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GN 2240 Elastomer Jaw Couplings with Clamping Hub

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Bore code: B - Without keyway
Hardness: RS - 98 Shore A, red

GN 2240 Elastomer Jaw Couplings with Clamping Hub Bore code: B - Without keyway
Hardness: BS - 80 Shore A, blue

GN 2240 Elastomer Jaw Couplings with Clamping Hub Bore code: B - Without keyway
Hardness: WS - 92 Shore A, white

GN 2240 Elastomer Jaw Couplings with Clamping Hub Bore code: K - With keyway (from d<sub>1</sub> = 30)
Hardness: BS - 80 Shore A, blue

GN 2240 Elastomer Jaw Couplings with Clamping Hub Bore code: K - With keyway (from d<sub>1</sub> = 30)
Hardness: RS - 98 Shore A, red

GN 2240 Elastomer Jaw Couplings with Clamping Hub Bore code: K - With keyway (from d<sub>1</sub> = 30)
Hardness: WS - 92 Shore A, white

Standard sheet GN 2240 Print this page Highlights - Couplings Keyway P9 DIN 6885 ISO Fundamental Tolerances Plastic Characteristics

Product description

Information

Elastomer jaw couplings GN 2240 can transmit very high torques while compensating for shaft misalignments and runout tolerances. They are preferred in applications where the focus lies on pure torque and power transmission.

The choice of three coupling spiders with different hardness values allows the properties of the coupling to be optimally matched to the specific requirements. The clamping hubs and simple plug-in installation make jaw couplings very easy to assemble.

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

Specification

Hub
AluminumAL
Anodized, natural color

Coupling spider
Thermoplastic polyurethane (TPU)
Temperature resistant up to 60 °C

Hardness
80 Shore A, blueBS
92 Shore A, whiteWS
98 Shore A, redRS

Socket cap screws DIN 912
Steel, blackened

Temperature range: -20 °C up to +60 °C

RoHS

Accessory

Coupling Spiders GN 2240.1

Technical drawing

GN 2240 Elastomer Jaw Couplings with Clamping Hub sketch

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Article options / Table

Bore code

B	Without keyway
K	With keyway (from d₁ = 30)

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d₁	d₂ - d₃ H8 recommended shaft tolerance h7

14	3-3	3-4	3-5	3-6	4-4	4-5	4-6	5-5	5-6	6-6
20	5-5	5-6	5-8	6-6	6-8	8-8	-	-	-	-
30	8-8	8-10	8-12	8-14	10-10	10-12	10-14	12-12	12-14	14-14
40	12-12	12-14	12-15	12-16	14-14	14-15	14-16	15-15	15-16	16-16
55	18-18	18-19	18-20	18-25	19-19	19-20	19-25	20-20	20-25	25-25

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d₁	d₄		l₁	l₂ recommended shaft insertion depth	l₃	l₄		s recommended installation spacing

14	M 2	M 1,6*	22	7	3,5	4	5*	1
20	M 2,5	-	30	10	5	6,5	-	1
30	M 4	M 3**	35	11	5,5	10	11**	1,5
40	M 5	-	66	25	8,5	14	-	2
55	M 6	-	78	30	10,5	20	-	2

* for bore d₂ / d₃ = 6

** for bore d₂ / d₃ = 14

Build & Price

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Technical values

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d₁	Coupling spider	Shore hardness coupling spider	Rated torque in Nm	Max. torque in Nm	Max. speed (min^-1)

14	BS	80A	0.7	1.4	45000
14	WS	92A	1.2	2.4	45000
14	RS	98A	2	4	45000
20	BS	80A	1.8	3.6	31000
20	WS	92A	3	6	31000
20	RS	98A	5	10	31000
30	BS	80A	4	8	21000
30	WS	92A	7.5	15	21000
30	RS	98A	12.5	25	21000
40	BS	80A	4.9	9.8	15000
40	WS	92A	10	20	15000
40	RS	98A	17	34	15000
55	BS	80A	17	34	11000
55	WS	92A	35	70	11000
55	RS	98A	60	120	11000

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

14	BS	2.0 x 10^{^-7}	8	0,15	0,6	1
14	WS	2.0 x 10^{^-7}	14	0,1	0,6	1
14	RS	2.0 x 10^{^-7}	22	0,1	0,6	1
20	BS	1.1 x 10^{^-6}	16	0,2	0,8	1
20	WS	1.1 x 10^{^-6}	29	0,15	0,8	1
20	RS	1.1 x 10^{^-6}	55	0,1	0,8	1
30	BS	6.2 x 10^{^-6}	46	0,2	1	1
30	WS	6.2 x 10^{^-6}	73	0,15	1	1
30	RS	6.2 x 10^{^-6}	130	0,1	1	1
40	BS	3.7 x 10^{^-5}	380	0,15	1,2	1
40	WS	3.7 x 10^{^-5}	570	0,1	1,2	1
40	RS	3.7 x 10^{^-5}	1200	0,1	1,2	1
55	BS	1.6 x 10^{^-4}	1400	0,2	1,4	1
55	WS	1.6 x 10^{^-4}	1600	0,15	1,4	1
55	RS	1.6 x 10^{^-4}	2600	0,1	1,4	1

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

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.
Angular The axes of the shafts do not lie in the same plane; they meet at a certain angle.
Axial The shafts move axially along the axis of rotation.
Runout The shafts move radially out of the center of the axis of rotation.

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.

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.

Selected Part (How to order)

Part number

Total (net)

31,66 €

plus VAT 6,02 €
gross 37,68 €

In stock

Weight: 0,009 kg

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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.