In particular, hydraulic clutch gearboxes allow a very smooth and gradual transfer between the various ratios of the gearbox independently of the manner in which the operator has effected the gear shift manoeuvre, and in addition make it possible to dispense with the use of a conventional friction clutch since its function is performed by the hydraulic clutches. This object is achieved in accordance with the invention by forming said reduction means of the gearbox with first and second mechanical reduction stages interconnected in series with each other by a hollow transmission shaft which surrounds a portion of said input shaft, the first stage being constituted by an epicyclic gear mechanism which coaxially surrounds the input shaft and the transmission shaft and includes a crown wheel fast for rotation with the input shaft, a planet carrier fast for rotation with the transmission shaft and selectively connectable with the input shaft by means of a hydraulically controlled friction clutch, and a sun wheel selectively lockable with respect to the casing by means of a hydraulically controlled friction brake, the second stage being constituted by at least two pairs of continuously meshing gears, disposed physically between the first stage and the final stage, and each comprising a driven gear wheel keyed on an input drive shaft of the final stage and a driving gear wheel which coaxially surrounds the transmission shaft, the driving gear wheels being selectively connectable to the transmission shaft by means of respective hydraulically controlled friction clutches which surround the transmission shaft.
It is called a rotational reverse gearbox and parallel offset in the versions with parallel shafts with two gearboxes. 3 is a schematic representation of the gearbox showing only the various hydraulic and mechanical controls; and.
For standard products, the payment is: 30% T/T in advance ,balance before shipment. As shown in FIG. Ever-Power began supplying power transmission equipment for agricultural machinery in 2001. The rear end portion 40 of the output shaft 38 projects from the casing 14 beneath the end portion 32 of the input shaft 28 and is connected, by means of a second transmission shaft 42, to a differential 44 contained in the back axle casing 15 and serving to transmit motion to the rear wheels of the tractor.
We promise will offer the best price by the high quality in china! The gearbox is the main mechanical component of the kinematic chain of agricultural machines. The two pairs of gears of the second stage 48 permit two further reduction ratios to be selectively obtained, for example equal to 1:0.875 for the pair 78-82 and equal to 1:0.68 for the pair 76-80. 2 and 3). The front end portion 30 of the shaft 28 extends into the compartment 16 and is centred in the flywheel 22. Gearboxes of the above form are generally all mechanical with both the final stage and the reduction means being constituted by reduction gear units of similar form, that is, comprising a pair of parallel shafts selectively interconnectable by pairs of continuously meshing gears. Free format text: FIG. To this end, a pulley or drum 138 (FIGS. 3, but not visible in FIG. A gearbox according to claim 1 or claim 2, wherein the output drive shaft of the reduction means has an associated band brake selectively operable to facilitate the operation of gearing range selection by holding the shaft stationary during said operation. The first and second stages 46, 48 are hydraulically controlled by means of a hydraulic distributor unit 124 (FIGS. Generally the maximum speed of most models is 65 km/h (40 mph), but other speeds both slower (40 km/h) and faster (80 km/h) are produced. The driven part of the joint 26 is keyed onto this shaft portion 30. Transmission speed high number of gears for agricultural tractors and similar vehicles, Forward reverse switching device for a work vehicle, in particular a tractor, Automatic transmission for four wheel drive automotive vehicles, Gear shifting apparatus of a transmission for a four-wheel drive vehicle, Automatic transmission for automotive vehicles, Automatic transmission for motor vehicles, A gearbox with electronically-controlled hyraulic clutches, for agricultural tractors and similar vehicles, Traveling System Auxiliary Speed Change Device, Multiple hydraulic multi-plate clutch transmission for vehicle, Speed-change gear for vehicle - has spur gear and planetary gear with hydraulic coupling, Change speed constant mesh gear box: gear ratios selected by clutches, Transmission shaft carrying at least two gears, A vehicle transmission having gear ratios in a main gearbox overlapping gear ratios in an auxiliary gearbox, Indirect manual transmission for off-road vehicles, Transmission mechanism for a working vehicle, Power shift planetary and countershaft transmission, Improvements in variable speed power transmission devices, Transmission between two shafts in both directions of travel at different speeds by remote control, Multi-ratio transmission and controls therefor, Gears change gears in group design-for motor vehicles, Gearbox with electronically-controlled hydraulic clutches, for agricultural tractors and similar vehicles, Torque transfer device for a four wheel drive vehicle, Power transmission having power take-off shaft and fluid control means therefor, Transmission and PTO system for tractors and utility cycles, Transmission module and transmission assembly method, Variable ratio power transmission mechanisms, Split power transmission to include a variable drive, Coupling arrangement with a planetary gear, Hydrostatic-mechanical power distribution transmission, Stepless composite hydrostatic-mechanical transmission, Gear-change transmission with differential, Differential apparatus with additional speed increasing gear and speed decreasing gear selectively engageable with a single output shaft. The gearbox is the main mechanical component of the kinematic chain of agricultural machines. The casing 14 has an elongate form in the longitudinal direction of the tractor. The sprocket 102 meshes with a gear wheel 108 freely rotatably mounted on the output shaft 38. Order: 10 Pieces Oil - bath multiple disc friction brakes and clutches such as may used in the present gearbox tend to transmit a torque to the driven members even when these clutches and brakes are disengaged due to viscous drag effects.
A slidable clutch sleeve 110 permits the output shaft 38 to be selectively connected fast for rotation either with the drive shaft 74 by means of a dog clutch formed on the sprocket 98, or with the gear wheel 108 by means of a dog clutch formed on this latter.
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