NU22 /NU23 Series

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Cylindrical roller bearings

Cylindrical rollers and raceways are line contact bearings. Large load capacity, mainly to bear radial load. The friction between the rolling body and the retaining edge of the ferrule is small, and it is suitable for high-speed rotation. According to the ring with or without ribs, it can be divided into NU, NJ, NUP, N, NF and other single-row cylindrical roller bearings, and NNU, NN and other double-row cylindrical roller bearings. The bearing is a structure in which the inner ring and the outer ring can be separated. The inner ring or outer ring of cylindrical roller bearings without rib, the inner ring and outer ring can make relative movement to the axial direction, so it can be used as a free end bearing. A cylindrical roller bearing with a double rib on one side of the inner ring and the outer ring, and a single rib on the other side of the ring, can withstand a certain degree of axial load in one direction. Generally use steel plate stamping cage, or copper alloy car solid cage. But there is also a part of the use of polyamide forming cage.

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Single row cylindrical roller bearing

N, NU type

The outer ring of the N-type bearing has no rib, and the two sides of the inner ring have ribs. Displacement between the shaft relative to the bearing housing may be permitted in both axial directions. NU type bearing outer ring has ribs on both sides, and the inner ring has no ribs. It is also possible to allow a displacement between the shaft relative to the bearing seat in both axial directions. Therefore, this type of structure is suitable for use as a free-running end bearing.

NJ, NF type

There are ribs on both sides of the outer ring of NJ type bearing, and there are ribs on one side of the inner ring. Can withstand a certain amount of unidirectional axial load. The outer ring of NF type has a rib on one side and a rib on both sides of the inner ring. It can also bear a certain amount of unidirectional axial load. Therefore, this type of structure is suitable for use as a unidirectional axial positioning bearing.

NUP、NFP type

The NUP type bearing has a rib on both sides of the outer ring, one side of the inner ring with a (fixed) single rib, and the other side is a detachable flat retaining ring. Can withstand a certain amount of two-way axial load.

Type NFP bearings have a (fixed) single rib on one side of the outer ring and a detachable flat ring on the other side, with ribs on both sides of the inner ring. It can also bear a certain amount of bidirectional axial load. This kind of structure bearing can limit the displacement of the shaft relative to the bearing seat in the axial direction. Therefore, it is suitable for use as a fixed end bearing.

NH（NJ HJ）type

NH type bearing is a combination of NJ type bearing and HJ type inclined retaining ring. Because the inner ring of the NUP type bearing is short, and the flat retaining ring is not fixed, it is inconvenient to use, and the NH type bearing can use the width of the entire inner ring of the NJ type bearing to maintain a closer fit with the shaft. Moreover, NH type bearings are more convenient to install and disassemble.

The NH bearing can limit the displacement of the shaft relative to the bearing seat in both axial directions. Therefore, it is suitable for use as a fixed end bearing.

double row bearing

double row cylindrical roller bearing

Double row cylindrical roller bearings have cylindrical bore and conical bore (bearing rear code plus K) two structures. This type of bearing has the advantages of compact structure, high rigidity, large carrying capacity, and small deformation after being loaded. It is especially suitable for machine tool spindle support. The conical inner hole can also play the role of micro-adjustment clearance, and can simplify the structure of the positioning device, easy to install and disassemble. Commonly used double row cylindrical roller bearings have the following forms:

NN、NNU type

The outer ring of NN type bearing has no rib, and there is a middle rib in the middle on both sides of the inner ring. Displacement in two directions in the axial direction between the shaft and the bearing seat can be allowed.

The outer ring of NNU-type bearing has ribs on both sides and a middle rib in the middle, and the inner ring has no ribs. Displacement in two directions in the axial direction between the shaft and the bearing seat can be allowed. Therefore, this type of structure is suitable for a free-running end bearing. The cage of this type of bearing is mostly made of solid cage.

NNF type

NNF type bearing is a double row full complement cylindrical roller bearing, bearing by a belt in the rib outer ring, two double rib inner ring structure type. The roller is guided by the rib of the inner ring, and the two inner rings are fixed together with a fastening ring. The structure can not only bear large radial load and axial load, but also can bear overturning moment, so it is often used as a fixed end bearing.

