| 摘要 |
The invention relates to a planetary gear type auxiliary gearbox intended to be inserted between a main gearbox and a transmission to the driving wheels in a motor vehicle. The input shaft (3) of the planetary gear (2) is rigidly connected to a sun wheel (7), while the output shaft (4) of the planetary gear (2) is rigidly connected to a planet wheel carrier (11) carrying a plurality of planet wheels (8) meshing with the sun wheel (7). The planetary gear (2) further includes a clutch ring (26) non-rotatably connected to the gearbox housing (1) and a clutch ring (16) non-rotatably connected to the input shaft (3). The invention is distinguished in that the ring gear (31) of the planetary gear (2) is formed with engagement teeth (33,34) at its axial ends, in that the clutch ring (16,26) are arranged on either side of the planet wheels (8) and in that the ring gear (31) is axially movable to enable alternative engagement with the clutch rings (16,26) by its engagement teeth (33,34). The invention results in favourable load distribution with regard to both torque and bending stresses. In addition, there is obtained a simple structure which allows the gearbox to be formed such that its length is comparatively short. |
