JPH089513Y2 - Quick connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a quick connector for piping for connecting a hose or a pipe for transferring fluid such as gasoline, oil, water and air.

[Prior Art] As a quick connector, as shown in FIGS. 6 and 7, a receiving hole 101 and a stopper holding port 10 opened in a wall portion 10
A fitting tubular portion having a first member 100 having a receiving tubular portion 103 having 2 and 105 (two pairs each) and a ring-shaped projection portion 202 extending in a ring shape on the outer peripheral surface and having a tapered surface 201. The second member 200 having 203 and U so that both ends face each other in the central portion.
It is known that the stopper member 300 is bent in a V shape (Japanese Patent Laid-Open No. 58-225290).

When using the above-mentioned quick connector, both end portions 301 of the stopper member 300 are inserted into the stopper holding ports 102 and 105 to be held by the first member 100, and in that state, the second member 2
By inserting the fitting tubular portion 203 of 00 into the receiving hole 101, both end portions 3 of the stopper member 300 can be formed by the tapered surface 201 of the ring-shaped protrusion 202.
01 is expanded by elastic deformation, and further, elastically recovered both ends 301 of the stopper member 300 and the locking surface 204 of the ring-shaped protrusion 202.
And the first member 100 and the second member 200 are connected.

Further, Japanese Patent Application Laid-Open No. 58-225290 also discloses a stopper member 300 having both end portions 301 provided with taper portions 304 that widen from one end toward the other end, as shown in FIG. Has been done.

[Problems to be Solved by the Invention] In the conventional quick connector described above, the first member is used.
Both ends 3 of stopper member 300 from stopper holding port 102 of 100
I'm going to insert 01. Therefore, in the state where the first member 100 and the second member 200 are connected as shown in FIG. 7, the central portion 302 of the stopper member 300 projects outward from the stopper holding port 102, and both end portions 301 of the stopper member 300. Tip 301a
Project outward from the stopper holding port 105. Therefore, during use, the central portion 302 of the stopper member 300 and the tips 301a of the both end portions 301 may interfere with or collide with other members, and the stopper member 300 may come off.

Therefore, the conventional quick connector described above does not always satisfy the reliability of the piping.

The present invention has been made in view of such circumstances, and an object thereof is to improve the problem of the stopper member coming off and to provide a reliable quick connector for piping.

[Means for Solving the Problems] A quick connector according to the present invention comprises a tubular first member having a receiving opening and a receiving tubular portion having a ring-shaped recess adjacent to the receiving opening and having a larger inner diameter than the receiving opening. A tubular second member having a ring-shaped projection protruding in the centrifugal direction and extending in a ring shape on the outer peripheral portion on one end side, and having a fitting tubular portion to be inserted into the receiving tubular portion through the receiving opening of the first member; A stopper member that connects the first member and a second member that has a fitting tubular portion that is held in the ring-shaped recess of the receiving tubular portion of the first member and that has a fitting tubular portion that is inserted into the receiving tubular portion. Is arranged so as to face the inner wall surface that defines the ring-shaped recess of the receiving cylinder portion of the first member, and one axial end contacts the inner end surface that defines the receiving opening of the receiving cylinder portion. The side end has an inner diameter larger than the inner diameter of the receiving opening, and the other end in the axial direction is the second member. The other end has an inner diameter smaller than the outer diameter of the ring-shaped protrusion of the second member so as to come into contact with the ring-shaped protrusion, and the taper is gradually reduced coaxially from one end to the other end. A C-ring body having a substantially C-shaped cross-section having a tapered wall, and a C-ring body protruding outward from respective C-shaped free ends of the C-ring body facing each other in a cross section along a direction perpendicular to the axis of the stopper member. Two end engaging projections that extend from one end to the other end and that narrow the gap between the C ring body and the inner wall surface that defines the ring-shaped recess of the receiving cylinder of the first member, and In the cross section along the direction, the C-ring body projects outward from the central region of the C-shaped circumferential lengths facing each other, extends from one end to the other end of the C-ring body, and is the receiving tube of the first member. Wall surface that defines the ring-shaped recess of the part and C
It is characterized by comprising a central engaging projection for narrowing the gap with the ring body.

The stopper member is in the shape of an elastic thin plate spring having a C-shaped cross section so that both ends face each other, and is made of resin, spring steel, or the like. As the resin, nylon resin, nylon resin containing glass fiber or the like can be adopted. The stopper member has a tapered wall. One end of the tapered wall has an inner diameter larger than that of the receiving opening of the receiving portion, and the other end has an inner diameter smaller than that of the ring-shaped projection of the second member.

