- Precision mechanical components
Solution to Precision Mechanical Assembly Challenges -The Cartridge Bearing Case Study-
As MinebeaMitsumi, a recognized professional in bearings, we achieve quieter and longer-lasting motors through our meticulous preload management and superior assembly/bonding expertise.
Solution to Precision Mechanical Assembly Challenges
The Cartridge Bearing Case Study
Contribute to a motor's quietness and longevity through meticulous preload management and assembly/bonding expertise
Precision mechanical assembly for cartridge bearings
Cartridge bearings are highly precise ball bearings assembled with a shaft and housing. They are delivered with an optimal preload applied, which is an intentional internal force that significantly enhances performance.
This product is a testament to the expertise that MinebeaMitsumi has cultivated over the years. We manage the delicate clearance within the bearings to apply the right preload and utilize assembly and bonding techniques to minimize shaft runout and play. We achieve this high level of precision even on assemblies using tiny bearings with outer diameters of just 4-5mm.
In essence, cartridge bearings are the culmination of our ultra-precision machining, assembly, and bonding expertise, all built upon our extensive knowledge of bearings.
What's amazing about cartridge bearings?
Meticulous preload management significantly improves runout and play
At our Precision Mechanical Assembly, our strength lies in using the inherent internal clearance of ball bearings, a technique we call "preload."
Preload is the axial load applied to a bearing to eliminate internal clearance, which in turn increases rigidity and suppresses runout and impact. However, managing this preload is extremely difficult and requires extensive experience and expertise. If the preload is too high, rigidity increases, but it can also lead to increased noise and reduced lifespan. Conversely, if it's too low, the rigidity becomes insufficient, and runout and play become excessive.
Leveraging over 70 years of experience in manufacturing and handling bearings, MinebeaMitsumi's cartridge bearings are designed to apply the optimal preload tailored to each individual bearing. As shown in the video, this significantly improves shaft runout and play, which in turn contributes to enhanced performance in the final product, such as motors. This leads to longer lifespan, lower noise, and greater rotational accuracy. Our cartridge bearings allow you to specify the preload in increments of 0.5N.
World's No. 1 High-Precision Assembly and Bonding Technology Ensures Stable Supply of High-Quality Products*
Leveraging our comprehensive knowledge of bearing internal characteristics, our design, assembly, and bonding technologies can guarantee high-precision shaft alignment.
Managing and precisely assembling and bonding very small bearings and components, some with outer diameters of just a few millimeters, is labor-intensive and requires highly skilled technicians. Training these technicians is a time-consuming process.
MinebeaMitsumi holds the top global share* of over 60% in miniature and small-diameter ball bearings with outer diameters of 22mm or less. Our product lineup includes the world's smallest* ball bearing with an outer diameter of 1.5mm and the world's smallest* stepping motor with an outer diameter of 3.3mm. This showcases our capability to provide a stable supply of high-quality products, handling everything from micro-fabrication to assembly and bonding at a sub-micron level.
Our technological expertise, including our preload management, has earned us a strong reputation for high-precision bearing assemblies for hard disk drives, where we currently hold an 80% global market share.
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*Based on our research.
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Introducing Precision Mechanical Components (PMC):
mechanical parts and sub-assembly products that maximize bearing performance.
Leveraging the technical expertise of a bearing specialist, including ultra-precision machining technology and assembly know-how, PMC products bring out the full potential of bearings. They address critical challenges related to rotational accuracy, lifespan, and vibration.
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