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Combined Bearings

Combined bearing, also known as composite roller bearing, was first designed by Europeans. It is a rolling bearing composed of two bearing structures simultaneously. Specifically, the internal structure of this bearing can contain short cylindrical, tapered, or drum-shaped rollers as rolling elements.

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For different application scenarios and working conditions, different types of combined bearings need to be selected, such as crossed cylindrical roller bearings, tapered roller bearings, angular contact ball bearings, etc. At the same time, it is also necessary to operate and maintain in strict accordance with the use specifications of the bearings during use to ensure the long-service stable operation of the bearings and prolong their service life.

Classification of combined bearings

According to the structure and application, it can be further classified into standard crossed roller bearings and high rigidity crossed roller bearings.

Standard-type crossed roller bearing: the outer ring of this bearing is divided into two parts, fixed with screws. It is mainly suitable for the rotating parts of industrial robots, machine tools, and medical equipment that require small size, high rigidity, and high rotation accuracy.

High rigidity type crossed roller bearing: The inner and outer rings of this kind of bearing are all in one structure (non-split), with high precision and high rigidity, and are mainly suitable for industrial robots and machine tools that require small size, high rigidity and high rotational accuracy and rotating parts of medical equipment.

No matter what type of composite roller bearings, they all have open and sealed types. Open bearings do not have internal seals, while sealed bearings have special synthetic rubber seals. These bearings have a wide range of uses and excellent performance within their scope of application, providing stable and reliable support and rotation for various mechanical equipment.

The main constituent materials of Combined bearings include

Shaft head: Heat treatment, together with other parts, generally quenching and tempering, are used to increase hardness.

Main roller: It is the main load-bearing part in the bearing, usually made of high-carbon chromium bearing steel (GCr15), which has high hardness and wear resistance after heat treatment.

Side roller: It is the secondary load-bearing part in the composite roller bearing, usually made of carburized steel (17CrNiMo6), which has high surface hardness and wear resistance after heat treatment.

Cover plate: used to install and fix the main roller, side roller, and shaft head, generally made of medium carbon steel (35CrMo).

In addition, bearing cages are usually made of brass or polymer materials to reduce friction and wear.

Generally, the material selection of a Combined bearing is determined according to its use environment and working conditions to ensure that the bearing has good performance and long life.

The model and parameters of the combined bearing
Fixed Combined Bearings

Fixed combined bearings are particularly suitable to be used in forklift masts and in any other moving and handling system, where rolled or extruded profiles are used. The best combination axial part/radial part allows to get high load capacity with extremely small dimensions of the bearing, in addition to easiness of assembling on any kind of structure.

Model	d	T	D	H	h	B	A	S	r	C	Co	Ca	Coa	Profile
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Profile
400-0053	30	40	52.5	33	27	17	5	15	2	24.8	34.5	9.2	11.7	EC053
400-0054	30	42	62	37.5	30.5	20	2.5	20	3	39	65.2	14.4	21	2890
400-0055	35	48	70.1	44	36	23	2.5	22	4	55.5	91.7	17.6	25	2867
400-0056	40	53	77.7	48	36.5	23	3	24	4	58.4	100	23.2	35.8	2810
400-0058	45	59	88.4	57	44	30	3.5	26	3	83.8	132.3	27.7	42	2811
400-0061	60	71	107.7	69	55	31	4	34	5	94.2	160.7	38.6	65.2	2862
400-0062	60	80	123	72.3	56	37	5	40	5	128	226.8	53	92	2891
400-0063	60	108	149	78.5	58.5	45	5.5	50	3	172.3	325.9	133.3	244	2757
400-0011	60	108	149	86	67	45	5.5	50	3	172.3	325.9	133.3	244	2757
400-0037	80	120	174	95	71	55	7	63	7	265	488	205.3	381	*
400-0039	80	120	185	95	71	55	7	63	7	265	488	205.3	381	*

Adjustable Combined Bearings

Adjustable combined bearings have the same characteristics as fixed combined bearings. The only difference is the possibility to adjust the distance between bearing and profile through the use of washers.

