JPH0712797Y2 - Female pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a female pipe joint equipped with a liquid leakage prevention valve, and is used for pairing with a male pipe joint to connect two devices. In particular, the present invention relates to a technique suitable for use in connecting two devices, such as a master cylinder and an operating cylinder, which are assembled in a vehicle or the like in a clutch actuating device of a vehicle or the like.

(Prior Art) Two male and female pipe joints that are connected to each other, each of which is provided with a liquid leakage prevention valve, are known.

The male and female pipe joints are self-sealed by a liquid leakage prevention valve before they are connected to each other. However, when both the male type and the female type are connected to each other, the self-sealing of each is released, and the interior is in communication. Therefore, by using them, the clutch mass cylinder and the clutch operating cylinder are
The hydraulic fluid can be pre-filled before mounting on a vehicle or the like. For example, the publication of JP-A-60-143209 clarifies the above.

(Problems to be Solved by the Invention) In each pipe joint as described above, it may be directly connected to each device such as a mass cylinder or an operating cylinder, or may be connected through a pipe. However, in any case, a nipple portion or the like as a connecting portion is essential.

Conventionally, such a connecting portion has been separated from the joint body. It is considered that this is because the fitting main body is provided with the liquid leakage prevention valve for self-sealing, and therefore the assembling of the internal parts thereof is taken into consideration.

The present inventor has considered integrating the joint body and the connecting portion in order to reduce the number of parts and the number of assembling steps. As a result, when connecting both male and female pipe joints, there is not much problem with male pipe joints that release self-sealing by the female valve stem, but when connecting, the male pipe joint It has been found that, in the case of a female pipe joint that is pushed by the joint body to release the self-sealing, it becomes difficult to assemble the internal parts when integrated. In particular, the assembling difficulty becomes greater in the case where the pipe joint is directly assembled in the cylinder.

The present invention provides an improved technique for a female pipe joint, and an object thereof is to integrate the connecting portion and the joint body and to make the assembly easy.

(Outline of the Invention) In this invention, as shown in FIGS. 1 and 3 corresponding to the embodiment, the connecting portion 12 and the joint body 16 are integrally formed, and the movement of the valve rod 30 is restricted. The locking member 20 is formed of an elastic material such as plastic, and the locking member 20 is formed inside the valve hole 14 from the opening side of the valve hole 14 of the joint body 16.
It is configured to be elastically deformed and inserted to exceed d, and to be engaged with the step portion 16d by restoring deformation. As a result, in addition to the advantage due to the integration, there is an advantage that the internal parts such as the locking member 20 and the valve rod 30 can be easily inserted and assembled into the valve hole 14 of the joint body 16.

In particular, in this invention, the valve hole 14 is a stepped hole having a small diameter on the opening side, and an engaging portion on the outer peripheral portion of the locking member 20 that is larger in diameter than the small diameter portion of the valve hole 14 and is elastically deformable in the diameter reducing direction. (Cylindrical part 24
b) is formed, the engaging portion is reduced in diameter and inserted into the valve hole 14, and the restoring force causes the engaging portion to engage with the step portion 16d between the small diameter portion and the large diameter portion. There is. Therefore, the engaging member 20 can be easily assembled only by inserting it into the valve hole 14. When the engaging member 20 is assembled, the joint body 16 forming the valve hole 14 can be securely assembled without any processing.

(Embodiment 1) ... See FIGS. 1 to 4. The female pipe joint 10 is a male pipe joint as shown in FIG.
Pairs with 60 to function as a connector that connects two devices. In this case, the male pipe joint 60 is directly attached to the discharge part or the like of one device without using pipes, whereas the female pipe joint 10 is connected to another device through the pipe. However, as described above, it is of course possible to reverse the arrangement of the male type and the female type, or connect both the male type and female type pipe joints to the respective devices through the pipes. Is.

First, the female pipe joint 10 will be described mainly with reference to FIGS. 1 and 3.

In the female pipe joint 10, a connecting portion 12 such as a nipple portion to which a pipe is connected and a joint body 16 having a valve hole 14 are integrally formed. The connecting portion 12 and the joint body 16 are made of metal and are integrated. The valve hole 14 is provided along the axis of the joint body 16 and has one end opened, and the connection portion 12 is provided at the center of the bottom portion opposite to the opening portion 14a. The connecting part 12 is
Needless to say, it has a communication hole 12a that communicates with the valve hole 14.
A part 16a of the joint body 16 near the opening 14a has a slightly larger diameter, and a ring member 18 used when pulling out the male pipe joint 60 is arranged in the larger diameter portion 16a. As can be seen from FIG. 2, the ring member 18 always has the joint body 16
The diameter is enlarged so as to follow the inner wall of the large diameter portion 16a.
However, it is possible to reduce the diameter by pinching the both end portions 18a and 18b protruding outward, whereby the pawl 62a of the retaining member 62 on the male pipe joint 60 side can be removed. Further, the joint body 16 itself has a tapered portion on the inner surface of the bottom.
16b is formed, and the portion 16 following the tapered portion 16b is formed.
The inner diameter of c is slightly larger than the other adjacent portions, and a step portion 16d is formed. The step portion 16d and the taper portion 16b are important in assembling the internal parts. That point will become clear from the explanation that follows.

