Gearboxes and Gearheads Specifications

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.
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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.
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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.
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Gearing


	Gearing Arrangement
	Your choices are...
	Spur 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 Courtesy 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 Courtesy 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 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.

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.
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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 Courtesy 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 Courtesy 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 Courtesy 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) Courtesy 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 Courtesy 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 Courtesy 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 Courtesy 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 Courtesy of Bayside Motion / Trilogy Motors - Brands of Parker Hannifin Electromechanical		"Quill-style" or hollow shaft
	Solid Shaft Courtesy of LEESON Electric - A REGAL-BELOIT Company		Requires coupling.
	Coupling or Bushing		Driving shaft fits into integral coupling or bushing.
	Other Courtesy 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 Courtesy 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 Courtesy 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 Courtesy 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 Courtesy 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) Courtesy 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.