Patent GB-643735-A (GB)
Title: Improved apparatus for quantitatively delivering fluid media under pressure
IPC: F16N25/02
Filed: 1947-08-11
Abstract: 643,735. Lubricant distributers. SATZYGER, E. Aug. 11, 1947, No. 22219. Convention date, Jan. 9, 1947. [Class 12 (iii)] [Also in Group XXIX] A device for distributing measured quantities of fluid, particularly lubricant, driven by the pressure of the delivered fluid, comprises a plurality of pistons, the surfaces of which remote from the working chambers of their cylinders are under the pressure of the delivered fluid, and all of which are coupled together by a member which so controls their movements that the driving force applied to at least one piston is transmitted to all the other pistons, which drive in turn. As shown, Fig. 1, lubricant is conveyed under pressure through a connection 28 and channel 29 in the cover 10 of a housing 5 containing four pistons 1 ... 4 each having a recess 14 to engage the enlarged rim 13 of a swash-plate 7 mounted on a spherical trunnion 6 and guided by a central pin 8 engaging an annular groove 9 formed in a recess 11 in the cover 10. Each piston has a control recess 15 which communicates with a pressure chamber 25 in the housing 5 by inlet channels 24 and with outlet nipples 26 by channels 30. Working chambers 20 ... 23 of the pistons, which are arranged in pairs, communicate with each other by channels 17, 16 and 19, 18. In operation, as shown in Fig. 3, piston 1, in its lowermost position, has its outlet channel 30 in communication with the working chamber 21 of piston 2 which is moving downwards due to the difference in pressures between the pressure chamber 25 and outlet 30, thereby forcing lubricant through the channel 16 and outlet 30. This movement tilts the swash-plate 7 thereby moving the other pistons, which, being in quadrature, follow the same sequence in turn. Modifications describe a 6, 8 and 16 point distributer and a four point distributer in which the four pistons are connected in series instead of pairs. Further modifications describe the substitution of a circular groove or two straight grooves for the inlet channels 24, and the extension of the outlet channels 30 to the other side of the piston together with an annular groove in the piston to prevent lateral piston stresses. The swash plate may be guided by a spherical top member and two balls, or alternatively a crank, or again a strut member of such length as always to tilt the swash-plate. In a further modification to provide more distribution points, two distributers may be mounted with their tops adjacent and swash-plates interengaging. Reduced numbers of outlets can be effected by interconnecting a pair of outlet channels; this also provides a variation in delivery quantity which may alternatively be provided by pistons of varying diameter. Odd numbers of outlets are effected by sealing an outlet nipple. and connecting the. outlet channel with the pressure chamber. Small deliveries are effected by a construction having control pistons in communication with very small separate distributer pistons, or alternatively a common piston may have a small diameter distributer portion and a larger diameter control portion. A still further modification describes a construction in which the swash-plate is replaced by four rollers and at the ends of each are. spherical trunnions, in quadrature, which engage transverse bores in the pistons, thereby transmitting the drive.