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Gear Ratio:

(X : 1)

Output Torque:

Maximum Input Power:

Gearing Arrangement:

Maximum Input Speed:

Backlash:

Reducer Style:

Flange(s)?

NEMA Mount?

Reducer Input:

Reducer Output:

Multiple Outputs?

Reaction-Arm?

Shaft Alignment:

Vertical Shaft(s)?

Help with Gearboxes and Gearheads specifications:

Ratio
   Gear Ratio       Ratios are generally specified at X: 1, where X is an integer. To ease the burden on our search engine, this ratio is entered as X/1, or X. Therefore a ratio of 5:1 is entered as 5. A 5:1 ratio means that a motor input of 1750 RPM is converted to 350 RPM. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Torque
   Output Torque:       Torque is a measure of angular force that produces rotational motion. Torque is the real consideration for output specification. Horsepower output has little application relevance. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Power
   Maximum Input Power:       A reducer's input HP rating represents the maximum prime mover size the reducer is designed to handle. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Gearing
   Gearing Arrangement       
   Your choices are...         
   Spur
NEMA cutaway (a)Courtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     Spurs are gears with teeth that are straight and parallel to the axis of rotation. These gears are good for parallel shafts. 
   Helical       Helical gears have teeth that spiral around the gear. They are similar to spur gears, but with greater time of contact and they are quieter. 
   Planetary
Helical Planetary Design - gearheadCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     Planetary configuration gets its name from its resemblance to a solar system.  Planetary reducers can be designed with gear sets, or a set of planetary cones.  In planetary gear reducers, planet gears revolve around a sun gear. The input shaft rotates the sun gear. Each of the planet gears simultaneously applies a torque to the rotating planet member that then applies a torque to the output shaft (back side).  Planetary cone reducers operate on a similar principle, utilizing an input disc, control ring, and planetary cone power train instead of a gear set. 
   Harmonic       Harmonic gearing utilizes a nested gear within a circular spline, the inside one being flexible and containing two fewer teeth. Each turn of the inside moves the flexible gear anti-clockwise on the circular spline. 
   Worm
ReducerCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     Worm gearing is a threaded input shaft that meshes with a worm gear mounted to the output shaft. These gears are usually used for right angles. 
   Bevel / Miter
NEMA cutaway (b)Courtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     Bevel or miter gears have shafts that lie perpendicular to each other, therefore utilized mainly in right-angle applications.  Miter gears are bevel gears with a 1:1 ratio.  They are not used for speed reduction. 
   Cycloidal       Cycloid reducers use rolling elements (such as a cam follower) and a multilobe cam to transmit torque and provide speed reduction. Cycloidal reducers can provide high reduction ratios with low backlash, high accuracy, and high stiffness. The load-sharing feature of cycloidal reducers also allows it to withstand high shock loads. 
   Hypoid       Hypoid gearing is a right-angle, non-intersecting drive using a drive gear (resembling a worm) offset from the center of the driven gear. 
   Other       Other, unlisted, or proprietary gear arrangement. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Performance Specifications
   Maximum Input Speed:       Exceeding the maximum input speed can result in oil "churning", which is detrimental to the life of the speed reducer. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Backlash       Backlash is the amount of play (or lost motion) between the gear teeth. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Configuration
   Reducer Style      A speed reducer is termed a gearhead if it is entirely and directly mounted onto a motor, not just the shaft. Therefore, other speed reducers (gearboxes) are typically coupled with the shaft and then base-mounted. The coupling of the shaft from the prime mover to the input shaft of the speed reducer can be accomplished in a few different ways. If the two shafts are coupled shaft-to-shaft directly, a coupling is required. If they are not coupled shaft-to-shaft, the speed reducer generally has a "quill-style" or hollow shaft for the prime mover shaft to mount into. The coupling is accomplished with a clamping pinion gear or adapter plate. Specific NEMA face adapters (coupling type) are also manufactured to eliminate sizing concerns between motor and gearbox.
   Your choices are...         
   Integral Base
Gearmotor - base mountCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     Unit is base or foot mounted. Bases may have shaft inputs and outputs or C-face or NEMA motor mounts. The load of the reducer is not supported by the motor.  Also includes gear drives and speed reducers. 
   Motor Mount / Gearhead
Servo GearheadCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     Motor mount, or gearheads, are reducers that are mounted entirely onto the motor and motor shaft. 
   Shaft Mount
Planetary Gear Reducer - self-containedCourtesy of WITTENSTEIN, Inc. (formerly alpha gear drives)
 
