JP4828381B2 - Fitting - Google Patents

Description

  The present invention relates to a joint comprising a male nose and a female body provided with a flow path portion through which a fluid flows, and joined by inserting the nose into a concave insertion portion of the body.

  2. Description of the Related Art Conventionally, a joint including a male nose and a female body having a flow path portion through which a fluid flows has been used. Then, by joining the nose and the body, one tubular body connected to the nose and the other tubular body connected to the body are extended, and a joint is connected to the one tubular body and the other tubular body. The fluid is transferred.

In such a joint, a sleeve is provided in the concave insertion portion of the body, and a plurality of steel balls are held by the sleeve. The sleeve is held by the body by a retaining ring so that the sleeve does not come off the body. When the nose is inserted into the concave insertion portion of the body, the plurality of steel balls are fitted into the groove portions of the nose. As a result, the nose is prevented from coming out of the concave insertion portion, and a plurality of steel balls are arranged to form a bearing structure in which the nose and the body can rotate (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-344184

  However, in a state where the nose is inserted and coupled to the concave insertion portion of the body, the sleeve, the retaining ring, and the steel ball rotate. Due to the rotation, the retaining ring is worn, and the sleeve cannot be held, and the retaining ring or the sleeve may come off. In addition, foreign matter such as earth and sand may enter between the body and the sleeve from the outside of the joint, and wear of the retaining ring and the sleeve may be promoted.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint capable of suppressing a retaining ring and a sleeve from being pulled out due to wear.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a nose connected to one pipe and a body having a concave insertion part connected to the other pipe and into which the nose is inserted. A plurality of balls fitted into the recesses on the outer peripheral surface of the nose ; and the concave curved surface formed on the tip portion and formed on the tip portion, and the recesses; and , upon insertion of the nose into the concave insertion portions, thereby preventing disengagement of the ball is located on the insertion port side of the from the ball body, the concave with fitted the nose the ball into the recess a sleeve which is held in the insertion portion, by being locked to a groove provided in the wall of the a groove formed in the sleeve concave insertion portions, anti-disengagement from the concave insertion portion of the sleeve A retaining ring which is interposed in a compressed state between the inner wall portion of the front end portion of the sleeve the concave insertion portions, said sleeve pressing said sleeve to said retaining ring around the axis of the retaining ring And a rotation suppressing member that suppresses rotation.

According to the first aspect of the present invention, the plurality of balls are fitted in the recesses on the outer peripheral surface of the nose, and the sleeve is extrapolated to the nose. When the ball is sandwiched between the concave curved surface formed at the tip of the sleeve and the concave portion of the nose , and when the nose is inserted into the concave insertion portion , the sleeve is arranged closer to the insertion port of the body than the ball. In addition to preventing the ball from coming off, the sleeve is held in the concave insertion portion together with the nose in which the ball is fitted in the concave portion. Further, the retaining ring is locked to the groove formed in the sleeve and the groove provided in the wall portion of the concave insertion portion of the body, thereby preventing the sleeve from coming off from the concave insertion portion. At that time, the rotation suppression member is inserted in a compressed state between the distal end portion of the sleeve and the back wall portion of the concave insertion portion , and the sleeve is pressed against the retaining ring, whereby the shaft of the sleeve and the retaining ring is inserted. Around rotation is suppressed. For this reason, wear of the retaining ring and the sleeve is suppressed, and removal from the concave insertion portion such as the retaining ring and the sleeve is suppressed.

According to a second aspect of the present invention, in the joint according to the first aspect, the rotation suppressing member is a spring that contacts a distal end portion of the sleeve and a back wall portion of the concave insertion portion. .

According to the invention described in claim 2, the spring is inserted so as to contact the distal end portion of the sleeve and the inner wall portion of the concave insertion portion, and the sleeve is pressed against the retaining ring by the reaction force of the spring, The rotation of the sleeve and the retaining ring around the shaft is suppressed. As a result, wear of the retaining ring and the sleeve is suppressed, and removal from the concave insertion portion such as the retaining ring and the sleeve is suppressed.

