| 摘要 |
<p>A hydro-mechanical change speed mechanism of the type useful in road sweeping vehicles and the like in which the vehicle is required to travel from place to place at normal road speed but also requires the ability to travel at a relatively reduced speed whilst carrying out its main function such as road sweeping. The change speed mechanism herein disclosed is inserted into the normal drive train so that the input shaft (11) forthe mechanism mates with the output shaft from a vehicle gear box and the output drive shaft from the mechanism (12) drives the driven wheels of the vehicle via a cardan shaft. A selector mechanism (41, 42, 43) enables the inputand output shafts (11 and 12) to be mechanically directly connected together, or via respective first and second gear trains (15 and 16), to a vehicle drive pump (13) and a hydraulic motor (17) respectively. A hydraulic connection between the vehicle pump (13) and the hydraulic motor (17) results in an alternative hydraulic coupling between the input and output shafts (11 and 12). The first and second gear trains (15 and 16) are displaced to either side of a central longitudinal plane including the axes of the input and output shafts (11 and 12) so that the vehicle drive pump (13) and the hydraulic motor (17) can be accommodated in a place saving arrangement alongside one another. Further drives (14, 30) are available for auxiliary equipment. The arrangement also features a novel housing arrangement and novel selector mechanism.</p> |
