| 摘要 |
PURPOSE:To have differential driving or free rotation due to a sufficient transmitted torque on an axle by furnishing a differential gearing mechanism, a friction clutch, a pilot clutch, and a force boosting mechanism which boosts the pilot clutch engaging force and transmits it to the friction clutch. CONSTITUTION:A pilot clutch 33 is left opened unless current is fed to an electric magnet 85, and a friction clutch 31 is opened, and the power of an engine 1 remains out of transmission to a differential gearing mechanism 25, and the rear axles rotate freely from each other. When current is fed to the electric magnet 85, an attraction member 87 is attracted, and friction plates 75, 79 are engaged with each other, and a cam ring 71 is connected with a ring gear 29 and a differential case 35. Now relative rotation is generated with a push- move member 69, and a ball 89 shoves this member 69 in the direction of moving apart from the cam ring 71, and the friction clutch 31 is engaged. The rotational power of the ring gear 29 is transmitted to a clutch member 49, and a bevel pinion 53 drives a left and a right bevel side gear 55, 57 differentially, and the rear axles are put in differential drive.
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