JP2006090368A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost while preventing occurrence of fluid leakage by securing vibration resistance, durability and corrosion resistance in a pipe joint for coupling a nose having a protruded flow passage to a body having a recessed coupling part. <P>SOLUTION: A recessed coupling part 34 into which a protruded flow passage 16 of a nose body 14 is inserted is formed in a synthetic resin-made main body 32. A gasket 38 is inserted into the recessed coupling part 34. A guide washer 44 is inserted into the insertion port 42 side of the gasket 38. A guide washer 46 fitted to the inside of the guide washer 44 so as to form a recess 44A. A seal member 48 is fixed onto the recess 44A. When the protruded flow passage 16 of the nose body 14 is inserted into the recessed coupling part 34 of the main body 32, the protruded flow passage 16 is sealed by the gasket 38 and the seal member 48. While vibrations acting on a pipe joint 10 is dispersed to the gasket 38 and the seal member 48 to prevent abrasion, therefor, the deterioration of sealing property caused by a fall, torsion or the like of the seal member 48 can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint that is used for fuel supply of an outboard motor and the like, and includes a male nose and a female body provided with a flow path portion and a fixed portion separately.

  Conventionally, pipe joints for connecting to engine-side pipes have been used for connecting parts of hoses and pipes for fuel supply of outboard motors, for example, connecting parts of hoses extending from the fuel tank side of motor boats. ing.

  As such a pipe joint, for example, as shown in FIG. 6, a pipe joint 100 including a nose 102 which is a male metal fitting and a body 120 which is a female metal fitting is used. The nose 102 is provided with a metal convex flow passage 104 through which fuel flows so as to protrude from the nose body 106, and a convex fixing portion 108 is provided separately from the convex flow passage 104. Yes.

  As shown in FIG. 7, a rubber gasket 112 is held in the recess 110 of the nose body 106. The gasket 112 is in contact with the root portion 104 </ b> A of the convex channel portion 104 inserted into the concave portion 110. Further, a groove 114 is formed on the inlet 110A side of the recess 110, and a metal lock ring 116 is fitted into the groove 114. The lock ring 116 is a C-shaped ring with a part cut away, and the convex channel portion 104 is fixed in the concave portion 110 by being fitted into the groove portion 114 using elastic force.

  On the other hand, as shown in FIG. 6, the body 120 has a concave connecting portion 122 into which the convex flow passage portion 104 is inserted and a convex fixing portion 108 inserted into the joint surface of the body main body 126 with the nose 102. And a concave insertion portion 124. As shown in FIG. 7, a rubber gasket 128 is held in the concave coupling portion 122 of the body main body 126. The ball 136 is in contact with the concave coupling portion 122 side (back side) from the gasket 128 and is urged toward the gasket 128 by a spring 138. Further, a guide washer 130 is inserted on the insertion port 122 </ b> A side of the concave connecting portion 122 so as to abut on the gasket 128. Further, a groove 132 is formed in the insertion port 122A, and a metal lock ring 134 is fitted into the groove 132. The lock ring 134 is a C-shaped ring, and the gasket 128 is fixed in the concave connection portion 122 by being fitted into the groove portion 132 using an elastic force.

When the nose 102 and the body 120 are joined, as shown in FIG. 8, the convex flow passage portion 104 of the nose 102 is connected to the concave connection portion 122 of the body 120, and the convex fixing portion 108 of the nose 102 is connected to the concave insertion portion of the body 120. 124 are inserted simultaneously. Then, the nose 102 and the body 120 are coupled by locking the groove 108 </ b> A of the convex fixing portion 108 with the lock member 140. Thereby, the convex flow path part 104 and the concave connection part 122 of the pipe joint 100 communicate, and a fuel can be supplied now to an engine (for example, refer patent document 1).
Japanese Patent Laid-Open No. 11-030367