It is also possible to provide the stopper member with an engaging protrusion that prevents the stopper member from falling inward in the axial direction from the receiving tube portion.

[Operation] The operation of the quick connector of the present invention will be described together with its usage. First, with the stopper member housed in the receiving tube portion of the first tube portion, the fitting tube portion of the second member is inserted into the receiving tube portion from the receiving opening of the first member. Then, the ring-shaped protrusion of the second member is pressed against the inner surface of the tapered wall of the stopper member, and the diameter of the stopper member increases. As the diameter increases, the ring-shaped protrusion gets over the stopper member. When it gets over, the stopper member restores its original diameter by its own elastic force, and the first member and the second member are connected.

In the state in which the first member and the second member are connected in this way, the tapered wall of the stopper member has one side end thereof locked to the inner end surface that defines the receiving opening of the receiving tube portion of the first member. Also, the other end is locked to the ring-shaped protrusion of the second member. The C-ring body of the stopper member is provided with two end engaging protrusions. Therefore, the end engagement protrusion narrows the gap between the inner wall surface that defines the ring-shaped recess of the receiving cylinder portion of the first member and the C ring body. Similarly, the C-ring body of the stopper member is provided with a central engaging projection. Therefore, the central engagement projection narrows the gap between the inner wall surface that defines the ring-shaped recess of the receiving cylinder portion of the first member and the C ring body.

As a result, in the state before connecting the first member and the second member, the stopper member is likely to be concentrically held in the ring-shaped recess of the receiving cylinder portion of the first member.

[Embodiment] An embodiment of the quick connector of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a partially cut side view of the quick connector of this embodiment.

The quick connector of this embodiment includes a first member 1, a second member 2 and a stopper member 3.

The first member 1 is made of metal and has a circular receiving opening 10 formed at the tip and a receiving tube portion 11 having a ring-shaped recess 11c adjacent to the receiving opening 10 and having a larger inner diameter than the receiving opening 10. Hold. The receiving opening 10 is formed with notches 10e and 10f that are open inside. The first member 1 is connected to the pipe 13.

The second member 2 is made of metal and has a fitting tubular portion 20 at the tip. A ring-shaped protrusion 21 is formed in a ring shape on the outer peripheral surface of the fitting tubular portion 20 so as to protrude in the centrifugal direction.

The stopper member 3 is shown in FIGS. The stopper member 3 is a ring-shaped recess of the receiving cylinder portion 11 of the first member 1.
It is placed facing the inner wall surface that divides 11c. The stopper member 3 is provided with a C ring body 32 having a substantially C-shaped cross section, which is provided with a tapered wall 30 made of a thin leaf spring made of nylon resin. As can be understood from FIG. 1, the one axial end 30a of the C ring body 32 abuts on the inner end surface 10c that defines the receiving opening 10 of the receiving tube portion 11. The other end 30b in the axial direction of the C ring body 32
Contacts the ring-shaped protrusion 21 of the second member 2. Further, as can be understood from FIG. 3, two engaging projections 3a and 3b as end engaging projections are provided so as to project outward from the C-shaped ends of the C ring body 32 facing each other. Has been done. As can be seen from FIG. 2, the engagement protrusions 3a and 3b extend in the axial direction from one end 30a of the C ring body 32 to the other end 30b thereof. Similarly, as can be understood from FIG. 3, an engaging projection 3e as a central engaging projection is formed so as to project outward from the C-shaped central region of the C ring body 32. As can be seen from FIG. 2, the engagement protrusion 3e extends in the axial direction from one end 30a of the C ring body 32 to the other end 30b thereof. The inner peripheral diameter of the one end 30a of the tapered wall 30 is indicated by D1, and the inner peripheral diameter of the other end 30b is indicated by D2 (D1> D2). Here, as shown in FIG. 1, the inner peripheral diameter D1 of the one end 30a of the tapered wall 30 of the stopper member 3 is
It is set to be larger than the inner peripheral diameter D4 of the receiving opening 10 of the first member 1. The inner peripheral diameter D2 of the other end 30b of the tapered wall 30 is set to be smaller than the outer peripheral diameter D5 of the ring-shaped protrusion 21 of the second member 2. An engagement protrusion 3e is formed at a substantially central portion of the stopper member 3 in the circumferential direction.

