Hose joint metal fixture and hose assembly

Abstract

To improve productivity by facilitating caulking work.SOLUTION: In a hose joint metal fixture 10 having a nipple 22A having a hose insertion part 30 which is inserted into a hose 2, and a socket 24A attached to the nipple 22A, and forming an annular space S in which the hose 2 is inserted between the hose insertion part 30 and itself, a rotation prohibition part 34 for prohibiting the rotation of the hose 2 in the annular space S in a state that the hose 2 is inserted into the annular space S is arranged at least at either of an external peripheral face 30B of the hose insertion part 30 which forms the annular space S, or an internal peripheral face of the socket which forms the annular space S.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a hose fitting and a hose assembly. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as a piping joint fitting, there has been provided a hose joint fitting that is attached to an end of a hose in order to connect the hose to equipment or the like (see Patent Document 1). The hose coupling fitting has a nipple having a hose insertion portion (nipple side cylindrical portion) that is inserted into the hose, and a socket that is attached to the nipple and forms an annular space for inserting the hose between it and the hose insertion portion. The hose coupling fitting is attached to the end of a hose by inserting the end of the hose into the annular space formed between the outer peripheral surface of the hose insertion portion and the inner peripheral surface of the socket, and then crimping the socket with a crimping device to integrally attach the socket, the end of the hose, and the hose insertion portion of the nipple. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-181789 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when manufacturing a hose assembly product in which a pair of hose coupling fittings, each of which has a bend pipe with a bend portion in the middle in the longitudinal direction and a hose connection portion at one longitudinal end of the bend pipe, are connected by a hose, it is necessary to adjust the mounting angle to the desired angle because the pair of hose coupling fittings each have a bend portion. Therefore, when producing such a hose assembly, one end of the hose is inserted into one hose coupling fitting and crimped, and then the other end of the hose is inserted into the other hose coupling fitting and the other hose coupling fitting is rotated to adjust the mounting angle of the pair of hose coupling fittings to the desired angle and then crimped.

[0005] However, if the inner diameter of the hose is slightly larger or the outer diameter of the nipple is slightly smaller due to tolerances, the force maintaining the fit between the hose coupling fitting and the hose will be weakened when the hose is inserted into the hose coupling fitting. In particular, hoses that use an inner surface material with low friction (such as a resin material) tend to have a weaker force that maintains the fitted state. As a result, when manufacturing a hose assembly as described above, even if the hose is inserted into the hose coupling fitting and the installation angle is adjusted, the fitted state between the hose coupling fitting and the hose cannot be maintained, and the hose coupling fitting may rotate before being crimped, changing the adjusted installation angle. For this reason, it is necessary to mark the hose and hose coupling fitting in advance for alignment, and then align the fittings using the match marks before crimping, which makes the crimping process complicated and reduces productivity.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a hose coupling fitting and a hose assembly that facilitates crimping work and improves productivity by suppressing rotation of the hose relative to the hose coupling fitting when the hose is inserted into the hose coupling fitting. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, one embodiment of the present invention is a hose coupling fitting comprising a nipple having a hose insertion portion to be inserted into a hose, and a socket attached to the nipple and forming an annular space into which a hose is inserted between the nipple and the hose insertion portion, wherein at least one of the outer peripheral surface of the hose insertion portion which forms the annular space or the inner peripheral surface of the socket which forms the annular space is provided with a rotation prevention portion which prevents rotation of the hose within the annular space when the hose is inserted into the annular space. In addition, one embodiment of the present invention is characterized in that the annular space has a length along the axial direction of the hose insertion portion, and the rotation preventing portion is provided on the outer peripheral surface of the hose insertion portion or the inner peripheral surface of the socket in a portion of the length of the annular space. Moreover, one embodiment of the present invention is characterized in that the portion of the socket located on the tip side of the hose insertion portion is formed as an opening that opens up the annular space, a contact wall against which the tip of the hose abuts is provided at a base end located opposite the tip of the hose insertion portion, and the rotation preventing portion is provided on the outer peripheral surface of the hose insertion portion near the abutment wall or on the inner peripheral surface of the socket near the abutment wall. Furthermore, one embodiment of the present invention is characterized in that inner circumference ridges are provided at a plurality of circumferentially spaced locations on the outer peripheral surface of the hose insertion portion which defines the annular space, the inner circumference ridges extending in the axial direction of the hose insertion portion and biting into the inner circumference of the hose when the hose is inserted into the annular space, and the rotation prevention portion is formed in a flat pattern by the plurality of inner circumference ridges. In one embodiment of the present invention, an outer circumferential ridge is provided at a plurality of circumferentially spaced locations on the inner circumferential surface of the socket which forms the annular space, the outer circumferential ridge extending in the axial direction of the socket and biting into the outer circumferential portion of the hose when the hose is inserted into the annular space, and the rotation prevention portion is formed in a flat pattern by the plurality of outer circumferential ridges. In addition, one embodiment of the present invention is characterized in that a plurality of inner circumference protrusions are provided on the outer peripheral surface of the hose insertion portion which forms the annular space, the inner circumference protrusions being adapted to bite into the inner circumference of the hose when the hose is inserted into the annular space, and the rotation prevention portion is formed in a twill pattern by the plurality of inner circumference protrusions. In addition, one embodiment of the present invention is characterized in that an inner surface of the socket forming the annular space is provided with a plurality of outer circumferential protrusions that bite into the outer circumferential portion of the hose when the hose is inserted into the annular space, and the rotation prevention portion is formed in a twill pattern by the plurality of outer circumferential protrusions. Moreover, one embodiment of the present invention is a hose assembly comprising a pair of coupling fittings having a bend pipe having a bend portion in the middle in the longitudinal direction, a hose connection portion provided at one longitudinal end of the bend pipe, and an equipment connection portion provided at the other longitudinal end of the bend pipe, the hose connection portion including a nipple provided at the one longitudinal end and having a hose insertion portion, and a socket attached to the nipple and forming an annular space into which a hose is inserted between the nipple and the hose insertion portion, and a hose connecting the pair of hose coupling fittings via the hose insertion portions of the pair of hose coupling fittings and the socket, wherein a rotation prevention portion is provided on at least one of an outer peripheral surface of the hose insertion portion that forms the annular space or an inner peripheral surface of the socket that forms the annular space, for preventing rotation of the hose within the annular space when the hose is inserted into the annular space. Effect of the Invention

