JPH0736229Y2 - Male pipe fitting - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a male pipe joint provided with a liquid leakage prevention valve, and is used for pairing with a female 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 hydraulic fluid can be filled in advance before the clutch master cylinder and the clutch operating cylinder are attached to the vehicle or the like. For example, Japanese Patent Laid-Open No. 60-143209 discloses 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 master 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 these internal parts is taken into consideration.

However, in such a conventional pipe joint, there are problems that the number of parts and the number of assembling steps increase, and that the area for sealing the high pressure becomes large and a high sealing performance is required.

The present invention has been made in order to solve the above problems, and particularly provides an improved technique for a male pipe joint.

(Outline of the Invention) In the present invention, as shown in FIGS. 1 and 3 corresponding to the embodiment, the joint main body 108 and the connecting portion 120 are integrally formed, and the first self-sealing is performed. The valve seat 132a is formed on the ring member 130 press-fitted on the other end side of the joint body 108.

In particular, in this invention, since the joint portion between the ring member 130 and the joint body 108 is made liquid-tight by press fitting, there is no need for a separate sealing material for sealing there. Further, if the outside of the portion that is made liquid-tight by press-fitting is double liquid-tightened by the sealing material (valve portion 44) of the female pipe joint 10, both male and female pipe joints can be obtained. It is possible to make the seal more reliable when the 100 and 10 are connected to each other.

This not only simplifies the overall structure, but also stabilizes the seal.

(Embodiment) As shown in FIG. 1, the male pipe joint 100 is paired with the female pipe joint 10 to function as a connector for connecting two devices. In this case, while the female pipe fitting 10 is connected to another device through the pipe, the male pipe fitting 10
0 is directly attached to the discharge part of one device without using piping. However, as mentioned earlier, it is also possible to reverse the arrangement of the male and female types, or to connect both male and female pipe joints to each device through pipes together. Of course.

First, referring to FIGS. 1 and 2, a female pipe joint 10 which is a counterpart of the male pipe joint 100 according to the present invention.
Will be described.

The female pipe joint 10 is integrally formed with 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 therein. 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 is open at one end.
It is provided in the center of the bottom opposite to a. Connection part 1
Needless to say, 2 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, but the large-diameter portion 16a has a male pipe fitting 100
A ring member 18 used when pulling out is arranged. The ring member 18 normally has its diameter expanded so as to follow the inner wall of the large diameter portion 16a of the joint body 16. However, the diameter can be reduced by pinching both ends 18a, 18b protruding outward, whereby the male pipe fitting 100 side retainer 1
The claw 102a of 02 can be removed. Further, in the joint body 16 itself, a tapered portion 16b is formed on the inner surface of the bottom portion, and the inner diameter of the portion 16c following the tapered portion 16b is slightly larger than the other adjacent portions, and the step portion 16d is formed. Has been formed. These step portion 16d and taper portion 16b are
It is important when assembling internal parts.

An internal member arranged inside the valve hole 14 of the joint member 16 of the female pipe joint 10 includes a locking member attached to the innermost part of the valve hole 14.
20, the valve rod 30 whose movement is restricted by the locking member 20, and the valve rod 30
A valve body 40 that cooperates with the pipe fitting 10 to create a self-sealing function.
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 a function of pushing the valve body 104 on the male pipe joint 100 side to release its self-seal when the female and male pipe joints 10 and 100 are joined. Become. Further, the end portion 36 is also formed with a tapered portion 36a that goes around once, and the tapered portion 3a is formed.
6a forms a valve seat for self-sealing in the female pipe joint 10.

It is the valve number 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. And, the portion closer to the opening 14a than the seal portion 44c is the opening
There is a tubular portion 44d with a wider mouth opening toward 14a. This tubular portion 44d has one end integrated with the main body of the valve portion 44, and the free end on the opposite side has a sealing portion for increasing the diameter of the tubular portion 44d itself. 44e
Have. Valve section with these seals 44e and 44c
44 functions as a seal member that seals around the valve hole 14 when both the male and female pipe joints 100, 10 are connected.
Therefore, it is not necessary to provide a seal ring or the like separately from the valve portion 44 in order to seal around the valve hole 14 with respect to the connecting portion. Such a valve body 40 has a ring shape and a valve rod.
Mounted around 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. This spring 50 is provided on the valve portion 44 of the valve body 40 before connecting the female and male pipe joints 10 and 100.
Is pressed against the tapered portion 36a on the valve rod 30 side to ensure the sealing action of the liquid leakage prevention valve.

