JP5674865B2 - Method for manufacturing cylindrical body assembly and cylindrical body assembly - Google Patents

Description

  The present invention relates to a method of manufacturing a cylindrical body assembly and a cylindrical body assembly.

  When assembling the resin member to the joint base, a method is disclosed in which the resin member is press-fitted so as to get over the large diameter portion of the joint base using the elasticity of the resin (see Patent Document 1).

JP 2012-225384 A

  However, in the above-described conventional example, after the resin member gets over the large-diameter portion of the joint base, the end surface of the resin member collides with the end face of the joint base. This sound was so loud that the operator needed to wear earplugs. Further, the impact may cause the resin member to be broken or scattered.

  In view of the above-described facts, the present invention has an object to reduce sound and impact generated when a second tubular body made of resin is press-fitted into a first tubular body and assembled.

  The invention according to claim 1 (a method for manufacturing an assembly of cylindrical bodies) is a method in which the second cylindrical bodies made of resin are press-fitted into the first cylindrical body and assembled with each other in the press-fitting direction. A protrusion provided on at least one of the end surface of one cylindrical body and the end surface of the second cylindrical body is brought into contact with the opposing end surface.

  In the manufacturing method of the cylindrical body assembly according to claim 1, when the second cylindrical body is press-fitted into the first cylindrical body and assembled, the end face opposed to the protrusion provided on one end face Therefore, the end surfaces facing each other are prevented from colliding with each other. For this reason, the sound and impact which generate | occur | produce when pressing and assembling | attaching the 2nd resin-made cylindrical body to a 1st cylindrical body can be reduced.

  According to a second aspect of the present invention, in the manufacturing method of the cylindrical body assembly according to the first aspect, the contact state between the protrusion and the end surface is maintained after press-fitting.

  In the method for manufacturing the cylindrical body assembly according to claim 2, the contact state between the protrusion and the end surface is maintained after press-fitting, so that the first cylindrical body and the second cylindrical body are not in contact with each other. Relative positional deviation in the axial direction can be suppressed.

  According to a third aspect of the present invention, in the manufacturing method of the cylindrical body assembly according to the first or second aspect, the recess having a depth lower than the height of the protrusion is formed on the end surface facing the protrusion. It is provided corresponding to the arrangement of the protrusions, and the protrusions are brought into contact with the recesses.

  In the manufacturing method of the cylindrical body assembly according to claim 3, the relative rotation between the first cylindrical body and the second cylindrical body is achieved by engaging the protrusion and the recess in the circumferential direction. Can be suppressed.

  According to a fourth aspect of the present invention (an assembly of cylindrical bodies), a first cylindrical body, a second cylindrical body made of resin that is press-fitted and assembled to the first cylindrical body, and a press-fitting direction, When the second cylindrical body is press-fitted and assembled to at least one of the end surface of the first cylindrical body and the end surface of the second cylindrical body facing each other. And a protrusion abutting against the opposing end face.

  In the cylindrical body assembly according to claim 4, when the second cylindrical body is press-fitted and assembled to the first cylindrical body, the protrusion provided on one end surface is brought into contact with the opposing end surface. Therefore, it is suppressed that the end surfaces facing each other collide with each other. For this reason, the sound and impact which generate | occur | produce when pressing and assembling | attaching the 2nd resin-made cylindrical body to a 1st cylindrical body can be reduced.

  The invention according to claim 5 (cylindrical assembly) is the cylindrical body assembly according to claim 4, wherein the end surface facing the projection is formed to be shallower than the height of the projection. When the second cylindrical body is press-fitted and assembled into one cylindrical body, a concave portion with which the projection abuts is provided corresponding to the arrangement of the projection.

  In the cylindrical body assembly according to claim 5, the relative rotation between the first cylindrical body and the second cylindrical body is suppressed by engaging the protrusion and the concave portion in the circumferential direction. be able to.

  According to the present invention, it is possible to obtain an excellent effect that it is possible to reduce a sound and an impact generated when a second cylindrical body made of resin is press-fitted and assembled to the first cylindrical body.