  In the pipe joint 100 as described above, when the nose 102 and the body 120 are joined, the surface of the convex flow path portion 104 on the nose 102 side and the gasket 128 on the body 120 side are sealed. However, in this pipe joint 100, the vibration concentrates on the gasket 128 due to the vibration of the engine, the gasket 128 rubs and wears against the surface of the convex flow path portion 104, and fuel leakage occurs. In order to extend the life of the pipe joint 100, the convex channel portion 104 is made of metal to ensure vibration resistance and durability. However, there is a problem that the cost increases and the corrosion resistance is lacking. is there.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a pipe joint that ensures vibration resistance, durability, and corrosion resistance to prevent occurrence of fluid leakage and can reduce costs. And

  The invention according to claim 1 is a nose having a convex channel portion protruding from a nose body to which a fluid is supplied, and a concave connection portion in which the convex channel portion is inserted into a body body from which the fluid is discharged. A pipe joint that is inserted into the concave coupling portion, and the convex channel portion and the concave coupling portion when the convex channel portion is inserted into the concave coupling portion. A first sealing member that seals, a guide member that is inserted closer to the insertion port than the first sealing member in the concave coupling portion, and an annular concave portion formed in the guide member, the convex shape It has a flow path part and the 2nd rubber-made sealing member which seals the said concave connection part, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, the nose and the body are connected by inserting the convex channel portion of the nose body to which the fluid is supplied into the concave connection portion of the body body from which the fluid is discharged. A first seal member is inserted in the concave connection portion of the body body, and the convex flow path portion and the concave connection portion are sealed by the first seal member. Further, a guide member is inserted closer to the insertion port than the first seal member in the concave coupling portion, and a second seal member made of rubber is fixed in an annular concave portion of the guide member. The concave connecting portion is sealed with the second seal member. Thereby, since the convex flow path portion is held by the first seal member and the second seal member, the force acting during vibration of the pipe joint is dispersed, and wear of the first seal member and the second seal member is reduced. Is done. Further, since the second seal member is fixed in the recess, the second seal member is prevented from falling off and twisting, and the holding force and the sealing force of the convex flow path portion are prevented from being lowered. For this reason, the occurrence of fluid leakage can be prevented, and a pipe joint excellent in vibration resistance and durability can be realized.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the second seal member is characterized in that raw rubber before vulcanization flows into the recess and is fixed by vulcanization. .

  In the second aspect of the present invention, the raw rubber before vulcanization flows into the recess formed in the guide member, and the second seal member is formed by fixing in the recess by vulcanization. As a result, the second seal member is prevented from falling off and twisting, and the holding force and sealing force of the convex flow path portion are prevented from being reduced.

  According to a third aspect of the present invention, in the configuration of the first aspect, the second seal member is formed by placing a pre-molded rubber material in a mold and melting a synthetic resin material that forms the guide member. The second sealing member is fixed to the recess by pouring and solidifying.

  In the invention according to claim 3, the rubber material constituting the second seal member is molded in advance and placed in the mold, and the synthetic resin material forming the guide member is melted and poured, and solidified. The second seal member is fixed. As a result, the second seal member is prevented from falling off and twisting, and the holding force and sealing force of the convex flow path portion are prevented from being reduced.

  According to a fourth aspect of the present invention, in the configuration of the first aspect, the second seal member is characterized in that a rubber material molded in advance in the recess is fixed by adhesion.

  In a fourth aspect of the invention, the second seal member is formed by adhering a rubber material to the recess formed in the guide member by adhesion. As a result, the second seal member is prevented from falling off and twisting, and the holding force and sealing force of the convex flow path portion are prevented from being reduced.

  According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the guide member has a ring-shaped first structure that forms one groove wall and a bottom wall of the recess. 1 guide member and the 2nd guide member which comprises the other groove wall of the said recessed part engage | inserted by the said 1st guide member are characterized by the above-mentioned.

  In the fifth aspect of the present invention, the concave portion is formed by combining the second guide member with the ring-shaped first guide member constituting one groove wall and the bottom wall of the concave portion. By using two members in this manner, the guide member can be easily molded, and productivity is improved.

  A sixth aspect of the invention is characterized in that, in the configuration of any one of the first to fifth aspects, the convex flow path portion is made of a synthetic resin.

  In the invention according to claim 6, since the convex flow path portion is made of a synthetic resin, it is excellent in corrosion resistance and cost can be reduced as compared with the case where it is made of metal.

