A return pipe is constituted by assembling a pair of return pipe halves split along a non-load passage. A pipe hold down member is fixed to a nut member so as to straddle the return pipe, fixing the return pipe to the nut member. A flange is formed on each of the return pipe half bodies, while a pair of fixing leg portions covering the flange of each return pipe half is formed on the pipe hold down member. Fastening members penetrate through the fixing leg portions of the pipe hold down member and the flanges of the return pipe halves and are fastened to the nut member. When the fixing leg portions are fixed to the nut member by the fastening members, an engagement portion of the pipe hold down member tightens the pair of the return pipe halves in the direction where split faces of the halves are butted against each other.
展开▼
