JP2014190366A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint which can obtain sufficient caulking performance even if used in a hose having a reinforcing layer composed of a metal material without deteriorating the insertion performance of the hose.SOLUTION: A pipe joint comprises: an external cylindrical body having a small-diameter hole and a large-diameter hole larger than the small-diameter hole in hole diameter; a core body which has a flange and a shaft, in which shaft holes are formed at the flange and the shaft, which is slidable to an axial direction in the large-diameter hole of the external cylindrical body, and in which the flange is arranged at the small-diameter hole side; and a holding member which can be expanded and contracted in diameter, has an inside diameter larger than an outside diameter of the shaft of the core body, and is slidably arranged in the axial direction between the larger-diameter hole of the external cylindrical body and the shaft of the core body. The pipe joint caulks a hose between the holding member and the shaft of the core body. The holding member 30 is composed of a plurality of main bodies 31 which are arranged in a circumferential direction, and a joining part 32 for joining the main bodies. The main bodies are composed of metal materials, and the joining part is composed of an elastic material.

Description

  The present invention relates to a pipe joint, and more particularly, to an improvement of a pipe joint that allows one-touch fastening of a hose.

  In general, a hose used for circulating a high-pressure fluid has a composite structure composed of a plurality of layers such as an inner tube, a reinforcing layer, and a jacket. As a pipe joint used for a hose reinforced with such a reinforcing layer, a so-called one-touch type pipe joint is known in which an operator can perform a fastening operation with the hose by one operation.

  As such a one-touch type pipe joint, for example, as described in Patent Document 1, a collet that can be expanded and contracted in an annular space formed inside is provided. There is known a pipe joint having a structure in which a hose is tightly coupled with the hose.

JP 2000-249279 A (Claims etc.)

  FIG. 7A shows a half cross-sectional view of an example of a conventional one-touch hose pipe joint. Such a conventional one-touch hose fitting includes a core body 102 having a flange portion 102a at one end in a large-diameter portion of the outer cylinder 101, and a holding member 103 capable of expanding and contracting disposed on the outer peripheral side thereof. The hose (not shown) is caulked between the core body 102 and the holding member 103 using internal pressure. Reference numeral 104 in the figure denotes a sleeve for reducing the diameter of the holding member, reference numerals 105 and 106 denote O-rings for sealing, and reference numeral 107 denotes a holder for preventing the sleeve from falling off.

  FIG. 2B is a half sectional view showing the holding member in FIG. The holding member 103 used for caulking the hose in the illustrated pipe joint has an inner diameter smaller than the outer diameter of the hose in order to securely hold the hose, and insertion force when inserting the hose is large. The slits 103a are alternately formed from both sides in the axial direction so as not to increase. Further, on the inner peripheral surface of the holding member 103, a convex strip 103b is formed in the circumferential direction for biting into the outer peripheral surface of the hose and caulking the hose. The holding member 103 is usually formed by molding using a resin material.

  Among the hoses, a hose having a reinforcing layer made of a resin material has a relatively good dimensional accuracy as compared with a hose having a reinforcing layer made of a metal material and is easy to insert into a pipe joint. It was fastened by a pipe joint using a holding member 103 made of this, and such a pipe joint could be used up to a pressure of about 21 MPa.

  However, since the resin holding member 103 has low hardness, a pipe joint using the resin holding member 103 can obtain sufficient caulking performance for a hose using a metal material as a reinforcing layer. There wasn't. That is, it is difficult to apply the pipe joint using the resin holding member 103 to a hose used at a higher temperature and a higher pressure.

  On the other hand, if the holding member is made of a metal material, the caulking performance can be obtained. However, the metal holding member has a high cost, and the rigidity is high, so the insertion force of the hose is increased, and one-touch. There was also a problem that the convenience of the joint was impaired. For this reason, conventionally, a one-touch joint for a hose whose reinforcing layer is made of a resin material has been put into practical use, but a one-touch joint for a hose whose reinforcing layer is made of a metal material has been difficult to put into practical use.

