JPH0343513Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is applicable to piping for hydraulic and pneumatic equipment.
This invention relates to a pipe joint that allows male members to be connected easily and quickly.

(Prior Art) Pipe joints, as shown in FIG. 5, are widely used in piping for hydraulic and pneumatic equipment, such as hydraulic operation of working units of industrial vehicles, power steering of general vehicles, and air conditioning.

In other words, the female member connected to one pipe
A′ is a cylindrical body with a stepped inner hole a;
The outer periphery has a threaded part d for connecting pipes at one end, a square brim b for gripping in the center, and a threaded part c for connection at the other end.
is provided, and the male member B' connected to the other pipe is a cylindrical body with a thickness that can be inserted into the large diameter part of the inner hole a of the female member A', and has a uniform inner hole e, A threaded portion f for connecting the pipe is provided at the outer end, and a union nut n is rotatably provided at the center of the outer periphery via a locking collar g. The female and male members A' and B' are connected by fitting into the large diameter part of the hole a and screwing the union nut n into the connecting screw part c.

(Problems to be solved by the invention) In the above-mentioned conventional pipe joints, the male member is fitted onto the female member, and then the union nut is screwed in to connect the two members, which takes time and involves a lot of effort. There is a drawback that it is difficult to perform the joining work at the place where they are inserted, and in consideration of this point, the female and male parts were connected by insertion rather than screwing. No. 12023 is known, but these have a large number of parts and complex configurations, require special processing, and connecting the female and male parts requires not only insertion operations but also additional operations, which is not simple. do not have.

Therefore, this invention provides a pipe joint that has a simple structure, can be joined by the simple operation of inserting the male member into the female member, does not require special processing or parts, and can be produced at low cost. .

(Means and effects for solving the problem) Based on the above purpose, this invention is a pipe joint that is connected from the pipe connection part to the inside of a cylindrical body with one end as a pipe connection part and the other end as a joint part. A fluid passage hole, a medium-diameter fitting hole, a large-diameter fitting hole, and a screw hole of a larger diameter are provided across the section, and the screw hole has a fitting hole that is approximately equal to the large-diameter fitting hole, and a fitting hole from this at the tip. A fastener having a blind hole with a large diameter and a required width is screwed onto the fastener, and the outer diameter is inserted into the annular cavity formed by the blind hole, the large diameter fitting hole, and the boundary wall of the screw hole. The coupling side consists of a female member that is movably disposed in the radial direction with a retainer ring that has a larger diameter and an inner diameter smaller than that of the male member's straight cylindrical part and can be contracted and expanded, and a cylindrical body that has a fluid passage hole inside. The end portion is provided with a front cylindrical portion and a tapered portion that are inserted into the medium diameter fitting hole of the female member, and a straight cylindrical portion that is fitted into the fitting hole of the female member and the stopper, and the retainer is placed at a predetermined position of the straight cylindrical portion. The male member has an annular groove for engaging the ring, and the tip of the male member is inserted into the fitting hole of the stopper and the large-diameter and medium-diameter fitting holes of the female member. When the cylindrical part and the straight cylindrical part are inserted, the retainer ring is pushed open by the circumferential surface of the male tapered part and moves in the radial direction, and when the annular groove comes inside, the retainer ring's diameter is reduced. The female and male members are coupled by engaging with the annular groove.

Also, by unscrewing the tool starting from the coupling portion of the female member, the male member, along with the stop and retainer ring, is separated from the female member.

(Example) Fig. 1 shows the pipe joint according to this invention separated, and A is a female member consisting of a stepped cylindrical body, and one half (left side in the figure) has a tapered outer periphery. The pipe connection part 1a is equipped with a screw, and the other half forms a thick joint part 1b with a polygonal outer surface.A fluid passage hole 2a is provided inside the pipe connection part 1a, and A medium-diameter fitting hole 2b and a large-diameter fitting hole 2c are formed next to the fluid passage hole 2a, and a screw hole 2d with a larger diameter than the fitting hole is provided at the coupling side end. 2d has a polygonal collar 3 on the connecting end.
A short cylindrical stopper 3 with a is screwed together,
This stopper 3 has a large diameter fitting hole 2 in the joint part 1b inside.
It has a fitting hole 3c with the same diameter as the fitting hole 3c, and a blind hole 3b which is larger in diameter and narrower than the fitting hole 3c is provided at the tip. 2c and the boundary wall 1c between the screw holes 2d, the annular cavity is partially separated to form a C shape as shown in Fig. 2, and the outer diameter is smaller than the diameter of the fitting holes 2c and 3c. A retainer ring 4 whose inner diameter is larger than that of a straight cylindrical portion 6c of a male member B, which will be described next, is disposed so as to be slidable in the radial direction.

Further, a seal ring 5 is embedded in an annular recess formed in the middle of the medium diameter fitting hole 2b.

