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bevel gearbox / helical / orthogonal / hollow-shaft
bevel gearbox
RO 2

Torque: 120 Nm - 550 Nm
Power: 0.3 kW - 12 kW

Main use: bevel helical speed reducers for fractional and medium drives. Range: 4 sizes, all alluminium pressure die cast.

parallel-shaft gearbox / high-rigidity
parallel-shaft gearbox
RB series

Torque: 11 Nm - 108 Nm
Power: 0.04 kW - 0.12 kW

The RB geared motors are used in automatic feeding of heating systems. Three in-line gear sets, aluminium die cast housing in two robust shells and IEC56/B14 integral motor adapter, motor shaft with ...

planetary gear reducer / coaxial / precision / low-backlash
planetary gear reducer
RG series

Torque: 12 Nm - 480 Nm

... Series manufactured by Varvel is a low-backlash planetary reducer that was specifically developed for two and three stages. They have hardened and tempered steel casing and broached internal gear. They ...

helical gear reducer / parallel shaft / for screw conveyors
helical gear reducer
RP90 series

Torque: 4 Nm - 32 Nm
Power: 0.25 kW - 1.5 kW

Varvel presents the RP90 series one-stage helical gearboxes. These are primarily used for linear-feeder driving (screw conveyors) in animal livestock systems. It is available only in one size. The body is made of aluminium pressure ...

worm gear reducer / orthogonal / high-performance / with flange
worm gear reducer
TD series

Torque: 700 Nm - 47000 Nm

High performance worms using a drum-shaped troidal worm provides high transfer capacity and high efficiency. Two mounting styles are available: foot mount and on-shaft flange mount. Ensures ultimate compactness and ...

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Tsubakimoto Chain
worm gear gear reducer / cylindrical / orthogonal / high-performance
worm gear gear reducer
EWJ, EWJM series

Torque: 12 Nm - 300 Nm

Redesigned to achieve further energy savings through improved performance and efficiency, easier to use due to the case integrated with the foot and a center distance in just mm dimensions. Features Employ dedicated cases which ...

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Tsubakimoto Chain
worm gear reducer / orthogonal / high-capacity / with flange
worm gear reducer
SWJ, SWJM series

Torque: 12 Nm - 300 Nm

Remodeled for further energy savings through increased performance and efficiency. Also compatible with flange mount on both sides. Motor type has a wide range of options. Features Employ dedicated cases which can be installed ...

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Tsubakimoto Chain
worm gear gear reducer / cylindrical / orthogonal / high-precision
worm gear gear reducer
EW, EWM series

Torque: 300 Nm - 5300 Nm

Well-balanced in capacity, efficiency and cost while providing high precision and compactness. Foot mounting style is standard. Both solid and hollow output shaft types are available. The solid shaft type is excellent for connections ...

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Tsubakimoto Chain
worm gear reducer / cylindrical / hollow-shaft / high-capacity
worm gear reducer
SW, SWM series

Torque: 300 Nm - 5300 Nm

Uses a dedicated case for on-shaft and flange mounting with the same well-balanced worm as the EW Series, contributing to equipment simplification. In addition to a selection between solid and hollow output shafts, ...

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Tsubakimoto Chain
planetary gear reducer / coaxial / precision / for shafts
planetary gear reducer
GP 4 series

Torque: 0 Nm - 0.01 Nm

Precision spur- and planetary gearheads matched to maxon motors. Gears are advantageously adapted directly to the desired motors in the delivery plant. The motor pinion is the input gearweel for the ...

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maxon motor
planetary gear reducer / coaxial / low-noise / high-power
planetary gear reducer
GPX 8 series

Torque: 0.01 Nm - 0.1 Nm

maxon GPX gearheads combine extremely high power transmission with a very short construction. High torques and speeds, low noise and backlash… the maxon GPX 08 has virtually every quality that could be required of a ...

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maxon motor
planetary gear reducer / coaxial / high-power / modular
planetary gear reducer
GPX 12 series

Torque: 0.08 Nm - 0.17 Nm

maxon GPX gearheads combine extremely high power transmission with a very short construction. The modular design provides the basis for a customer-specific solution. The use of metal components makes a wide range of ...

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maxon motor
planetary gear reducer / coaxial / high-power / modular
planetary gear reducer
GPX 12 C series

Torque: 0.11 Nm - 0.23 Nm

maxon GPX gearheads combine extremely high power transmission with a very short construction. The modular design provides the basis for a customer-specific solution. The gearhead's ceramic components make it suitable ...

