JP7357350B2 - pipe fittings - Google Patents

Description

The present invention relates to a pipe joint, and particularly to a pipe joint equipped with a lock ring that restricts the withdrawal of an inserted pipe body.

As this type of pipe joint, a technique described in Patent Document 1 below has been proposed. As shown in FIG. 6, this pipe joint 101 includes a joint main body 103 that has a stepped surface that contacts the innermost end of the pipe body at the inner deep side, and a cylinder that is assembled into the opening of the joint main body 103 by screw fastening. It includes a cap member 104 having a shape, and a lock ring 105 accommodated in a lock ring accommodating portion of the joint body 103. In this pipe joint 101, the pipe bodies 2A and 2B are inserted with the joint body 103 and the cap member 104 assembled together.

As shown in FIGS. 7(a) and 7(b), the lock ring 105 includes an annular flange 150 extending in the axial direction and an annular flange 150 formed by bending the end of the flange 150 toward the center. It includes a claw holding part 151 and a plurality of claws 152 bent and formed on the inner surface of the claw holding part 151. In addition, the two lock rings 105 are arranged side by side on the back side and the front side of the joint body 103, with the flange 150 touching the inner surface of the lock ring accommodating portion and the claws 152 extending further back toward the inner diameter. It is held between the locking surface of the ring accommodating portion and the pressing surface of the cap member 104 (see FIG. 6). When a pull-out force acts on the tubes 2A, 2B inserted into the pipe fitting 101, the claws 152 of the lock ring 105 bite into the outer surfaces of the tubes 2A, 2B, so that the tubes 2A, 2B are pulled out of the tube fitting 101. Withdrawals are regulated.

JP 2019-90503 Publication

However, the flange of the lock ring located on the back side is held and fixed between the flange of the lock ring on the front side and the locking surface of the lock ring housing part, so a pull-out force acts on the tube body. In some cases, not only the pawls in the lock ring but also the pawl holding portions themselves are deformed, resulting in insufficient biting of the pawls into the tubular body, and insufficient regulation of withdrawal of the tubular body.

Therefore, an object of the present invention is to provide a pipe joint that can sufficiently restrict the withdrawal of the pipe body.

The pipe joint of the present invention is a pipe joint for connecting pipe bodies, and is a cylindrical pipe joint that is provided with an opening into which the pipe body is inserted, and into which the pipe body is inserted into the inner side through the opening. A joint body, a cylindrical cap member assembled to the opening, an annular flange centered in the axial direction of the joint body, and formed by bending an end of the flange toward the center. each has an annular claw holding part and a plurality of claws formed on the inner surface of the claw holding part by bending in the axial direction, and the flange is radially inward than the inner surface of the joint body. a pair of lock rings that are housed side by side in the axial direction in the joint body with the claws extending toward the back side as the inner diameter increases, the lock rings being arranged on the back side of the joint body; a pair of lock rings including a lock ring and a front lock ring disposed on the front side of the joint body, the joint body locking the rear lock ring from the rear side; The cap member has a pressing surface that presses the front lock ring from the front side, and the pair of lock rings includes a locking surface of the joint body, a pressing surface of the cap member, and The claw is housed in a space surrounded by the inner surface of the joint body, and is configured such that the claws lock onto the outer circumferential surface of the inserted tube to restrict withdrawal of the tube, and the front The flange of the side lock ring, the pawl holding portion, and a pawl abutment ring housed in an annular space surrounded by the pawl, the pawl abutment ring being located on the near side of the pawl of the back lock ring. and has a claw abutting surface that abuts the claw from the front side when the claw of the back lock ring is deformed toward the front, and the claw of the back lock ring is closer to the claw contact surface than the claw of the back lock ring. The pawl abutment ring extends radially inward, and the pawl abutment ring is accommodated within the annular space in a state in which displacement in the radial direction is permitted.

According to this configuration, since the claw abutting surface is provided on the claw abutting ring, even if the claw of the rear lock ring is deformed toward the front side due to a pull-out force acting on the tubular body, this claw will remain intact. Contact the contact surface. At this time, since the pawl abutment ring is allowed to shift in the radial direction within the annular space, the pawl abutment ring is centered by contact with the pawl of the rear lock ring, and the pawl abutment ring is centered by contact with the pawl of the rear lock ring. The axis of the contact ring and the axis of the inserted tube are aligned. Therefore, each claw provided on the inner lock ring evenly contacts the claw contact surface. Then, as the tube body is pulled out further, the claws of the inner lock ring are aligned with the claw contacting surface of the claw contact ring, and the portion of the claw located radially inward from the claw contacting surface is Since it bites into the body, the withdrawal of the tube body is sufficiently regulated.

Moreover, in the pipe joint, the pawl contact surface may be a surface perpendicular to the axial direction.

According to this configuration, since the claw abutting surface is a surface that spreads in a direction perpendicular to the direction in which the tube is pulled out, even if force is applied to the claw abutting surface as the tube is being pulled out, the claw abutting surface is The surface can efficiently support the claw of the rear lock ring.

Further, in the pipe joint, the pawl contact ring may include a pawl holding abutment surface located radially outside the pawl abutting surface and on the near side of the pawl holding portion of the back lock ring. good.

According to this configuration, when a pulling force is generated on the tube body, the claw holding contact surface contacts the claw holding portion of the rear lock ring from the front side, thereby ensuring that the claw holding portion is prevented from deforming. can be regulated.

Further, in the pipe joint, the pawl abutting ring may include a deformable support surface that abuts the pawl holding portion of the front lock ring from the back side.

According to this configuration, even if the claw of the back lock ring is deformed due to a pulling force generated in the tubular body, the deformation support surface of the claw contact ring will keep the claw contact surface or the claw holding contact surface on the back side. It can be supported to prevent it from slipping.

Further, in the pipe joint, the claw contact surface is such that the distance between the inner tip edge of the claw contact surface and the axis of the joint body is such that the distance between the inner tip edge of the locking surface and the axis of the joint body is They may be arranged so as to match the distance between them and the axis.

According to this configuration, the inner tip edge of the pawl abutting ring is located away from the axis of the joint body by the same amount as the inner tip edge of the pressing surface of the cap member, so that the pipe body cannot be inserted into the joint body. This prevents the pawl abutment ring from interfering with the tube body, and when a pull-out force is generated on the tube body, the pawl of the rear lock ring can contact the pawl abutment surface as widely as possible. The claws can be brought into contact with the tubular body.

