JP2009036286A - Member joining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently join fitted joints of hollow members having different cross-sections. <P>SOLUTION: The inner hollow member 12 is fitted to the outer hollow member 11 so that an outer surface of a first part 3a of the inner hollow member comes into contact with an inner surface of a first part 1a of the outer hollow member 11, and an auxiliary member 13 is inserted through screw holes 2a, 4a, a hole 4b and a screw hole 2b. Material originating from an end portion of the auxiliary member 13 is formed by frictional heat and plastic flow to catch the inner hollow member 12 and the adjacent outer hollow member 11 in a thickness direction and to enter grooves of the screw holes 2a, 4a, and material originating from the other end of the same auxiliary member 13 is formed by frictional heat and plastic flow to catch the outer hollow member 11 in the thickness direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a member joining structure.

  Friction stir welding is a method for connecting members to be joined together without melting them (see, for example, Patent Document 1).

  In this technique, the object to be joined is placed on a support tool that is a backing member, and the material that has been softened by frictional heat and plastic flow is pressed against the object while rotating the joining tool. Agitate to assimilate.

  Next, the part to which the material is assimilated is cured by separating the joining tool from the object to be joined, and the members to be joined are joined to each other.

  The joining tool includes a columnar shoulder portion and a pin portion that is coaxial with the shoulder portion and projects toward the tip of the tool and has a smaller outer diameter than the shoulder portion.

In addition, there has already been proposed a method of manufacturing a structure by arranging two hollow extruded shapes made of an aluminum alloy and integrating the shapes by friction stir welding (see, for example, Patent Document 2). .
JP 2004-136365 A JP 2002-137071 A

  However, there has been no method for efficiently joining the joint in which the inner hollow member is fitted to the outer hollow member.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to enable efficient joining of joints fitted with hollow members having different cross-sectional shapes.

  In order to achieve the above object, according to the first aspect of the present invention, the outer hollow member formed so as to face the hole for inserting the auxiliary member and the inner side formed so as to face the hole for inserting the auxiliary member. A hollow member and an auxiliary member long enough to be inserted into both of the holes of the outer hollow member, the outer surface of the inner hollow member abutting against the inner surface of the outer hollow member, and each auxiliary member insertion The inner hollow member is fitted to the outer hollow member so that the holes are positioned coaxially, the auxiliary member is inserted into each hole, and the material derived from one end portion of the auxiliary member is subjected to frictional heat and plastic flow to form the inner hollow member. The outer hollow member adjacent to the outer member is shaped so as to be sandwiched in the thickness direction, and the material derived from the other end portion of the auxiliary member is shaped so as to sandwich the outer hollow member in the thickness direction by frictional heat and plastic flow. Take.

  According to the second aspect of the present invention, the outer hollow member formed so as to face the auxiliary member insertion hole, the inner hollow member formed so as to face the auxiliary member insertion hole, and the outer hollow member. An auxiliary member long enough to be inserted into both holes of the member, the outer surface of the inner hollow member abuts the inner surface of the outer hollow member, and the holes for inserting the auxiliary members are positioned coaxially. The inner hollow member is fitted into the outer hollow member, the auxiliary member is inserted into each hole, and the material derived from one end portion of the auxiliary member is adjacent to the inner hollow member by frictional heat and plastic flow. A structure is adopted in which the outer hollow member is assimilated and the material derived from the other end portion of the auxiliary member is assimilated into the outer hollow member by frictional heat and plastic flow.

  In the invention according to claim 3, the outer hollow member formed so as to face the auxiliary member insertion hole, the inner hollow member formed so as to face the auxiliary member insertion hole, and the outer hollow member An auxiliary member long enough to be inserted into both holes of the member, the outer surface of the inner hollow member abuts the inner surface of the outer hollow member, and the holes for inserting the auxiliary members are positioned coaxially. The inner hollow member is fitted into the outer hollow member, the auxiliary member is inserted into each hole, and the material derived from one end portion of the auxiliary member is assimilated to the outer hollow member by frictional heat and plastic flow, and adjacent thereto. The inner hollow member is shaped so as to be sandwiched in the thickness direction, and the material derived from the other end portion of the auxiliary member is assimilated to the outer hollow member by frictional heat and plastic flow.

  In the invention according to claim 4, an outer hollow member formed so as to face the auxiliary member insertion hole, an inner hollow member formed so as to face the auxiliary member insertion hole, and the outer hollow member An auxiliary member having a length sufficient to be inserted into both of the holes, and a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member. The outer surface on the opposite side is in contact with the inner surface of the outer hollow member, and the inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxial, and the auxiliary member is fitted to each hole and nut. The material derived from one end portion of the auxiliary member is formed so as to sandwich the inner hollow member and the outer hollow member adjacent thereto by frictional heat and plastic flow in the thickness direction, and derived from the other end portion of the auxiliary member. Material With shaped to sandwich the outer hollow member in the thickness direction by heat and plastic flow, a configuration that is filled in the thread groove of the nut.

  In the invention according to claim 5, the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the outer hollow member An auxiliary member having a length sufficient to be inserted into both of the holes, and a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member. The outer surface on the opposite side is in contact with the inner surface of the outer hollow member, and the inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxial, and the auxiliary member is fitted to each hole and nut. The material derived from one end portion of the auxiliary member is assimilated into the inner hollow member and the outer hollow member adjacent thereto by frictional heat and plastic flow, and the material derived from the other end portion of the auxiliary member is rubbed. By heat and plastic flow Taking the outer hollow member, and a configuration in which assimilate the nut Te.