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maxon motor
planetary gear reducer / coaxial / high-power / modular
planetary gear reducer
GPX 12 LN series

Torque: 0.06 Nm - 0.11 Nm

maxon GPX gearheads combine extremely high power transmission with a very short construction. The modular design provides the basis for a customer-specific solution. Plastic planet gears enable use in ...

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maxon motor
cycloidal gearbox / for industrial applications
cycloidal gearbox
300 series

Bonfiglioli’s 300S planetary gearboxes are specially designed for industrial slewing applications. These innovative gearboxes, based on the acclaimed 300 Series, embody all of Bonfiglioli’s vast experience in industrial ...

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Bonfiglioli
cycloidal gear reducer / coaxial / low-backlash / precision
cycloidal gear reducer
TQF series

Torque: 30 Nm - 800 Nm

TQF feature a higher positioning. This Planetary Gearbox is particularly well suited for high positioning accuracy, dynamic cyclic operations and compact solutions for motion control, automation, and robotic. Highest ...

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Bonfiglioli
planetary gear reducer / coaxial / for wheel and track drives
planetary gear reducer
PGW series

Torque: 1300 Nm - 4000 Nm

Benefit from the experience of the leading manufacturer. Whether you are designing a wheeled agriculture or construction equipment, the PGW series will offer you the right choice for your vehicle. A disengagement device to tow the vehicle ...

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Bonfiglioli
planetary gear reducer / coaxial / compact / for wheel and track drives
planetary gear reducer
PGR series

Torque: 1000 Nm - 7000 Nm

Integrated design will result into the best possible product combination. Extreme compactness, lightweight, efficiency and smooth operation are the key features of the PGR series track drives, powered by integrated axial piston hydraulic motors. Available ...

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Bonfiglioli
planetary gear reducer / right-angle / coaxial / compact
planetary gear reducer
700C series

Torque: 1000 Nm - 625000 Nm

... allows the gearbox to be integrated into the winch drum. The failsafe brake can be integrated inside the gearbox or mounted externally, with common lubrication with the gears. Electric-driven ...

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Bonfiglioli
parallel shaft gear reducer / tandem / heavy-duty / for trucks
parallel shaft gear reducer
Transfer Cases (Truck)

Torque: 5600 Nm - 22000 Nm
Power: 230 kW - 500 kW

Efficiency is standard equipment MAN components unite innovative technology and outstanding quality for a degree of economy that’s worth it – for both you and your customers. Profit from our comprehensive program of first-class front ...

helical gear reducer / parallel-shaft / precision / compact
helical gear reducer
0.25 - 55 kW, max. 13 000 Nm | Poulibloc 2000-3000 series

Torque: 820 Nm - 3000 Nm

Poulibloc are helical geared motors that feature parallel output and are suitable for normal environments. They exemplify dual lipseals on treated ground surface and boast the precision and rigidity of ribbed cast iron ...

helical gear reducer / hollow-shaft / explosion proof / for shafts
helical gear reducer
3:1 - 25:1, 100 - 10 000 Nm | Poulibloc - ATEX zone 21

Torque: 100 Nm - 10000 Nm

These hollow shaft geared motors with taper bush are designed to operate in potentially explosive dust atmospheres (ATEX zone 21 certified). These geared motors use a shaft mounting that is adaptable ...

helical gear reducer / hollow-shaft / explosion proof / for shafts
helical gear reducer
3:1 - 25:1, 100 - 10 000 Nm | Poulibloc - ATEX zone 22

Torque: 100 Nm - 10000 Nm

... ATEX zone 22 is designed specifically for use in environments with potentially explosive dust. The model is a hollow shaft geared motor with a tapered bush system, that may be mounted in various areas. Its ribbed cast ...

orthogonal gear reducer / precision / custom / transmission
orthogonal gear reducer

... manufacturing, assembling and testing of new gearboxes along with overhaul and repair transmissions in service. It undertakes the manufacturing of master gears and curvic couplings along with single ...

bevel gear reducer / helical / parallel shaft / industrial
bevel gear reducer
FLENDER helical gear units

Torque: 3300 Nm - 1400000 Nm

The Bevel Helical Gear Unit is an optimized solutions for the task in the future. This series requires more flexibility, high quality performance and standardization when it comes to the industries of handling materials, ...

