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.

Oplossingen Details

How do motor manufacturers balance sealing performance and service life?

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.

 

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