| 摘要 |
A power transmission comprises one or more sequential modules each including a modular portion of an enclosure for the complete transmission, a planetary gear set, a direct drive clutch, a self-energizing reduction brake and a hydraulic control system preferably adapted to substantially simultaneously condition the direct drive clutch and reduction brake for establishing either a direct or reduction drive mode for each module. The self-energizing reduction brake is a friction device providing an automatically operable coupling between rotatable elements and includes a first friction component having a plurality of friction discs and a second split friction component having friction discs interleaved with those of the first component, split portions of the second friction component being axially movable by engagement with circumferentially spaced-apart, spiral teeth on the fixed housing for causing engagement and disengagement of the friction discs with control apparatus being operable to maintain the split portions of the second friction component in spaced-apart relation to assure disengagement of the reduction brake.
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