Concentric AB-CALMA SERIES-EU-2011-7 2 Gear Flank Contact Line Gear Flank Contact Line Standard Gear Pump Single Flank Engagement CALMA Series Double Flank Engagement Outlet Pressure Pulsation reduced by 75%vs. Standard Gear Pump Concentric is a specialist in hydraulic gear product technology. The company has a long standing tradition of developing gear products that meet the unique needs of specifi c markets and applications. In the electric vehicle markets low noise operation across a wide speed range is a key requirement. This capability enables operator comfort and improved control and positioning for various vehicle functions. Concentric established itself as a leader in low noise gear products a decade ago when it introduced its WQ series (quiet) gear pump product line featuring dual flank engagement of the gear teeth to reduce the amplitude of the pressure pulsations introduced into the hydraulic system. The size of the pressure pulsation from the pump determines the pump noise levels. Now Concentric is introducing the Calma Series which sets the new standard for low noise operation. Available in displacements from 6.2cc – 23.7cc the Calma pump’s pressure pulsation is minimized to 25%. Calma’s efficiency, wide speed range and low noise performance are the result of extensive research and development. Calma is especially well suited to applications on electric counterbalanced lift trucks, warehouse lift trucks, electric aerial work platforms and other mobile equipment where low noise, low speed and high efficiency are required. THE POWER OF CALMA Low noise across a wide speed range Pictures on above are used with the kind permission of eg: Atlet, BT, Huddig, Scania, Toro and Volvo Construction Equipment. The right to modifi cations for technical improvements is reserved. Calma Pump Features: • 97% Typical Volumetric Efficiency. • Wide Speed Range. • Substantial Noise Reduction. • Pressure Pulsation Reduced by 75%. • A newly engineered tooth geometry. • An innovative approach to gear flank engagement. • Reduced trapped oil volume. • Compares favourably with more expensive internal gear pumps on efficiency and low noise operation. Calma Series vs. Traditional Gear Pump
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