JP5003952B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint used for connection of fluid piping, and in particular, a female coupling and a male coupling that enable coupling and separation, and the engagement of rolling elements such as balls and recesses in the coupling of both couplings. It relates to the pipe joint used.

  FIG. 1 and FIG. 2 (A) show a conventional pipe joint that uses engagement between a rolling element such as a ball and a recess for coupling a female coupling and a male coupling. FIG. 1 is a partially broken side view of a state where a female coupling and a male coupling are coupled, and FIG. 2A is an enlarged view of a portion A in FIG. In the following description, the left in FIG.

  The female coupling 10 includes a substantially cylindrical first sleeve 11, a second sleeve 12 disposed on the outer surface of the front portion of the first sleeve 11 so as to be movable back and forth, and a first biasing the second sleeve 12 backward. The spring member 13, the third sleeve 14 fixed to the first sleeve so as to cover the front outer surface of the first sleeve 11 and the second sleeve 12, and the rear outer surface of the third sleeve 14 are arranged to be movable back and forth. The operation sleeve 15, the second spring material 16 for urging the operation sleeve 15 rearward, the plurality of holes 14a provided in the rear portion of the third sleeve 14 at intervals in the circumferential direction, and a part of the holes 14a. A plurality of balls 17 rotatably disposed in the respective holes 14a so as to be exposed from the inner side opening of the sleeve, and a stopper which is fixed to the outer surface of the rear end portion of the third sleeve 14 and restricts the backward movement of the operation sleeve 15 With ring 18 Conical tapered portion 14a1 for preventing falling off to limit the inward movement to the inner surface of the third sleeve 14 of the inner side opening in part the ball 17 is provided in each hole 14a. On the other hand, the male coupling 20 has a substantially cylindrical sleeve 21, and an annular recess 21 a in which an inwardly exposed portion of each ball 17 can be engaged is provided at a predetermined position on the outer surface of the sleeve 21.

  When the female coupling 10 and the male coupling 20 are coupled, the operation sleeve 15 of the female coupling 10 is moved forward against the urging force of the second spring member 16 by a fingertip or the like, and each ball 17 is moved outward. After allowing it to move, the front part of the sleeve 21 of the male coupling 20 is inserted into the female coupling 10 from the rear side. Then, the second sleeve 12 of the female coupling 10 is pressed against the urging force of the first spring member 13 by the front end of the inserted male coupling 20 and moved forward to move the front end of the second sleeve 12 to the first position. One sleeve 11 is brought into contact with an annular step (no symbol). Then, the operation sleeve 15 of the female coupling 10 is returned by the urging force of the second spring material 16. By the return of the operation sleeve 15, each ball 17 is pressed inward, and each exposed portion on the inner side enters the annular recess 21 a of the male coupling 20 and engages.

When the female coupling 10 and the male coupling 20 are separated, the operation sleeve 15 of the female coupling 10 is moved forward against the urging force of the second spring member 16 by a fingertip or the like, so that each ball 17 is removed. Then, the front part of the sleeve 21 of the male coupling 20 is pulled out from the inside of the female coupling 10. Then, the operation sleeve 15 of the female coupling 10 is returned by the urging force of the second spring material 16.
JP 2001-295976 A

  Since the aforementioned pipe joint is used to connect a fluid pipe through which hydraulic fluid or the like circulates, the main cause of the fluid pressure change in the pipe joint is as shown in FIG. A burr DP is generated inward at the periphery of the side opening.

As shown in FIGS. 2A and 2B, a predetermined clearance a exists between the inner surface of the third sleeve 14 of the female coupling 10 and the outer surface of the sleeve 21 of the male coupling 20, When the dimension c of the burr DP (see FIG. 2B) exceeds the clearance a, the burr DP will be male even if the front part of the sleeve 21 of the male coupling 20 is pulled out from the inside of the female coupling 10 during separation. Even if the front part of the sleeve 21 of the male coupling 20 is inserted into the inner side from the rear side of the female coupling 10 at the time of coupling, the burr DP is not caught. There no longer be inserted stuck on the outer surface of the sleeves 21 of the male coupling 20.

  This problem can be solved to some extent by increasing the clearance a in advance. However, if the clearance a is increased, the female coupling 10 and the male coupling 20 are wobbled in the coupled state. 17 and the annular recess 21a become unstable, and new problems such as a decrease in the life of the seal portion occur.

  The present invention was created in view of the above circumstances, and the object of the present invention is to connect both couplings even if burrs occur at the periphery of the opening on the inner side of the hole in which the rolling elements are rotatably arranged. It is another object of the present invention to provide a pipe joint that can be separated without any trouble.

