JP6478476B2 - Connector connection structure and connector connection method - Google Patents

Description

The present invention relates to a connection structure between a tube and a connector, and a connection method .

  Patent Documents 1 to 3 describe that a tube made of a thermoplastic resin is inserted into an annular groove formed on the end face of the connector, and the connector and the tube are connected by spin welding. Patent Document 4 describes that a tube made of a thermoplastic resin is extrapolated to an annular convex portion or a spiral convex portion formed on the outer peripheral surface of a connector, and the connector and the tube are connected by spin welding. ing. Patent Document 5 describes that an annular convex portion is formed for spin welding of components that are not connectors.

Japanese Patent No. 3547764 Japanese Patent No. 3523172 JP 2012-67867 A JP 2003-166585 A Japanese Patent No. 4505945

  When the tube is spin-welded in the annular groove as in Patent Documents 1 to 3, since the tube and the annular groove are in contact over the entire circumference, the stress applied to the tube is reduced. For this reason, the time until the welded surface of the tube and the connector is melted becomes longer, which causes thermal degradation of the tube. Furthermore, since the tube is scraped by the connector until the welded surface of the tube and the connector is melted, the longer the time until the welded surface of the tube and the connector is melted, the more the shaving (burr) of the tube becomes. Become more. The shaving of the tube causes a decrease in the connection force between the tube and the connector.

  Also, as in Patent Document 4, when the annular convex portion is formed in the connector and spin welding is performed while pressing the tube into the connector (moving in the axial direction), at each moment, the tube Only one place in the circumferential direction of the inner peripheral surface of the connector is in contact with the annular convex portion of the connector. Therefore, it takes time for the welded surfaces of the tube and the connector to melt.

  Further, when the annular protrusion is formed on the connector, and the spin welding is performed in a state where the tube is fixed to the connector in the axial direction, the tube extends over the entire circumference of the annular protrusion. It will be in contact. Therefore, the stress applied to the tube is reduced. In addition, when the spiral convex portion is formed on the connector as in Patent Document 4, it is substantially the same as the case where the annular convex portion is formed on the connector.

The present invention relates to a connector connection structure and a connector that can further reduce the time until the welding surface of the tube and the connector is melted, thereby suppressing the thermal deterioration of the tube and suppressing the occurrence of shaving (burr) of the tube. It aims at providing the connection method .

Connector connection structure, a tube made of thermoplastic resin, wherein the tube is a connector connection structure comprising a thermoplastic resin connector that is connected by spin welding, wherein the tube is to be more deformable than the connector are formed on, the connector is formed easily thermally deteriorated from, the connector forms an annular groove which is open one axially of the connector, and includes a groove forming portion sandwiching the tube in a radial direction, the groove forming portion, the inner peripheral surface is radially outward wall of the front Symbol annular groove, provided with a welding surface which is connected to the outer peripheral surface of said tube, said welding surface is discontinuous in the circumferential direction of the connector The groove forming portion has no unevenness on the outer peripheral surface which is the radially inner wall of the annular groove.

  On the welding surface of the connector, each of the plurality of convex portions is formed discontinuously in the circumferential direction of the connector. In both cases where the spin welding is performed while the tube is moved relative to the connector in the axial direction, and the spin welding is performed with the tube fixed in the axial direction with respect to the connector, the welding surface of the connector The contact between the tube and the tube is intermittent in the circumferential direction. Accordingly, the stress applied to the tube is larger than in the conventional case. As a result, the time until the welding surfaces of the tube and the connector are melted is shortened, the thermal deterioration of the tube is suppressed, and the occurrence of shaving (burr) of the tube is suppressed.

A preferred embodiment of the connector will be described below. That is, the said connector is not limited to the following suitable aspects.
The welding surface may include the plurality of convex portions formed in an island shape that are discontinuous in the circumferential direction of the connector and discontinuous in the axial direction of the connector.