  In the invention according to claim 6, the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the outer hollow member An auxiliary member having a length sufficient to be inserted into both of the holes, and a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member. The outer surface on the opposite side is in contact with the inner surface of the outer hollow member, and the inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxial, and the auxiliary member is fitted to each hole and nut. The material derived from one end portion of the auxiliary member is assimilated to the outer hollow member by frictional heat and plastic flow, and the inner hollow member adjacent thereto is shaped to sandwich the thickness direction, and the other end of the auxiliary member Due to part The material, causes assimilated into the outer hollow member by frictional heat and plastic flow, a configuration that is filled in the thread groove of the nut.

  In the invention according to claim 7, the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the outer hollow member An auxiliary member long enough to be inserted into both of the holes, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an outer surface of the outer hollow member A second nut provided so as to correspond to one of the auxiliary member insertion holes, and an outer hollow member whose outer surface on the side opposite to the first nut is on the second nut side The inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxially positioned, and the auxiliary member is inserted into each hole and each nut. The material derived from the part is used for frictional heat and plastic flow. The outer hollow member is shaped so as to be sandwiched in the thickness direction, and the screw groove of the first nut is filled with the screw groove of the first nut, and the material derived from the other end portion of the auxiliary member is screwed into the second nut by frictional heat and plastic flow The structure filled in the groove is adopted.

  In the invention described in claim 8, the outer hollow member formed so as to face the auxiliary member insertion hole, the inner hollow member formed so as to face the auxiliary member insertion hole, and the outer hollow member An auxiliary member long enough to be inserted into both of the holes, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an outer surface of the outer hollow member A second nut provided so as to correspond to one of the auxiliary member insertion holes, and an outer hollow member whose outer surface on the side opposite to the first nut is on the second nut side The inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxially positioned, and the auxiliary member is inserted into each hole and each nut. The material derived from the part is used for frictional heat and plastic flow. The outer hollow member and the first nut adjacent thereto are assimilated, and the material derived from the other end portion of the auxiliary member is separated from the second nut, the outer hollow member, and the adjacent member by frictional heat and plastic flow. The structure is assimilated to the inner hollow member.

  In the invention according to claim 9, an outer hollow member formed so as to face the auxiliary member insertion hole, an inner hollow member formed so as to face the auxiliary member insertion hole, and the outer hollow member An auxiliary member long enough to be inserted into both of the holes, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an outer surface of the outer hollow member A second nut provided so as to correspond to one of the auxiliary member insertion holes, and an outer hollow member whose outer surface on the side opposite to the first nut is on the second nut side The inner hollow member is fitted to the outer hollow member so that each hole for inserting the auxiliary member is coaxially positioned, and the auxiliary member is inserted into each hole and each nut. The material derived from the part is used for frictional heat and plastic flow. And assimilating to the outer hollow member, filling the screw groove of the first nut adjacent to the second hollow member, the material derived from the other end portion of the auxiliary member, the second nut by frictional heat and plastic flow, and The structure assimilated to the outer hollow member adjacent to the outer hollow member is adopted.

  In the invention described in claim 10, the thread groove is provided in the hole for inserting the auxiliary member.

  According to the member joining structure of the present invention, the following excellent effects can be obtained.

  (1) In the invention described in claim 1, one end portion of the auxiliary member is formed so as to sandwich the inner hollow member and the outer hollow member adjacent thereto in the thickness direction, and the other end portion of the same auxiliary member is Since the hollow member is formed so as to be sandwiched in the thickness direction, a joint in which hollow members having different cross-sectional shapes are fitted can be efficiently joined.

  (2) In the invention according to claim 2, one end portion of the auxiliary member is assimilated to the inner hollow member and the outer hollow member adjacent thereto, and the other end portion of the same auxiliary member is assimilated to the outer hollow member. As a result, joints fitted with hollow members having different cross-sectional shapes can be joined efficiently.

  (3) In the invention according to claim 3, the one end portion of the auxiliary member is assimilated to the outer hollow member, and the inner hollow member adjacent thereto is shaped so as to be sandwiched in the thickness direction, and the other end of the same auxiliary member is formed. Since the portion is assimilated to the outer hollow member, a joint in which hollow members having different cross-sectional shapes are fitted can be efficiently joined.

  (4) In the invention described in claim 4, one end portion of the auxiliary member is shaped so as to sandwich the inner hollow member and the outer hollow member adjacent thereto in the thickness direction, and the other end portion of the same auxiliary member is Since the outer hollow member is formed so as to be sandwiched in the thickness direction, and the thread groove of the nut is filled, a joint in which hollow members having different cross-sectional shapes are fitted can be efficiently joined.

  (5) In the invention according to claim 5, one end portion of the auxiliary member is assimilated into the inner hollow member and the outer hollow member adjacent thereto, and the other end portion of the same auxiliary member is replaced with the outer hollow member, and Since it is assimilated to the nut, it is possible to efficiently join joints in which hollow members having different cross-sectional shapes are fitted.

  (6) In the invention described in claim 6, the one end portion of the auxiliary member is assimilated to the outer hollow member, and the inner hollow member adjacent to the outer hollow member is shaped so as to be sandwiched in the thickness direction. Since the portion is assimilated to the outer hollow member and filled into the thread groove of the nut, a fitting in which hollow members having different cross-sectional shapes are fitted can be efficiently joined.

