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About rolling bearings; there are tumbling conflicts inside; there are also sliding conflicts; in the case of high-speed rotation; if the smoothness is bad, it will wear, heat, burn, and all damage. If the viscosity of the oil is too low; Large time; simply constitutes smooth oil film cracking; constitutes dry conflict and aggravates wear, smooth oil viscosity is too large; light will increase bearing conflict resistance; increase oil temperature; heavy will affect oil activity; difficult to form oil film On the contrary, it is harmful to the bearing; therefore; the smooth oil viscosity of the rolling bearing is uniquely selected. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Ball and cylindrical roller bearings with mechanical oil; at medium, low speed and normal temperature; usually available with L AN22, L AN32, L AN46 viscosity grade smooth oil; high speed; bearings with large inner diameter can choose a lower viscosity Smooth oil; vice versa; use a smoother oil with a higher viscosity.
Tapered roller bearings; spherical roller bearings and thrust spherical roller bearings; because they are subject to radial and axial loads; therefore, at the same temperature; higher viscosity than ball and cylindrical roller bearings Smooth oil. Under normal temperature and normal temperature conditions; tapered roller bearings and spherical roller bearings; oil viscosity is limited to L AN32 viscosity. The viscosity of thrust spherical roller bearings is limited to L AN46 viscosity. Mechanical oil.
Needle roller bearings have a large sliding conflict; the demand is more useful smooth; so the viscosity grade of the oil is compared with the ball bearing of the same standard speed; usually it should be lower.
Regarding the sliding bearing; the viscosity of the oil is selected in relation to the diameter of the journal, the rotational speed of the shaft, and the size of the load per unit area. The viscosity is selected in the range of L ANl5 to L AN68. The rotation speed is high; the bearing with a large journal diameter; The viscosity can be lower; on the contrary; the viscosity of the oil should be higher.
Regarding the machine tool guide rails; the sliding guide rails under normal working conditions should be smoothed with mechanical oil; the viscosity of the oil should be determined according to the rail load size, speed bump, horizontal or vertical, ambient temperature bump. Horizontal rail should be selected L AN32 ~ L AN68 viscosity smooth oil; and vertical guide rail should select L AN46 ~ L ANl00 viscosity smooth oil.
Regarding gear transmission; because the practical contact stress between the teeth is often high; the engagement time of each point on the tooth surface is shorter; and the sliding occurs together with the tumbling during the engagement; thus; the effect of forming the liquid oil film is very weak. Smoothing is mainly done by relying on the oil film of the divide. The gear load is larger; the viscosity of the selected oil should be higher and the speed is higher; the lower the viscosity of the selected oil, the higher the working environment temperature; the higher the viscosity of the selected oil should be. Gear transmission with L AN46 viscosity mechanical oil can meet the requirements.
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Smoothness of commonly used components
Source: China Bearing Network Time: 2014-08-02