Patent ID: 6837524

Claim:
A hose clamping structure comprising: a metal pipe having an inserting end portion straightly extending in an axial direction at one end and having a ring-shaped projecting portion at a leading end of the inserting end portion; a rubber hose insertedly fitted to an entire outer surface of the inserting end portion of said metal pipe by press-fitting and secured thereto in an unbonded manner; and a metallic tubular sleeve member mounted to an outer surface of said rubber hose and extending over a substantially full length of said inserting end portion, and tightened from outside toward an axial center direction along a circumferential direction to clamp said rubber hose to said metal pipe, wherein said sleeve member is tightened in a two-stage tightening operation where the sleeve member is tightened at two portions apart from each other in an axial direction, and a first tightening portion at the leading end side of said inserting end portion is longer in length than a second tightening portion inwardly located in an axial direction, and said first tightening portion extends to reach the leading end of said inserting end portion, said first tightening portion is formed by an integral unit including a tubular portion substantially parallel to an axial direction at an inner end side in an axial direction, and a tapered portion tapered and widened into a conical share from said tubular portion toward the leading end of said inserting end portion, and a portion of said rubber hose provided between said first tightening portion and said ring-shaped projecting portion of said metal pipe is compressed only by the tapered portion.