  (7) In the invention described in claim 7, one end portion of the auxiliary member is formed so as to sandwich the outer hollow member in the thickness direction, and the thread groove of the first nut is filled, and the other end portion of the auxiliary member is formed. Since the thread groove of the second nut is filled, it is possible to efficiently join joints fitted with hollow members having different cross-sectional shapes.

  (8) In the invention described in claim 8, one end portion of the auxiliary member is assimilated with the outer hollow member and the first nut adjacent thereto, and the other end portion of the auxiliary member is replaced with the second nut, Since the outer hollow member and the inner hollow member adjacent to the outer hollow member are assimilated, it is possible to efficiently join joints fitted with hollow members having different cross-sectional shapes.

  (9) In the invention described in claim 9, one end portion of the auxiliary member is assimilated into the outer hollow member, and the screw groove of the first nut adjacent thereto is filled, and the other end portion of the auxiliary member is filled. Since the second nut and the outer hollow member adjacent to the second nut are assimilated, it is possible to efficiently join the fittings in which the hollow members having different cross-sectional shapes are fitted.

  (10) In the invention according to the tenth aspect, the plastic flow portion derived from the auxiliary member enters the screw groove provided in the hole for inserting the auxiliary member, whereby each hollow member and the auxiliary member can be firmly joined.

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

  FIG. 1 shows a first example of a member joining structure according to the present invention, which corresponds to claim 1.

  This member joining structure includes an outer hollow member 11 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 11, and an auxiliary member 13 having a round bar shape.

  The auxiliary member 13 is made of an aluminum alloy, and the outer hollow member 11 and the inner hollow member 12 are made of steel that is harder and higher in softening temperature than the aluminum alloy.

  A screw hole 2a that penetrates in the member thickness direction is formed in the first portion 1a of the outer hollow member 11, and a second portion 1b that faces the first portion 1a penetrates in the member thickness direction. A threaded hole 2b is formed so as to face the threaded hole 2a.

  A screw hole 4a penetrating in the member thickness direction is formed in the first portion 3a of the inner hollow member 12, and a second portion 3b facing the first portion 3a is penetrated in the member thickness direction. A hole 4b is formed so as to face the screw hole 4a.

  The auxiliary member 13 has a length sufficient to be inserted into both the screw holes 2a and 2b of the outer hollow member 11, and is formed with a flange at one end portion.

  The inner hollow member 12 is fitted into the outer hollow member 11 such that the outer surface of the first portion 3a abuts the inner surface of the first portion 1a of the outer hollow member 11, and the screw hole 4a and the hole 4b are screw holes 2a. , 2b and the auxiliary member 13 is inserted into the screw holes 2a, 4a, the hole 4b, and the screw hole 2b (see the upper side of FIG. 1).

  The material derived from one end portion of the auxiliary member 13 sandwiches the inner hollow member 12 and the outer hollow member 11 adjacent thereto by frictional heat and plastic flow in the thickness direction, and enters the grooves of the screw holes 2a and 4a. The material derived from the other end portion of the same auxiliary member 13 is shaped so as to sandwich the outer hollow member 11 in the thickness direction by frictional heat and plastic flow (see the lower side in FIG. 1).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the screw holes 2a and 4a, and the screw holes 2a and 4a. Block.

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow site, the first portion 1a of the outer hollow member 11, the first portion 3a of the inner hollow member 12, and one end portion of the auxiliary member 13 are Are joined together.

  Moreover, when the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the entire screw hole 2b and closes the screw hole 2b. .

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the second portion 1b of the outer hollow member 11 and the other end portion of the auxiliary member 13 are joined to each other.

  FIG. 2 shows a second example of the member joining structure according to the present invention. Corresponding to claim 2, in the figure, the same reference numerals as those in FIG.

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 18 having a rectangular cross section fitted inside the outer hollow member 17, and an auxiliary member 13 having a round bar shape.

  The outer hollow member 17, the inner hollow member 18, and the auxiliary member 13 are all made of an aluminum alloy.

  A screw hole 6a that penetrates in the member thickness direction is formed in the first portion 5a of the outer hollow member 17, and a second portion 5b that faces the first portion 5a penetrates in the member thickness direction. A screw hole 6b is formed so as to face the screw hole 6a.

  A screw hole 8a that penetrates in the member thickness direction is formed in the first portion 7a of the inner hollow member 18, and a second portion 7b that faces the first portion 7a penetrates in the member thickness direction. A hole 8b is formed so as to face the screw hole 8a.

  The auxiliary member 13 has a length sufficient to be inserted into both the screw holes 6a and 6b of the outer hollow member 17, and is formed with a flange at one end portion.

  The inner hollow member 18 is fitted into the outer hollow member 17 so that the outer surface of the first portion 7a abuts the inner surface of the first portion 5a of the outer hollow member 17, and the screw holes 8a and 8b are screw holes 6a. 6b, the auxiliary member 13 is inserted into the screw holes 6a, 8a, the hole 8b, and the screw hole 6b (see the upper side of FIG. 2).

  The material derived from the one end portion of the auxiliary member 13 is mixed with the material derived from the inner hollow member 18 and the outer hollow member 17 adjacent thereto by frictional heat and plastic flow to form an assimilated layer 19, and the same auxiliary The material derived from the other end portion of the member 13 is mixed with the material derived from the outer hollow member 17 by frictional heat and plastic flow to form an assimilated layer 19 (see the lower side in FIG. 2).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow, the material derived from the outer hollow member 17 and the inner hollow member 18 are mixed together, and the screw hole 6a. , 8a are closed.

