Resin tube connection device

A resin tube connection device connectable to a member which is to be connected and on which a contact surface having a flow-path hole is formed, comprising:

• a resin tube having a metal pipe, having a resin layer formed on an inner peripheral surface of the metal pipe and having a first flow path surrounded by the resin layer;
• a resin expanding portion that is formed of a same material as that of the resin tube and is integrally formed with the resin tube, and is provided so as to project in an axial direction from an end of the resin layer and project farther outwardly than the metal pipe in a radial direction of the resin tube;
• and
• a metal sleeve formed so as to cover an outer peripheral surface of the metal pipe and an outer surface of the resin expanding portion, wherein
• the resin expanding portion has a sealing surface being able to come into contact with the contact surface and has a second flow path communication with the first flow path of the resin tube and opening in the sealing surface,
• the sealing surface projects farther than an end surface of the metal sleeve in the axial direction, and
• a maximum length of a contact region where the resin expanding portion and the metal sleeve are in contact with each other in the axial direction in the outer surface is larger than a thickness of the resin layer in the radial direction,
• the end surface of the metal sleeve is located between the sealing surface and an end surface of the metal pipe in the axial direction, and the outer surface of the resin expanding portion extends to the end surface of the metal pipe in the axial direction, and
• the maximum length of the contact region where the resin expanding portion and the metal sleeve are in contact with each other in the outer surface is equivalent to a distance between the end surface of the metal sleeve and the end surface of the metal pipe in the axial direction.

A resin tube connection device connectable to a member which is to be connected and on which a contact surface having a flow-path hole is formed, comprising:

• a resin tube having a metal pipe, having a resin layer formed on an inner peripheral surface of the metal pipe and having a first flow path surrounded by the resin layer;
• a resin expanding portion that is formed of a same material as that of the resin tube and is integrally formed with the resin tube, and is provided so as to project in an axial direction from an end of the resin layer and project farther outwardly than the metal pipe in a radial direction of the resin tube;
• and
• a metal sleeve formed so as to cover an outer peripheral surface of the metal pipe and an outer surface of the resin expanding portion, wherein
• the resin expanding portion has a sealing surface being able to come into contact with the contact surface and has a second flow path communication with the first flow path of the resin tube and opening in the sealing surface,
• the sealing surface projects farther than an end surface of the metal sleeve in the axial direction, and
• a maximum length of a contact region where the resin expanding portion and the metal sleeve are in contact with each other in the axial direction in the outer surface is larger than a thickness of the resin layer in the radial direction,
• an end surface of the metal sleeve is formed to be flush with an end surface of the metal pipe,
• the end surface of the metal sleeve has a recess,
• the resin expanding portion includes
• an end-surface covering portion formed on the end surface of the metal pipe and an end surface of the metal sleeve so as to project farther outwardly than the metal pipe in the radial direction, and
• a fitting portion that is formed integrally with the end-surface covering portion, has the outer surface and is fitted into the recess.

A resin tube connection device connectable to a member which is to be connected and on which a contact surface having a flow-path hole is formed, comprising:

• a resin tube having a metal pipe, having a resin layer that is formed on an inner peripheral surface of the metal pipe and projects in an axial direction from an end surface of the metal pipe and having a flow path surrounded by the resin layer;
• a resin sealer that is joined to the resin layer so as to cover an outer peripheral surface of a portion of the resin layer projecting from the metal pipe;
• and
• a metal sleeve formed so as to cover an outer peripheral surface of the metal pipe and an outer surface of the resin sealer, wherein
• the resin sealer has a sealing surface being able to come into contact with the contact surface and has an opening communicating with the flow path of the resin tube,
• the sealing surface projects farther than an end surface of the metal sleeve in the axial direction, and
• the resin tube connection device is configured such that a maximum length of a contact region where the resin sealer and the metal sleeve come into contact with each other in the axial direction is larger than a thickness of the resin layer in a radial direction, so as to prevent the resin tube or the resin expanding portion from being damaged when a torsional torque is applied.

A resin tube connection device connectable to a member which is to be connected and on which a contact surface having a flow-path hole is formed, comprising:

• a resin tube having a metal pipe, having a resin layer formed on an inner peripheral surface of the metal pipe and having a first flow path surrounded by the resin layer;
• a resin expanding portion that is formed of a same material as that of the resin tube and is integrally formed with the resin tube, and is provided so as to project in an axial direction from an end of the resin layer and project farther outwardly than the metal pipe in a radial direction of the resin tube;
• and
• a metal sleeve formed so as to cover an outer peripheral surface of the metal pipe and an outer surface of the resin expanding portion, wherein
• the resin expanding portion has a sealing surface being able to come into contact with the contact surface and has a second flow path communication with the first flow path of the resin tube and opening in the sealing surface,
• the sealing surface projects farther than an end surface of the metal sleeve in the axial direction, and
• a maximum length of a contact region where the resin expanding portion and the metal sleeve are in contact with each other in the axial direction in the outer surface is larger than a thickness of the resin layer in the radial direction,
• the metal sleeve has a recess, and
• the contact region is a distance from an end surface of the metal sleeve to a bottom surface of the recess.