Fig. 1 Hydrostatic Thrust Bearing Fig. 2 Point loading of elastic half-space

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Transcription:

Characteristics of Hydrostatic Bearing/Seal Parts of Hydraulic Pumps and Motors for Water Hydraulic Systems (2nd Report, Theory) Xiongying WANG, Atsushi YAMAGUCHI In this paper, the characteristics of disk-type hydrostatic thrust bearings are discussed theoretical point of view. The bearing/seal parts are made up by combining stainless steel/stainless steel and stainless steel/plastics. The characteristics evaluated by the relationship among the load capacity, pocket pressure, film thickness and leakage flow rate are shown numerically. The main results are as follows: 1) the load capacity expressed by the ratio of hydrostatic balance is dependent not only on the supply pressure (with the same restrictor) but also on the elastic modulus of materials; 2) effects of pressure drop at the outlet land of pocket are much smaller than those of elastic deformation; and 3) the calculated results are in good agreement with the experimental results reported in a previous paper. Key words: Hydrostatic thrust bearings, Stainless steel, Industrial thermoplastics, Elastic deformation, Nozzle, Step effect, Water hydraulic pumps and motors, Theory

Fig. 1 Hydrostatic Thrust Bearing Fig. 2 Point loading of elastic half-space

Table 1 Dimensions and parameters of test apparatus Fig. 3 Schema of calculation

Fig. 5 Measurement of Young's modulus (a) Young's modulus in table 1 (b) Young's modulus given by Eq. (15) Fig. 4 Pocket pressure vs. balanced ratio Fig. 6 Pocket pressure vs. balanced ratio

(a) Supply pressure 9.0MPa (b) Supply pressure 5.0MPa Fig. 7 Pocket pressure vs. balanced ratio Fig. 8 Distribution of pressure and film thickness in the bearing/seal parts Fig. 9 Balanced ratio vs. leakage flow rate and film thickness

Fig. 10 Balanced ratio vs.leakage flow rate and film thickness Water Hydraulic Pumps Using Advanced Engineering Ceramics, Proc. of the 4th Scandinavian Inter. Conf. on Fluid Power, 26-29, 965/977 (1995) 4) S. Yoshimoto, Y. Anno, M. Tamura, Y. Kakiuchi, K. Kimura: Axial Load Capacity of Water -Lubricated Hydrostatic Conical Bearings with Spiral Grooves (On the Case of Rigid Surface Bearings ), Trans. ASME, J. Trib. 118, 893/899 (1996) 5) Y. Furuishi, T. Suganami, S. Yamamoto, K. Tokumitsu: Performance of Water-Lubricated Flat Spiral Grooves Bearings, Trans. ASME, J. Trib. 107, 268/273 (1985) 6) A. Yamaguchi: Formation of A Fluid Film Between A Valve Plate and A Cylinder Block of Piston Pumps and Motors (2nd Report, A Valve Plate with Hydrostatic Pads), JSME. Int. j., 30-259, 87/92 (1987) 8) T. Kazama, A. Yamaguchi: Optimum Design of Bearing and Seal Parts for Hydraulic Wear, 161, 161/171 (1993) Equipment, 9) T. Kazama, A. Yamaguchi: Experiment on Mixed Lubrication of Hydrostatic Thrust Bearings for Hydraulic Equipment, Trans. ASME, J. Trib. 117, 399/402 (1995) 10) D. Dowson, C.M. Taylor: Elastohydrostatic Lubrication of Circular Plate Thrust Bearings, Tran. ASME, J. Lub. 89, 237/244 (1967) 11) V. Castelli, G.K. Rightmire, D.D. Fuller : On the Analytical and Experimental Investigation of a Hydrostatic, Axisymmetric Compliant-Surface Threst Bearing, Tran. ASME, J. Lub. 89, 510/520 (1967) 1) H.C. Wong, N. Umehara, K. Kato: The Effect of Surface Roughness on Friction of Ceramics Sliding in Water, Wear, 218, 237/243 (1998) 3) C.A. Brookes, M.J. Fagan, R.D. James, P. Kerry, J. McConnachie: The Development of 14) Christensen, H: Elastohydrodynamic Theory of Spherical Bodies in Normal Approach, Trans. ASME, J. Lub. Tech., 92-1, 145/154 (1970)

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