Next, the first member 1 and the second member of the quick connector of the present embodiment.
A case of connecting the member 2 will be described. First, the diameter of the stopper member 3 is reduced to bring the engaging protrusions 3a and 3b closer to each other. Then, the engaging protrusions 3a and 3b are passed through the notches 10e and the engaging protrusions 3e are passed through the notches 10f, so that the engaging protrusions 3e are inserted into the receiving cylinder portion 11 of the first member 1. When inserted, the stopper member 3 is restored to its original diameter in the receiving tube portion 11 by its own elastic force, and the stopper member 3 is provided substantially coaxially inside the ring-shaped recess 11c of the receiving tube portion 11. In this state, the fitting tubular portion 20 of the second member 2 is moved to the first
The member 1 is inserted into the receiving tube portion 12 in the direction of arrow X2 from the receiving opening 10. Then, as shown in FIG. 5, the ring-shaped protrusion 21 contacts the inner surface 30c of the tapered wall 30 of the stopper member 3, and the stopper member 3 is expanded and expanded in the direction of the arrow Y1 by the ring-shaped protrusion 21. As the diameter increases, the ring-shaped protrusion 21 of the fitting cylinder 20
Can pass through the stopper member 3 and enter the first member 1.

Then, as shown in FIG. 1, when the ring-shaped protrusion 21 passes over the other end 30b of the stopper member 3, the stopper member 3 elastically recovers by its own elastic force and returns to the original diameter. As a result, as shown in FIG. 1, the tapered wall 30 of the stopper member 3 is locked at its one end 30a at the inner end surface 10c defining the receiving opening 10, and at the other end 30b of the tapered wall 30 at the first end. It is locked to the ring-shaped protrusion 21 of the two member 2. Here, the one end 30a of the tapered wall 30 of the stopper member 3 and the inner end surface 10c of the first member 1 are arcuately contacted with each other to secure a locking area. Further, the other end 30b of the tapered wall 30 of the stopper member 3 also comes into contact with the ring-shaped protrusion 21 in an arc shape to secure a locking area.

As shown in FIG. 1, a ring-shaped seal member 60 and ring-shaped collars 61 and 62 are provided between the first member 1 and the second member 2.
Are arranged.

By the way, when removing the first member 1 and the second member 2,
Using the tubular release tool 5 shown in FIG.
With the second member 2 fitted, the release tool 5 is moved in the axial direction of the second member 2 to move the release tool 5 to the stopper member 3.
It is pressed against the inner surface 30c of the taper wall 30 to expand the diameter of the stopper member 3, and when the diameter of the stopper member 3 is increased, the second
The member 2 is separated from the first member 1.

As described above, in this embodiment, the receiving tube portion of the first member 1
If the fitting tubular portion 20 of the second member 2 is inserted into the receiving tubular portion 11 of the first member 1 with the stopper member 3 inserted into the stopper member 11, the stopper member 3 is elastically deformed and the diameter is expanded appropriately. First member 1
And the second member 2 can be connected easily and quickly.

Further, in this embodiment, since the stopper member 3 is housed in the ring-shaped recess 11c of the receiving cylinder portion 11 of the first member 1 and does not project outward, other members may interfere with or collide with the stopper member 3. Can be avoided. Therefore, it is possible to prevent the stopper member 3 from coming off due to the interference of other members and the collision.
The reliability of the connection between the first member and the second member 2 can be improved as compared with the conventional connector shown in FIGS.

Further, in this embodiment, the stopper member 3 is engaged with the engaging protrusions 3a, 3b,
Since 3e is formed, the engaging protrusion 3 of the stopper member 3
The a, 3b, and 3e are appropriately engaged with the inner peripheral surface of the ring-shaped recess 11c of the receiving cylinder portion 11, so that the stopper member 3 can be prevented from falling inside the receiving cylinder portion 11. As you can see from Figure 4,
The stopper member 3 is indicated by an arrow in the radial direction (direction perpendicular to the axis).
Movement in the X1 direction is effectively suppressed. Therefore, the position of the stopper member 3 can be maintained at a substantially fixed position. Therefore, when the second member 2 is inserted into the first member 1, the ring-shaped protrusion 21 surely hits the inner surface 30c of the tapered wall 30 of the stopper member 3, and the expandability of the stopper member 3 can be secured.

By the way, in the conventional quick connector shown in FIG. 6 and FIG. 7, the part at the one side end 302a of the central portion 302 of the stopper member 300 is locked in a point contact state or a state close to a point contact. The locking area is small. Similarly, the parts at the tips 301a of both ends 301 of the stopper member 300 are also locked in a point contact state or a state close to point contact. Therefore, if an unexpected external force acts in the direction of pulling out the second member 200, stress concentration is likely to occur at the point contact portion.