According to a third aspect of the present invention, in the joint according to the first aspect, the rotation suppressing member is a ring-shaped rubber member that comes into contact with the distal end portion of the sleeve and the inner wall portion of the concave insertion portion. It is characterized by.

According to the third aspect of the present invention, the ring-shaped rubber member is inserted so as to contact the distal end portion of the sleeve and the inner wall portion of the concave insertion portion, and the sleeve is pressed against the retaining ring by the rubber member. Thus, the rotation of the sleeve and the retaining ring around the shaft is suppressed. For this reason, wear of the retaining ring and the sleeve is suppressed, and removal from the concave insertion portion such as the retaining ring and the sleeve is suppressed.

The invention according to claim 4 is a joint including a nose connected to one pipe and a body connected to the other pipe and having a concave insertion portion into which the nose is inserted, A plurality of balls fitted in the recesses on the outer peripheral surface of the outer peripheral surface, the concave curved surface formed at the tip portion and inserted into the nose, and the concave portion sandwiching the balls, and the nose into the concave insertion portion When inserted, the sleeve is disposed closer to the insertion port of the body than the ball to prevent the ball from coming off, and the sleeve is held by the concave insertion portion together with the nose fitted in the concave portion, by being engaged with a groove provided in the wall of the sleeve in a groove formed the concave insertion portions, and a retaining ring to prevent disengagement from the concave insertion portion of the sleeve, the sleeve Interposed between the outer peripheral surface formed circumferential groove and the recessed insertion portion inner peripheral surface of the insertion port side of the ball in, contact with the inner peripheral surface of the a circumferential groove recessed insertion portion of the sleeve And a rubber ring- like rotation suppressing member that suppresses the rotation of the sleeve and the retaining ring around the shaft by friction .

According to the fourth aspect of the present invention, the rubber ring- shaped rotation suppressing member is inserted between the circumferential groove formed on the outer circumferential surface of the sleeve and the inner circumferential surface on the insertion port side from the ball in the concave insertion portion . The rotation of the sleeve and the retaining ring around the shaft is suppressed by the rubber ring-shaped rotation suppressing member . For this reason, wear of the retaining ring and the sleeve is suppressed, and removal from the concave insertion portion such as the retaining ring and the sleeve is suppressed.

Further, since the rubber ring-shaped rotation suppressing member is provided at the insertion port of the concave insertion portion, foreign matter such as earth and sand is prevented from entering between the concave insertion portion and the sleeve from the outside of the joint. It is possible to extend the life of the joint.

  In the joint according to the present invention, when the nose is coupled to the concave insertion portion of the body, wear of the retaining ring and the sleeve is suppressed, and the removal from the concave insertion portion of the body such as the retaining ring and the sleeve can be suppressed. .

  Hereinafter, embodiments of the joint of the present invention will be described with reference to the drawings.

  FIG. 1 is a half cut sectional view showing a coupling state of a joint 10 according to the first embodiment of the present invention, and FIG. 2 is a half cut sectional view showing a separated state of the joint 10.

  The joint 10 includes a body 12 that is a female metal fitting and a nose 30 that is a male metal fitting. As shown in FIG. 2, the body 12 is formed with a cylindrical concave insertion portion 14 into which the nose 30 is inserted. A circumferential groove 16 in which a retaining ring 42 is locked is formed on the inner peripheral wall of the concave insertion portion 14 on the insertion opening 14A side. A large-diameter portion 17 having the same diameter is formed on the inner peripheral wall on the back side from the circumferential groove 16 of the concave insertion portion 14, and the back side from the large-diameter portion 17 has a small diameter via a step portion 18. It is configured. A spring 26 is inserted into the large diameter portion 17, and one end portion of the spring 26 is in contact with the stepped portion 18.

