| 摘要 |
PROBLEM TO BE SOLVED: To raise a preload performance. SOLUTION: When the pressure in the oil pressure chamber Ra for return and rear side oil pressure chamber Rb for preload is removed and the high pressure hydraulic oil is supplied sufficiently to the front side oil pressure chamber Rc for preload, a push-press member 8 is push-pressed to the rear side through an intermediate member 16 until a front side piston member 13 is collided against a stopper member 14 and the preload is added to a rear side rolling bearing 5. The preload pressure at this time is made to a fixed position preload. When the hydraulic oil is supplied to the oil pressure chamber Ra and oil pressure chamber Rb and the pressure in the front side oil pressure chamber Rc for preload is removed, the force added the energizing force of a preload spring 17 to the pressure difference (A1<A2) between the oil pressure force of the oil pressure chamber Ra and the oil pressure force of the oil pressure chamber Rb is actuated as the preload. When oil passages 3a, 3b are closed under this state, as a movable sleeve member 7 and rear side piston member 9 are fixed by the non-compression property of the hydraulic oil, the preload is made to the fixed position preload by the hydraulic oil.
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