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Siemens AG - PD - Mechanical Drives
planetary gear reducer / coaxial / transmission
planetary gear reducer
FLENDER SIP® series

Torque: 10000 Nm - 80000 Nm

The FLENDER SIP planetary gear unit offers a wide variety of high-endurance and reliable gear unit quick fixes in fine accruals with great variety and numerous options. The line brings the manufacturers ...

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Siemens AG - PD - Mechanical Drives
planetary gear reducer / coaxial / transmission
planetary gear reducer
FLENDER PLANUREX® 2 series

Torque: 4700000 Nm
Power: 14500 kW

The Siemens FLENDER planetary gear unit series offers a range of standardized gear unit solutions that offer higher power rating ranges. The unit is offered in 27 sizes and seven models. The PLANUREX ...

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Siemens AG - PD - Mechanical Drives
planetary gear reducer / orthogonal / high-torque / high-power
planetary gear reducer
FLENDER PLANUREX® 3 series

Torque: 1700000 Nm - 5450000 Nm

... planetary gear units that have extremely high power capacity, can be used in a wide range of applications and are setting new benchmarks in terms of quality, flexibility and ease of use. PLANUREX 3 offers a complete, ...

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Siemens AG - PD - Mechanical Drives
helical gear reducer / heavy-duty / vertical / for wastewater treatment
helical gear reducer

Torque: 240000 Nm
Power: 4000 kW

... addition, the FLENDER gear units feature 16 different sizes, power levels of up to 3,600 kW, minimal noise levels, a vertical mounting position, two differing gear levels (a 2-, or 3-level), and many ...

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Siemens AG - PD - Mechanical Drives
planetary gearhead
planetary gearhead

Torque: 0 Nm - 32 Nm

Gearheads FAULHABER developes high performance modular gearheads to complement each of its motor technologies. From high torque planetary technology in a variety materials, to zero backlash spur gears, ...

planetary gear reducer / coaxial / precision / high-torque
planetary gear reducer
1.32 - 20.000 Mint.(mNm), 3.33 - 23 014 :1

Torque: 0 Nm - 32 Nm

Planetary Gearheads Their robust construction make the planetary gearheads, in combination with FAULHABER DC-Micromotors, ideal for high torque, high performance applications. For applications requiring medium to ...

spur pinion gear reducer / coaxial / zero-backlash / for shafts
spur pinion gear reducer
15 - 100 Mcont.(mNm), 3.1 - 983.447 :1

Torque: 0.01 Nm - 0.4 Nm

Spur Gearheads A wide range of high quality spur gearheads are available to compliment FAULHABER DC-Micromotors. The all metal or plastic input-stage geartrain assures extremely quiet running. Features ...

spur pinion gear reducer / orthogonal / zero-backlash / for shafts
spur pinion gear reducer
15 - 100 Mcont.(mNm), 69.2 - 2 050 :1

Torque: 0.01 Nm - 0.4 Nm

... offers a special version of a spur gearhead with zero backlash. The backlash is reduced to a minimum by counter-rotating the two individual gear passes to each other and locking them ...

planetary gear reducer / coaxial / low-backlash / for robotics
planetary gear reducer
alpheno®

Torque: 35 Nm - 3360 Nm
Rotational speed: 6000 rpm

Wittenstein’s Alpheno® is a planetary gearhead unit designed and manufactured to be the "next step in planetary gearhead operating efficiency". This high-quality planetary gearhead unit ...

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WITTENSTEIN AG
planetary gear reducer / coaxial / high-performance / low-backlash
planetary gear reducer
RP+

Torque: 540 Nm - 10000 Nm
Rotational speed: 5000 rpm

New Rp+ is a high-performance planetary gearhead that sets standards with respect to power thickness, modularity and easy installation. Rp+ series inherits all the profits of its WITTENSTEIN alpha gearhead ...

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WITTENSTEIN AG
planetary gear reducer / coaxial / low-backlash / for robotics
planetary gear reducer
SP+ series

Torque: 30 Nm - 4500 Nm
Rotational speed: 6000 rpm

The iconic all-rounder planetary gearheads from Wittenstein is perfect for high positioning precision and dynamic cyclic application (DC ≤ 60%). The basic SP+/SP+HIGH SPEED is capable of reverse and continuous operation ...

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WITTENSTEIN AG
planetary gear reducer / coaxial / low-backlash / high-torque
planetary gear reducer
TP+ series

Torque: 32 Nm - 40000 Nm
Rotational speed: 6000 rpm

The TP+/TP+ HIGH TORQUE is a sleek gearhead that was manufactured by Wittenstein. The TP+/TP+ HIGH TORQUE boasts the most excellent performance among all other gearheads that have output flange. It offers ...