  A circumferential groove 19 is formed on the inner circumferential wall on the back side of the stepped portion 18, and a backup ring 28 is disposed in the circumferential groove 19, and an O-ring 29 is disposed on the far side. Furthermore, a stopper portion 20 with which the tip end portion 32 of the nose 30 abuts is formed at the innermost portion of the concave insertion portion 14. In addition, a channel portion 22 is formed in the core portion of the body 12 so as to communicate with the concave insertion portion 14 and through which a fluid flows. A male screw 24 for connecting another pipe (not shown) is formed on the opposite side of the body 12 from the insertion port 14A.

  As shown in FIGS. 2 and 3, the nose 30 has a smaller diameter as it goes to the distal end portion 32, and a large diameter portion 33 having substantially the same diameter is formed closer to the central portion than the distal end portion 32. A recess 34 in which a plurality of balls 38 are arranged is formed in the circumferential direction. On both sides of the concave portion 34 in the axial direction, curved surfaces with which the peripheral surface of the ball 38 can abut are formed. A hexagonal portion 35 that protrudes in the radial direction and can be hooked with a spanner is provided at the center of the nose 30. A flow path portion 36 through which a fluid flows is formed in the core portion of the nose 30.

  A male screw 37 for connecting another pipe (not shown) is formed on the side of the nose 30 opposite to the tip 32. An O-ring 44 is externally inserted between the hexagonal portion 35 of the nose 30 and the male screw 37.

  On the outer peripheral surface of the large diameter portion 33 of the nose 30, a sleeve 40 for preventing the plurality of balls 38 from coming out of the concave insertion portion 14 is extrapolated. A concave curved surface 40B with which the circumferential surface of the ball 38 abuts is formed at the distal end portion 40A of the sleeve 40. A circumferential groove 41 is formed on the outer circumferential surface of the sleeve 40, and a retaining ring 42 is disposed in the circumferential groove 41. The retaining ring 42 is formed by bending a wire into a circular shape and making both ends free, and can be expanded and contracted in the radial direction. The inner diameter of the retaining ring 42 is smaller than the outer diameter of the sleeve 40, the outer diameter of the retaining ring 42 is formed larger than the outer diameter of the sleeve 40, and the outer peripheral side of the retaining ring 42 protrudes from the circumferential groove 41. That is, the inner peripheral side of the retaining ring 42 is configured to be engaged with the circumferential groove 41. Further, the outer diameter of the retaining ring 42 is formed to be substantially the same as the inner diameter of the circumferential groove 16 of the body 12, and is larger than the inner diameter of the insertion port 14 </ b> A of the body 12. The sleeve 40 is made of metal or resin, the retaining ring 42 is made of metal, and the ball 38 is made of metal (steel ball).

  When such a joint 10 joins the nose 30 and the body 12, the nose 30 is inserted into the concave insertion portion 14 of the body 12 from the state shown in FIG. Then, the circumferential surface of the retaining ring 42 disposed in the circumferential groove 41 of the sleeve 40 hits the insertion port 14A of the body 12, and when the nose 30 is further inserted, the retaining ring 42 is reduced in diameter and enters the concave insertion portion 14. Then, as shown in FIG. 1, when the tip portion 32 of the nose 30 is inserted to a position near the stopper portion 20, the retaining ring 42 reaches the circumferential groove 16 of the body 12, and the retaining ring 42 expands in diameter. A part of the peripheral surface enters the peripheral groove 16.

  A part of the circumferential surface of the retaining ring 42 contacts the circumferential groove 16 of the body 12, and the opposite side of the circumferential surface of the retaining ring 42 contacts the circumferential groove 41 of the sleeve 40. That is, the sleeve 40 is locked to the circumferential groove 16 of the body 12 via the retaining ring 42, thereby preventing the sleeve 40 from coming out of the concave insertion portion 14. Further, since the plurality of balls 38 that are in contact with the concave curved surface 40B of the sleeve 40 enter the concave portion 34 of the nose 30, the nose 30 is prevented from coming out of the concave insertion portion 14. That is, the nose 30 is prevented from being detached from the concave insertion portion 14 by the retaining ring 42 via the sleeve 40. As a result, the nose 30 and the body 12 are connected to each other, and a fluid (for example, a liquid) can be passed through the flow path portions 22 and 36.