  Accordingly, an object of the present invention is to provide a tube that can solve the above-mentioned problems and can obtain sufficient caulking performance even when applied to a hose having a reinforcing layer made of a metal material without deteriorating the insertion property of the hose. It is to provide a joint.

  As a result of intensive studies, the present inventor has found that the above problems can be solved by improving the structure of the holding member, and has completed the present invention.

That is, the pipe joint of the present invention includes a small-diameter hole portion, and an outer cylindrical body having a large-diameter hole portion that is continuous with the small-diameter hole portion and has a larger diameter than the small-diameter hole portion,
A flange portion and a shaft portion connected to the flange portion and having a smaller diameter than the flange portion, a shaft hole is formed in the flange portion and the shaft portion, and the axial direction is formed in the large diameter hole portion of the outer cylindrical body A core body that is slidable and disposed so that the flange portion is located on the small-diameter hole portion side,
The inner diameter is larger and smaller than the outer diameter of the shaft portion of the core body, and is axially disposed between the large-diameter hole portion of the outer cylinder body and the shaft portion of the core body. A holding member arranged slidably,
A pipe joint for caulking a hose between the holding member and the shaft portion of the core body,
The holding member includes a plurality of main body portions arranged in the circumferential direction and a joint portion that joins between the main body portions. The main body portion is made of a metal material, and the joint portion is made of an elastic material. It is characterized by this.

  In the pipe joint of the present invention, the elastic material is preferably a rubber material or a resin material. In the pipe joint of the present invention, it is preferable that the holding member has 4 to 10 main body portions. Furthermore, in the pipe joint according to the present invention, it is preferable that the holding member is formed by baking the rubber material forming the joint portion on the main body portion.

  The pipe joint of the present invention is particularly useful when the hose is a laminated hose having at least one reinforcing layer and at least one of the reinforcing layers is made of a metal material.

  According to the present invention, a pipe joint capable of obtaining sufficient caulking performance even when applied to a hose having a reinforcing layer made of a metal material without deteriorating the insertability of the hose due to the above configuration. It became possible to realize.

It is a half sectional view showing an example of a pipe joint of the present invention. (A) is a half cross-sectional view showing the holding member shown in FIG. 1 taken out, and (b) and (c) are side views of the holding member shown in (a) as viewed from both axial sides. (A) of a holding member at the time of using eight main-body parts is a half sectional view, (b), (c) is the side view seen from the axial direction both sides. (A) of the other example of the holding member which concerns on this invention is a half sectional view, (b), (c) is the side view seen from the axial direction both sides. (A)-(c) is explanatory drawing which shows the state at the time of fastening the pipe joint of this invention to a hose. It is a half sectional view showing other examples of the pipe joint of the present invention. (A) is a half cross-sectional view of an example of a conventional one-touch hose pipe joint, and (b) is a half cross-sectional view showing a holding member in (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a half sectional view showing an example of the pipe joint of the present invention. As shown in the drawing, the pipe joint of the present invention includes an outer cylindrical body 10, a core body 20 disposed inside the outer cylindrical body 10 so as to be slidable in the axial direction, and the outer cylindrical body 10 and the core body 20. The holding member 30 is slidably disposed in the axial direction.

  The outer cylindrical body 10 includes a small diameter hole portion 11 and a large diameter hole portion 12 that is connected to the small diameter hole portion 11 and has a larger diameter than the small diameter hole portion 11. The core body 20 includes a flange portion 21 and a shaft portion 22 that is continuous with the flange portion 21 and has a smaller diameter than the flange portion 21, and the flange portion 21 is disposed in the large-diameter hole portion 12 of the outer cylindrical body 10. Are arranged so as to be located on the small-diameter hole 11 side. A shaft hole 23 is formed in the flange portion 21 and the shaft portion 22 of the core body 20, and the shaft hole 23 communicates with the small diameter hole of the small diameter hole portion 11 of the outer cylindrical body 10.

