The CRM serie geared engine reducers are characterized by the position of both coaxial input and output shafts and are made up of two or three helical gearsets. Their main particularity, is their great compactness and silence when working.
The quality of the materials used together with the certified ISO-9001 standard quality assurances system, lend this series a high degree of reliability that ensures its integration and adaptation to the medium.
Housing
Made from durable GG20 grey cast iron, the gear reducer body and covers are designed with large dimensions and a reinforced ribbed texture, providing reliable resistance to intense stresses and vibrations.
Gears
The gear components are constructed using casehardened alloy steel, adhering to IHA specifications F154 and F156 for the pinions, achieving core breaking strains of 120 and 130 Kg/mm². Gear wheels utilize F155 and F158 steel with core strains of 95 and 110 Kg/mm², respectively. Both pinions and wheels reach a hardness of 60-62 HRC, with all flanks ground using high-precision technology.
For bevel gear or perpendicular shaft assemblies, the spiral bevel gears are of Gleason design. The pinion, formed from F156 steel, offers a breaking strain of 130 Kg/mm², while the wheel, built from F158 steel, withstands up to 110 Kg/mm². Each undergoes case hardening, quenching, and lapping treatments to maintain stable operation with reduced vibration.
Careful resistance and longevity calculations ensure the gears can operate effectively within safe stress levels for the selected materials.
Supports and output shafts
Constructed from IHA F155 alloy, each shaft in this design achieves a core breaking strain of 95 Kg/mm².
The input shaft features a single-piece configuration that combines the gear pinion and shaft, fabricated from either F153 or F156 material for added strength. High-precision bearings of premium quality and sufficient size support each shaft, with ground seatings meeting strict tolerance requirements.
The hollow output shaft is compatible with custom one-piece shafts in various shapes and lengths as needed. Additional single and double output shaft configurations are available if specified.
Sealing
Watertight sealing in the unit is achieved with acrylonitrile-butadiene rubber ring seals. When high-temperature resistance is necessary, synthetic fluorine rubber (VITON) seals are used instead.
Lubrication
For sizes 27 through 67, reducers come filled with polyolefin-based synthetic oil that meets ISO VG 320 standards, ensuring complete oil tightness and suitability for any mounting position. Starting with size 77, reducers are supplied without oil, leaving the user responsible for filling. The user must also specify the installation position to define the placement of filling, level, and drain plugs.
Each unit includes a manual with instructions for maintenance and lubrication.
Power and Efficiency
The power ratings shown in the selection table are applicable to uniform workload scenarios, with up to 10 hours of continuous operation and no shocks or excess loads.
For different operating conditions, consult the appropriate work factor tables in this catalog to ensure accurate selection.
Each gear reducer’s efficiency is determined by the number of reduction stages. In the CRM gear reducer series, the efficiency per reduction stage is between 98.5% and 99%.