As described above, according to the present invention, it is possible to provide a pipe joint that can sufficiently restrict the withdrawal of the pipe body.

FIG. 1 is a partially cutaway side view of a pipe joint according to this embodiment. FIG. 2 is an enlarged view of the area indicated by II in FIG. FIG. 3 is a standalone view of the lock ring of the pipe joint, with FIG. 3(a) being a side view and FIG. 3(b) being a front view. FIG. 4 is a partially sectional perspective view of the claw abutment ring of the pipe joint. FIG. 5 is an enlarged view of the periphery of the radially outer end of the pawl contact ring in a partially cutaway side view of the pipe joint according to the modification. FIG. 6 is a partially cutaway side view of a conventional pipe joint. FIG. 7 is a standalone view of the lock ring of the pipe joint, with FIG. 7(a) being a side view and FIG. 7(b) being a front view.

Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. The pipe joint 1 according to this embodiment is suitably used to connect medical gas copper pipes, refrigerant gas copper pipes, etc., which are examples of pipe bodies. It is known that these medical gases, refrigerants (including both gas and liquid), etc., are generally at a higher pressure than, for example, the water pressure of tap water.

As shown in FIG. 1, the pipe joint 1 is a pipe joint that connects the pipe bodies 2A and 2B. The pipe joint 1 also includes a joint body 3, a cap member 4, a plurality of lock rings 5, and a pawl abutment ring 6. In order to connect the pipe bodies 2A and 2B to be connected, the pipe joint 1 includes pipe joint parts 7A and 7B having a bilaterally symmetrical structure at a central position along the axial direction (longitudinal direction) of the pipe bodies 2A and 2B. They are constructed as a pair and a single unit. Therefore, in the following description, the description of the pipe joint portion 7A on one side with respect to the center position will also be used to explain the configuration of the other side.

In addition, although the pipe joint part 7A on one side and the pipe joint part 7B on the other side have a bilaterally symmetrical structure and have an integral joint body 3, in the following description, it will be assumed that the joint body 3 has a bilaterally symmetrical structure and is integral. However, when the joint body 3 is used in the description of the pipe joint portion 7A on one side, it refers to the joint body 3 in the area occupied by the pipe joint portion 7A on the one side. Note that the codes assigned to each part of the pipe joint part 7A are also given to the same parts of the pipe joint part 7B, and the codes given to each part of the pipe joint part 7B are the same as those of the pipe joint part 7A. shall also be attached to the same location.

Hereinafter, the configuration of the one side pipe joint portion 7A will be explained. As shown in FIG. 2, the pipe joint portion 7A includes a joint body 3, a cap member 4, a pair of lock rings 5, and a pawl abutment ring 6. In the pipe joint part 7A, the pair of lock rings 5 are a back lock ring 5C arranged on the back side of the joint body 3, and a front lock ring arranged side by side with the back lock ring 5C on the front side of the joint body 3. A ring 5D is included. Furthermore, the pipe joint portion 7A of this embodiment includes a seal ring 8 (see FIG. 1).

The joint body 3 is a cylindrical portion that is provided with an opening 30 into which the tube 2A is inserted, and through which the tube 2A is inserted to the inner side. The joint body 3 of this embodiment is formed into a cylindrical shape with a body-side insertion space 31 inside. In addition, the joint body 3 has a main body large diameter portion 32 which is the front side (right side in FIG. 1) where the tube 2A starts to be inserted, and a rear side (left side in FIG. 1) where the tube 2A is finished inserted. A main body small diameter portion 33 is integrally provided.

The joint body 3 is made of metal, resin, a composite pipe of metal and resin, or the like. The pipe joint 1 of this embodiment is made of metal.

The opening 30 is a portion into which a region located on the back side of the cap member 4 is inserted. The opening 30 is defined by the inner surface of the large diameter portion 32 of the main body.

The main body side insertion space 31 is formed to communicate with the back side of the opening 30. The inner end of the main body side insertion space 31 has a reduced diameter. Further, the main body side insertion space 31 has a lock ring accommodating portion 310 at the end on the opening 30 side (the end on the near side).

The lock ring accommodating portion 310 is formed to have a smaller diameter than the opening 30 and a larger diameter than the inner end of the main body side insertion space 31. Furthermore, by setting the diameter of the lock ring accommodating portion 310 to be slightly larger than the outer diameter of the lock ring 5, the lock ring 5 can be accommodated in the lock ring accommodating portion 310. The length of the lock ring accommodating portion 310 in the axial direction of the joint body 3 is set to be able to accommodate the pair of lock rings 5.

The main body large diameter portion 32 is formed to have a larger diameter than the main body small diameter portion 33. The main body large diameter portion 32 of this embodiment has a cylindrical shape with the same outer diameter at any location in the axial direction (depth direction, left-right direction in FIG. 1) of the joint main body 3. A female thread is formed on a part of the inner surface of the large diameter portion 32 of the main body. An annular body-side large-diameter seal accommodating portion 320 that accommodates the seal ring 8 (for example, the large-diameter seal ring 80) is formed on the inner surface of the front side of the main body large-diameter portion 32. Further, the main body large diameter portion 32 has a main body side first contact surface 321 that comes into contact with the cap member 4 . The main body side first contact surface 321 is the front end surface of the main body large diameter portion 32 .

The main body small diameter portion 33 is formed to have a smaller diameter than the main body large diameter portion 32. The main body small diameter part 33 of this embodiment includes a first main body small diameter part 34 located on the front side and adjacent to the main body large diameter part 32, and a second main body small diameter part 34 located on the back side and adjacent to the first main body small diameter part 34. A small diameter portion 35 is included.

The first main body small-diameter portion 34 of this embodiment has a tapered cylindrical shape in which the outer diameter becomes smaller as the portion is located further back. The first main body small diameter portion 34 has a main body side second contact surface 340 that comes into contact with the cap member 4 . Further, the first main body small diameter portion 34 has a locking surface 341 that locks onto the back side lock ring 5C from the back side. Further, the first main body small diameter portion 34 has a main body side facing surface 342 that is located on the radially outer side of the back lock ring 5C and the front lock ring 5D, and that faces the back lock ring 5C and the front lock ring 5D. have The first main body small diameter portion 34 of this embodiment has a cylindrical shape with the same outer diameter at any position in the axial direction of the joint main body 3.

