From Sumitomo Machinery Corp. of America
In the power transmission industry, shaft mounted speed reducers provide one possible solution to meet the speed reduction/power generation needs for an application. As the name implies, a Shaft Mounted Speed Reducer (also known more simply as SMSR) is a speed reducer mounted directly onto, and statically supported by, a driven shaft - that may be found on a conveyor. Typically, the SMSR incorporates a hollow bore (keyed, Taper-Grip® bushing, etc.) to facilitate mounting onto the driven shaft.
The SMSR may be "fixed" to the machine using an output flange or, in certain instances, its housing may be bolted directly onto the machine. However, situations exist where direct attachment of the SMSR is either not possible, or not desirable. In such situations, the SMSR is supported only by the shaft that it is intended to drive.
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