Therefore, the contact between the welding surface of the connector and the outer peripheral surface of the tube is intermittent in the circumferential direction of the connector and intermittent in the axial direction of the connector. As a result, the time until the outer peripheral surface of the tube and the welding surface of the connector are melted is surely shortened, the thermal deterioration of the tube is suppressed, and the occurrence of shavings (burrs) of the tube is suppressed.

  Moreover, it is preferable that the tip side of each of the plurality of convex portions is formed in a sharp shape. The pointed tip of each convex portion contacts the tube. Accordingly, since the stress applied to the tube becomes larger, the time until the welded surface of the tube and the connector is melted is surely shortened.

  The tip side of each of the plurality of convex portions may be provided with a seating surface. The contact between the welding surface of the connector and the tube is intermittent in the circumferential direction, but the contact area between the welding surface and the tube is increased by the seating surface. Therefore, the heat generated in each of the convex portions is easily transmitted to the tube. As a result, the time until the welding surfaces of the tube and the connector are melted is surely shortened.

  In addition, the tube has a portion where the portion inserted into the groove forming portion has a larger diameter than a portion located outside the groove forming portion, or the portion inserted into the groove forming portion is the groove forming portion. It is good that it is the same diameter as the site | part located outside.

  The central diameter of the annular groove in the radial interval is formed to be the same diameter from the axial opening side to the axial back side, and the radial interval of the annular groove is from the axial opening side to the axial back side. It may be formed identically over the entire area. Thereby, the stress applied to the tube in the axial direction is made uniform. As a result, the tube and the welding surface of the connector are uniformly welded in the axial direction.

  The radial interval between the annular grooves may be formed so as to decrease from the axial opening side toward the axial back side. The stress applied to the tube increases toward the back in the axial direction. As a result, the time until the welding surfaces of the tube and the connector are melted is surely shortened.

The connector connection method is a connector connection method for connecting a thermoplastic resin tube and a thermoplastic resin connector to which the tube is connected by spin welding, and the tube is more easily deformed than the connector. The connector is formed to be more susceptible to thermal degradation than the connector, and the connector includes an annular groove that opens in one axial direction of the connector, and a groove forming portion that sandwiches the tube in the radial direction. The groove forming portion includes a welding surface connected to the outer circumferential surface of the tube on an inner circumferential surface which is a radially outer wall of the annular groove, and the welding surface is discontinuous in the circumferential direction of the connector. A plurality of convex portions formed on the outer peripheral surface, which is the radially inner wall of the annular groove, and the weld surface is not formed on the weld surface. Inserted The outer peripheral surface of the tube are connected by spin welding. Thereby, the contact | adhesion power of the welding surface of the inner peripheral surface of a connector and the outer peripheral surface of a tube becomes large. Therefore, the time until the welding surface of the tube and the connector is melted is surely shortened.

It is an axial sectional view of the connector of a first embodiment. It is an expanded axial direction sectional view of the tube connection part of the housing of FIG. It is 2B-2B sectional drawing of FIG. 2A. It is an expanded axial sectional view of the tube connection part of the housing of 2nd embodiment. It is 3B-3B sectional drawing of FIG. 3A. It is an expanded axial direction sectional view of the tube connection part of the housing of a third embodiment. It is 4B-4B sectional drawing of FIG. 4A. It is an expanded axial direction sectional view of the tube connection part of the housing of a 4th embodiment. It is 5B-5B sectional drawing of FIG. 5A. It is an expanded axial direction sectional view of the tube connection part of the housing of a 5th embodiment. It is 6B-6B sectional drawing of FIG. 6A. It is an expanded axial direction sectional view of the tube connection part of the housing of a 6th embodiment. It is an expanded axial direction sectional view of the tube connection part of the housing of a 7th embodiment. It is an axial direction sectional view showing a tube connection part and a tube of a housing of an eighth embodiment. It is an axial direction sectional view showing a tube connection part and a tube of a housing of a ninth embodiment.

