中文简体
English
Español
Deutsch
In industrial fields that pursue ultimate mechanical performance, bearings, as core transmission components, directly determine the efficiency, reliability, and service life of equipment through their design and selection. Among them, four-point contact double-row ball bearings are highly favored in many critical applications due to their superior performance resulting from their unique structure. As a representative of deep-rooted bearing technology innovation, Ningbo Jinxin Bearing Technology Co., Ltd. is committed to optimizing bearings through cutting-edge technology, endowing them with faster speed potential, lower operating noise, and a smoother user experience.
Q: What exactly is a "four-point contact" ball bearing? What is its core design concept?
A: The core design of a four-point contact ball bearing lies in the special shape of its raceway (usually a Gothic arched raceway). This design allows a single ball to theoretically form four contact points between the raceway and the ball when bearing a load (two points in the inner raceway and two points in the outer raceway). Its core concept is to achieve the ability to withstand bidirectional (radial and axial) combined loads using a single bearing structure while maintaining a relatively compact size. This is significantly different from single-row angular contact ball bearings, which require paired bearings to withstand bidirectional axial loads.
Q: What are the key performance improvements that double-row ball bearings bring to four-point contact ball bearings?
A: The parallel design of the double-row balls is key to this performance leap. First, it significantly enhances the bearing's radial load capacity and overturning moment stiffness, allowing it to more stably support rotating components and resist the effects of external eccentric loads or bending moments. Second, the double-row structure provides a larger total ball contact area, helping to distribute loads more evenly and reduce stress at individual contact points, thereby improving overall load capacity and expected life. This is crucial for applications requiring high rigidity and anti-overturning capabilities, such as robot joints and precision rotary tables.
Q: What are the unique advantages of four-point contact double-row ball bearings in terms of axial load bearing capacity?
A: One of the most prominent advantages of this type of bearing is its superior bidirectional axial load bearing capacity. Thanks to the four-point contact principle, a single bearing can simultaneously withstand axial thrust from two directions (whether pure axial force or a combined load with radial force), while maintaining low frictional torque under axial loads. This gives it unparalleled advantages in applications requiring frequent forward and reverse rotation or bidirectional thrust (such as gearboxes, worm gear drives, and preloaded parts of slewing bearings), simplifying design and saving space.
Q: What challenges do four-point contact double-row ball bearings face in applications requiring higher speeds? How does Ningbo Jinxin address these challenges?
A: At high speeds, the main challenges are internal frictional heat generation, the centrifugal force effect of the balls, and the retention and distribution of lubricant. Excessive temperature rise accelerates lubricant aging, leads to material performance degradation, and can even cause failure. Ningbo Jinxin Bearing Technology Co., Ltd. understands this well. Its technological innovation focuses on optimizing internal geometry (such as channel curvature and contact angle) to reduce friction and heat generation, and refining cage design and materials. By adopting advanced cages with excellent pocket guidance and low friction characteristics (such as engineering plastic or specially surface-treated metal cages), they effectively reduce oil churning losses and ball collisions at high speeds, thereby increasing the limiting speed while reducing operating noise, aligning with their technical goal of "faster speed, lower noise."
Q: How do you understand the considerations for noise control in four-point contact double-row ball bearings?
A: Bearing noise mainly originates from the vibration and impact between the balls and raceways, and between the balls and the cage. The four-point contact design inherently involves many contact points, placing extremely high demands on raceway precision, ball size consistency, and roundness. Any minute geometric deviation can be amplified into annoying noise in high-precision or quiet applications (such as medical equipment and office automation equipment). Ningbo Jinxin incorporates "a more comfortable user experience" into its technological DNA. Therefore, it implements extremely strict tolerance control and surface finish management during manufacturing, combined with optimized internal clearance design and precision assembly processes, striving to minimize vibration sources and ensure smooth and stable bearing operation, achieving low-noise or even silent operation.
Q: Why is it said that the design of four-point contact double-row ball bearings places specific demands on lubrication? How is Ningbo Jinxin's technological philosophy reflected in this?
A: The four-point contact area is relatively concentrated, with high contact stress, and the internal space of the double-row structure is complex, posing challenges to the lubricant's ability to reach the contact area and its long-term retention performance. Poor lubrication directly leads to accelerated wear, excessive temperature rise, and a sharp reduction in lifespan. Ningbo Jinxin's technological innovation not only focuses on the bearing body but also extends to matching lubrication solutions. They deeply understand the lubrication requirements of different operating conditions (high temperature, low temperature, high speed, heavy load, vacuum, etc.), and ensure that the lubricant can form an effective oil film in the four-point contact area by providing professional lubrication advice or developing products pre-filled with high-performance grease. This reduces wear, extends service life, and lowers maintenance requirements, thereby improving overall equipment reliability and user comfort.
Q: What are Ningbo Jinxin's technological optimization directions for four-point contact double-row ball bearings in meeting various complex working conditions?
A: Complex, variable, and even extreme working conditions (such as impact loads, vibration environments, drastic temperature changes, and contamination risks) pose a severe test to bearing reliability. Ningbo Jinxin Bearing Technology Co., Ltd.'s technological innovation focuses on materials science, heat treatment processes, and surface strengthening technology. By selecting high-purity, high-toughness bearing steel, applying advanced heat treatment technology to obtain ideal metallographic structure and residual stress distribution, and employing special surface coatings or treatments (such as anti-corrosion coatings, surface nitriding, etc.) when necessary, they endow four-point contact double-row ball bearings with stronger fatigue resistance, higher impact toughness, and superior corrosion and wear resistance. This deep cultivation of materials and processes is the solid foundation for meeting the stringent requirements of customers under different working conditions.