[0008] According to one embodiment of the present invention, a rotation prevention portion is provided on at least one of the outer surface of the hose insertion portion or the inner surface of the socket, which prevents the hose from rotating relative to the hose coupling when the hose is inserted into the hose coupling, making the crimping operation easier and improving productivity. Furthermore, if the rotation-preventing portion is provided on the outer peripheral surface of the hose insertion portion or the inner peripheral surface of the socket in a portion of the length of the annular space, it is only necessary to machine the rotation-preventing portion into a single portion, which is advantageous in terms of simplified manufacturing. Furthermore, if the rotation preventing portion is provided on the outer peripheral surface of the hose insertion portion closer to the abutment wall, or on the inner peripheral surface of the socket closer to the abutment wall, the hose can be smoothly inserted up to near the base end of the hose insertion portion, which is advantageous in facilitating the hose insertion operation. Furthermore, if the rotation-preventing portion is formed in a flat pattern by inner peripheral ridges that are provided at multiple circumferentially spaced locations on the outer circumferential surface of the hose insertion portion and each ridge extends in the axial direction of the hose insertion portion, the rotation-preventing portion can be formed by simple processing, which is advantageous for easily manufacturing the nipple. Furthermore, if the rotation-prevention portion is formed in a flat pattern using outer peripheral protrusions that are provided at multiple circumferentially spaced locations on the inner surface of the socket, each extending in the axial direction of the socket, the rotation-prevention portion can be formed by simple processing, which is advantageous in terms of easily manufacturing the socket. Furthermore, if the rotation-preventing portion is formed in a twill pattern using a plurality of inner peripheral protrusions provided on the outer peripheral surface of the hose insertion portion, the rotation-preventing portion can be formed by simple processing, which is advantageous in easily manufacturing the nipple. Furthermore, if the rotation-preventing portion is formed in a twill pattern using a plurality of outer peripheral protrusions provided on the inner peripheral surface of the socket, the rotation-preventing portion can be formed by simple processing, which is advantageous in terms of easily manufacturing the socket. Furthermore, when manufacturing a hose assembly using a pair of hose coupling fittings and a hose connecting the pair of hose coupling fittings, if a hose coupling fitting having a rotation prevention portion on at least one of the outer surface of the hose insertion portion or the inner surface of the socket is used, rotation of the hose relative to the hose coupling fitting when the hose is inserted into the hose coupling fitting is suppressed, making it possible to maintain the adjusted mounting angle of the pair of hose coupling fittings, which is advantageous in making the crimping work easier and improving productivity. [Brief description of the drawings]

[0009] [Figure 1]FIG. 2(A) is a front view of a hose assembly made of a pair of hose coupling fittings and a hose, and FIG. 2(B) is a side view of the hose assembly. [Diagram 2] FIG. 1 is a half-sectional front view of a hose coupling according to a first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the hose coupling according to the first embodiment taken along line AA in FIG. 2. [Figure 4] 3 is a view of the hose coupling according to the first embodiment taken along the line B in FIG. 2. [Diagram 5] 3 is a view taken along the arrow B in FIG. 2 of the hose coupling fitting according to the first embodiment. FIG. [Figure 6] 3 is another example of the AA cross-sectional view in FIG. 2 of the hose coupling fitting according to the first embodiment. [Figure 7] FIG. 4 is a half-sectional front view of a hose coupling according to a second embodiment. [Figure 8] 8 is a cross-sectional view of a hose coupling according to a second embodiment taken along line CC in FIG. 7. [Figure 9] 8 is another example of a cross-sectional view taken along line CC in FIG. 7 of the hose coupling fitting according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a hose assembly 100 of this embodiment is configured to include a pair of hose coupling fittings 10 (10A, 10B) and a hose 2 that connects the pair of hose coupling fittings 10 together. The hose assembly 100 may, for example, connect devices together to supply or drain liquid from one device to another.