Type NNF bearings use contact seals on both sides. The bearing is filled with grease, and the working temperature of the grease is -50 ℃ to 110 ℃, but due to the limitation of the sealing material, the working temperature of the bearing is limited to -40 ℃ to 80 ℃. In the case of good operating conditions, the sealed NNF bearing does not need to be maintained. If the bearing is in a water vapor or polluted environment for a long time, and it is running at medium or high speed, the lubricating oil groove and lubricating oil hole on the outer ring can be used. The bearing is lubricated.

Single Row (NU22 Series)
Main dimensions (mm)					Rated load (kN)		Permissible speed (rpm)		Weight (Kg)	Model
d	D	B	rs min	r1s min	Cr	Cor	grease lubrication	oil lubrication
20	47	18	1	0.6	30.5	28.3	14,000	16,000	0.158	NU2204E
25	52	18	1	0.6	35.0	34.5	11,000	13,000	0.186	NU2205E
30	62	20	1	0.6	49.0	50.0	9,700	11,000	0.297	NU2206E
35	72	23	1.1	0.6	61.5	65.5	8,500	10,000	0.455	NU2207E
40	80	23	1.1	1.1	58.0	62.0	8,500	10,000	0.49	NU2208
40	80	23	1.1	1.1	72.5	77.5	7,600	8,900	0.552	NU2208E
45	85	23	1.1	1.1	61.5	68.0	7,600	9,000	0.53	NU2209
45	85	23	1.1	1.1	76.0	84.5	6,800	8,000	0.6	NU2209E
50	90	23	1.1	1.1	64.0	73.5	6,900	8,100	0.571	NU2210
50	90	23	1.1	1.1	79.5	91.5	6,200	7,300	0.652	NU2210E
55	100	25	1.5	1.1	75.5	87.0	6,300	7,400	0.773	NU2211
55	100	25	1.5	1.1	97.0	114	5,600	6,600	0.968	NU2211E
60	110	28	1.5	1.5	96.0	116	5,800	6,800	1.06	NU2212
60	110	28	1.5	1.5	131	157	5,200	6,100	1.21	NU2212E
65	120	31	1.5	1.5	120	149	5,400	6,300	1.4	NU2213
65	120	31	1.5	1.5	149	181	4,800	5,600	1.6	NU2213E
70	125	31	1.5	1.5	119	151	5,000	5,900	1.47	NU2214
70	125	31	1.5	1.5	156	194	4,500	5,200	1.7	NU2214E
75	130	31	1.5	1.5	130	162	4,700	5,500	1.55	NU2215
75	130	31	1.5	1.5	162	207	4,200	4,900	1.79	NU2215E
80	140	33	2	2	147	186	4,400	5,100	1.93	NU2216
80	140	33	2	2	186	234	3,900	4,600	2.21	NU2216E
85	150	36	2	2	170	218	4,100	4,800	2.44	NU2217
85	150	36	2	2	217	279	3,700	4,300	2.68	NU2217E
90	160	40	2	2	197	248	3,900	4,600	3.1	NU2218
90	160	40	2	2	242	315	3,500	4,100	3.33	NU2218E
95	170	43	2.1	2.1	230	298	3,600	4,300	3.79	NU2219
95	170	43	2.1	2.1	286	370	3,300	3,800	4.14	NU2219E
100	180	46	2.1	2.1	258	340	3,500	4,100	4.57	NU2220
100	180	46	2.1	2.1	335	445	3,100	3,600	5.01	NU2220E
110	200	53	2.1	2.1	320	415	3,100	3,700	6.56	NU2222
110	200	53	2.1	2.1	385	515	2,800	3,300	7.4	NU2222E
120	215	58	2.1	2.1	350	460	2,900	3,400	8.19	NU2224
120	215	58	2.1	2.1	450	620	2,600	3,000	9.18	NU2224E
130	230	64	3	3	380	530	2,600	3,100	10.2	NU2226
130	230	64	3	3	530	735	2,300	2,700	11.8	NU2226E
140	250	68	3	3	445	635	2,400	2,800	12.9	NU2228
140	250	68	3	3	575	835	2,100	2,500	15.8	NU2228E
150	270	73	3	3	500	710	2.200	2,600	17	NU2230
150	270	73	3	3	530	772	1700	2200	16.3	NU2230E

