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GN 2248 High Response Couplings Aluminum, Vulcanized, Vibration-Damping, with Clamping Hub

High Response Couplings GN 2248: Aluminum, Vulcanized, Vibration-Damping, with Clamping Hub

Overview of Couplings General Information for Couplings Mounting Information for Couplings Technical Information for Couplings ISO Fundamental Tolerances Plastic Characteristics

Product description

High response couplings GN 2248 transmit angular positions and torques with high precision and zero backlash. The elastomer element bonds the clamping hubs together, compensating for shaft misalignments and runout tolerances. The clamping hubs ensure easy installation.

High response couplings GN 2248 are primarily used in applications where precise position and motion transmission is required, e.g., in drive technology on test benches or similar applications.

Specification

Hub
AluminumAL

Elastomer element
Hydrogenated acrylonitrile butadiene rubberH
(HNBR)

Black
Hardness 75 ±5 Shore A

Operating temperature -20 °C to +80 °C

Socket cap screws ISO 4762
Steel, blackened

RoHS

GN 2248 High Response Couplings, Aluminum, Vulcanized, Vibration-Damping, 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						d₄	l₁	l₂ Max. shaft insertion depth	l₃	l₄

15	4-4	4-5	5-5	-	-	-	M 1,6	23	6,5	2,15	5
19	5-5	5-6	5-8	6-6	6-8	8-8	M 2	26	7,7	2,65	6,5
25	6-6	6-8	6-10	8-8	8-10	10-10	M 2,5	32	9,5	3,25	9
30	8-8	8-10	8-12	10-10	10-12	12-12	M 3	36	11	4	11
39	12-12	12-14	12-16	14-14	14-16	16-16	M 4	48	15,5	4,5	14,5
56	20-20	20-25	25-25	-	-	-	M 5	60	19,5	5,5	20

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d₁	Tightening torque of the screws in Nm ≈	Rated torque in Nm	Max. rotational speed (rpm)	Moment of inertia in kgm²	Static torsional stiffness in Nm/rad	Max. shaft offset Lateral in mm	Axial in mm	Angular in °

15	0,25	1,1	42000	2,3 x 10^{^-7}	43	0,15	± 0,2	1,5
19	0,5	2,1	33000	6,9 x 10^{^-7}	88	0,15	± 0,2	1,5
25	1	4	25000	2,5 x 10^{^-6}	140	0,15	± 0,2	1,5
30	1,5	6,3	21000	6 x 10^{^-6}	220	0,2	± 0,3	1,5
39	2,5	13,5	16000	2,3 x 10^{^-5}	520	0,2	± 0,3	1,5
56	7	35	11000	1,2 x 10^{^-4}	1500	0,2	± 0,3	1,5

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Technical values

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d₁	Rated torque in Nm	Max. rotational speed (rpm)	Moment of inertia in kgm²	Static torsional stiffness in Nm/rad	Max. shaft offset Lateral in mm	Axial in mm	Angular in °

15	1,1	42000	2,3 x 10^{^-7}	43	0,15	± 0,2	1,5
19	2,1	33000	6,9 x 10^{^-7}	88	0,15	± 0,2	1,5
25	4	25000	2,5 x 10^{^-6}	140	0,15	± 0,2	1,5
30	6,3	21000	6 x 10^{^-6}	220	0,2	± 0,3	1,5
39	13,5	16000	2,3 x 10^{^-5}	520	0,2	± 0,3	1,5
56	35	11000	1,2 x 10^{^-4}	1500	0,2	± 0,3	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.
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.

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.

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)

40,29 €

plus VAT 7,66 €
gross 47,95 €

Weight: 0,009 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 €