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WITTENSTEIN AG
planetary gear reducer / coaxial / low-backlash / for shafts
planetary gear reducer
LP+, LPB+

Torque: 13 Nm - 500 Nm
Rotational speed: 6000 rpm - 8000 rpm

... robust, the set combines the functions of an output shaft (LP+) and an output flange (LPB+) in a low-cost high-performing gearhead series. The LP+/LPB+ are suited for dynamic belt and economical servo applications, while ...

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WITTENSTEIN AG
planetary gear reducer / hollow-shaft / high-torque / high-torque
planetary gear reducer
S series

Torque: 34000 Nm - 2500000 Nm

Brevini "S Series" gear units are the ideal choice for applications, either fixed industrial or self-propelled machines, in need of high torque and minimum dimensions. In comparison to conventional gear ...

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Brevini Power Transmission
planetary gear reducer / high-torque / precision / industrial
planetary gear reducer

Torque: 51000 Nm
Rotational speed: 1200 rpm - 2000 rpm

... manufacturing large precision gears for any industrial application. Brevini Gear Systems facility is able to manufacture and heat treat large-diameter, high-precision gearing. We have ...

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Brevini Power Transmission
planetary gear reducer / orthogonal / high-performance / industrial
planetary gear reducer
i= 3.28:1

Torque: 1000 Nm - 25000 Nm

... modular design planetary gearboxes for industrial applications. It combines high performance with low cost and compact size, excellent reliability, simple installation and reduced maintenance. Brevinis ...

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Brevini Power Transmission
planetary gear reducer / coaxial / ATEX / transmission
planetary gear reducer
ATEX

... compliant planetary gearboxes suitable for applications in zones where explosive atmospheres may occur, and also zones characterised by the presence of gas mixtures and/or combustible powders (zones 1,2,21,22). Every ...

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Brevini Power Transmission
bevel gear reducer / helical / parallel shaft / transmission
bevel gear reducer
i= 710:1

Torque: 3260 Nm - 805000 Nm

This integrated line of helical and bevel helical gearboxes is made in Germany by the Brevini manufacturing unit PIV Drives. These gear units are produced with state of the art design, material, and ...

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Brevini Power Transmission
bevel gearbox / multi-turn / for valve actuators
bevel gearbox
IB range

Torque: 0 Nm - 10846 Nm

Complete range of heavy duty cast iron multi-turn bevel gearboxes suited for the most demanding motorised applications for cast and fabricated sluice gates, gate valves and globe and pinch valves.

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Rotork plc
bevel gearbox
bevel gearbox
HOB/MPR range

Torque: 0 Nm - 8018 Nm

Cost effectively designed commodity hand operated bevel gears suited for sluice gates, gate, and globe valves.

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Rotork plc
spur gearbox / manual / multi-turn / for valve actuators
spur gearbox
IS range

Torque: 0 Nm - 46100 Nm

Complete range of heavy duty cast iron multi-turn spur gearboxes suited for the most demanding manual and motorised applications where the gearbox input shaft needs to be parallel with the valve stem ...

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Rotork plc
gears gearbox / stainless steel
gears gearbox
300/AB-SS/WG-SS range

Torque: 0 Nm - 26000 Nm

Quarter-turn stainless steel gear operators suitable for pharmaceutical, wash down, and corrosive environments.

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Rotork plc
worm gearbox / multi-turn
worm gearbox
MTW range

Torque: 0 Nm - 162000 Nm

The MTW range multi-turn worm gearboxes are used for applications such as sluice gates and dampers.

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Rotork plc
spur pinion gear reducer / right-angle / for asynchronous motors
spur pinion gear reducer
20 - 700 N

Power: 6 W - 40 W

... parallel shaft gears are primarily standard gearheads which are utilized for asynchronous motors. These gearheads are able to integrate with the motors, and permit the motor to be set ...

orthogonal gear reducer / for asynchronous motors
orthogonal gear reducer
100 - 700 N

Power: 25 W - 90 W

... Series has standard-type 1:3-1:200 gear ratios with maximum permissible torque of up to 40Nm. On the contrary, it has right angle-type 1:3-1:150 gear ratios and maximum permissible torque of up to 20Nm. ...

helical gear reducer / parallel-shaft / precision / compact
helical gear reducer
5.54:1 - 1600:1

