| 摘要 |
PURPOSE:To secure a sufficient amount of lubricant for a bearing which bears a driving rotor, establish stable performance, and enhance the durability by allowing the oil pressure, which flows out from a small path in communication with an oil pressure chamber, to be fed to the bearing. CONSTITUTION:A piston 17 of a hydraulic mechanism D is provided with a minor through hole 31, which is leading to an oil pressure chamber 18 formed inside of a taper cone 2 and which works as a small path for taking-out of the pressure oil heading to the ball part of a ball bearing 13 in adjoining condition. Lubrication of the ball bearing 13 is made with the pressure oil jetting out of this minor hole 31. A plane bearing 10 is also provided with an oil path 19, wherethrough the pressure oil from a pump B is fed to the slide surfaces permeatively. This constitution ensures that a sufficient amount of lubricant is fed to the bearing 13 which bears a driving rotor 2, and the stability and durability will be enhanced. |
