JPH11218283A - Quick connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the mounting/demounting of an 'O' ring sealing a space between a socket and a plug, prevent a packing from being damaged, and prevent sealing capability from being degraded. SOLUTION: A socket 1 is formed out of a receiving part 11, an intermediate part 12 small in diameter, and of a packing stopper 14, and hard balls 3 are housed in a hard ball housing hole 16 provided for the receiving part 11 in such a way that they can be moved. A plug 2 is formed out of a first insertion part 21 capable of being inserted in the inner circumference of the intermediate part 12, and of a second insertion part 22 larger in diameter than the first insertion part, and capable of being inserted in the inner circumference of the receiving part, a back-up ring receiver 24 is formed in between, and a fitting recessed part 25 is formed in the side of the insertion part 22. The balls 3 are constrained to a state that they are fitted into the fitting recessed part 25 by means of a slider 4 in which the socket 1 and the plug 2 are freely moved in the axial direction, and the socket and the plug are mutually connected with each other. An 'O' ring 7 to be press fitted to the inner circumferential surface of the receiving part 11 and the outer circumferential surface of the insertion part 21, and a back-up ring 8 to be mounted with a press fit to the inner circumferential surface of the receiving part 11, and to be mounted with a loose fit to the outer circumferential surface of the insertion part 21, are mounted to a space between the packing stopper 14 and the back-up ring receiver 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, pneumatic devices,
The present invention relates to a quick connector used for connecting piping or a flow path of a hydraulic device or a hydraulic device.

[0002]

2. Description of the Related Art As a typical conventional example of this type of connector, as shown in FIG. 6, a socket 100 attached to an end of one pipe or flow path and an end of the other pipe or flow path are provided. A plug 110 attached to the socket and insertable into the socket 100; and a coil spring 13 disposed on the outer periphery of the socket 100 so as to be axially movable.
0, the tip 1 of the plug receiving portion 101 of the socket 100
01a side, and the socket 100 and the plug 110 inserted in the inner periphery of the socket 100,
There is a structure that is connected to each other through a plurality of hard balls 140.

The hard balls 140 are formed in a plurality of tapered hard ball receiving holes 10 formed in the socket 100 at predetermined intervals in the circumferential direction.
2 and a part of the spherical surface protrudes from the hard ball receiving hole 102 toward the inner peripheral side of the socket 100 and is formed continuously on the outer peripheral surface of the insertion tube 111 of the plug 110 in the circumferential direction. The fitting groove 112 can be fitted. The slider 120 has a large-diameter inner peripheral surface 121 that forms a clearance space for the hard sphere 140 outside the hard sphere receiving hole 102 when the coil spring 130 is displaced in a compression direction (the side opposite to the tip 101 a of the plug receiving portion 101). And a stop ring 150 in a biasing direction by the coil spring 130.
And a small-diameter inner peripheral surface 122 that restricts the hard sphere 140 in a fitting state with the fitting groove 112 by being displaced to a movement restriction position due to interference with the fitting groove 112. In addition, socket 10
A packing 160 such as an O-ring or a square ring and a backup ring 170 are mounted in a groove 103 formed continuously in the circumferential direction on the inner peripheral surface of the plug receiving portion 101 of the plug receiving portion 101. The space between the plug 110 and the insertion tube 111 of the plug 110 inserted into the inner periphery is sealed.

That is, in order for the connector to have the connection state shown in FIG. 6, the slider 120 is first displaced in the compression direction of the coil spring 130, and then the socket 100 is displaced.
Is inserted into the inner circumference of the plug 110. In this way, as shown in FIG.
Since the hard sphere 140 in each hard sphere accommodating hole 102 is pushed toward the large-diameter inner peripheral surface 121 side of the slider 120 during the insertion process of 1, the insertion of the insertion tube portion 111 is allowed. When the insertion tube 111 is inserted to a predetermined depth, the fitting groove 112 reaches a position corresponding to the hard ball housing hole 102 in the radial direction, so that the slider 120 is brought into contact with the stop ring 150 by the urging force of the coil spring 130. Is displaced to the interference position, the hard sphere 140 in each hard sphere receiving hole 102 is pushed inward by the small-diameter inner peripheral surface 122 of the slider 120, and a part of the spherical surface is fitted into the fitting groove 112. Then, the socket 100 and the plug 110 are held in a mutually connected state.