  In order to achieve the above object, the present invention provides a female coupling and a male coupling that enable coupling and separation, and a pipe joint that uses engagement between a rolling element such as a ball and a recess for coupling of both couplings. The sleeve of the female coupling is provided with a rolling element disposed in the hole so that the rolling element is arranged and a part of the hole is exposed from the inner opening of the hole. Is provided with a recess capable of engaging with an exposed portion on the inner side of the rolling element, and a recess for increasing the inner exposed area of the rolling member is provided at a peripheral edge of the inner opening of the hole. It is characterized by being provided in depth.

  According to this pipe joint, a recess for increasing the exposed area on the inner side of the ball is provided at a predetermined depth on the periphery of the inner opening of the hole provided in the sleeve of the female coupling, and Since a predetermined clearance exists between the inner surface of the female coupling sleeve and the outer surface of the male coupling sleeve, the distance until the burr reaches the male coupling sleeve according to the depth + the clearance value. Can be secured.

  The depth is determined in consideration of the clearance and the size of burrs that can occur in normal use. Therefore, even if burrs occur in the normal use range, the front part of the male coupling sleeve is separated from the female coupling during separation. When pulling out from the inside, the burr is not caught by the outer surface of the male coupling sleeve, and the front part of the male coupling sleeve is inserted into the inner side from the rear side of the female coupling for coupling. In this case, the burr does not get caught by the outer surface of the male coupling sleeve and cannot be inserted.

  ADVANTAGE OF THE INVENTION According to this invention, even if a burr | flash generate | occur | produces in the periphery of the inner side opening of the hole by which the rolling element was rotatably arrange | positioned, the pipe joint which can perform coupling | bonding and isolation | separation of both couplings can be provided.

  The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

[First Embodiment]
3 and 4 show a first embodiment of the present invention (pipe joint). FIG. 3 (A) is a view corresponding to FIG. 2 (A), and FIG. 3 (B) is a male cup from FIG. 3 (A). FIG. 4 is a diagram in which the sleeve 21 and the ball 17 of the ring 20 are removed, and FIG. In the following description, reference is made to FIG. 1 and the names and symbols used in the description, and the left in FIG.

  The pipe joint of the first embodiment is different from the pipe joint shown in FIG. 1 in that each of the pipe joints provided on the third sleeve 14 of the female coupling 10 as shown in FIGS. 3 (A) and 3 (B). A recess 14b for increasing the exposed area on the inner side of the ball 17 is locally provided on the rear side portion of the peripheral edge of the inner opening of the hole 14a, specifically, a range including the rear peripheral edge of each hole 14a, for example, It is in the point provided in the range of 180 degree | times from the front-back center to the back side. In addition, the code | symbol y in FIG. 3 (B) shows the depth of the hole 14a, and the code | symbol x shows the depth of the taper part 14a1.

  Although the recess 14b may be provided for each hole 14a, it may be provided as a common hole for each hole 14a by forming an annular recess on the inner surface of the third sleeve 14 as illustrated. The depth b of the recess 14b is preferably set within a range of 1% to 7% of the diameter of the ball 17. If the depth b of the recess 14b is less than 1% of the diameter of the ball 17, it will be difficult to obtain the effects described later. If the depth b exceeds 7% of the diameter of the ball 17, the third sleeve of the female coupling 10 will be obtained. 14 may decrease in strength.

  Since the pipe joint according to the first embodiment is also used for connecting a fluid pipe through which hydraulic fluid or the like is circulated in the same manner as the conventional pipe joint shown in FIG. 1, the main cause of the pressure change of the fluid in the pipe joint As shown in FIG. 4, the burrs DP are generated inward at the rear side portion of the periphery of the inner opening of each hole 14a.

  However, in the pipe joint of the first embodiment, the inner side exposure of the ball 17 is exposed at the rear side portion of the peripheral edge of the inner side opening of each hole 14a provided in the third sleeve 14 of the female coupling 10. A recess 14b for increasing the area is locally provided at a predetermined depth b, and between the inner surface of the third sleeve 14 of the female coupling 10 and the outer surface of the sleeve 21 of the male coupling 20. Since the predetermined clearance a exists, the distance until the burr DP reaches the sleeve 21 of the male coupling 20 can be secured by the value of the depth b + the clearance a.

  The depth b is determined in consideration of the clearance a and the dimension c of the burr DP that can occur in normal use. Therefore, even if the burr DP is generated in the normal use range, the sleeve 21 of the male coupling 20 is separated during separation. When the front part is pulled out from the inside of the female coupling 10, the burr DP is not caught by the outer surface of the sleeve 21 of the male coupling 20 and cannot be removed. When the portion is inserted from the rear side of the female coupling 10 to the inside thereof, the burr DP is not caught by the outer surface of the sleeve 21 of the male coupling 20 and cannot be inserted.

