| 摘要 |
A power transmission system includes a rotatable and drivable first shaft (1a) adapted for co-action with a motor (1c) included in a planetary gear arrangement (P), and further includes a second shaft (8) that can be driven by the planetary gear arrangement. The planetary gear arrangement (1) includes a centrally positioned sun gear (1b) that co-acts with said first shaft, a plurality of planet gears (1d) that can co-act with the sun gear, and a ring gear (1e) that co-acts with the planet gears, and a gear or wheel (1f) that holds the planet gears. A hydraulic system (10) belonging to the planetary gear arrangement (P) includes a pump unit (10a) and a motor unit (10b) among other things. The ring gear (1e) can be braked via a first coupling unit (3), so as to be stationary in relation to a chassis (4) in a low speed range, but free for rotation in a higher speed range. The first shaft (1a) functions to cause the sun gear (1b) to rotate. The hydraulic pump unit (10a) is coupled directly or indirectly to the gear (1f) that holds the planet gears. The hydraulic motor unit (10b) is coupled directly or indirectly to the second shaft (8). In a chosen high speed range, a second coupling unit (5) functions to co-ordinate the rotary movement of the ring gear (1e) with the rotary movement of the hydraulic motor (10b). |