Conversely, the socket 100 and the plug 110
When the slider 120 is displaced in the compression direction of the coil spring 130 to release the restrained state of the hard sphere 140, the socket 1 can be separated from the connected state shown in FIG.
00, the plug 110 can be easily pulled out.

[0006]

According to the above prior art, the groove 103 for mounting the packing 160 and the backup ring 170 is formed by cutting, but the insertion and removal of the socket 100 and the plug 110 are repeated many times. In order to make the packing 160 and the backup ring 170 less likely to be damaged due to twisting and galling, the groove 103 needs to be finished in a perfect cross-sectional shape and with high precision, and processing is difficult. In addition, it is necessary to increase the thickness of the socket 100 in consideration of the depth of the groove 103, and there is a problem that the material cost increases accordingly.

The outer diameters of the packing 160 and the backup ring 170 are different from those of the plug receiving portion 10 of the socket 100.
1 has a larger diameter than the inner peripheral surface, so that there is a problem that it is difficult to insert the plug into the inner periphery of the plug receiving portion 101 when mounting in the groove 103. Moreover, in this mounting process, the plug receiving portion 1
01 may be twisted due to frictional resistance with the inner peripheral surface, and in such a case, required sealing properties cannot be obtained.
It is pointed out that there is a risk that the fluid flowing inside the connector leaks to the outside.

Further, in the case where the packing 160 is taken out from the groove 103 and inspected, it is difficult to take out the gasket 160.
Since the gasket must be pulled out from the gasket 03, the packing 160 may be damaged in the process of being taken out, and may not be reused.

SUMMARY OF THE INVENTION The present invention has been made under the circumstances described above, and its main technical problem is that a packing for sealing between a socket and a plug can be easily mounted and removed. In addition, it is an object of the present invention to provide a quick connector having a structure in which packing is prevented from being damaged and sealing performance is not reduced.

[0010]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the quick connector according to the present invention includes a socket in which a plurality of hard-ball receiving holes penetrating in the radial direction are opened at predetermined intervals in the circumferential direction, and a quick-moving housing in the hard-ball receiving hole so as to be movable in the radial direction of the socket. A plug having a fitting recess that can be inserted into the inner periphery of the socket from one side in the axial direction and that can be fitted to a part of the spherical surface of the hard ball when inserted to a predetermined insertion depth, A slider that is axially movably disposed on the outer periphery of the socket and restrains or releases the hard ball in a fitting state with the fitting recess, and in a state in which the slider is in close contact with the inner peripheral surface of the socket with a predetermined interference. A backup ring that is fitted and clearance-fitted to the outer peripheral surface of the plug via a predetermined gap, and between a packing stop formed stepwise on the inner peripheral surface of the socket and the backup ring. It is arranged and a packing that is closely in a predetermined squeeze the outer peripheral surface of the inner peripheral surface and the plug of the socket. In this quick connector, when connecting the socket and the plug, the plug is inserted into the inner periphery of the socket to a predetermined depth with the slider displaced to the unconstrained position for the hard ball, and the slider is axially moved to the constrained position for the hard ball. Then, the socket and the plug are connected to each other via the hard sphere by constraining the hard sphere so that a part of the spherical surface is fitted in the fitting recess of the plug.

