The S991LYM20B is a heavy-duty L-series gear drive with a 2:1 ratio, designed for low noise and high efficiency. It features spiral bevel gears of case-hardened alloy steel, an aluminum die-cast case, and alloy steel shafts. The unit has a 20 mm shaft diameter, operates at temperatures between -10°C and +40°C, and weighs 3.1 kg. Backlash ranges from 15' to 60', with a flat keyway on the shaft. Dimensions are 80 mm in A, 120 mm in B, and 168 mm in L. It is reversible and maintenance-free.
Speed reducers are components that use a gear train to reduce output rpms. MGX gearheads and speed reducers are made to the highest exacting standards of craftsmanship. Our MGX gearheads are attachable to the U.S. Bureau of Ordnance (Bu-Ord for short) frame-size servomotors without modifications to the input pinions and without complicated adapters, screw threads, etc., thanks to the versatile mounting clamps supplied. Mounting dimensions are identical to Bu-Ord OP 1755 motor dimensions.
Our speed reducers are offered in low and zero backlash options, with single- and double-ended shafts. They are available in Bu-Ord sizes 11, 15, and 18 and with an O.D. of 1-1/16”, 1-7/16”, and 1-3/4”.
Consult engineering for the gearheads and speed reducers:
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| Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|
| Product Category | Gearboxes and Gearheads |
| Product Number | S991LYM20B |
| Product Name | Low Noise & High Efficiency Heavy-Duty 'L' Gear Drive, with a 2 Gear Ratio and a 20mm Shaft Dia. |
| Gear Ratio | 2 (X : 1) |