  The holding member 30 has an inner diameter larger than the outer diameter of the shaft portion 22 of the core body 20, and is disposed between the large-diameter hole portion 12 of the outer cylindrical body 10 and the shaft portion 22 of the core body 20. Then, the hose is swaged with the shaft portion 22. FIG. 2 shows a half sectional view (a) showing the holding member shown in FIG. 1 taken out, and side views (b) and (c) when the holding member shown in (a) is viewed from both axial sides. . As shown in the drawing, the holding member 30 of the present invention includes a plurality of main body portions 31 arranged in the circumferential direction and a joint portion 32 that joins between the main body portions 31, and the main body portion 31 is made of a metal material. At the same time, the joint portion 32 is made of an elastic material, so that it can be expanded and contracted and has a restoring force. Since the holding member 30 has a composite structure made of such a metal material and an elastic material, the hose has a reinforcing layer made of a metal material as compared to the conventional holding member made of only a resin material as shown in FIG. In addition to the above, sufficient caulking performance can be obtained, and the inserted hose can be reliably gripped by the elasticity of the elastic material. Therefore, it has become possible to use a one-touch type pipe joint that can be used only up to a pressure of about 21 MPa under higher temperature and pressure. Moreover, since the holding member 30 according to the present invention is easily expanded in diameter when the hose is inserted, the merit that the insertion property of the hose can be improved is also obtained.

  Specifically, the holding member 30 according to the present invention has a substantially cylindrical shape as shown in the drawing, and a plurality of, in the illustrated example, four body members 31 made of a metal material are disposed between the body portions 31. Are joined by a joint portion 32 made of an elastic material. That is, the holding member 30 according to the present invention expands and contracts when the elastic material expands and contracts in the circumferential direction. Therefore, when the width of the slits 103a provided alternately from both sides in the axial direction widens or contracts, the expanded or contracted diameter increases. Unlike the conventional holding member 103 which is made possible, the diameter of the expansion / contraction is easier. Here, although the number of the main-body parts 31 which comprise the holding member 30 is dependent also on the outer diameter of a hose, it can be 4-10 pieces, for example. If the number of the main body portions 31 is too small, the holding member 30 is difficult to expand in diameter and the hose insertability is deteriorated. If it is too large, the caulking performance of the hose is deteriorated. In addition, the holding member 30 having four main body portions 31 as shown in the drawing is suitable for a low-pressure specification pipe joint. From the viewpoint of caulking the hose in a state close to a perfect circle, the holding member 30 has 6 to 8 holding members 30. It is preferable to consist of the main-body part 31 of this. FIG. 3 shows a configuration example of the holding member when the number of main body portions is eight. In the example shown in FIGS. 2 and 3, the plurality of body portions 31 arranged in the circumferential direction are joined by the same number of joining portions 32 as the body portions 31. As shown in FIG. 4, the plurality of main body portions 31 arranged in the circumferential direction may be joined by an annular joining portion 32 extending in the circumferential direction. In the holding member 30 shown in FIG. 4, a groove 33 is provided in the circumferential direction on the outer peripheral surface of the plurality of main body portions 31, and an annular joint portion 32 is formed so as to be embedded in the groove 33. .

  There is no restriction | limiting in particular as a metal material used for the main-body part 31 of the holding member 30, The metal material normally used in a pipe joint can be used suitably. Further, as the elastic material used for the joint portion 32 of the holding member 30, a rubber material or a resin material having elasticity equivalent to that of the rubber material can be suitably used. Specific examples of the resin material include thermoplastic elastomers (TPE) such as thermoplastic polyurethane elastomers (TPU). Although there is no restriction | limiting in particular as 100% modulus (100% tensile stress) of an elastic material, For example, the range of 0.4-5.0 MPa is suitable.

