| 摘要 |
PURPOSE:To prevent the occurrence of a braking phenomenon at the time of low speed, sudden turning without fail, by making an allowable state in revolving speed difference between front wheels and rear wheels so as to be adjustable according to a running state of a car. CONSTITUTION:During car driving at four-wheel drive,when rear wheels cause slip and a revolving speed at the rear-wheel output shaft side is speedier than that at the front-wheel output shaft side, a rotor 69 relatively rotates. With this rotation, oil is sucked in suction and discharge ports 73, 75 and 77 through a second oil passage OL2 from an oil tank 80 by way of a check valve 79, and then discharged out of a check valve 82 with an orifice 82a from suction and discharge ports 72, 74 and 76 of a pump houses 86-88 by way of a first oil passage OL1. Since this discharge pressure is a value corresponding to a revolving speed difference between the rear-wheel output side and the front- wheel output shaft side, size of torque to be transmitted by an oil pump 14 also comes to be varied according to the revolving speed difference.
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