Along with significant advantages, bearings with self-aligning thrust pads on a mechanical support and bearings with an alignment system have many disadvantages, such as the lack of damping of axial vibrations, axial subsidence of the supports under the action of axial forces, axial subsidence from mechanical wear of the supports of the bearing elements.

To solve these problems, the company “TRIZ” has developed thrust damper bearing PUD TRIZ with fluid pivot using the hydrodynamic pressure of the oil wedge to form a liquid (hydrostatic) support of the bearing pads. Such a bearing has the main advantages of thrust bearings with self-aligning pads and bearings with a compensating alignment system. These advantages are realized due to the flow of a part of the lubricant from the hydrodynamic wedge into the cavity on the back side of the thrust pad (surfaces of the housing), which ensures the formation of a hydrostatic pressure buffer on the back side of the pad. Thanks to this, the pad floats and is installed in space in such a way, until the balance of forces and moments occurs for the given mode of operation (similar to a pad with a mechanical support).

Thrust damper bearing allows you to eliminate the phenomenon of axial force subsidence of the node, eliminate mechanical supports from the bearing structure, thereby eliminating additional axial subsidence when the bearing surfaces in contact are crushed, and also reduce the axial dimension of the node. The formation of a hydrostatic layer of lubricant on the rear side of the pad will provide the bearing with additional noise suppression and damping, which will reduce axial vibration and rotor rocking.

The thrust damper bearing – PUD

To ensure more stable operation of the rotor, under the condition of uneven load on the bearing elements, the company “TRIZ” has developed a thrust bearing with a spherical abutment (PUDS) of the bearing ring on the bearing housing through hydrostatic support – PUDS TRIZ with a liquid support.

Between the spherical surfaces of the thrust ring and the housing, lubricant is supplied from the cavity (pocket) on the back side of each pad. When the bearing receives an axial load, part of the lubricant from the hydrodynamic wedge flows through the hydrostatic pocket of the pad into the annular groove on the spherical surface of the thrust ring. A hydrostatic pressure circuit is formed between the spherical surfaces, which allows the spherical surface of the thrust ring to float on the layer of lubricant and settle (turn) in the desired position under the influence of an uneven load on the pads. This design allows for an even greater reduction of noise and damping, and also has the ability to equalize the load between the load-bearing pads, which has no analogues.

The thrust damper bearing PUDS – with fluid pivot and a spherical abutment

Thrust bearing with alignment on a spherical surface
(after bench tests)

ADVANTAGES OF BEARINGS WITH LIQUID SUPPORT:

• -high leveling and compensating ability;

• -provision of double bearing capacity;

• -ensuring highly efficient leveling of the load on the load-bearing elements;

• -minimization of axial subsidence from the influence of axial forces;

• -absence of axial subsidence from mechanical wear of supports of bearing elements;

• -redistribution of the force on the bearing blocks in case of uneven axial load;

• -long service life, guaranteed six-year mileage;

• -reducing the number of parts;

• -built-in electroerosive destruction protector;

• -scrapers provide supply, removal and removal of oil;

• -TRIZ tangential and radial cooling is used in the pads;

• -low power losses;

• -compact;

• -adhesion of the anti-friction layer with the substrate is 30% higher;

• -a standard lubrication system is used;

• -ease of maintenance.

Comparison of the number of elements:
a) thrust bearing on a liquid basis; b) thrust bearing with an alignment system

Bench tests of thrust bearings on a liquid basis showed effective damping in modes of increased vibration with high axial load.