[0011] The hose coupling fitting 10 (10A, 10B) comprises a bend pipe 12 having a bend portion 1202 in the middle of its longitudinal direction, a hose connecting portion 16A provided at one longitudinal end of the bend pipe 12 and to which a hose 2 is connected, and an equipment connecting portion 14 provided at the other longitudinal end of the bend pipe 12 and to which an equipment (not shown) is connected. The hose assembly 100 is arranged so that an end of a hose connection portion 16A of one hose coupling fitting 10A faces an end of a hose connection portion 16A of the other hose coupling fitting 10B, and these opposing hose connection portions 16A are connected by a hose 2. In addition, the hose coupling fitting 10A and the hose coupling fitting 10B have the same configuration, and when the hose coupling fitting 10 is written in this specification, it includes both the hose coupling fittings 10A and 10B.

[0012] The bend pipe 12 is formed by bending a pipe having a circular cross section and extending in a straight line, and has a bend section 1202 that extends in a curved shape in the middle of the extension direction of the bend pipe 12, and a first straight section 1204 and a second straight section 1206 that extend in a straight line are provided on both ends. An equipment connecting portion 14 is provided at the end of the first straight portion 1204, and a hose connecting portion 16A is provided at the end of the second straight portion 1206. In this embodiment, the axis of first straight portion 1204 and the axis of second straight portion 1206 form an angle θ1 of 90°.

[0013] The device connecting portion 14 includes a device-side large diameter portion 18 provided at the end of the first straight portion 1204 , and a piping nut 20 . The device side large diameter section 18 is provided at the tip of the first straight section 1204 , and is formed with an outer diameter larger than the outer diameter of the first straight section 1204 . The piping nut 20 has an outer periphery formed into a hexagonal prism, and its inner periphery is provided with an insertion hole 2002 into which the first straight portion 1204 is movably inserted, and an accommodating portion 2004 in which the equipment side large diameter portion 18 is accommodated. The end face of the equipment-side large diameter portion 18 engages with the wall surface at the boundary between the insertion hole 2002 and the accommodating portion 2004 , thereby preventing the piping nut 20 from falling off from the equipment-side large diameter portion 18 . A female screw 2006 having an inner diameter larger than the outer diameter of the device side large diameter portion 18 is formed on the inner periphery of the receiving portion 2004, and can be connected to the device. Therefore, the piping nut 20 is prevented from falling off from the equipment-side large diameter portion 18, and is disposed so as to be movable on the first straight portion 1204 in the direction of the bent portion 1202.

[0014] As shown in FIG. 2, the hose connecting portion 16A includes a nipple 22A provided at the end of the second straight portion 1206, and a socket 24A attached to the nipple 22A so as to be immovable in the axial direction. The nipple 22A and the socket 24A are made of metal such as mild steel, for example, STKM (carbon steel pipe for mechanical construction), free-cutting steel, carbon steel, aluminum, brass, stainless steel, etc. Furthermore, the hose coupling fitting 10 is subjected to a surface treatment such as chromate treatment in order to improve corrosion resistance and prevent adhesion of dirt.

[0015] As shown in FIG. 2, the nipple 22A is configured by coaxially arranging a flange portion 26, a contact wall 28, and a hose insertion portion 30 in the axial direction of the nipple 22A, and a flow path R is formed through the center of them. The flange portion 26 is provided in a disk shape, and is formed with an outer diameter larger than the outer diameter of the second straight portion 1206 . The abutment wall 28 is provided adjacent to the flange portion 26, and an attachment recess 32 for attaching the socket 24A is formed between the abutment wall 28 and the flange portion 26. The side surface of the abutment wall 28 on the hose insertion portion 30 side comes into contact with the tip of the hose 2 when the hose 2 is inserted into annular space S (described later) formed in the hose connecting portion 16A.

[0016] The hose insertion portion 30 is a portion to be inserted into the hose 2, and is provided so as to protrude from the abutment wall . A plurality of circumferentially extending locking uneven portions 3002 are formed on the outer peripheral surface 30B near the center in the axial direction of the hose insertion portion 30 at intervals in the axial direction. Further, a rotation prevention portion 34 is provided on the outer circumferential surface 30B of the hose insertion portion 30 close to the contact wall 28. The rotation prevention portion 34 will be described in detail later.

