Bonfiglioli - Houston Bearing and Supply

NOTE:The selection criteria and specifications reported in this catalogue are not valid for everyand each application, including those where the gearbox operates as a safety device preventinginjury to persons or damage to objects, as is the case with hoisting equipment.For these applications, the gearbox should be selected according to specific criteria and incompliance with the applicable safety regulations. Should this be the case we recommendthat you seek advice from BONFIGLIOLI Technical Service.Selecting a gearmotorConsider the specific application and establish on beforehand:a) service factor « S.F. » according to type of duty, number of starts per hour and expected lifetime(tab. A3.);b) Required motor power :P[HP] r1Tr2inlbsn 2[rpm]63025 (9)Table (A2) lists the indicative values of efficiency « » for the various types of gear units.c) After required power « P r1 » and output speed « n 2 » are known, locate the gearmotor ratingcharts and select the one relevant to normalized power « P n » equal to or greater than « P r1 »:P n P r1(10)Unless otherwise specified, power « P n » listed in the motor rating chart refers to continuous duty.For the output speed « n 2 », or closest to, select the gearmotor that yields a safety factor « S »meeting the following condition:S S.F. (11)Selecting a gearboxExamine the application and establish:a) service factor « S.F. » according to type of duty, number of starts per hour and expected lifetime(tab. A3);b) Determine calculated torque according to required output torque « M r2 » as follows:T c2 T r2 S.F. (12)c) Determine gear ratio from required output speed « n 2 » and drive speed « n 1 »:n1i (13)n213