Single Row (NU23 Series)
Main dimensions (mm)					Rated load (kN)		Permissible speed (rpm)		Weight (Kg)	Model
d	D	B	rs min	r1s min	Cr	Cor	grease lubrication	oil lubrication
20	52	21	1.1	0.6	42.0	39.0	12,000	14,000	0.242	NU2304E
25	62	24	1.1	1.1	57.0	56.0	9,700	11,000	0.386	NU2305E
30	72	27	1.1	1.1	74.5	77.5	8,300	9,700	0.58	NU2306E
35	80	31	1.5	1.1	99.0	109	7,200	8,500	0.78	NU2307E
40	90	33	1.5	1.5	82.5	88.0	7,000	8,200	0.951	NU2308
40	90	33	1.5	1.5	114	122	6,400	7,500	1.06	NU2308E
45	100	36	1.5	1.5	99.0	104	6,300	7,400	1.27	NU2309
45	100	36	1.5	1.5	137	153	5,700	6,800	1.41	NU2309E
50	110	40	2	2	121	131	5,700	6,700	1.7	NU2310
50	110	40	2	2	163	182	5,200	6,100	1.9	NU2310E
55	120	43	2	2	148	162	5,200	6,100	2.17	NU2311
55	120	43	2	2	201	233	4,700	5,600	2.37	NU2311E
60	130	46	2.1	2.1	169	188	4,800	5,700	2.71	NU2312
60	130	46	2.1	2.1	222	262	4,400	5,200	2.96	NU2312E
65	140	48	2.1	2.1	188	212	4,400	5,200	3.27	NU2313
65	140	48	2.1	2.1	248	287	4,100	4,800	3.48	NU2313E
70	150	51	2.1	2.1	223	262	4,100	4,800	3.98	NU2314
70	150	51	2.1	2.1	274	325	3,800	4,400	4.25	NU2314E
75	160	55	2.1	2.1	258	300	3,800	4,500	4.87	NU2315
75	160	55	2.1	2.1	330	395	3,500	4,100	5.25	NU2315E
80	170	58	2.1	2.1	274	330	3,600	4,200	5.79	NU2316
80	170	58	2.1	2.1	355	430	3,300	3,900	6.25	NU2316E
85	180	60	3	3	315	380	3,400	4,000	6.7	NU2317
85	180	60	3	3	395	485	3,100	3,700	7.16	NU2317E
90	190	64	3	3	325	395	3,200	3,800	7.95	NU2318
90	190	64	3	3	435	535	2,900	3,400	8.56	NU2318E
95	200	67	3	3	370	460	3,000	3,500	9.2	NU2319
95	200	67	3	3	460	585	2,700	3,200	9.8	NU2319E
100	215	73	3	3	410	505	2,900	3,400	11.7	NU2320
100	215	73	3	3	570	715	2,600	3,100	12.8	NU2320E
110	240	80	3	3	605	790	2,600	3,100	17.1	NU2322
110	240	80	3	3	675	880	2,400	2,800	19.4	NU2322E
120	260	86	3	3	710	920	2,400	2,800	21.5	NU2324
120	260	86	3	3	795	1,030	2,200	2,500	26.1	NU2324E
130	280	93	4	4	840	1,130	2,200	2,600	26.9	NU2326
130	280	93	4	4	920	1,230	2,000	2,300	30.9	NU2326E
140	300	102	4	4	920	1,250	2,000	2,300	33.8	NU2328
140	300	102	4	4	1,020	1,380	1,800	2,100	38.7	NU2328E
150	320	108	4	4	1,020	1,400	1,900	2,200	40.6	NU2330
150	320	108	4	4	1,160	1,600	1,700	2,000	47.2	NU2330E

Cylindrical roller bearings