[0017] The socket 24A is cylindrical and is composed of a tubular mounting portion 36 and a tubular portion 38 arranged coaxially, and is attached to the nipple 22A and forms an annular space S between the hose insertion portion 30 and the socket 24A, into which the hose 2 is inserted. The mounting portion 36 is attached to the mounting recess 32 of the nipple 22A by crimping, whereby the socket 24A is joined to the nipple 22A so as to be immovable in the axial direction. When the mounting portion 36 is attached to the mounting recess 32 , the cylindrical portion 38 is positioned coaxially with the hose insertion portion 30 and radially outward of the hose insertion portion 30 . A plurality of locking projections 3802 extending in the circumferential direction are formed on the inner peripheral surface 38A of the cylindrical portion 38 at intervals in the axial direction of the socket 24A. An outer peripheral surface 38B of the tubular portion 38 is the outer peripheral surface of the socket 24A that is crimped by a crimping device (not shown).

[0018] An annular space S, into which the end of the hose 2 is inserted, is formed between the outer circumferential surface 30B of the hose insertion portion 30 of the nipple 22A and the inner circumferential surface 38A of the cylindrical portion 38 of the socket 24A. The annular space S is formed to have a length along the axial direction of the hose insertion portion 30. The portion of the socket 24A located on the side of the tip 3002 of the hose insertion portion 30 is formed as an opening 2402 that opens to the annular space S. In addition, at the base end 3004 located opposite the tip 3002 of the hose insertion portion 30, an abutment wall 28 against which the tip of the hose 2 abuts is provided as described above, and is closed by the abutment wall 28 and the mounting portion 36 of the socket 24A.

[0019] The hose 2 connects a pair of hose coupling fittings 10 via the hose insertion portions 30 and sockets 24A of the pair of hose coupling fittings 10. In this embodiment, the hose 2 is made of resin, such as polyester or nylon. Hose assemblies using a resin hose 2 are used in hydraulic equipment and machine tools, for example, and have the advantage that they are lighter and cheaper to obtain than rubber hoses. However, a resin hose 2 has lower flexibility than a rubber hose, resulting in smaller frictional forces and a smaller ability to maintain the fitted state between the hose coupling 10 and the hose 2, so it is effective to provide a rotation prevention portion 34 on the hose connecting portion 16A. The hose attached to the hose assembly as in this embodiment is one that matches the hose connecting part (nipple and socket) whose dimensions are determined by the JIS standard. The hose 2 of this embodiment matches the dimensions of the hose connecting part 16A, and can be applied if the inner diameter is about 5 mm to 50 mm, with about 50 mm being suitable, and can be applied if the outer diameter is about 6 mm to 90 mm, with about 90 mm being suitable.

[0020] Next, the rotation prevention portion 34 formed on the outer circumferential surface 30B of the hose insertion portion 30 will be described with reference to FIGS. The rotation preventing portion 34 prevents the hose 2 from rotating within the annular space S when the hose 2 is inserted into the annular space S, and is provided on the outer peripheral surface 30B of the hose insertion portion 30 that forms the annular space S.

[0021] The rotation preventing portion 34 is provided on the outer circumferential surface 30B of the hose insertion portion 30 at a portion of the annular space S in the longitudinal direction. As shown in FIG. 2, the rotation prevention portion 34 in this embodiment is provided on the outer circumferential surface 30B of the hose insertion portion 30 near the contact wall 28.

[0022] The rotation preventing portion 34 in this embodiment is configured by an inner peripheral protrusion 3402 provided on the outer peripheral surface 30B of the hose insertion portion 30. That is, as shown in Figures 3 and 4, at multiple circumferentially spaced locations on the outer circumferential surface 30B of the hose insertion portion 30 which forms the annular space S, there are provided inner peripheral protrusions 3402 which extend in the axial direction of the hose insertion portion 30 and bite into the inner peripheral portion 2A of the hose 2 when the hose is inserted into the annular space S. The multiple inner circumference protrusions 3402 are provided at intervals in the circumferential direction around the entire outer circumferential surface 30B of the hose insertion portion 30, and the rotation prevention portion 34 is formed in a flat pattern by the multiple inner circumference protrusions 3402.

[0023] The height H (FIG. 3) of the inner peripheral protrusion 3402 is determined by the specifications of the hose connecting portion 16A, i.e., the outer diameter of the nipple 22A, the inner diameter of the socket 24A, and the thicknesses of the nipple 22A and the socket 24A, but in this embodiment, a height H of 0.1 to 0.8 mm is preferable, as long as the strength of the nipple 22A can be maintained. The rotation prevention portion 34 formed in a flat pattern by the multiple inner peripheral protrusions 3402 is formed by, for example, serration processing or knurling processing, but can be formed by various conventionally known processing methods. When a hose 2 is attached to such a hose coupling fitting 10, when the hose 2 is inserted into the annular space S, the multiple inner circumference protrusions 3402 bite into the inner circumference 2A at the tip of the hose 2, and therefore, when the hose 2 attempts to rotate relative to the hose coupling fitting 10, friction is generated between the outer circumference 30B of the hose insertion portion 30 and the inner circumference 2A of the hose 2, preventing the hose 2 from rotating.

