Oldham Couplings GN 2243

Bore code: B - Without keyway

Standard sheet GN 2243 Print this page Couplings - Highlights Keyway P9 DIN 6885 ISO Fundamental Tolerances Plastic Characteristics

Product description

Oldham couplings GN 2243 can compensate for large lateral shaft misalignments while transmitting high torques. As a result, they are used in applications with a focus on pure torque and power transmission associated with high lateral shaft misalignments.

The use of grub screws for clamping and the simple plug-in installation make oldham couplings very easy to assemble. They are suitable for a diverse range of applications and are used in general machine construction in packaging machines and pumps.

With the bore code K, the keyway is always integrated into both bores d₂ and d₃.

Specification

Hub
AluminumAL
Anodized, natural color

Spacer
Plastic (Polyacetal POM)KU
Temperature resistant up to 80 °C

Grub screws
- Steel, blackened
- For d₂ / d₃ ≤ 4, one grub screw
- For d₂ / d₃ > 4, two grub screws

Temperature range: -20 °C up to +80 °C

RoHS

GN 2243 Oldham Couplings with Grub Screw sketch

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Article options / Table

Bore code

B	Without keyway
K	With keyway (from d₁ = 20)

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d₁	d₂ - d₃ H8 recommended shaft tolerance h7

8	2-2	2-3	3-3	-	-	-
12	4-4	4-5	5-5	-	-	-
15	4-4	4-5	4-6	5-5	5-6	6-6
20	6-6	6-8	6-10	8-8	8-10	10-10
30	8-8	8-10	8-12	10-10	10-12	12-12
38	12-12	12-15	12-20	15-15	15-20	20-20

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d₁	d₄	d₅	l₁	l₂ recommended shaft insertion depth	l₃	Tightening torque of the screw in Nm ≈

8	M 2	3,1	9,6	2,5	1,3	0.3
12	M 3	5,2	14,2	3,9	2	0.7
15	M 3	8,2	16	4,4	2,2	0.7
20	M 4	12,2	21,4	5,8	2,9	1.7
30	M 4	16,2	32,5	10	5	1.7
38	M 5	20,3	40	12,1	6,1	4

Build & Price

Technical values

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d₁	Rated torque in Nm*	Max. torque in Nm*	Max. speed (min^-1)

8	0.5	1	78000
12	1	2	52000
15	1.6	3.2	42000
20	3.2	6.4	31000
30	15	30	21000
38	28	56	16000

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d₁	Moment of inertia in kgm²	Static torsional stiffness in Nm/rad	Max. shaft misalignment lateral in mm	angular in °

8	7.4 x 10^{^-9}	12	0.7	3
12	5.3 x 10^{^-8}	60	1	3
15	1.4 x 10^{^-7}	80	1	3
20	5.7 x 10^{^-7}	120	1.2	3
30	5.4 x 10^{^-6}	530	2	3
38	1.6 x 10^{^-5}	1500	2.5	3

*Load fluctuations are not taken into account

Temperature correction factors


If the ambient temperature is greater than 30 °C, the rated torque and the maximum torque must be adjusted using the temperature correction factors.
Ambient temperature						Temperature correction factor
-20 °C up to +30 °C						1
+30 °C up to +40 °C						0.8
+40 °C up to +60 °C						0.7
+60 °C up to +80 °C						0.55

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.

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.

$Statische Torsionssteife und Temperatur{St:_}GN 2242$

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.

$Rückstellkraft - Exzentrizität{St:_}GN 2242$

Selected Part (How to order)

Part number

Total (net)

14,53 €

plus VAT 2,76 €
gross 17,29 €

In stock

Weight: 0,003 kg

If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
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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 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 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 €

Quantity

All prices in accordance with our price list No. 56, valid from 1 September 2024, plus VAT only valid for Germany.