one gearwheel of each pair of gearwheels is rotatively fixedly connected to one of the two shafts and the other gearwheel of each pair of gearwheels is optionally rotatively fixedly connectable to the other of the two shafts by a respective friction coupling.that is to say, choosing hydraulic motor for the goods are not as simple as people normally thought it is. it demands that company understand deeply their produce piston motor,hydraulic winch,gearbox,pg电子下载-pg电子游戏 hydraulic steering unit,axial piston motor products and scale to get suitable ones.
also, in the gearbox, the input shaft is rotatively fixedly connected to an engine shaft; mechanism to reverse the direction of rotation is provided in the torque flow from the input shaft to the output pinion; and mechanism for approximately simultaneously loading the friction couplings of the two lowest gear stages is provided and for starting purposes when driving forward and reversing, the torque flow through both friction couplings is maintained, at most, until an identical speed has been reached between the elements of the friction coupling of the lowest gear stage.
a gearbox of this type is known from de 40 07 506 c1 which describes a simply designed gearbox switchable under load. the gearbox is similar in design to manual gearboxes and can be produced at reasonable cost. when starting, the relatively small friction couplings provided for changing gears are subjected to high thermal loads both in the forward and reverse gear. the thermal loads may reach critical values. because of its length, a gearbox of this type is directly connected to the engine and is less suitable to be arranged transversely in the vehicle.
here, an input shaft is connected to an outer coupling part which accommodates two inner coupling parts connected to separate coaxial shafts. when starting in forward gear, the gearwheels of the two lowest gear stages are engaged. starting in forward gear is achieved by both coupling parts, and in addition to the switching sleeve of the lowest gear stage, a switching sleeve of the next higher gear stage is actuated at the same time, with the power flow being disconnected in one of the gear stages when the starting speed of the coupling of one of the gear stages has reached the input speed. contrary thereto, when starting in reverse gear, only one of the coupling halves is loaded. here, the double coupling is longer than the conventional coupling of a manual gearbox. because of its design, the gearbox is less suitable to be arranged transversely in a vehicle.
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