  At this time, the spring 26 is inserted between the stepped portion 18 in the concave insertion portion 14 of the body 12 and the distal end portion 40A of the sleeve 40, and the sleeve 40 is pressed against the retaining ring 42 by the reaction force of the spring 26. The retaining ring 42 is pressed against the circumferential groove 16 of the body 12. As a result, the rotational resistance of the body 12, the sleeve 40, and the retaining ring 42 becomes larger than the rotational resistance of the ball 38, and the body 12, the sleeve 40, and the retaining ring 42 are prevented from rotating around the axis. For this reason, the wear of the contact portion of the body 12, the sleeve 40 and the retaining ring 42 is suppressed, and the retaining ring 42 and the sleeve 40 are prevented from coming off.

  On the other hand, in the joint 100 of the comparative example shown in FIG. 6, no spring is inserted between the stepped portion 18 in the concave insertion portion 14 of the body 102 and the sleeve 40. In this joint 100, a plurality of balls 38 are arranged in a bearing structure so that the body 102 and the nose 104 can rotate. Accordingly, in this state, the sleeve 40, the retaining ring 42, and the ball 38 all rotate. In particular, when the retaining ring 42 rotates, the retaining ring 42 may be worn and the retaining ring 42 and the sleeve 40 may come off. Further, if foreign matter such as earth and sand enters between the body 102 and the nose 104 from the outside of the joint 100, wear of the retaining ring 42 and the like may be promoted.

  Next, the joint according to the second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 4, in the joint 60, a ring-shaped rubber member 62 is interposed between the stepped portion 18 in the concave insertion portion 14 of the body 12 and the sleeve 40 instead of the spring 26 shown in FIG. 1. It is inserted. As a material of the rubber member 62, for example, SBR, NBR, EPDM, silicone rubber, fluorine rubber, IIR (butyl rubber), natural rubber, or the like is used.

  In the joint 60, the rubber member 62 is inserted between the stepped portion 18 of the body 12 and the distal end portion 40 </ b> A of the sleeve 40 in a compressed state. For this reason, the sleeve 40 is pressed against the retaining ring 42 by the reaction force of the rubber member 62, and the retaining ring 42 is further pressed against the circumferential groove 16 of the body 12. Further, due to the friction of the rubber member 62, the rotational resistance of the body 12, the sleeve 40, and the retaining ring 42 becomes larger than the rotational resistance of the ball 38, and the body 12, the sleeve 40, and the retaining ring 42 are prevented from rotating around the axis. The For this reason, the wear of the contact portion of the body 12, the sleeve 40 and the retaining ring 42 is suppressed, and the retaining ring 42 and the sleeve 40 are prevented from coming off.

  Next, a joint according to a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, in this joint 70, a circumferential groove 74 is formed on the outer circumferential surface on the insertion port 14 </ b> A side with respect to the circumferential groove 41 of the sleeve 72, and an O-ring 76 is provided in the circumferential groove 74. ing. The insertion opening 14A of the body 12 is formed with a tapered surface 78 whose diameter is increased toward the distal end side at a position where the nose 30 comes into contact with the O-ring 76 when the nose 30 is inserted into the concave insertion portion 14.

  In this joint 70, when the nose 30 is inserted into the concave insertion portion 14 of the body 12, the O-ring 76 disposed in the circumferential groove 74 of the sleeve 72 contacts the tapered surface 78 of the body 12. For this reason, the rotational resistance of the body 12 and the sleeve 72 becomes larger than the rotational resistance of the ball 38 due to the friction and reaction force of the O-ring 76. As a result, the body 12, the sleeve 72, and the retaining ring 42 are prevented from rotating around the axis. For this reason, the wear of the contact portion of the body 12, the sleeve 72 and the retaining ring 42 is suppressed, and the retaining ring 42 and the sleeve 72 are prevented from coming off.