<First embodiment>
(1. Outline of the connector)
The connector 10 of the present embodiment includes a thermoplastic resin tube 20 through which fluid fuel pumped from a fuel tank is circulated in a fuel supply system of an automobile, and a fuel that distributes and supplies the supplied fluid fuel to injectors. The delivery pipe 30 is connected. By controlling the open / close state of the injector, a desired amount of fluid fuel is injected into the cylinder of the engine.

  That is, the connector 10 forms a flow path for flowing fluid fuel from one end to the other end, the tip of the tube 20 is connected to one end of the connector 10 by spin welding, and the tip of the pipe 30 is connected to the other end of the connector 10. Is inserted. In this way, the connector 10 allows fluid fuel to flow from the tube 20 side to the pipe 30 side.

  As shown in FIG. 1, the connector 10 includes a housing 50 a, a seal member 80, and a locking member 90. However, the connector 10 is not limited to the configuration shown in FIG. 1, and various known configurations can be applied to portions other than the tube connection portion 70 a described below.

  The housing 50a is made of a thermoplastic resin (for example, PA (polyamide)) and has a cylindrical shape. The housing 50 a includes a pipe insertion part 60 and a tube connection part 70 a formed integrally with the pipe insertion part 60. The pipe insertion portion 60 is located on the other end side (right side in FIG. 1) of the housing 50a, and the pipe 30 is inserted from the opening on the other end side (right side in FIG. 1) of the housing 50a. The pipe insertion portion 60 is formed with window portions 61 and 61 that penetrate in the radial direction and face each other. The pipe 30 includes an annular protrusion 31 that protrudes radially outward at a position spaced from the distal end surface. At least the annular convex portion 31 of the pipe 30 is inserted into the pipe insertion portion 60.

  The tube connecting portion 70a is located on the opening side on one end side (left side in FIG. 1) of the housing 50a, and is connected to the tube 20 by spin welding. The tube connecting portion 70a is a groove forming portion that forms an annular groove 71a that opens in one axial direction (left side in FIG. 1). The tube connecting portion 70a sandwiches the tube 20 in the radial direction at the annular groove 71a and is connected to at least one of the inner peripheral surface, the outer peripheral surface, and the end surface of the tube 20 by spin welding. Details of the tube connecting portion 70a will be described later.

  The seal member 80 is disposed in a gap between the inner peripheral surface of the pipe insertion portion 60 and the outer peripheral surface on the tip side of the annular convex portion 31 of the pipe 30. The seal member 80 is disposed between the pair of O-rings 81 and 82 that seal a gap between the inner peripheral surface of the pipe insertion portion 60 and the outer peripheral surface of the tip portion of the pipe 30, and the pair of O-rings 81 and 82 in the axial direction. The cylindrical collar member 83 is formed by a cylindrical bush 84 that regulates the axial positions of the O-rings 81 and 82 and the collar member 83.

  The locking member 90 is made of an elastically deformable resin (for example, PA (polyamide)), is formed in a C-shaped radial cross-sectional shape, and has a relatively large deformation gap between both ends of the C-shaped circumferential direction. (Slit) is provided. On the outer peripheral surface of the locking member 90, a pair of locking claw portions 91 protruding outward in the radial direction is formed. The locking claw portion 91 is inserted from the opening on the other end side (the left side in FIG. 1) of the pipe insertion portion 60, and the locking claw portion 91 is in the axial direction with respect to the window portions 61 and 61 of the pipe insertion portion 60. Lock. In this way, the locking member 90 is prevented from coming off from the pipe insertion portion 60.

