer holding portion 36. .

Connection by the quick connector 16 can be performed as follows.
First, the press-fit fixing portion 26 of the quick connector 16 is press-fitted into the resin tube 10, and the quick connector 16 and the resin tube 10 are coupled in advance.
At this time, the annular biting portions 28-1, 28-2, 28-3 of the press-fit fixing portion 26 expand the diameter of the resin tube 10 by press-fitting the press-fit fixing portion 26 into the resin tube 10 as shown in FIG. At the same time as it is deformed, it is in a state of being bitten into its inner surface, and the press-fit fixing portion 26 is fixed to the resin tube 10 in a state of being prevented from coming off in the axial direction.
The press-fit fixing part 26 is press-fitted into the resin tube 10 until the right end of the resin tube 10 in the drawing contacts the insertion part 24.

In this state, when the mating pipe 12 is inserted into the insertion portion 24 of the connector main body 18 (at this time, the retainer holding portion 36 holds the retainer 20 in advance), the inner circumferential cam of the retainer 20 is placed on the bulge portion 14 of the mating pipe 12. The surface 46 hits, and the cam action causes the retainer 20 to expand in a radial direction as a whole, thereby allowing the bulge portion 14 to move leftward in the drawing.
When the bulge portion 14 reaches the position of the recess 45 of the retainer 20, the retainer 20 is reduced in diameter by the elastic restoring force, and at the same time, the bulge portion 14 fits into the recess 45 and is engaged with the engagement portion 44 in the axial direction. Here, the connector main body 18 is prevented from coming off from the mating pipe 12 in the axial direction.
That is, the resin tube 10 and the mating pipe 12 are connected via the quick connector 16.
By using the quick connector 16 in this way, the resin tube 10 can be easily connected to the mating pipe 12 with one touch.

In the present embodiment, of the annular biting portions 28-1, 28-2, 28-3 shown in FIG. 2, the position closest to the distal end of the resin tube 10 in the press-fitted state, that is, the proximal end side of the press-fit fixing portion 26 As shown in FIG. 3B, the annular biting portion 28-3 (the deepest side when viewed from the resin tube 10 side) is a polygonal (here, regular octagonal) resin as viewed in the axial direction. It is configured as a rotation stop for the tube 10.
Here, the annular biting portion 28-3 has a larger diameter than the annular biting portion 28-2 at the left position in the drawing. Specifically, an annular biting portion 28-2 in which the dimension between a pair of corner portions facing each other in the radial direction (between A and E, B and F, C and G, D and H) forms an annular shape. The maximum outer diameter dimension of the annular biting portion 28-1 is also an annular shape.

The dimension between the sides facing each other in the radial direction is the same as the maximum outer diameter of the annular biting portion 28-2.
That is, the annular biting portion 28-3 is formed in a polygonal shape such that the circular shape of the annular biting portion 28-2 is inscribed with respect to each side.
In this embodiment, the cross-sectional shape of each part of the press-fit fixing part 26 excluding the annular biting part 28-3 is a perfect circle.

In this embodiment, when the press-fit fixing portion 26 of the quick connector 16 is press-fitted into the resin tube 10, the resin tube 10 follows the polygonal shape of the annular biting portion 28-3 at the right end position in FIG. The polygonal shape following the shape of the annular biting portion 28-3 in which the shape of the portion that is expanded and deformed following the polygonal shape and fitted into the annular biting portion 28-3 and the vicinity of the front and rear in the axial direction thereof Transforms into
Then, under the deformed state, the inner surface of the portion fitted to the annular biting portion 28-3 comes into close contact with each corner and each side of the annular biting portion 28-3.

As described above, in the quick connector 16 of the present embodiment, when the press-fit fixing portion 26 is press-fitted into the resin tube 10, the base-side polygonal annular biting portion 28-3 is formed on the inner surface of the resin tube 10. The polygonal annular biting portion 28-3 is engaged with the resin tube 10 while being bitten, and the polygonal annular biting portion 28-3 is displaced in the rotational direction around the press-fit fixing portion 26 of the resin tube 10, that is, the relative rotation. Prevent well.
In the present embodiment, when a rotational force is applied to the resin tube 10, a rotation preventing force is applied to the annular biting portion 28-3 as the rotation stop portion to the extent that the resin tube 10 is twisted and deformed. deep.

  Therefore, when the resin tube 10 repeats relative rotation with respect to the press-fit fixing portion 26, the inner surface of the resin tube 10 is prevented from being scraped or worn by the annular biting portion. Thus, it is possible to effectively prevent a gap from occurring, which leads to leakage of internal fluid and gas permeation.

  Further, the annular biting portion 28-3 that functions as a polygonal locking portion also has a function as a biting portion with respect to the inner surface of the resin tube 10, and therefore, by providing a locking portion in the press-fit fixing portion 26, the resin is obtained. The problem that the coupling strength (pullout strength) between the tube 10 and the quick connector 16 is reduced does not occur, and the same strong coupling strength as in the conventional case can be maintained.

  In addition, since the polygonal annular biting portion 28-3 serving as the rotation stop portion is located at the deepest side when viewed from the resin tube 10, the ring biting portion 18-3 as the rotation stop portion is the resin tube 10. This has the advantage of not substantially hindering the biting action by the other annular biting portions 28-1, 28-2 on the inner surface of the.

Here, although the polygonal shape of the annular biting portion 28-3 is a regular octagonal shape, it may be a regular hexagonal shape or other polygonal shapes depending on circumstances.
However, in any case, the shape and dimensions are determined so that the inner surface of the resin tube 10 is in close contact with the annular biting portion 28-3 over the entire circumference in the press-fit state of the press-fit fixing portion 26. It is necessary.

