Locking Assemblies RfN 7012.2 for Bending Loads

The new Locking Assembly series RINGFEDER^® RfN 7012.2 is specially designed to fulfil the requirements of constantly increasing bending moments for conveyor pulleys.

The challenge was to develop a product with the same dimensions as the standard RINGFEDER^® RfN 7012 to fit into existing end discs – Attention: yield point of end disc has to be checked – so that also material handling equipment at hand can be upgraded. At the same time the Locking Assembly should carry a multiple of the bending moments of the standard RINGFEDER^® RfN 7012.

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Technical Data & CAD Models

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d mm	D mm	L mm	L₁ mm	T_Ared Nm	T Nm	F_ax kN	p_W N/mm²	M_bmax Nm	p_Wmaxbei M_bmax N/mm²	p_Nmaxbei M_bmax N/mm²	T_res bei M_bmax Nm
130	180	52	38	125	19455	299	180	16400	359	259	10467
140	190	52	38	125	25246	361	201	9700	299	221	23308
150	200	52	38	125	26933	359	187	14690	326	244	22574
160	210	52	38	125	31101	389	190	13380	308	235	28075
170	225	60	44	190	36243	426	175	28080	350	265	22914
180	235	60	44	190	41880	465	180	28860	350	268	30348
190	250	68	52	190	51719	544	165	37000	312	237	36137
200	260	68	52	190	56277	563	162	40180	314	241	39404
220	285	74	56	295	74592	678	164	50440	313	241	54952
240	305	74	56	295	84169	701	155	57100	310	244	61838
260	325	74	56	295	104686	805	164	48910	287	229	92558
280	355	86,5	66	405	131586	940	148	89170	297	234	96766
300	375	86,5	66	405	145219	968	143	91850	285	228	112482
320	405	100,5	78	580	201713	1261	145	139400	290	229	145793
340	425	100,5	78	580	220626	1298	141	143500	281	225	167582
360	455	116	90	780	293404	1630	143	178400	267	211	232936
380	475	116	90	780	318305	1675	139	204700	274	219	243754
400	495	116	90	780	344106	1721	136	217320	272	220	266798
420	515	116	90	780	391995	1867	140	195820	257	210	339580
440	545	130	102	1000	478752	2176	137	251950	248	200	407093
460	565	130	102	1000	512615	2229	134	283500	254	206	427085
480	585	130	102	1000	547520	2281	131	315100	259	212	447762
500	605	130	102	1000	598054	2392	132	304200	250	207	514908
520	630	130	102	1000	635586	2445	130	345050	259	214	533770
540	650	130	102	1000	674155	2497	128	355400	256	212	572866
560	670	130	102	1000	729980	2607	129	365700	255	213	631770
580	690	130	102	1000	787923	2717	129	354800	248	209	703519
600	710	130	102	1000	830673	2769	128	386400	253	213	735331
620	730	130	102	1000	874450	2821	126	401500	251	214	776828
640	750	130	102	1000	956024	2988	129	364600	240	204	883770
660	770	130	102	1000	1021852	3097	130	353700	234	200	958686
680	790	130	102	1000	1050855	3091	126	357760	228	196	988081
700	810	130	102	1000	1079804	3085	122	357770	221	191	1018812
720	830	130	102	1000	1108702	3080	118	354670	214	185	1050443
740	850	130	102	1000	1179681	3188	119	367670	215	188	1120922
760	870	130	102	1000	1252745	3297	120	379250	217	189	1193960
780	890	130	102	1000	1305758	3348	119	385650	215	188	1247509
800	910	130	102	1000	1359784	3399	117	392150	213	187	1302011

