Patent ID: 7150697
Filing Date: 2006-12-19
Classification: F16D,F16H,Y10T

Abstract:
1. A gearbox ( 1 ) for motor vehicles, intended to be connected to the output side of a basic gearbox and comprising an input shaft ( 2 ) from the basic gearbox, an output shaft ( 3 ) to a transmission, a planetary gear ( 4 ) arranged between the input shaft ( 2 ) and the output shaft ( 3 ), a ring gear ( 18 ) of the planetary gear is axially displaceable by a first member ( 27 ), a first coupling ring ( 10 ) that engages a high-range mode, and a second coupling ring ( 16 ) that engages a low-range mode, the coupling rings ( 10 , 16 ) and the ring gear ( 18 ) alternatively engage at least one synchronizing member ( 15 ) with at least one friction surface ( 14 , 22 ), wherein the synchronizing member ( 15 ) is configured to synchronize the rotational speed difference between the ring gear ( 18 ) and one of the coupling rings ( 10 , 16 ) by interaction with a corresponding friction surface ( 13 , 23 ) arranged on each coupling ring ( 10 , 16 ), the synchronizing member ( 15 ) and the second coupling ring ( 16 ) are coaxially arranged outside the ring gear ( 18 ), a second engagement member ( 25 ) configured to engage at least the second coupling ring ( 16 ) and a third engagement member ( 25 , 25 b ) configured to drive said synchronizing member ( 15 ) are arranged on a radially external side of the ring gear ( 18 ), and the second coupling ring ( 16 ) is arranged between the synchronizing member ( 15 ) and the first member ( 27 ).