  Here, an experimental example for demonstrating the effect is introduced.

  In the first experiment, an impact pressure of 60 MPa is applied to hydraulic fluid (normal temperature) flowing through the pipe joint by using the pipe joint of the first embodiment for connection of a fluid pipe through which hydraulic fluid flows. The durability test was repeated 100 to 2 million times, and the dimension c of the burr DP generated by the durability test, the coupling operability and the separation operability of both couplings 10 and 20 were confirmed.

  When a pipe joint having the clearance a of 0.12 mm and the depth b of 0.22 mm was used, the dimension c of the burr DP generated by the experiment was 0.21 mm, and the depth b + the clearance a It was confirmed that it was well within the value (0.34 mm), and it was confirmed that there was no abnormality such as defective insertion or defective pulling in the coupling and separation operations of both couplings 10 and 20.

  In the second experiment, pipe joints with different depth ratios (depth b of the recess 14b / diameter of the ball 17 in%) ranging from 0% to 9% in 1% units are prepared. The process of applying the same impact pressure to each pipe joint is repeated, and the number of processes (endurance number) immediately before an abnormality such as an insertion failure or withdrawal failure occurs in the coupling and separation operations of both couplings 10 and 20 is confirmed. did.

  FIG. 5 shows the experimental results, and as can be seen from the figure, it can be confirmed that the durability number of 1 million times to 2 million times can be obtained when the recess depth ratio is in the range of 1% to 7%. It has been confirmed that the durability frequency is significantly reduced when the recess depth ratio is less than 1%. According to the experimental results, even when the depth ratio of the recess exceeds 7%, a durability of 1 million times or more was obtained. (1) When the depth b of the recess 14b is larger than 7%, the tapered portion of the hole 14a The depth x of 14a1 may decrease, and the ball 17 may fall off to the inner surface side of the third sleeve 14. (2) If the depth b of the recess 14b is greater than 7%, the depth y of the hole 14a (Thickness of the hole portion of the third sleeve 14) is reduced and the strength is reduced. (3) When the depth b of the recess 14b is larger than 7%, the ball 17 has a corner of the tapered portion 14a1 of the hole 14a. Since the taper portion 14a1 is greatly deformed because it comes into contact with the (inward end), damage such as cracks is likely to occur, and the ball 17 is prevented from moving outwardly on the inner surface of the taper portion 14a1 and the hole 14a. Burr occurs and the ball 17 moves There can be lowered, the upper limit of the consideration of the recess depth ratio etc. 7% is preferred.

[Second Embodiment]
6A and 6B show a second embodiment of the present invention (pipe joint). FIG. 6A is a view corresponding to FIG. 2A, and FIG. 6B is a view of the male coupling 20 from FIG. FIG. 6 is a view in which a sleeve 21 and a ball 17 are excluded. In the following description, FIG. 1 and the names and symbols used in the description are cited, and the left in FIG. 6A is described as the front and the right as the rear.

  The pipe joint of the second embodiment is different from the pipe joint shown in FIG. 1 in that each of the pipe joints provided on the third sleeve 14 of the female coupling 10 as shown in FIGS. 6 (A) and 6 (B). A recess 14c for increasing the exposed area on the inner side of the ball 17 is provided on the entire periphery (in the range of 360 degrees) including the front and rear peripheral edges on the peripheral edge of the inner opening of the hole 14a. Incidentally, the symbol y in FIG. 6B indicates the depth of the hole 14a, and the symbol x indicates the depth of the tapered portion 14a1.

  The recess 14c may be provided for each hole 14a, but may be provided as a common hole by forming an annular recess on the inner surface of the third sleeve 14 as illustrated. The depth b of the recess 14c is preferably set within a range of 1% to 7% of the diameter of the ball 17. If the depth b of the recess 14 c is less than 1% of the diameter of the ball 17, it will be difficult to obtain the following effects. If the depth b exceeds 7% of the diameter of the ball 17, the third sleeve of the female coupling 10 will be obtained. 14 may decrease in strength.

  Since the pipe joint of the second embodiment is also used for connecting a fluid pipe for circulating hydraulic fluid etc., as in the conventional pipe joint shown in FIG. 1, the main cause of the fluid pressure change in the pipe joint As in the case shown in FIG. 4, the burrs DP are generated inward at the rear side portion of the periphery of the inner opening of each hole 14a.