1 to 7 relate to the first embodiment, and FIG. 1 is a cross-sectional view taken along the axial direction showing a state before a collar is press-fitted into a joint base. It is sectional drawing cut | disconnected along the axial direction which shows the state which press-fitted the color | collar to the coupling base | substrate. It is a perspective view which shows a color. It is an expanded sectional view which shows the contact state of the end surface of a joint base | substrate, and the protrusion of a color | collar. (A) It is a perspective view which shows the example which provided the cyclic | annular processus | protrusion in the radial direction center part of the end surface of a color | collar. (B) It is a perspective view which shows the example which provided the cyclic | annular processus | protrusion in the radial direction outer side edge part of the end surface of a color | collar. It is sectional drawing cut | disconnected along the axial direction which shows the state before press-fitting a sleeve with respect to the collar press-fitted in the joint base. It is sectional drawing cut | disconnected along the axial direction which shows the state which press-fitted the sleeve to the color | collar. 8 and 9 relate to the second embodiment, and FIG. 8 is a cross-sectional view taken along the axial direction showing a state before the collar is press-fitted into the joint base. It is sectional drawing cut | disconnected along the axial direction which shows the state which press-fitted the color | collar to the coupling base | substrate. FIGS. 10 to 13 relate to the third embodiment, and FIG. 10 is a cross-sectional view taken along the axial direction showing a state before the collar is press-fitted into the joint base. It is sectional drawing cut | disconnected along the axial direction which shows the state which press-fitted the color | collar to the coupling base | substrate. It is a perspective view which shows a color. (A) It is an expanded sectional view which shows the contact state of protrusion and an end surface. (B) It is an enlarged front view which shows the contact state of a protrusion and an end surface.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawing, the arrow A direction indicates the press-fitting direction. This press-fitting direction is parallel to the direction of the axis CL of each member.

[First Embodiment]
(Assembly of joint base and collar)
In FIG. 1, the manufacturing method of the cylindrical body assembly according to the present embodiment press-fits a collar 12 as an example of a second cylindrical body made of resin into a joint base 10 as an example of a first cylindrical body. Then, when assembling, the protrusion 20 provided on the end face 16 of the collar 12 is brought into contact with the end face 14 of the joint base 10 facing in the press-fitting direction (arrow A direction).

  The joint base 10 is formed in a cylindrical shape with a gun metal or a resin material, and a flow path 28 through which water or hot water for hot water supply or hot water passes is provided. On the outer peripheral surface of the end portion of the joint base 10, there is a screw portion 32 that is screwed into another joint member (not shown). The threaded portion 32 is a pipe taper male thread. A hexagonal portion 34 is integrally formed in the vicinity of the screw portion 32. Further, the base tube portion 18 extends in a cylindrical shape from the end face 14 of the hexagonal portion 34. Further, an inner cylinder 26 having a smaller diameter than the base cylinder part 18 is extended from the end surface of the base cylinder part 18.

  The outer peripheral surface of the base tube portion 18 is a portion into which the press-fit portion 22 of the collar 12 is fitted when the collar 12 is press-fit. A large diameter portion 24 is formed at the end of the outer peripheral surface of the base tube portion 18. The large diameter portion 24 is formed in an annular shape on the inner tube 26 side of the outer peripheral surface of the base tube portion 18. The large diameter portion 24 functions to prevent the press-fitted collar 12 from coming out.

  The inner cylinder 26 extends in the direction of the axis CL at the tip of the base cylinder portion 18. Further, the outer diameter of the inner cylinder 26 is smaller than that of the base cylinder part 18. Grooves are formed on the outer peripheral surface of the inner cylinder 26, and O-rings 30 for sealing are doubly fitted in the grooves.

  The collar 12 is formed in a cylindrical shape from a resin such as transparent nylon (for example, microcrystalline polyamide or grill amide). A press-fit portion 22 is formed on the inner surface of the collar 12. The press-fit portion 22 is provided at a press-fit side end portion (end portion in the direction of arrow A) when the collar 12 is press-fitted into the joint base 10. The inner diameter of the press-fit portion 22 is slightly smaller than the outer diameter of the large diameter portion 24 of the base tube portion 18. After the press-fit portion 22 gets over the large-diameter portion 24 and is press-fit into the base tube portion 18, the movement of the collar 12 in the direction of the axis CL is prevented by the large-diameter portion 24.

  1 and 3, the protrusions 20 are formed in, for example, a conical shape, and are integrally provided at, for example, three places on the end surface 16 of the collar 12. The protrusions 20 are evenly arranged about every 120 ° in the circumferential direction of the collar 12. The volume of the protrusion 20 is appropriately set depending on the material of the protrusion 20, the material of the end face 14 that is the opposite surface, the press-fitting load, and the like. In the front view of the end surface 16, the ratio of the projection area of the protrusion 20 on the end surface 16 is, for example, 3 to 20%. The projected area corresponds to the bottom area of the protrusion 20 at the position of the end face 16.