In the first main body small diameter portion 34 of this embodiment, the locking surface 341 and the main body side opposing surface 342 define a lock ring housing portion 310. The main body side second contact surface 340 is, for example, a surface perpendicular to the axial direction of the joint main body 3. The locking surface 341 is, for example, a surface perpendicular to the axial direction of the joint body 3. A radially inner portion of the locking surface 341 is chamfered.

The main body side facing surface 342 extends from the radially outer edge of the locking surface 341 toward the front side. Further, the main body side facing surface 342 extends from the radially inner tip edge of the main body side second contact surface 340 toward the back side. Further, the main body side facing surface 342 is, for example, a surface extending in the axial direction of the joint main body 3.

The second main body small diameter portion 35 has an annular stepped surface 350 that comes into contact with the innermost end surface 20A of the inserted tube 2A. Further, the second main body small diameter portion 35 has a stepped wall 351 that is formed to be reduced in diameter at a central position in the axial direction of the joint main body 3. Further, the second main body small diameter portion 35 has an extending surface 352 extending toward the front side from the stepped surface 350.

The stepped surface 350 of this embodiment is a surface perpendicular to the axial direction of the joint body 3. Further, the stepped surface 350 is a side surface of the stepped wall 351.

The extending surface 352 is a surface inclined with respect to the stepped surface 350. Further, the extending surface 352 extends from the radially inner edge of the locking surface 341 toward the back side. The extending surface 352 of this embodiment extends in the axial direction of the joint body 3. Moreover, the extending surface 352 is arranged so as to be located radially outward from the outer circumferential surface of the tube body 2A.

The cap member 4 is a cylindrical member that is assembled into the opening 30 of the joint body 3. The cap member 4 of this embodiment is assembled into the opening 30 by screw fastening. The cap member 4 is made of metal, for example. The cap member 4 is formed into a cylindrical shape with a cap-side insertion space 40 inside. The cap side insertion space 40 communicates with the main body side insertion space 31 in a state where the cap member 4 is assembled to the joint body 3.

The cap member 4 of the present embodiment includes a reduction part 41 which is the end on the front side, a cap large diameter part 42 integrally formed on the back side of the reduction part 41, and a cap large diameter part 42 on the back side of the cap large diameter part 42. The cap has a small diameter portion 43 that is integrally formed. Note that the cap member 4 is made of metal or resin, and the cap member 4 of this embodiment is made of metal.

The outer surface of the shrinking portion 41 is formed into a conical shape by shrinking toward the front side. An auxiliary seal accommodating portion 410 is formed on the inner surface of the reduction portion 41 to accommodate the seal ring 8 (for example, auxiliary seal ring 81). The auxiliary seal ring 81 comes into contact with the outer circumferential surface of the pipe body 2A and helps prevent, for example, condensation generated on the outer circumferential surface of the pipe body 2A outside the pipe fitting 1 from penetrating into the inside of the pipe fitting 1. .

The cap large diameter portion 42 is a portion that is gripped with a tool. The cap member 4 is screwed onto the joint body 3 by gripping the large diameter portion 42 of the cap with a tool and rotating it. The cap large diameter portion 42 has a cap side first contact surface 421 that contacts the main body side first contact surface 321 of the main body large diameter portion 32 .

The cap-side first contact surface 421 is a surface perpendicular to the axial direction of the joint body 3. Moreover, the cap side first contact surface 421 is an annular surface.

The small diameter portion 43 of the cap is formed to have a smaller diameter than the large diameter portion 42 of the cap. Further, the cap small diameter portion 43 is integrally formed with the cap large diameter portion 42 via the cap side first contact surface 421.

Furthermore, the cap small diameter portion 43 has a small diameter portion back end surface 430 that is a back end surface. The small diameter portion inner end surface 430 is an annular surface. Further, the small diameter portion rear end surface 430 is set to have a longer length in the radial direction than the main body side second contact surface 340. Further, the small diameter portion rear end surface 430 is a surface substantially perpendicular to the axial direction of the joint body 3.

Specifically, the small diameter portion rear end surface 430 has a pressing surface 431 that presses the front lock ring 5D from the front side. Further, the small-diameter inner end surface 430 has a cap-side second contact surface 432 that contacts the main-body-side second contact surface 340 of the joint main body 3 . In the small diameter portion rear end surface 430, an annular recess (number omitted) is formed between the pressing surface 431 and the cap side second contact surface 432.

The holding surface 431 is spaced from the locking surface 341 of the joint body 3 in the axial direction of the joint body 3 . The holding surface 431 of this embodiment is a surface parallel to the locking surface 341. Further, the holding surface 431 is, for example, a surface perpendicular to the axial direction of the joint body 3. Further, the holding surface 431 comes into contact with the front lock ring 5D when a pulling force is applied to the tubular body 2A. In this embodiment, the radially inner portion and the radially outer portion of the holding surface 431 are chamfered. Further, in the radial direction, the inner tip edge 433 of the holding surface 431 is arranged at the same position as the inner tip edge 343 of the locking surface 341.

The cap-side second contact surface 432 is, for example, processed into a smooth surface. Further, the cap-side second contact surface 432 is arranged on the stepped surface 350 side and inside the male thread of the main body large diameter portion 32 of the joint main body 3.

The small diameter portion 43 of the cap of this embodiment has a guide surface 434 extending toward the front from the inner tip edge 433 of the holding surface 431 . The guide surface 434 extends, for example, in the axial direction of the joint body 3. Further, the guide surface 434 is arranged so as to be located radially outward from the outer circumferential surface of the tube body 2A.

A cap-side large-diameter seal accommodating portion 420 for accommodating the large-diameter seal ring 80 on the inner diameter side is formed on the front side of the outer surface of the cap small-diameter portion 43 of this embodiment. On the outer surface of the cap small diameter portion 43 , a male thread that is screwed into the female thread of the main body large diameter portion 32 of the joint body 3 is formed in a portion on the back side of the cap side large diameter seal accommodating portion 420 .

