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GN 2244 Bellows Couplings Aluminum, with Clamping Hub

Bellows Couplings GN 2244: Aluminum, with Clamping Hub

Overview of Couplings Couplings - General Notes Assembly Instructions Couplings Technical Information Couplings - Highlights ISO Fundamental Tolerances Stainless Steel Characteristics

Product description

Bellows couplings GN 2244 transmit angle positions and torques with extreme precision and zero backlash. The metal bellows also reliably compensates for shaft misalignments and runout tolerances. The clamping hubs make bellows couplings very easy to install.

They are used in applications where precise position and movement transmission is required, such as in the servo drive systems of machine tools and in industrial robots.

Specification

Hub
AluminumAL
Anodized, natural color

Bellows
Stainless steelNI AISI 304

Socket cap screws ISO 4762
Steel, blackened

Crimp ring
Brass

Operating temperature up to 120 °C

RoHS

On request

Bore with keyway

GN 2244 Bellows Couplings, Aluminum, with Clamping Hub sketch

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Article options / Table

Bore code

B	Without keyway

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d₁	d₂ - d₃ H8 recommended shaft tolerance h7

19	5-5	5-6	5-8	6-6	6-8	8-8
27	6-6	6-8	6-10	8-8	8-10	10-10
32	10-10	10-12	10-14	12-12	12-14	14-14
40	12-12	12-15	12-19	15-15	15-19	19-19

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d₁	d₄	l₁	l₂ recommended shaft insertion depth	l₃	l₄	Tightening torque of the screw in Nm ≈

19	M 2	30	10,5	3	6,8	0,5
27	M 2,5	35	12,5	3,5	10,3	0,9
32	M 3	46	15,5	4,3	12	1,5
40	M 4	51	16	5	15	3,5

Build & Price

Technical values

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d₁	Rated torque in Nm	Max. speed (min^-1)	Moment of inertia in kgm²	Static torsional stiffness in Nm/rad

19	1.5	33000	8.6 x 10^{^-7}	170
27	2.3	23000	3.6 x 10^{^-6}	800
32	4.5	19000	1.1 x 10^{^-5}	1600
40	10	15000	2.8 x 10^{^-5}	2700

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d₁	Max. shaft misalignment lateral in mm	axial in mm	angular in °

19	0.15	± 0.5	1.5
27	0.15	± 0.5	1.5
32	0.2	± 0.7	1.5
40	0.2	± 1	1.5

Misalignment and runout tolerances


Like all mechanical parts, shafts are subjected to manufacturing and assembly tolerances that generally cannot be entirely eliminated even with extensive technical measures. If these deviations are not taken into account in the design, the result can be vibrations, running noises, and wear or damage to the shafts and their bearings. Suitable couplings not only are able to effectively compensate for misalignment and runout errors, they also greatly simplify the assembly process, thereby reducing the overall labor required. Shaft misalignment and runout errors can vary in nature and should always be taken into consideration when selecting the appropriate coupling.
Error type						Misalignment diagram
Lateral The axes of the shafts are in fact parallel, but they are offset laterally and do not line up.						$Misalignment diagram{St:_}Lateral$
Angular The axes of the shafts do not lie in the same plane; they meet at a certain angle.						$Misalignment diagram{St:_}Angular$
Axial The shafts move axially along the axis of rotation.						$Misalignment diagram{St:_}Axial$
Runout The shafts move radially out of the center of the axis of rotation.						$Misalignment diagram{St:_}Runout$

Shaft insertion depth

For correct fastening of the coupling hubs, the shaft must be installed according to the recommended shaft insertion depth l₂. The shaft insertion depth l₂ is specified in the standard sheet of the respective coupling.
If the insertion depth is too low, the shaft could slip out of the coupling, or the clamping hub could break. If the shaft is inserted too far, this can cause interference within the coupling, leading to damage.

Application example

Static torsional stiffness and temperature

The diagrams show the change in static torsional stiffness within the permissible operating temperature range, under the assumption that the static torsional stiffness at 20 °C is 100 percent. The torsional stiffness of the couplings decreases with increasing temperature.

Statische Torsionssteife und Temperatur | GN 2244

Restoring force – Eccentricity

When the shaft ends are installed in eccentric arrangements, the coupling constantly attempts to return to its neutral position. The resulting force is referred to as restoring force.
If the couplings are installed with the lowest possible eccentricity, the resulting restoring forces are lower. This also reduces the force acting on the shaft bearing.

Rückstellkraft - Exzentrizität | GN 2244

Restoring force – Pressure

If the coupling is under pressure, subject to compressive load in the axial direction, it will strive to return to its neutral position. The force that counteracts the compressive force is referred to as restoring force.
Lowering the compression acting on a coupling results in a lower restoring force and less force exerted axially. This must always be taken into account in dimensioning the coupling.

Selected Part (How to order)

Part number

Total (net)

68,28 €

plus VAT 12,97 €
gross 81,25 €

Weight: 0,016 kg

If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone +49 7723 6507 - 0

RoHS: Yes

This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances).

Customs tariff number

84836080

Please note our order discounts.

With a total value (net) per order:
from 200,00 € -> 10 % discount
from 300,00 € -> 20 % discount
from 400,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 49,99 €

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