The internal member arranged in the valve hole 14 of the joint member 16 of the female pipe joint 10 includes a locking member 20 attached to the innermost part of the valve hole 14.
And a valve rod 30 whose movement is restricted by the locking member 20, and a valve body 40 which cooperates with the valve rod 30 to cause a self-sealing function of the pipe joint 10.
And a spring 50 that applies a biasing force to the valve body 40.

The locking member 20 is a molded plastic product, and is composed of a head 22 having a tapered surface 22a at its tip and an internal hollow body 24 extending from the rear end of the head 22. In addition to the central hole 22b through which the valve rod 30 is passed, the head portion 22 is formed with a radial cutout hole 22c around the central hole 22b and a recess 22d for facilitating the communication of the liquid toward the connecting portion 12. . On the other hand, the body portion 24 is thinner than the head portion 22, and is composed of a conical portion 24a on the head portion 22 side and a cylindrical portion 24b following the conical portion 24a. Cylindrical part 24b
The outer diameter of is substantially equal to the diameter of the inner portion 16c of the valve hole 14, and the diameter of the tip of the conical portion 24a is set to be slightly smaller than the inner diameter of the joint body 16. Moreover, the body portion 24 has notches 24c formed along the axial direction at a plurality of positions in the circumferential direction. Each of the plurality of notches 24c divides the body portion 24, whereby the body portion 24 can be reasonably elastically deformed when the body portion 24 is inserted deep into the valve hole 14 of the joint body 16. . Such a locking member 20 has a step portion 16
Although it is inserted to the innermost part of the valve hole 14 beyond d, the tapered surface 22a at the tip of the head portion 22 acts so that the center of the locking member 20 is aligned with the axis of the joint body 16 at that time. , Stable assembly can be performed. Then, once assembled, the step portion 16d serves as a stopper, so that the locking member 20 is prevented from coming off. The actual assembly is performed with other parts attached.

The valve rod 30 is coupled to the locking member 20 such that the tip portion thereof penetrates the central hole 22b of the locking member 20. At the tip of the valve stem 30, place two suitable flanges at an appropriate distance.
32,34 are provided. These flanges 32 and 34 limit the movement of the valve rod 30 with respect to the locking member 20.
The moving range of the valve rod 30 is limited by the distance between the flanges 32 and 34, but the moving range can be set to almost zero within a range where no problem occurs in the attachment of the valve rod 30 and the locking member 20. . The opposite end 36 of the valve rod 30 has the effect of pushing the valve body 64 on the male pipe joint 60 side to release its self-seal when the female and male pipe joints 10, 60 are joined. It will be. Further, the end portion 36 is also formed with a tapered portion 36a that goes around once, and the tapered portion 36a is formed.
Form a valve seat for self-sealing in the female pipe fitting 10.

It is the valve body 40 that cooperates with the valve seat to form a liquid leakage prevention valve for self-sealing. The valve body 40 includes a main body 42 made of a rigid material such as metal, and a rubber valve portion 44 supported by the main body 42. The main body 42 has a large-diameter portion 42 having a relatively large diameter that is movable along the inner wall of the valve hole 14.
and a small-diameter mounting portion 42d having a mounting flange 42b and a mounting groove 42c. On the other hand, rubber valve part 44
Has a mounting portion 44a corresponding to the mounting portion 42d on the main body 42 side on one side of its inner circumference, and a portion 44b seated on the valve seat provided on the valve rod 30 on the other side of its inner circumference. Further, on the outer peripheral side of the rubber valve portion 44, the valve hole 14 or the joint body 16
There is a seal portion 44c that tightly engages the inner wall of the. Such a valve body 40 is ring-shaped and is mounted around the valve rod 30.
A coil-shaped spring 50 is provided between one side of the head 22 of the locking member 20 and one side of the main body 42 of the valve body 40. Spring 50
Before connecting both the female and male pipe joints 10 and 60, the valve portion 44 of the valve body 40 is connected to the taper portion 36 on the valve rod 30 side.
It is pressed against a to ensure the sealing action of the liquid leakage prevention valve.

Next, the male pipe joint 60 will be described with reference to FIG. 1 showing the connected state of both the female and male pipe joints 10, 60 and FIG. 4 showing the state before the connection. .