On the other hand, the male member B is an elongated cylindrical body having a uniform fluid passage hole 7 almost equal to the fluid passage hole 2a of the female member A, and has a medium diameter fitting hole in the coupling side end. A front cylindrical part 6a whose diameter and length are approximately equal to each other, followed by a tapered part 6b and a straight cylindrical part 6c whose outer diameter is approximately equal to the diameter of the large diameter fitting holes 2c and 3c of the female member are provided. The straight cylindrical portion 6c has a distance from the coupling side end surface from the boundary step between the fluid passage hole 2a and the medium-diameter fitting hole 2b in the female member A to the boundary wall 1c between the large-diameter fitting hole 2c and the screw hole 2d. An annular groove 8 whose width is slightly larger than the width of the retainer ring 4 and whose depth is smaller than the wall thickness of the ring 4 is formed at a position equal to the distance, and a polygonal grip is formed on the outer end side of the straight cylindrical portion 6c. A piping connection portion 6e having a tapered thread on the outer periphery is provided with a collar 6d. However, instead of using a tapered thread for this piping connection, a socket may be attached to the cylindrical body, and the hose may be caulked between the cylindrical body and the socket. Furthermore, by machining the front cylindrical portion 6a, the tapered portion 6b, and the annular groove 8 on the pipe, it can also be used as a pipe connector.

Therefore, when connecting the female and male members A and B, grasp the male side collar 6d and
The fitting hole 3c of the stopper and the large diameter fitting hole 2 of the female member A
C, the retainer ring 4 disposed in the blind hole 3b at the tip of the stopper 3 is pushed open by the circumferential surface of the male tapered part 6b while the female and male members A are inserted. , the blind hole 3 so as to align with the axis of B.
When the retainer ring 4 moves slightly in the radial direction in the radial direction and reaches the male side annular groove 8 on the inner side, the retainer ring 4 decreases in diameter and falls into the groove 8 as shown in FIG. Male members A and B are coupled.

Further, in the coupled state, both members A and B are separated by unscrewing the stopper 3 from the coupling portion 1b of the female member A and pulling out the male member B. At that time, the stopper 3 and the retainer ring 4 are removed from the female member A together as the male member B. and,
For reuse, move the stopper 3 that has become flush with the male member B back so that it comes into contact with the collar 6d,
Pull a tool such as a screwdriver to the separated part of the retainer ring 4 that is engaged with the annular groove 8, and open it outward to remove the retainer ring 4 and remove the stopper 3 from the male member B. Assemble it to the connecting part 1c of the female member A as shown in Figure 1.

Note that the retainer ring 4 is not limited to one with a uniform thickness as shown in Figure 2;
Inward protrusions 4b of a required height may be provided at multiple locations inside the ligature-shaped horizontal thin plate 4a, or a strip plate 4c of a constant width may be wound twice in a coil shape as shown in FIG. They may be stacked one on top of the other and have cutout portions 4d at both ends for locking tools. Of course, the inner and outer diameters and widths of these rings are the same as those of the ring shown in FIG.

(Effects of the invention) As described above, in this invention, a short cylindrical stopper with a blind hole at the tip is screwed into the screw hole in the coupling side end member of the female member, and the blind hole and the female member A retainer ring that can be contracted and expanded in diameter is disposed movably in the radial direction in the annular space formed by the large-diameter fitting hole and the boundary wall of the threaded part, and this retainer ring is attached to the tapered part of the male member. Since the male member is engaged with the annular groove provided at a predetermined position in the straight cylinder part, it is possible to easily connect the two parts with one touch by simply inserting the male member into the female member. It is less time-consuming than conventional plug-in types, and the connection operation is simpler than conventional plug-in types, making it easier to work in crowded areas.In addition, it has fewer parts and is easy to construct. Furthermore, when separated, the retainer ring can be easily removed from the annular groove and can be reused.Furthermore, since a large diameter union nut is not required, it can be manufactured compactly and inexpensively.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of an embodiment of this invention in a separated state. FIG. 2 is a perspective view of an example of a retainer ring. FIG. 3 is a half-sectional side view of the combined state. FIGS. 4A and 4B are perspective views of modified examples of the retainer ring. FIG. 5 is a half-sectional side view of a conventional joint. In the figure, A...female member, B...male member, 1a...
Piping connection part, 1b...Joining part, 2b...Medium diameter fitting hole, 2c...Large diameter fitting hole, 3...Stopper, 3b...
... Blind hole, 3c... Fitting hole, 6a... Front tube part, 6b
...Tapered portion, 8...Annular groove.

Claims (1)

[Scope of utility model registration request] Inside the cylindrical body, which has one end as the pipe connection part 1a and the other end as the joint part 1b, there are a fluid passage hole 2a, a medium diameter fitting hole 2b, a large diameter fitting hole 2c and the like from the pipe connection part 1a to the joint part 1b. A screw hole 2d with a larger diameter than this is provided, and the screw hole 2d has a fitting hole 3c approximately equal to the large diameter fitting hole 2c, and a stopper 3 having a blind hole 3b with a larger diameter and a required width at the tip. is screwed into the annular space formed by the blind hole 3b, the large-diameter fitting hole 2c, and the boundary wall 1c of the screw hole 2d. Retainer ring 4 that is smaller in diameter than the male member straight cylindrical part 6c and can be expanded in diameter
The female member A is arranged to be movable in the radial direction, and the leading cylinder part 6a is inserted into the medium diameter fitting hole 2b of the female member at the coupling side end. and a tapered part 6b, and a straight cylindrical part 6c that is fitted into the large diameter fitting holes 2c and 3c of the female member and the stopper, and an annular recess that engages the retainer ring 4 at a predetermined position of the straight cylindrical part 6c. A pipe joint consisting of a male member B in which a groove 8 is formed.