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow site, the first portion 5a of the outer hollow member 17, the second portion 7a of the inner hollow member 18, and one end portion of the auxiliary member 13 are They are joined together.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the outer hollow member 17 are mixed together to close the screw hole 6b.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the second portion 5b of the outer hollow member 17 and the other end portion of the auxiliary member 13 are joined to each other.

  FIG. 3 shows a third example of the member joining structure according to the present invention. Corresponding to claim 3, the same reference numerals in FIGS. 1 and 2 denote the same parts.

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 17, and an auxiliary member 13 having a round bar shape.

  Both the outer hollow member 17 and the auxiliary member 13 are made of an aluminum alloy, and the inner hollow member 12 is made of steel that is harder and higher in softening temperature than the aluminum alloy.

  A screw hole 6a that penetrates in the member thickness direction is formed in the first portion 5a of the outer hollow member 17, and a second portion 5b that faces the first portion 5a penetrates in the member thickness direction. A screw hole 6b is formed so as to face the screw hole 6a.

  A screw hole 4a penetrating in the member thickness direction is formed in the first portion 3a of the inner hollow member 12, and a second portion 3b facing the first portion 3a is penetrated in the member thickness direction. A hole 4b is formed so as to face the screw hole 4a.

  The auxiliary member 13 has a length sufficient to be inserted into both the screw holes 6a and 6b of the outer hollow member 17, and is formed with a flange at one end portion.

  The inner hollow member 12 is fitted into the outer hollow member 17 so that the outer surface of the first portion 3a abuts the inner surface of the first portion 5a of the outer hollow member 17, and the screw hole 4a and the hole 4b are screw holes 6a. , 6b and the auxiliary member 13 is inserted into the screw holes 6a, 4a, the hole 4b, and the screw hole 6b (see the upper side of FIG. 3).

  The material derived from the one end portion of the auxiliary member 13 is mixed with the material derived from the outer hollow member 17 by frictional heat and plastic flow to form the assimilated layer 19, and the inner hollow member 12 adjacent thereto is formed in the thickness direction. The material derived from the other end portion of the same auxiliary member 13 is mixed with the material derived from the outer hollow member 17 due to frictional heat and plastic flow, and is formed to be inserted into the groove of the screw hole 4a. 19 (see the lower side of FIG. 3).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the outer hollow member 17 are mixed together to close the screw holes 6a and 4a.

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow site, the first portion 5a of the outer hollow member 17, the second portion 3a of the inner hollow member 12, and one end portion of the auxiliary member 13 Are joined together.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the outer hollow member 17 are mixed together to close the screw hole 6b.

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow portion, the second portion 5b of the outer hollow member 17 and the other end portion of the auxiliary member 13 are joined to each other.

  FIG. 4 shows a fourth example of the member joining structure of the present invention. Corresponding to claim 4, in the figure, the same reference numerals as those in FIGS. 1 to 3 denote the same parts.

  The member joining structure includes an outer hollow member 11 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 11, a round bar-shaped auxiliary member 13, and a nut 20.

  The auxiliary member 13 is made of an aluminum alloy, and the outer hollow member 11, the inner hollow member 12, and the nut 20 are made of steel that is harder and higher in softening temperature than the aluminum alloy.

  A hole 2c that penetrates in the member thickness direction is formed in the first portion 1a of the outer hollow member 11, and the second portion 1b that faces the first portion 1a penetrates in the member thickness direction. A hole 2d is formed so as to face the hole 2c.

  A hole 4c that penetrates in the member thickness direction is formed in the first portion 3a of the inner hollow member 12, and a second portion 3b that faces the first portion 3a penetrates in the member thickness direction. A hole 4d is formed so as to face the screw hole 4c.

  The auxiliary member 13 has a length sufficient to be inserted into both the holes 2c and 2d of the outer hollow member 11, and is formed with a flange at one end portion.

  The nut 20 is fixed to the outer surface of the inner hollow member 12 so as to match the drilling position of the hole 4d.

  The inner hollow member 12 is fitted into the outer hollow member 11 so that the outer surface of the first portion 3a abuts the inner surface of the first portion 1a of the outer hollow member 11, and the holes 4c and 4d are connected to the holes 2c and 2d. Located on the same axis, the auxiliary member 13 is inserted into the holes 2c, 4c, 4d, the nut 20, and the hole 2d (see the upper side of FIG. 4).

  The material derived from one end portion of the auxiliary member 13 is shaped so as to sandwich the inner hollow member 12 and the outer hollow member 11 adjacent thereto by frictional heat and plastic flow in the thickness direction. The material derived from the part is shaped so as to sandwich the outer hollow member 11 in the thickness direction by frictional heat and plastic flow, and enter the groove of the nut 20 (see the lower side in FIG. 4).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the holes 2c and 4c, and closes the holes 2c and 4c. .

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow site, the first portion 1a of the outer hollow member 11, the first portion 3a of the inner hollow member 12, and one end portion of the auxiliary member 13 are They are joined together.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the entire hole 2d, and closes the hole 2d and the nut. Get into 20 grooves.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the second portion 1b of the outer hollow member 11 and the other end portion of the auxiliary member 13 are joined to each other.

  FIG. 5 shows a fifth example of the member joining structure according to the present invention. Corresponding to claim 5, parts denoted by the same reference numerals as in FIGS. 1 to 4 represent the same thing.

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 18 having a rectangular cross section fitted inside the outer hollow member 17, a round bar-shaped auxiliary member 13, and a nut 21.

  The outer hollow member 17, the inner hollow member 18, the auxiliary member 13, and the nut 21 are all made of an aluminum alloy.

