1300336, OPR, HYSTER, Hyster2, SRM

//-->.pos {position:absolute; z-index: 0; left: 0px; top: 0px;}DESCRIPTION AND OPERATIONGENERALThis section has a description and the operating princi-ples of the single speed powershift transmission. Thesection is in two parts. The first part describes the me-chanical components of the transmission. The secondpart describes the hydraulic operation of the transmis-sion.MECHANICAL DESCRIPTIONThe transmission has a housing, torque converter, oilpump, control valve and two shaft assemblies and anoutput gear.•Turbine•StatorTORQUE CONVERTER (See FIGURE 1.)The torque converter is installed between the engine andthe transmission. The torque converter has three mainparts:•ImpellerThe impeller is connected to the flywheel of the engineby a flexible disc. A flange on the impeller engages withthe oil pump for the transmission and operates the pumpwhen the engine is running.The turbine fits inside the impeller and engages with theinput shaft of the transmission. The stator also fits insidethe impeller and engages with the stator tube on thetransmission.1.2.3.4.5.6.7.TURBINEIMPELLERSTATORONE–DIRECTION CLUTCHSTATOR TUBETRANSMISSION INPUT SHAFTDRIVE PLATE7117589415FIGURE 1. TORQUE CONVERTER1OIL PUMP (See FIGURE 2.)1The transmission has its own hydraulic system. An oilpump is installed on the cover of the transmission and isdriven by the impeller of the torque converter. The trans-mission cover has passages for oil to flow to and fromthe oil pump.SHAFT AND CLUTCH ASSEMBLIES(See FIGURE 3.)The two shaft assemblies are: (1) the input shaft (withreverse clutch assembly) and (2) the forward clutchshaft.1. OIL PUMP11758FIGURE 2. OIL PUMP1.2.3.4.INPUT SHAFTFORWARD CLUTCH SHAFTOUTPUT GEAROUTPUT YOKE21124311758FIGURE 3. ARRANGEMENT OF THE SHAFTS2Input ShaftThe input shaft is driven by the engine through thetorque converter and rotates in the direction of enginerotation. The input shaft has the reverse clutch assem-bly. The clutch is installed in the reverse clutch housingand has a piston, friction discs, separator plates, a pres-sure plate and a return spring. The teeth on the reverseclutch housing are engaged with the teeth on the forwardclutch housing. The hub for the reverse clutch is en-gaged with the output gear.pressure plate and a return spring. The hub for the for-ward clutch is engaged with the output gear.OUTREVERSEOUTFORWARD116861.2.3.4.5.1.2.3.4.5.6.7.8.INPUT SHAFT ASSEMBLYREVERSE CLUTCH HOUSINGREVERSE CLUTCH ASSEMBLYREVERSE CLUTCH HUBFORWARD CLUTCH SHAFT ASSEMBLYFORWARD CLUTCH HOUSINGFORWARD CLUTCH ASSEMBLYFORWARD CLUTCH HUB11759REVERSE CLUTCH HUBOUTPUT GEARREVERSE CLUTCH HOUSINGFORWARD CLUTCH HOUSINGFORWARD CLUTCH HUBFIGURE 5. OPERATION OF CLUTCHASSEMBLIESClutch Assemblies(See FIGURE 4. and FIGURE 5.)The two clutch assemblies use the same parts and oper-ate in the same manner. The friction discs and separatorplates are installed in the housing in a sequence. Eachfriction disc is next to a separator plate. The separatorplates have a smooth surface while the friction discshave a friction material on the surface. The hub in eachclutch assembly engages with the inner splines of thefriction discs. The outer splines of the separator platesengage with the grooves in the clutch housing. A pres-sure plate holds the friction discs and separator plates inthe housing. A return spring keeps the piston retractedagainst the housing. There is an orifice in each piston.3FIGURE 4. CLUTCH ASSEMBLIESForward Clutch ShaftThe forward clutch shaft is installed next to the inputshaft. The teeth on the forward clutch housing are en-gaged with the teeth on the reverse clutch housing. Dur-ing operation, the forward clutch shaft rotates in the op-posite direction of engine rotation. The forward clutchassembly has a piston, friction discs, separator plates, aThe orifice releases any oil pressure in the piston hous-ing caused by centrifugal force after the clutch