According to the present invention, the packing is held on the inner peripheral surface of the socket in a state where the packing is prevented from being removed from the packing of the socket by the backup ring fitted to the inner peripheral surface of the socket. There is no need to provide a groove for packing in the inner peripheral surface of the socket. The backup ring is fitted on the inner peripheral surface of the socket with a predetermined interference. However, the backup ring is in a clearance-fitted state with a predetermined gap on the outer peripheral surface of the plug. In the process of pulling out the plug, the backup ring does not attach to the outer peripheral surface of the plug and does not come off from the inner peripheral surface of the socket, and the packing closely contacted with the outer peripheral surface of the plug is pulled out from the inner peripheral surface of the socket together with this plug. To prevent

In the case of the conventional structure in which the packing and the backup ring are mounted in a groove formed in the inner peripheral surface of the socket, the outer diameter of the packing and the backup ring is adjusted to the groove depth from the inner peripheral surface. Is also formed with a large diameter, a large frictional resistance with the inner peripheral surface of the socket occurs during the mounting process, but according to the configuration of the present invention, the fitting force of the backup ring to the inner peripheral surface of the socket is:
As long as the backup ring does not slide down easily, a large frictional resistance does not occur during the mounting process, so that the mounting operation is easy and the generation of twist is effectively prevented. Also, when removing the packing from the inner periphery of the socket, the backup ring can be easily removed by pulling it out with an appropriate jig. There is no damage to the packing.

As a further preferred configuration added in the present invention, a backup ring receiver for restricting the movement of the backup ring to one side in the axial direction of the socket when the plug is connected to the socket is formed on the outer peripheral surface of the plug. Is done. According to this configuration, in the pipe connection state, the pressure of the fluid flowing through the inner periphery of the connector acts to push the packing toward one axial side of the socket (the plug insertion port side). Movement is regulated via the backup ring by the backup ring receiver of the plug connected to the socket by a hard ball. Further, the backup ring is pressed against the backup ring receiver by the pressure acting on the packing, so that the backup ring also functions as a dust seal that prevents foreign substances from entering from outside.

In another preferred embodiment added in the present invention, the socket, plug and slider are formed by plastic working of a metal material. Therefore, as described above, the shape of the inner peripheral surface of the receiving portion of the socket is not required to be processed with a groove for mounting the packing, so that the shape is simplified, and the socket can be easily manufactured at a low processing cost. it can. Note that, as the “plastic working” here, drawing by roll forging, deep drawing of a sheet material, or the like is typically employed.

[0015]

FIG. 1 is an exploded perspective view showing a preferred embodiment of a quick connector according to the present invention, and FIGS. 2 to 4 are sectional views showing the operation of a connecting or disconnecting process in this embodiment. 5 is an enlarged sectional view of a main part in a connected state. In this quick connector, reference numeral 1 denotes a socket attached to an end (not shown) of one pipe or flow path, and 2 denotes a connection end of the other pipe or flow path (shown in FIG. 3 is a plurality of hard balls connecting the socket and the plug 2 inserted in the inner periphery thereof, 4 is a slider arranged on the outer periphery of the socket 1 so as to be movable in the axial direction. Is a spring ring for holding the slider 4 in a restrained position with respect to the hard ball 3, 6 is a stop ring for preventing the slider 4 from coming off, and 7 is the socket 1
An O-ring 8 as a packing for sealing between the O-ring 7 and the plug 2 is a backup ring mounted on the inner peripheral surface of the socket 1 adjacent to the O-ring 7.

The socket 1 includes a receiving portion 11, an intermediate portion 12 having a diameter smaller than that of the receiving portion 11, and
Connection portions 13 having a diameter smaller than 2 are formed sequentially from one side in the axial direction. A packing stopper 14 is formed between the receiving part 11 and the intermediate part 12 so as to be continuous in the circumferential direction, and a plug stopper 15 is formed between the intermediate part 12 and the connecting part 13 in the circumferential direction. It is formed in a continuous step shape.
A plurality of hard ball receiving holes 16 penetrating in the radial direction are opened at equal intervals in the circumferential direction at a position eccentrically located on the side of the plug insertion opening 11 a at the tip of the receiving portion 11. 16 is accommodated in the socket 1 so as to be movable in the radial direction of the socket 1. Further, on the outer peripheral surface of the receiving portion 11, a fitting groove 17 which is located near the annular step portion 14 and is continuous in the circumferential direction, and a position between the fitting groove 17 and the hard ball receiving hole 16. The stop ring 6 is fitted in the fitting groove 17 in the circumferential direction.

