04-80063YuTS-KhD bearings: friction torque several times lower than on the standard grease

JSC OK-LOZA, chief design department · approved by executive director R. B. Volkov; performed by: lead specialist of the chief design department V. E. Kunyaev, lead design engineer E. T. Yaroshenko

Loza, Russia · technical report approved 24.11.2008

PRODUCTXADO «Protective - 60K» grease2-3 mg packed per bearing, on both sides

TEST OBJECTInstrument rolling bearings04-80063YuTS-KhD, batch of 12 pcs · original designation 04-80063YuUTS21

DOCUMENT TYPETechnical report
JSC OK-LOZA

Key result

↓3.5×

batch average friction torque, 2.61 → 0.75 gf·cm

OBJECT	CONDITION AT TEST START	WHAT WAS MEASURED
Bearings 04-80063YuUTS21, 12 pcs	Standard ERA filtered grease, 10-20 mg per drawing	Friction torque, overall vibration acceleration level
The same 12 bearings, designation 04-80063YuTS-KhD	Washed, XADO «Protective - 60K» packed, 1-4 mg	Friction torque, overall vibration acceleration level

Friction torque: the same 12 bearings before and after the grease change

BEARING	STANDARD ERA F GREASE, gf·cm	XADO «PROTECTIVE - 60K» GREASE, gf·cm
No. 750	2.94 / 2.59	0.63
No. 742	2.87 / 2.80	1.1
No. 775	2.87 / 2.59	0.91
No. 744	3.0 / 2.80	0.67
No. 764	2.80 / 2.52	0.98
No. 770	2.94 / 2.70	0.63
No. 707	3.05 / 2.45	1.1
No. 710	2.70 / 2.45	0.56
No. 740	2.90	0.53
No. 729	2.50	0.84
No. 634	1.50	0.67
No. 665	1.20	0.42
Batch average	2.61	0.75

SU17 test rig, n=15000 rpm, axial load A=(0.5+0.1) kgf. Friction torque decreased on all twelve bearings of the batch.

Overall vibration acceleration level across the batch

MEASUREMENT STAGE	GREASE	AVG. VIBRATION LEVEL, m/s²
Before run-in	ERA filtered (standard)	0.33
After 15 min run-in	ERA filtered (standard)	0.30
After first 30 min run-in	XADO «Protective - 60K»	0.35
After second 30 min run-in	XADO «Protective - 60K»	0.38

KZ-13 instrument, axial load A=(0.4+0.1) kgf. All readings for both greases stayed within 0.2-0.6 m/s².

Comparison background: friction torque on standard and imported greases

GREASE	BEARINGS	AVERAGE FRICTION TORQUE, gf·cm
ERA filtered	04-80063YuUT, 10 pcs	2.9
ERA unfiltered	04-80063YuUT, 10 pcs	4.3
Chevron	04-80063YuUT, 3 pcs	4.9

A separate batch of bearings, 8 min run-in; XADO grease was not included in this comparison. On Chevron, two bearings showed unstable friction torque of ±2 gf·cm.

Report conclusions

JSC OK-LOZA recorded in the section «Conclusions and recommendations»: 1. The «Protective - 60K» grease by XADO provides a stable low friction torque of 04-80063YuTS-KhD bearings. 2. The vibration level of bearings with ERA F and «Protective - 60K» greases lies within the range 0.2-0.6 m/s². 3. Send LLC «Medtorg+» a batch of 04-80063YuTS-KhD bearings, 12 pcs, for testing within the products in comparison with the standard bearings. The batch average friction torque thereby decreased from 2.61 to 0.75 gf·cm, and the reduction was obtained on each of the twelve bearings — from 0.42 to 1.1 gf·cm against 1.20-3.05 gf·cm on the standard grease.

The results apply to 04-80063YuTS-KhD instrument rolling bearings and to the bench test modes of JSC OK-LOZA: n=15000 rpm at an axial load of 0.5 kgf; with other sizes and operating modes the figures may differ. The original signed technical report of 24.11.2008 is published in full and available for download.

Current equivalent

Revitalizant gel for compressors and bearings →

Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.

How such units are treated: Bearings

← Full catalogue