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More than 80 percentages of high-speed sealed angular-contact ball bearings are lubricated by grease. The grease filling amount has a great influence on bearing performance and service life. The static space ratio λs and movement space ratio λd were analyzed and calculated in this paper. Bearing temperature performance tests were conducted using different amounts of filling grease. The temperature performance of bearings with different grease was compared under different working conditions. The optimum grease filling amount of this kind of bearings is obtained through experiments. The conclusion can provide reference for bearing application. Introduction High-speed sealed angular-contact ball bearing has the advantages of simple structure, easy assembly, low heat generation, etc. The sealing bearings and open bearings have the same size and standard series. They are often matched with electric spindles which are widely used in the machine tool industry [1, 2]. In a rolling bearing, fatigue life, friction, temperature rising, vibration and so on are all affected by the grease. Without proper lubrication, the bearing will not work properly. Excessive or insufficient grease will have a certain impact on the performance of bearing, so the determination of the amount of grease is particularly important [3, 4]. In actual applications, for the need of determining the amount of grease accurately in the high speed sealed angular contact ball bearings, national standards were often used as the basis. Many bearing companies do not have accurate data of grease filling amount [5]. Therefore, it is of great practical significance to analyze the filling grease amount of high-speed sealed angular-contact ball bearing. Determination of Sealing Space Sealing full space V: two sealing rings, the bearing inner ring and outer ring wrap an annular space. This space minus the volume of cage and rolling elements gains the V. In order to facilitate the calculation, the bearing is carried out simplified as follows: all dimensions of the bearing are given by the national standard, and the influences of the tolerances are ignored during the calculation. Effects of sealing ring lip clearance, transmutation as well as clearance on the inner space of the bearing are ignored. Sealing full space of high-speed sealed angular-contact ball bearing can be obtained by the following equation: r c t 2 s 1 s l cr i 0 V V V V V V V V V V − − + + + + + + = . (1) Here, Vo is the outer ring channel volume. Vi is the inner ring channel volume. Vcr is the circular ring volume between inner and outer rings. Vl is the volume of slope part, located in the inner ring lock. Vs1 is the volume of the sealing ring on the side of the outer ring. Vs2 is the volume of the sealing ring on the side of the inter ring. Vt is the volume located between the step on both sides of the inner ring and the sealing ring. Vc is the Bakelite cage volume. Vr is the volume of the cage. 6th International Conference on Mechatronics, Materials, Biotechnology and Environment (ICMMBE 2016) © 2016. The authors Published by Atlantis Press 317 Sealing movement space Vd: when the bearing inner ring is rotated, the space of rolling element and cage is shown in A area in fig.1. Sealing static space Vj: when the bearing inner ring is rotated, it will not be driven by the rotation of the sealed space as shown in B area in Fig.1. Movement space ratio λd: with the ratio of sealing movement space Vd and sealing full space V, it can be given as V / Vd d = λ . (2) Static space ratio λs: the ratio of sealing static space Vj and sealing full space V, it can be given as V / Vj s = λ . (3) Fig.1. H7005C-2RZ bearing inner space Experimental Conditions and Methods The selection of the experimental bearings should ensure the same parameters. Experiments were divided into four groups. The grouping method is in accordance with the amount of filling grease. The ratios of grease are 20, 30, 40, 50 percentages respectively. The amount of filling grease is give by

The Effects of Grease Filling Amount on Temperature Performance of High-Speed Sealed Angular-Contact Ball Bearings