The compactors trucks 6X2 use hypoid rear axle with pusher system causes the application. The suspension characteristics for pusher system with hypoid axles increase the universal joint angle at transmission side and at rear axle side. The drive shaft geometry is approved for the application however the angles of universal joint are at border line for torsional and inertial acceleration according to supplier application sheet approval. Evaluation on the test vehicles at 12% and 20 % uphill ramp were confirmed a judder vibration at 1 st gear between 1600 and 1800 rpm during start/stop test and between 65 and 85km/h. To solve this vibration was requested to rear axle supplier to send 3D model to evaluate new amboid rear axle design regarding to accelerations analysis. After assembly at Digital Mock up (DMU) was verified the improvement regarding universal joint angle reduction and also the possibility to reduce some others components and have a cost reduction also. The new application sheet shows a low acceleration (torsional and inertial), increase the B 10 estimated life and increases the critical speed for the drive shaft also. The new concept was assembled and tested in parallel of the current one and we could confirm the judder vibration was eliminated at 12% and 20% uphill ramp between 1600 and 1800 rpm and between 65 and 85km/h. the patent regarding an amboid rear axle application at compactors trucks 6X2 pusher was requested.

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Construção de uma bancada didática de performance Building a performance teaching bench

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A theoretical analysis of the influence of the flow of a coolant containing silver nanoparticle (Ag) in an automotive radiator is presented. The coolant fluid is composed of water or an aqueous solution of Ethylene-Glycol (EG50%) and silver nanoparticles. Ethylene glycol (EG) has been used in automobile radiators for many years due to its compatibility with metals and its anti-cooling properties. Silver nanoparticles are being incorporated into the development of high-precision surgical equipment. It is shown that the rate of heat transfer increases significantly using silver nanoparticles and ethylene glycol and water. There is a maximum for heat exchange between fluids in all analyzed coolant flows-the maximum moves to higher airflow rates when the coolant flow rate is increased. However, the energy dissipation in the stream also increases, but the relationship between the energy dissipated in the flow and the energy transferred in the form of heat is low, which justifies the use of silver nanoparticles and ethylene glycol, or silver nanoparticles and water as a coolant in the automotive vehicle radiator.