[0024] Furthermore, the rotation preventing portion 34 may be formed in another shape as long as it can prevent the rotation of the hose 2 in the annular space S with the hose 2 inserted in the annular space S, as described above. That is, as shown in FIG. 5, a plurality of inner circumference protrusions 3404 that bite into the inner circumference 2A of the hose 2 when the hose is inserted into the annular space S may be provided around the entire outer surface 30B of the hose insertion portion 30 that forms the annular space S, and the rotation prevention portion 34 may be formed in a twill pattern by the plurality of inner circumference protrusions 3404. The height of the inner periphery protrusion 3404 is preferably 0.1 to 0.8 mm, similar to the inner periphery protrusion 3402. Furthermore, the rotation prevention portion 34 formed in a twill pattern by the multiple inner periphery protrusions 3404 is formed by, for example, serration processing, but can be formed by various conventionally known processing methods.

[0025] Furthermore, as described above, the rotation prevention portion 34 may have a configuration in which the multiple inner peripheral protrusions 3402 are provided at several locations spaced apart in the circumferential direction, rather than around the entire circumference of the outer circumferential surface 30B of the hose insertion portion 30. That is, as shown in FIG. 6, three inner peripheral protrusions 3402 may be provided at equal intervals of 120° in the circumferential direction of the outer circumferential surface 30B of the hose insertion portion 30.

[0026] Next, a method for manufacturing the hose assembly 100 will be described. As shown in FIG. 1, in a hose assembly 100 of this embodiment, a hose coupling fitting 10A on one side is coupled to a hose coupling fitting 10B on the other side by rotating them by 90° about the axis of a hose connecting portion 16A. In other words, the angle θ2 formed by the first straight portion 1204 of the hose coupling fitting 10A and the first straight portion 1204 of the hose coupling fitting 10B, i.e., the installation angle θ2 between the hose coupling fitting 10A and the hose coupling fitting 10B, is 90°, and the second straight portion 1206 of the hose coupling fitting 10A, the hose 2, and the second straight portion 1206 of the hose coupling fitting 10B extend on the same axis.

[0027] First, one end of the hose 2 is inserted into the annular space S formed in the hose connecting portion 16A of one of the hose coupling fittings 10A. When the tip of the hose 2 is pushed in until it abuts against the abutment wall 28, the inner circumference 2A of the tip of the hose 2 bites into the rotation prevention portion 34, i.e., the multiple inner circumference protrusions 3402, formed on the base end 3004 of the hose insertion portion 30, and rotation of the hose 2 relative to the hose coupling fitting 10A is prevented. Once the hose 2 is inserted, the socket 24A is crimped from the radially outer side to attach one end of the hose 2 to the hose connecting portion 16A of the hose coupling fitting 10A. At this time, crimping is easy because the hose 2 does not rotate relative to the hose coupling fitting 10A.

[0028] Next, the other end of the hose 2 is inserted into the annular space S formed in the hose connecting portion 16A of the other hose coupling fitting 10B. As with the hose coupling fitting 10A, when the tip of the hose 2 is pushed in until it abuts against the abutment wall 28, the inner circumference 2A of the tip of the hose 2 bites into the rotation prevention portion 34, i.e., the multiple inner circumference protrusions 3402, formed on the base end 3004 of the hose insertion portion 30, and rotation of the hose 2 relative to the hose coupling fitting 10B is prevented.

[0029] Then, using a rotational force greater than the frictional force generated between the outer peripheral surface 30B of the hose insertion portion 30 of the hose coupling fitting 10B and the inner peripheral portion 2A of the other end of the hose 2, the hose coupling fitting 10B is rotated relative to the other end of the hose 2, and the hose connection portion 16A of the hose coupling fitting 10B is rotated and adjusted so that the hose coupling fitting 10B is at the desired angle θ2 relative to the hose coupling fitting 10A. In this embodiment, as described above, the attachment angle θ2 between the hose coupling fitting 10A and the hose coupling fitting 10B is adjusted using a protractor or the like so that it becomes 90°. After the desired angle is adjusted, the position of the hose 2 relative to the hose coupling fitting 10B is maintained even if the rotational force is released. After the position of the hose 2 is determined, the socket 24A is crimped from the radially outer side, and the other end of the hose 2 is attached to the hose connecting portion 16A of the hose coupling fitting 10B. At this time, crimping is easy because the hose 2 does not rotate relative to the hose coupling fitting 10B. When the hose assembly 100 is manufactured in the above-described order, the hose coupling fitting 10B is attached to the hose 2 attached to the hose coupling fitting 10A, so that the hose coupling fitting 10B is prevented from rotating relative to the hose 2.

[0030] In the above-described manufacturing method, the hose coupling fitting 10A is attached to the hose 2, and then the hose coupling fitting 10B is attached. However, the order may be reversed, and the hose coupling fitting 10A may be attached after the hose coupling fitting 10B.

