Flare fitting structure and flared tube manufacturing method
AssigneeUsui Co., Ltd.
InventorIichiro SEINO
Life of this patent
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Abstract
In a flare fitting structure in which a flared portion that is formed in an end of a flared tube and faces a connected member is pressed by a flared nut to connect the flared tube to the connected member, the flared tube is formed by flaring a cylindrical tube including an original tube and a coating layer that coats a surface of the original tube, the flared portion includes a flare inclined plane that faces the connected member, and the flare inclined plane is formed with a machining portion in which the original tube is exposed by a machining operation.
Claims5
A flare fitting structure in which a flared portion formed in an end of a flared tube faces a connected member and the flared portion is pressed by a flared nut to connect the flared tube to the connected member, wherein
- the flared tube is formed by flaring a cylindrical tube including an original tube and a coating layer that coats a surface of the original tube,
- the flared portion includes a flare inclined plane that faces the connected member, and
- the flare inclined plane is formed with a machining portion in which the original tube is exposed by a machining operation.
A method of manufacturing a flared tube, comprising:
- a machining operation step of forming a machining portion having an outer diameter smaller than that of an original tube in a tube end portion of a cylindrical tube by cutting a predetermined area of an outer circumferential surface of the cylindrical tube including the original tube and a coating layer that coats a surface of the original tube in an axial direction from an end edge, and
- a flaring step of forming a flare inclined plane of a flared portion that faces a connected member with the machining portion by forming the flared portion in the tube end portion by pressing the machining portion.
Dependencies are inferred from the claim text.