An annular cap-side small-diameter seal accommodating portion 435 is formed on the inner surface of the cap small-diameter portion 43 for accommodating the seal ring 8 (for example, the small-diameter seal ring 82). The cap-side small-diameter seal accommodating portions 435 are spaced apart in the axial direction of the joint body 3.

In the pipe joint 1 according to the present embodiment, the pipe joint parts 7A having the above-mentioned configuration are configured as a pair of bilaterally symmetrical integral structures. In the pipe joint 1, the pair of lock rings 5 are attached to the joint body 3 with the flange 50 located on the radially inner side of the inner surface of the joint body 3, and the claws 52 extending further toward the inner surface of the joint body 3. They are housed side by side in the axial direction. In the cap member 4, the small-diameter seal ring 82 is attached to the cap-side small-diameter seal accommodating portion 435, and the large-diameter seal ring 80 is attached to the cap-side large-diameter seal accommodating portion 420 at its inner diameter side portion. In this way, with each member attached to the joint body 3 and the cap member 4, the small diameter portion 43 of the cap member 4 is inserted into the opening 30 of the joint body 3, and assembled by screwing the male and female threads together. wear. Thereby, the joint main body 3 and the cap member 4 are integrated, the main body side insertion space 31 and the cap side insertion space 40 communicate with each other, and an insertion space for the tube body 2A is formed.

When assembling the cap member 4 into the opening 30 of the joint body 3 by fastening the male and female threads, the large diameter portion 42 of the cap is grasped with a tool, the cap member 4 is rotated, and the joint body is assembled. 3. Tighten the cap member 4. Then, the outer diameter side portion of the large diameter seal ring 80 is accommodated in the main body side large diameter seal accommodating portion 320.

Further, the large diameter seal ring 80 is held between the outer surface of the cap side large diameter seal housing section 420 and the inner surface of the main body side large diameter seal housing section 320 and is compressed. As a result, the gap between the inner surface of the main body large diameter portion 32 and the outer surface of the cap small diameter portion 43 is sealed in the axially outward direction with respect to the threaded portion of the male thread and the female thread.

The pair of lock rings 5 are arranged side by side in the lock ring accommodating portion 310 so as to be in contact with each other in the axial direction of the joint body 3. Since the pair of lock rings 5 have similar configurations, the description of the configuration of one lock ring 5 will be shared with the description of the other lock ring 5.

As shown in FIG. 2, the lock ring 5 includes an annular flange 50 centered in the axial direction of the joint body 3, and an annular claw holding portion formed by bending the end of the flange 50 toward the center. 51, and a plurality of pawls 52 formed on the inner surface of the pawl holding portion 51 by being bent in the axial direction of the joint body 3. Further, the lock ring 5 is provided with an annular space 53 surrounded by a flange 50, a claw holding portion 51, and a claw 52.

The thickness of the lock ring 5 of this embodiment is the same in all parts. Moreover, the lock ring 5 of this embodiment is made of metal.

The flange 50 of this embodiment extends in the axial direction of the joint body 3. The flange outer surface 501 located on the radially outer side of the flange 50 is, for example, a plane extending in the axial direction. The flange inner surface 502 located on the radially inner side of the flange 50 is, for example, a plane extending in the axial direction. The front side portions of the flange outer surface 501 and the flange inner surface 502 are both chamfered.

The claw holding portion 51 of this embodiment extends in a direction perpendicular to the axial direction of the joint body 3. The claw holding back surface 510 located on the back side of the claw holding part 51 is, for example, a plane extending in a direction perpendicular to the axial direction. A claw holding front side surface 511 located on the near side of the claw holding part 51 is, for example, a plane extending in a direction perpendicular to the axial direction. The radially inner portions of the claw holding rear side surface 510 and the claw holding front side surface 511 are both chamfered.

In the lock ring 5 of this embodiment, the claws 52 are arranged on the inner peripheral surface of the claw holding portion 51 at equal intervals in the circumferential direction. Moreover, each claw 52 is bent so as to be inclined toward the insertion direction (inner side) of the tubular body 2A. The outer diameter line of the claw 52 is formed into an arc shape, as shown in FIG. The virtual circle C connecting the tips 520 of the claws 52 has a slightly smaller diameter than the outer diameter of the tubular body 2A, as shown in FIG. 3(b). That is, the distal end portion 520 of the claw 52 is located radially inner than the extending surface 352 and the guide surface 434 (see FIG. 2).

The claw outer surface 521 located on the radially outer side of the claw 52 is, for example, a flat surface. The claw inner surface 522 located on the radially inner side of the claw 52 is, for example, a flat surface.

The pair of lock rings 5 described above are housed in a space surrounded by the locking surface 341 of the joint body 3, the pressing surface 431 of the cap member 4, and the inner surface of the joint body 3 (for example, the body side facing surface 342). , and is configured such that a claw 52 is engaged with the outer circumferential surface of the inserted tube 2A to restrict withdrawal of the tube 2A.

Further, in the pair of lock rings 5, when a pulling force is applied to the tubular body 2A, the front lock ring 5D comes into contact with the pressing surface 431 of the cap member 4, thereby restricting movement toward the front side.

The pawl abutment ring 6 is accommodated within the annular space 53 of the lock ring 5. Further, the pawl abutment ring 6 is accommodated within the annular space 53 in a state in which displacement in the radial direction is allowed. The claw contact ring 6 of this embodiment is made of metal.

Furthermore, the pawl abutting ring 6 is arranged on the near side of the pawl 52 of the back lock ring 5C, and comes into contact with the pawl 52 from the front side when the pawl 52 of the back lock ring 5C is deformed to the front side. It has a claw contact surface 60. The pawl abutment ring 6 of this embodiment includes a pawl holding abutment surface 61 located on the radially outer side of the pawl abutment surface 60 and on the near side of the pawl holding portion 51 of the back lock ring 5C. The pawl abutting ring 6 also includes a deformable support surface 62 that abuts the pawl holding portion 51 of the front lock ring 5D from the back side.

The claw abutting ring 6 of this embodiment includes a ring bottom surface 63 which is a surface located on the radially inner side of the claw abutting ring 6, and a ring top surface 64 which is a surface located on the radially outer side of the claw abutting ring 6. has. Furthermore, the pawl contact ring 6 has a connecting surface 65 that connects the inner tip edge of the deformable support surface 62 and the near side edge of the ring bottom surface 63.