That is, the receiving portion 11, the packing stopper 14, the intermediate portion 12, the plug stopper 15, and the connecting portion 13 are formed by subjecting the socket 1 to, for example, drawing by a roll forging of a metal tube or deep drawing of a metal plate. Stepped formation,
It can be easily manufactured by forming the hard ball housing hole 16 and forming the fitting groove 17 and the locking groove 18 from the outer peripheral side. In addition, because it does not require precise groove processing for packing on the inner peripheral surface, the wall thickness is thinner than before,
The shape can be simple.

As shown in FIG. 2, the diameter of the inner end 16a of the hard ball receiving hole 16 opened to the inner peripheral side of the receiving portion 11 of the socket 1 is smaller than the diameter of the outer end 16b opened to the outer peripheral side. The diameter of the hard sphere 3 is smaller than the diameter of the outer end 16 b of the hard sphere housing hole 16, and is larger than the diameter of the inner end 16 a and the thickness of the receiving portion 11 in the radial direction. For this reason, the hard sphere 3 cannot pass through the hard sphere housing hole 16 to the inner circumference of the receiving portion 11, but moves toward the inner circumference to a position where a part of the spherical surface projects to the inner circumference of the receiving portion 11. You can move.

The plug 2 is also formed by subjecting a metal tube to drawing by roll forging, deep drawing of a metal plate, or the like, and can be inserted into the inner periphery of the intermediate portion 12 of the socket 1 with a small gap. A first insertion portion 21; a second insertion portion 22 which is formed to have a diameter larger than the first insertion portion 21 and which can be inserted into the inner periphery of the receiving portion 11 of the socket 1 with a small gap; Connection portion 23 having the same diameter as portion 22
Are sequentially formed toward one side in the axial direction. In addition, a backup ring receiver 24 is formed between the first insertion portion 21 and the second insertion portion 22 in a step shape continuous in the circumferential direction, and is provided between the second insertion portion 22 and the connection portion 23. In the figure, a fitting concave portion 25 narrowed in a curved shape toward the inner peripheral side is formed continuously in the circumferential direction.

As shown in FIG. 4, the fitting recess 2 of the plug 2
5, the plug 1 is inserted into the socket 1 until the distal end 21a of the first insertion portion 21 substantially interferes with the inner surface of the plug stopper 15.
Is formed at a position radially corresponding to the hard ball receiving hole 16 of the socket 1 when inserted into the socket 1. Therefore, each hard sphere 3 accommodated in the hard sphere accommodation hole 16 is connected to the plug 2
Is inserted into the socket 1 to the above-mentioned depth, a part of the spherical surface protrudes from the inner end 16a of each of the hard-ball receiving holes 16 and can fit into the fitting concave portion 25. Also, plug 2
The length of the first insertion portion 21 in the axial direction is such that when the plug 2 is inserted to the above-described depth, the backup ring receiver 24 is in a predetermined space S with the packing stopper 14 of the socket 1.
Are set to face each other in the axial direction.

The slider 4 has an axial length shorter than the receiving portion 11 of the socket 1 and has a large-diameter portion 41 facing the plug insertion port 11a side and an inner peripheral surface slightly smaller than the outer peripheral surface of the receiving portion 11. A small-diameter portion 42 opposed with a gap, and a tapered step portion 43 formed between the large-diameter portion 41 and the small-diameter portion 42.
And a spring ring receiving portion 44 formed at an end opposite to the large diameter portion 41. The inner peripheral surface of the large diameter portion 41 forms a hard ball escape space slightly larger than the difference between the length of the hard ball housing hole 16 in the radial direction of the socket 1 and the diameter of the hard ball 3 outside the hard ball housing hole 16. The receiving portion 11 is formed to have a larger diameter than the outer peripheral surface of the receiving portion 11.