  As shown in FIGS. 2 and 4, the manufacturing method of the cylindrical body assembly according to the present embodiment maintains the contact state between the protrusion 20 and the end surface 14 after press-fitting. Therefore, the total L1 of the length L22 of the press-fit portion 22 and the height L20 of the protrusion 20 is set slightly longer than the length L18 of the base tube portion 18. The length L22 of the press-fit portion 22 is slightly shorter than the length L18 of the base tube portion 18. By deforming the protrusion 20 elastically or plastically during press-fitting, there is no backlash in the direction of the axis CL between the joint base 10 and the collar 12, and the contact state between the protrusion 20 and the end face 14 is maintained.

  According to the manufacturing method of the cylindrical body assembly according to the present embodiment, when the collar 12 that is the second cylindrical body is press-fitted and assembled to the joint base 10 that is the first cylindrical body, The protrusion 20 provided on the end surface 16 of the collar 12 is brought into contact with the opposite end surface 14. Therefore, the end surfaces 14 and 16 facing each other are prevented from colliding with each other. Since the area of the tip of the protrusion 20 is narrower than the area of the end face 14 that hits the end face 16 when the protrusion 20 is not present, the sound and impact when the protrusion 20 contacts the end face 16 are reduced. For this reason, the sound and impact which generate | occur | produce when press-fitting the color | collar 12 which is a resin member to the coupling base | substrate 10 can be reduced.

  In addition, since the contact state between the protrusion 20 and the end surface 14 is maintained after press-fitting, the relative displacement in the axis CL direction between the joint base 10 and the collar 12 can be suppressed.

  When the material of the end surface 14 of the joint base 10 and the material of the end surface 16 (projection 20) of the collar 12 are both resin, when the projection 20 is brought into contact with the end surface 14, at least the projection 20 and the end surface 14 One may be deformed. When the protrusion 20 is mainly deformed, it is desirable that the protrusion 20 is deformed until the height becomes about half. When the material of the end surface 14 of the joint base 10 is resin and the material of the end surface 16 (projection 20) of the collar 12 is metal, the projection 20 hardly deforms and mainly the end surface 14 deforms. When such deformation occurs, energy is absorbed accordingly. Thereby, the sound and impact which are generated when the collar 12 is assembled to the joint base 10 can be reduced.

  The contact between the protrusion 20 and the end surface 14 may be after the press-fit portion 22 has passed over the large-diameter portion 24 (after press-fit), or may be in the middle of being overtaken (press-fit). When the protrusion 20 comes into contact with the end surface 14 during the press-fitting, the press-fitting is continued while the protrusion 20 is deformed.

  The shape of the protrusion 20 is not limited to a conical shape, and may be a triangular pyramid shape, a quadrangular pyramid shape, a hemispherical shape, or the like. Further, the number and arrangement of the protrusions 20 are not limited to the illustrated example, and can be appropriately changed. For example, as shown in FIG. 5, the protrusions 20 may be formed in an annular shape having a triangular cross section. In the example shown in FIG. 5A, the annular protrusion 20 is provided at the radial center of the end face 16 of the collar 12. In the example shown in FIG. 5B, an annular protrusion 20 is provided at the radially outer end of the end face 16 of the collar 12. In FIG. 1, the height L20 of the protrusion 20 is not limited to a fixed value, and protrusions 20 having different heights L20 may be mixed.

(Assembly of collar and sleeve)
As shown in FIGS. 5 and 6, a resin sleeve 38 is press-fitted into the outer peripheral surface of the collar 12. The sleeve 38 is made of a resin material such as polyacetal (POM), for example, and covers at least a part of the outer peripheral surface of the collar 12. An enlarged diameter portion 36 is formed on the outer periphery of the substantially central portion of the collar 12 in the axial direction CL. A cylindrical tube portion 48 is formed ahead of the end surface 44 of the enlarged diameter portion 36. The outer peripheral surface of the cylindrical portion 48 is a portion where the press-fit portion 42 of the sleeve 38 is fitted when the sleeve 38 is press-fit. Large diameter portions 54 and 56 are formed in the cylindrical portion 48. The large diameter portions 54 and 56 function to prevent the press-fitted sleeve 38 from coming out.

