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Expandable tubing (20) has a tubing wall (22) comprising a plurality of deformable tubular structures (24). The structures (24) have permeable walls and containing a filter medium (28) such that fluid may flow through the structures (24) and the filter medium (28) and thus through the tubing wall (2

Expandable tubing (20) has a tubing wall (22) comprising a plurality of deformable tubular structures (24). The structures (24) have permeable walls and containing a filter medium (28) such that fluid may flow through the structures (24) and the filter medium (28) and thus through the tubing wall (22).

대표청구항 ▼

Expandable tubing (20) has a tubing wall (22) comprising a plurality of deformable tubular structures (24). The structures (24) have permeable walls and containing a filter medium (28) such that fluid may flow through the structures (24) and the filter medium (28) and thus through the tubing wall (2

Expandable tubing (20) has a tubing wall (22) comprising a plurality of deformable tubular structures (24). The structures (24) have permeable walls and containing a filter medium (28) such that fluid may flow through the structures (24) and the filter medium (28) and thus through the tubing wall (22). he direction perpendicular to a cylinder axis. 4. A cylinder head structure in a multi-cylinder engine having a cylinder head and a cylinder block, comprising a collecting exhaust port which includes an exhaust collecting section within said cylinder head, said exhaust collecting section being formed by integrally collecting a plurality of exhaust port sections extending from a plurality of combustion chambers arranged along a cylinder array, wherein a protrusion is provided on a side surface of said cylinder head so as to project outside a side surface of said cylinder block, thereby defining the most projected part of said exhaust collecting section, and wherein a spark plug insertion tube is provided in said cylinder head at an inclination with respect to a cylinder axis and is positioned directly above said exhaust collecting section as viewed in the direction perpendicular to said cylinder axis, said spark plug insertion tube being connected to an area of said protrusion having said exhaust collecting section defined therein via a reinforcing wall. 5. A cylinder head structure in a multi-cylinder engine, comprising a collecting exhaust port which is comprised of a plurality of exhaust port sections extending from a plurality of exhaust valve bores arranged along a cylinder array, respectively, with a generally elongated wall portion disposed between consecutive ones of the exhaust port sections and associated exhaust valve bores and integrally collected together in an exhaust collecting section defined within a cylinder head, wherein said structure includes a protrusion having an arch-shaped side surface of said cylinder head to project outside a side surface of a cylinder block to which said cylinder head is coupled, said protrusion projecting outwards in a largest amount in said exhaust collecting section with an exhaust outlet formed generally centrally therein, wherein said cylinder head includes a spark plug insertion tube, a water jacket is interposed between an ignition coil mounted in an opening at an upper end of said spark plug insertion tube and said collecting exhaust port. 6. A cylinder head structure in a multi-cylinder engine, comprising a collecting exhaust port which is comprised of a plurality of exhaust port sections extending from a plurality of exhaust valve bores arranged along a cylinder array, respectively, with a generally elongated wall portion disposed between consecutive ones of the exhaust port sections and associated exhaust valve bores and integrally collected together in an exhaust collecting section defined within a cylinder head, wherein said structure includes a protrusion having an arch-shaped side surface of said cylinder head to project outside a side surface of a cylinder block to which said cylinder head is coupled, said protrusion projecting outwards in a largest amount in said exhaust collecting section with an exhaust outlet formed generally centrally therein, wherein said cylinder head includes a spark plug insertion tube inclined toward said exhaust collecting section with respect to a cylinder axis, said spark plug insertion tube being connected with an upper surface of said protrusion by a reinforcing wall. 7. A cylinder head structure in a multi-cylinder engine, comprising a collecting exhaust port which is comprised of a plurality of exhaust port sections extending from a plurality of exhaust valve bores arranged along a cylinder array, respectively, with a generally elongated wall portion disposed between consecutive ones of the exhaust port sections and associated exhaust valve bores and integrally collected together in an exhaust collecting section defined within a cylinder head, wherein said structure includes a protrusion having an arch-shaped side surface of said cylinder head to project outside a side surface of a cylinder block to which said cylinder head is coupled, said protrusion projecting outwards in a largest amount in said exhaust collecting section with an e