The pawl contact surface 60 is, for example, a surface that comes into contact with a portion of the pawl 52 of the inner lock ring 5C, excluding the tip portion 520. Further, the claw abutting surface 60 is a surface located on the radially inner side and the back side of the claw abutting ring 6. The pawl contact surface 60 of this embodiment is arranged between the pawl 52 of the rear lock ring 5C and the pawl 52 of the front lock ring 5D. That is, from the back side of the joint body 3 toward the front side, the claw 52 of the back lock ring 5C, the claw contact surface 60, and the claw 52 of the front lock ring 5D are arranged in this order.

Further, the claw contact surface 60 extends parallel to the claw holding contact surface 61. The claw contact surface 60 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the pawl contact surface 60 is a surface perpendicular to the axial direction of the joint body 3.

The claw contact surface 60 of this embodiment is continuous with the claw holding contact surface 61 in the radial direction. Further, the claw contact surface 60 of this embodiment is flush with the claw holding contact surface 61.

Furthermore, in the pawl contact ring 6 of this embodiment, the distance between the inner tip edge 600 of the pawl contact surface 60 and the axis α of the joint body 3 is the inner tip edge of the locking surface 341 of the joint body 3. 343 and the axis α of the joint body 3. Further, the distance between the inner tip edge 600 of the pawl contact surface 60 and the axis α of the joint body 3 is the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3. It also matches the distance of In addition, as the inner tip edge of a chamfered portion such as the locking surface 341 or the holding surface 431, the inner tip edge of this portion before being chamfered (assuming no chamfering is applied). is used.

In this pawl abutting ring 6, the pawl 52 of the inner lock ring 5C extends radially inward from the pawl abutting surface 60. Further, the claw 52 of the front lock ring 5D of this embodiment extends radially inward from the claw contact surface 60.

The pawl holding contact surface 61 is, for example, a surface that comes into contact with the pawl holding portion 51 of the inner lock ring 5C. Specifically, the claw holding contact surface 61 contacts the claw holding front side surface 511 of the back lock ring 5C. Further, the pawl holding abutting surface 61 is a surface located on the radially outer side and the back side of the pawl abutting ring 6. The claw holding contact surface 61 extends further radially outward from the radially outer edge of the claw contact surface 60.

The claw holding contact surface 61 of this embodiment is arranged between the claw holding part 51 of the rear lock ring 5C and the claw holding part 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding part 51 of the back lock ring 5C, the claw holding contact surface 61, and the claw holding part 51 of the front lock ring 5D are arranged in this order. ing.

Further, the claw holding contact surface 61 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the claw holding abutment surface 61 is a surface perpendicular to the axial direction of the joint body 3. The radially outer portion of the claw holding contact surface 61 is chamfered.

The deformation support surface 62 abuts against the claw holding rear side surface 510 of the front lock ring 5D. Further, the deformation support surface 62 is a surface located on the radially outer side and the front side of the pawl abutment ring 6. The deformable support surface 62 of this embodiment is arranged between the claw holding part 51 of the back lock ring 5C and the claw holding part 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding part 51 of the back lock ring 5C, the deformation support surface 62, and the claw holding part 51 of the front lock ring 5D are arranged in this order. .

Further, the deformation support surface 62 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformation support surface 62 is a surface parallel to the claw contact surface 60 and the claw holding contact surface 61. Moreover, the deformation support surface 62 is arranged so as to be spaced apart from the claw holding contact surface 61 toward the back side.

A radially outer portion of the deformable support surface 62 is chamfered. In the axial direction of the joint body 3, the distance (dimension) between the deformation support surface 62 and the pawl holding abutment surface 61 is set such that the pawl abutment ring 6 is allowed to shift in the radial direction. For example, the distance between the claw-holding rear side surface 510 of the front lock ring 5D and the claw-holding front side surface 511 of the rear lock ring 5C is sufficient.

The ring bottom surface 63 extends from the inner tip edge of the claw contact surface 60 toward the front side. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. Further, the ring bottom surface 63 is located radially outward from the tip portion 520 of the claw 52 of the lock ring 5.

Further, the ring bottom surface 63 is, for example, an annular surface, as shown in FIG. The ring bottom surface 63 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the ring bottom surface 63 is a surface extending in the axial direction of the joint body 3. Furthermore, the distance between the ring bottom surface 63 of the pawl abutting ring 6 and the axis α of the joint body 3 matches the distance between the extending surface 352 of the joint body 3 and the axis α of the joint body 3 ( (see Figure 2).

The ring top surface 64 extends between the outer edge of the claw holding abutting surface 61 and the outer edge of the deformable support surface 62. Further, the ring top surface 64 may be a flat surface or a curved surface, and is, for example, a flat surface. Note that the ring top surface 64 extends parallel to the flange inner surface 502 of the front lock ring 5D. In this embodiment, the ring top surface 64 is chamfered at the back side portion and the front side portion.

The ring top surface 64 extends, for example, in parallel with the flange inner surface 502 of the front lock ring 5D. Further, the ring top surface 64 is arranged so as to be spaced radially inward from the flange inner surface 502 of the front lock ring 5D. The distance in the radial direction between the ring top surface 64 and the flange inner surface 502 in this embodiment is the same at any location in the axial direction of the joint body 3, except for the chamfered portion of the ring top surface 64.

The connection surface 65 is arranged closer to the front than the claw contact surface 60. Further, the connecting surface 65 may be a flat surface or a curved surface, and is, for example, a flat surface. Further, the connecting surface 65 is disposed between the radially outer portion of the claw holding portion 51 and the claw 52 of the back lock ring 5C and the radially outer portion of the claw holding portion 51 and the claw 52 of the front lock ring 5D. has been done. The connecting surface 65 is spaced radially inward from the claw inner surface 522 of the front lock ring 5D.