FIG. 4 shows another embodiment of the present invention.
This example is an example in which the shape of the annular biting portion 28-3 serving as the rotation stop portion is an elliptical shape.
Here, the elliptical shape is such that the short diameter b is the same size as the outer diameter of the annular biting portion 28-2 (and the annular biting portion 28-1 having the same diameter), and the long diameter a is larger than this. The shape is determined as follows.

  When the annular biting portion 28-3 serving as a rotation stop portion has a polygonal shape, the press-fit fixing portion 26 is press-fitted into the hard and rigid resin tube 10, and the annular biting portion 28-3 is fitted into the resin tube 10. In some cases, there is a possibility that a minute gap may be generated between the inner surface of the resin tube 10 and the annular biting portion 28-3 as a polygonal stop portion.

Specifically, in each of the polygonal corners A, B, C, D, E, F, G, and H shown in FIG. 3, the annular biting portion 28-3 and the inner surface of the resin tube 10 are in close contact, There is a possibility that a minute gap is generated between each side of the polygonal shape and the inner surface of the resin tube 10 whose cross-sectional shape is a perfect circle before press-fitting.
Therefore, in the case where the annular biting portion 28-3 as the rotation stop portion is formed in a polygonal shape, it is necessary to strictly determine the shape, dimensions, etc. so that such a gap does not occur.

  On the other hand, according to the present embodiment, when the annular biting portion 28-3 as the rotation stop portion has an elliptical shape, the resin tube 10 is easy to conform to and follow the shape when press-fitted. -3 and the inner surface of the resin tube 10 can be effectively prevented from generating a gap.

However, if the flatness of the elliptical shape is small, the effect of preventing rotation is reduced.
On the other hand, if the flatness is large, the effect of preventing rotation is large, but the shape of the resin tube 10 closely follows the elliptical shape during press-fitting and becomes difficult to follow.
In this sense, it is desirable that the elliptical flatness is 0.02 to 0.25.

  In the above-described embodiment, sealing with a seal ring is not performed between the press-fit fixing part 26 and the resin tube 10, but as shown in FIG. An annular groove 52 is formed at a position closer to the tip than -2, and a rubber O-ring 54 as a seal ring is held therein, and the outer surface of the press-fit fixing portion 26 and the resin tube are held by the O-ring 54. It is also possible to seal between the inner surfaces of the ten.

<Experimental example>
The material, thickness, inner diameter, outer diameter of the resin tube 10, the material of the quick connector 16 and the annular biting portion 28-3 are variously changed as shown in Table 1, and the rotational force is applied to the resin tube 10 in the press-fitted state of the quick connector 16. And the rotational torque was measured.
The results are shown in Table 1.

As can be seen from the results in Table 1, in the case of this example, it is possible to prevent the positional deviation in the rotational direction of the resin tube 10 with respect to the quick connector 16 better than that of the comparative example.
In Table 1, the resin tube 10 is twisted in Example 2, Example 3, and Example 4. This is because the resin tube 10 is prevented from rotating with respect to the quick connector 16 as a result. 10 is a twist.

Although the embodiments of the present invention have been described in detail above, these are merely examples.
For example, in the above embodiment, the engaged portion of the mating pipe 12 has a convex shape, but in some cases, the engaged portion of the mating pipe 12 may have a concave shape, and the quick connector has a configuration corresponding to this. It is possible to constitute the engaging portion.
In the above-described embodiment, the retainer 20 is configured separately from the connector main body 18. However, the retainer 20 may be formed integrally with the connector main body 18.

In addition, the shape of the annular biting portion 28-3 as the rotation stop portion is various other non-circular shapes other than the above example, for example, a non-circular shape in which a part is cut off partially flat along the outer peripheral surface. It is also possible to configure this by shape.
Further, in the above-described embodiment, the plurality of annular bites other than the rotation stopper are formed with the same shape and the same size, but they can be formed with different shapes and sizes, and in some cases, a plurality The present invention can be configured in various modifications without departing from the gist of the present invention, such as a non-circular round stop portion.

It is the figure which showed the quick connector which is one Embodiment of this invention in the connection state with the resin tube. It is the figure which exploded and showed the quick connector of the embodiment. It is a principal part enlarged view of the embodiment. It is a principal part enlarged view of other embodiment of this invention. It is a principal part enlarged view of further another embodiment of this invention.

Explanation of symbols

10 Resin tube 12 Mating pipe 14 Bulge part (engaged part)
16 Quick connector 20 Retainer 22 Insertion space 24 Insertion part 26 Press fit fixing part 28-1, 28-2, 28-3 Annular biting part 44 Engagement part

Claims (3)

(A) An annular biting portion having a shape projecting radially outward along the outer peripheral surface is provided at a plurality of positions in the axial direction, and the annular biting portion is bitten into the inner surface of the resin tube. A press-fitting fixing portion that is press-fitted into and fixed to the inner insertion space; (b) an insertion portion that inserts the mating pipe into the inner insertion space in the axial direction; and (c) a mating member that is elastically deformable in the radial direction. In a quick connector for connecting the resin tube and the mating pipe, an engagement portion that axially engages an engaged portion of the pipe and prevents the insertion portion from coming off from the mating pipe. Among the plurality of annular biting portions, the annular biting portion on the most proximal side of the press-fit fixing portion is configured as a non-circular shape rotation stop portion with respect to the resin tube as viewed in the axial direction. Quick connector.   The quick connector according to claim 1, wherein an annular biting portion as the anti-rotation portion has a polygonal shape.   The quick connector according to claim 1, wherein an annular biting portion as the anti-rotation portion has an elliptical shape.

Images