Model	d	T	D	H	h	B	A	S	r	C	Co	Ca	Coa	Profile
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Profile
400-0072	30	42	62	43	33	20	5.5	16	3	39	65.2	5.8	6	2890
400-0073	35	48	70.1	48	40	23	6.5	16	4	55.5	91.7	5.8	6	2867
400-0074	40	53	77.7	51	39.5	23	7	21	4	58.4	100	13.2	14.5	2810
400-0076	45	59	88.4	61	48	30	7	21	3	83.8	132.3	13.2	14.5	2811
400-0078	60	71	107.7	73	59	31	8	33	5	94.2	160.7	25	28	2862
400-0079	60	80	123	75.8	59.5	37	8	33	5	128	226.8	25	28	2891
400-0080	60	103	149	89	69	45	15	50	5	172.3	325.9	83	130	2757

Adjustable Combined Bearings with Eccentric Pin

Adjustable combined bearings with Eccentric Pin have the same characteristics as adjustable combined bearings. In this case, the adjusting of the distance is made through the rotation of the whole axial part (pin and little roll) in the central pivot.

Model	d	T	D	H	B	A	S	r	C	Co	Ca	Coa
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
400-0454	30	42	62	37.5	20	4	20	3	39	65.2	16	25
400-0455	35	48	70.1	44	23	4	20	4	55.5	91.7	16	25
400-0456	40	54	77.7	48	23	3.5	26	4	58.4	100	23	36
400-0458	45	59	88.4	57	30	4	26	4	83.8	132.3	23	36
400-0461	60	69	107.7	69	31	4	30	5	94.2	160.7	32	50
400-0462	60	80	123	72.3	37	4.5	34	5	128	226.8	41	72
400-0463	60	108	149	78.5	45	6	34	3	172.3	325.9	41	72

Adjustable Combined Bearings with Cap

Adjustable combined bearings with cap made in plastic material maintain high resistance to the load applied on them, and at the same time have an easy system of adjusting the distance between profile and bearing, The adjusting is made through the shifting of a screw which is put in the core of the pivot and lays on the cap.

Model	d	T	D	H	h	B	A	S	r	C	Co	Profile
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Profile
400-0562	30	42	62	37.5	30.5	20	2.5	18	3	39	65.2	2890
400-0563	35	48	70.1	44	36	23	2.5	18	4	55.5	91.7	2867
400-0564	40	53	77.7	48	36.5	23	3	18	4	58.4	100	2810
400-0565	45	59	88.4	57	44	30	3.5	18	3	83.8	132.3	2811
400-0566	60	71	107.7	69	55	31	4	25	5	94.2	160.7	2862
400-0567	60	80	123	72.3	56	37	5	40	5	128	226.8	2891
400-0568	60	108	149	78.5	58.5	45	5.5	40	3	172.3	325.9	2757
400-0569	60	108	149	86	67	45	5.5	40	3	172.3	325.9	2757

Adjustable Combined Bearings with Steel Cap

As for the previous series, adjustable combined bearings with steel cap maintain a very high resistance to applied loads, and at the same time, they have an easy system of axial adjusting. Also in this case, the adjusting is made through the shifting of a central screw laid on the cap. In comparison to the adjustable execution with plastic cap, this execution can bear much higher axial loads, and therefore its wear is drfinitely lower.

Combined bearings for high speed

Combined bearings for high speed maintain the same technical characteristics as fixed combined bearings. They are provided with bronze cages both in the radial and in the axial part, therefore they can rotate at a high speed. They are provided also with Viton seals, so that they can bear heavy working conditions and work on high temperatures.

