| 摘要 |
PCT No. PCT/FR94/00177 Sec. 371 Date Oct. 16, 1995 Sec. 102(e) Date Oct. 16, 1995 PCT Filed Feb. 17, 1994 PCT Pub. No. WO94/19624 PCT Pub. Date Sep. 1, 1994A transmission apparatus in which a differential-type transmission device has rotating elements with intermeshing teeth, one of which elements is connected to an input shaft and the other to an output shaft. One of the rotating elements is a reaction element, and the transmission apparatus has a selective locking mechanism mounted operatively between the reaction element and a housing of the transmission apparatus. The selective locking mechanism has a free-wheel for enabling the reaction element to rotate in the same direction as the input shaft and the output shaft when a selective connection device connects the rotating elements of said differential mechanism in order to cause direct drive operation. When the freewheel is locked, the reaction element is integral in rotation with a rotor of a brake which is able to be selectively released in order to release the rotor and the reaction element in relation to said housing. In a neutral condition the brake allows the reaction element to rotate in an opposite direction. The brake is furthermore able to be selectively and gradually activated so as to gradually immobilize the rotor in relation to the housing, whereby the reaction element is then selectively immobilized and allowed to rotate in the same direction as the input and output shafts.
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