The spring ring receiving portion 44 of the slider 4
A circumferentially continuous holding groove 44 for accommodating and holding the spring ring 5 in a state in which the spring ring 5 can be elastically expanded and deformed.
a retaining hole 44b and an operation hole 44c are formed from the holding groove 44a so as to penetrate the peripheral wall of the spring ring housing portion 44 in the radial direction. As shown in FIG. 1, the spring ring 5 is substantially C-shaped in the circumferential direction.
A main body portion 51 extending in the shape of a letter and having an appropriate interference with respect to the outer peripheral surface of the receiving portion 11 of the socket 1, and a hooking end portion 52 extending to the outer peripheral side from both opposing opposite ends thereof. Normally, the main body portion 51 is in a state where its outer peripheral portion is engaged with the holding groove 44a as shown in FIG. 2 and FIG. Also,
The engaging end 52 is engaged by being inserted into the engaging hole 44b, and the operating end 53 is connected to the operating hole 44c.
The spring hole accommodating portion 44 is inserted so as to be movable in the circumferential direction, and is normally unevenly distributed in the operation hole 44c toward the hook hole 44b.

The slider 4 is formed, for example, by a drawing process by roll forging of a metal tube or a deep drawing process of a metal plate, so that a large-diameter portion 41, a tapered step portion 43, a small-diameter portion 42, and a spring ring receiving portion are formed. 44 is formed, and the hole 44b and the operation hole 44c are formed from the outer peripheral side of the spring ring accommodating portion 44 by drilling. The holding groove 44a is formed at the same time when the spring ring accommodating portion 44 is bent into a substantially U-shape that is convex toward the outer peripheral side, so that groove processing from the inner periphery is not required, and therefore, it can be easily manufactured. .

As shown in FIGS. 2 and 3, the slider 4
Is moved to a position where the inner peripheral edge of the outer end of the spring ring housing 44 interferes with the stop ring 6 so that the spring ring is held in the holding groove 44 a of the spring ring housing 44. 5 is in a state of being elastically fitted at a position between the stop ring 6 and the locking groove 18 on the outer peripheral surface of the receiving portion 11 of the socket 1, and the large-diameter portion 41 of the slider 4 It is located so as to surround the hard ball receiving hole 16 in the part 11 from the outside. In this state, the hard sphere 3 in each hard sphere housing hole 16 can move toward the outer periphery of the slider 4 to a position where it does not protrude from the inner end 16 a of the hard sphere housing hole 16.

When the slider 4 is moved from the position shown in FIGS. 2 and 3 toward the plug insertion opening 11a of the socket 1, the spring ring 5 held in the holding groove 44a of the spring ring receiving portion 44 receives the spring ring 5. The outer peripheral surface of the portion 11 slides in the axial direction, and when it reaches the outer periphery of the locking groove 18, its diameter is reduced by its own elasticity. Thereby, the slider 4 is locked at the restraining position with respect to the hard ball 3. In this state, the hard ball 3 is moved by the small-diameter portion 42 of the slider 4 into the hard ball housing hole 16.
Is pressed from outside, and a part of the spherical surface is
6 is constrained to protrude from the inner end 16a.

When the engagement of the spring ring 5 with the locking groove 18 is released, the operation end 53 of the spring ring 5 protruding from the operation hole 44c of the spring ring accommodating portion 44 of the slider 4 is hooked with a finger. By displacing the main body portion 51 of the spring ring 5 from the locking groove 18 by displacing the main body portion 51 from the locking end portion 52, the main body portion 51 of the spring ring 5 is elastically lifted from the locking groove 18. The slider 4 is axially moved toward the stop ring 6 while expanding and deforming the diameter. As a result, the main body portion 51 of the spring ring 5 rides on the outer peripheral surface of the receiving portion 11 of the socket 1 and the operation end portion 5
The slider 4 can be moved toward the stop ring 6 even if the finger is removed from the finger 3.

The O-ring 7 and the backup ring 8
As shown in FIG. 4, when the plug 2 is inserted into the socket 1 to a depth at which the tip 21 a of the first insertion portion 21 substantially interferes with the inner surface of the plug stopper 15 in the socket 1, It is arranged on the inner peripheral surface of the receiving portion 11 of the socket 1 so as to be located between the plug 2 and the backup ring receiver 24. And
The O-ring 7 is disposed on the packing stopper 14 side, and the backup ring 8 is disposed on the backup ring receiver 24 side.