Bearing test mode

STANDARDIZED SERIES OF THRUST DAMPING NON-REVERSIBLE BEARING

BEARING ROW WITH SIX PADS

№	Outer Diameter, Do, mm	Inner Diameter, Di, mm	Bearing Working Surface Area Sb, mm2	Bearing Load Capacity N, N	Maximum Rotational Speed, rpm
601	83	39	3458	3458	44000
602	91	42	4184	16900	39000
603	100	47	5063	19800	34200
604	110	51	6126	24500	30300
605	121	56	7412	29800	26700
606	134	62	8969	35500	35500
607	147	68	10852	44000	20600
608	162	75	13131	13131	18100
609	178	83	15889	63500	15950
610	195	91	19225	76000	14100
611	215	100	23276	93000	12400
612	237	110	28148	112000	10900
613	260	121	34059	136000	9600
614	286	133	41211	165000	8450
615	315	146	49865	201000	7450
616	346	161	60337	241000	6550
617	381	177	73007	293000	5780
618	419	195	88339	354000	5090
619	461	214	106890	430000	4490

BEARING ROW WITH EIGHT PADS

№	Outer Diameter, Do, mm	Inner Diameter, Di, mm	Bearing Working Surface Area Sb, mm2	Bearing Load Capacity N, N	Maximum Rotational Speed, rpm
801	83	49	2761	10900	343000
802	91	53	3340	13600	39300
803	100	59	4042	15800	34500
804	110	65	4891	19000	30300
805	121	71	5918	23400	26800
806	134	78	7161	29500	23500
807	147	86	8664	35000	20700
808	162	95	10484	42300	18200
809	178	104	12686	51500	16100
810	196	114	15350	63300	14150
811	215	126	18496	74500	12500
812	237	138	22473	92000	11000
813	260	152	22473	110000	9700
814	286	167	32903	133000	8550
815	315	184	39813	133000	7500
816	347	203	48173	195000	6600
817	381	223	58290	234000	5800
818	419	245	70531	285000	5150
819	461	270	85342	343000	4500

BEARING ROW WITH TEN PADS

№	Outer Diameter, Do, mm	Inner Diameter, Di, mm	Bearing Working Surface Area Sb, mm2	Bearing Load Capacity N, N	Maximum Rotational Speed, rpm
1001	83	56	2185	8550	45400
1002	91	61	2644	10550	40200
1003	100	67	3199	10550	35500
1004	110	74	3871	15200	31200
1005	121	81	4684	18800	27500
1006	134	89	5667	23800	24100
1007	147	98	6858	28200	21300
1008	162	108	8298	34200	18700
1009	178	119	10040	41000	16500
1010	195	131	12148	48000	14500
1011	215	144	14694	59000	12800
1012	237	158	17787	73500	11250
1013	260	174	21522	87000	9940
1014	286	192	26041	10400	8740
1015	315	211	31510	127000	7700
1016	346	232	38127	153000	6780
1017	381	255	46134	186000	5960
1018	419	281	46134	224000	5250
1019	461	309	67545	224000	4630

BEARING ROW WITH TWELVE PADS

№	Outer Diameter, Do, mm	Inner Diameter, Di, mm	Bearing Working Surface Area Sb, mm2	Bearing Load Capacity N, N	Maximum Rotational Speed, rpm
1201	83	61	1722	6800	46900
1202	91	67	2083	8100	41400
1203	100	74	2520	9500	36400
1204	110	81	3050	11800	32100
1205	121	89	3050	14400	28300
1206	134	98	4465	18200	24800
1207	147	108	5403	21400	21900
1208	162	119	6538	26000	19200
1209	178	131	7910	31000	16900
1210	195	144	9572	36500	14950
1211	215	158	11568	45600	13150
1212	237	174	14014	56000	11580
1213	260	191	16957	67000	10200
1214	286	210	20518	81000	9000
1215	315	231	24826	99000	7900
1216	346	254	30040	119000	6980
1217	381	280	36348	144000	6150
1218	419	308	36348	173000	5400
1219	461	339	53217	209000	4760

The bearing can be custom-designed according to the specified mounting dimensions and may differ from the standard numbers in the tables. To request this, an inquiry should be sent to the marketing department.
If needed, a reversible bearing can be offered, whose load capacity is approximately 50% lower than that of a non-reversible bearing from the tables.