Bearing for Gyroscopes

Specifications

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Bearing for Gyroscopes).

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

About Rolling Bearings and all products

Description

Small bearings for gyroscopes with bore diameters from 1 mm to about 6 mm; angular contact ball bearings are mainly used for the rotor. Rotor bearings use oil-impregnated cages and self-lubrication, while gimbal bearings use low-torque steel plate cages. Maximum starting torque ranges from several μN·m to several tens of μN·m.

FAQ

Q. What types of bearings are used for the rotor and gimbal of gyroscope bearings?

A. Angular contact ball bearings are mainly used for the rotor. Rotor bearings use oil-impregnated cages and self-lubrication, and gimbal bearings use low-torque steel plate cages.

Q. What is the maximum starting torque of gyroscope bearings?

A. The maximum starting torque ranges from several μN·m to several tens of μN·m. The specifications list a maximum starting torque (R1) of 7.95 to 5.20 μN·m and a maximum starting torque (R3) of 63.5 to 44.0 μN·m.

Q. What dimensions and accuracy grades do gyroscope bearings cover?

A. They are small bearings with bore diameters from the 1 mm range up to about 6 mm, and outside diameter (D) of 3.175 to 22.225 mm. Accuracy is precision grade (CLASS 7P or higher).

Q. What is the contact angle range for the rotor bearings of gyroscope bearings?

A. The rotor contact angle is 20 to 28 °.

Written by AI based on the content of the source documents.

Source documents

• Document Technical Report CAT. No. E728h (ローリング ベアリングの技術資料) 154 pages
  Found on: https://www.nsk.com/tools-resources/technical-report/