In the pipe fitting 1 described above, by providing the claw contact surface 60 on the claw contact ring 6, a pulling force acts on the tube body 2A, and a force directed toward the near side is applied to the claw 52 of the rear lock ring 5C. Therefore, even if the claw 52 is deformed toward the front side, the claw 52 contacts the claw contact surface 60. At this time, the pawl contact ring 6 is allowed to shift in the radial direction within the annular space 53. Specifically, the rear lock ring 5C and the front lock ring 5D are surrounded by the flange 50 in the radial direction, and the front lock ring 5D abuts against the presser surface 431, thereby restricting movement toward the front side. ing. Among the rear lock ring 5C and the front lock ring 5D, the pawl abutment ring 6 is allowed to shift in the radial direction, so the pawl abutment ring 6 is aligned with the pawl 52 of the rear lock ring 5C. By being centered by contact with the nail abutting ring 6, the axial center of the claw abutting ring 6 and the axial center of the tubular body 2A are aligned. Therefore, each claw 52 provided on the inner lock ring 5C evenly contacts the claw contact surface 60.

Then, as the tube body 2A is further pulled out, the claw 52 of the inner lock ring 5C is along the claw contact surface 60 of the claw contact ring 6, and the diameter of the claw 52 is larger than the claw contact surface 60 of the claw 52. Since the inner portion bites into the tubular body 2A, the withdrawal of the tubular body 2A is sufficiently restricted.

In the pipe joint 1 of the above embodiment, the claw contact surface 60 is a surface perpendicular to the axial direction of the joint main body, that is, a surface extending in a direction perpendicular to the direction in which the pipe body 2A is pulled out. Even if force is applied to the claw abutting surface 60 as the pulling progresses, the claw abutting surface 60 can efficiently support the claw 52 of the inner lock ring 5C.

In addition, in the pipe joint 1 of the above embodiment, the claw holding contact surface 61 is located on the radially outer side of the claw contact surface 60 and on the near side of the claw holding portion 51 of the back lock ring 5C. When a pulling force is generated on the tubular body 2A, the claw holding contact surface 61 contacts the claw holding portion 51 of the rear lock ring 5C from the front side, so that the deformation of the claw holding portion 51 is reliably prevented. Can be regulated.

Furthermore, in the pipe joint 1 of the above embodiment, the deformation support surface 62 contacts the claw holding portion 51 of the front lock ring 5D from the back side, so that a pulling force is generated on the pipe body 2A, and Even if the pawl 52 of the lock ring 5C is deformed and pressure is applied to the pawl contact surface 60 or the pawl holding abutment surface 61, the deformed support surface 62 of the pawl abutment ring 6 may It is possible to support the holding contact surface 61 so that it does not shift toward the back side.

In the pipe joint 1 of the embodiment described above, the distance between the ring bottom surface 63 of the pawl contact ring 6 and the axis α of the joint body 3 is the same as the distance between the inner tip edge 343 of the locking surface 341 of the joint body 3 and the joint body 3. Since the pawl abutment ring 6 is arranged so that the distance between the pawl abutment ring 6 and the axis α of Since it is disposed as far away from the axis α of the joint body 3 as the tip edge 343, it prevents the pawl contact ring 6 from interfering with the pipe body 2A when inserting the pipe body 2A into the joint body 3. In addition, when a pulling force is applied to the tube body 2A, the claw 52 of the inner lock ring 5C abuts the claw contact surface 60 as wide as possible, and the claw 52 is pulled against the tube body 2A. You can make it bite.

Although one embodiment of the present invention has been described, the present invention is not limited to the embodiment.

Although the claw contact ring 6 of the above embodiment was provided with a claw holding contact surface 61, a deformation support surface 62, etc. in addition to the claw contact surface 60, it is sufficient that the claw contact ring 6 includes at least the claw contact surface 60. . For example, it is conceivable that the pawl abutment ring 6 does not include the pawl holding abutment surface 61. It is also conceivable that the pawl abutment ring 6 does not include the deformable support surface 62.

Although the pawl contact surface 60 in the above embodiment is a surface perpendicular to the axial direction of the joint body 3, it may be a surface inclined with respect to this axial direction. For example, the claw contact surface 60 may extend along the direction in which the claw 52 of the inner lock ring 5C extends. An example of the pawl contact ring 6 having such a configuration will be described in detail below using FIG. 5.

The pawl contact ring 6 has a ring bottom surface 63 as a ring bottom surface portion located radially inward from the pawl contact surface 60. Further, the pawl contact ring 6 has a ring top surface 64 located on the radially outer side. Further, the pawl contact ring 6 has a front side connecting surface 65 that connects the inner tip edge of the deformable support surface 62 and the front edge of the ring bottom surface 63. The claw contact ring 6 has a back side connecting surface 66 that connects the inner tip edge of the claw contact surface 60 and the back end edge of the ring bottom surface 63.

The pawl contact surface 60 is, for example, a surface that comes into contact with a portion of the pawl 52 of the inner lock ring 5C, excluding the tip portion 520. Specifically, the pawl contact surface 60 faces a radially outer portion of the pawl 52 of the inner lock ring 5C (for example, a portion less than half of the radially outer portion of the pawl 52). Moreover, the pawl contact surface 60 is spaced apart from the radially outer portion of the pawl 52 of the inner lock ring 5C.

Further, the claw abutting surface 60 is a surface located on the radially inner side and the back side of the claw abutting ring 6. The pawl contact surface 60 of this embodiment is arranged between the pawl 52 of the rear lock ring 5C and the pawl 52 of the front lock ring 5D. That is, from the back side of the joint body 3 toward the front side, the claw 52 of the back lock ring 5C, the claw contact surface 60, and the claw 52 of the front lock ring 5D are arranged in this order.

Moreover, the pawl contact surface 60 extends along the direction in which the pawl 52 of the inner lock ring 5C extends. For example, the claw contact surface 60 extends in a different direction from the claw holding contact surface 61. The claw contact surface 60 of this embodiment is continuous with the claw holding contact surface 61 in the radial direction.

The claw abutting surface 60 has an extending tip 601. The extending tip portion 601 is arranged radially outwardly by a predetermined distance from the radially inner tip edge of the claw outer surface 521, which is the front side surface of the claw 52 of the back lock ring 5C. The claw contact surface 60 may be a flat surface or a curved surface, and is, for example, a flat surface.