In this respect, in the present embodiment, when the first member 1 and the second member 2 are connected as described above, the engaging portion of the stopper member 3 is arcuate, and the engaging area of the stopper member 3 can be maximized. This makes it possible to increase the axial engaging force between the second member 2 and the first member 1 while avoiding the problem of stress concentration of the stopper member 3.

[Effect of the Invention] According to the quick connector of the present invention, the first member and the second member
When the stopper member is connected to the member, the stopper member is internally provided in the receiving tube portion of the first member, so that the stopper member can be prevented from interfering with or colliding with other members. Therefore, it is possible to avoid the stopper member from coming off due to interference with other members and collision,
The reliability of piping can be improved. Both the end engaging protrusion and the center engaging protrusion of the stopper member narrow the gap between the inner wall surface defining the ring-shaped recess of the receiving cylinder portion of the first member and the C ring body. As a result, in the state before connecting the first member and the second member, the stopper member is likely to be concentrically held in the ring-shaped recess of the receiving tube portion of the first member, and the stopper member is properly arranged in the radial direction. It becomes a position. That is, the stopper member is prevented from falling excessively in the ring-shaped recess in the radial direction. Similarly, excessive inclination of the stopper member in the ring-shaped recess is also suppressed. Therefore, when inserting the fitting tubular portion of the second member into the receiving tubular portion of the first member and connecting the two, the workability of inserting the fitting tubular portion of the second member into the first member is extremely good. Will be things.

[Brief description of drawings]

1 to 5 show one embodiment of the present invention. FIG. 1 is a side view showing an upper half of a state in which a first member is connected to a second member in section, and FIG. 2 is a stopper member. FIG. 5 is a plan view, FIG. 3 is a front view of the same, FIG. 4 is a side view showing a state in which the fitting tubular portion of the second member is inserted into the receiving tubular portion of the first member, and FIG. 5 is a stopper member. FIG. 3 is a cross-sectional view showing a main part of a state in which the diameter of is expanded. FIGS. 6 to 8 show a conventional technique, FIG. 6 is an exploded perspective view, FIG. 7 is a sectional view in a connected state, and FIG. 8 is a perspective view of another conventional stopper member. In the figure, 1 is a first member, 10 is a receiving opening, 11 is a receiving tube portion, 2 is a second member, 20 is a fitting tubular portion, 21 is a ring-shaped projection, 3 is a stopper member, 3a, 3b, 3e. Is an engaging protrusion, 30 is a tapered wall, 30a
Indicates one end and 30b indicates the other end.

Claims (1)

[Scope of utility model registration request] 1. A tubular first member having a receiving opening and a receiving tubular portion adjacent to the receiving opening and having a ring-shaped recess having a larger inner peripheral diameter than the receiving opening, and an outer peripheral portion on one end side in a centrifugal direction. A tubular second member having a ring-shaped projection that projects and extends in a ring shape, and has a fitting tubular portion that is inserted into the receiving tubular portion through the receiving opening of the first member; A stopper member that is held in the ring-shaped recess of the receiving cylinder portion and that connects the first member and the second member having the fitting cylindrical portion that is inserted into the receiving cylinder portion, and the stopper The member is arranged so as to face an inner wall surface that defines the ring-shaped recess of the receiving cylinder portion of the first member, and one axial end of the member contacts an inner end surface that defines a receiving opening of the receiving cylinder portion. Similarly, the one end has an inner diameter larger than the inner diameter of the receiving opening, and the other end in the axial direction has a ring-shaped protrusion of the second member. The other end has an inner peripheral diameter smaller than the outer peripheral diameter of the ring-shaped protrusion of the second member and has a taper that is coaxially and successively smaller from the one end to the other end so as to come into contact with the portion. A C-ring body having a substantially C-shaped cross section having a taper wall, and a C-ring body protruding outward from respective C-shaped free ends of the C-ring body facing each other in a cross section along a direction perpendicular to the axis of the stopper member. Two end engaging projections that extend from one end to the other end of the body and that narrow the gap between the inner wall surface that defines the ring-shaped recess of the receiving cylinder portion of the first member and the C ring body And in the cross section along the direction perpendicular to the axis, projecting outward from the central region of the C-shaped circumferential lengths of the C ring body facing each other, and from the one side end to the other side end of the C ring body. An inner wall surface that extends and defines the ring-shaped recess of the receiving cylinder portion of the first member Quick connector characterized by comprising a central engagement projection for narrowing the gap between the C-ring member.