Patent ID: 6196944
Filing Date: 2001-03-06
Classification: F16D,F16H,Y10T

Abstract:
A multiple-speed transmission for a motor vehicle, the multiple-speed transmission having a main transmission with a range change planetary transmission (12) mounted to an output side thereof, the range change planetary transmission (12), comprising a sun gear, a planetary carrier supporting at least one planetary gear, and a ring gear, the main transmission having an output shaft (2) which supplies an input to the range change planetary transmission (12), and a synchronizer assembly (1) being supported by the output shaft (2) of the main transmission for conveying driving power from the output shaft (2) as an input to the range change planetary transmission (12);wherein the synchronizer assembly (1), when in a first position, is coupled to the sun gear of the range change planetary transmission (12) to produce is a reduction ratio between the output shaft (2) of the main transmission and an output shaft (4) of the range change planetary transmission (12), and the synchronizer assembly (1), when in a second position, is coupled with the planetary carrier of the range change planetary transmission (12) to produce a direct connection between the output shaft (2) of the main transmission and the output shaft (4) of the range change planetary transmission (12);the sun gear (3) of the multiple-speed transmission meshes with the at least planetary gear (6), and the at least planetary gear (6) is rotatable about a spindle shaft (13) carried by the planet carrier (5), and the planet carrier (5) is fixedly connected to the output shaft (4) of the range change planetary transmission (12);the at least one planetary gear (6) also meshes with an inwardly facing gearing of the ring gear (7), and the ring gear (7) is connected to a housing (8) of the multiple-speed transmission to prevent rotation of the ring gear (7) relative to the housing (8);the synchronizer assembly (1) comprises a sleeve (15) axially slidably along the output shaft (2), and the sleeve (15) has an inwardly facing gearing (16) which meshes with a corresponding gearing of the output shaft (2) and has an outwardly facing gearing (21) which meshes with a corresponding gearing of a second synchronizer unit (19, 20);the sliding sleeve (15) is axially movable toward a first synchronizer unit (17,18) and toward the second synchronizer unit (19, 20), the first synchronizer unit (17, 18) comprises a first clutch body (17) and a first synchronizer ring (18) and the second synchronizer unit (19, 20) comprises a second clutch body (19) and a second synchronizer ring (20);the sun gear (3) is integral with the first clutch body (17), the first clutch body (17) has a tapered segment located to mate with a mating tapered section carried by the first synchronizer ring (18), and the first synchronizer ring (18) has an outer gearing (18a) located to engage with the inwardly facing gearing (16) of the sleeve (15);the first synchronizer ring (18) has a recess which accommodates a first locking body (22) and the first locking body (22) acts radially inwardly upon the first synchronizer ring (18), and the second synchronizer ring (18) has a recess which accommodates a second locking body (23) and the second locking body (22) acts radially outwardly upon the second synchronizer ring (20);the inwardly facing gearing (16) has a first radial spline (24) and the first radial spline (24) is shaped to transmit an axial force from the sliding sleeve (15) to the first synchronizer unit (18, 20) and produce a frictional contact between the mating tapered segments of the first clutch body (17) and the first synchronizer ring (18);the outwardly facing gearing (21) has a second radial spline (24) and the second radial spline (24) is shaped to transmit an axial force from the sliding sleeve (15) to the second synchronizer unit (19, 20) and produce a frictional contact between the mating tapered segments of the second clutch body (19) and the second synchronizer ring (20), and the clutch body (19) is firmly coupled to the planet carrier (5).