JP5002324B2 - Elastic hose with terminal fitting and manufacturing method thereof - Google Patents

Description

  The present invention relates to a high-pressure elastic hose used in, for example, a power steering mechanism of an automobile, and more specifically to an elastic hose with a terminal fitting provided with an insert pipe and a mounting socket as a terminal fitting.

  As an elastic hose for high pressure used in an automobile, an elastic material hose body is used in which an insert pipe is attached using an attachment socket (see, for example, FIG. 6 of Patent Document 1). In such an elastic hose for high pressure, an end of the hose body is inserted by inserting an insert pipe inside the end of the hose body and caulking a mounting socket fitted on the outer periphery of the end of the hose body toward the inside in the radial direction. It is sandwiched between the insert pipe and the mounting socket. Then, in order to ensure the integrity of the end fitting and to enhance the attachment and fixing of the insert pipe to the end of the hose body, an annular engagement groove is formed on the outer peripheral surface of the insert pipe, An orientation flange is provided, and when the mounting socket is caulked, the inward flange is fitted into the engagement groove and engaged. In addition, when the inward flange is fitted into the engagement groove, the inner peripheral end surface of the inward flange and the bottom surface of the engagement groove are in pressure contact with each other, so that the sealing performance between the hose body and the terminal fitting is improved. It is increasing.

  Specifically, after the insert pipe is passed through the mounting socket, the axially outer end side of the mounting socket is caulked, and the inward flange of the mounting socket is inserted into the engagement groove of the insert pipe to engage with the engagement groove. Combine. Then, insert the end of the hose body relatively between the insert pipe and the mounting socket, crimp the part other than the axially outer end side of the mounting socket, press the hose body against the insert pipe, It is attached to the main body.

JP 2004-52811 A

  By the way, simply sealing the inner peripheral end face of the inward flange and the bottom face of the engaging groove cannot secure a sufficient sealing property between the hose body and the terminal fitting. Therefore, for example, as described in FIG. 4 of Patent Document 1, when the protrusion is formed on the bottom surface of the engagement groove and the mounting socket is caulked, the protrusion is formed on the inner peripheral end surface of the inward flange. It is conceivable to improve the sealing performance by making the part bite. However, if such a configuration is used together with a configuration in which the straight-shaped portion of the bellows metal tube arranged as the inner layer is pushed into the engagement groove by the inward flange, a great sealing effect can be expected. Even if it is applied when the inward flange is directly fitted in the groove, it may not be possible to provide excellent sealing performance. That is, if the end of the hose body is inserted between the insert pipe and the mounting socket and the mounting socket is crimped, the axial length of the mounting socket is shortened by the amount of crimping. The outer end portion of the hose is pulled toward the hose body side. Therefore, the inward flange is slightly inclined toward the outer side in the radial direction, the inner peripheral end surface of the inward flange is inclined, and the axially outer side of the inner peripheral end surface is slightly lifted from the bottom surface of the engagement groove. If the axially outer side of the inner peripheral end face of the inward flange is lifted from the bottom surface of the engagement groove, the protrusion will be disengaged from the inner peripheral end face, and the protrusion of the protrusion on the inner peripheral end face will be loosened, resulting in reduced sealing performance. Resulting in.

  In FIG. 2 of Patent Document 1, the width of the inward flange is set larger than the width of the engagement groove, and the inner peripheral end of the inward flange is deformed to the width of the engagement groove. An engagement structure for press-fitting into the engagement groove is described. In such an engagement structure, not only the sealing function by the pressure contact between the inner peripheral end surface of the inward flange and the bottom surface of the engagement groove, but also both the axial side surfaces of the inner peripheral end portion of the inward flange and both sides of the engagement groove A sealing function due to contact with the surface can also be expected, but such a configuration is also large when used together with a configuration in which the straight shape portion of the bellows metal tube arranged as the inner layer is pushed into the engagement groove with an inward flange. A sealing effect can be expected, and even if the inward flange is directly fitted in the engagement groove, there may be cases where sufficient surface pressure cannot be secured between the inward flange and the engagement groove. obtain.

  Then, this invention aims at improving the sealing performance of the elastic hose with a terminal metal fitting by improving the adhesiveness of the inward flange of an attachment socket, and the engagement groove of an insert pipe.

