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Pressurized Oil System for the DD-70 Compactor
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Sponsor:
Contact Information:
Marlin V. Zeis
IR2 Group Members:
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Executive Summary: Ingersoll-Rand Road Machinery Division has presented the task of implementing an aggressive pressurized oil pumping system into their DD-70 Double Drum Compactor. The insertion of this design is essential to increasing bearing life, decreasing temperature, and reducing the cost of maintenance. Calculations on gear life, bearing life, and fluid mechanics were completed on the system, and schematics of the system were drawn. IR2 has devised a pressurized oil pumping system that will use the existing oil sump in the DD-70 roller to supply the oil to the bearings of the eccentric weight shaft which provides the compacting force. Instead of just using a slotted disk to splash oil onto the bearing, a system of nozzles and pipes will be used to provide a light mist to the bearings. This system will pressurize the oil to 40 pounds per square inch (psi) at 3 gallons per minute (gpm) using a 1 to 4 horse power pump providing oil to two hydraulic spray nozzles that spray the bearings. the present oil operating temperature is 250 ºF. the components in the system must withstand this temperature. The system is powered by a gear set with a gear ratio of 1 that is driven by the eccentric shaft. Since the power transferred by the gears is very low, the gears will last beyond the life of the system. The use of the fine mist will improve the lubrication and lower the friction of the bearings from the 29000 pounds (lbs.) of load applied by the eccentric weight.
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