  Further, the locking member 90 is formed with a slit 92 that faces the annular protrusion 31 of the pipe 30 when the pipe 30 and the pipe insertion portion 60 are connected. That is, when the pipe 30 is inserted into the pipe insertion portion 60 in a state where the locking member 90 is inserted into the pipe insertion portion 60, the annular convex portion 31 of the pipe 30 is locked to the slit 92, so that the pipe The removal of the pipe 30 from the insertion portion 60 and the locking member 90 is restricted. Note that the pipe 30 and the locking member 90 can be detached from the pipe insertion portion 60 by reducing the diameter of the locking member 90.

(2. Detailed configuration of tube connection part)
A detailed configuration of the tube connecting portion 70a will be described with reference to FIGS. 2A and 2B. An annular groove 71a that opens in one axial direction is formed in the tube connecting portion 70a. The tube 20 is inserted into the annular groove 71a, and the tube connecting portion 70a sandwiches the tube 20 in the radial direction. The tube connection part 70a and the tube 20 are connected by spin welding.

  As shown in FIG. 2A, in the portion excluding the opening of the annular groove 71a, the central diameter of the annular groove 71a is formed to have the same diameter from the axial opening side to the axial back side. Further, in the portion excluding the opening portion of the annular groove 71a, the radial interval between the annular grooves 71a is the same from the axial opening side to the axial back side. The radial interval between the annular grooves 71a is formed to be the same as or smaller than the thickness of the tube 20. In the opening of the annular groove 71a, the outer peripheral surface that is the radially inner wall of the annular groove 71a and the inner peripheral surface that is the radially outer wall are formed in a tapered shape so as to widen the radial interval. The

  The tube connecting portion 70a includes a welding surface 72a connected to the inner circumferential surface of the tube 20 by spin welding on the outer circumferential surface that is the radially inner wall of the annular groove 71a. As shown in FIG. 2A and FIG. 2B, the welding surface 72a includes a plurality of convex portions 74a through recesses 73a on the entire circumference thereof. Each of the plurality of convex portions 74 a is formed discontinuously in the circumferential direction of the connector 10 and discontinuously formed in the axial direction of the connector 10. In other words, each of the plurality of convex portions 74a is formed in an island shape. That is, the plurality of island-shaped convex portions 74a are formed in the circumferential direction, and the plurality of island-shaped convex portions 74a are formed in the axial direction.

  As shown in FIG. 2A and FIG. 2B, the tip side of each of the plurality of convex portions 74 a is formed in a sharp shape. Each of the plurality of convex portions 74a has a substantially conical shape. Each of the plurality of convex portions 74a may be formed in a cone shape other than the cone. The plurality of convex portions 74a are formed by a mold having an uneven shape. The concavo-convex shape of the mold is formed by a blasting process, a texturing process for performing a satin finish, a plating process, or the like. Therefore, the plurality of convex portions 74a are minute convex portions.

(3. Connecting method of tube connecting part and tube)
Next, a method of connecting the tube 20 to the tube connecting portion 70a by spin welding will be described with reference to FIGS. 1, 2A, and 2B. The operator brings the tube 20 into contact with the opening of the annular groove 71a of the tube connecting portion 70a. Since the inner diameter of the tube 20 is smaller than the outer diameter of the welding surface 72a of the annular groove 71a, the end surface of the tube 20 contacts the radially inner wall of the opening of the annular groove 71a.

  Subsequently, the operator moves the tube 20 to the back side of the annular groove 71a. As a result, the tube 20 undergoes a diameter expansion deformation along the tapered shape of the opening of the radially inner wall of the annular groove 71a. That is, the tube 20 moves to the inner side of the annular groove 71a while the inner peripheral surface of the tube 20 is pressed against the welding surface 72a. Subsequently, the worker rotates the connector 10 around the axis. If it does so, friction heat will generate | occur | produce between the some convex part 74a of the welding surface 72a, and the internal peripheral surface of the tube 20 extrapolated by the welding surface 72a, and both will be welded.

