Deep Groove Ball Bearings IN JMZC 61814-2RZ

 Brand name JMZC 61814-2RZ

New model 6814LLB
Old 1180814K
Inner diameter d (mm) 70 mm
Outer diameter d (mm) 90 mm
B thickness (mm) 10 mm
Reference model 61814-2RZ bearing
Brand JMZC 
Series deep groove ball bearings
Describes the deep groove ball bearings with seals on both sides (60000-2RS type, 60000-2RZ type)
JMZC bearing grease selection
Grease is added in the lubricating oil SOAP and non-SOAP thickener and performance improvement additives have been through precipitation of lubricant works. NTN bearing load in most cases lower than the permissible load, life is usually not determined by fatigue, but rather determined by the grease. JMZC bearing the initial noise and noise effect on the grease life, lubrication and life analysis.
1) early noise
JMZC bearing noise there are dust in the early scars acoustic, acoustic sound, raceways and cages. Dust is the grease of solids by the bearing surfaces while scrolling through irregular pulse, impurity particle size is greater than the 10\mm can detect dirt. In General, high base oil viscosity is not prone to dust, small soft and base oil viscosity, prone to dust. Lithium grease, easy to remove impurities, it is difficult to dust; Lithium complex base grease, SOAP poor compatibility with the base oil, dust the greater urine grease, commonly used in high-temperature grease, not easy to manufacture superior sound performance of grease.
Raceway is rotation scrolling surface contact JMZC bearings making smooth continuous sound. Larger base oil viscosity, oil film thickness, separates hosts the microscopic surface of expanded capacity for raceways are also higher. Scars acoustic bearing Rotary roll surface defects such as scars, indentation, or corrosion on contact produces a periodic pulse tones. Increase in base oil viscosity, scar reduction, high base oil viscosity of the grease has covered up scars acoustic effects. Rotating cage bearing cage vibration and cyclical low and rolling crash issue. Hard and good lubricity, less fat, prone to cages, low temperatures, poor lipid fluidity, is also easy to maintain.
2) noise life
JMZC bearings early in the rotation not only with excellent sound characteristics, and low-noise performance for extended periods. Rose bearing started to sound or vibration does not fully meet the performance known as the noise of life. In recent years, in particular household appliances and office equipment used in a variety of motor and bearing noise in life, there are strict requirements.
Causes of increased bearing noise is generally considered grease lubrication performance degradation, caused due to the increased surface roughness of bearing rollers, but the details are still not clear. Noise in life expectancy varies with the kind of fat, thickening agents in the same, excellent oxidation stability, thermal stability, high viscosity base oil evaporation, the noise increases life expectancy trends. But for miniature and small bearings life requires not only noise, but also low torque, high viscosity base oil used is inappropriate. Benchmark for judging noise life, as bearing size and usage conditions vary, but generally for lubrication life l/3-1/2.