as the rapid development of China high-precision processing equipment, and the Chinese technology become more sophisticated, more and more CNC rotary table, vertical machining centers, vertical lathes, grinders and other high-precision CNC machining equipment are to abandon traditional design,and are to adopt  better performance cross-roller bearings.
Cross roller bearings, the rolling element is generally cylindrical roller or tapered roller, the rollers are arranged so that they cross between the inner ring and the outer ring., and is maintained between the isolation blocks. The bearing has high rotational accuracy, larger carry capacity, smaller size and higher speed of rotation and higher rigid, with the absolute advantages and more widely applications compared with other bearings.
the criss-cross arrangement of the roller structure makes individual bearing can carry axial load, radial load and overturning moment in all directions. Compared with the traditional structure, the bearing rigidity is 3-4 times of that of traditional bearings. and the size of the bearing is close to the limit of ultra-thin of the structure, and has high rigidity. It is well apply to the joints or rotating parts of industrial robots, the rotation of the machining center, robot rotation parts, precision rotary table, medical equipment and other applications.
Crossed tapered roller bearings with large cone angle and cone geometric design enables the bearing overall effective span to be bigger, while also saving space, saving material costs. Therefore, the cross-tapered roller bearings have a higher overturning moment capacity, higher rotation accuracy and higher limit speed, is the ideal choice for high-speed vertical lathe, vertical boring machine, and vertical grinder.
Structure of crossed roller bearings
Crossed roller bearings have the structure of outer ring division type with inner rotating, inner ring division type with outer rotating, inner Ring Rotation / Outer Ring Rotation. the rolling element is cylindrical roller, cylindrical rollers are arrange crosswise with each roller perpendicular to the adjacent roller in 90V groove, separated from each other by spacer retainer. The criss-cross arrangement of the roller structure makes individual bearing can carry axial load, radial load and overturning moment in all directions. and the size of the bearing is close to the limit of ultra-thin of the structure, and the bearing has high rigidity, higher rotation accuracy and larger carry capacity.  so it is well apply to the joints or rotating parts of industrial robots, the rotation of the machining center, robot rotation parts, precision rotary table, medical equipment and other applications.
RB series(outer ring division type with inner rotating), this type is the basic type of crossed roller bearings. the outer rings have two parts, and the inner ring is one integer. the type is well apply to the situation which need high rotation accuracy on inner ring. for example,it is suitable for the rotary part of the indexing table of the tools machine.

RB series(Outer ring division type,inner rotating)										Unit:mm
TYPE	Dimensions					Shoulder Height		Basic Load Rating(Radial)		Weight
	Inner Ring	Outer Ring	Roller Pitch Diameter	Height	Chamfer			Cr	Cor
	d	D	Dpw	B  B1	Rmin	Ds	Dh	kN	kN	kg
RB3010	30	55	41.5	10	0.6	37	47	7.35	8.36	0.12
RB3510	35	60	46.5	10	0.6	41	51.5	7.64	9.12	0.13
RB4010	40	65	51.5	10	0.6	47.5	57.5	8.33	10.6	0.16
RB4510	45	70	56.5	10	0.6	51	61.5	8.62	11.3	0.17
RB5013	50	80	64	13	0.6	57.4	72	16.7	20.9	0.27
RB6013	60	90	74	13	0.6	68	82	18	24.3	0.3
RB7013	70	100	84	13	0.6	78	92	19.4	27.7	0.35
RB8016	80	120	98	16	0.6	91	111	30.1	42.1	0.7
RB9016	90	130	108	16	1	98	118	31.4	45.3	0.75
RB10016	100	140	119.3	16	1	109	129	31.7	48.6	0.83
RB10020		150	123	20	1	113	133	33.1	50.9	1.45
RB11012	110	135	121.8	12	0.6	117	127	12.5	24.1	0.4
RB11015		145	126.5	15	0.6	122	136	23.7	41.5	0.75
RB11020		160	133	20	1	120	143	34	54	1.56
RB12016	120	150	134.2	16	0.6	127	141	24.2	43.2	0.72
RB12025		180	148.7	25	1.5	133	164	66.9	100	2.62
RB13015	130	160	144.5	15	0.6	137	152	25	46.7	0.72
RB13025		190	158	25	1.5	143	174	69.5	107	2.82
RB14016	140	175	154.8	16	1	147	162	25.9	50.1	1
RB14025		200	168	25	1.5	154	185	74.8	121	2.96
RB15013	150	180	164	13	0.6	157	172	27	53.5	0.68
RB15025		210	178	25	1.5	164	194	76.8	128	3.16
RB15030		230	188	30	1.5	173	211	100	156	5.3
RB16025	160	220	188.6	25	1.5	173	204	81.7	135	3.14
RB17020	170	220	191	20	1.5	184	198	29	62.1	2.21
RB18025	180	240	210	25	1.5	195	225	84	143	3.44
RB19025	190	240	211.9	25	1	202	222	41.7	82.9	2.99
RB20025	200	260	230	25	2	215	245	84.2	157	4
RB20030		280	240	30	2	221	258	114	200	6.7
RB20035		295	247.7	35	2	225	270	151	252	9.6
RB22025	220	280	250.1	25	2	235	265	92.3	171	4.1
RB24025	240	300	269	25	2.5	256	281	68.3	145	4.5
RB25025	250	310	277.5	25	2.5	265	290	69.3	150	5
RB25030		330	287.5	30	2.5	269	306	126	244	8.1
RB25040		355	300.7	40	2.5	275	326	195	348	14.8
RB30025	300	360	328	25	2.5	315	340	76.3	178	5.9
RB30035		395	345	35	2.5	322	368	183	367	13.4
RB30040		405	351.6	40	2.5	326	377	212	409	17.2
RB35020	350	400	373.4	20	2.5	363	383	54.1	143	3.9
RB40035	400	480	440.3	35	2.5	422	459	156	370	14.5
RB40040		510	453.4	40	2.5	428	479	241	531	23.5
RB45025	450	500	474	25	1	464	484	61.7	182	6.6
RB50025	500	550	524.2	25	1	514	534	65.5	201	7.3
RB50040		600	548.8	40	2.5	526	572	239	607	26
RB50050		625	561.6	50	2.5	536	587	267	653	41.7
RB60040	600	700	650	40	3	627	673	264	721	29
RB70045	700	815	753.5	45	3	731	777	281	836	46
RB80070	800	950	868.1	70	4	836	900	468	1330	105
RB90070	900	1050	969	70	4	937	1001	494	1490	120
RB1000110	1000	1250	1114	110	5	1057	1171	1220	3220	360
RB1250110	1250	1500	1365.8	110	5	1308	1423	1350	3970	440