[0031] Thus, according to the hose coupling fitting 10 of this embodiment, a rotation prevention portion 34 is provided on the outer peripheral surface 30B of the hose insertion portion 30, which suppresses rotation of the hose 2 relative to the hose coupling fitting 10 when the hose 2 is inserted into the hose coupling fitting 10, which is advantageous in facilitating the crimping operation and improving productivity. In addition, forming an uneven portion such as the rotation prevention portion 34 on the outer peripheral surface 30B of the hose insertion portion 30 strengthens the bonding force with the hose 2 and is advantageous in improving the sealing performance between the hose 2 and the hose coupling fitting 10. Furthermore, since the rotation-preventing portion 34 is provided on the outer peripheral surface 30B of the hose insertion portion 30 in a portion of the length of the annular space S, it is only necessary to machine the rotation-preventing portion 34 in a portion, which is advantageous in terms of simplified manufacturing. Furthermore, since the rotation preventing portion 34 is provided on the outer peripheral surface 30B of the hose insertion portion 30 near the abutment wall 28, the hose 2 can be smoothly inserted up to near the base end 3004 of the hose insertion portion 30, which is advantageous in facilitating the insertion operation of the hose 2. Furthermore, since the rotation prevention portion 34 is formed in a flat pattern at multiple circumferentially spaced locations on the outer circumferential surface 30B of the hose insertion portion 30 by the inner peripheral protrusions 3402 which are each provided extending in the axial direction of the hose insertion portion 30, the rotation prevention portion 34 can be formed by simple processing, which is advantageous for easily manufacturing the nipple 22A. Furthermore, since the rotation-preventing portion 34 is formed in a twill pattern using a plurality of inner peripheral protrusions 3404 provided on the outer peripheral surface 30B of the hose insertion portion 30, the rotation-preventing portion 34 can be formed by simple processing, which is advantageous in easily manufacturing the nipple 22A. In addition, when manufacturing a hose assembly 100 using a pair of hose coupling fittings 10 (10A, 10B) having a bend portion 1202 in the middle in the longitudinal direction and a hose 2 connecting the pair of hose coupling fittings 10, a hose coupling fitting 10 having a rotation prevention portion 34 provided on the outer peripheral surface 30B of the hose insertion portion 30 is used.This suppresses rotation of the hose 2 relative to the hose coupling fitting 10 when the hose 2 is inserted into the hose coupling fitting 10, making it possible to maintain the adjusted installation angle θ2 of the pair of hose coupling fittings 10 (10, 10B), which is advantageous in facilitating the crimping work and improving productivity.

[0032] In the above-described embodiment, the rotation preventing portion 34 is provided on the outer peripheral surface 30B of the hose insertion portion 30 near the abutment wall 28, but it may be provided along the entire axial direction of the hose insertion portion 30, or near the middle portion, or on the tip side. However, providing the rotation preventing portion 34 at the base end 3004 of the hose insertion portion 30 allows the hose 2 to be inserted smoothly, which is advantageous in simplifying the insertion operation of the hose 2.

[0033] (Second embodiment) The first embodiment differs in that the rotation preventing portion is provided on the outer peripheral surface of the hose insertion portion, whereas the second embodiment has the rotation preventing portion provided on the inner peripheral surface of the socket. In the following description of the embodiment, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and the description will focus on the parts that are different from the first embodiment.

[0034] As shown in FIG. 7, a hose connecting portion 16B of the present embodiment includes a nipple 22B and a socket 24B, similarly to the first embodiment. The nipple 22B does not have a rotation preventing portion 34 provided on the outer circumferential surface 30B of the hose insertion portion 30, but is otherwise similar to the nipple 22A of the first embodiment.

[0035] As in the first embodiment, the socket 24B is cylindrical and is composed of a tubular mounting portion 36 and a tubular portion 38 arranged coaxially, and is attached to the nipple 22A and forms an annular space S between the hose insertion portion 30 and the socket 24B, into which the hose 2 is inserted. Further, a rotation prevention portion 40 is provided on the inner circumferential surface of socket 24B of the present embodiment, that is, on inner circumferential surface 38A of cylindrical portion 38. As shown in FIG.

[0036] Here, the rotation prevention portion 40 formed on the inner circumferential surface 38A of the cylindrical portion 38 (the inner circumferential surface of the socket 24B) will be described with reference to FIGS. The rotation preventing portion 40 prevents the hose 2 from rotating within the annular space S when the hose 2 is inserted into the annular space S, and is provided on the inner surface 38A of the tubular portion 38 that forms the annular space S.

[0037] The rotation preventing portion 40 is provided on an inner circumferential surface 38A of the cylindrical portion 38 at a portion of the annular space S in the longitudinal direction. The rotation prevention portion 40 of this embodiment is provided on the inner circumferential surface of the cylindrical portion 38 near the contact wall 28, as shown in FIG.

