Our Technology Wiki: Everything worth knowing at a glance

These gearboxes are optimized for application-specific requirements. Hygienic Design gearboxes meet the sensitive requirements in the food and pharmaceutical sectors. For use in industrial fork lift trucks, the clever concept of the NGV planetary gearbox with matching wheel offers a solution with added value.

There are several types of gearings used in gearboxes. For details see:

Low-friction deep groove ball bearings

Reinforced deep groove ball bearings

Preloaded tapered roller bearings

Preloaded angular contact roller bearings

A bevel gear set with straight gearing and a 1:1 transmission ratio is used for the angle step. This angle step technology combines a low installation space requirement with high performance capability. The two axes operate on one level, i.e. without an axis offset.

Bevel gearboxes can be realized using bevel gears with straight, helical or spiral teeth. The axes of bevel gearboxes usually intersect at an angle of 90 degrees, whereby other angles are also basically possible.

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The input and the output shafts are in a straight line.

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The drive shaft and the output shaft rotate in opposite directions.

The economical gearbox model series with an outstanding price/performance ratio. The Economy model series impresses with high precision of up to 6 arcmin of torsional backlash and a high performance density, a wide range of variants and numerous adaptation options.

The typical area of application is wherever high resistance of the seals exposed to hot water and steam is required (temperature range -50°C to +140°C). Moreover, EPDM has very good aging and ozone resistance. The chemical resistance, even to oxidizing agents, is very advantageous.

In an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with external teeth on a concentric orbit.

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See Planetary gearing

The input and the output shaft rotate in the same direction.

The large installation flange with 8 or 12 screw-on holes makes the transmission of extremely high torques possible.

The long centering collar moves the output bearing closer to the application and thus improves the support of the radial forces without increasing the axial installation space.

An FFKM seal can optionally be used for greater resistance to chemicals and heat.

In principle, flange gearboxes and planetary gearboxes with an output shaft are similar. There is, however, one very important difference: the short flange shaft geometry. Accordingly, gearboxes with a flange output are characterized by their axially compact design.

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The standardized flange interface in accordance with ISO 9409-1 guarantees of quick and easy installation of drive components such as belt pulleys, linear units and turntables. The torsional stiffness of this gearbox is several times greater than those versions with normal output shafts. The integrated dowel pin drill hole provides additional stability during installation. The gearbox is also optionally available without a dowel pin drill hole, but comes with with a different thread instead.

There are several types of gearings used in gearboxes. For details see:

Spur gearing

Helical gearing

Bevel gear right angle stage

Hypoid gear right angle stage

Helical teeth reduce the amount of operating noise. Vibration is reduced to a minimum. The surface quality is therefore increased when used in processing machines.

A hollow shaft with 1-stage gearboxes allows flexible line leadthrough towards the application.

A hollow shaft makes it possible to use a clamping system with a shrink disc for force-fitting connection of the machine shaft. Clamping at both sides is possible, and lines can also be led through.

Because of its hypoid teeth, this right angle gearbox operates smoothly and with little vibration. Another advantage of this type of gearing is low noise generation. Both axes are offset to each other, i.e. they are on different levels.

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Hypoid gearboxes can be categorized as bevel gearboxes. A special feature of hypoid gearboxes is that the axes cross on two parallel planes. Hypoid gearboxes therefore have an axis offset, unlike other bevel gearboxes.

Thanks to the low-friction bearing concept, the gearbox is optimally designed for fast rotation speeds. The low heat development of this bearing makes permanently fast rotation speeds possible without affecting performance.

A reduced mass inertia increases the dynamics of the transmission and allows the use of smaller, lighter motors.

With single spur gears, a pair of gears forms a gear stage. If you connect several gear pairs one after another, this is known as a multi-stage gearbox.