  In order to achieve this object, the elastic hose with a terminal fitting of the present invention includes a hose body made of an elastic material, a mounting socket having an inward flange fitted to the outer periphery of the end of the hose body, and the hose body. And an insert pipe having an annular engagement groove on the outer peripheral surface thereof, the mounting socket being integrated with the insert pipe, and the end portion of the hose body being The inward flange is caulked radially inward so as to be sandwiched between the mounting socket and the insert pipe, and the inward flange is caulked by the mounting socket, and the inner peripheral end surface of the inward flange and the bottom surface of the engagement groove Is an elastic hose with terminal fittings that is engaged with the engagement groove so that the bottom surface of the engagement groove is When pressed against the inner peripheral end surface of the inward flange, the bottoms of both side surfaces of the engagement groove are expanded in the axial direction, and the both side surfaces are inclined so as to approach each other as they go radially outward. Is formed. Here, for example, the mounting socket or the inward flange is formed of a material harder than the insert pipe. When the mounting socket is crimped, the inner peripheral end portion of the inward flange enters the engagement groove, and the inner peripheral end surface of the inward flange contacts the bottom surface of the engagement groove. Further, when the inner peripheral end portion of the inward flange enters the engagement groove, the bottom surface of the engagement groove is pushed by the inner peripheral end surface of the inward flange, for example, so as to be crushed inward in the radial direction. Deforms inward direction. When the bottom surface of the engagement groove is deformed inward in the radial direction, the material in the vicinity of both positions in the width direction of the bottom surface of the engagement groove is pushed and displaced or plastically deformed outward in the width direction. It is deformed so that the bottom surface side of the direction side surfaces is widened. When the bottom surface side of both sides of the engaging groove is deformed so as to expand, both side surfaces of the engaging groove are inclined and the opening side of both side surfaces of the engaging groove is deformed so as to approach, for example, the inside of the inward flange. It is pressed against the axial side surface (axial end surface) or both axial side surfaces (both axial end surfaces) of the peripheral end. In this way, for example, the inner peripheral end surface of the inward flange and the bottom surface of the engagement groove, and the axial side surface of the inward flange and the side surface of the engagement groove are in pressure contact or contact.

  As the engagement groove shape in which both side surfaces of the engagement groove are inclined so as to approach each other toward the outer side in the radial direction, the bottom surface of the engagement groove is connected to both ends in the axial direction, that is, the connection portion between the bottom surface and the side surface, or It is conceivable to form a shape that gradually expands outward in the radial direction from the boundary to the center in the axial direction. Here, for example, the bottom surface of the engagement groove is formed in a cross-sectional arc shape or a cross-sectional triangle shape.

  In the elastic hose with a terminal fitting according to the present invention, the adhesion between the inward flange and the engaging groove is improved, so that the sealing performance between the terminal fitting and the hose body is improved.

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

  FIG. 1 is a perspective view of an elastic hose with a terminal fitting according to the present invention.

  The elastic hose 1 with a terminal fitting is configured by fixing and attaching a metal terminal fitting 7 to the axial end 5 of the hose body 3, and the terminal fitting 7 includes a metal insert pipe 9, And a metal mounting socket 11. The insert pipe 9 has a male screw 13 on the outer periphery of the outer end portion in the axial direction, and an annular engagement groove 15 on the outer periphery in the middle in the axial direction. The mounting socket 11 includes a sleeve-shaped socket body 17 and an inward flange 19 formed integrally with an outer end portion in the axial direction of the socket body 17 (an inner periphery of the outer end portion in the axial direction). The socket body 17 is pressed against the axial end 5 of the hose body 3 by caulking the socket body 17 radially inward at four axial positions (see symbols a, b, c, and d).

  FIG. 2 is a view for explaining the assembly process of the elastic hose 1 with terminal fittings, showing a state in which the insert pipe 9 is inserted into the mounting socket 11, and FIG. 3 is an enlarged view of the engagement groove 15 portion of FIG. FIG. 4 is a view for explaining the assembly process of the elastic hose 1 with terminal fittings, and shows a state in which the inward flange 19 of the mounting socket 11 is engaged with the engagement groove 15 of the insert pipe 9. 5 is an enlarged view of the engagement groove 15 portion of FIG.

  In order to assemble the terminal fitting 7 to the hose body 3, first, the insert pipe 9 and the attachment socket 11 are assembled. Since the inward flange 19 of the mounting socket 11 before caulking has an insertion hole that is slightly larger than the outer diameter of the insert pipe 9, the insert pipe 9 is passed through the insertion hole, and the engagement groove 15 and the inward flange are inserted. The position in the axial direction of 19 is matched. Then, the outer end portion corresponding to the inward flange 19 of the mounting socket 11 is caulked radially inward (see symbol a). Then, the inner peripheral end of the inward flange 19 enters the engagement groove 15, the inward flange 19 and the engagement groove 15 are engaged, and the insert pipe 9 and the attachment socket 11 are assembled together. In addition, the width | variety of the inner peripheral edge part of the inward flange 19 is 3.0 mm, for example, and is formed a little narrower than the width | variety of the engaging groove 15 which is 3.2 mm, for example.