[0038] The rotation prevention portion 40 of the present embodiment is configured by an outer peripheral protrusion 4002 provided on the inner peripheral surface 38A of the cylindrical portion 38. That is, as shown in FIG. 8, outer circumferential protrusions 4002 are provided at multiple circumferentially spaced locations on the inner surface 38A of the tubular portion 38 that forms the annular space S. The outer circumferential protrusions 4002 extend in the axial direction of the tubular portion 38 and bite into the outer circumferential portion 2B of the hose 2 when the hose is inserted into the annular space S. The multiple outer circumferential protrusions 4002 are provided at intervals in the circumferential direction around the entire circumference of the inner circumferential surface 38A of the tubular portion 38, and the rotation-preventing portion 40 is formed in a flat pattern by the multiple outer circumferential protrusions 4002.

[0039] The height H (FIG. 8) of the outer peripheral protrusion 4002 is determined by the specifications of the hose connecting portion 16B, i.e., the outer diameter of the nipple 22B, the inner diameter of the socket 24B, and the thicknesses of the nipple 22B and the socket 24B, but in this embodiment, as in the first embodiment, a height of 0.1 to 0.8 mm is preferable, which allows the strength of the nipple 22B to be maintained. The rotation preventing portion 40 formed in a square pattern by the plurality of outer peripheral protrusions 4002 is formed by, for example, serration processing or knurling processing, but can be formed by various conventionally known processing methods. When a hose 2 is attached to such a hose coupling fitting 10, when the hose 2 is inserted into the annular space S, the multiple outer circumferential protrusions 4002 bite into the outer circumferential portion 2B at the tip of the hose 2, and therefore, when the hose 2 attempts to rotate relative to the hose coupling fitting 10, friction is generated between the inner surface 38A of the tubular portion 38 and the outer circumferential portion 2B of the hose 2, preventing the hose 2 from rotating.

[0040] Furthermore, the rotation preventing portion 40 may be formed in another shape as long as it can prevent the rotation of the hose 2 in the annular space S with the hose 2 inserted in the annular space S as described above. In other words, a plurality of outer circumferential protrusions that bite into the outer circumferential portion 2B of the hose 2 when the hose is inserted into the annular space S may be provided around the entire circumference of the inner surface 38A of the tubular portion 38 that forms the annular space S, and the rotation-preventing portion 40 may be formed in a twill pattern (see Figure 5) by the plurality of outer circumferential protrusions. The height of the outer periphery protrusions is preferably 0.1 to 0.8 mm, similarly to the outer periphery protrusions 4002 . Furthermore, the rotation prevention portion 40 formed in a twill pattern by a plurality of outer peripheral protrusions is formed by, for example, serration processing, but can be formed by various conventionally known processing methods.

[0041] Furthermore, as described above, the rotation prevention portion 40 may have a configuration in which the outer circumferential protrusions 4002 are provided at several locations spaced apart in the circumferential direction, rather than around the entire circumference of the inner circumferential surface 38A of the tubular portion 38. That is, as shown in FIG. 9, outer peripheral protrusions 4002 may be provided at three locations evenly spaced apart at 120° intervals in the circumferential direction of the inner peripheral surface 38A of the tubular portion 38.

[0042] Thus, according to the hose coupling fitting 10 of this embodiment, a rotation prevention portion 40 is provided on the inner surface 38A of the tubular portion 38 (the inner surface of the socket 24B), which suppresses rotation of the hose 2 relative to the hose coupling fitting 10 when the hose 2 is inserted into the hose coupling fitting 10, which is advantageous in facilitating the crimping operation and improving productivity. In addition, forming an uneven portion such as the rotation-preventing portion 40 on the inner surface 38A of the tubular portion 38 strengthens the bonding force with the hose 2 and is advantageous in improving the sealing performance between the hose 2 and the hose coupling fitting 10. Furthermore, since the rotation-preventing portion 40 is provided on the inner surface 38A of the cylindrical portion 38 in a portion of the length of the annular space S, it is only necessary to machine the rotation-preventing portion 40 in a portion, which is advantageous in terms of simplified manufacturing. Furthermore, since the rotation preventing portion 40 is provided on the inner surface 38A of the tubular portion 38 near the abutment wall 28, the hose 2 can be smoothly inserted up to near the base end 3004 of the hose insertion portion 30, which is advantageous in facilitating the insertion operation of the hose 2. Furthermore, since the rotation-prevention portion 40 is formed in a flat pattern at multiple circumferentially spaced locations on the inner surface 38A of the tubular portion 38 by the outer peripheral protrusions 4002 which are each provided extending in the axial direction of the tubular portion 38, the rotation-prevention portion 40 can be formed by simple processing, which is advantageous for easily manufacturing the socket 24B. Furthermore, since the rotation-preventing portion 40 is formed in a twill pattern using a plurality of outer peripheral protrusions provided on the inner peripheral surface 38A of the tubular portion 38, the rotation-preventing portion 40 can be formed by simple processing, which is advantageous in easily manufacturing the socket 24B. In addition, when manufacturing a hose assembly 100 using a pair of hose coupling fittings 10 (10A, 10B) having a bend portion 1202 in the middle in the longitudinal direction and a hose 2 connecting the pair of hose coupling fittings 10, a hose coupling fitting 10 is used in which a rotation prevention portion 40 is provided on the inner surface 38A of the cylindrical portion 38 of the socket 24B.This suppresses rotation of the hose 2 relative to the hose coupling fitting 10 when the hose 2 is inserted into the hose coupling fitting 10, making it possible to maintain the adjusted installation angle θ2 of the pair of hose coupling fittings 10 (10A, 10B), which is advantageous in facilitating the crimping work and improving productivity.

