| 摘要 |
A two speed gear box employs a planetary gear mechanism in which the planet carrier is in the form of a pinion gear which drives the second stage of the gear box. The gear box includes hydraulically actuated clutches which, in high gear, selectively lock the sun gear for rotation with the input shaft, and, in low gear, selectively lock the sun gear with respect to the housing so that the carrier pinion is driven at the speed with which the axes of the planet gears rotate about the sun gear. The annular gear includes an outwardly extending gear rack adapted to engage a generator driving mechanism. Pressurized fluid lubricant is provided to the generator housing and to the interior of the gear box housing. Expelled generator lubricant, still at relatively high pressure, powers an ejector to positively scavenge the fluid out of the gear box and return it to a cooling reservoir obviating the need for a separate scavenging pump. Low pressure fluid is pressure amplified and accumulated until needed for actuation of the hydraulic clutches which uses less energy than a pump under conditions of infrequent shifting. |