  A hole 6c penetrating in the member thickness direction is formed in the first portion 5a of the outer hollow member 17, and the second portion 5b facing the first portion 5a penetrates in the member thickness direction. A hole 6d is formed so as to face the hole 6c.

  A hole 8c that penetrates in the member thickness direction is formed in the first portion 7a of the inner hollow member 18, and the second portion 7b that faces the first portion 7a penetrates in the member thickness direction. A hole 8d is formed so as to face the hole 8c.

  The auxiliary member 13 has a length sufficient to be inserted into both the screw holes 6c and 6d of the outer hollow member 17, and is formed with a flange at one end portion.

  The nut 21 is fixed to the outer surface of the inner hollow member 18 so as to match the drilling position of the hole 8d.

  The inner hollow member 18 is fitted into the outer hollow member 11 so that the outer surface of the first portion 7a abuts the inner surface of the first portion 5a of the outer hollow member 17, and the holes 8c and 8d are connected to the holes 6c and 6d. The auxiliary member 13 is coaxially positioned, and is inserted into the holes 6c, 8c, 8d, the nut 21, and the hole 6d (see the upper side in FIG. 5).

  The material derived from the one end portion of the auxiliary member 13 is mixed with the material derived from the inner hollow member 18 and the outer hollow member 17 adjacent thereto by frictional heat and plastic flow to form an assimilated layer 19, and the same auxiliary The material derived from the other end portion of the member 13 is mixed with the material derived from the outer hollow member 17 and the nut 21 by frictional heat and plastic flow to form an assimilation layer 19 (see the lower side in FIG. 5). .

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow, the material derived from the outer hollow member 17 and the inner hollow member 18 are mixed together, and the holes 6c, Block 8c.

  Thereafter, when the joining tool 16 is pulled away from the auxiliary member 13 to solidify the plastic flow site, the first portion 5a of the outer hollow member 17, the second portion 7a of the inner hollow member 18, and one end portion of the auxiliary member 13 are They are joined together.

  Further, when the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the materials derived from the auxiliary member 13, the outer hollow member 17, and the nut 21 softened by frictional heat and plastic flow are mixed together, and the hole 6 d is formed. Block it.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the second portion 5b of the outer hollow member 17, the nut 21, and the other end portion of the auxiliary member 13 are joined together.

  FIG. 6 shows a sixth example of the member joining structure according to the present invention. Corresponding to claim 6, in the figure, the same reference numerals as those in FIGS. 1 to 5 denote the same parts.

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 17, a round bar-shaped auxiliary member 13, and a nut 20.

  The outer hollow member 17 and the auxiliary member 13 are both made of an aluminum alloy, and the inner hollow member 12 and the nut 20 are both made of steel that is harder and higher in softening temperature than the aluminum alloy.

  A hole 6c penetrating in the member thickness direction is formed in the first portion 5a of the outer hollow member 17, and the second portion 5b facing the first portion 5a penetrates in the member thickness direction. A hole 6d is formed so as to face the hole 6c.

  A hole 4c that penetrates in the member thickness direction is formed in the first portion 3a of the inner hollow member 12, and a second portion 3b that faces the first portion 3a penetrates in the member thickness direction. The hole 4d is formed so as to face the hole 4c.

  The auxiliary member 13 has a length sufficient to be inserted into both the screw holes 6c and 6d of the outer hollow member 17, and is formed with a flange at one end portion.

  The nut 21 is fixed to the outer surface of the inner hollow member 12 so as to match the drilling position of the hole 4d.

  The inner hollow member 12 is fitted into the outer hollow member 17 so that the outer surface of the first portion 3a abuts the inner surface of the first portion 5a of the outer hollow member 17, and the holes 4c and 4d are connected to the holes 6c and 6d. Located on the same axis, the auxiliary member 13 is inserted into the holes 6c, 4c, 4d, the nut 20, and the hole 6d (see the upper side in FIG. 6).

  The material derived from the one end portion of the auxiliary member 13 is mixed with the material derived from the outer hollow member 17 by frictional heat and plastic flow to form the assimilated layer 19, and the inner hollow member 12 adjacent thereto is formed in the thickness direction. The material derived from the other end portion of the same auxiliary member 13 is mixed with the material derived from the outer hollow member 17 by frictional heat and plastic flow to form an anabolic layer 19. It is shaped to enter the groove (see the lower side of FIG. 6).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the inner hollow member 18 are mixed together to close the holes 6c and 4c.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the first portion 5a of the outer hollow member 17, the second portion 3a of the inner hollow member 12, and one end portion of the auxiliary member 13 are They are joined together.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the outer hollow member 17 are mixed to close the hole 6d and the nut. Get into 20 grooves.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the second portion 5b of the outer hollow member 17, the nut 20, and the other end portion of the auxiliary member 13 are joined to each other.

  FIGS. 7 and 8 show a seventh example of the member joining structure of the present invention. Corresponding to claim 7, the parts denoted by the same reference numerals as in FIGS. 1 to 6 represent the same thing. .

  This member joining structure includes an outer hollow member 11 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 11, a round bar-shaped auxiliary member 13, and nuts 22 and 23. Yes.

  The auxiliary member 13 is made of an aluminum alloy, and the outer hollow member 11, the inner hollow member 12, and the nuts 22 and 23 are made of steel that is harder and higher in softening temperature than the aluminum alloy.

