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Thin Section Ball Bearings for Gimbal Applications

Thin Section Ball Bearings for Gimbal Applications
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Thin Section Ball Bearings for Gimbal Applications - 1

unique design solutions to complex problems. The Global Leader in Gimbal Bearings

Thin Section Ball Bearings for Gimbal Applications - 2

LOAD CONDITION Bearing Type Ball Contact Combined Radial, Axial, & Moment (Radial Contact) (Angular Contact) SuperDuplex™ Back-to-Back SuperDuplex™ Face-to-Face

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Thin Section Ball Bearings for Gimbal Applications - 3

General Features and Technical Specifications Integral Shields Silicon Nitride Load Balls (Si3N4) Optional shields are machined integral to the bearing outer ring to provide superior shielding. In addition, they provide enhanced free-state bearing stiffness. Eliminates thin dense chrome plating while providing corrosion resistance protection and maintaining the precision, tolerance, and finish. Spacer balls are smaller than load balls by 0.5-1%. In pre-loaded bearings, other separator options may generate particle shedding – resulting in erratic torque fluctuations. Si3N4 balls promote a...

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Thin Section Ball Bearings for Gimbal Applications - 4

RBC Aerospace Applications THERMAL-COMP ™ Bearings THERMAL-COMP™ bearings are custom designed to compensate for adverse effects of temperature extremes on bearing performance in airborne applications. THERMAL-COMP™ bearings have a double-split ring design. Once properly installed in the bearing support structure at ambient temperature, they will maintain steady and predictable stiffness and torque characteristics throughout a temperature range, regardless of differences in coefficient of thermal expansion (CTE) of the bearing and the support structure materials. Such undesirable variations...

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Thin Section Ball Bearings for Gimbal Applications - 5

Elastomer Molded Seals vs. PTFE/SS300 Seals Many molded seals used in bearings are made out of nitrile material (Buna-N rubber per MIL-R-6855). The material has a relatively high coefficient of friction. In order to meet low torque bearing requirements, seal fit-up during installation must be adjusted to minimize contact pressure on the sealing surfaces - reducing torque by reducing sealing effectiveness. The inherent variability in the seal molding process can further aggravate these issues. Over time, torque fluctuations are nearly inevitable, since seals may reset or the amount of lube...

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Thin Section Ball Bearings for Gimbal Applications - 6

Simplex™ Bearing Series - SuperDuplex™ (DB) Sealed Bearings • SuperDuplex™ back-to-back • 440C stainless steel rings • Si3N4 ceramic load balls • Low torque PTFE seals The alphanumeric identification system is used under license.

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Thin Section Ball Bearings for Gimbal Applications - 7

*Radial load rating is two times the value per row ideally if both rows share load equally.

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Thin Section Ball Bearings for Gimbal Applications - 8

OPERATING CONDITIONSS Lubrication The k values shown give the maximum speeds at which a typical thin section ball bearing can operate. It is recommended that operating speeds of large diameter bearings in a given series be reduced up to 40% of the calculated rating to avoid high bearing temperatures. Speed ratings can also be impacted by load conditions, lubrication, alignment, and ambient temperature. All of these factors must be considered when designing thin section ball bearings into your application. Lubricants serve a number of very important purposes in ball bearings, including: •...

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Thin Section Ball Bearings for Gimbal Applications - 9

Radial Play Radial play (diametral clearance) is the distance the inner ring can be moved radially from one extreme position to the other. Standard RBC thin section ball bearings are manufactured with enough radial play that some clearance remains after the bearing is properly installed. RADIAL PLAY • Heavy radial loads • Combined radial and thrust loads • Reversing thrust loads • Moment loads When there is negative radial play (diametral pre-load) there is interference rather than clearance between the balls and the races. As the interference increases, the friction, stiffness, and torque...

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Thin Section Ball Bearings for Gimbal Applications - 10

** Sealed bearings A Bearings in stock ✓ Bearings with limited availability All other bearings check availability.

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Thin Section Ball Bearings for Gimbal Applications - 11

Engineering Application Data For assistance in selecting the correct bearings for your design, complete this form and fax or mail it to: Industrial Tectonics Division Company Name:_Date: Street Address: _ City:_ State:_ Zip Code:_ Rotational_ rpm Inner Ring Rotating Oscillatory_cpm LZI Outer Ring Rotating Average running_min_max_ d Shock CH Vibration EH Safety factor (Please specify)_ Dynamic radial Lbs. Stationary Load I_I Rotating Load Dynamic thrust_Lbs. Dynamic moment - Ft. Lbs. CH Stationary Load CH Rotating Load (show application of load on sketch) Static thrust-Lbs. Static moment...

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Thin Section Ball Bearings for Gimbal Applications - 12

RBC Aerospace Bearing Products RBC Bearings has been producing bearings in the USA since 1919. RBC offers a full line of aerospace bearings, including unique custom configurations. Spherical Bearings • MS approved to AS81820 (formerly MIL-B-81820) • Boeing and Airbus approved • Self-lubricating • Metal-to-Metal • Slot loaders • High temperature • Low coefficient of friction • Special configurations and materials • MS approved to AS81935 (formerly MIL-B-81935) • Boeing and Airbus approved • Self-lubricating • Metal-to-Metal • Slot loaders • High temperature • Low coefficient of friction •...

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