Hydraulic motor
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Chamberlain Industries Ltd has added a two-speed model, the 2580, to its range of hydraulic motors. Based on the B80 lOw-speed, highl-torque model, the two-speed version has a variable-eccentric crankshaft and an hydraulic slip-ring located between the valve and motor case. The capacity of the unit can be changed under load between two predetermined displacements, on the application of an external signal.
With the exception of free-wheeling, no restriction is placed on the use of the capacity-change mechanism, also the motor can act as a constant-horsepower device whereby, for example, a 50 per cent change in displacement at constant hydraulic horsepower will double the motor speed and reduce the torque by 50 per cent.
When operating at .zero displacement, the shaft of the 2580 motor can be rotated without pumping hydraulic fluid, ' thus providing a free-wheeling facility for winch, hoist or similar drive applications. This eliminates the need for a mechanical free-wheel clutch.
The company states that, allowing for slight increases in the overall diameter and length, the 2580 motor is interchangeable with the 580 or B100 motors. A standard model with a BSS involute splined shaft is available with maximum displacements of 90 cu in., 70 cu in. or 50 cu in. and minimum displacements of zero (freewheeling), 25 cu in. or 45 cu in. Made by: Chamberlain Industries Ltd, Staffa Works, Argall Avenue, London, E10.