Also in the male pipe joint 60, a joint main body 68 having an inner hole 66 and a connecting portion 70 which is a pipe connecting portion are integrally formed of metal. The inner hole 66 is opened on one side and the connecting portion 70 on the other side.
To the communication hole 70a. The outer diameter of the joint body 68 is sized to fit into the valve hole 14 of the joint body 16 of the female pipe joint 10. A rubber seal ring 72 is provided on the outer peripheral portion of the joint body 16 on the opening side, and a retaining member 62 is provided on the side closer to the connecting portion 70. Ring-shaped retainer 62
Has a plurality of claws 62a as described above. A ring member 74 made of metal is also lightly pressed into the open end of the joint body 68 having the seal ring 72. The press-fitting portion keeps the seal at a low pressure, that is, the seal in a state where no working pressure is applied before connection. The ring member 74 has a tapered valve seat 74a at the end to be press-fitted,
Another flat valve seat 74b at the opposite end of the slightly larger diameter
Are formed respectively. When the flat valve seat 74b connects both female and male pipe joints 10, 60 to each other,
The female pipe joint 10 is pressed against one surface of the valve portion 44 of the valve body 40, and the portion is sealed. On the other hand, the tapered valve seat 74
a is opposed to the valve body 64 arranged inside the inner hole 66, and causes the male pipe joint 60 to have a self-sealing function. An internal spring 76 pushes the valve body 64 ensuring a seal against the valve seat 74a.

Since the male pipe joint 60 and the female pipe joint 10 both have a self-sealing function, the hydraulic fluid can be effectively filled in a form in which they are connected to each device. Then, for each of them, the self-sealing action of each can be released by pre-filling with the hydraulic fluid, and further, after mounting on a vehicle or the like, by connecting the female and male pipe joints 10 and 60 to each other. it can.

(Embodiment 2) See FIG. 5. FIG. 5 shows a female pipe joint 10 'in which the connecting portion 12' is made of metal, the joint body 16 'is made of plastic, and both of them are integrated.

The connecting portion 12 'of the female pipe joint 10' has a large diameter portion 121 integrally joined to the joint body 16 'by molding. The plastic locking member 20 'has a large diameter portion 121.
Since it is disposed inside, the inward flange 122 as a step is formed at the end of the large diameter portion 121. Locking member 2
The 0'has a head portion 22 'and a body portion 24', but here, there are two types, that is, a piece 241 in which the body portion 24 'is inclined with respect to the axis and a piece 242 that is parallel to the axis. Become. 24 pieces each
The 1,242 are arranged at a plurality of positions in the circumferential direction.
When inserting the locking member 20 ′, the one piece 241 hits the inward flange 122 and elastically deforms, enters the large diameter portion 121, and when it crosses the inward flange 122, expands so as to return to the original state. The rear end engages the inward flange 122. On the other hand, the other piece 242 is arranged to match the diameter of the portion of the inward flange 122. Therefore, the two types of pieces 241, 242 can position the locking member 20 'in cooperation with each other. Further, the parallel pieces 242 have an outward flange 242a at the rear end. The outward flanges 242a are the inward flanges 122 on the side of the connecting portion 12 '.
And supports the seal ring 80. Seal ring 80
Is for preventing liquid leakage from the joint between the connecting portion 12 'and the joint body 16'.

Also in this embodiment, the engaging member 20 'can be easily assembled even though the connecting portion 12' and the joint body 16 'are integrated.

In each embodiment, the locking members 20 and 20 'are all made of plastic, but a part of them may be made of metal.

Further, the ring member 18 is a female and male pipe joint 1
This is effective for removing 0 and 60, but it is also possible to omit it and use a screwdriver or the like to perform removal.

(Effect of the Invention) According to the present invention, it is possible to obtain a female pipe joint that can reduce the number of parts as a whole and that can easily assemble internal parts.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a female pipe joint of the present invention and a state in which it is connected to a male pipe joint to be paired with it, and FIG. 2 is a front sectional view of the female pipe joint in FIG. Fig. 3 is a side sectional view showing the female pipe joint in Fig. 1 before connection, and Fig. 4 is a side sectional view showing the male pipe joint in Fig. 1 before connection. 5 and 5 are side sectional views showing another embodiment of the female pipe joint. 10, 10 '... Female pipe joint, 12, 12' ... Connection part, 14 ... Valve hole, 16, 16 '... Joint body, 18 ... Ring member, 20, 20' ... Locking member, 30 ... Valve rod, 40 ... Valve body, 50 ... Spring, 60 ... Male pipe joint.

Claims (1)

[Scope of utility model registration request] 1. A female pipe joint which is paired with a male pipe joint and is used for connecting between two devices, wherein a connecting portion connected to one device side and a valve having one end opened. A joint body having a hole into which a male pipe joint can be fitted, a locking member mounted in the valve hole, a valve rod restricted in movement by the locking member, and inner walls of the valve rod and the valve hole. A valve body that is closely engaged with the male pipe joint and is moved to the inner side of the valve hole by the fitting of the male pipe joint to release the tight engagement with the valve rod; In a female pipe joint having a spring that urges the valve rod to come into close contact with the valve rod, the connecting portion and the joint body are integrally formed, and the valve hole has a stepped hole with a small diameter on the opening side. And an engaging portion, which is larger in diameter than the small diameter portion of the valve hole and elastically deformable in the diameter reducing direction, is formed on the outer peripheral portion of the locking member. Female pipe fitting which is adapted to engage a stepped portion between the parts reduced in diameter to be inserted into the valve hole small diameter portion and the large diameter portion of the valve hole by its restoring force.