  Here, in the welding surface 72a, each of the plurality of convex portions 74a is formed discontinuously in the circumferential direction and the axial direction. Therefore, when performing the spin welding with the tube 20 fixed in the axial direction with respect to the tube connecting portion 70a, the contact between the welding surface 72a and the tube 20 becomes intermittent in the circumferential direction and the axial direction. Accordingly, the stress applied to the tube 20 has a very large value. As a result, the time until the tube 20 and the welding surface 72a are melted is shortened, the thermal deterioration of the tube 20 is suppressed, and the occurrence of shavings (burrs) of the tube 20 is suppressed.

  In particular, each of the plurality of convex portions 74a is formed discontinuously not only in the circumferential direction but also in the axial direction. For this reason, the stress applied to the tube 20 has a large value at each part in the axial direction in addition to a large value at each part in the circumferential direction. Therefore, in a wide range, the stress applied to the tube 20 increases, and the time until melting is further shortened.

  The welding surface 72a is formed on the radially inner wall of the annular groove 71a of the tube connecting portion 70a. Therefore, the tube 20 is sandwiched between the annular grooves 71a. Therefore, the inner peripheral surface of the tube 20 is brought into a contact state in which the inner surface of the tube 20 is reliably pressed against the welding surface 72a, so that the time until the tube 20 and the welding surface 72a are melted is shortened. Furthermore, the tube 20 is extrapolated to the welding surface 72a while being expanded in diameter. Therefore, the adhesive force between the inner peripheral surface of the tube 20 and the welding surface 72a is further increased. Accordingly, the time until the tube 20 and the welding surface 72a are melted is surely shortened.

  Furthermore, the central diameter of the radial interval of the annular groove 71a is the same, and the radial interval on the back side of the annular groove 71a is the same. Therefore, the stress applied to the tube 20 is made uniform in the axial direction. As a result, the tube 20 and the welding surface 72a are uniformly welded in the axial direction.

  Moreover, the front end side of each of the plurality of convex portions 74a is formed in a pointed shape. Therefore, each sharp tip of each of the plurality of convex portions 74 a contacts the tube 20. Accordingly, since the stress applied to the tube 20 becomes larger, the time until the tube 20 and the welding surface 72a are melted is also reliably reduced.

<First Modification of First Embodiment>
In the first embodiment, the operator performs the spin welding in a state where the tube 20 is fixed in the axial direction with respect to the tube connecting portion 70a. However, the operator can also perform the following. The operator rotates the connector 10 while inserting the tube 20 into the annular groove 71a. That is, the operator performs spin welding while moving the tube 20 relative to the annular groove 71a.

  Each of the plurality of convex portions 74a is formed discontinuously in the circumferential direction and the axial direction. Therefore, although the contact part of the tube 20 and the welding surface 72a changes sequentially, in the wide range of the tube 20, a big stress is provided to each of the some convex part 74a. Therefore, similarly to the above, the time until the tube 20 and the welding surface 72a are melted is surely shortened.

<Second Modification of First Embodiment>
In 1st embodiment, the annular groove 71a is formed in the tube connection part 70a, and the welding surface 72a is formed in the outer peripheral surface which is a radial direction inner wall of the annular groove 71a. In addition to this, the annular groove 71a may not be formed in the tube connection portion 70a, and the welding surface 72a on the outer peripheral surface may be exposed radially outward. In this case, although the tube 20 is not pinched, the inner peripheral surface of the tube 20 and the welding surface 72a which is an outer peripheral surface are connected by spin welding.

<Third Modification of First Embodiment>
In the first embodiment, the tube connection portion 70a is formed with a welding surface 72a that is a radially inner wall of the annular groove 71a. Further, a welding surface connected to the end surface of the tube 20 by spin welding may be formed on the inner end surface of the annular groove 71a. In this case, a plurality of convex portions are formed in the radial direction on the welding surface of the back end surface.

<Second embodiment>
The tube connection part 70b of the housing 50b of 2nd embodiment is demonstrated with reference to FIG. 3A and 3B. The tube connecting portion 70b includes a welding surface 72b on the outer peripheral surface which is the radially inner wall of the annular groove 71b. The welding surface 72b includes a plurality of convex portions 74b through recesses 73b on the entire circumference thereof.

