Fan drives, pavers/crushers targets for Sauer-Danfoss Motor

Diesel Progress North American Edition, May, 2009

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Sauer-Danfoss' new D Series cast-iron gear motor provides 4003 psi in a ductile, three-piece housing, complete with an electrohydraulic (EH) proportional relief valve. Targeted for applications such as heavy-duty fan drives and powering work functions in uses such as mining conveyors, road pavers and crushers to flail and side-angle mowers, it is designed as a complement for the Sauer-Danfoss D Series cast-iron gear pump.

"Many off-road applications are known for extreme performance requirements --like the ability to consistently perform under varying high load conditions and withstand dust, dirt and high temperatures. Enter Tier 4 and Stage 3b engine emissions requirements," said Jeff Brenner, product portfolio manager, at Sauer-Danfoss, "and you have engines running at even higher temperatures, with a greater need for cooling."

The D Series motor is seen as especially applicable for variable speed diesel engine fan drive systems. In addition to handling a high cooling demand, an EH proportional relief valve maximizes available machine horsepower by providing cooling only as needed, Brenner said.

An electronic interface makes the D Series motor fully PLUS 1 compliant to integrate with Sauer-Danfoss' PLUS 1 microcontrollers and other compliant products including sensors and graphical displays.

Brenner said the D Series motors are ideal for applications requiring high pressure, 4000 psi vs. 3000 psi, high temperatures and duty cycles. Fan speeds can be controlled to maintain optimum engine and hydraulic system temperatures. Fan reversing capability enables a radiator cleaning cycle. When used in conveyors, the D Series motors offer improved starting torque to control the conveyor speed while optimizing feed rates and maintaining speed under varying load conditions, Brenner said.

The use of the EH proportional relief valve makes fan drives up to 50% more efficient, Brenner said. In the event of a valve failure, the fan speed defaults to the highest setting to maintain cooling integrity. The D Series motors also incorporate high-temperature seals and a dust-resistant shaft seal that improve performance under extreme temperature and pressure conditions and extend operating life, he said. The motors use bronze sleeve bushings in the front flange that are lined with Teflon PTFE, and provide increased radial load capability before requiring the use of outrigger bearings.

The D Series compact design is reportedly 20% smaller than a conventional motor, said Eric Slocombe, product development engineer at SauerDanfoss. A shorter length and consequent higher power density help to ease installation in tighter places. Further, the side or rear port options come in a variety of styles for greater machine design flexibility.

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