General properties and features of RM 80N, RM 125N, RM 160N, RM 250N motors. Design: hydrostatic radial piston motor Purpose: transformation of hydraulic power to drive power. High efficiency, also suitable for very low speeds, low moment of inertia, rapidly reversible, capable of supporting high total loads, four quadrant operation possible, very suitable for applications as a control, extremely quiet operation. Structure and function Drive unit Design: Internal piston support. Method of functioning: Five or ten radial pistons (14.1) load the crankshaft via pentagon ring(s) with needle bearing cages (14.5) Drive details Crank shaft bearing: Pre-loaded, large taper roller bearings (17,18), in X arrangement precise guidance, therefore quiet running, high radial and axial loading capacity (e.g. if a gear wheel is mounted at the shaft end). Force transmission: Piston (14.1) – crankshaft (7) via the pentagon ring (14.2) with needle bearing cage (14.5). Low frictional losses, very long service life, relatively insensitive to dirt, also suitable for extremely high pressure and speed, high starting torque, no stick-slip effect at low speeds, only minor leakage (necessary for the lubrication and cooling of the drive), high efficiency, self-adjusting play to compensate for wear, temperature shock resistant, damping properties of the hydrostatic strain release reduce noise. Design: Planar translational distribution valve with play self-adjustment. Drive unit Design: Planar translational distribution valve with play self-adjustment. Purpose: Distribution of the volume feed to the 5 or 10 cylinders, collection of the return volume flow. Method of functioning: Control rings (6/15) with the external ring (1) and with the eccentric (38) form an external and an internal ring space. By moving the control rings (6/15) between the control plate (4) and the liner (20) by means of the eccentric (38) which is fixed to the crankshaft (5), the internal and the external ring spaces are connected to the cylinders in turn. The ring spaces themselves are connected to the outside through pressure connections on the motor. Control details Roller bearing between the control rings (6/15) and the eccentric (38). The control rings mainly move translationally, however, rotation is possible (2 degrees of freedom) – this means small frictional losses at the control rings (6/15) and a cleaning effect in the sealing gap, approximately equal relative speeds of the sealing faces, sinusoidal opening function for the control openings – this means smooth running even at low speeds and quiet running at high speeds, large volume flow diameters between the rollers (27) in the roller bearing. Adjustment of the play on the control rings (6/15) and the flats on the eccentric: Hydrostatic, low control ring (6/15) force against the flats, pressure supported by spring washers (for zero and low pressure situations), hydrostatic play self-adjustment on the eccentric flats by means of a thrust piece (26) supported by a helical spring. Very low leakage and small frictional losses, automatic compensation for pressure and temperature influences (temperature shocks among others), relatively insensitive to dirt. Miniature shuttle valve (35,36): The effect is that in the ring space between the control rings (6,15), the higher pressure connected to the motor is always effective. Reliable play self-adjustment even at high reversion frequencies. LSHT Hydraulic Motors RM 80N, RM 125N, RM 160N, RM 250N Introduction 26 www.jbj.co.uk/hydraulic-motors.html #DriveLineHarmony
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