Furthermore, in the pawl contact ring 6 of this embodiment, the distance between the inner tip edge 600 of the pawl contact surface 60 and the axis α of the joint body 3 is the inner tip edge of the locking surface 341 of the joint body 3. 343 and the axis α of the joint body 3. Further, the distance between the inner tip edge 600 of the pawl contact surface 60 and the axis α of the joint body 3 is the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3. greater than the distance. In addition, as the inner tip edge of a chamfered portion such as the locking surface 341 or the holding surface 431, the inner tip edge of this portion before being chamfered (assuming no chamfering is applied). is used.

In this pawl abutting ring 6, the pawl 52 of the inner lock ring 5C extends radially inward from the pawl abutting surface 60. Further, the claw 52 of the front lock ring 5D of this embodiment extends radially inward from the claw contact surface 60.

The pawl holding contact surface 61 is, for example, a surface that comes into contact with the pawl holding portion 51 of the inner lock ring 5C. Specifically, the claw holding contact surface 61 contacts the claw holding front side surface 511 of the back lock ring 5C. Further, the pawl holding abutting surface 61 is a surface located on the radially outer side and the back side of the pawl abutting ring 6. The claw holding contact surface 61 extends further radially outward from the radially outer edge of the claw contact surface 60.

The claw holding contact surface 61 of this embodiment is arranged between the claw holding part 51 of the rear lock ring 5C and the claw holding part 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding part 51 of the back lock ring 5C, the claw holding contact surface 61, and the claw holding part 51 of the front lock ring 5D are arranged in this order. ing.

Further, the claw holding contact surface 61 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the claw holding abutment surface 61 is a surface perpendicular to the axial direction of the joint body 3. The radially outer portion of the claw holding contact surface 61 is chamfered.

The deformation support surface 62 abuts against the claw holding rear side surface 510 of the front lock ring 5D. Further, the deformation support surface 62 is a surface located on the radially outer side and the front side of the pawl abutment ring 6. The deformable support surface 62 of this embodiment is arranged between the claw holding part 51 of the back lock ring 5C and the claw holding part 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding part 51 of the back lock ring 5C, the deformation support surface 62, and the claw holding part 51 of the front lock ring 5D are arranged in this order. .

Further, the deformation support surface 62 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformation support surface 62 is a surface parallel to the claw contact surface 60 and the claw holding contact surface 61. Moreover, the deformation support surface 62 is arranged so as to be spaced apart from the claw holding contact surface 61 toward the back side.

A radially outer portion of the deformable support surface 62 is chamfered. In the axial direction of the joint body 3, the distance (dimension) between the deformation support surface 62 and the pawl holding abutment surface 61 is set such that the pawl abutment ring 6 is allowed to shift in the radial direction. For example, the distance between the claw-holding rear side surface 510 of the front lock ring 5D and the claw-holding front side surface 511 of the rear lock ring 5C is sufficient.

The ring bottom surface 63 extends from the inner tip edge of the claw contact surface 60 toward the front side. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. Further, the ring bottom surface 63 is located radially outward from the tip portion 520 of the claw 52 of the lock ring 5.

Further, the ring bottom surface 63 is, for example, an annular surface. The ring bottom surface 63 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the ring bottom surface 63 is a surface extending in the axial direction of the joint body 3. Further, the distance between the ring bottom surface 63 of the pawl abutment ring 6 and the axis α of the joint body 3 corresponds to the distance between the extending surface 352 of the joint body 3 and the axis α of the joint body 3.

The ring top surface 64 extends between the outer edge of the claw holding abutting surface 61 and the outer edge of the deformable support surface 62. Further, the ring top surface 64 may be a flat surface or a curved surface, and is, for example, a flat surface. Note that the ring top surface 64 extends parallel to the flange inner surface 502 of the front lock ring 5D. In this embodiment, the ring top surface 64 is chamfered at the back side portion and the front side portion.

Further, the ring top surface 64 extends, for example, in parallel with the flange inner surface 502 of the front lock ring 5D. Further, the ring top surface 64 is arranged so as to be spaced radially inward from the flange inner surface 502 of the front lock ring 5D. The distance in the radial direction between the ring top surface 64 and the flange inner surface 502 in this embodiment is the same at any location in the axial direction of the joint body 3, except for the chamfered portion of the ring top surface 64.

The front side connection surface 65 is arranged on the front side of the claw contact surface 60. Further, the front side connection surface 65 may be a flat surface or a curved surface, and is, for example, a flat surface. Furthermore, the front side connection surface 65 is between the radially outer part of the claw holding part 51 and the claw 52 of the back lock ring 5C and the radially outer part of the claw holding part 51 and the claw 52 of the front lock ring 5D. It is located in The front side connection surface 65 is arranged in a radially inwardly spaced state with respect to the claw inner surface 522 of the front side lock ring 5D.

The back side connection surface 66 is arranged further back than the claw contact surface 60. Further, the back side connection surface 66 may be a flat surface or a curved surface, and is, for example, a flat surface. The back side connection surface 66 is a surface perpendicular to the axial direction of the joint body 3. Furthermore, the inner side connecting surface 66 extends radially inward from the inner tip edge 600 of the claw contacting surface 60.

The back side connection surface 66 is arranged between the claw 52 of the back side lock ring 5C and the claw 52 of the front side lock ring 5D. The back side connection surface 66 is arranged so as to be spaced toward the front side with respect to the claw outer surface 521 of the front side lock ring 5D. The inner tip edge 660 of the back side connection surface 66 of this embodiment is located radially outward from the inner tip edge of the claw 52 of the back side lock ring 5C and the front side lock ring 5D.

Furthermore, in the pawl contact ring 6 of this embodiment, the distance between the inner tip edge 660 of the back side connecting surface 66 and the axis α of the joint body 3 is the inner tip edge of the locking surface 341 of the joint body 3. 343 and the axis α of the joint body 3. The distance between the inner tip edge 660 of the back side connecting surface 66 and the axis α of the joint body 3 is the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3. greater than the distance.

In the above-described pipe joint 1, the claw abutment ring 6 is provided with the claw contact surface 60 that extends in the direction in which the claws 52 of the lock ring 5 extend, so that a pulling force acts on the tube body 2A. Even if the claw 52 of the rear lock ring 5C is deformed toward the front, the claw 52 contacts the claw contact surface 60. At this time, since the pawl contact surface 60 restricts the deformation of the pawl 52 of the inner lock ring 5C, the portion of the pawl 52 located radially inward from the pawl contact surface 60 (for example, the tip portion 520 ) firmly bites into the tubular body 2A, so that the withdrawal of the tubular body 2A is sufficiently regulated.