  In the pipe joint according to the present invention, since the sealing performance is ensured by the convex flow passage portion on the nose side and the first seal member and the second seal member on the body side, vibration resistance and durability are improved, and fluid leakage Can be prevented. Further, by using a synthetic resin for the convex flow path portion, corrosion resistance can be improved and cost can be reduced.

  Hereinafter, the best embodiment of the pipe joint of the present invention will be described with reference to the drawings.

  FIG. 1 is a half sectional view showing a pipe joint 10 according to an embodiment of the present invention.

  The pipe joint 10 includes a nose 12 that is a male metal fitting and a body 30 that is a female metal fitting. The nose 12 has a convex flow channel portion 16 made of a synthetic resin protruding from the coupling surface of the nose main body 14 and a metal convex fixing portion 18 protruding from a position different from the convex flow channel portion 16. Is provided. In the body 30, a concave connecting portion 34 into which the convex flow passage portion 16 is inserted and a concave insertion portion 36 into which the convex fixing portion 18 is inserted on the joint surface of the body body 32 made of synthetic resin with the nose 12. And are provided. The pipe joint 10 is used for fuel supply to an outboard motor. A connection pipe 14A of the nose body 14 is connected to a fuel supply pipe (not shown) side, and an engine side pipe pipe (not shown) is connected. The connecting pipe 32A of the body main body 32 is connected.

  As shown in FIG. 2, a rubber gasket 22 is fitted into the concave portion 20 formed in the synthetic resin nose body 14, and the convex portion 22 </ b> A of the gasket 22 is engaged with the groove portion 21 in the concave portion 20. ing. A valve check 23 is provided at a substantially central portion of the concave portion 20 so as to be able to advance and retreat, and a rod-like support portion 24 is erected on the valve check 23. By inserting the opening 16 </ b> B of the convex flow passage portion 16 into the support portion 24, the root portion 16 </ b> A of the convex flow passage portion 16 contacts the gasket 22. A spring 25 is disposed behind the valve check 23, and the valve check 23 and the support portion 24 are integrally movable within the nose body 14.

  In addition, the concave portion 20 is formed with a holding portion 20A that comes into contact with the outer periphery of the root portion 16A, and is a stepped portion 20C having an enlarged diameter on the insertion port 20B side of the holding portion 20A. A synthetic resin ring member 26 is fitted on the insertion port 20B side of the convex flow path portion 16 of the concave portion 20. The ring member 26 is formed such that the outer diameter is larger than the outer periphery of the root portion 16A of the convex flow path portion 16 and the inner diameter is smaller than the outer periphery of the root portion 16A. While being in contact with 20C, the peripheral surface of the ring member 26 is in contact with the insertion port 20B. That is, the convex channel portion 16 and the gasket 22 are sandwiched between the concave portions 20 by bringing the ring member 26 into contact with the step portion 20 </ b> C. The ring member 26 and the nose body 14 are made of a synthetic resin such as polybutylene terephthalate (PBT), and the contact surface with the stepped portion 20C of the ring member 26 is welded, so that the convex channel portion 16 becomes the concave portion 20. Fixed inside. For welding, for example, ultrasonic welding or the like is used.

  As shown in FIG. 2, a holding portion 40 into which a rubber gasket 38 is inserted is formed in the concave connection portion 34 of the body body 32, and the convex portion 38 </ b> A of the gasket 38 is formed in the groove portion 40 </ b> A of the holding portion 40. Engaged and held. Further, the diameter of the holding portion 40 on the side of the insertion opening 42 is increased to form a stepped portion 42A.

  A synthetic resin guide washer 44 is fitted into the insertion port 42 so as to contact the gasket 38. The guide washer 44 is formed in a ring shape, and an annular recess 44A is formed by fitting a ring-shaped guide sub-washer 46 on the inner peripheral surface on the guide washer 44 side. As shown in FIG. 4, a rubber seal member 48 is fixed to the recess 44A. Examples of the material of the seal member 48 include diene rubbers such as NBR (butadiene-acrylonitrile copolymer) and SBR (butadiene-styrene copolymer), EPM (ethylene-propylene copolymer), and EPDM (ethylene. -Propylene-diene terpolymer), non-diene rubbers such as fluorine rubber and silicone rubber are used.

