POWER TAKE-OFFS 4-9 E UROCARGO Euro 4/5 Power take---off from engine 4.5 Power take-off from engine In general the use of these power take-offs is planned for apparatus requiring a continuous power supply. 4.5.1 Taking torque from engine front side The drive take-off from the front part of the crankshaft is obtained, for limited power values to be drawn off (e.g. conditioning group commands) by the drive belt transmission, the use of cardan shafts is normally reserved for take-offs of a greater m agnitude (e.g. municipal use). These uses, when not specifically planned, require complicated interventions to the front part of the vehicle, e.g. modifications to the radiator, cab, bumpers etc.
Part icular attention must therefore be paid:
- to the system composed of additional masses and relative rigidity which must be flexibly disengaged from the crankshaft with regard to the torsional and flexional effects; - to the additional mass values and relative moments of inertia and to the distance from the centre of gravity of the masses from the centreline of the first main bearing which must be contained as much as possible; - to avoiding a reduction in the radiator cooling capacity; - to restoring the rigidity and resistance characteristics of the modified elements (cross member, bumper etc.); - to avoid exceeding, during extended use, temperatures of the engine cooling fluid of over 100 ° C and engine oil temperature (measured on the main duct of the pressure switch area) of 120 ° C.
A margin of approx. 10% should however be left. In other cases include supplementary heat exchangers. Table 4.3 shows the values to be referred to for the take-off. On the front of the engine a pulley is positioned with 2 races from which it is possible to draw power. The position of the take-off and the size of the pulley are given in the following figure. Figure 4.4 Engine front side Pulley for take-off 91605 Power take-off from engine Print 603.93.431 Base - January 2008