A shaft mount reducer is a helical gear reducer whose hollow output mounts directly on the driven shaft, with a torque arm holding the housing against rotation, so no foundation, base or output coupling is needed. The category is the Browning TorqTaper Plus line, built around AGMA class 12 gearing on tapered roller bearings with a triple seal system, and mounted on a single tapered bushing. The standard SMTP unit mounts through a taper bushing kit; the SMFP has a finished bore; the CMTP carries a C-face quill input for a motor; the HMTP carries a hydraulic adapter input; and the SMTPB is the type listed on the 407 through 608 frame sizes. A complete drive is the reducer plus its bushing, torque arm and motor base, each ordered by the reducer case size.
Also known as: shaft mounted reducers, shaft mount speed reducers, torqtaper reducers, shaft mounted gearboxes, torque arm reducers
Series in this category
Related guides: TorqTaper shaft mount reducers, Cross-reference help
| Specification | What it means |
|---|---|
| Ratio | Nominal input to output speed reduction. Stocked ratios are 5:1, 9:1, 15:1, 25:1 and 35:1, with a 148:1 double reduction listed on two units. |
| Reducer size | The frame size, from 107 through 115, 203, 207, 215, 307, 315, 407, 415 and 608. It sets the output bore range, the torque capacity and which accessory kits fit. |
| Product type | SMTP taper bushed, SMFP finished bore, CMTP C-face input, HMTP hydraulic input or SMTPB bushed large frame. |
| Maximum output bore | The largest driven shaft the hollow output accepts, from 1.4375 inch up to 6.5 inch across the sizes. |
| Input style | Shaft, C-face quill, hydraulic adapter, finished or tapered, which is how the motor connects to the reducer. |
| Output speed | The shaft speed at the listed 1750 rpm input, from 350 rpm at 5:1 down to 50 rpm at 35:1. |
| Gear type | Helical gearing throughout the line, built to AGMA standards. |
They are the five TorqTaper Plus types. SMTP is the standard reducer that mounts through a taper bushing; SMFP is Finished Bore Plus, bored to one shaft size; CMTP is the C-Face TorqTaper Plus with a quill input for a C-face motor; HMTP is the Hydraulic TorqTaper Plus with an SAE hydraulic motor adapter; and SMTPB is the TorqTaper Plus type listed on the 407 through 608 frame sizes.
Five: 5:1, 9:1, 15:1, 25:1 and 35:1, all listed at a 1750 rpm input. Those give output speeds of 350, 194, 117, 70 and 50 rpm respectively. A 148:1 double-reduction unit is listed on two sizes for very low output speeds.
No. The SMTP and SMTPB are listed without a bushing so that one reducer size can be fitted to any shaft within its bore range. The TorqTaper Plus bushing kit is a separate listing under speed reducer accessories and is ordered in the shaft size. The SMFP type is the alternative if a finished bore is wanted instead.
On motor horsepower against the output speed the machine needs, adjusted for how hard the service is. A Class I selection reads the chart directly; a Class II selection multiplies the motor horsepower by 1.4 first; a Class III selection multiplies it by 2.0 and rounds up to the next listed horsepower. A 3 horsepower motor at Class II is selected as 4.2 factored horsepower, which means reading the chart on the 5 horsepower line.
The shaft diameter, written as three digits. The first is the whole inches and the second and third are the fraction in sixteenths, so 107 is a 1 7/16 inch shaft, 200 is a 2 inch shaft and 308 is a 3 1/2 inch shaft. The bushing number is the case size, the bushing designation and then that code, so the same reducer takes a different bushing for every shaft it might go on.
It is a question about the belt drive between the motor and the reducer, not about the reducer. A low base places the motor closer in and gives shorter belt drive center distances; a high base gives longer ones. Choose whichever suits the sheave sizes and the belt length the drive needs, and order it against the reducer case size like every other kit.
Most are not. Four of the 107 listings carry a price and the rest are quoted on request. The bushing kit and any accessory kits are separate listings, so a request should name the reducer, the shaft size for the bushing and the kits the drive needs, so that the whole drive is quoted together.