  The tip side of each of the plurality of convex portions 74b includes a seating surface. Each of the plurality of convex portions 74b has a substantially truncated cone shape. Each of the plurality of convex portions 74b may be formed in a truncated cone shape other than the truncated cone.

  Thereby, the contact between the welding surface 72b and the tube 20 is intermittent in the circumferential direction and the axial direction, but the contact area between the welding surface 72b and the tube 20 is increased by the seating surface. Therefore, heat generated in each of the plurality of convex portions 74 b is easily transmitted to the tube 20. As a result, the time until the tube 20 and the welding surface 72b are melted is reliably shortened.

<Third embodiment>
The tube connection part 70c of the housing 50c of 3rd embodiment is demonstrated with reference to FIG. 4A and 4B. The tube connecting portion 70c includes a welding surface 72c on the outer peripheral surface which is the radially inner wall of the annular groove 71c. The welding surface 72c includes a plurality of convex portions 74c formed so as to extend in parallel to the axial direction of the tube connecting portion 70c by passing the recess 73c in the circumferential direction. That is, the welding surface 72c has a shape like a spur gear.

  The plurality of convex portions 74c are formed discontinuously in the circumferential direction and continuously formed in the axial direction. By forming the plurality of convex portions 74c discontinuously in the circumferential direction, the time until the tube 20 and the welding surface 72c are melted is shortened. However, as compared to the plurality of island-shaped protrusions 74a and 74b as in the above-described embodiment, the stress applied to the tube 20 by the plurality of protrusions 74c of this embodiment may be small.

<Fourth embodiment>
The tube connection part 70d of the housing 50d of the fourth embodiment will be described with reference to FIGS. 5A and 5B. The tube connecting portion 70d includes a welding surface 75d connected to the outer circumferential surface of the tube 20 by spin welding on the inner circumferential surface that is the radially outer wall of the annular groove 71d. The welding surface 75d includes a plurality of convex portions 77d through recesses 76d on the entire circumference thereof. Each of the plurality of convex portions 77d is discontinuously formed in the circumferential direction and discontinuously formed in the axial direction. In other words, each of the plurality of convex portions 77d is formed in an island shape. In this case, the same effect as described above is exhibited.

<Fifth embodiment>
The tube connection part 70e of the housing 50e of the fifth embodiment will be described with reference to FIGS. 6A and 6B. The tube connecting portion 70e includes a first welding surface 72e that is coupled to the inner circumferential surface of the tube 20 by spin welding on the outer circumferential surface that is the radially inner wall of the annular groove 71e. The 1st welding surface 72e is provided with the some convex part 74e by passing the recessed part 73e in each perimeter.

  Furthermore, the tube connecting portion 70e includes a second welding surface 75e connected to the outer circumferential surface of the tube 20 by spin welding on the inner circumferential surface that is the radially outer wall of the annular groove 71e. The second welding surface 75e is provided with a plurality of convex portions 77e through the recesses 76e on the entire circumference of each. In this case, the effect by 1st embodiment and the effect by 4th embodiment are exhibited.

<Sixth embodiment>
A tube connection portion 70f of the housing 50f according to the sixth embodiment will be described with reference to FIG. An annular groove 71f that opens in one axial direction is formed in the tube connecting portion 70f. In the portion excluding the opening of the annular groove 71f, the center diameter of the annular groove 71f in the radial direction is formed to be the same diameter from the axial opening side to the axial back side. Further, in the portion excluding the opening portion of the annular groove 71f, the radial interval of the annular groove 71f is formed so as to decrease from the axial opening side toward the axial back side. That is, the radially inner wall and the radially outer wall of the annular groove 71f are inclined so as to approach each other as they go to the axially inner side.