  However, in the pipe joint according to the second embodiment, the inner exposed area of the ball 17 is increased at the periphery of the inner opening of each hole 14 a provided in the third sleeve 14 of the female coupling 10. A recess 14c is provided at a predetermined depth b, and a predetermined clearance a is provided between the inner surface of the third sleeve 14 of the female coupling 10 and the outer surface of the sleeve 21 of the male coupling 20. Therefore, the distance until the burr DP reaches the sleeve 21 of the male coupling 20 can be secured by the value of the depth b + the clearance a.

  The depth b is determined in consideration of the clearance a and the dimension c of the burr DP that can occur in normal use. Therefore, even if the burr DP occurs in the normal use range, When the front part is pulled out from the inside of the female coupling 10, the burr DP is not caught by the outer surface of the sleeve 21 of the male coupling 20 and cannot be removed. When the portion is inserted from the rear side of the female coupling 10 to the inside thereof, the burr DP is not caught by the outer surface of the sleeve 21 of the male coupling 20 and cannot be inserted.

  Further, since the recess 14c is entirely provided at a predetermined depth b at the periphery of the inner opening of each hole 14a, a burr DP is generated at the front portion of the periphery of the inner opening of each hole 14a. Even in this case, the same effect as described above can be obtained.

  As described above, in the first embodiment and the second embodiment described above, the ball 17 is rotatably disposed in each of the plurality of holes 14 a provided in the third sleeve 14 of the female coupling 10. Instead, the couplings 10 and 20 are coupled by the engagement between the cylindrical roller and the annular recess 21a using a cylindrical roller and using a cylindrical roller that can be rotatably arranged as a hole shape. Even in this case, the same effect as described above can be obtained if a recess for increasing the exposed area on the inner side of the cylindrical roller is provided in the periphery of the inner opening of the hole.

  In the first and second embodiments described above, an annular recess 21a is provided at a predetermined position on the outer surface of the sleeve 21 of the male coupling 20 so that the inwardly exposed portion of each ball 17 can be engaged. However, when the orientation of the male coupling 20 with respect to the female coupling 10 is determined at the time of coupling and separation, the sleeve 21 of the male coupling 20 is arranged so that a plurality of recesses correspond to the respective holes 14a instead of the annular recess 21a. You may provide an outer surface in the circumferential direction at intervals.

The partially fractured side view of a state in which the female coupling and the male coupling are coupled, showing a conventional pipe joint that utilizes the engagement between a rolling element such as a ball and a recess for coupling the female coupling and the male coupling. FIG. 2A is an enlarged view of a portion A in FIG. 1, and FIG. 2B is a diagram corresponding to FIG. FIG. 3A shows a first embodiment of the present invention, FIG. 3A is a view corresponding to FIG. 2A, and FIG. 3B is a view in which a male coupling sleeve and ball are removed from FIG. is there. It is explanatory drawing of the effect which concerns on the pipe joint of 1st Embodiment. It is a figure which shows the experimental result of durability count confirmation which concerns on the pipe joint of 1st Embodiment. FIG. 6A shows a second embodiment of the present invention, FIG. 6A is a view corresponding to FIG. 2A, and FIG. 6B is a view in which a male coupling sleeve and ball are excluded from FIG. 6A. is there.

Explanation of symbols

10 ... female coupling 11 ... first sleeves, 12 ... second sleeves, 13 ... first spring member, 14 ... third sleeves, 14a ... hole, 14b, 14c ... recess, 15 ... operation sleeve, 16 ... second spring member, 17 ... ball, 18 ... stopper ring, 20 ... male coupling, 21 ... sleeves, 21a ... annular recess.

Claims (4)

It includes a bond and capable and female coupling and male coupling separation, the pipe joint using the engagement between the rolling element and the recess of the ball such as the coupling of both coupling
Wherein the sleeve of the female coupling, the hole for the rolling element arrangement, part of the rolling element disposed rotatably within the hole is provided so as to be exposed from the inner side opening of the hole,
Wherein the male coupling sleeve, inwardly exposed parts of the rolling elements are found provided with engageable the recess,
Recess for the rim of the inner side opening to increase the inner side exposed area of the rolling element of said holes are provided at a predetermined depth,
The depth of the recess is in the range of 1-7% of the rolling element diameter,
A pipe joint characterized by that. The recess is locally provided on the periphery of the inner opening of the hole,
The pipe joint according to claim 1. The recess is generally provided at the periphery of the inner opening of the hole,
The pipe joint according to claim 1. If the direction of inserting the male coupling sleeve into the female coupling sleeve is the front when the female coupling and the male coupling are coupled, the local opening of the inner opening of the hole is defined. The rear part of the periphery,
The pipe joint according to claim 2 characterized by things.

Images