Ningbo Kent Bearing Co., Ltd

As a motor manufacturer, have you ever encountered batch‑rework issues caused by premature bearing failures, or lost high‑end orders due to excessive noise?   The root cause often lies in the fine details of the sealing structure. The choice between ZZ and 2RS is essentially a matter of working‑condition matching.   The ZZ type double‑sided metal dust shield adopts a non‑contact design with extremely low friction torque, making it inherently suitable for high‑speed motors. By contrast, the 2RS type rubber seal delivers superior sealing performance; however, its contact‑type friction will limit rotational speed and raise temperature rise. It is better suited for low‑speed heavy‑duty applications or heavily contaminated environments.   An agricultural motor manufacturer’s products have long been deployed in dusty, humid field‑working environments. Initially, ZZ‑type bearings were adopted. Although the rotational‑speed requirements were met, a large number of seizure failures occurred within half a year caused by water and dust ingress, with a rework rate as high as 18%.   The root cause was that the non‑contact structure of ZZ shields could not resist the intrusion of moisture and fine dust. Condensation and rust tended to form inside the bearing, especially under large temperature fluctuations during start‑stop cycles.   We recommended switching to KENT‑produced 6202‑2RS bearings. The double‑sided rubber seal of the 2RS adopts an interference‑fit contact design to create a physical barrier, effectively blocking mud‑water, dust and moisture.   Meanwhile, KENT optimized the aging‑resistance performance of the rubber material as well as lip pressure distribution. While maintaining reliable sealing performance, the friction torque is kept within a reasonable range to avoid excessive speed limitation.   After the replacement, the motor failure rate dropped below 2% under the same harsh working conditions. The customer commented: “It keeps working well even when exposed to rain”. Although 2RS seals are not suitable for ultra‑high‑speed applications, their protective value is irreplaceable in low‑speed, heavy‑duty and heavily‑polluted scenarios.  

Kent Bearing   A follower commented and asked: “How do you tell if a bearing manufacturer is reliable?” Having run a bearing factory for over 20 years, here is my take: look past the quotation and focus on three key details.   First, check testing capabilities. A credible manufacturer must have its own in‑house laboratory capable of spectrum analysis, metallographic examination and noise testing, instead of merely relying on test reports supplied by raw‑material vendors.   Second, assess process consistency. Find out whether grinding operations are carried out on CNC equipment and whether assembly takes place in a dust‑free workshop. These factors directly determine bearing batch‑to‑batch consistency.   Third, evaluate technical responsiveness. When you raise special requirements, see if the supplier makes excuses or proactively arranges engineers to work out solutions together.   Last year, a servo‑motor manufacturer approached Kent Bearing. They required bearings to run below 35 dB at 8000 RPM. Many factories simply replied “it cannot be done”. We, however, spent two weeks modifying cage materials and heat‑treatment processes. The final delivered product measured 32 dB in actual testing. We also helped them optimise the fit tolerance for motor end covers. A truly reliable bearing manufacturer will not hide behind “industry standards” as an excuse; instead, it is willing to invest R&D resources to match your requirements. Furthermore, a word for motor manufacturers: sourcing a trustworthy supplier is not a one‑off transaction, but building long‑term collaborative partnership. A good bearing supplier does not just sell components. It understands your motor design parameters, load characteristics and application scenarios, and helps turn bearings from ordinary spare parts into performance enablers.   Kent Bearing once co‑developed custom‑built bearings with an industrial drone‑motor manufacturer. We joined testing from the prototype phase and jointly solved the problem of grease throw‑off under high‑speed operation. The end product achieved 30 % longer service life than competing solutions and became one of their core selling points.

  Data released by the China Association of Automobile Manufacturers (CAAM) on the 12th shows that in July 2026, new‑energy vehicles accounted for over 60% of monthly new‑car sales for the first time. Monthly auto exports exceeded 1 million units for two consecutive months, with new‑energy vehicles making up more than 50% of such exports over the same period.   Within a precision machine like an automobile, deep‑groove ball bearings 6201, 6202, 6203 and 6004 may go unnoticed, yet they act as the “joints” enabling smooth operation of automotive accessory motors. Compact in size, they perform critical functions of supporting rotors and reducing friction, and directly determine the service life and noise‑free performance of water pumps, oil pumps, air‑conditioning blowers and cooling fans.   Take the 6201 bearing as an example. It is widely applied in electronic water pump motors. Water pumps run continuously at high speeds to dissipate heat for batteries or engines. Thanks to its moderate bore size and load‑bearing capacity, the 6201 maintains stable performance at several thousand revolutions per minute, preventing seal failure and water leakage caused by vibration. For oil pumps in fuel‑powered vehicles, the 6202 bearing features a slightly larger outer diameter and higher rigidity. It better withstands radial loads induced by fluctuating oil pressure, ensuring consistent oil supply and avoiding poor engine lubrication.   Vehicle air‑conditioning systems are extremely sensitive to noise. Manufactured by Kent Bearing, the 6203 bearing delivers an ideal solution with optimized internal clearance and super‑smooth raceways. One motor manufacturer once approached us to resolve a persistent humming noise when the air‑conditioning system was switched on. Through efforts from the Kent technical team, the noise disappeared immediately after fitting properly‑specified 6203 bearings, and air output became more even.   These bearings may look ordinary, but they undergo rigorous refinement in material selection, heat treatment and precision assembly. Kent Bearing pursues no flashy gimmicks, focusing instead on steady load‑bearing and smooth rotation within compact dimensions. It is these tiny, reliable “joints” that allow the vehicle’s water, oil and air systems to operate quietly and efficiently day in and day out, safeguarding overall vehicle comfort and safety.