  The holding member 30 may be manufactured by any method. However, when a rubber material is used as the elastic material, the main body 31 made of a metal material is manufactured by cold forging, sintering, etc. Molding is preferably performed by baking a rubber material on the main body 31 in the mold. Further, when a resin material is used as the elastic material, an insert molding technique can also be used. By using these manufacturing methods, the manufacturing cost of the holding member 30 can be reduced as compared with a metal holding member manufactured by cutting.

  As shown in the figure, the first ridge portion 31a having a sharp inner peripheral edge having an inner diameter equal to or smaller than the outer diameter of the hose is provided on the inner peripheral portion of the main body 31 of the holding member 30. And a plurality of second convex portions 31b having a flat inner peripheral top surface having an inner diameter that is equal to or larger than the inner diameter of the inner peripheral edge of the first convex portion 31a, in the circumferential direction. It is formed along. The first convex portion 31a and the second convex portion 31b are arranged on the inner peripheral portion of the main body 31 so as to be separated from each other in the axial direction. Further, as shown in the drawing, the inner peripheral portion of the main body 31 has an end located on the opening side of the large-diameter hole 12 of the outer cylindrical body 10, that is, an end on the side where the hose is inserted, An inclined surface 31c that is inclined so that the inner diameter increases as it approaches the outer end is formed. On the other hand, on the opening side of the large-diameter hole 12 of the outer cylinder 10 on the outer peripheral portion of the main body 31, that is, on the side where the hose is inserted, the outer diameter is inclined so that the outer diameter becomes smaller. An inclined surface 31d is formed.

  Further, in the joint according to the present invention, between the large-diameter hole 12 and the shaft portion 22 of the core body 20 on the opening side of the large-diameter hole 12 of the outer cylinder 10, the outer peripheral side of the holding member 30. Further, a sleeve 40 is disposed. The sleeve 40 engages with a stepped portion 12 a formed on the inner peripheral surface of the large-diameter hole portion 12 and a circumferential groove 12 b formed near the opening side end portion of the inner peripheral surface of the large-diameter hole portion 12. The movement in the axial direction is restricted by the stop ring 13 as a locking member. That is, the retaining ring 13 engaged with the circumferential groove 12b of the large-diameter hole 12 prevents the sleeve 40 from coming out from the opening of the large-diameter hole 12, and the sleeve 40 and the holding member 30 is held in the large-diameter hole 12 by the retaining ring 13. The sleeve 40 has an inclined surface 41 which is inclined on the inner peripheral portion so that the inner diameter becomes smaller toward the opening side of the large-diameter hole portion 12 of the outer cylindrical body 10, and the inclined surface 41 is the holding member 30. It can come into contact with the inclined surface 31d of the main body 31. Thus, when the holding member 30 slides in the axial direction in the sleeve 40, the holding member 30 is reduced in diameter with the contact between the inclined surface 31d and the inclined surface 41, and with the separation between the inclined surface 31d and the inclined surface 41. The diameter is expanded.

  5A to 5C are explanatory views showing a state when the pipe joint of the present invention is fastened to the hose 60. FIG. As described above, in the inner peripheral portion of the main body 31 of the holding member 30, the first convex portion 31 a having an inner diameter equal to or smaller than the outer diameter of the hose 60 and the second inner diameter equal to or larger than the inner diameter of the first convex portion 31 a. A protruding portion 31b is formed, and an inclined surface 31c having an inner diameter that increases toward the outer end is formed at the end on the side where the hose 60 is inserted. Therefore, the tip end portion of the hose 60 inserted from the opening side of the large-diameter hole portion 12 of the pipe joint toward the small-diameter hole portion 11 side first comes into contact with the inclined surface 31c of the holding member 30 and the inner circumference of the holding member 30 The holding member 30 is inserted to the side while expanding the diameter, and reaches the side surface of the flange portion 21 of the core body 20 on the opening side of the large-diameter hole portion 12 ((b) in the figure). At this time, since the restoring force of the joint portion 32 made of an elastic material acts on the expanded holding member 30, the inner circumferential edge of the first protrusion 31 a bites into the outer circumferential surface of the hose 60 by this restoring force. It will be. Thereafter, when the hose 60 inserted until it hits the flange portion 21 is pulled toward the opening side of the large-diameter hole portion 12, the inner peripheral edge bites into the outer peripheral surface of the hose 60 further, and the hose 60 comes out of the opening. To prevent. Therefore, at the time of attaching the hose, for example, even if oil or the like adheres to the outer peripheral surface of the hose, the hose is firmly fixed in the pipe joint and does not come out.

