| 摘要 |
PURPOSE:To eliminate propeller shaft on a floor and to enable a floor surface in a car room to be widely used by flattening the floor surface, by a method wherein, in 4-wheel drive, the side of either wheel of front and rear wheels is driven through transmission of a pure oil pressure. CONSTITUTION:When automatic 4-wheel drive is indicated on a calculator 4, the calculator 4 closes a bypass valve 2h in a state that a clutch 3 is left disengaged and detects the rotation speeds of drive shafts 2a and 3c. Further, it controls the displacement volume of a hydraulic motor 2f. The control performs a pumping action by means of the hydraulic motor 2f driven by means of front wheels 2p and 2q. Pressure oil delivered through the pumping action causes driving of a hydraulic pump 2, and through regulation of a flow rate of pressure oil fed to the hydraulic pump 2 by control of the volume of the hydraulic motor 2t, the rotation speed of the drive shaft 2a. The control is effected so that the rotation speed of the drive shaft 2a normally follows a change in the rotation speed of the drive shaft 3c.
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