Sealing member and pipe joint

A sealing member for sealing and connecting flow passage holes formed in two fluid devices, respectively, the sealing member comprising:

• a cylindrical body portion having a communication hole for providing communication between the flow passage holes;
• an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of one of the fluid devices;
• and
• an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in said one of the fluid devices, wherein
• the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
• the primary sealing portion has a chamfered portion formed at a corner portion formed by an inner circumferential surface and the flat surface of the primary sealing portion.

A sealing member for sealing and connecting flow passage holes formed in two fluid devices, respectively, the sealing member comprising:

• a cylindrical body portion having a communication hole for providing communication between the flow passage holes;
• an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of one of the fluid devices;
• and
• an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in said one of the fluid devices, wherein
• the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
• a thickness dimension in Mal a radial direction at the axially outer end of the primary sealing portion is not less than 10% and not greater than 30% of a thickness dimension in the radial direction at the axially inner end of the primary sealing portion.

A pipe joint comprising:

• a joint body having an external thread portion formed on an outer circumference thereof, and having a flow passage hole formed inside the joint body;
• a union nut having an internal thread portion formed on an inner circumference thereof and tightened to the external thread portion;
• and
• an inner ring connected at an axially outer end portion thereof to the joint body and having a bulge portion which is formed on an outer circumference of an axial inner end portion thereof so as to project and is to be press-fitted into an end portion of a tube, wherein
• the inner ring includes
• a cylindrical body portion having a communication hole for providing communication between flow passage holes formed in the joint body and the tube, respectively,
• an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of the joint body, and
• an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in the joint body,
• the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
• an inner circumferential surface of the primary sealing portion is inclined with respect to an inner circumferential surface of the body portion such that a diameter thereof gradually increases from an axially inner end thereof toward an axially outer end thereof.

A pipe joint comprising:

• a joint body having an external thread portion formed on an outer circumference thereof, and having a flow passage hole formed inside the joint body;
• a union nut having an internal thread portion formed on an inner circumference thereof and tightened to the external thread portion;
• and
• an inner ring connected at an axially outer end portion thereof to the joint body and having a bulge portion which is formed on an outer circumference of an axial inner end portion thereof so as to project and is to be press-fitted into an end portion of a tube, wherein
• the inner ring includes
• a cylindrical body portion having a communication hole for providing communication between flow passage holes formed in the joint body and the tube, respectively,
• an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of the joint body, and
• an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in the joint body,
• the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
• the primary sealing portion has a chamfered portion formed at a corner portion formed by an inner circumferential surface and the flat surface of the primary sealing portion.

A pipe joint comprising:

• a joint body having an external thread portion formed on an outer circumference thereof, and having a flow passage hole formed inside the joint body;
• a union nut having an internal thread portion formed on an inner circumference thereof and tightened to the external thread portion;
• and
• an inner ring connected at an axially outer end portion thereof to the joint body and having a bulge portion which is formed on an outer circumference of an axial inner end portion thereof so as to project and is to be press-fitted into an end portion of a tube, wherein
• the inner ring includes
• a cylindrical body portion having a communication hole for providing communication between flow passage holes formed in the joint body and the tube, respectively,
• an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of the joint body, and
• an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in the joint body,
• the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
• a thickness dimension in a radial direction at the axially outer end of the primary sealing portion is not less than 10% and not greater than 30% of a thickness dimension in the radial direction at the axially inner end of the primary sealing portion.