H4-VV-20-D has grown to its current level of diversity Near Helical speed reducers H4

Flender/Flender Gear Units/Helical speed reducers H4

gearbox that contains the testing gearset. The torque measurement system is applied to the connecting shaft of the big wheels. The back-to-back connection is closed by the shaft linking the pinions of the spur gearboxes using hydraulic bracing unit. The bracing unit consists of hydraulic turning motor that receives hydraulic lubricant through rotary feed-through. The change of load level and direction is controlled by proportional and way valve. The valves are controlled via computer, allowing an exact adjust - ment of the applied torque in operation. Therefore, load collectives and change of torque direction are possible. The lubrication systems of the test and of the power return gearbox work sep-arately and have their own lubrication tank. The lubricant injection systems are equipped with temperature-regulated cooling water valves and heat exchang-ers. Furthermore, extra cooling devices keep the room temperature at constant level. The lubrication system of the test gearbox has additional immersion heaters that heat the lubricant to the desired test temperature before test start. The tank is filled with 6 of the test lubricant; from there the lubricant is pumped with flow rate of 1 /min to the injection nozzles within the gearbox housing. The lubri-cant is injected into starting and ending mesh via flat fan nozzles. More injection nozzles are directed to the bearings for lubrication.Several measurement systems with torque, temperature and vibration sen-sors serve to document the operating condition for further test evaluation. Furthermore, facility of this size needs intensive monitoring to be able to shut down the test bench automatically in case of damaged bearings or gears. Test Scheme Overall there are eight test runs with mod-ule 2 mm, and two with module 1 mm gears carried out on the large test bench. Due to the much lower running costs of the small test bench and production costs of small gearsets, higher number of test runs have been carried