  The tube connecting portion 70f includes a welding surface 72f connected to the inner peripheral surface of the tube 20 by spin welding on an outer peripheral surface that is a radially inner wall inclined by the annular groove 71f. Accordingly, the stress applied to the tube 20 increases toward the back side in the axial direction of the annular groove 71f. As a result, the time until the tube 20 and the welding surface 72f are melted is shortened.

<Seventh embodiment>
The tube connection part 70g of the housing 50g according to the seventh embodiment will be described with reference to FIG. An annular groove 71g that opens in the axial direction is formed in the tube connecting portion 70g. The tube connecting portion 70g includes a raised portion 78g that protrudes over the entire circumference on the opening side of the radially inner wall. The outer diameter of the non-raised portion 79g located on the axially inner side from the raised portion 78g is smaller than the maximum outer diameter of the raised portion 78g over the entire length.

  The raised portion 78g and the non-raised portion 79g constitute a welding surface 72g connected to the inner peripheral surface of the tube 20 by spin welding. The welding surface 72g includes a plurality of convex portions 74g through recesses 73g on the entire circumference thereof. That is, the raised portion 78g and the non-raised portion 79g are each provided with a plurality of convex portions 74g.

  The protrusion height (radial protrusion amount) of the raised portion 78g with respect to the non-lifted portion 79g is sufficiently larger than the protruding height of the convex portion 74g with respect to the recess 73g. That is, this corresponds to a state in which minute irregularities are formed on the surfaces of the raised portion 78g and the non-raised portion 79g.

  Thus, the tube connection part 70g is provided with the protruding part 78g higher than the height of the convex part 74g with respect to the recess 73g on the outer peripheral surface, and the protruding part 78g constitutes a part of the welding surface 72g. And the non-raised part 79g which is a site | part with a low height with respect to the raised part 78g exists in the axial direction back | inner side of the raised part 78g. Accordingly, the stress applied to the tube 20 by the plurality of convex portions 74g in the raised portion 78g is greater than that of the non-raised portion 79g. As a result, the time until the portion of the raised portion 78g of the tube 20 and the welding surface is melted is surely shortened. Furthermore, the axially inner surface of the raised portion 78g is locked in the axial direction with respect to the tube 20. Accordingly, the coupling force between the tube 20 and the tube connecting portion 70g is increased.

<Eighth embodiment>
A method of connecting the tube 20 to the tube connection portion 70h of the housing 50h according to the eighth embodiment by spin welding will be described with reference to FIG. The tube connecting portion 70h includes a welding surface 75h connected to the outer peripheral surface of the tube 20 by spin welding on the inner peripheral surface that is the radially outer wall of the annular groove 71h.

  The operator brings the tube 20 into contact with the opening of the annular groove 71h of the tube connecting portion 70h. Since the outer diameter of the tube 20 is larger than the welding surface 75h that is the radially outer wall of the annular groove 71h, the end surface of the tube 20 abuts against the radially outer wall of the opening of the annular groove 71h.

  Subsequently, the operator moves the tube 20 to the back side of the annular groove 71h. Then, the tube 20 is deformed in a reduced diameter along the tapered shape of the opening of the radially outer wall of the annular groove 71h. That is, the tube 20 moves to the inner side of the annular groove 71h while the outer peripheral surface of the tube 20 is pressed against the welding surface 75h. Subsequently, the worker rotates the connector 10 around the axis. If it does so, friction heat will generate | occur | produce between the some convex part of the welding surface 75h, and the outer peripheral surface of the tube 20 inserted in the welding surface 75h, and both will be welded.

  Thereby, the adhesive force of the welding surface 75h of the inner peripheral surface of the tube connection part 70h and the outer peripheral surface of the tube 20 becomes large. Therefore, the time until the tube 20 and the welding surface 75h are melted is surely shortened.