  Further, as shown in (c) of the figure, when a fluid pressure is applied to the small diameter hole portion 11 with the hose 60 inserted, the core body 20 is moved to the opening side of the large diameter hole portion 12 by this fluid pressure. The inclined surface 31d of the outer peripheral portion of the main body 31 of the holding member 30 comes into contact with the inclined surface 41 of the sleeve 40, and the holding member 30 is reduced in diameter. In addition to the first convex portion 31a, the second convex portion 31b having a flat inner peripheral top surface is formed on the inner peripheral portion of the holding member 30, so that the diameter of the holding member 30 is reduced. The second convex portion 31b bites into the outer peripheral surface of the hose 60 with a wide peripheral surface. Therefore, the hose 60 moves to the opening side while being sufficiently crimped between the holding member 30 and the shaft portion 22 of the core body 20, and the hose 60 and the pipe joint are fastened sufficiently. The fluid will not leak. As a result, the hose 60 is squeezed only by the fluid pressure applied by only one operation of insertion into the pipe joint, and is firmly fastened to the pipe joint in a one-touch manner. Therefore, according to the pipe joint of the present invention, the fastening operation can be performed very easily without the need for caulking equipment and jigs. It should be noted that the inner peripheral top surface of the second convex portion 31b is composed of a wide surface, and this wide surface bites into the outer peripheral surface of the hose 60 so as to be pressed, so that the outer peripheral surface of the hose 60 is damaged or damaged. There is nothing.

  Further, when the hose 60 is inserted between the holding member 30 of the pipe joint and the shaft portion 22 of the core body 20 and the hose 60 and the pipe joint are engaged, the hose 60 is also removed from the core body 20. Since it can also rotate with respect to the tubular body 10, when connecting the pipe joint to the high-pressure fluid equipment, the pipe joint can be connected to the equipment connection section without twisting the hose by rotating the outer tubular body. It is possible to connect by screwing. Furthermore, even after the hose 60 and the pipe joint are fastened, the hose 60 can rotate with respect to the outer cylinder 10 together with the sleeve 40 in a state where the internal pressure is unloaded, so that the outer cylinder can be rotated. Thus, it is possible to connect the pipe joint by screwing it into the connecting portion of the device without twisting the hose.

  Examples of the hose 60 to which the pipe joint of the present invention is applied include a laminated hose having at least one layer, for example, 2 to 6 reinforcing layers. In the illustrated example, the inner tube 61, the reinforcing layer 62, and the outer jacket 63 are sequentially laminated from the inner layer side to the outer layer side to have a composite structure. The pipe joint of the present invention can be applied to both a low-pressure hose having a reinforcing layer made of a resin material and a high-pressure hose having a reinforcing layer made of a metal material, and in particular, a reinforcing layer made of a metal material. Even when applied to a high-pressure hose having at least one layer, there is a great merit in that sufficient caulking performance can be obtained. In addition, the pipe joint of the present invention can be applied to both a resin hose using a resin material and a rubber hose using a rubber material as a material for the inner tube 61 and the outer jacket 63, as well as a resin material and a rubber material. Can also be applied to hoses used in different layers. Specific examples of materials applied to the inner tube 61 and the outer jacket 63 include nylon resin, polyurethane rubber, polyester resin, chloroprene rubber (CR), ethylene propylene rubber (EPDM), butadiene rubber (BR), and styrene. Examples thereof include rubber (SBR), polyurethane resin, and nitrile rubber (NBR). Specific examples of the material applied to the reinforcing layer 62 include steel and polyester fiber.

