Author: L. Dale SmithPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 28
Book Description
Evaluation of Impregnated Lubricants in Ball-bearing Retainers at 106̄ Torr
Author: L. Dale SmithPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 28
Book Description
Evaluation of Impregnated Lubricants in Ball-bearing Retainers at 10
Author: L. Dale SmithPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 19
Book Description
Four liquid lubricants, a polyphenyl ether, a polysiloxane, a sebacate, and a high-viscosity mineral oil, were evaluated as lubricating impregnants in cotton-cloth phenolic retainers of 20-millimeter-bore ball bearings operating in a vacuum of 10-6 torr. The effect of the cloth weave on the lubricating effectiveness of the best of the lubricants was also studied. The test bearings were run at 3550 rpm under axial loads of 50 to 100 pounds (22.7 to 45.4 kg) for 1 hour, or until the torque exceeded and remained above 20 inch-ounces (14.1 cm-N). Although none of the lubricants provided good lubrication in the vacuum environment of this system, the most acceptable lubricant was the mineral oil. It provided the lowest torque levels and torque roughness and carried the maximum load for the full duration of the test. High initial torques occurred frequently with all of the lubricants, which indicated inadequate lubrication during the initial part of the run. Comparing bearing performance obtained with only impregnated retainers to that obtained with both impregnated retainers and prelubrication showed that the impregnated retainers used did not feed the lubricant fast enough to provide good lubrication at the conditions of this investigation. In additional tests with the high-viscosity mineral oil, varying the weave of cloth in the retainer produced no significant improvements in the bearing torque.
Evaluation of Impregnated Lubricants in Ball-bearing Retainers at 10
Author: L. Dale SmithPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 0
Book Description
Four liquid lubricants, a polyphenyl ether, a polysiloxane, a sebacate, and a high-viscosity mineral oil, were evaluated as lubricating impregnants in cotton-cloth phenolic retainers of 20-millimeter-bore ball bearings operating in a vacuum of 10-6 torr. The effect of the cloth weave on the lubricating effectiveness of the best of the lubricants was also studied. The test bearings were run at 3550 rpm under axial loads of 50 to 100 pounds (22.7 to 45.4 kg) for 1 hour, or until the torque exceeded and remained above 20 inch-ounces (14.1 cm-N). Although none of the lubricants provided good lubrication in the vacuum environment of this system, the most acceptable lubricant was the mineral oil. It provided the lowest torque levels and torque roughness and carried the maximum load for the full duration of the test. High initial torques occurred frequently with all of the lubricants, which indicated inadequate lubrication during the initial part of the run. Comparing bearing performance obtained with only impregnated retainers to that obtained with both impregnated retainers and prelubrication showed that the impregnated retainers used did not feed the lubricant fast enough to provide good lubrication at the conditions of this investigation. In additional tests with the high-viscosity mineral oil, varying the weave of cloth in the retainer produced no significant improvements in the bearing torque.
NASA Technical Note
Author: Lubrication, Corrosion and Wear
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information DivisionPublisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 444
Book Description
Scientific and Technical Aerospace Reports
Author: NASA SP.
Author: Oil Exchange Between Ball Bearings and Cotton-phenolic Ball-bearing Retainers
Author: P. A. BertrandPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 25
Book Description
Development of Light Weight Solid Lubricated Bearing Retainers
Author: David J. BoesPublisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
A materials development program was undertaken in an effort to develop a high strength-to-weight ratio self-lubricating composite for use as a solid lubricating retainer in ball bearings operating at speeds up to 60,000 rpm. The program encompassed a termpature range from -40 F to 1000 F. Functional tests using 204 and 205 size bearings were run at speeds up to 30,000 rpm and temperatures to 1000 F. Under these operating conditions, a maximum life of 3-1/2 hours was obtained on a 204 size bearing equipped with a Clevite 300 retainer. Attempts to employ light-weight, Teflon impregnated porous metal composites as self-lubricating retainers in high speed ball bearings were unsuccessful. No further testing of these particular materials is anticipated.
ASME 67-LUB-21
Author: R. J. ParkerPublisher:
ISBN:
Category : Ball-bearings
Languages : en
Pages : 7
Book Description