Torque: 25000 Nm - 242000 Nm
Power: 2.2 kW - 1000 kW

In accordance to the well-tested unicase housing principle, the NORD industrial gear units have been improved in which the unicase is carried out from a unique jig and the futuristic machines. It offers high amount of ...

worm gear reducer / helical / orthogonal / robust
worm gear reducer
4.4:1 - 7095.12:1 | UNICASE

Torque: 94 Nm - 3058 Nm
Power: 0.12 kW - 15 kW

The right-angle worm gear reducer integrates all bearing seats into a single-piece casting. It eliminates all sealing surfaces that could deflect under the effect of radial forces. The device has a durable ...

worm gear reducer / orthogonal / high-speed / universal
worm gear reducer
5:1 - 3000:1 | UNIVERSAL SI

Torque: 21 Nm - 427 Nm
Power: 0.12 kW - 4 kW

... features, the Universal SI and MI worm gear by NORD DRIVESYSTEMS offers a high power density and the transferral of torque silently. These worm gears which are available in SI and ...

planetary gear reducer / coaxial / high-performance / compact
planetary gear reducer
RE series

Torque: 1000 Nm - 2500000 Nm

... including: mobile, drilling, marine, mining and industrial. Wide availability of customized solutions makes this range of gearboxes adaptable to any kind of application where a compact and reliable mechanical transmission is needed.

planetary gear reducer / high-performance / compact / industrial
planetary gear reducer
GB series

Torque: 1000 Nm - 2500000 Nm

... including: mobile, drilling, marine, mining and industrial. Wide availability of customized solutions makes this range of gearboxes adaptable to any kind of application where a compact and reliable mechanical transmission is needed.

coaxial gear reducer / heavy-duty / compact / transmission
coaxial gear reducer
RE series

Torque: 3000 Nm - 2000000 Nm

... .000 Nm to 160.000 Nm nominal torque, however special solutions are available for torque values up to 2.000.000 Nm. The gearboxes have a compact design and a strong output support suitable for applications with high ...

planetary gear reducer / coaxial / winch
planetary gear reducer
RW, WD series

Torque: 5000 Nm - 400000 Nm
Rotational speed: 2500 rpm - 5200 rpm

... Nm to 400.000 Nm nominal torque. It comprises rotating case gearboxes designed to fit inside the winch drum. In order to ensure an isostatic distribution of the load on the winch, the gearbox is designed ...

harmonic gear reducer / zero-backlash / high-load-capacity / with flange
harmonic gear reducer
HG series

Manufactured by Nexen, the harmonic gearheads feature a true zero backlash, high reduction ratios of 50/80/100/120:1, and a high load capacity. Designed with an advanced technology of diagonal roller ...

parallel shaft gear reducer / for pumps
parallel shaft gear reducer

Torque: 780 Nm - 2712 Nm
Power: 135 kW - 950 kW

... room for doubt at all. With their modular design, the company is able to deliver more than 5,000 configurations of torque, gear ratios, horsepower, hydraulic pump adapters, mounting options, and more options with their ...

planetary gear reducer / coaxial / winch / for vehicles
planetary gear reducer

Torque: 8135 Nm - 162696 Nm
Rotational speed: 2800 rpm - 4000 rpm
Power: 27 kW - 168 kW

... ratios of input gear deduction sets which are associated with the merging of the center section planetary gears allowing the reducer, swing and track drive applications be accommodated ...

planetary gear reducer / coaxial / for harsh environments
planetary gear reducer
AquaTRUE™

Torque: 876 Nm

... AquaTRUE™ Gearhead. It is designed with a 304 stainless steel housing that reduces opportunities for rusting and corroding, and without outer joints for bacteria to stay. This gearhead is built with ...

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Thomson Industries, Inc.
planetary gear reducer / coaxial / precision
planetary gear reducer
XTRUE™

Torque: 876 Nm

The XTRUE™ Series is a recently released precision gearhead, which is a compliment to the Micron® True Planetary™ Gearheads line. Featuring superior load capacity, as well as a flexible mounting system, simple to drop-in ...

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Thomson Industries, Inc.
planetary gear reducer / coaxial / low-noise
planetary gear reducer
ValueTRUE™

Torque: 2800 Nm - 2969 Nm

... storage space, reduced backlash, and has low noise, hassle-free function compared to the non-helical ones. True Planetary® gearhead has a very handy 3 mounting steps which are align, mount and tighten ...

