Joined body and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-11433450-B2
Application number	US-201816955711-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Jan 11, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A joined body includes: a first member having a pipe shape; and a second member including a wall portion having a plate shape, and a flange portion having a cylinder shape provided with an insertion hole through which the first member is inserted. In a state where the first member is inserted into the insertion hole of the flange portion of the second member, the first member and the second member are joined with the first member pipe-expanded. A material of the second member is larger than a material of the first member in a spring-back amount.

First claim

The invention claimed is:

1. A joined body comprising:
a first member having a pipe shape; and
a second member including a wall portion having a plate shape, and a flange portion having a cylinder shape and provided with an insertion hole through which the first member is inserted,
wherein in a joined state where the first member is inserted into the insertion hole of the flange portion of the second member, the first member and the second member are joined with the first member pipe-expanded,
wherein a material of the second member has a larger spring-back amount than a material of the first member, and
wherein an inner circumferential surface of the flange portion includes:
a base portion connected to the wall portion;
an abutting portion abutting on an outer circumferential surface of the first member in the joined state;
an intermediate portion extending in an axial direction between and joining the base portion and the abutting portion; and
a tip portion connected to the abutting portion and separated from the outer circumferential surface of the first member, the tip portion being inclined away from the abutting portion in the axial direction such that the inner circumferential surface of the flange portion expands at the tip portion, the tip portion forming a non-orthogonal inclination angle with respect to the axial direction;

wherein the base portion of the flange portion abuts on the outer circumferential surface of the first member in the joined state; and
wherein the tip portion is inclined away from the abutting portion and separated from the outer circumferential surface of the first member ata corner portion where the intermediate portion is joined to the abutting portion, the inner circumferential surface of the flange portion abuts on the outer circumferential surface of the first member at the corner portion in the joined state, and the inner circumferential surface of the flange portion does not abut on the outer circumferential surface of the first member at the tip portion in the joined state.

2. The joined body according to claim 1 , wherein a dimension in the axial direction of the abutting portion is larger than a dimension in a thickness direction of the wall portion.

3. The joined body according to claim 1 ,
wherein the wall portion includes a first surface from which the flange portion protrudes, and a second surface facing the first surface,
wherein the inner circumferential surface of the flange portion includes a curved surface portion where the inner circumferential surface of the flange portion is connected at least to the second surface of the wall portion and expands toward the second surface, and
wherein the curved surface portion of the flange portion abuts on the outer circumferential surface of the first member in the joined state.

4. The joined body according to claim 3 , wherein:
the abutting portion of the inner circumferential surface of the flange portion abuts on the outer circumferential surface of the first member on a tip side of the flange portion; and
the intermediate portion includes a separation portion separated from the outer circumferential surface of the first member between the curved surface portion and the abutting portion.

5. The joined body according to claim 3 , wherein the curved surface portion spreads to a tip side of the flange portion.

6. The joined body according to claim 1 , wherein tensile strength of a material of the first member is smaller than tensile strength of a material of the second member.

7. The joined body according to claim 1 , wherein Young's modulus of a material of the first member is larger than Young's modulus of a material of the second member.

8. A method for manufacturing a joined body according to claim 1 , comprising:
preparing the first member having a pipe shape, and the second member including the wall portion having a plate shape, and the flange portion having a cylinder shape and provided with the insertion hole through which the first member is inserted, the second member made of a material having a larger spring-back amount than a material of the first member;
inserting the first member into the insertion hole of the flange portion of the second member; and
pipe-expanding the first member in a radial direction toward the second member to join the first member and the second member by press-fitting.

Assignees

• Kobe Steel Ltd

Inventors

• Maeda Yasuhiro
• Watanabe Kenichi
• Kimura Takayuki
• Hashimura Toru

Classifications

• B21D39/044 Primary

  perpendicular · CPC title

• F16B9/07

  involving plastic or elastic deformation when assembling (involving plastic deformation with a part of or on one member entering a hole in the other F16B17/006) · CPC title

• F16B5/10

  by means of bayonet connections ({F16B5/0092 takes precedence}; fastening devices locking by rotation F16B21/02) · CPC title

• B21D39/06 Primary

  of tubes in openings, e.g. rolling-in · CPC title

• B21D39/206

  by axially compressing the elastic material · CPC title