  The sleeve 38 is formed in a cylindrical shape from resin. A press-fit portion 42 is formed on the inner surface of the sleeve 38. The press-fit portion 42 is provided at a press-fit side end portion (end portion in the direction of arrow A) when the sleeve 38 is press-fitted into the collar 12. The inner diameter of the press-fit portion 42 is slightly smaller than the outer diameter of the large diameter portions 54 and 56 of the collar 12. Grooves 64 and 66 that engage with the large diameter portions 54 and 56 of the collar 12 are formed in the press-fit portion 42.

  As shown in FIG. 6, in the direction of the axis CL, the total length L2 of the press-fit portion 42 from the end face 46 of the sleeve 38 to the groove 64 and the height L60 of the protrusion 60 is It is longer than the length L48 of the cylinder part 48 from the end surface 44 to the large diameter part 54. Further, the length L42 of the press-fit portion 42 is shorter than the length L48. After the press-fit portion 42 has passed over the large-diameter portions 54 and 56 and is press-fit into the collar 12, the movement of the sleeve 38 in the direction of the axis CL is prevented by the large-diameter portions 54 and 56.

  The end face 46 of the sleeve 38 faces the end face 44 of the collar 12 in the press-fitting direction (arrow A direction). A projection 60 is provided on the end face 46. The shape and height of the protrusion 60 are the same as those of the protrusion 20 of the collar 12.

  As shown in FIGS. 6 and 7, in the manufacturing method of the cylindrical body assembly according to the present embodiment, the collar 12, which is an example of the first cylindrical body, has a second cylindrical body made of resin. When the sleeve 38 as an example is press-fitted and assembled, the protrusion 60 provided on the end face 46 of the sleeve 38 is brought into contact with the end face 44 of the collar 12 facing in the press-fitting direction (arrow A direction). Further, the contact state between the protrusion 60 and the end surface 44 is maintained after press-fitting. At least one of the protrusion 60 and the end surface 44 may be deformed.

  Therefore, the end surfaces 44 and 46 facing each other are prevented from colliding with each other. For this reason, it is possible to reduce the sound and impact generated when the sleeve 38, which is a resin member, is press-fitted and assembled. Further, since the contact state between the protrusion 60 and the end surface 44 is maintained after press-fitting, a relative positional shift in the axis line CL direction between the collar 12 and the sleeve 38 can be suppressed.

  In this way, the pipe joint 52 is configured. The pipe joint 52 includes a joint base 10 (first cylindrical body), a resin collar 12 (second cylindrical body) that is press-fitted into the joint base 10 and a joint facing each other in the press-fitting direction. And a projection 20 that is provided on at least one of the end face 14 of the base 10 and the end face 16 of the collar 12 and abuts against the facing end face 14 when the collar 12 is press-fitted and assembled to the joint base 10. The pipe joint 52 may further incorporate other parts.

[Second Embodiment]
8 and 9, in the method of manufacturing the cylindrical body assembly according to the present embodiment, the protrusion 70 provided on the end surface 14 of the joint base 10 is brought into contact with the end surface 16 of the collar 12. In this method, at least one of the end faces 16 is deformed. The structure of the protrusion 70 is the same as that of the protrusion 20 according to the first embodiment.

  Moreover, the manufacturing method of the assembly of the cylindrical body which concerns on this embodiment maintains the contact state of the processus | protrusion 70 and the end surface 16 after press-fit. Therefore, the length L22 of the press-fit portion 22 in the direction of the axis CL is set larger than the length L3 obtained by removing the height L70 of the protrusion 70 from the length L18 of the base tube portion 18 and shorter than the length L18. Yes. By elastically or plastically deforming the protrusion 70 during the press-fitting, there is no backlash in the direction of the axis CL between the joint base 10 and the collar 12, and the contact state between the protrusion 70 and the end face 16 is maintained.

  When the material of the projection 70 of the joint base 10 is metal and the material of the end surface 16 of the collar 12 is resin, the projection 70 hardly deforms and mainly the end surface 16 deforms. Conversely, when the material of the projection 70 of the joint base 10 is resin and the material of the end face 16 of the collar 12 is metal, the projection 70 is mainly deformed. When the material of the protrusion 70 of the joint base 10 and the material of the end face 16 of the collar 12 are resins having equivalent characteristics, both the protrusion 70 and the end face 14 are deformed.

  Since other matters are the same as those of the first embodiment, the same parts are denoted by the same reference numerals, and description thereof is omitted.