d inch	D inch	L inch	L₁ inch	T_Ared ft-lbs	T ft-lbs	F_ax lbs	p_W psi	M_bmax ft-lbs	p_Wmaxbei M_bmax psi	p_Nmaxbei M_bmax psi	T_res bei M_bmax ft-lbs
5.118	7.087	2.047	1.496	92	14349	66711	26087	12096	52029	37536	7720
5.512	7.480	2.047	1.496	92	18620	81156	29174	7154	43398	32077	17191
5.906	7.874	2.047	1.496	92	19865	80098	27101	10835	47246	35362	16650
6.299	8.268	2.047	1.496	92	22939	86792	27536	9869	44638	34058	20707
6.693	8.858	2.362	1.732	140	26732	95047	25362	20711	50725	38406	16901
7.087	9.252	2.362	1.732	140	30890	103748	26087	21286	50725	38841	22384
7.480	9.843	2.677	2.047	140	38146	121374	23913	27290	45217	34348	26654
7.874	10.236	2.677	2.047	140	41508	125614	23478	29636	45507	34928	29063
8.661	11.220	2.913	2.205	218	55017	151272	23768	37203	45362	34928	40531
9.449	12.008	2.913	2.205	218	62081	156403	22464	42115	44928	35362	45610
10.236	12.795	2.913	2.205	218	77213	179607	23768	36075	41594	33188	68268
11.024	13.976	3.406	2.598	299	97054	209728	21449	65769	43043	33913	71372
11.811	14.764	3.406	2.598	299	107109	215975	20725	67746	41304	33043	82964
12.598	15.945	3.957	3.071	428	148778	281348	21014	102818	42029	33188	107533
13.386	16.732	3.957	3.071	428	162728	289603	20435	105842	40725	32609	123604
14.173	17.913	4.567	3.543	575	216407	363677	20725	131583	38696	30580	171807
14.961	18.701	4.567	3.543	575	234773	373717	20145	150981	39710	31739	179786
15.748	19.488	4.567	3.543	575	253803	383980	19710	160289	39420	31884	196783
16.535	20.276	4.567	3.543	575	289125	416555	20290	144431	37246	30435	250465
17.323	21.457	5.118	4.016	738	353114	485498	19855	185831	35942	28986	300260
18.110	22.244	5.118	4.016	738	378090	497323	19420	209102	36812	29855	315006
18.898	23.031	5.118	4.016	738	403835	508925	18986	232409	37536	30725	330257
19.685	23.819	5.118	4.016	738	441108	533690	19130	224369	36232	30000	379782
20.472	24.803	5.118	4.016	738	468790	545515	18841	254499	37536	31014	393694
21.260	25.591	5.118	4.016	738	497238	557117	18551	262133	37101	30725	422530
22.047	26.378	5.118	4.016	738	538413	581660	18696	269730	36957	30870	465976
22.835	27.165	5.118	4.016	738	581150	606203	18696	261691	35942	30290	518896
23.622	27.953	5.118	4.016	738	612681	617805	18551	284998	36667	30870	542359
24.409	28.740	5.118	4.016	738	644970	629407	18261	296135	36377	31014	572967
25.197	29.528	5.118	4.016	738	705136	666667	18696	268919	34783	29565	651844
25.984	30.315	5.118	4.016	738	753689	690986	18841	260879	33913	28986	707100
26.772	31.102	5.118	4.016	738	775081	689647	18261	263874	33043	28406	728781
27.559	31.890	5.118	4.016	738	796433	688309	17681	263881	32029	27681	751447
28.346	32.677	5.118	4.016	738	817747	687193	17101	261595	31014	26812	774777
29.134	33.465	5.118	4.016	738	870100	711290	17246	271183	31159	27246	826761
29.921	34.252	5.118	4.016	738	923990	735609	17391	279724	31449	27391	880631
30.709	35.039	5.118	4.016	738	963090	746988	17246	284445	31159	27246	920128
31.496	35.827	5.118	4.016	738	1002938	758367	16957	289239	30870	27101	960327

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Product Characteristics

NEW

The new Locking Assembly series RINGFEDER^® RfN 7012.2 is specially designed to fulfil the requirements of constantly increasing bending moments for conveyor pulleys.
The challenge was to develop a product with the same dimensions as the standard RINGFEDER^® RfN 7012 to fit into existing end discs – yield point of end disc has to be checked – so that also material handling equipment at hand can be upgraded. At the same time the Locking Assembly should carry a multiple of the bending moments of the standard RINGFEDER^® RfN 7012.
To comply with these requirements, we have collected the experiences of our customers and our knowledges of supplying to the market of heavy industry for more than 90 years. The result is the brand new RINGFEDER^® RfN 7012.2.
A special bolt for type RfN 7012.2 has been developed by RINGFEDER^® for the increased requirements occurring when subject to loading by bending moments. These special bolts guarantee loadings above strength class 12.9 at simultaneous higher expansion with regard to tensile strength and yield strength. These bolts were manufactured specially for RINGFEDER^® with qualified steel analysis. Every bolt is labelled with RPT-B and the batch number. This allows every bolt to be traced back to manufacture. The benefit of this bolt is the considerably increased fracture resistance under additional bending stress.

Explanation to table

A bending moment, created by radial forces, results in an additional load for the Locking Assembly, shaft and hub. This load creates an additional pressure, works in rotation and has to be superpositioned with the pressure resulting from the Locking Assembly. For a viable connection, a minimum surface pressure at the contact areas between Locking Assembly, shaft and hub must be maintained, as soon as shaft and hub have to take up the maximal pressures. Additionally, the listed torque values (T) have been reduced due to the additional bending moments. To achieve lower stresses for the Locking Assemblies the screw tightening torques (T_A) have also been reduced.

RINGFEDER® Locking Assemblies – How to Use Them?

Downloads

Product Paper RINGFEDER® Locking Assemblies Bending Loads

Tech Paper Locking Assemblies Bending Loads RINGFEDER® RfN 7012.2

Instruction Manual Locking Assemblies RINGFEDER® RfN 7012, RfN 7012.2

If indicated pressures are too high for your specific application, please refer to the corresponding Tech Papers with reduced bending loads (M_b 20% to M_b 80%).

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