GB191111562A - Improvements in and connected with Fluid Pressure Apparatus. - Google Patents

Abstract

11,562. Walker, C. L. May 12. [Cognate Application, 17,442/11.] Revolving-cylinder pumps.-Fluid pumps of the revolving-cylinder swash-plate type are provided with improved means for varying the stroke which renders them particularly suitable for use in hydraulic transmission-of-power apparatus. The rotating cylinder barrel 2, Fig. 8, carries a number of axial cylinders 4, each cylinder containing two pistons 5. The driving- shaft 1 carries, loosely mounted, a sleeve 10 which is integral with a fork 22, Fig. 3 (which is a section on the line A). The shaft 1 carries an arm 17, Figs. 8 and 3, which is provided with a pin 18 carrying an eccentric 19 and sleeve 21, the sleeve bearing on the fork 22. The pin 18 also carries a planet - pinion 20, which, by its engagement with a pinion mounted on a pin 40, and by its revolution around the fixed sun-pinion 24, causes a slight angular oscillation of the sleeve 10, the period being half that of the rotation of the driving-shaft; this oscillation is superposed on the otherwise uniform rotation of the sleeve 10. By this means the irregularities in the piston motion due to the obliquity of the swash-plate are corrected. The swash-plate 7, shown in Fig. 2, which is a section on B B, Fig. 8, rotates on ball bearings on the face of the fixed plate 9, and is provided with a spherical part 31. Inwardlyprojecting pins 11 are provided carrying rollers 11<a>, which oscillate in the tracks 14, 14<d> in the sleeve 10 and transmit the drive to the disk 7. The inlet and exhaust ports are formed in the casing. The apparatus shown is duplicated on the other side of the line X X. In the position of ' no delivery ' of the pump, the two swashplates are parallel so that the two pistons in each cylinder move in the same phase. The delivery is varied or reversed by turning the two inclined plates 9 in opposite directions so that they are inclined to one another, but the inclination to the axis of the apparatus remains the same. The above-described pump may be used as a motor, or two elements may be used together as a transmission-of-power apparatus. Fig. 1 shows a fluid transmission-of-power apparatus with a modified construction of pump and motor. The pump on the right has both cylinders 1 and pistons 3 socketed in swashplates 2, 4, the passages 5 through the ball joint communicating with the port 7 in the valve disk 8, which is stationary except when changing speed. The two swash-plates have their secondary angular oscillation imparted to them by means of the perforated balls 22, which are mounted on eccentric portions 12, 13 of the shafts 16<a>, 16<b>, which are rotated by the gearwheels 36, 37, 38 and 39, 37<a>, 38<a>. The sunwheels 36, 39 are stationary, the others being carried around by the driving-shaft 24. The shaft 16 and inclined member 17 are stationary except when changing speed; they are turned by the worm 14, which gears with the worm 18 and simultaneously adjusts the valve plate 8. Leakage is prevented by the spring 41. The motor element on the left is shown with its swash-plates at their maximum inclination to each other, and thus in the position of maximum cylinder capacity. It is preferably used in this position, the valve disk 20 being turned by the worm 21 simultaneously with the valve disk 8. In this way, any motor speed from a maximum, through zero, to a reverse maximum can be obtained.