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Thomson Industries, Inc.
planetary gear reducer / coaxial / precision
planetary gear reducer
UltraTRUE™

Torque: 3111 Nm - 3300 Nm

UltraTRUE™ is a true planetary gearhead that blends the positive elements of Helical Crowned gearing with True Planetary orientation to produce smooth and quiet gearheads on today's ...

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Thomson Industries, Inc.
planetary gear reducer / coaxial / low-backlash / precision
planetary gear reducer
EverTrue™

Torque: 1017 Nm

The EverTrue True Planetary® from THOMSON is a gear head that is highly durable and highly reliable with optimized performance. Its robust, special design is capable of running more than 30,000 hours in an everyday application ...

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Thomson Industries, Inc.
helical gear reducer / coaxial / high-rigidity / three-stage
helical gear reducer
250 series

Rotational speed: 13 rpm - 136 rpm

Delivering quality and reliable products, Bison Gear and Engineering Corporation designed the 250 Reducers to efficiently support a variety of applications while delivering optimum performance and efficiency. ...

spur gear reducer / helical / parallel-shaft / precision
spur gear reducer
881 series

Rotational speed: 12 rpm - 457 rpm
Power: 0.3 ch - 1.5 ch

The 811 model of reducers by Bison is constructed with high quality cast aluminum housing, with hardened steel helical and spur gears rated AGMA Class 11. The unit utilizes ball and needle bearings, ...

spur gear reducer / helical / parallel shaft / low-backlash
spur gear reducer
185 series

Rotational speed: 13 rpm - 30 rpm

Multi-tech Reducers 185 is a highly efficient NEMA gearbox and Gear trains that transmits 96% of the available power per stage. The low backlash ratings are less than 60 arc-minutes ...

spur gear reducer / helical / parallel shaft / low-backlash
spur gear reducer
385 series

Rotational speed: 30 rpm - 173 rpm

... the Multi-Tech Reducer 385 as any stepper of servomotor can be connected to the NEMA gearboxes. They are top in the industry providing enough helical-spur gear trains that transmit 96 percent of accessible ...

solid-shaft gearbox / custom
solid-shaft gearbox
UGD

Torque: 0.32 Nm

Johnson Electric gearboxes are a combination of Saia and Johnson Motor products. The devices are torque rated at 600 cNm. The range of gearboxes is constantly increasing in terms of standard sizes ...

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Johnson Electric
solid-shaft gearbox
solid-shaft gearbox
UGM

Torque: 1 Nm

... validations. UGM gear boxes have small dimensions of 51 x 65.2 x 15mm with a 4 x 10mm hardened steel shaft in plastic housing. Being compact, these gearboxes can accommodate very small spaces. Gearboxes ...

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Johnson Electric
solid-shaft gearbox
solid-shaft gearbox
UGB

Torque: 2.5 Nm

The gearboxes developed by JOHNSON ELECTRIC are designed to be used in conjunction with Saia and Johnson Motor products. The line offers models with torque ratings up to 600 cNm, and come in an expanding range of sizes ...

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Johnson Electric
solid-shaft gearbox
solid-shaft gearbox
UGF

Torque: 5 Nm

... Electric's range of gearboxes can be combined with the Saia and Johnson Motor products. The Torque rating goes to 600 cNm are currently available in the growing range of standard sizes and gear ratios ...

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Johnson Electric
solid-shaft gearbox
solid-shaft gearbox
UGV

Torque: 5 Nm

... Saia products. Offered by Johnson Electric, the gearboxes have torque ratings up to 600cNm and are available in a wide variety of standard gear ratios and sizes. This versatility allows for the ...

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Johnson Electric

How to choose this product

gear-reducer

A gear reducer is a gearing assembly that can reduce rotational speed while increasing torque in a mechanical system, or increase speed while reducing torque (in which case it is called a multiplier).

Applications

These devices are extremely common in a wide range of mechanical transmission applications, including automobile and motorcycle transmissions, in machine tools, variable speed drives and gear motors.

Technologies

There are four basic types of gear reducer:
- Straight (or straight sprocket, with straight-cut or cylindrical teeth)
- Worm gear (worm and wheel), with straight or helical teeth
- Bevel gear, with straight or helical teeth
- Planetary (epicyclic) gear

The term helical refers to tooth profile. Helical teeth can be found on any gear type. Note that in a rotating mechanism, speed and torque are inversely proportional.

How to choose

Choice of gear reducer will depend on the speed and torque of both the input and output shafts. These data can be used to calculate the reduction ratio. Another factor is the relative orientation of the input and output shafts: coaxial, parallel, perpendicular, convergent or not.

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