Gear Couplings TNZ ZCAK/ZCBK

Type with limited end ﬂoat

The double cardanic versions RINGFEDER^® TNZ ZCAK and RINGFEDER^® TNZ ZCBK are equipped with a limitation of the end float. The limitation of the end float serves to axially locate a shaft that is mounted on sleeve bearings. he rotor of an electric motor with sleeve bearings can thus be aligned within a desired tolerance range via the coupling to the bearing of the driven machine, so that the rotor remains at its magnetic centre during acceleration of the driving machine. The limitation of the end float constrains the ability to compensate for angular and radial shaft misalignments. In contrast to the TNZ ZCAK with integrated O-ring, the TNZ ZCBK has screwed-on, separate O-ring supports.

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TNZ ZCAK/ZCBK

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Size	Identifier ZCA	T_KN Nm	n_max 1/min	d_1kmin mm	d_1kmax mm	D₁ mm	D₆ mm	L mm	Gw_sb kg
69	XC2706	1750	6000	12	50	111	81,5	89	4,0
85	XC2708	2750	4600	18	60	152	103,5	103	8,4
107	XC2710	5500	4200	28	75	178	127,5	127	14,1
133	XC2713	8500	4000	40	95	213	156	157	24,8
152	XC2715	13500	3850	50	110	240	181	185	36,4
179	XC2717	22000	3700	60	130	280	209	216	58,0
209	XC2720	35000	3200	70	155	318	245,5	245	87,0
234	XC2723	43000	2900	85	175	346	274	278	113,7
254	XC2725	68000	2600	95	190	389	307	308	163,1
279	XC2727	82000	2300	110	210	425	334,5	358	215,4
305	XC2730	150000	2100	120	230	457	366	388	261,5
355	XC2735	195000	1800	130	270	527	423	450	409,2

Size	Identifier ZCA	T_KN ft-lbs	n_max rpm	d_1kmin inch	d_1kmax inch	D₁ inch	D₆ inch	L inch	Gw_sb lbs
69	XC2706	1291	6000	0.472	1.969	4.370	3.209	3.504	8.8
85	XC2708	2028	4600	0.709	2.362	5.984	4.075	4.055	18.5
107	XC2710	4057	4200	1.102	2.953	7.008	5.020	5.000	31.1
133	XC2713	6269	4000	1.575	3.740	8.386	6.142	6.181	54.7
152	XC2715	9957	3850	1.969	4.331	9.449	7.126	7.283	80.2
179	XC2717	16227	3700	2.362	5.118	11.024	8.228	8.504	127.9
209	XC2720	25815	3200	2.756	6.102	12.520	9.665	9.646	191.8
234	XC2723	31716	2900	3.346	6.890	13.622	10.787	10.945	250.7
254	XC2725	50155	2600	3.740	7.480	15.315	12.087	12.126	359.6
279	XC2727	60481	2300	4.331	8.268	16.732	13.169	14.094	474.9
305	XC2730	110636	2100	4.724	9.055	17.992	14.409	15.276	576.5
355	XC2735	143826	1800	5.118	10.630	20.748	16.654	17.717	902.1

Images & Drawings

Characteristics

General features

Torsionally rigid gear coupling made of high-quality steel
Very compact design results in a high-power density
Compensates for angular, radial and axial shaft offset
Suitable for use in temperatures up to +120 °C if special seals are used
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
Bores up to 270 mm
Torques up to T_Kn = 195,000 Nm / T_Kmax = 390,000 Nm
Speeds up to n_max = 6,000 rpm

General description

The RINGFEDER^® TNZ coupling is a torsionally rigid twin cardanic gear coupling.

Toothing

The coupling housings have a straight internal toothing whilst the hubs have an external toothing with a chased variable radius. As a result, the hubs can move spatially within the housing and thus compensate angular, radial and axial shaft misalignment of the adjoined shaft ends within specified tolerances. Depending on coupling type and size, the standard toothing permits an angular misalignment of up to 0.5 degrees per toothing-plane and an axial movement of several millimetres. The max. possible radial shaft displacement is dependent on the distance between the two toothing planes. Other toothing geometries can be used for further specific applications.

Materials

High-grade tooth profiles and grease with ultra high-pressure additives guarantee low-restoring forces and a long serviceable life. The material used is forged steel with an apparent yielding point of at least 335 N/mm². Special materials can be used for further specific applications. Sealing is carried out using O-Rings of synthetic rubber. The housings are centred and held together by fit-bolts and self-locking nuts.

Temperature

The use 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.

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 T_Kmax may not be exceeded in any state of operation (start-up, electrical short circuit, blocking, etc.).