| 摘要 |
1,127,406. Bearings. INDUSTRIELLE ELEKTRONIK AGIE LOSONE BEI LOCARNO A.G. 8 Oct., 1965 [20 Aug., 1965], No. 42887/65. Heading F2A. [Also in Divisions B3 and F1] Bearing bushes 12, 13, Fig. 1, at opposite ends of a casing 11 and through which pass pistonrods 19, 20 forming a tailstock centre spindle sleeve on which is mounted an electrode of an electro-erosive machining apparatus (not shown), each comprise at least three uniformly spaced raised bearing surfaces 39, Fig. 2, each forming a closed rectangle surrounding a pressure space 37 to which hydraulic fluid is admitted throrgh a port 40, Fig. 4, and which fluid forms a film between the raised surfaces 39 and the associated piston-rod 19, 20 before being relieved to a relief space 38 having exhaust ports 41 and sealing rings 36. The bearing fluid circuit also includes a motor driven pump 4, filter 7, pressure gauge 8, a pressure-limiting valve 6 and throttle devices 14, 15 in supply bins 162, 161 leading to the pressure spaces. Fluid from the relief spaces is returned through a line 18 to the supply tank. The actuator piston chamber 30 is supplied from a separate motor-driven pump 24 through a reversible solenoid valve and the exhaust line includes a pressure limiting valve 32 whereof the pressure on the exhaust side of the piston 21 is only slightly below that on the pressure side. In a modification the chamber 30 is formed between pistons 211, 212, Fig. 3, connected by a rod 35 and the bearing surfaces 39, pressure spaces 37 and relief spaces 38 are formed in said pistons which have supply and return circuits 161, 18. In a further modification the voltage and current supplied to the solenoids of valve 29 may be varied so as to vary the speed of piston 21 during part of the stroke and to maintain consistency of speed during the remainder of the stroke. In a further modification the coil (291), Fig. 7 (not shown), is vibrated gently by means of a frequency converter (47) resulting in gentle vibration of the rods 19, 20. Such vibration may be imparted by including a throttle valve (50), Fig. 8 (not shown), and a closed storage vessel 51 in the return line 23. |
