Patent GB-792463-A (GB)
Title: Improvements in and relating to internal gear machines and their applications
IPC: F01C20/14
Filed: 1955-02-01
Abstract: 792,463. Rotary engines and pumps. PATIN, P. C. Feb. 1, 1955 [Feb. 15, 1954; Sept. 29, 1954], No. 2998/55. Class 110 (2). [Also in Group XXIX] A rotary pump or motor, Fig. 2, of the n and n+1 lobe type, comprises a pair of cams 7, 8 acting as inlet and exhaust timing members which are disposed as shown. The gears 3, 4 are mounted between flanges 5, 6 having annular grooves 13, 14 communicating with inlet and exhaust ducts 15, 16 respectively. In a modification, Figs. 4, 5 and 6 (not shown), the exhaust disc is provided with a peripheral indentation having substantially the same length as the root arc of one of the outer gear teeth. In a second modification, Figs. 7, 8 and 9 (not shown), an inlet disc similar to the exhaust disc of Figs. 4-6 is provided and the exhaust disc is dispensed with, the flange 6 being provided with triangular-shaped discharge ports. Again the inlet and exhaust discs may both be dispensed with, Figs. 10 and 11 (not shown). A fourth modification, see Fig. 12 and Figs. 13, 14 (not shown), incorporates a disc 28 which has a centring edge 29 overlying the inlet disc 27 and is slidably located on the shaft 1 by two axiallyoffset pins 33. The pins 33 engage a helical groove 34 formed in a rotary sleeve 35 which is adjusted to vary the relative angular position of the discs 27, 28 by a fork 37. In a further modification, Fig. 15, the outer gear 46 is adapted to slide on the rotor 45 and on a stationary sleeve 47 which receives a distributer 49 rigid with the shaft 40. A disc 53 is slidably mounted on the rotor and is shaped to close all the pockets formed in succession between the members 45, 46, see also Fig. 16 (not shown). The disc 53 is held against the member 46 by an annulus 55 screwed thereto. The distributer 49 is formed with semi-annular grooves 57, 59 acting as exhaust and inlet apertures respectively. The groove 57 communicates with passages 51, 58, 63-65 whilst the groove 59 communicates with passages 51, 58 and 60-62. The spaces 66, 67 on either side of the members 46, 53, 55 are interconnected by ducts 68, ports 69 and the aperture 70. The member 46 may be moved by a rack-and-pinion mechanism or by a lever or a fork. An hydraulic transmission, Fig. 17, comprises an oil pump 38 as described with reference to Figs. 1-3 and a motor 39 as described with reference to Fig. 15, which are connected together as shown with the interposition of a flow reverser 79, a by-pass means 75 having a relief valve 74, an air valve 76 and a pressure-reducing device 78. The casing 44 and the member 46 define a chamber 101 which communicates with a pocket 36 by a duct 105 and is also connected to the exhaust pipe 73 through a pipe 106 and a junction 107, whereby the motor operates under constant pressure. In a final modification, see Fig. 18 and Fig. 19 (not shown), the rotor is mounted on a hollow shaft 80, 81 and is displaceable within an outer gearing 83 having end-plates 84, 85 secured thereto. The fluid is introduced at 86-88 and exhausted through ports 90, 91, as shown. The driven shaft 94 is connected to the rotor by pins 97, 99-the distance therebetween being equal to the throw of the eccentric. Specification 792,462, [Group XXIV], is referred to.