| 摘要 |
958,922. Variable-speed epicyclic gear; oneway acting brakes. E. F. PULS, [trading as PULSGETRIEBE ERICH FRIEDRICH PULS]. Oct. 30, 1962 [Oct. 30, 1961], No. 40961/62. Headings F2D and F2E. In a motor-vehicle epicyclic change-speed gear having a series of planetary trains wherein the reaction member of each train is selectively clutched through a multi-plate friction clutch to the respective input member of each train for direct-drive or braked through a multi-plate friction brake to the casing for two-way reduced drive, centrifugally - released spring - engaged, one-way acting brakes, each comprising shoes pivotably attached to brake levers mounted on pivot pins around the periphery of the reaction member, maintain forward drive in the reduced ratios during a shift-interval (and at all times) by preventing backward rotation of the reaction members to provide smooth changes without power interruption. Gear arrangement. A planet gear, driven from an input shaft 3 through gears 4, 5 comprises two sun-planet trains in series providing three reduced ratios and direct drive by two oil-operated friction disc clutches 7, 22, two oil-operated friction disc brakes 15, 32, and two one-way overrunning friction brakes 18, 31. Stepped planets 13, 12 and 25, 24 mesh suns 19, 20 and 26, 27 respectively of first and intermediate shafts 6, 21, and a final shaft 28 fast with an output shaft 2, the planet carriers 8, 23 being selectively clutchable by the clutches 8, 33, to the suns 19 and 26, and braked to a casing 1 by the two-way lock-up brakes 15, 32, the one-way overrunning brakes 18, 31 maintaining forward drive at all times in the reduced ratios. Ratios are as follows: First, reduced-reduced is by holding the planet carriers 8, 23 by the brakes 15, 32 for two-way low, both trains reducing; second, directreduced is with the brake 32 still engaged together with the front clutch 7, the brake 18 overrunning; third, reduced-direct is with the front brake 15 re-engaged together with the rear clutch 22, the brake 31 overrunning; fourth, speed, direct-direct is by engaging both clutches 7, 22, both brakes 18, 31 overrunning. The one-way acting brakes 18, 31, comprise six spring-engaged, centrifugally disengaged shoes 182, Fig. 2, having sintered friction facings formed with tread patterns. Each shoe is pivoted on a lever 18 pivoted on the respective planet carrier 8 or 23, the levers being formed with centrifugal masses 183 and connected at each side by tension springs 186, or in Fig. 4 (not shown) compression springs, which are arranged to give unequal leverage resulting in a nett expansible bias to the shoes, the radially outward movement of the shoes during engagement being limited by stops formed by the inner surface of the centrifugal masses.
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