is disen-gaged. There is enough clearance in the clutch assem-blies to let the friction discs rotate freely when a clutchassembly is not engaged.Output Gear (See FIGURE 6.)The output gear is installed below the clutch shafts. Theoutput gear has splines for the yoke for the drive shaft.The output gear is driven by the hub for the engagedclutch (FORWARD orREVERSE).12117581. OUTPUT GEAR2. DRIVE SHAFT YOKEFIGURE 6. OUTPUT GEARHYDRAULIC OPERATIONTORQUE CONVERTER (See FIGURE 7.)The torque converter has two main functions. It worksas a fluid clutch to transfer power from the engine to thetransmission. Also, the torque converter multipliestorque. The torque of the engine is increased by thetorque converter when additional torque is needed tomove the lift truck. If the need for additional torque islow, the torque converter works as a fluid coupling.The impeller has a set of curved blades that send the oilout from the center of the impeller when the impellerturns. The oil is moving at high speed when it leaves theimpeller. Because the impeller is curved, the oil flowsinto the outer edge of the turbine. The oil pushes the tur-bine in the direction of the engine rotation. The oil thenflows from the outside to the center of the turbine. Theturbine blades change the direction of the oil flow so thatthe oil leaving the center of the turbine is going in the di-rection opposite of engine rotation. See FIGURE 7. Thestator is between the turbine and impeller in the center ofthe torque converter. When the oil hits the stator blades,the one–direction clutch prevents the stator from turn-ing against the engine rotation. The blades of the statorchange the direction of the oil so that the oil enters theimpeller in the direction of engine rotation. The statorpermits the torque converter to increase the torque of theengine. The force of the oil entering the impeller fromthe stator helps the impeller and engine turn.41231. TURBINE2. STATOR3. IMPELLER9418FIGURE 7. TORQUE CONVERTER OPERATIONAs the speed of the lift truck increases, the oil from theturbine flows toward the impeller. The centrifugal forceof the rotating turbine sends the oil that is in the turbineagainst the oil flow from the impeller. The oil moving inthis direction decreases the amount of oil flow to the im-peller from the stator. Because the oil flow to the impel-ler decreases, the additional force on the impeller de-creases. Less torque is available as the speed of the lifttruck increases.When the lift truck is traveling at a constant speed on alevel surface, the turbine and impeller turn at approxi-mately the same speed. The centrifugal force of the oil isthe same for both the impeller and turbine. The oil doesnot flow through the stator and no additional torque istransferred. The rotating oil hits the back of the statorblades and turns the stator in the direction of engine rota-tion. The one direction clutch permits the stator to turnwith engine rotation. The impeller, turbine, stator andoil rotate as a unit when there is no load on the turbine.When the lift truck starts up a ramp, the turbine has a re-sistance to turning. The centrifugal force of the oil in theturbine decreases. The oil again flows from the impellerthrough the turbine and stator and enters the impellerwith force. The torque converter again increases torquewhen the turbine speed is less than the impeller speed.SHAFT ASSEMBLIES (See FIGURE 9.)The input shaft and the forward clutch shaft have oil pas-sages that connect the clutch assemblies to the controlvalve and the lubrication circuit. Seal rings are installedon the shafts to make sure the oil flows to the correct pas-sages. The oil flow to engage a clutch enters at thegroove in the shaft. The oil flow for lubrication entersthe ports at the end of the shaft.1. OUTER RACE2. ROLLERS3. SPLINES ON INNER RACE9419FIGURE 8. ONE–DIRECTION CLUTCH5

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