Development and Mass Production
of Electric Motor-Use Deep Groove Ball Bearings
with Optimized Sound Output:
Reduction of Sounds That Can
Be Unpleasant to the Ear
- Customer outlineIndustrial electric motor and household electronics manufacturers
- ProductIndustrial electric motors
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Problems
- In the robotics industry, more and more pleasant-sound bearings are being required for robots being used in scenarios that involve close interaction with humans, such as in nursing care.
- The need for rotation that is quiet and doesn’t hurt the ears means a greater requirement for sensitive quality.
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Solutions
- Optimizing the raceway surface with 3D analysis technology (even smoother than before)
- Implementing sound evaluation to reflect the senses of humans through the use of not only existing evaluation methods for vibration and noise, but also a loudness index
Achievements
- Reduced noise
- Improved the sound quality of the rotation sound: Reduced the kinds of “sounds that can be unpleasant to the ear” (−5 dB compared to previous models)
- By making it so that the raceway surface is smoother than before, we were able to reduce the bearing rotation sound that falls within the range of sounds that are unpleasant to the ear (roughly 1,000–5,000 Hz) from among the range that is audible to the human ear (roughly 20–20,000 Hz). (−5 dB compared to previous models.)
A Message from JTEKT
We have optimized the raceway surface by making it smoother than before.
We succeeded in reducing the sound pressure that falls within the frequency range that is unpleasant to the human ear (1,000–5,000 Hz). We have also, for deep groove ball bearings of some sizes, already applied this to all fields, not just electric motors.
Product
- We present the products that best suit each customer’s needs, combining technologies such as the new ceramic ball bearing and low torque, long service life grease.
- Product
- • The following series manufactured in the Tokushima Plant and Kameyama Plant
6000～6002、6901～6902
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