When the first insertion portion 21 of the plug 2 is inserted into the inner periphery of the O-ring 7, the outer circumference of the first insertion portion 21 and the inner periphery of the receiving portion 11 of the socket 1 have a diameter. The first insertion portion 21 and the inner peripheral surface of the receiving portion 11 are appropriately compressed to allow close contact with each other in an appropriately compressed direction. On the other hand, the outer peripheral surface of the backup ring 8 has the receiving portion 11.
Is fitted with an appropriate interference on the inner peripheral surface of
As shown in FIG. 5, the inner peripheral surface has a slightly larger diameter than the outer peripheral surface of the first insertion portion 21, and has a gap G ₁ having a size such that the O-ring 7 does not protrude and is bitten. Through which a gap is fitted.

When mounting the O-ring 7, first,
The ring 7 is inserted into the inner periphery of the plug insertion opening 11a of the socket 1 and then the backup ring 8 is inserted in the same manner. Insert until it touches. By doing so, the O-ring 7 is pressed together with the backup ring 8 by the backup ring receiver 24 of the plug 2 and is pushed to the mounting position shown in FIG. Since the fitting force of the backup ring 8 to the inner peripheral surface of the receiving portion 11 of the socket 1 only needs to be such that it does not easily slide down even if the plug insertion port 11a is directed downward, a large frictional resistance is generated in the above mounting process. Therefore, the mounting operation is easy, and the O-ring 7 is not twisted. When taking out the O-ring 7 from the inner periphery of the receiving portion 11, the backup ring 8 may be pulled out with a suitable jig.

The connection operation and the connection release operation of the quick connector having the above configuration will be described below.

When connecting the sockets 1 and 2 to each other after the socket 1 and the plug 2 are separated from each other, first, FIG.
As shown in the figure, the slider 4 is moved to a position where the slider 4 interferes with the stop ring 6, that is, a position where the slider 4 is not restrained with respect to the hard ball 3,
After the hard ball 3 in each hard ball housing hole 16 is movable, the plug 2 is inserted into the inner periphery of the socket 1 from the plug insertion port 11a side. In the process of inserting the plug 2, as shown in FIG. 3, first, the first insertion portion 21 of the plug 2 passes through the inner circumference of the backup ring 8 and is press-fitted into the inner circumference of the O-ring 7, so that the O The ring 7 is pushed out to the outer peripheral side, and closely contacts the outer peripheral surface of the first insertion portion 21 and the inner peripheral surface of the receiving portion 11 with an appropriate crushing allowance. Further, the following movement of the O-ring 7 accompanying the insertion of the first insertion portion 21 is as follows.
It is regulated by the packing stopper 14 of the socket 1.

When the second insertion portion 22 of the plug 2 is inserted into the inner periphery of the receiving portion 11 of the socket 1, in the process, a part of the spherical surface protrudes from the inner periphery of the receiving portion 11. 3 interferes with the backup ring receiver 24 which is an outer peripheral step surface of the plug 2, but the slider 4 is in a non-constrained position with respect to the hard ball 3, and the hard ball 3 can move in the hard ball housing hole 16, so that the outer diameter It is pushed to the side and does not hinder the insertion of the second insertion portion 22. At this time, the slider 4
Is held at the unconstrained position by the tightening force of the spring ring 6 against the outer peripheral surface of the receiving portion 11 of the socket 1, so that the slider 4 can be held as in the conventional example shown in FIGS.
Can be easily performed as compared with the case where the plug 2 is inserted while holding the plug 2 in the unrestrained position against the urging force of the coil spring with one hand.