<Ninth embodiment>
A method for connecting the tube 20 to the tube connection portion 70j of the housing 50j of the ninth embodiment by spin welding will be described with reference to FIG. An annular groove 71j is formed in the tube connecting portion 70j. The central diameter of the annular groove 71j in the radial direction is the same as the central diameter of the tube 20 in the thickness direction. The tube connecting portion 70j is a welding surface connected to the inner circumferential surface or the outer circumferential surface of the tube 20 by spin welding to the outer circumferential surface which is the radially inner wall of the annular groove 71j or the inner circumferential surface which is the radially outer wall. 72j and 75j.

  The tube 20 is mounted on the welding surfaces 72j and 75j of the annular groove 71j of the tube connection portion 70j while the central diameter in the thickness direction of the tube 20 is maintained at the same diameter. And the inner peripheral surface or outer peripheral surface of the tube 20 is connected to the welding surfaces 72j and 75j by spin welding. That is, when the tube 20 is mounted in the annular groove 71j, the diameter of the tube 20 is not deformed and the diameter of the tube 20 is not deformed. Therefore, manufacture by spin welding is facilitated.

DESCRIPTION OF SYMBOLS 10: Connector, 20: Tube, 30: Pipe, 31: Annular convex part, 50a-50j: Housing, 60: Pipe insertion part, 70a-70j: Tube connection part, 71a-71j: Annular groove, 72a-72c, 72e -72g, 72j, 75d-75e, 75h, 75j: welding surface, 73a-73c, 73e, 73g, 76d-76e: recess, 74a-74c, 74e, 74g, 77d-77e: convex part, 78g: protuberance 79g: non-protruding part

Claims (6)

A connector connection structure comprising a tube made of thermoplastic resin and a connector made of thermoplastic resin to which the tube is connected by spin welding,
The tube is formed to be more deformable than the connector is formed easily thermally degraded from the connector,
The connector includes a groove forming portion that forms an annular groove that opens in one axial direction of the connector, and that sandwiches the tube in the radial direction,
The groove forming portion, the inner peripheral surface is radially outward wall of the front Symbol annular groove, provided with a welding surface which is connected to the outer peripheral surface of the tube,
The welding surface comprises a plurality of protrusions formed discontinuously in the circumferential direction of the connector,
The said groove formation part is a connector connection structure by which the unevenness | corrugation is not formed in the outer peripheral surface which is a radial direction inner wall of the said annular groove .   2. The connector connection structure according to claim 1, wherein the welding surface includes the plurality of protrusions that are discontinuously formed in a circumferential direction of the connector and discontinuously in an axial direction of the connector and are formed in an island shape. The connector connection structure according to claim 1 or 2 , wherein a distal end side of each of the plurality of convex portions is formed in a sharp shape. The connector connection structure according to claim 1 or 2 , wherein a distal end side of each of the plurality of convex portions includes a seating surface.   In the tube, the part inserted into the groove forming part has a diameter larger than the part located outside the groove forming part, or the part inserted into the groove forming part is outside the groove forming part. The connector connection structure according to any one of claims 1 to 4, wherein the connector connection structure has the same diameter as that of the portion located in the position. A connector connection method for connecting a thermoplastic resin tube and a thermoplastic resin connector to which the tube is connected by spin welding,
The tube is formed so as to be more easily deformed than the connector, and is more likely to be thermally deteriorated than the connector.
The connector includes a groove forming portion that forms an annular groove that opens in one axial direction of the connector, and that sandwiches the tube in the radial direction,
The groove forming portion includes a welding surface connected to an outer peripheral surface of the tube on an inner peripheral surface which is a radially outer wall of the annular groove,
The welding surface includes a plurality of convex portions formed discontinuously in the circumferential direction of the connector,
The groove forming portion has no irregularities formed on the outer peripheral surface which is the radially inner wall of the annular groove,
The welding surface is on the outer peripheral surface of the tube to be interpolated on the welding surface, Ru are connected by spin welding, connector connection method.

Images