Next, the male pipe joint 100 will be described with reference to FIG. 1 showing the connected state of both the female and male pipe joints 10 and 100, and FIG. 3 showing the state before the connection.

The male pipe joint 100 also includes a joint body 108 having an inner hole 106,
The connecting portion 120, which is a pipe connecting portion, is integrally formed of metal. The inner hole 106 is open on one side, and the other side communicates with the communication hole 120a of the connecting portion 120. Fitting body 108
Has a size such that its outer diameter fits into the valve hole 14 of the joint body 16 of the female pipe joint 10. A ring member 130 is press-fitted into the outer peripheral portion of the joint body 108 on the opening side, and a retaining member 102 is fitted on the side closer to the connecting portion 120. The ring-shaped retainer 102 has the plurality of claws 102a as described above. Further, the portion 108a of the joint body 108 into which the ring member 130 is press-fitted has a slightly smaller diameter. Ring member 130
Has a small diameter portion 132 press-fitted into the inner circumference of the portion 108a and a large diameter portion 134 adjacent thereto. Here, the large diameter portion 134
The outer diameter of is equal to the outer diameter of the portion 108a on the joint body 108 side, so that a space into which the female cylindrical portion 44d is inserted is provided in the outer peripheral portion. The ring member 13
The press-fitting portion of 0 ensures that the seal at low pressure, that is, the seal in the state in which the working pressure before connection is not applied is retained.

On such a ring member 130, a tapered first valve seat 132a is formed at the end of the small diameter portion 132, and a flat second valve seat 134a is formed at the end of the large diameter portion 134 on the opposite side. There is. The flat second valve seat 134a is used for both female and male pipe joints.
When the 10,100 are connected to each other, the female pipe joint 10 is contacted with one surface of the valve portion 44 of the valve body 40, and the portion is sealed. On the other hand, the tapered first valve seat 132a faces the valve element 104 arranged inside the inner hole 106, and produces the self-sealing function of the male pipe joint 100. Inner spring 136
Pushes the valve body 104 to ensure a seal against the first valve seat 132a.

Since the male pipe joint 100 and the female pipe joint 10 both have a self-sealing function, they can be effectively filled with hydraulic fluid in a form in which they are connected to each device.
Then, for each of them, the hydraulic fluid is filled in advance, and
After mounting on a vehicle or the like, by connecting the female and male pipe joints 10 and 100 to each other, the self-sealing action of each can be released.

In the illustrated embodiment, the tubular portion 4 having the seal portion 44e is provided.
Since 4d is provided integrally with the valve part 44, the number of parts of the sealing material can be minimized, but the sealing part
The sealing function of 44e may be performed by a seal ring set on the male part 108a.

Further, the second valve seat 134a for sealing at the time of connection may be provided not on the ring member 130 but on the joint body 108 itself.

(Effect of the Invention) According to this invention, it is possible to obtain a male pipe joint having a simplified overall structure and improved seal stability.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which the male pipe joint of the present invention and a female pipe joint to be paired therewith are connected, and FIG. 2 is a connection of the female pipe joint in FIG. FIG. 3 is a side sectional view showing the previous state, and FIG. 3 is a side sectional view showing the male pipe joint in FIG. 1 before the connection. 10 …… Female piping joint, 100 …… Male piping joint, 104 …… Valve body, 106 …… Inner hole, 108 …… Coupling body, 120 …… Connecting part, 130 …… Ring member, 132a …… No. 1 seat, 134a ...
… Second valve seat, 136… Spring.

Claims (2)

[Scope of utility model registration request] 1. A male pipe joint which is paired with a female pipe joint and is used for connecting between two devices, wherein one end has a connecting portion connected to one device side, and the other. A joint body whose end side is fitted into the inside of the female pipe joint, a first valve seat formed on the other end side of the inner hole of the joint body, and a female body arranged in the inner hole of the joint body, In a male pipe joint provided with a valve body which is separated from the first valve seat by the fitting into the pipe joint, the joint body and the connecting portion are integrally formed, and the first valve seat is also provided. Is formed on the other end of the joint body to be liquid-tightly joined by press fitting, and the outside of the joint portion between the ring member and the joint body, which is fluid-tightly joined by the press fitting, is connected to the female pipe. The arrangement of each female-male pipe joint that double seals with the sealing material on the joint side. To the male pipe joint. 2. The ring member according to claim 1, wherein when the male and female pipe joints are connected to each other, the ring member seals by contacting an internal part of the female pipe joint.
Male pipe fitting with the valve seat of.