YRT Series

Features of YRT Series

The internal structure of the crossed roller bearing adopts the rollers arranged in a 90° mutually perpendicular crosswise arrangement.
Spacers or spacers are installed between the rollers to prevent the rollers from observing each other when they are tilted. In addition, there is no square contact phenomenon or locking phenomenon of the roller; at the same time, because the inner and outer ring is a divided structure, the gap can be adjusted, even if preload is applied, high-precision rotational movement can be obtained.

Applications

It is suitable for a wide range of applications such as joint parts or rotating parts of industrial robots, rotating tables of machining centers, manipulator rotating parts, precision rotating tables, medical instruments, measuring instruments, and IC manufacturing equipment.

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Parameter Introduction Quality Standard

Parameter

Nominal model Bearing Type	Dimension									Fixing hole: The fixing holes
	d	D	H	H1	H2	C	d1	dn	dm	Inner ring				外圈Outer ring
	Unit: mm									do	ds	Ts	数量4)	dL	数量4)QTY4)
	Unit: mm									mm			QTY4)	mm	数量4)QTY4)
YRT50	50	126	30	20	10	10	105	63	116	5.6	9	4.2	10	5.6	12
YRT80	80	146	35	23.35	11.65	12	130	92	138	5.6	10	4.2	10	4.6	12
YRT100	100	185	38	25	13	12	160	112	170	5.6	10	5.4	16	5.6	15
YRT120	120	210	40	26	14	12	184	135	195	7	11	6.2	22	7	21
YRT150	150	240	40	26	14	12	214	165	225	7	11	6.2	34	7	33
YRT180	180	280	43	29	14	15	244	194	260	7	11	6.2	46	7	45
YRT200	200	300	45	30	15	15	274	215	285	7	11	6.2	46	7	45
YRT260	260	385	55	36.5	18.5	18	345	280	365	9.3	15	8.2	34	9.3	33
YRT325	325	450	60	40	20	20	415	342	430	9.3	15	8.2	34	9.3	33
YRT395	395	525	65	42.5	22.5	20	486	415	505	9.3	15	8.2	46	9.3	45
YRT460	460	600	70	46	24	22	560	482	580	10	15	8.2	46	10	45
YRT580	580	750	90	60	30	30	700	610	720	11.4	18	11	46	11.4	42
YRT650	650	870	122	78	44	34	800	680	830	14	20	13	45	14	42
YRT850	850	1095	124	80.5	43.5	37	1018	690	1055	18.5	26	17	57	18.5	54
YRT950	950	1200	132	86	46	40	1130	990	1160	18.5	26	17	57	18.5	54
YRT1030	1030	1300	145	92.5	52.5	40	1215	1075	1255	18.5	26	17	66	18.5	66
YRT1200	1200	1490	164	108	56	52	1410	1240	1240	18.5	26	17	66	18.5	66

Introduction of YRT Series

With excellent rotation accuracy
The internal structure of the crossed roller bearing adopts the rollers arranged in a 90° mutually perpendicular crosswise arrangement.
Spacer retainers or spacer blocks are installed between the rollers to prevent the rollers from observing each other when they are tilted. In addition, there is no square contact phenomenon or locking phenomenon of the roller; at the same time, because the inner and outer ring is a divided structure, the gap can be adjusted, even if preload is applied, high-precision rotational movement can be obtained.
Simplified operation and installation
The outer ring or inner ring, which is divided into two parts, is fixed in place after the rollers and cages are installed, so the operation during installation is very simple.
Withstand large axial and radial loads
Because the rollers are arranged perpendicular to each other through spacers on the 90° V-groove rolling surface.
Significantly save installation space
The size of the inner and outer rings of the cross roller bearing is miniaturized to a small limit, especially the ultra-thin structure is a small size close to the limit, and has high rigidity, so it is suitable for the joint or rotating part of industrial robots, and the rotating work of machining centers. It has a wide range of uses such as tables, rotating parts of manipulators, precision rotating tables, medical instruments, measuring instruments, and IC manufacturing equipment.
High speed capability
Reduce shaft length and processing costs, thermal expansion causes limited changes in geometric dimensions
Adopt nylon divider, low moment of inertia, low starting torque, easy to control angle indexing
Optimized pre-tightening force, high rigidity, high precision of guiding roller operation
Carburized steel provides excellent impact resistance and surface abrasion resistance
Simple but well lubricate

Quality Standard

Rockewell Bearings has added parameters that are not defined by ISO/ABEC for customers, including preload tolerances, functional tests, traceability and micron codes, cleanliness, raceway curvature, balls, etc. and roundness, surface processing (function And non-functional surfaces), steel specifications, cage trim and design, and installation chamfering. The definition of these parameters improves the quality of precision angular contact ball bearing products, thereby improving the performance of machine tool spindles.
The element of precision angular contact ball bearings is the cage, which is very important for machine tool bearings. The performance of the cage will affect the stability of machine tool bearings under high-speed rotation. The standard cage produced by Rockewell is made of phenolic resin. The internal design and the tolerance of the pocket gap are tight and the guide surface is controlled to ensure the stability of the cage during high-speed operation, lubrication and dynamic load.
The two elements of precision angular contact ball bearings are cleanliness, which is very important for precision angular contact ball bearings. Generally, the parts of the bearing products must be cleaned with a multi-solvent for 3 hours to prevent impurities from entering the bearing and prevent inherent pollution sources. In addition, the non-working surface of the bearing must be ground to ensure that the bearing is free of impurities before leaving the factory. Therefore, the bearing products produced by Rockewell can increase the normal operating time of the machine tool.
There are two main structural design methods for precision angular contact ball bearings: the high-rigidity WI series and the high-speed HX series to meet the requirements of different applications. The basic, open Rockewell bearing design has a higher spindle speed and greater dynamic radial stiffness, so the spindle can cut more material in a shorter time while ensuring excellent finished product tolerances. These improvements are attributed to the combination of the ball body and the precision engineering design of the raceway profile, which improves the processing rate.

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