Greedy for grime
2nd Quarter 2012
Hydraulic systems & components
An initial sweeper prototype based on an in-house design did not live up to expectations at sweeper company, Brodd Sweden. A trip to the Sauer-Danfoss test track in Nordborg, Denmark, and a hydraulic makeover later, and the compact, self-propelled Yess sweeper is the market’s new high performing dust-buster. Now city grime is no match for the new Yess sweeper.
“We invited Brodd to bring their machine to our facility, where we talked about what was important to them and measured the existing hydraulic system. Then we replaced the hydraulic parts with Sauer-Danfoss components and measured again. There was a big difference,” recalls David Stålgren, sales development manager at Sauer-Danfoss. Smooth, fuel efficient Sweep Two OMP 125 orbital motors have improved the efficiency, driving smoothness and control of the low-speed sweeper. For noiseless steering, an OSPC 80 ON steering unit with 17 cc gear pump has been introduced.
“This is very important as the steering unit is inside the cabin,” Stålgren comments. Managing the sweeper’s work functions are a Turolla OCG compact triple gear pump – comprising 33 ccm, 7 ccm and 8 ccm displacements – and a five section PVG 32 valve with integrated PVBZ low leakage module to keep the brushes at an optimum height when not in use. Four of the sections are PVEO-R on-off valves with a delayed reaction time, an economical choice that secures a smooth start-stop action and reduced mechanical wear. AMP connectors on the PVE electrical actuators provide high water protection.
A Comatrol HIC block is responsible for controlling the two brushes in relation to the ground, ensuring a constant pressure even on uneven territory. As the brushes rotate, a 14 ccm Turolla OCG SNM2 gear motor, with integrated anti-cavitation check valve and relief valve, sucks up dust and debris. This neat solution adds to the overall system compactness and fuel efficiency.
On returning to the Sauer-Danfoss test track to see the Yess prototype in action with the new hydraulic system, Brodd CEO Per-Olav Brodd was delighted. “We have decided to go over to Sauer-Danfoss entirely,” he states.
For more information contact Nadiem Fredericks, Sauer-Danfoss Hydraulics, +27 (0)11 785 7600, [email protected], www.sauer-danfoss.com
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