Shrink disc RfN 4071

Standard series for high torques
Shrink discs are among the most advanced types of shaft-hub connections. Depending on the version, they essentially consist of one or two conical pressure rings and an inner ring. These elements are axially clamped against each other using clamping screws. The main difference from other internal clamping connections is that the pressure is applied from the outside onto the hub. This means the shrink disc is not located in the primary force flow. Instead, the torque is transmitted frictionally between the shaft and the hub at the contact surface without any intermediate element. This allows a shrink disc to create a press fit (shrink fit) for high-load shaft-hub connections in a simple and cost-effective manner.

This offers significant advantages over conventional methods that required complex calculations, tight manufacturing tolerances, and difficult assembly/disassembly. In repairs, there are no problems regarding interchangeability or centering. No other shaft-hub connection type offers comparable properties in terms of fatigue strength and concentricity.

Unlimited application possibilities – RINGFEDER shrink discs are suitable for fixing all types of hub components on shafts and axles. They can be used wherever shrink fits, keyways, polygonal connections, splined shafts, etc., were previously applied. They ensure absolutely reliable fixation of gears, chain wheels, levers, cams, rollers, belt or brake discs, flywheels, couplings, flange gears, rope pulleys, and running wheels.

• Standard series for high torques – most commonly used shrink disc. The transmitted torque can be adapted to the design requirements by adjusting the tightening torque.
• Slotted inner ring – low contact pressure and force loss on shaft and hub.
• Compensation of small tolerance errors.
• Maximum reliability – suitable for static, dynamic, and shock loads.
• Simple component manufacturing – only minimal requirements for functional surfaces.
• Easy replacement – RINGFEDER shrink discs operate without any form fit.
• Easy installation – no shoulder, key, or pin required. Can be mounted anywhere on the shaft with standard screws and tools. No additional machining or fitting work necessary.
• Easy disassembly – once the screws are loosened, the shrink disc releases automatically and can be moved freely along the shaft.
• Low sensitivity to dirt – extended service life, as the contact surfaces press firmly against each other when screws are tightened. Dirt and moisture cannot penetrate the contact area.

Shrink discs GT (split version)
In such arrangements, longer clamping screws are required depending on the dimension X, which must be ordered separately. If the dimension "X" exceeds 2·L1 (RfN 4071 standard series), the transmissible torque of the GT type may be reduced by up to 50%.

Surfaces
For shaft diameter dw: surface roughness Ra ≤ 3.2 µm