As shown in FIG. 4, the front end 21a of the first insertion portion 21 of the plug 2 is
When the plug 2 is inserted to a depth where the insertion is restricted by contact with the plug 2, the fitting recess 25 of the plug 2
And reach the position corresponding to the radial direction. So slider 4
Is moved toward the plug insertion opening 11a side of the socket 1 and, in the process, the hard sphere 3 in each hard sphere accommodating hole 16 is pushed into the inner diameter side by the advance of the tapered step portion 43 and the small diameter portion 42 of the slider 4. A part of the spherical surface protrudes from the inner end 16a of the hard ball housing hole 16 and fits into the fitting recess 25.

As the slider 4 is moved toward the plug insertion opening 11a of the socket 1 as described above, the spring ring 5 held in the spring ring receiving portion 44 is moved to the outer peripheral surface of the receiving portion 11. To fit into the locking groove 18. As a result, the slider 4 is locked in the restrained position with respect to the hard ball 3, that is, the small-diameter portion 4
2 is locked so as to be located outside the hard ball receiving hole 16, so that the hard sphere 3 in each hard ball receiving hole 16 has a part of the spherical surface thereof fitted with the fitting recess 25 of the first insertion portion 21 of the plug 2. It is restrained in the fitted state. Therefore, the plug 2 is connected to the socket 1 via the hard ball 3.

As shown in FIG. 5, the pressure P of the fluid flowing through the inner circumference of the
Are the middle part 12 of the socket 1 and the first insertion part 2 of the plug 2
Through the gap G ₂ between the 1 acts in the space between the packing stopper 14 and the O-ring 7 of the socket 1. For this reason,
The socket 1 and the plug 2 are applied with a force in the direction of coming out in the axial direction due to the pressure P. The spring ring 5 which locks the slider 4 at the restraining position with respect to the hard ball 3 by engagement with the locking groove 18. Does not come off from the locking groove 18 unless the diameter is expanded by an external force,
The connection state by the hard ball 3 is maintained, and it is possible to reliably prevent the plug 2 from accidentally falling out of the socket 1. The movement of the O-ring 7 due to the pressure P is as follows.
The backup ring 8, which is regulated by the backup ring receiver 24 of the plug 2 via the backup ring 8, and thereby is in close contact with the backup ring receiver 24, is connected between the receiving portion 11 of the socket 1 and the second insertion portion 22 of the plug 2. since the foreign matter through the gap G ₃ between functions as a dust seal to prevent the intrusion from the outside, the foreign matter on the sealing surface of the O-ring 7 can be prevented to intervene.

In order to separate the socket 1 and the plug 2 from the connected state shown in FIG. 4, first, the operating end 53 of the spring ring 5 in the operating hole 44c of the spring ring receiving portion 44 of the slider 4 is manually moved in FIG. In the direction of arrow A. Thereby, the main body part 5 of the spring ring 5
Since the diameter of 1 increases, the engagement with the locking groove 18 is released, and the slider 4 can be moved toward the stop ring 6 side.

When the slider 4 is moved until it interferes with the stop ring 6, when the finger is released from the operation end 53, the body portion 51 of the spring ring 5 is resiliently attached to the outer peripheral surface of the receiving portion 11 of the socket 1. Mounting,
The slider 4 is locked at the non-restrained position with respect to the hard ball 3 by the fitting force, and the hard ball 3 restrained in the fitted state with the fitting recess 25 is released from the restraint. For this reason, when the plug 2 is pulled out from the socket 1, as shown in FIG. 3, the fitting concave portion 25 moves the inner circumference of the receiving portion 11 of the socket 1 from the position on the inner circumference side of the hard ball receiving hole 16 in the pulling direction. Accordingly, the hard sphere 3 is pushed to the outer peripheral side so as to ride on the outer peripheral surface of the first insertion portion 21 of the plug 2, and the plug 2 is smoothly pulled out.

In the process of pulling out the plug 2, the O-ring 7, which is in close contact with the outer peripheral surface of the first insertion portion 21 of the plug 2, inserts the plug of the socket 1 by frictional force with the first insertion portion 21. An attempt is made to follow the mouth 11a, but such movement is prevented by the backup ring 8.

Note that the present invention is not limited to the illustrated embodiment. For example, the O-ring 7 can be changed to another packing, such as a square ring having a rectangular cross section, and the shape of the details of each member can be variously changed.

