| 摘要 |
1. Auxiliary drive device for the drive, especially for the reversal of the drive of working means of a combine harvester (10), e.g. an elevator conveyer (25), independently of the main drive, with a hydraulic motor (86, 86') which has a rotatable drive element (104) which is selectively capable of being coupled by way of a switchable coupling to gear elements for the drive of the working means of the the combine harvester, characterized in that there is associated with the rotatable drive element (104) a hydraulically operable coupling which is responsive to a pressure such as lies somewhat under the response pressure for the drive of the hydraulic motor (86, 86'), in that the hydraulic motor (86, 86') as well as the hydraulically operable coupling are connected in parallel to a supply pump (174) by means of hydraulic lines (92, 92'), there being associated with the pump a normally closed pilot valve (184), which is so integrated in an electro-hydraulic circuit (46, 176-182) and operable by setting means, that the hydraulically operable coupling and the hydraulic motor (86) are simultaneously subjected to pressure medium, the pressure rise in the coupling attaining the necessary switching pressure to establish the drive connection between the hydraulic motor (86, 86') and the working means, before the response pressure for the drive of the hydraulic motor has been reached. |
