Gearing
Speed reducers and gear drives for industrial power transmission. Browning and Morse right-angle worm reducers and shaft-mounted drives cover the common ratios, center distances, and mounting arrangements.
The gearing group covers the reducers that slow a motor to a working speed and the open gears that build a drive on a machine. Right angle gearing is the largest part of it: Morse worm speed reducers listed by center distance, ratio, input style and output shaft, with a C-face quill input for a motor or a solid shaft input. Shaft mount reducers are the Browning TorqTaper Plus line, hung on the driven shaft and held by a torque arm. Open gearing is Browning spur, bevel, miter and spiral gears and gear rack in 14.5 and 20 degree pressure angles. Gearhead parts and kits and speed reducer accessories carry the bushings, gear kits, backstops, guards and mounts that go with them.
Also known as: gear reducers, speed reducers, worm gear reducers, gearboxes, open gears
Series in this category
Related guides: TorqTaper shaft mount reducers, Cross-reference help
| Specification | What it means |
|---|---|
| Ratio | Input to output speed reduction. With the listed 1750 rpm input it fixes the output speed of the reducer. |
| Center distance | The distance between the worm and gear axes on a worm reducer, from 1.33 to 3.75 inch. It is the frame size and sets the mounting footprint. |
| Input style | C-face quill, solid shaft, hydraulic adapter, modular or gearmotor, which is how the motor drives the reducer. |
| Output shaft | Solid shaft or hollow bore, which is how the reducer drives the load. |
| HP range and output torque range | The input horsepower band and the output torque band at 1750 rpm input, used to check a reducer against the driven load. |
| Diametral pitch | The tooth size of an open gear, listed from 3 to 20 across the range. Mating gears must share it. |
| Pressure angle | The tooth form of an open gear, 14.5 or 20 degrees. Mating gears must share it. |
| Gear type | Worm on the right angle reducers, helical on the shaft mount reducers, and spur, bevel, miter or spiral on open gearing. |
The distance between the axis of the worm and the axis of the gear it drives, listed in inches from 1.33 to 3.75 on the stocked Morse reducers. It is the frame size of the unit and sets the housing dimensions and mounting pattern, so a replacement reducer is chosen on center distance first and ratio second.
An input built to take a C-face motor bolted straight onto the reducer, so no separate input shaft, coupling or motor base is needed. It is the most common input style on the worm reducers listed here, with solid shaft inputs for drives where the motor is mounted separately.
A hollow bore output puts the reducer directly on the driven shaft, so no output coupling or base is needed. A solid shaft output drives the load through a coupling, sprocket or sheave and mounts the reducer on a base. Both are listed on the worm reducers; the shaft mount reducers are hollow bore by design.
No. Every open gear here is listed with its pressure angle, 14.5 or 20 degrees, and its diametral pitch, and a mating pair is chosen so both match. The tooth count and pitch diameter then set the ratio, and the face width and bore are matched to the shaft and the load.
A torque arm. Because the housing hangs on the driven shaft with nothing under it, the reaction to the output torque would otherwise swing the whole reducer round, so a torque arm is required on every shaft mount installation and is ordered by case size alongside the reducer. A backstop is added separately where the load must not be able to run backwards.
A bushing in the driven shaft size, a torque arm, and usually a motor mount base carrying the motor that belt-drives the reducer. The base comes in a high and a low height, which sets whether the belt drive runs on longer or shorter center distances. A belt guard, a fan kit on the larger sizes and a bushing for the driven sheave complete the order, all keyed to the same case size.