[0040]

According to the quick connector of the present invention, it is not necessary to form a groove for packing in the inner peripheral surface of the receiving portion of the socket, and the socket, plug and slider are formed by plastic working of a metal material. As a result, the shape becomes thin and simple, so that it can be manufactured at low processing cost.

The packing and the backup ring can be mounted by first inserting the packing into the plug insertion opening of the socket, then inserting the backup ring in the same manner, and then pushing the plug into the predetermined mounting position with a plug. Can be attached to In addition, at this time, unlike the case where the packing and the backup ring are mounted in the groove formed in the inner circumference of the socket, a large frictional resistance does not occur in the process of inserting the packing and the backup ring into the inner circumference of the socket. And the occurrence of torsion is effectively prevented, and the sealing performance due to the torsion of the packing is effectively prevented.

Further, if the backup ring is pulled out from the inner periphery of the socket, the packing can be easily taken out, so that there is no danger of damage such as when the packing is hooked on a jig and pulled out from the groove.

Also, the pressure of the fluid flowing through the inner circumference of the connector causes the backup ring, which is in close contact with the backup ring receiver of the plug, to function as a dust seal. There is no danger that the sealing performance is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of a quick connector according to the present invention.

FIG. 2 is a sectional view showing a separated state of a socket and a plug in the embodiment.

FIG. 3 is a sectional view showing a process of inserting or pulling out a plug from a socket in the embodiment.

FIG. 4 is a cross-sectional view showing a connection state between a socket and a plug in the embodiment.

FIG. 5 is an enlarged sectional view of a main part showing a sealed portion of a socket and a plug in the embodiment.

FIG. 6 is a cross-sectional view showing a connection state between a socket and a plug of a connector according to the related art.

FIG. 7 is a cross-sectional view illustrating a connecting process or a separating process of the socket and the plug according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Socket 11 Receiving part 11a Plug insertion opening 12 Intermediate part 13 Connection part 14 Packing stop 15 Plug stop 16 Hard ball receiving hole 17 Fitting groove 18 Locking groove 2 Plug 21 First insertion part 22 Second insertion part 23 Connection part 24 Backup Ring receiver 25 Fitting concave part 3 Hard ball 4 Slider 41 Large diameter part 42 Small diameter part 43 Tapered step part 44 Spring ring receiving part 44a Holding groove 44b Hook hole 44c Operation hole 5 Spring ring 51 Main body part 52 Hook end part 53 Operation end 6 the stop ring 7 O-ring (gasket) 8 backup ring G ₁ ~G ₃ clearance

Claims (3)

[Claims] A plurality of hard ball receiving holes (1) penetrating in a radial direction.
6) Sockets (1) opened at predetermined intervals in the circumferential direction
A hard ball (3) housed in each of the hard ball housing holes (16) so as to be movable in the radial direction of the socket (1); And a plug (2) having a fitting concave portion (25) that can be fitted to a part of the spherical surface of the hard ball (3) when inserted to a predetermined insertion depth, and axially moved to the outer periphery of the socket (1). A slider (4) that is freely arranged and restrains or releases the hard ball (3) in a fitting state with the fitting recess (25); and a predetermined interference on the inner peripheral surface of the socket (1). A backup ring (8) fitted in close contact with the outer peripheral surface of the plug (2) through a predetermined gap (G ₁ ); and a backup ring (8) formed on the inner peripheral surface of the socket (1). Between the sealed packing stopper (14) and the backup ring (8) An inner peripheral surface and said plug arranged the socket (1) (2)
Packing (7) which is closely contacted with the outer peripheral surface of
And a quick connector. 2. The backup ring (8) according to claim 1, wherein an outer peripheral surface of the plug (2) is provided with a backup ring (8) on one side in the axial direction of the socket (1) when being connected to the socket (1). A quick connector, wherein a backup ring receiver (24) for restricting movement is formed. 3. The quick connector according to claim 1, wherein the socket (1), the plug (2) and the slider (4) are formed by plastic working of a metal material.