  The third portion 1c of the outer hollow member 11 between the first and second portions 1a and 1b is formed with a hole 2e penetrating in the thickness direction of the member, and faces the third portion 1c. A hole 2f penetrating in the thickness direction of the member is formed in the fourth portion 1d so as to face the hole 2e.

  The third portion 3c of the inner hollow member 12 between the first and second portions 3a and 3b is provided with a hole 4e penetrating in the member thickness direction, and faces the third portion 3c. In the fourth portion 3d, a hole 4f penetrating in the member thickness direction is formed so as to face the screw hole 4e.

  The auxiliary member 13 has a length sufficient to be inserted into both the holes 2e and 2f of the outer hollow member 11 and a length corresponding to the thickness of the nut 23, and a flange is formed at one end portion. .

  The nut 22 is fixed to the outer surface of the inner hollow member 12 so as to match the drilling position of the hole 4e.

  The nut 23 is fixed to the outer surface of the outer hollow member 11 so as to match the drilling position of the hole 2f.

  The inner hollow member 12 is fitted into the outer hollow member 11 so that the outer surface of the fourth portion 3d abuts the inner surface of the fourth portion 1d of the outer hollow member 11, and the holes 4e and 4f are connected to the holes 2e and 2f. The auxiliary member 13 is coaxially positioned, and is inserted into the hole 2e, the nut 22, the holes 4e and 4f, the hole 2f, and the nut 23 (see FIG. 8).

  The material derived from one end portion of the auxiliary member 13 enters the groove of the nut 22 by frictional heat and plastic flow, and is shaped so as to sandwich the outer hollow member 11 adjacent thereto in the thickness direction. The material derived from the end portion is shaped to enter the groove of the nut 23 (see FIG. 7).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the holes 2e and 4e, and closes the holes 2e and 4e. At the same time, it enters the groove of the nut 22.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the third portion 1c of the outer hollow member 11, the third portion 3c of the inner hollow member 12, the nut 22, and the auxiliary member 13 One end portions are joined to each other.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow is packed over the holes 2f and 4f, and the holes 2f and 4f. And enters the groove of the nut 23.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the fourth portion 1d of the outer hollow member 11, the fourth portion 3d of the inner hollow member 12, the nut 23, and the auxiliary member 13 The other end portions are joined to each other.

  FIGS. 9 and 10 show an eighth example of the member joining structure of the present invention, corresponding to claim 8, in which the same reference numerals in FIGS. 1 to 8 denote the same parts. .

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 18 having a rectangular cross section fitted inside the outer hollow member 17, a round bar-shaped auxiliary member 13, and nuts 24 and 25. Yes.

  The outer hollow member 17, the inner hollow member 18, the auxiliary member 13, and the nuts 24 and 25 are all made of an aluminum alloy.

  The third portion 5c of the outer hollow member 17 between the first and second portions 5a and 5b is formed with a hole 6e penetrating in the thickness direction of the member, and faces the third portion 5c. In the fourth portion 5d, a hole 6f penetrating in the thickness direction of the member is formed so as to face the hole 6e.

  A hole 8e that penetrates in the thickness direction of the member is formed in the third portion 7c of the inner hollow member 18 between the first and second portions 7a and 7b, and faces the third portion 7c. In the fourth portion 7d, a hole 8f penetrating in the member thickness direction is formed so as to face the hole 8e.

  The auxiliary member 13 has a length sufficient to be inserted into both the holes 6e and 6f of the outer hollow member 17 and a length corresponding to the thickness of the nut 25, and has a flange formed at one end portion. .

  The nut 24 is fixed to the outer surface of the inner hollow member 18 so as to match the drilling position of the hole 8e.

  The nut 25 is fixed to the outer surface of the outer hollow member 17 so as to match the drilling position of the hole 8f.

  The inner hollow member 18 is fitted into the outer hollow member 11 so that the outer surface of the fourth portion 7d abuts the inner surface of the fourth portion 5d of the outer hollow member 17, and the holes 8e and 8f are respectively connected to the holes 6e and 6f. The auxiliary member 13 is coaxially positioned, and is inserted into the hole 6e, the nut 24, the holes 8e and 8f, the hole 6f, and the nut 25 (see FIG. 10).

  The material derived from one end portion of the auxiliary member 13 is mixed with the material derived from the nut 24 and the outer hollow member 17 by frictional heat and plastic flow to form an anabolic layer 19, and is formed on the other end portion of the same auxiliary member 13. The derived material is mixed with the material derived from the nut 25, the outer hollow member 17, and the inner hollow member 18 by frictional heat and plastic flow to form the assimilation layer 19 (see FIG. 9).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the nut 24 are mixed together to close the hole 6e.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the third portion 5c of the outer hollow member 17, the third portion 7c of the inner hollow member 18, the nut 24, and the auxiliary member 13 One end portions are joined to each other.

  Further, when the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the materials derived from the auxiliary member 13, the outer hollow member 17, the inner hollow member 18 and the nut 25 softened by frictional heat and plastic flow are mixed together. The holes 6f and 8f are closed.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the fourth portion 5d of the outer hollow member 17, the fourth portion 7d of the inner hollow member 18, the nut 25, and the auxiliary member 13 are obtained. The other end portions of the two are joined together.

  FIGS. 11 and 12 show a ninth example of the member joining structure of the present invention, corresponding to claim 9, in which the same reference numerals in FIGS. 1 to 10 denote the same parts. .

  This member joining structure includes an outer hollow member 17 having a rectangular cross section, an inner hollow member 12 having a rectangular cross section fitted inside the outer hollow member 17, a round bar-shaped auxiliary member 13, and nuts 22 and 25. Yes.

