Helicopter Transmission Bearing
JTEKT Corporation (Official website) / Listed on page 3 of the document
A helicopter bearing that supports the gears transmitting engine power to various components. Offers high reliability and the ability to operate after loss of oil.
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How to choose Rolling Bearings
Points to check when selecting, with the values for this product (Helicopter Transmission Bearing).
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1. Bore and housing bore dimensions
Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.
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2. Dynamic load rating based on life calculation
The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.
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3. Margin for static and shock loads
The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.
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4. Operating speed and lubrication method
The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.
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5. Precision grade and internal clearance
Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.
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6. Materials and lubrication suited to the environment
For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.
This guide was written by AI based on the listed products' documents and specification items.
Description
Oil-holed inner ring and under-race lubrication cool the shaft and suppress clearance clogging. Features dry-run performance and uses vacuum-remelted steel.
Features
- Dry-run performance
- Oil-holed inner ring
- Width difference control between inner and outer rings
- Vacuum-remelted steel (VIM-VAR)
Applications
- Helicopter power transmission section
- Gear support
FAQ
- Q. What applications is the helicopter transmission bearing used for?
- A. It is a helicopter bearing that supports the gears transmitting engine power to various components, and is used for gear support in the helicopter power transmission section.
- Q. Can the helicopter transmission bearing keep operating after loss of oil?
- A. Yes, it has the ability to operate after loss of oil and features dry-run performance.
- Q. How is the helicopter transmission bearing lubricated and cooled?
- A. Oil-holed inner ring and under-race lubrication cool the shaft and suppress clearance clogging.
- Q. What material is used in the helicopter transmission bearing?
- A. It uses vacuum-remelted steel (VIM-VAR).
Written by AI based on the content of the source documents.
Source documents
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