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Various designs can be used for the output flange. For examples see:

Round type output flange

Square output flange

Round, extra large output flange

Extra long centering collar

Various designs can be used for the output shaft. For examples see:

Flange output shaft according to ISO 9409

Hollow shaft

Hollow shaft for clamping system with shrink disc

Splined output shaft (DIN 5480)

See Planetary gearbox with mounted pinion

The cage design of the planetary carrier increases the torsional stiffness of the gearbox considerably, since the planets are supported at both sides. The gearbox becomes more torsionally rigid with much more accurate positioning. Greater torque can also be transmitted.

The planets are supported at one side in the disk version of the planetary carrier. With this planetary carrier design, the mass inertia of the gearbox is reduced and the dynamics are therefore significantly increased.

The planetary gearboxes are combined with helical-cut or straight-cut pinions, and can be installed directly into your rack-and-pinion application.

In an planetary or epicyclic gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with external teeth on a concentric orbit.

See Epicyclic gearing

The Precision Line is suitable for anyone who wants precision.The standard torsional backlash of 3 arcmin and optionally 1 arcmin provides maximum precision for the application. Special bearing and gasket technologies and cagetype planetary carriers increase the performance of the Precision Line. The model series is completed by special low-vibration and high-performance right angle gearboxes with hypoid teeth.

Inclined roller bearings arranged in pairs with a large diameter make maximum radial and axial force possible. The tilting moment of the gearbox also increases to a considerable extent. Gearboxes equipped with inclined roller bearings are ideal for rotary tables or rack and pinion applications.

Tapered roller bearings that are pre-stressed in pairs provide additional, permanent rigidity. Even with variable operating directions, the output bearings remain exact.

Higher transmission ratios can be achieved by connecting several planetary stages in series. For example, a planetary gearbox with a ratio of 20:1 can be produced from the individual ratios 5:1 and 4:1.  For a planetary stage, a technically sensible and at the same time economical ratio range is from approx. 3:1 to 10:1. The reason for this is the ratio of the number of teeth. From a ratio of 10:1, the driving gear becomes very small. This has a negative effect on the gear geometry and on the transmittable torque. By combining the various individual ratios per planetary stage, a very high variety of total ratios is produced in the planetary gearbox from i=3 to i=512.

Reduced backlash with < 1 arcmin for coaxial gearboxes, or < 3 arcmin for right angle gearboxes can be optionally selected for maximum accuracy.

Neugart planetary gearboxes are connected to the motor shaft via a clamping system.
There is a wide range of motor shaft diameters on the market, but the clamping system is only available in certain sizes. The diameters in between are accommodated by means of a reducing bushing.
In these cases, the gearbox is supplied with the appropriate reducing bushing. You will find an overview of the available clamping systems and the matching reducing bushings in the Neugart catalog.

Extra-large deep groove ball bearings make it possible to absorb high levels of radial and axial force. The drive elements can be fitted directly to the output shaft without additional bearing components.

The input shaft and the output shaft are offset from each other by 90°.

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The pre-tensioned radial shaft seal designed by Neugart resists dust and jets of water achieving an IP65 protection class.

The standard interface for uncomplicated, easy assembly. A threaded hole in the machine unit or countering with threaded nuts is not required. The gearbox is directly attached to the threaded holes in the gearbox at the application side with four screws.

There are several types of seals used in gearboxes. For examples see:

Rotary shaft seal

FFKM seal

EPDM seal

A splined output shaft in accordance with DIN 5480 can be optionally used.

Maximum torques can be transmitted with straight teeth. This significantly increases the performance density of the gearbox.

Because of the square output flange, the gearbox can be screwed directly to the machine without an intermediate flange. The output flange with through holes makes simple but secure installation and universal accessibility possible.

The increased number of holes and threads on the flanged output shaft and output flange increase the rigidity of the interface connection - thus allowing higher torques to be transmitted.

See torsional stiffness

The torsional stiffness (also called torsional rigidity) depends, among other things, on the output shaft and the gearbox type. A flange output shaft has a higher torsional stiffness than a simple shaft.

High torsional stiffness is advantageous wherever high loads have to be moved dynamically and positioned precisely.