TNZ ZCA couplings manufactured by Ringfeder are torsionally stiff gear couplings designed to have some backlash. TNZ ZCB gear couplings come with a bolt-on O-ring carrier which facilitates installation by changing the mounting sequence. For mounting the coupling you should unscrew the cover and place it on the shaft. Afterwards the hub should be mounted onto the shaft, slide the sleeve onto the hub and fasten the O-ring carrier to the sleeve. Mounting implementation in this way is much more profitable if large couplings are involved. They both are made of high-quality steel and are suitable for use in temperature up to +120 °C if special seals are used.

General Features

• Suitable for the usage of  temperatures up to +120 °C if special seals are used
• Compact design results in a high-power density
• Torsionally rigid gear coupling made of high-quality steel
• Compensates for angular, radial and axial shaft offset
• Available with split sleeve (ZCA / ZCB - ZCA model range also available in ZCB design) and single-piece sleeve (ZCH)
• The elastic O-Ring can be replaced without having to move the coupled machines
• Torques up to TKn = 195,000 Nm / TKmax = 390,000 Nm
• Speeds up to nmax = 6,000 rpm
• Bores up to 270 mm

Toothing

The coupling housings have a straight internal toothing whilst the hubs have an external toothing with a chased variable radius. And the result is that the hub is able to move spatially within the housing causing angular, radial and axial shaft misalignment of the adjoined shaft ends within specified tolerances. Depending on the size and type of the coupling, the standard toothing permits an angular misalignment of up to 0.5 degrees per toothing-plane and an axial movement of several millimetres.  The maximum  possible radial shaft displacement depends on the distance between the two toothing planes. 

Material

These types of gear couplings have high-grade tooth profiles and grease with ultra high-pressure additives that guarantee low-restoring forces and a long serviceable life. The used material is forged steel with an apparent yielding point of at least 335 N/mm2. Sealing is carried out using O-Rings of synthetic rubber. The housings are centred and held together by fit-bolts and self-locking nuts.

Special Applications

If greater misalignments are anticipated at higher speeds and torques, an examination is necessary, performed with the assistance of a special computing programme. This is independent of the determined size. The value TKmax may not be exceeded in any state of operation (start-up, electrical short circuit, blocking, etc.).

Tolerances and Standards

The bore tolerance is ISO H7, if not differently ordered. The bore diameters listed refer to keyways to DIN 6885-1 with toleranz ISO P9.

Temperature

The usage of special seals permits the temperature limit to be raised to 120 °C.

Balance

At peripheral speeds upwards of 30 m/s it is advisable to dynamically balance the coupling.

Ringfeder-Product-Paper-Gear-Couplings.pdf

Ringfeder-Instruction-Manual-Gear-Couplings.pdf

Feel free to Contact Us if you have any questions, need more information or if you are interested in purchasing TNZ ZCA / ZCB series of gear couplings.

HVH Industrial Solutions is a distributor of Ringfeder.

We work closely with the Ringfeder engineering team to provide superior customer service and engineering support.