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1. (WO2018122460) TRANSMISSION SYSTEM FOR A VEHICLE AND A METHOD FOR CHANGING ROTATION SPEED OF DRIVE SHAFTS OF A VEHICLE

Pub. No.:    WO/2018/122460    International Application No.:    PCT/FI2017/050947
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: B62D 11/12
B62D 11/16
B60K 17/04
Applicants: FINNCAT OY
Inventors: POHJOLA, Kalle
POHJOLA, Heikki
Title: TRANSMISSION SYSTEM FOR A VEHICLE AND A METHOD FOR CHANGING ROTATION SPEED OF DRIVE SHAFTS OF A VEHICLE
Abstract:
A transmission system for a vehicle comprises a primary shaft (10), a first planetary gear train (22a) and a second planetary gear train. The planetary gear trains comprise a ring gear (12), a carrier (14) for supporting planet gears (26), a first drive shaft mounted on the carrier of the first planetary gear train, a second drive shaft mounted on the carrier of the second planetary gear train, as well as secondary transmission devices for changing the rotation speeds of the ring gears of the first and second planetary gear trains. The secondary transmission devices comprise first control devices for changing the rotation speed of the ring gear of the first planetary gear train, and second control devices for changing the rotation speed of the ring gear of the second planetary gear train, the first and second control devices being independent of each other. Preferably, the ring gears are equipped with an external toothing (34), and said first and second control devices comprise a self- locking worm (20) arranged to engage the external toothing, and a control motor (18) for spinning the worm. In the method, the rotation speeds of the drive shafts of the vehicle are changed by adjusting the rotation speeds of the ring gears by secondary transmission devices independently from each other.