  The outer hollow member 17, the auxiliary member 13, and the nut 25 are all made of an aluminum alloy, and the inner hollow member 12 and the nut 22 are made of steel that is harder and higher in softening temperature than the aluminum alloy.

  The third portion 5c of the outer hollow member 17 between the first and second portions 5a and 5b is formed with a hole 6e penetrating in the thickness direction of the member, and faces the third portion 5c. In the fourth portion 5d, a hole 6f penetrating in the thickness direction of the member is formed so as to face the hole 6e.

  The third portion 3c of the inner hollow member 12 between the first and second portions 3a and 3b is provided with a hole 4e penetrating in the member thickness direction, and faces the third portion 3c. A hole 4f penetrating in the thickness direction of the member is formed in the fourth portion 3d so as to face the hole 4e.

  The auxiliary member 13 has a length sufficient to be inserted into both the holes 6e and 6f of the outer hollow member 17 and a length corresponding to the thickness of the nut 25, and has a flange formed at one end portion. .

  The nut 22 is fixed to the outer surface of the inner hollow member 12 so as to match the drilling position of the hole 4e.

  The nut 25 is fixed to the outer surface of the outer hollow member 17 so as to match the drilling position of the hole 6f.

  The inner hollow member 12 is fitted into the outer hollow member 11 so that the outer surface of the fourth portion 3d abuts the inner surface of the fourth portion 5d of the outer hollow member 17, and the holes 4e and 4f are formed as holes 6e and 6f. Located on the same axis, the auxiliary member 13 is inserted into the hole 6e, the nut 22, the holes 4e and 4f, the hole 6f, and the nut 25 (see FIG. 12).

  The material derived from the one end portion of the auxiliary member 13 is mixed with the material derived from the outer hollow member 17 by frictional heat and plastic flow to form an anabolic layer 19 and shaped to enter the groove of the nut 22. The material derived from the other end portion of the auxiliary member 13 is mixed with the material derived from the nut 25 and the outer hollow member 17 by frictional heat and plastic flow to form the assimilation layer 19 (see FIG. 11).

  When the auxiliary member 13 is shaped as described above, a steel joining tool 16 in which a pin portion 14 having a smaller outer diameter than the auxiliary member 13 is coaxially connected to a cylindrical shoulder portion 15 is formed. Is used.

  When the welding tool 16 is pressed against one end surface of the auxiliary member 13 while rotating, the auxiliary member 13 softened by frictional heat and plastic flow and the material derived from the outer hollow member 17 are mixed together to block the hole 6e and Get into the groove.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the third portion 5c of the outer hollow member 17, the third portion 3c of the inner hollow member 12, the nut 22, and the auxiliary member 13 One end portions are joined to each other.

  When the welding tool 16 is pressed against the other end surface of the auxiliary member 13 while rotating, the material derived from the auxiliary member 13 softened by frictional heat and plastic flow, and the material derived from the outer hollow member 17 and the nut 25 are mixed together. The holes 4f are packed all over to close the holes 2f and 4f.

  Thereafter, when the joining tool 16 is separated from the auxiliary member 13 to solidify the plastic flow site, the fourth portion 5d of the outer hollow member 17, the fourth portion 3d of the inner hollow member 12, the nut 25, and the auxiliary member 13 The other end portions are joined to each other.

  In addition, the member joining structure of this invention is not limited only to embodiment mentioned above, Of course, it can add in the range which does not deviate from the summary of this invention.

  The member joining structure of the present invention can be applied to joining and assembling processes for various parts.

It is a conceptual diagram which shows the 1st example of the member junction structure of this invention. It is a conceptual diagram which shows the 2nd example of the member junction structure of this invention. It is a conceptual diagram which shows the 3rd example of the member junction structure of this invention. It is a conceptual diagram which shows the 4th example of the member junction structure of this invention. It is a conceptual diagram which shows the 5th example of the member junction structure of this invention. It is a conceptual diagram which shows the 6th example of the member junction structure of this invention. It is a conceptual diagram which shows the 7th example (after construction) of the member junction structure of this invention. It is a conceptual diagram which shows the 7th example (before construction) of the member junction structure of this invention. It is a conceptual diagram which shows the 8th example (after construction) of the member junction structure of this invention. It is a conceptual diagram which shows the 8th example (before construction) of the member joining structure of this invention. It is a conceptual diagram which shows the 9th example (after construction) of the member junction structure of this invention. It is a conceptual diagram which shows the 9th example (before construction) of the member junction structure of this invention.

Explanation of symbols

2a, 6a Screw hole 2b, 6b Screw hole 2c, 6c Hole 2d, 6d Hole 2e, 6e Hole 2f, 6f Hole 4a, 8a Screw hole 4b, 8b Hole 4c, 8c Hole 4d, 8d Hole 4e, 8e Hole 4f, 8f Hole 11 Outer hollow member 12 Inner hollow member 13 Auxiliary member 17 Outer hollow member 18 Inner hollow member 19 Assimilation layer 20-25 Nut

Claims (10)