[Third Embodiment]
10 to 13, in the manufacturing method of the cylindrical body assembly according to the present embodiment, the end surface 14 facing the protrusion 20 is provided with a recess 58 having a depth L58 lower than the height L20 of the protrusion 20. The protrusion 20 is brought into contact with the recess 58. As shown in FIG. 12, the protrusion 20 has a triangular ridgeline shape extending in the radial direction of the collar 12. Further, the protrusions 20 are integrally provided at, for example, four places on the end surface 16 of the collar 12. The protrusions 20 are arranged every about 90 ° in the circumferential direction of the collar 12.

  As shown in FIG. 10, the recess 58 has a groove shape with a rectangular cross section extending in the radial direction of the joint base 10, for example. Corresponding to the arrangement of the protrusions 20, the recesses 58 are arranged evenly every about 90 ° in the circumferential direction of the joint base 10. When the protrusion 20 is annular (see FIG. 5), the recess 58 is also annularly formed accordingly.

  As shown in FIG. 11, in the manufacturing method of the cylindrical body assembly according to the present embodiment, when the collar 12 is press-fitted into the joint base 10, the protrusion 20 and the recess 58 are engaged in the circumferential direction. Thus, relative rotation between the joint base 10 that is the first cylindrical body and the collar 12 that is the second cylindrical body can be suppressed. Moreover, it is suppressed that the end surfaces 14 and 16 which mutually oppose collide on a surface. Since the energy is absorbed by the deformation of the protrusion 20, it is possible to reduce the sound and impact generated during press-fitting.

  As shown in FIGS. 13A and 13B, the method of manufacturing the cylindrical body assembly according to the present embodiment maintains the contact state between the protrusion 20 and the recess 58 after press-fitting. When the protrusions 20 are crushed and deformed during press-fitting, there is no backlash in the direction of the axis CL between the joint base 10 and the collar 12, and the contact state between the protrusions 20 and the recesses 58 is maintained. In addition, in order to suppress generation | occurrence | production of the sound by which the end surfaces 14 and 16 which oppose contact | abut, it is desirable to ensure the clearance C between them.

  In this way, the pipe joint 62, which is an example of an assembly of cylindrical bodies, is configured. The pipe joint 62 is formed on the end surface 14 facing the protrusion 20 so as to be shallower than the height of the protrusion 20, and presses the collar 12 (second cylindrical body) into the joint base 10 (first cylindrical body). When assembling, a recess 58 with which the projection 20 abuts is provided.

  Since other matters are the same as those of the first embodiment, the same parts are denoted by the same reference numerals, and description thereof is omitted.

[Other Embodiments]
Contact state between the projection 20 and the end surface 14 (FIGS. 2 and 4), contact state between the projection 60 and the end surface 44 (FIG. 7), contact state between the projection 70 and the end surface 16 (FIG. 9), and projection Although the contact state (FIGS. 11 and 13) between 20 and the recess 58 is maintained after press-fitting, the contact state does not necessarily have to be maintained.

10 joint base (first cylindrical body), 12 collar (second cylindrical body, first cylindrical body), 14 end face, 16 end face, 20 protrusion, 38 sleeve (second cylindrical body), 46 End face, 52, pipe joint (cylindrical assembly), 58 recess, 60 protrusion, 62 pipe joint (cylindrical assembly), 70 protrusion

Claims (5)

  When the second cylindrical body made of resin is press-fitted and assembled to the first cylindrical body, the end surface of the first cylindrical body and the end surface of the second cylindrical body facing each other in the press-fitting direction A method for manufacturing an assembly of cylindrical bodies, wherein a protrusion provided on at least one of the ends is brought into contact with the opposing end surface.   The manufacturing method of the assembly of the cylindrical body of Claim 1 which maintains the contact state of the said protrusion and the said end surface after press-fitting.   The cylinder according to claim 1 or 2, wherein a concave portion shallower than the height of the projection is provided on the end face facing the projection in correspondence with the arrangement of the projection, and the projection is brought into contact with the concave portion. A method for manufacturing a body-like assembly. A first tubular body;
A second cylindrical body made of resin that is press-fitted into the first cylindrical body and assembled;
Provided on at least one of the end surface of the first cylindrical body and the end surface of the second cylindrical body facing each other in the press-fitting direction, and press-fitting the second cylindrical body into the first cylindrical body. When assembling, a protrusion abutting against the facing end face,
An assembly of cylindrical bodies having   The end face facing the protrusion is formed shallower than the height of the protrusion, and a recess is disposed in which the protrusion abuts when the second cylindrical body is press-fitted into the first cylindrical body. The assembly of the cylindrical body according to claim 4 provided corresponding to.

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