when starting, both coupling parts are actuated, and the two shafts are connected rigidly by a switching sleeve.our company is professional pg电子下载-pg电子游戏,piston motor,hydraulic winch,gearbox,hydraulic steering unit supplier providing customers from domestic zhongyiyepk and overseas the best and reliable hydraulic products.welcome to visit our website. when reaching the slip-free condition at the coupling part of the lowest gear stage, the switching sleeve has to be disengaged, thereby generating a switching pressure.
it is therefore an object of the invention to provide a gearbox of the initially mentioned type which, on one hand, retains its design and preferably does without a separating coupling arranged between the engine shaft and the input shaft and, on the other hand, permits safe starting in both the forward and reverse gear.
the objective is achieved in every respect. both when starting in forward gear and when starting in reverse gear, the couplings of the two first gear stages are loaded simultaneously and in a way which excludes thermal overloading. by distributing the pairs of gearwheels onto the two intermediate shafts it is possible to achieve a particularly short design.
as described in publications referring to the relevant state of the art, the friction couplings of the individual gear stages may be actuated electro-mechanically, with one axial actuating device alternatively loading the friction couplings of structurally adjoining, non-successive gear stages. however, it is also possible to use prior art individual hydraulic or pneumatic actuating elements to load the friction couplings of the individual gear stages. within a very short space it is possible to use a five or six gear gearbox for incorporation into a transversely arranged engine/gearbox unit in a vehicle.
when the gearbox is driven in gear stages g5 and g6 at a high engine speed. when driving forward and reversing under overrun conditions in gear stage g1, the freewheeling unit remains closed. when reversing normally, it is necessary to bridge the freewheeling device.
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