  In the pipe joint shown in the figure, an O-ring 25 is fitted in a circumferential groove 24 formed on the outer peripheral surface of the flange portion 21 of the core body 20. The space between the outer cylindrical body 10 and the core body 20 is sealed in close contact with the inner peripheral surface of the diameter hole portion 12. Further, an O-ring 27 is also fitted in a circumferential groove 26 formed on the outer peripheral surface of the shaft portion 22 of the core body 20 at a position facing the second convex portion 31 b of the holding member 30. The ring 27 is in close contact with the inner peripheral surface of the inserted hose and seals between the hose and the core body 20.

  Here, when the hose to be fastened is a resin hose, an O-ring 27 is generally used for sealing between the hose and the core body 20, but in the case of a rubber hose, FIG. As shown in FIG. 4, the shaft portion 52 is formed in a sawtooth cross section by using the core body 50 having an outer diameter slightly larger than the inner diameter of the hose so that an O-ring is not used. It is possible to achieve both hose insertion performance and sealing performance. Further, when used at a high pressure, as shown in the drawing, it is preferable to further improve the sealing performance by disposing a backup ring 28 in the circumferential groove 24 on the outer peripheral surface of the flange portion 21 of the core body 20. .

DESCRIPTION OF SYMBOLS 10 Outer cylinder body, 11 Small diameter hole part, 12 Large diameter hole part, 12a Step part, 12b Circumferential groove, 13 Stop ring, 20 Core body, 21 Flange part, 22 Shaft part, 23 Shaft hole, 24 Circumferential groove, 25 O-ring, 26 circumferential groove, 27 O-ring, 28 backup ring, 30 holding member, 31 main body, 31a first ridge, 31b second ridge, 31c inclined surface, 31d inclined surface, 32 joint , 33 groove, 40 sleeve, 41 inclined surface, 50 core body, 52 shaft portion, 60 hose, 61 inner tube, 62 reinforcing layer, 63 outer cover, 101 outer cylinder body, 102 core body, 102a flange portion, 103 holding member , 103a slit, 103b ridge, 104 sleeve, 105, 106 O-ring, 107 holder

Claims (5)

A small-diameter hole, and an outer cylinder having a large-diameter hole connected to the small-diameter hole and having a larger hole diameter than the small-diameter hole,
A flange portion and a shaft portion connected to the flange portion and having a smaller diameter than the flange portion, a shaft hole is formed in the flange portion and the shaft portion, and the axial direction is formed in the large diameter hole portion of the outer cylindrical body A core body that is slidable and disposed so that the flange portion is located on the small-diameter hole portion side,
The inner diameter is larger and smaller than the outer diameter of the shaft portion of the core body, and is axially disposed between the large-diameter hole portion of the outer cylinder body and the shaft portion of the core body. A holding member arranged slidably,
A pipe joint for caulking a hose between the holding member and the shaft portion of the core body,
The holding member includes a plurality of main body portions arranged in the circumferential direction and a joint portion that joins between the main body portions. The main body portion is made of a metal material, and the joint portion is made of an elastic material. A pipe joint characterized by that.   The pipe joint according to claim 1, wherein the elastic material is a rubber material or a resin material.   The pipe joint according to claim 1 or 2, wherein the holding member has 4 to 10 main bodies.   The pipe joint according to claim 2 or 3, wherein the holding member is formed by baking the rubber material forming the joint portion on the main body portion.   The pipe joint according to any one of claims 1 to 4, wherein the hose is a laminated hose having at least one reinforcing layer, and at least one of the reinforcing layers is made of a metal material.

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