General properties and features of KM11, RM11 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: Seven radial pistons (14.1) load the crankshaft via a heptagon ring with a needle bearing cage. Drive details Seven radial pistons (14.1) load the crankshaft via a heptagon ring with a needle bearing cage. Crankshaft bearing: cylinder roller bearing (17,18) partially balanced crankshaft. Transmission of force between the pistons (14.1) and the crankshaft (7): 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 RM 11 Design: Planar translational distribution valve with play adjustment. Purpose: Distribution of the volume feed to the 7 cylinders, collection of the return volume flow. Method of functioning: Control rings (6/15) with the external ring (10) and with the eccentric (38) form an external and an internal ring space. By moving the control rings (6/15) between the motor housing (4) and the end cover (8) by means of the eccentric (38) 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 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, spring-supported pressure by means of spring washers (for zero pressure and low pressure situations), hydrostatic re-adjustment of the eccentric flats by means of a pressure 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. Control KM 11 The control corresponds to series KM 22 to KM 110. LSHT Hydraulic Motors KM11 - RM250N Radial Piston Motors www.jbj.co.uk/hydraulic-motors.html #DriveLineHarmony 3
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