[0043] It should be noted that the present invention is directed to preventing rotation of a hose inserted in the annular space formed between the hose insertion portion of the nipple and the socket, and is therefore not limited to hose assemblies such as those in the first and second embodiments. In other words, the present invention is widely applicable to various things having a hose connecting portion, such as hose assemblies that do not have a bend portion and hose coupling fittings that have a hose connecting portion at least on one end. [Explanation of symbols]

[0044] 2 Hose 2A inner circumference 2B Outer periphery 10 (10A, 10B) Hose coupling fittings 12 Bend Pipe 1202 Bend section 14 Equipment connection section 16A, 16B Hose connection 18 Large diameter part on the equipment side 20 Piping Nut 22A, 22B nipples 24A, 24B sockets 2402 Opening 26 Flange 28 Abutment wall 30 Hose insertion part 30B Outer surface 32 Mounting recess 34, 40 Rotation prevention part 3402 Inner ridge 3404 Inner circumference protrusion 4002 Outer periphery protrusions 36 Mounting part 38 Cylindrical section 38A Inner surface 38B Outer surface 100 Hose Assembly R flow path S Annular space

Claims

1. A hose coupling fitting comprising: a nipple having a hose insertion portion to be inserted into a hose; and a socket attached to the nipple and forming an annular space between the nipple and the hose insertion portion, into which a hose is inserted, a rotation prevention portion that prevents rotation of the hose in the annular space when the hose is inserted in the annular space is provided on at least one of an outer circumferential surface of the hose insertion portion that forms the annular space and an inner circumferential surface of the socket that forms the annular space; A hose coupling fitting comprising:

2. The annular space has a length along an axial direction of the hose insertion portion, The rotation preventing portion is provided on an outer peripheral surface of the hose insertion portion or an inner peripheral surface of the socket in a portion of the annular space in the longitudinal direction.

2. A hose coupling according to claim 1.

3. The socket portion located on the tip side of the hose insertion portion is formed as an opening that opens the annular space, a contact wall against which the tip of the hose comes into contact is provided at a base end of the hose insertion portion opposite the tip, The rotation preventing portion is provided on an outer circumferential surface of the hose insertion portion close to the abutment wall, or on an inner circumferential surface of the socket close to the abutment wall.

2. A hose coupling according to claim 1.

4. an inner peripheral projection extending in an axial direction of the hose insertion portion and engaging with an inner peripheral portion of the hose when the hose is inserted into the annular space is provided at a plurality of circumferentially spaced locations on an outer peripheral surface of the hose insertion portion that defines the annular space; The rotation preventing portion is formed in a flat pattern by a plurality of the inner peripheral protrusions.

3. A hose coupling according to claim 2.

5. an outer circumferential projection extending in an axial direction of the socket is provided at a plurality of circumferentially spaced locations on an inner circumferential surface of the socket that defines the annular space and that bites into an outer circumferential portion of the hose when the hose is inserted into the annular space; The rotation preventing portion is formed in a flat pattern by a plurality of the outer peripheral protrusions.

3. A hose coupling according to claim 2.

6. a plurality of inner peripheral portion protrusions that bite into an inner peripheral portion of the hose when the hose is inserted into the annular space are provided on an outer peripheral surface of the hose insertion portion that forms the annular space; The rotation preventing portion is formed in a twill pattern by the plurality of inner peripheral protruding portions.

3. A hose coupling according to claim 2.

7. a plurality of outer periphery protrusions are provided on an inner periphery surface of the socket that forms the annular space, the outer periphery protrusions being adapted to bite into an outer periphery of the hose when the hose is inserted into the annular space; The rotation preventing portion is formed in a twill pattern by the plurality of outer peripheral protrusions.

3. A hose coupling according to claim 2.

8. The present invention provides a hose coupling device comprising: a bend pipe having a bend portion in a longitudinal middle portion; a hose connecting portion provided at one longitudinal end of the bend pipe; and an equipment connecting portion provided at the other longitudinal end of the bend pipe; the hose connection portion includes a nipple provided at one end in the longitudinal direction and having a hose insertion portion, and a socket attached to the nipple and forming an annular space between the nipple and the hose insertion portion and into which a hose is inserted, A hose assembly including: a hose connecting the pair of hose coupling fittings via the hose insertion portions of the pair of hose coupling fittings and the socket; a rotation prevention portion that prevents rotation of the hose in the annular space when the hose is inserted in the annular space is provided on at least one of an outer circumferential surface of the hose insertion portion that forms the annular space and an inner circumferential surface of the socket that forms the annular space; 1. A hose assembly comprising:

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