  The bottom surface 21 of the engagement groove 15 before engaging with the inward flange 19 is formed between both edges in the width direction (axial direction) or the side surfaces (axial side surfaces) 23 and 25 of the bottom surface 21 and the engagement groove 15. It is formed in a triangular shape so as to gradually bulge radially outward from the connection position or boundary 27, 29 toward the center in the width direction (axial direction), but the inner peripheral end of the inward flange 19 is engaged. When entering the groove 15, it comes into contact with the inner peripheral end face 31 of the inward flange 19 (the center of the bottom face 21 comes into contact with the inner peripheral end face 31 of the inward flange 19) and is gradually pushed by the inner peripheral end face 31. It will be deformed to collapse. The inner peripheral end surface 31 is formed in a cylindrical inner surface state so that the cross-sectional shape is a straight line extending straight in the axial direction. The material of the collapsed bottom surface 21 portion plastically deforms the material in the vicinity of the connection positions 27 and 29 between the bottom surface 21 and the side surfaces 23 and 25 outward in the width direction (axial direction). The bottom surface 21 side moves outward in the width direction (axial direction). Then, the side surfaces 23 and 25 are deformed so as to be inclined inward in the width direction toward the opening side. Therefore, the opening side of the side surfaces 23 and 25 is shifted inward in the width direction, and the axial outer surface 33 of the inward flange 19 is formed. And the opening side end portions 37 and 39 of the side surfaces 23 and 25 of the engagement groove 15 are in close contact with the axial inner surface 35. When the bottom surface 21 of the engagement groove 15 is crushed, the inner peripheral end surface 31 of the inward flange 19 is also deformed into a circular arc shape having a concave center in the width direction, and the bottom surface 21 also has a cross section corresponding to the inner peripheral end surface 31. Deforms into an arc. In addition, here, the center in the width direction (mountain top) of the bottom surface 21 reaches the same height as the opening side end portions 37 and 39 of the side surfaces 23 and 25 of the engagement groove 15.

  FIG. 6 is a view for explaining the assembly process of the elastic hose 1 with terminal fittings, and shows a state in which the end 5 of the hose body 3 is inserted between the mounting socket 11 and the insert pipe 9. It is a figure explaining the assembly | attachment process of the elastic hose 1 with a terminal metal fitting, and is a figure which shows the state which fixed the attachment socket 11 and fixed the terminal metal fitting 7 to the hose main body 3. FIG.

  When the insert pipe 9 and the attachment socket 11 are assembled, the end portion 5 of the hose body 3 is relatively inserted between the insert pipe 9 and the attachment socket 11. The hose body 3 has a configuration in which a reinforcing fiber layer 45 is disposed between the outer rubber layer 41 and the inner rubber layer 43, for example. Further, the inner end portion in the axial direction of the socket body 17 is formed so as to gradually increase in diameter toward the inner side in the axial direction, thereby constituting an insertion guide. The hose body 3 is inserted until, for example, the axial outer end surface of the hose body 3 contacts the axial inner surface 35 of the inward flange 19. Next, the socket body 17 of the mounting socket 11 is caulked inward in the radial direction, and the hose body 3 is sandwiched between the insert pipes 9. The caulking of the socket body 17 here is performed at three locations b, c, and d on the inner side in the axial direction from the outer end a. The end portion 5 of the hose body 3 is pressed against the outer peripheral surface of the insert pipe 9 by caulking of the socket body 17, but the outer peripheral portion of the insert pipe 9 to which the end portion 5 of the hose body 3 is pressed is formed in a corrugated shape. A retaining portion 47 is configured. Here, the insertion guide is slightly caulked along the outer peripheral surface of the hose body 3.

  When the socket body 17 of the mounting socket 11 is caulked, the inward flange 19 is inclined inward in the axial direction toward the radially outer side, and the axially outer side of the inner peripheral end surface 31 of the inward flange 19 is the engagement groove. 15, the axially inner surface 35 of the inward flange 19 is more strongly pressed against the opening side end portion 39 of the side surface 25 located on the axially inner side of the engagement groove 15. Therefore, the sealing performance between the inward flange 19 and the engagement groove 15 is not greatly deteriorated.

  As shown in FIG. 8, the bottom surface 21 of the engagement groove 15 is connected to both edges in the width direction (axial direction) or to the side surfaces (axial side surfaces) 23 and 25 of the bottom surface 21 and the engagement groove 15. It may be formed in a circular arc shape that gradually bulges radially outward from the position or boundary 27, 29 toward the center in the width direction (axial direction). Also in this case, the center of the bottom surface 21 in the width direction (the most radially outer portion) reaches the same height as the opening side end portions 37 and 39 of the side surfaces 23 and 25 of the engagement groove 15.

