Transmission for farm tractor |
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| 申请号 | US3733912D | 申请日 | 1971-05-24 | 公开(公告)号 | US3733912A | 公开(公告)日 | 1973-05-22 |
| 申请人 | KUBOTA LTD; | 发明人 | MURAYAMA Y; MORIMOTO T; KINOSHITA M; YAMANISHI I; | ||||
| 摘要 | A transmission comprising a primary speed change mechanism including a main shaft provided with a plurality of gears for power transmission, an upper counter shaft and a lower counter shaft disposed in parallel on the opposite sides of the main shaft, the upper counter shaft being provided with a group of speed change gears for running the tractor, the lower counter shaft being equipped with a group of speed change gears for power takeoff. The upper counter shaft is coupled with a secondary speed change mechanism including a bevel pinion shaft which is provided with gears in meshing engagement with gears on the extension of the upper counter shaft and a bevel pinion meshing with a bevel gear. The lower counter shaft also extends in parallel relation to the upper counter shaft and is coupled with a power takeoff shaft so as to provide live power takeoff independent of the speed of the tractor and ground power takeoff in synchronism with the speed of the tractor. | ||||||
| 权利要求 | 1. A transmission for a farm tractor comprising a primary speed change mechanism and a secondary speed change mechanism, said primary speed change mechanism including three shafts of a main input shaft provided with a plurality of gears for power transmission, an upper counter shaft provided with a group of speed change gears for running the tractor and a lower counter shaft provided with a group of speed change gears for power takeoff, said upper and lower counter shafts being disposed in parallel on the opposite sides of said main shaft with said main shaft interposed therebetween, said groups of speed change gears for running and power takeoff being in meshing engagement with said gears on said main shafts, respective corresponding gears in opposite relation in said groups of speed change gears having the same number of teeth, said secondary speed change mechanism including an extension extending from the rear end of said upper counter shaft and provided with gears and a bevel pinion shaft provided with gears meshing with said gears on said extension and a bevel pinion meshing with a bevel gear, said lower counter shaft being provided at its rear end with an extension coupled with a power takeoff shaft. 2. The transmission for a farm tractor as set forth in claim 1 wherein a clutch is intermediately disposed in a power transmission system for running the tractor comprising said upper counter shaft and said upper counter shaft extension. 3. The transmission for a farm tractor as set forth in claim 1 wherein a clutch is intermediately disposed in a power transmission system for running the tractor comprising said upper counter shaft and said upper counter shaft extension and another clutch is intermediately disposed in a power transmission system for power takeoff comprising said lower counter shaft, said lower counter shaft extension and said power takeoff shaft. 4. The transmission for a farm tractor as set forth in claim 1 wherein said power takeoff shaft of a power transmission system for power takeoff comprising said lower counter shaft, said lower counter shaft extension and said power takeoff shaft is provided with a gear, said bevel pinion shaft constituting said secondary speed change mechanism being provided with a gear meshing with said gear on said takeoff shaft, a clutch for meshing and de-meshing said gears being interposed between said power takeoff shaft and said lower counter shaft extension. |
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