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Safety couplings or torque limiters from JAKOB Antriebstechnik protect your drive effectively in the event of collisions from costly damage caused by overload.
No (285)
Yes (223)
direct (149)
indirect (74)
Maximum torqueUsually, the size of the coupling is chosen according to the required torque. For exact determination of the necessary drive torque, difficult calculations are neccessary (see formularies). If the size of the motor is fixed, the necessary nominal torque of the coupling TKN can be calculated as follows:
TKN > 1,25 • TA max • i
TAmax = peak torque of the motor
i = transmission / reduction of the toothed belt drive or the spur-toothed wheel
Set-Screw Hub Shaft-hub connection using one or more radially arranged set screws. Cost-effective design for smaller torques, such as miniature couplings. Fitting clearance from 0.01mm to 0.05mm. If possible, avoid damaging the drive shaft with the aluminum ball or flat surface.
Clamping Ring Hub Easy-to-assemble shaft-hub connection with a radially arranged clamping screw (DIN-ISO 4762-12.9). KG-HS series with two clamping screws in a 180° arrangement for optimal balancing quality. Safe, backlash-free and non-positive transmission of the nominal torque. Standard tolerance of the hub bore D1/D2 is "G6" or "G7". Permissible fitting clearance from 0.01mm to 0.04mm. Generally with an additional EASY Clamp pin for easy disassembly by widening the clamping hub bore.
Keyway connection Optional upon customer request for shafts with an additional keyway in accordance with DIN6885. On request with surcharge. Groove tolerance “JS9” or “P9” as standard. Due to the positive shaft-hub connection, forced driving is guaranteed.
Half Shell Hub The half-shell hubs are divided and consist of a fixed and a loose half. The fixed half-shell parts can be placed on the permanently aligned shaft journals. This can make assembly considerably easier, since, for example, there is no need to subsequently move and align the motor shaft. The two clamping screws should be tightened as evenly as possible and the gap dimensions should be checked. Permissible fitting clearance from 0.005mm to 0.04mm. It is essential to check whether the specific coupling dimension "g" is slightly smaller than the frontal shaft distance "A".
Cone Clamping Hub A backlash-free, non-positive shaft-hub connection using a cone clamping hub ensures the transmission of very large torques, even with small shaft diameters. The rotationally symmetrical structure ensures high balancing qualities and operating speeds. However, the assembly process is complex and cannot be carried out radially. The cone bushing is pressed in axially by tightening several fastening screws (at least 6 pieces) crosswise, if possible several times. Permissible fitting clearance from 0.005mm to 0.02mm. Several extraction threads are provided for the loosening process.
Cone Clamping Ring Hub A backlash-free, non-positive shaft-hub connection using a cone clamping ring hub ensures the best possible torque transmission and, thanks to the rotationally symmetrical structure, optimal balancing qualities. In addition, there is no axial displacement of the hub during the clamping process. However, the assembly process is complex due to the tightening of the cone clamping ring using several clamping screws and cannot be carried out radially. Permissible fitting clearance from 0.005mm to 0.02mm. Several extraction threads are provided for the loosening process.
Expanding Cone Hub Expanding cone hub for compact, integrated attachment to a hollow shaft with a short overall length. Simple, axial operation thanks to a centrally located clamping screw. Variable expansion cone pin ØD2 with standard tolerance "g6" for bore tolerance "H7" - please note D2min or D2max!
Clamping-Ring Hub (91)
Conical-Clamping Hub (86)
Keyway-Connection (45)
Radial-Clamping Hub (176)
Set-Screw Hub (17)
Split-Hub (93)
When selecting the hub bores, the type-specific information for the minimum diameter Dmin and maximum diameter Dmax must be observed. Smaller hub bores below Dmin are often possible, but transmission of the full nominal torque is not guaranteed. Furthermore, it must be checked whether the standard bore tolerance of G6 or G7 is suitable for the existing shaft tolerance. Different bore tolerances are possible on request. Please note that for safety couplings for direct drives, the specification D2 is specified for the side of the safety part.
Torsional rigidity: CTK - [Nm/arcmin] When specifying the specific torsional stiffness values (torsional stiffness) of all coupling series, a change was made from the previous unit specification [1kNm/rad] to the unit “newton meter per angular minute”. This makes it quite easy for the designer to determine the corresponding torsion angle errors based on the operating torque. 60 angular minutes (or arc minutes) correspond to one angular degree. This results in the conversion factor 1 rad ≙ 57.3° ≙ 3438 arcmin. [1Nm/arcmin ≙ 3.44kNm/rad]
The type-specific values can be viewed in the data sheet of the respective coupling.
+ (228)
++ (115)
+++ (91)
How large is the required shaft compensation?
The specification +,++,+++ refer to the lateral shaft misalignment, since the axial and angular misalignment are usually rather unproblematic.
The maximum permissible values for the shaft misalignments can be found in the data sheet of the respective coupling. If the permissible offset values are exceeded, fatigue fractures on the metal bellows or excessive wear of the elastomer spider may occur.
+ (281)
++ (73)
+++ (80)
Operating temperatures
As an all-metal coupling, metal bellows couplings are extremely insensitive to temperature. Series with aluminum clamping hubs can be used without restrictions from -40 ° C to 150 ° C, briefly up to + 200 ° C. In the case of series with welded steel or stainless steel hubs, the maximum operating temperature is 350 ° C. The application limit of the elastomer couplings is 90 ° C (98 Sh-A) or 120 ° C (72 Sh-D).
Drive RPM:
The type-specific maximum permissible operating speed can be taken from the respective data sheet. Coupling types with rotationally symmetrical hub variants, as well as welded bellows-hub connections are particularly suitable for high speeds and good balance quality. In the case of spacer couplings, the bending-critical speed calculation of the intermediate tube usually determines the speed limit.
In general, all coupling types can be supplied in balanced or fine-balanced design.
+ (112)
++ (133)
+++ (21)
++++ (6)
The axial pluggability is achieved by a backlash-free keyway connection in whole metal version (aluminum anodized). For this, one part of the hub is delivered as a conical carrier, the counterpart with a congruent conical keyway.
No (251)
Yes (153)
Very seldomly, metal bellows couplings may have resonance sounds (e.g. a whistling or a humming). A type of coupling with significantly higher torsional stiffness or vibration dampening elastomer couplings should be used here.
Electrically insulating couplings, such as elastomer couplings with their plastic element (spider), are required if no static charge may be passed on.
No (260)
Yes (144)
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