Radial Spherical Plain Bearings Experience In Exploration And Process

Radial spherical plain bearings are characterized by high rotational accuracy, good rigidity, high load carrying capacity, no wear and high durability.

1. Small orifice restrictor: (1). Change the internal throttling to external throttling, and add a pressure gauge to instantly display the upper and lower chamber pressure. It is easy to maintain, especially it can be cleaned regularly, which is unmatched by the internal throttle.

(2). Throttling ratio. The theoretical value of the throttle ratio β is between 1.2 and 1.5, and 1.25 is preferred based on years of experience. In this way, the geometric accuracy of the main shaft, the geometrical accuracy of the front and rear bearing pads, the concentricity, the roundness and the taper need to be strictly controlled in order to ensure the β value. The e value (the eccentricity of the main axis and the geometric center of the bearing bush) is determined according to the load carrying capacity of the machine tool to optimize the β value.

(3). When the oil chamber is not equipped with the main shaft, the oil column of each oil outlet must be consistent (observation method). If it is inconsistent, the flow rate should be changed by changing the orifice diameter of the throttle. Taking 4 chambers as an example, the oil column of the lower, left and right chambers is generally between 20 and 25 mm, and the diameter of the small holes is 0.25 to 0.4 mm. 3. Improvement of oil supply system: In the oil supply system of NTNRadial spherical plain bearings, except for coarse filtration and fine filtration, the other components have protective effect on static pressure NTNRadial spherical plain bearings. The oil supply system is improved on the basis of the original system.

(1). Connect the pressure relay and pressure gauge (originally in front of the accumulator) at the oil outlet behind the throttle plate so that the operator can see the pressure and pressure of the chamber. When the pressure difference is greater than a certain value, in order to stop immediately, so as to avoid the axle lock. Such as: pressure 2MPa, oral pressure 1.2 ~ 1.6MPa, less than 1.2MPa will stop.