Barrel Couplings TNK TKV

The RINGFEDER^® barrel coupling consists of a sleeve, made of reinforced-material, equipped with semi-circular internal teeth and a hub, made of reinforced-material, with semi-circular external teeth of the same shape. In the resulting circular recording hardened steel barrel rollers are used, which serve as power transmission elements. Lock rings on both sides of the barrel rollers serve for their axial guidance. Inner and outer covers, each of which is equipped with a lip seal, effectively prevent foreign matter from entering and lubricant from escaping.

The proven design with hub and housing made of high-strength material allows more torque and higher radial force in the same space

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TNK TKV

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Identifier	Size	T_Kmax Nm	F_rad N	d_1kmax mm	D mm	L mm	L_min mm	D₁ mm	H₂ mm	F_K mm	C mm
WG7125	25	6500	17500	66	250	95	85	95	42	12	220
WG7128	50	8400	20000	77	280	100	85	110	42	12	250
WG7132	75	10500	21500	88	320	110	95	125	45	15	280
WG7134	100	16000	28000	98	340	125	95	140	45	15	300
WG7136	130	21500	37000	112	360	130	95	160	45	15	320
WG7138	160	27000	42500	126	380	145	95	180	45	15	340
WG7140	200	31500	48000	140	400	170	95	200	45	15	360
WG7142	300	39000	53000	155	420	175	95	220	45	15	380
WG7145	400	53500	75000	183	450	185	120	260	60	20	400
WG7151	500	91000	118000	210	510	220	125	295	60	20	460
WG7155	600	127000	132000	220	550	240	125	310	60	20	500
WG7158	1000	180000	145000	250	580	260	130	350	60	20	530
WG7165	1500	241000	184000	295	650	315	140	415	65	25	600
WG7166	2100	360000	283000	305	665	330	145	430	65	25	615
WG7168	2600	425000	330000	315	680	350	145	445	65	25	630
WG7171	3400	529000	366000	335	710	380	165	475	81	35	660
WG7178	4200	660000	420000	380	780	410	165	535	81	35	730
WG7185	6200	815000	490000	425	850	450	165	600	81	35	800

Identifier	Size	T_Kmax ft-lbs	F_rad lbs	d_1kmax inch	D inch	L inch	L_min inch	D₁ inch	H₂ inch	F_K inch	C inch
WG7125	25	4794	3933	2.598	9.843	3.740	3.346	3.740	1.654	0.472	8.661
WG7128	50	6196	4495	3.031	11.024	3.937	3.346	4.331	1.654	0.472	9.843
WG7132	75	7744	4832	3.465	12.598	4.331	3.740	4.921	1.772	0.591	11.024
WG7134	100	11801	6292	3.858	13.386	4.921	3.740	5.512	1.772	0.591	11.811
WG7136	130	15858	8315	4.409	14.173	5.118	3.740	6.299	1.772	0.591	12.598
WG7138	160	19914	9551	4.961	14.961	5.709	3.740	7.087	1.772	0.591	13.386
WG7140	200	23233	10787	5.512	15.748	6.693	3.740	7.874	1.772	0.591	14.173
WG7142	300	28765	11911	6.102	16.535	6.890	3.740	8.661	1.772	0.591	14.961
WG7145	400	39460	16855	7.205	17.717	7.283	4.724	10.236	2.362	0.787	15.748
WG7151	500	67119	26518	8.268	20.079	8.661	4.921	11.614	2.362	0.787	18.110
WG7155	600	93671	29665	8.661	21.654	9.449	4.921	12.205	2.362	0.787	19.685
WG7158	1000	132763	32586	9.843	22.835	10.236	5.118	13.780	2.362	0.787	20.866
WG7165	1500	177754	41351	11.614	25.591	12.402	5.512	16.339	2.559	0.984	23.622
WG7166	2100	265525	63599	12.008	26.181	12.992	5.709	16.929	2.559	0.984	24.213
WG7168	2600	313467	74162	12.402	26.772	13.780	5.709	17.520	2.559	0.984	24.803
WG7171	3400	390175	82252	13.189	27.953	14.961	6.496	18.701	3.189	1.378	25.984
WG7178	4200	486796	94387	14.961	30.709	16.142	6.496	21.063	3.189	1.378	28.740
WG7185	6200	601120	110119	16.732	33.465	17.717	6.496	23.622	3.189	1.378	31.496

Images & Drawings

Dimensions

Rigid mounting of gearbox-drum connection

Mounting with barrel coupling

Characteristics

RINGFEDER^® TNK serie TKV

Barrel couplings made of reinforced-material for use in crane/ hoist applications to support the rope drum.

Characteristics

Torsionally rigid, compensate for angular and axial shaft misalignment
Torque transmission by hardened, barrel shaped steel rollers
Equipped with wear indication
Outer diameters up to 850 mm
Bores up to 425 mm
Torques up to TKmax = 815,000 Nm
Maximal radial load Frad = 490,000 N

FEATURES AND APPLICATIONS

The barrel coupling consists of a sleeve, made of reinforced-material, equipped with semi-circular internal teeth and a hub, made of reinforced-material, with semi-circular external teeth of the same shape. In the resulting circular recording hardened steel barrel rollers are used, which serve as power transmission elements. Lock rings on both sides of the barrel rollers serve for their axial guidance. Inner and outer covers, each of which is equipped with a lip seal, effectively prevent foreign matter from entering and lubricant from escaping.

Due to the curved shape of the barrel rollers, it is possible to swing the hub relative to the housing, as a result of which angular alignment errors can be compensated. Depending on the size of the coupling, axial displacements of 3 mm to 8 mm can be accommodated during operation. The torque is transmitted by means of two carrier face on the housing and their counter-carrier face into the drum. The screws, used to connect the drum, support torque transmission.

By using high-strength materials for hub and sleeve, the transmission capability compared to the type TK could be significantly increased.

Barrel couplings are used in material handling technology and especially in crane hoists to connect rope drums to the gear output shaft with minimum axial space. In this application, the barrel coupling transmits high torques and large radial forces and yet acts as a joint. Thus, in a rigid connection of the gear shaft with a lifting drum a three-point bearing (Figure No. 1) and thus a statically indeterminate case would result.

Then a high alignment quality is required. However, unavoidable assembly inaccuracies, deflection of the foundation under load, and wear on the bearing cause enormous additional forces has to be absorbed by the stored gear shaft. Alternating bending stress can cause fatigue failure and bearing and gear damage.

In order to avoid this risk, barrel couplings between the gearbox and the rope drum are positioned, which, due to their characteristics, compensate angular misalignments. With the barrel coupling in a three-point bearings, a statically indeterminate becomes a statically determined drive train, whereby high bending moments and constraining forces are avoided. Figure 3 shows the assembly of a barrel coupling in a hoist. Taking into account that the coupling absorbs displacements and thus acts as a floating bearing, a spherical roller bearing is to be provided as a fixed bearing at the other end of the drum shaft.
Barrel Coupling

In the recommended mounting Fig. 2, the barrel coupling, which is installed between the gearbox and rope drum, performs the function of an articulated joint, thus making the connection statically determinate and avoiding the occurrence of high bending moments.