  In order to fix the seal member 48 in the recess 44A, a guide sub washer 46 is fitted inside the guide washer 44, and then raw rubber is poured into the recess 44A along a molding die (not shown) to vulcanize the raw rubber. By doing so, the rubber seal member 48 can be fixed to the recess 44A. Also, the raw rubber is poured into the guide washer 44 along a molding die (not shown), and the guide sub washer 46 is fitted inside the guide washer 44 after the vulcanization process, whereby the seal member 48 is fixed to the recess 44A. Alternatively, an integral part may be formed.

  As another method, a ring-shaped seal member 48 molded in advance is placed in a molding die (not shown), the resin material of the guide washer 44 is poured outside the seal member 48, and the resin is solidified to solidify the seal member. A guide washer 44 to which 48 is fixed is formed. By fitting the guide sub-washer 46 inside the guide washer 44, an integrated part in which the seal member 48 is fixed to the recess 44A is completed. Further, by forming a rotation stop on the guide sub washer 46, the guide washer 44 and the guide sub washer 46 are integrated, and the guide sub washer 46 can be prevented from falling off.

  Further, the fixing of the seal member 48 to the guide washer 44 is not limited to such a method, and the seal member 48 formed in advance is formed in the recess 44A with a rubber adhesive such as diene rubber or non-diene rubber. It may be a method of adhering to.

  The guide washer 44 has a ring shape, and has an outer diameter larger than the outer periphery of the gasket 38 and an inner diameter smaller than the outer periphery of the gasket 38 at the contact surface with the gasket 38. The guide washer 44 is inserted into the insertion port 42 of the body main body 32 in a state where the seal member 48 is fixed, and the back side surface of the guide washer 44 is in contact with the stepped portion 42 A of the body main body 32. That is, the gasket 38 is sandwiched between the holding portion 40 and the guide washer 44. Further, a ball 50 is disposed on the back side of the gasket 38, and the ball 50 is urged toward the gasket 38 by a spring 52.

  The guide washer 44 and the holding portion 40 (body main body 32) are made of synthetic resin such as polybutylene terephthalate (PBT), and the contact surface with the stepped portion 42A of the guide washer 44 is welded, so that the gasket 38 becomes the body main body 32. It is fixed to the concave connecting portion 34. For welding, for example, ultrasonic welding or the like is used.

  As shown in FIG. 1, the concave insertion portion 36 is provided with a lock claw 54 attached to a leaf spring (not shown), and the lock claw 54 bites into the groove portion 18 </ b> A formed in the convex fixing portion 18. Thus, the convex fixing portion 18 is locked. The lock claw 54 is connected to a release lever 56 exposed to the body main body 32 via a leaf spring (not shown), and when the release lever 56 is pressed, the biting of the lock claw 54 into the groove 18A is released. It is configured as follows.

  Next, the effect | action of the pipe joint 10 of this embodiment is demonstrated.

  As shown in FIG. 3, the convex channel portion 16 of the nose 12 is inserted into the concave coupling portion 34 of the body 30 and the convex fixing portion 18 of the nose 12 is inserted into the concave insertion portion 36 of the body 30 at the same time. As a result, the convex flow passage portion 16 is inserted into the back side of the concave coupling portion 34 against the urging force of the spring 52. At the same time, when the lock claw 54 rides on the tip slope of the convex fixing portion 18 and reaches the coupling completion position, the lock claw 54 bites into the groove portion 18A of the convex fixing portion 18 by elastic force, and the nose 12 and the body 30 are moved. Combined. At this time, the tip of the ring member 26 is fitted into the insertion port 42 of the body main body 32. Since the convex fixing portion 18 is locked by the locking claw 54, the convex fixing portion 18 and the convex flow passage portion 16 are prevented from being detached from the body main body 32. In this state, the convex flow path portion 16 communicates with the concave coupling portion 34, and fuel can be supplied to the engine by a fuel supply system such as an outboard motor.