  It is inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. An auxiliary member having a sufficient length, the outer surface of the inner hollow member is in contact with the inner surface of the outer hollow member, and the inner hollow member is formed as an outer hollow member so that the holes for inserting the auxiliary member are positioned coaxially. After fitting, the auxiliary member is inserted into each hole so that the material derived from one end portion of the auxiliary member is sandwiched in the thickness direction between the inner hollow member and the outer hollow member adjacent thereto by frictional heat and plastic flow. A member joining structure characterized in that the material derived from the other end portion of the auxiliary member is shaped so as to sandwich the outer hollow member in the thickness direction by frictional heat and plastic flow.   It is inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. An auxiliary member having a sufficient length, the outer surface of the inner hollow member is in contact with the inner surface of the outer hollow member, and the inner hollow member is formed as an outer hollow member so that the holes for inserting the auxiliary member are positioned coaxially. After fitting, the auxiliary member is inserted into each hole, and the material derived from one end portion of the auxiliary member is assimilated into the inner hollow member and the outer hollow member adjacent thereto by frictional heat and plastic flow, and the auxiliary member A member joining structure characterized by assimilating a material derived from the other end portion of the outer hollow member by frictional heat and plastic flow.   It is inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. An auxiliary member having a sufficient length, the outer surface of the inner hollow member is in contact with the inner surface of the outer hollow member, and the inner hollow member is formed as an outer hollow member so that the holes for inserting the auxiliary member are positioned coaxially. After fitting together, the auxiliary member is inserted into each hole, and the material derived from one end portion of the auxiliary member is assimilated to the outer hollow member by frictional heat and plastic flow, and the inner hollow member adjacent to the material is in the thickness direction. A member joining structure characterized in that a material derived from the other end portion of the auxiliary member is assimilated into an outer hollow member by frictional heat and plastic flow.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. And a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and the outer surface opposite to the nut of the inner hollow member is the outer hollow member. The inner hollow member is fitted to the outer hollow member so that the holes are in contact with the inner surface and the auxiliary member insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and nut, and is inserted into one end portion of the auxiliary member. The derived material is shaped so that the inner hollow member and the adjacent outer hollow member are sandwiched in the thickness direction by frictional heat and plastic flow, and the material derived from the other end portion of the auxiliary member is frictional heat and plastic flow. By outside Together form the air-member so as to sandwich the thickness direction, joining members characterized by being filled in the screw groove of the nut structure.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. And a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and the outer surface opposite to the nut of the inner hollow member is the outer hollow member. The inner hollow member is fitted to the outer hollow member so that the holes are in contact with the inner surface and the auxiliary member insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and nut, and is inserted into one end portion of the auxiliary member. The material derived is assimilated to the inner hollow member and the outer hollow member adjacent thereto by frictional heat and plastic flow, and the material derived from the other end portion of the auxiliary member is outer hollow member by frictional heat and plastic flow, And Nut Structure for joining members, characterized in that is assimilated.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. And a nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and the outer surface opposite to the nut of the inner hollow member is the outer hollow member. The inner hollow member is fitted to the outer hollow member so that the holes are in contact with the inner surface and the auxiliary member insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and nut, and is inserted into one end portion of the auxiliary member. The material derived is assimilated to the outer hollow member by frictional heat and plastic flow, and the inner hollow member adjacent to the outer hollow member is shaped so as to be sandwiched in the thickness direction, and the material derived from the other end portion of the auxiliary member is And plasticity Structure for joining members, characterized causes assimilated into the outer hollow member by movement, that was filled in the screw grooves of the nut.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. A length of auxiliary member, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an auxiliary member insertion hole on the outer surface of the outer hollow member, A second nut provided so as to correspond thereto, the outer surface of the inner hollow member on the side opposite to the first nut abutting the inner surface of the outer hollow member on the second nut side, and an auxiliary member The inner hollow member is fitted to the outer hollow member so that the respective insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and each nut, and the material derived from one end portion of the auxiliary member is subjected to frictional heat. And thickness of outer hollow member by plastic flow And the first nut screw groove is filled, and the material derived from the other end portion of the auxiliary member is filled into the second nut screw groove by frictional heat and plastic flow. Member joining structure.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. A length of auxiliary member, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an auxiliary member insertion hole on the outer surface of the outer hollow member, A second nut provided so as to correspond thereto, the outer surface of the inner hollow member on the side opposite to the first nut abutting the inner surface of the outer hollow member on the second nut side, and an auxiliary member The inner hollow member is fitted to the outer hollow member so that the respective insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and each nut, and the material derived from one end portion of the auxiliary member is subjected to frictional heat. And the outer hollow member by plastic flow To the second nut, the outer hollow member, and the inner hollow member adjacent thereto by frictional heat and plastic flow. A member joining structure characterized by being assimilated.   Enough to be inserted into both the outer hollow member formed so as to face the hole for inserting the auxiliary member, the inner hollow member formed so as to face the hole for inserting the auxiliary member, and the hole of the outer hollow member. A length of auxiliary member, a first nut provided on the outer surface of the inner hollow member so as to correspond to the hole for inserting one auxiliary member, and an auxiliary member insertion hole on the outer surface of the outer hollow member, A second nut provided so as to correspond thereto, the outer surface of the inner hollow member on the side opposite to the first nut abutting the inner surface of the outer hollow member on the second nut side, and an auxiliary member The inner hollow member is fitted to the outer hollow member so that the respective insertion holes are positioned coaxially, and the auxiliary member is inserted into each hole and each nut, and the material derived from one end portion of the auxiliary member is subjected to frictional heat. And assimilated into the outer hollow member by plastic flow And filling the screw groove of the first nut adjacent to the second nut, the material derived from the other end portion of the auxiliary member into the second nut and the outer hollow adjacent to it by frictional heat and plastic flow. A member joint structure characterized by being assimilated to a member.   The member joining structure according to any one of claims 1 to 9, wherein a thread groove is provided in an auxiliary member insertion hole.

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