KM11-RM250 series radial piston motors

High efficiency, also suitable for very low speeds, lowmoment of inertia, rapidly reversible, capable of supporting high total loads, four-quadrant operation ossible, very suitable for applications as a control, extremely quiet operation. Drive details Purpose: transformation of hydraulic power to drive power. Design: Hydrostatic radial pistonmotor. Structure and function Drive unit Method of functioning: Seven, fourteen or twenty- one radial pistons (14) load the crankshaft (7) via heptagon rings (15) with needle bearing cages (4). General properties and features of KM 22 - KM 110motors Design: Internal piston support Crankshaft 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). Transmission of force between the pistons (14) and the crankshaft (7): via heptagon ring (15) with needle bearing cage (4). 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. Control Purpose: Distribution of the volume feed to the cylinders, collection of the return volume flow. Play self-adjusting seal against leakage to the outside: Low hydrostatic force of the thrust piece (24) against the control disc (6) supported by the spring washer (35). Method of functioning: The control disc (6) has an integrated internal ring space and forms an external ring space in conjunction with ring (10). By moving the control disc (6) between the motor housing (1) and the end cover (8) by means of the eccentric (5) which is fixed to the crankshaft (7), 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 to themotor. Control details Design: Planar translationally moving distributor with clearance seal to prevent internal leakage and with play self-adjusting seal to prevent leakage to the outside. Reduction in the leakage to the outside at only low frictional losses, automatic compensation for pressure or temperature influences, relatively insensitive to dirt. Needle bearing cage (27) between control disc (6) and eccentric (5): The control disc (6) mainly moves translationally, however, rotation is possible (2 degrees of freedom) – this means small frictional losses at the control disc (6) 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. LSHT Hydraulic Motors KM11 - RM250N Radial Piston Motors 4