  At this time, the convex flow channel portion 16 made of synthetic resin is sealed by the gasket 38 and the seal member 48 in the concave connection portion 34 and is held at two points. Thereby, the vibration of the engine acting on the pipe joint 10 is dispersed, and the vibration does not concentrate on either the gasket 38 or the seal member 48.

  Further, as shown in FIG. 4, the seal member 48 is fixed in the recess 44 </ b> A of the guide washer 44. Therefore, as shown in FIG. 5, the seal member 48 does not drop off or twist compared to the configuration in which the O-ring 78 is fitted in the recess 44 </ b> A formed by the guide washer 44 and the guide sub-washer 46. Further, it is possible to prevent the holding force and the sealing performance of the convex channel portion 16 from being lowered. As a result, the occurrence of fuel leakage due to wear of the gasket 38 and the seal member 48 is prevented, and the pipe joint 10 having excellent vibration resistance and durability can be realized. Moreover, since the convex flow path part 16 made of a synthetic resin is used, the corrosion resistance is excellent and the cost can be reduced as compared with the case of a conventional metal.

  When releasing the coupling between the nose 12 and the body 30, when the release lever 56 is pressed, the lock claw 54 moves and the bite into the groove 18A is released. Thereby, the nose 12 can be pulled out from the body 30.

FIG. 1 is a half sectional view showing a pipe joint according to the first embodiment of the present invention. FIG. 2 is an exploded half sectional view showing the nose and body of the pipe joint according to the first embodiment of the present invention. FIG. 3 is a half sectional view showing a coupling state of the pipe joint according to the first embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a seal member used in the pipe joint shown in FIG. FIG. 5 is a partial cross-sectional view showing an example in which the O-ring is replaced with the seal member of the pipe joint shown in FIG. FIG. 6 is a half sectional view showing a conventional pipe joint. FIG. 7 is an exploded half sectional view showing a nose and body of a conventional pipe joint. FIG. 8 is a half cross-sectional view showing a coupling state of a conventional pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Nose 14 Nose main body 16A Root part 16 Convex flow path part 18A Groove part 18 Convex fixed part 20 Concave part 20B Insertion port 20C Step part 20A Holding part 21 Groove part 22 Gasket 26 Ring member 30 Body 32 Body main body 34 Concave shape Connecting part 36 Concave insertion part 38 Gasket (first seal member)
40 holding part 42 insertion slot 42A step part 44 guide washer 44A recessed part 46 guide sub washer 48 seal member (second seal member)
50 Ball 52 Spring 54 Lock claw 56 Release lever 78 O-ring

Claims (6)

A pipe joint comprising: a nose having a convex channel portion protruding from a nose body to which a fluid is supplied; and a body having a concave coupling portion into which the convex channel portion is inserted into the body body from which the fluid is discharged Because
A first seal member that is inserted into the concave connection portion and seals the convex flow passage portion and the concave connection portion when the convex flow passage portion is inserted into the concave connection portion;
A guide member inserted closer to the insertion port than the first seal member in the concave coupling portion;
A second seal member made of rubber that is fixed in an annular recess formed in the guide member and seals the convex flow passage portion and the concave coupling portion;
A pipe joint characterized by comprising:   2. The pipe joint according to claim 1, wherein the second seal member is made by allowing raw rubber before vulcanization to flow into the recess and fixing the rubber by vulcanization.   The second seal member has a pre-molded rubber material placed in a mold, and the synthetic resin material forming the guide member is melted and poured to solidify, thereby fixing the second seal member to the recess. The pipe joint according to claim 1, wherein   2. The pipe joint according to claim 1, wherein the second seal member is formed by adhering a pre-molded rubber material in the recess.   The guide member includes a ring-shaped first guide member that forms one groove wall and a bottom wall of the recess, and a second guide member that forms the other groove wall of the recess that is fitted into the first guide member. The pipe joint according to any one of claims 1 to 4, characterized by comprising:   The pipe joint according to any one of claims 1 to 5, wherein the convex flow path portion is made of a synthetic resin.

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