  As described above, the elastic hose with a terminal fitting according to the present invention has an excellent sealing effect, and thus can be used for piping for high-pressure fluids such as automobiles.

It is a perspective view of the elastic hose with a terminal metal fitting concerning the present invention. It is a figure explaining the assembly | attachment process of the elastic hose with a terminal metal fitting, and is a figure which shows the state which inserted the insert pipe through the attachment socket. It is an enlarged view of the engaging groove part of FIG. It is a figure explaining the assembly | attachment process of the elastic hose with a terminal metal fitting, and is a figure which shows the state which engaged the inward flange of the attachment socket with the engagement groove | channel of the insert pipe. It is an enlarged view of the engaging groove part of FIG. It is a figure explaining the assembly | attachment process of the elastic hose with a terminal metal fitting, and is a figure which shows the state which inserted the edge part of the hose main body between the attachment socket and the insert pipe. It is a figure explaining the assembly | attachment process of the elastic hose with a terminal metal fitting, and is a figure which shows the state which attached the attachment socket and fixed the terminal metal fitting to the hose main body. It is a figure which shows the modification of an engaging groove.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic hose with terminal fitting 3 Hose body 9 Insert pipe 11 Mounting socket 15 Engaging groove 19 Inward flange 21 Bottom surface 31 Inner peripheral end surface

Claims (8)

A hose body made of an elastic material, an attachment socket having an inward flange fitted to the outer periphery of the end of the hose body, and an annular engagement groove on the outer peripheral surface inserted inside the end of the hose body The mounting socket is integrated with the insert pipe, and radially inward so that the end of the hose body is sandwiched between the mounting socket and the insert pipe. The inward flange is engaged with the engagement groove so that the inner peripheral end surface of the inward flange and the bottom surface of the engagement groove are in pressure contact with each other by caulking of the mounting socket. An elastic hose with terminal fittings,
The bottom surface of the engagement groove is shaped to gradually bulge radially outward from the boundary between the bottom surface and each side surface of the engagement groove toward the center in the axial direction, and the bottom surface of the inner circumferential end surface of the inward flange The material of the portion of the bottom surface that has been crushed by pressure contact with the bottom surface plastically deforms the material in the vicinity of the boundary between the bottom surface and each of the side surfaces toward the outside in the axial direction, and each of the side surfaces goes radially outward. An elastic hose with terminal fittings, characterized in that it is formed in a shape that is inclined so as to approach each other. The elastic hose with terminal fitting according to claim 1 , wherein an opening-side end portion of each side surface of the engagement groove is in close contact with an axial outer surface and an inner surface of the inward flange . The elastic hose with terminal fitting according to claim 1 or 2, wherein a width of an inner peripheral end portion of the inward flange is formed narrower than a width of the engagement groove. The elastic hose with a terminal fitting according to claim 1, 2 or 3 , wherein the bottom surface of the engagement groove is formed in a triangular cross section. The elastic hose with terminal fitting according to claim 1, 2 or 3 , wherein the bottom surface of the engaging groove is formed in a circular arc shape in cross section. A hose body made of an elastic material, a mounting socket fitted to the outer periphery of the end of the hose body, and an insert pipe inserted inside the end of the hose body, the mounting socket being radially inward The mounting socket and the insert pipe are integrated by crimping, and the end portion of the hose body is sandwiched between the mounting socket and the insert pipe. A manufacturing method comprising:
An annular engagement groove is formed on the outer peripheral surface, and the bottom surface of the engagement groove is formed in a shape that gradually bulges radially outward from the boundary between the bottom surface and each side surface of the engagement groove toward the center in the axial direction. Preparing said insert pipe; and
Placing the insert pipe through the mounting socket with an inward flange;
The mounting socket through which the insert pipe is passed is caulked, and the material of the bottom surface portion crushed by the pressure contact with the bottom surface of the inner peripheral end surface of the inward flange is the boundary between the bottom surface and each side surface. Plastically deforming nearby materials axially outward and engaging the inward flanges into the engagement groove until the respective side surfaces are inclined toward each other as they go radially outward; ,
With the inward flange entering the engaging groove and engaging, the end of the hose body is inserted between the insert pipe and the mounting socket to caulk the mounting socket, and the end of the hose body is A method of manufacturing an elastic hose with a terminal fitting, comprising: a step of sandwiching a portion. The terminal according to claim 6, wherein the mounting socket is caulked so that an opening-side end portion of each side surface of the engagement groove is in close contact with an axially outer surface and an inner surface of the inward flange. Manufacturing method of elastic hose with metal fittings. The method for producing an elastic hose with a terminal fitting according to claim 6 or 7, wherein a width of an inner peripheral end portion of the inward flange is formed narrower than a width of the engagement groove.

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