Shaft Mounted Gearboxes (SMSR)
Source shaft mounted gearboxes (SMSR) from India's verified manufacturers and exporters on Himalay. Browse horizontal SMSR, vertical SMSR and tie-rod SMSR for industrial and export applications.
Browse Shaft Mounted Gearboxes (SMSR) by Type
About Shaft Mounted Gearboxes (SMSR)
Shaft-mounted speed reducers (SMSR) are parallel-shaft helical gear units that slide directly onto the driven shaft and are restrained against rotation by a torque arm rather than bolted to a separate foundation. This mounting approach eliminates the base frame, coupling and alignment work of a foot-mounted drive, which is why SMSRs dominate bulk-material conveyor heads, screw conveyors, mixers and similar continuous-duty machinery. Torque reaches the output hollow bore through two or three helical reduction stages, and the unit's own weight is carried by the shaft it drives.
Most SMSR ranges offer nominal ratios from roughly 5:1 to 25:1 in two stages, extending to about 40:1 in three-stage builds, with output speeds commonly in the 15-400 rpm band and torque ratings that climb into the tens of thousands of Nm on larger frames. Mechanical efficiency typically sits near 96-98% per gear pass. Gears are generally rated to AGMA 2001/ISO 6336 and cut to ISO 1328 / AGMA 2015 quality grades, with enclosed-drive rating practice following AGMA 6013. Frame sizes are usually catalogued against an AGMA service factor so the buyer can match duty.
Gears are normally case-hardened alloy steel (20MnCr5 or 18CrNiMo7-6) with ground or lapped profiles running in cast-iron housings on SKF/FAG-equivalent bearings; lip or labyrinth seals and a backstop (anti-run-back) option suit inclined conveyors. The hollow output bore is keyed or fitted with a shrink (taper-bush) disc for quick mounting, and a torque arm with a damping bush absorbs reaction and shock.
Configuration covers IEC motor adapters or free input shaft, V-belt or direct drive, mounting in horizontal, vertical and tie-rod arrangements, and mineral or synthetic PAO ISO VG 220/320 lubrication selected for ambient and orientation. Correct AGMA service-factor selection against shock load and run hours is the central sizing decision.
Himalay's MSME partners manufacture shaft-mounted reducers with gear-rating to AGMA/ISO 6336, ISO 9001 quality systems, load and efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