In the pipe joint 1 of the above embodiment, the extending tip of the claw contact surface 60 is spaced radially outward by a predetermined distance from the radially inner tip of the front side surface of the claw 52 of the back lock ring 5C. Therefore, since the tip 520 of the claw 52 of the back lock ring 5C and the claw contact surface 60 are separated, when a pulling force is generated on the tube 2A, the tip of the claw 52 of the back lock ring 5C Since the portion 530 reliably deforms and bites into the tubular body 2A, it is possible to reliably restrict the withdrawal of the tubular body 2A.

Further, in the pipe joint 1 of the above embodiment, since the ring bottom surface 63 is flat, even if the ring bottom surface 63 hits the tube body 2A, the ring bottom surface 63 will not damage the tube body 2A. Furthermore, since the ring bottom surface 63 is flat, the strength of the portion of the claw abutment ring 6 on the ring bottom surface 63 side is ensured, so that a pulling force is generated in the tubular body 2A, and the claw 5 of the inner lock ring 5C Even if the ring is deformed, the ring bottom surface 63 can support the claw contact surface 60 so that it does not shift toward the back side.

Although the ring bottom surface 63 of the claw contact ring 6 in the above embodiment was a flat surface, it may be a curved surface. For example, it is conceivable that the ring bottom surface 63 is a curved surface having a convex shape radially inward.

Although the plurality of claws 52 of the lock ring 5 in the above embodiment are arranged at equal intervals in the circumferential direction, they may be arranged at different intervals in the circumferential direction.

Although the cap member 4 of the above embodiment was assembled to the joint body 3 by screw fastening, it may be assembled by other methods such as fitting.

1... Pipe joint, 2A, 2B... Pipe body, 3... Joint body, 4... Cap member, 5... Lock ring, 5C... Back side lock ring, 5D... Front side lock ring, 6... Claw contact ring, 7A, 7B... Pipe joint part, 8... Seal ring, 20A... Innermost end surface, 30... Opening, 31... Main body side insertion space, 32... Main body large diameter part, 33... Main body small diameter part, 34... First main body small diameter part, 35... Second main body small diameter part, 40... Cap side insertion space, 41... Reduction part, 42... Cap large diameter part, 43... Cap small diameter part, 50... Flange, 51... Claw holding part, 52... Claw, 53... Annular Space, 60...Claw contact surface, 61...Claw holding contact surface, 62...Deformation support surface, 63...Ring bottom surface, 64...Ring top surface, 65...Connection surface (front side connection surface), 66...Back side connection Surface, 80...Large diameter seal ring, 81...Auxiliary seal ring, 82...Small diameter seal ring, 101...Pipe joint, 103...Joint body, 104...Cap member, 105...Lock ring, 150...Flange, 151...Claw holding part , 152...Claw, 310...Lock ring accommodating part, 320...Main body side large diameter seal accommodating part, 320...Main body side large diameter seal accommodating part, 321...Main body side first contact surface, 340...Main body side second contact Surface, 341... Locking surface, 342... Main body side opposing surface, 343... Inner tip edge, 350... Stepped surface, 351... Stepped wall, 352... Extension surface, 410... Auxiliary seal housing portion, 420... Cap side large Diameter seal housing part, 421... Cap side first contact surface, 430... Small diameter part rear side end surface, 431... Pressing surface, 432... Cap side second contact surface, 433... Inner tip edge, 434... Guide surface, 435 ...Cap side small diameter seal housing part, 501...Flange outer surface, 502...Flange inner surface, 510...Claw holding back side, 511...Claw holding front side, 520...Tip part, 521...Claw outer surface, 522...Claw inner surface, 600...Inner side Tip edge, 601... Extending tip portion, 660... Inner tip edge, α... Axis center, C... Virtual circle

Claims (5)

A pipe joint for connecting pipe bodies,
a cylindrical joint body provided with an opening into which the tube is inserted, and into which the tube is inserted to the back side;
a cylindrical cap member assembled into the opening;
an annular flange centered on the axial direction of the joint body; an annular pawl holding portion formed by bending the end of the flange toward the center; a plurality of pawls each formed by bending in a direction, and the flange is located radially inward from the inner surface of the joint body, and the pawl extends further toward the rear as the radially inner side of the joint body increases. a pair of lock rings housed in the joint body side by side in the axial direction, a rear lock ring disposed on the rear side of the joint body and a front lock ring disposed on the front side of the joint body; A pair of lock rings including;
The joint body has a locking surface that locks onto the back side lock ring from the back side,
The cap member has a pressing surface that presses the front lock ring from the front side,
The pair of lock rings are housed in a space surrounded by a locking surface of the joint main body, a pressing surface of the cap member, and an inner surface of the joint main body, and the outer periphery of the inserted pipe body. The claws are configured to lock onto the surface to restrict withdrawal of the tubular body,
further comprising a pawl abutment ring housed in an annular space surrounded by the flange of the front lock ring, the pawl holding portion, and the pawl,
The pawl abutting ring is disposed in front of the pawl of the back lock ring, and has a pawl abutting surface that comes into contact with the pawl from the front side when the pawl of the back lock ring is deformed toward the front. have,
The claw of the inner lock ring extends radially inward than the claw abutting surface,
The pipe joint is characterized in that the pawl abutment ring is accommodated in the annular space in a state in which displacement in the radial direction is permitted. The pipe joint according to claim 1, wherein the claw contact surface is a surface perpendicular to the axial direction. According to claim 1 or 2, the pawl contact ring includes a pawl holding contact surface located radially outside the pawl contact surface and on the near side of the pawl holding portion of the back lock ring. Pipe fittings listed. The pipe joint according to any one of claims 1 to 3, wherein the pawl abutting ring includes a deformable support surface that abuts the pawl holding portion of the front lock ring from the back side. The distance between the inner tip edge of the claw contact surface and the axis of the joint body is equal to the distance between the inner tip edge of the locking surface and the axis of the joint body. The pipe joint according to any one of claims 1 to 4, wherein the pipe joint is arranged so as to correspond to the shape of the pipe joint.