| 摘要 |
PURPOSE:To improve the pulling-out force which will be produced when a slippage occurs by controlling a pressure in an operating chamber by an external operation to move a piston to press resistance plates between so that a resistance force can be produced. CONSTITUTION:Sensors 51 and 52 sense a state of road surface. A controller 53 contantly makes judgment on the data of the state at the driving time. At a point when a wheel is likely to go to a rough road having a probability of slippage, the controller 53 generates a working fluid pressure converting command. A regulator 55 then increases pressure of working fluid. The increased pressure is transmitted from a conduit 57 to a working chamber 33 via a connector 59. A piston 27 is thereby moved by a thrust force to press a block, thereby having resistance plates 35 and 37 make close contact with each other to produce friction value to a preset value. The pulling-out force at the occurrence time of slippage can be improved.
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