  Further, since the O-ring 76 is in close contact with the tapered surface 78 of the insertion opening 14 </ b> A of the body 12, it is possible to prevent foreign matters such as earth and sand from entering the body 12 and the sleeve 72 from the outside of the joint 70. It is possible to extend the service life.

  In the first to third embodiments, the spring, the rubber member, and the O-ring are provided as the rotation suppressing member. However, the rotation is not limited to this, and the rotation of the body, the sleeve, and the retaining ring around the shaft can be suppressed. Any other configuration may be used.

It is a half-cut sectional view which shows the joint state of the body and nose of the joint which concerns on 1st Embodiment of this invention. It is a half-cut sectional view showing the separated state of the body and nose of the joint according to the first embodiment of the present invention. It is a top view of the nose which concerns on 1st Embodiment of this invention. It is a half-cut sectional view which shows the joint state of the body and nose of the joint which concerns on 2nd Embodiment of this invention. It is a half-cut sectional view which shows the joint state of the body and nose of the joint which concerns on 3rd Embodiment of this invention. It is a half-cut sectional view which shows the combined state of the body and nose of the joint of the comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint 12 Body 14 Concave insertion part 14A Insertion slot 16 Circumferential groove 18 Step part (back wall part)
22 channel portion 26 spring (rotation suppression member)
30 Nose 32 Tip 34 Recess 36 Channel 38 Ball 40 Sleeve 40A Tip 41 Circumferential Groove 42 Retaining Ring 60 Joint 62 Rubber Member (Rotation Suppression Member)
70 Joint 72 Sleeve 74 Circumferential groove 76 O-ring (Rotation suppressing member)

Claims (4)

A joint having a nose connected to one pipe and a body connected to the other pipe and having a concave insertion portion into which the nose is inserted,
A plurality of balls fitted into the recesses on the outer peripheral surface of the nose;
When the ball is sandwiched between the concave curved surface formed at the tip portion and formed at the tip portion and the concave portion, and the nose is inserted into the concave insertion portion, the insertion port side of the body from the ball together are arranged to prevent disengagement of the ball, a sleeve the ball is held in the concave insertion portions with fitted the nose into the recess,
A retaining ring that prevents the sleeve from coming off from the concave insertion portion by being locked to the groove formed in the sleeve and the groove provided in the wall portion of the concave insertion portion;
Rotation inserted between the distal end portion of the sleeve and the back wall portion of the concave insertion portion in a compressed state, pressing the sleeve against the retaining ring and suppressing rotation of the sleeve and the retaining ring about the axis. A restraining member;
A joint characterized by comprising: The joint according to claim 1, wherein the rotation suppressing member is a spring that contacts a distal end portion of the sleeve and a back wall portion of the concave insertion portion. The joint according to claim 1, wherein the rotation suppressing member is a ring-shaped rubber member that comes into contact with a distal end portion of the sleeve and a back wall portion of the concave insertion portion. A joint having a nose connected to one pipe and a body connected to the other pipe and having a concave insertion portion into which the nose is inserted,
A plurality of balls fitted into the recesses on the outer peripheral surface of the nose;
When the ball is sandwiched between the concave curved surface formed at the tip portion and formed at the tip portion and the concave portion, and the nose is inserted into the concave insertion portion, the insertion port side of the body from the ball A sleeve which is disposed on the concave insertion portion to prevent the ball from coming off, and the ball is held in the concave insertion portion together with the nose fitted in the concave portion,
A retaining ring that prevents the sleeve from coming off from the concave insertion portion by being locked to the groove formed in the sleeve and the groove provided in the wall portion of the concave insertion portion;
The circumferential groove formed on the outer circumferential surface of the sleeve and the inner circumferential surface on the insertion port side of the ball in the concave insertion portion, and the circumferential groove of the sleeve and the inner circumferential surface of the concave insertion portion A rubber ring- shaped rotation restraining member that restrains rotation of the sleeve and the retaining ring around the shaft by friction ,
A joint characterized by comprising:

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