     Shaft mount gearboxes do not have an integral base. The weight of these reducers is supported entirely by the driven machine housing or drive shaft. The input shaft of the gearbox does not absorb the reducer weight or torque reaction. Also includes gear drives and speed reducers. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Flange(s)
Planetary Gear Reducer - high torqueCourtesy of WITTENSTEIN, Inc. (formerly alpha gear drives)
 
     Unit utilizes a flange, or flanges, for input and/or output. Flanges can be round or square.  Flange may be for mounting a motor or mounting to a machine surface. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   NEMA Mount
NEMA enclosed GearheadsCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     Specific NEMA face adapters (coupling type) are used to eliminate sizing concerns between motor and gearbox. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Reducer Input       
   Your choices are...         
   Hollow Shaft
Hollow Shaft Right Angle MultidriveCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     "Quill-style" or hollow shafts are used for the prime mover shaft to mount in. 
   Solid Shaft
Gearmotor - nonmotorizedCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     Solid shafts require coupling. 
   Coupling or Bushing       Driven shaft fits into integral coupling or bushing. 
   Other       Other, unlisted, or proprietary input type. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Reducer Output:      Reducers having hollow output shafts are usually shaft mounted to the driven load, with the shaft of the driven load being inserted into the hollow shaft. If no output flange or secondary base is used, a reaction arm prevents the reducer housing from rotating when there is no base mounts or flanges
   Your choices are...         
   Hollow Shaft
Hollow Shaft Right Angle MultidriveCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     "Quill-style" or hollow shaft 
   Solid Shaft
Gearmotor - nonmotorizedCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     Requires coupling. 
   Coupling or Bushing       Driving shaft fits into integral coupling or bushing. 
   Other
Output Shaft with involute and ISO FlangeCourtesy of WITTENSTEIN, Inc. (formerly alpha gear drives)
 
     Other, unlisted, or proprietary output type. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Multiple Outputs
Dual Shaft Right Angle MultidriveCourtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical
 
     A single input shaft can drive multiple output shafts. The output shafts are usually parallel and in-line. However, some unique configurations exist that allow for offset shafts to be driven at different speeds. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Reaction-Arm       A reaction arm prevents the reducer housing from rotating when there is no base mounts or flanges. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Shaft Alignment       
   Your choices are...         
   Parallel In-line
Planetary Gear Reducer - self-containedCourtesy of WITTENSTEIN, Inc. (formerly alpha gear drives)
 
     In parallel in-line alignments, the input (driving) shaft and the output (driven) shaft can be connected with an imaginary axial line through the center of each shaft at 0° angle. 
   Parallel Offset
spur offset-shaft gearheadCourtesy of Portescap
 
     In parallel offset alignments, the input (driving) shaft and the output (driven) shaft are parallel. However, they reside in the gearbox at different heights above the horizon. 
   Right Angle
Fractional & Integral HP Gear ReducersCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     In right angle alignments, the input (driving) shaft and the output (driven) shaft are perpendicular to one another. This is most common with worm gear speed reducers. 
   Non-perpendicular Angled Shafts       Non-perpendicular angled shafts are uncommon. In this alignment, the input (driving) shaft and the output (driven) shaft are not perpendicular to one another, but they are angled. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Vertical Shaft(s)
Vertical Output Shaft Low BaseCourtesy of LEESON Electric - A REGAL-BELOIT Company
 
     In order for a shaft to be orientated in a vertical position, considerations need to be made regarding lubrication. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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