Model	d	T	D	H	h	B	A	S	r	C	Co	Ca	Coa
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	KN	KN	KN	KN
400-0235	45	59	88.9	57	44	30	3.5	26	3	46.6	50	26	32.2
400-0227	60	71	107.7	69	55	31	4	34	5	76	90	30	32
400-0228	60	80	123	72.3	56	37	5	40	5	106	120	42	46
400-0229	60	108	149	86	67	45	5	50	3	129	180	62	70
400-0230	80	120	185	90.5	76	55	7	65	7.5	170	250	80	104

Precision Combined bearings

Precision combined bearings maintain the same characteristics as the previous series. They are manufactured with a wider diameter than the standard ones, because they are used in machined profiles. The very precise coupling between profile and bearing represents a very good and economic solution in comparison to linear guides. These bearings are being used in alternative to the linear guides more often.

Model	d	T	D	H	h	B	A	S	r	C	Co	Ca	Coa	Profile
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	KN	KN	KN	KN	Profile
DR 400-0054	30	42	64.8	37.5	30.5	20	2.5	20	3	39	65.2	14.4	21	EC065L
DR 400-0454	30	42	64.8	37.5	30.5-32	20	4	20	3	39	65.2	16	25	EC065L
DR 400-0055	35	48	73.8	44	36	23	2.5	22	4	55.5	91.7	17.6	25	EC074L
DR 400-0455	35	48	73.8	44	36-37.5	23	4	20	4	55.5	91.7	16	25	EC074L
DR 400-0056	40	54	81.8	48	36.5	23	3	26	4	58.4	100	23.2	35.8	EC082L
DR 400-0456	40	54	81.8	48	37-38.5	23	3.5	26	4	58.4	100	23	36	EC082L
DR 400-0058	45	59	92.8	57	44	30	3.5	26	3	83.8	132.3	27.7	42	EC093L
DR 400-0458	45	59	92.8	57	44-45.5	30	4	26	4	83.8	132.3	23	36	EC093L
DR 400-0061	60	71	111.8	69	55	31	4	34	5	94.2	160.7	38.6	65.2	EC112L
DR 400-0461	60	69	111.8	69	55-57	31	4	30	5	94.2	160.7	32	50	EC112L
DR 400-0062	60	80	127.8	72.3	56	37	5	40	5	128	226.8	53	92	EC128L
DR 400-0462	60	80	127.8	72.3	56-60	37	5	34	5	128	226.8	41	72	EC128L
DR 400-0063	60	103	153.8	78.5	58.5	43	5.5	50	3	172.3	325.9	133.3	244	EC154L
DR 400-0463	60	108	153.8	78.5	58.5-62.5	45	6	34	3	172.3	325.9	41	72	EC154L

Combined bearings welded on plate

Usually, combined bearings are welded on plete. This is an ideal solution because the bearing welded on plate is directly on the structure of the plant, with the big advantage that the assembling and disassembling operations are extremely fast and cheap. The combined bearings on plate can be supplied in the fixed or adjustable execution.

Adjustable combined bearings for heavy industry

Big size adjustable combined bearings can bear very high loads. They are mainly used for masts of fork lifts up to 50TN and in steel industry where they are used as a wheel for rolling mills carrying cars.

Model	d	T	D	H	h	B	A	S	r	C	Co	Ca	Coa
Model	mm	mm	mm	mm	mm	mm	mm	mm	mm	KN	KN	KN	KN
400-0069	70	98	170	109.7	84.7	11.2	2.5	49.7	4	195	361	83	129
400-0087	80	115	185	100	75	15	4	49.7	3	235	440	83	130
400-0019	110	150	220	115	90	13.5	2.5	70	5	367	719	103	230
400-0038	130	184	260	120	95	18.5	4	80	5	475	1000	167	279
400-0274	150	187	260	135	110	10	3	80	5	566	1300	167	279
400-0088	140	190	300	140	110	10	3.5	86	8	549	1272	195	335
400-0278	140	240	315	240	120	10	3.5	100	8	785	1690	227	392
400-0084	140	240	340	150	120	10	4	100	8	785	1690	227	392
400-0275	170	242	390	200	150	11	4	100	8	1076	2535	227	392

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