MRT Series Motor
MRT Series: LSHT Large Displacement Radial Piston Motors, MRT, MRTE, MRTF: 7,100cc/rev – 23,033cc/rev; Fixed Displacement.
FUNCTIONAL DESCRIPTION
The outstanding performance, which is already known in the MR – MRE series motors, is the result of an original and patented design. The principle is to transmit the effort from the stator to the rotating shaft by means of a pressurized column of oil instead of the more common connecting rods, pistons, pads, and pins. This oil column is contained by a telescopic cylinder with a mechanical connection at the lips at each end which seals against the spherical surfaces of the cylinder heads and the spherical surface of the rotating shaft. These lips retain their circular cross section when stressed by the pressure so there is no alteration in the sealing geometry. The particular selection of materials and optimization of design has minimized both the friction and the leakage. Another advantage of this design stems from the elimination of any connecting rods, the cylinder can only expand and retract linearly so there are no transverse components of the thrust. This means no oval wear on the moving parts and no side forces on the cylinder joints. A consequence of this novel design as a 10 piston motor is the significant reduction in dimensions. Especially the diameter is limited to a value of motors with half of its capacity. Performances reached by this motor type are improved with reference to other motors of the same displacement. Another advantage stems from the geometrical arrangement of the 10 – 14 pistons, that results in a static balance of the motor shaft and in a great reduction of the reaction forces on the bearings with a consequent large extension of their lifetime.
TIMING SYSTEM
The timing system is realized by means of a rotary valve driven by the rotary valve driving shaft that it is connected to the rotating shaft. The rotary valve rotates between the rotary valve plate and the reaction ring which are fixed with the motor’s housing. This timing system is also of a patented design being pressure balanced and self-compensating for thermal expansion. The motor sizes from MRTE 16500 to MRTE 23000 are available with large timing system option that allows higher motor power performances as well as the possibility to have a through the hollow shaft.
EFFICIENCY
The advantages of this type of valve coupled with a revolutionary cylinder arrangement produce a motor with extremely high values of mechanical and volumetric efficiency. The torque output is smooth even at very low speed and the motor gives a high performance starting under load.
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Specifications
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General Characteristics MRT-MRTE-MRTF
Construction Fixed displacment radial piston motor Type MRT, MRTE, MRTF Mounting Front flange mounting Connection Connection flange Mounting positions Any (note the installation notes on page 22) Direction of rotation Clockwise, anti-clockwise - reversible Fluid HLP mineral oils to DIN 51 524 part 2; Fluid type HFB, HFC and Bio-fluids on enquiry. FPM seals are required with phosphorous acid-Ester (HFD) Fluid temperature range t °C – 30° a + 80° Viscosity range 1) ν mm 2 /s 18 to 1000: Recommended operating range 30 to 50 mm 2 /s (see fliud selection on page 6) Fluid cleanliness Maximum permissible degree of contamination of fluid NAS 1638 Class 9. We therefore recommend a filter with a minimum retention rate of ß 10 > 75. To ensure a long life we recommend class 8 to NAS 1638. This can be achieved with a filter, with a minimum retention rate of ß 5 >100 1) For different valves of viscosity please contact GS Global Resources - - Options
Can be equipped with optional built-on manifold blocks (cross relief-, anti-cavitation, internal flushing and internal drain valves) and customizations to suite customer needs - Features and Benefits
The double eccentric design of Calzoni MRT motors is such to have the radial forces generated during operations on each cam balancing each other: close to zero reaction on bearings. This characteristic, unique of MRT Calzoni design, guarantees an extremely long lifetime in service, high reliability with consequent very substantial reduction of downtime costs in demanding applications - High volumetirc efficiency (up to 98%) - High mechanical efficiency - High starting torque - Wide operating temperature range - Smooth rotation even at low speeds - Reversible operation (motor and pump) - ATEX version available for usage in potentially explosive atmospheres (Divective 94/9/EC) - Markets
Industrial - Marine - Applications
Injection Molding Machines - Winches - Slewing Drives - Stone Crushers - Conveyors - Material Handling - Mining Industry - Industrial Applications - Marine Applications - -
Resources
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