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NMTG offers High quality products shrink discs (External Clamping Devices) are flange-shaped, friction-locked shaft-hub connections and are a more powerful and reliable alternative to traditional compression fit, wedge, keyway connections. Pressure is applied externally to the hollow shaft or hub, thus creating an absolutely backlash-free, friction-locked connection between the shaft and the hub.
Depending on customer-specific requirements, our shrink discs are available in proven standard and specially developed special variants, in two- and three-part designs as well as in stainless steel. In addition to torque and bending loads, axial and radial loads can also be transmitted.
Two Part Shrink Disc
Two part shrink disc is characterized by an extremely flat single taper and similarly transfers the required torque in a taper interference fit. The screws on the shrink disc can be tightened without using a torque wrench and thus the disc can be mounted quickly and easily.
Three Part Shrink Disc
Three part shrink disc is characterized by steep double taper and similarly transfers the required torque to the taper interference fit. Our shrink discs can be easily and quickly assembled and disassembled.
Three part design, Light torque capacity
Three part design, Standard range Models for High torques
Three part design, Heaviest, Highly Strong Range
Low torques (10.9 Grade Bolts)
Average torques (10.9 Grade Bolts)
High torques (10.9 Grade Bolts)
Very high torques (10.9 Grade Bolts)
As series 22 but with 20 - 30 % higher torque capacity (12.9 Grade Bolts)
High torques, Easy, quick assembly without a torque wrench (12.9 Grade Bolts)
Shrink Discs are external clamping device for the backlash free fastening of hollow shafts or hubs to shafts. By tightening clamping screws conical surfaces are pulled together generating radial forces; these forces press the hollow shaft on to the shaft. Torques or axial forces can be transmitted frictionally from the hollow shaft to the shaft. The Shrink Disc itself is not involved in the transmission of torques or axial forces. The radial clamping forces which act through the circumference of the hollow shaft also ensure an optimum centring to the shaft.
Two Part Shrink Disc - The stepped taper outer ring is pulled onto the stepped taper inner ring by tightening the clamping screws. A radial clamping force is generated by the taper surfaces, The radial clamping force presses the hollow shaft onto the shaft and creates a frictional bonded connection at the contact surfaces between the shaft and the hollow shaft. Thereby, torque / axial force can be transmitted between the shaft and the hollow shaft. Two Part Shrink Disc NSD models have flatter cone angle. The compensation of the clearance is very limited.so that tight tolerance are required.
Three Part Shrink Disc - The front nut and rear nut are pulled together over the inner ring by tightening the clamping screws. A radial clamping force is generated by the taper surfaces. The radial clamping force presses the hollow shaft onto the shaft and creates a frictional connection at the contact surfaces between the shaft and the hollow shaft. Thereby, torque / axial force can be transmitted between the shaft and the hollow shaft. Three Part Shrink Disc N40XX models have larger cone angle, as a result of slitted inner ring, a larger clearance between shaft & hub diameters can be compensated.
The main function of a shrink disc is the safe connection of a shaft with a hub by means of friction. For example, between a drive shaft and a transmission hollow shaft. The shrink disc generates a Backlash-free connection by pressing the hub onto the shaft. This connection is mainly used to transmit torque.
Advantages:
NSD Series
Benefits
N4051, N4071 & N4091 Series
Benefits
Shrink discs are the modern method for creating a mechanical shrink fit. Our shrink discs offer many advantages over keyed ways and splined shafts including smaller and lighter shafts, less cost of ownership and ease of maintenance.