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WORM GEAR REDUCERInch DimensionMetric DimensionAluminum Series
| CYCLOIDAL REDUCER | HELICAL GEAR REDUCER | COMBINATION OF REDUCER AND VARIATORS | SPECIAL REDUCER |
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Stepless Variable MACHINERY& Reducer
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WORM GEAR REDUCERInch DimensionMetric DimensionAluminum Series
| CYCLOIDAL REDUCER | HELICAL GEAR REDUCER | COMBINATION OF REDUCER AND VARIATORS | SPECIAL REDUCER |
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Products:
Helical shaft mount gearboxes
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hollow shafts
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introduce
Speed reducers, also called a gearboxes and gearheads, as well as gear reducers
etc., consist of a set of gears, shafts and bearings that are factory mounted in
an enclosed lubricated housing. Speed reducers are available in a broad range of
sizes, capacities and speed ratios. Their job is to convert the input provided
by a prime mover (usually an electric motor) into an output of lower RPM and
correspondingly higher torque.
Important performance specifications to consider when searching for gearboxes
and gearheads include gear ratio, output torque, maximum input , and
maximum input speed. Ratios are generally specified at X: 1, where X is an
integer. Therefore a ratio of 5:1 is specified as 5. A 5:1 ratio means that a
motor input of 1750 RPM is converted to 350 RPM. A reducer's input HP rating
represents the maximum prime mover size the reducer is designed to handle.
Exceeding the maximum input speed can result in oil "churning", which is
detrimental to the life of the speed reducer.
Gearing arrangements for gearboxes and gearheads include spur, helical,
planetary, harmonic, worm, bevel, and cycloidal. Spur gears are gears with teeth
that are straight and parallel to the axis of rotation. They are good for
parallel shafts. Helical gears are gears with teeth that spiral around the gear.
They are similar to spur gears but with greater time of contact and quieter.
Planetary gears get their name from a 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 train instead of a gear
set. Harmonic gears utilize 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. A worm gear is a
threaded input shaft meshed with a worm gear that is mounted to the output
shaft. These are usually used for right angles. Bevel gears are gears that
shafts 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. 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.
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.
Input and output configurations for gearboxes and gearheads include hollow
shaft, hollow shaft, or coupling or bushing. A single input shaft can drive
multiple output shafts. The output shafts are usually parallel and in-line.
How, some unique configurations exist that allow for offset shafts to be
driven at different speeds. Some gearboxes and gearheads can be supplied with a
reaction arm. A reaction arm prevents the reducer housing from rotating when
there is no base mounts or flanges. Shaft alignment can be parallel in-line,
parallel offset, right angle, and non-perpendicular angled shafts. Shafts can be
aligned vertically as well. In order for a shaft to be orientated in a vertical
position, considerations need to be made regarding lubrication.