Deep groove ball bearing 6204-2RS double-sided dust-proof seal, high-speed silent wear-resistant motor, universal accessories for agricultural machinery

Description :

　　The deep groove ball bearing 6204-2RS is a standard radial rolling bearing that mainly solves problems such as high friction resistance, low positioning accuracy, and easy wear and heat generation in rotating shaft systems. Its structure consists of an outer ring, an inner ring, steel balls, and a cage, with rubber sealing rings (2RS stands for double-sided contact seal) installed on both sides to effectively prevent dust and moisture from entering the raceway while retaining lubricating grease. Typical operating conditions include low-speed and medium load scenarios such as motor rotor support, water pump impeller shaft, fan spindle, and agricultural machinery transmission wheel. This model belongs to the ISO standard size series, with an inner diameter of 20mm, an outer diameter of 47mm, and a width of 14mm. It is suitable for the journal fit of most small mechanical equipment and is one of the most common replacement parts in industrial maintenance and whole machine assembly.

　　The deep groove ball bearing 6204-2RS is made of high carbon chromium bearing steel (GCr15), and the inner and outer rings are quenched and tempered, with a hardness of HRC60-65 and a surface roughness of Ra ≤ 0.4 μ m, ensuring rolling contact fatigue life. The diameter tolerance of the steel ball is controlled within ± 5 μ m, and the retainer is usually made of stamped steel plate or nylon material, which has good guidance and impact resistance. The implementation standard is GB/T 276-2013 (equivalent to ISO 15:2011), which requires vibration value Z1/Z2 level testing, clearance C0/C2 group screening, and noise testing ≤ 45dB (A) before leaving the factory. The sealing ring is made of nitrile rubber (NBR) or fluororubber (FKM), with a temperature resistance range of -40 ℃~+120 ℃, and can withstand slight axial displacement (about 0.3mm). Some high-end versions offer stainless steel materials (such as SUS440C) for the anti-corrosion needs of the food and pharmaceutical industries.

　　When selecting, it is necessary to clarify the load type: deep groove ball bearings are preferred for pure radial loads; If there is bidirectional axial force, angular contact ball bearings or tapered roller bearings should be selected. 6204-2RS is not suitable for heavy-duty impact conditions (such as crusher hammers), ultra high speed operation (>15000rpm), or high temperature environments (>150 ℃ without special lubrication). Compared with open type bearings (such as 6204-ZZ), the 2RS sealed type is more suitable for dusty and humid environments, but the friction coefficient is slightly higher and the starting torque is slightly larger; Compared with self-aligning ball bearings, it does not have automatic self-aligning function, and the axis alignment error must be ensured to be less than 0.05mm during installation. The purchaser often asks if it is possible to replace imported brands, and the answer is that as long as the size, accuracy level (P0/P6), and clearance are consistent, high-quality domestic products can be completely interchangeable without worrying about compatibility issues.

　　Before installing the deep groove ball bearing 6204-2RS, it is necessary to clean the shaft neck and seat hole, remove burrs and oil stains. It is recommended to use hot installation method (heated to 80-100 ℃) or hydraulic pressing tool, and it is strictly prohibited to directly strike the outer ring. During the initial operation, observe the temperature rise. The normal operating temperature should not exceed 70 ℃. If abnormal noise or vibration occurs, immediately stop the machine to check for oil shortage, foreign object intrusion, or installation deviation. It is recommended to replenish lithium based grease (filling 1/3 of the internal space) every 2000 hours of operation to avoid excessive heat dissipation. Common fault diagnosis: Continuous high-frequency whistling is mostly caused by steel ball damage; Intermittent clicking sounds may come from a broken cage; If the overall temperature rises too quickly, it indicates seal failure or insufficient lubrication. Regular replacement of seals can extend their service life to 3-5 years.

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