Patent GB-633842-A (GB)
Title: Improvements in and relating to hydraulic rotary blade apparatus adapted to operate as a pump or as a motor
IPC: F04C14/18
Filed: 1946-11-12
Abstract: 633,842. Rotary engines and pumps. NICOLAS, J. J. Nov. 12, 1946, No. 33658. Convention date, Nov. 12, 1945. [Class 110 (ii) ] A rotary pump and a rotary motor of the axially sliding vane type one or both of which are as described in Specification 630,260, are combined in a hydraulic apparatus in which the speed of the motor depends on the output of the pump. The pump rotor 65, slidable on its driving shaft 66, carries sliding vanes 67 through a pumping chamber 76 which supplies a motor chamber 77 to drive vanes 74 carried by a motor rotor 62 secured to a driven shaft 63. The rotor 62 carries abutments 68 and a face cam 69 which causes the axial movement of the vanes 67. On the outside of the rotor 62 are abutments 71 and a face cam 72-forming with the drum 73, slidingly keyed inside the body 61 and carrying the axially-sliding vanes 74, the motor part of the apparatus. Connecting ports 79, 78, between the pump and motor chambers 76, 77 are controlled by slide valves 80, 81 which float between pairs of springs 102, 103, Fig. 4, and extend hydraulic pressures controlled by such valves as 110. The valves 80, 81 are in bores 97, 98 which communicate through circular grooves 99, 100 in headplates 61 by way of channels 108, 109, when the valve 110 is positioned accordingly. When the parts 106 of the valves register with ports 78, 79, the pump is short-circuited and delivers no fluid to the motor. At the same time the section of the duct 79 opening into the chamber 77 communicates with a channel 84 (not shown) leading to an accumulator 89 through a groove 87 in the body 61. Hydraulic braking is thus produced, the pressure of fluid in the accumulator opposing the rotation of the rotor 62. By operating the cock 110 to connect an accumulator 88 and pipe 108, and simultaneously connect pipe 109 with accumulator 89, fluid under pressure acts through the groove 99, members 80,81 move to compress springs 103 so that ports 104 register with ducts 78, 79 and allow fluid to pass freely through the ducts 78, 79. The secondary rotor 62 is thus driven in the same direction as the shaft 66, for forward drive, as shown by the arrow f (Fig. 2). In a further position, Fig. 7 for reversal of drive of the rotor 62, accumulator 88 is connected with duct 109 and accumulator 89 with duct 108. Fluid delivered from chamber 76 passes through a channel 82 into the motor chamber 77 beyond the abutment 71. For maximum speed reduction of the apparatus; the volume of chamber 77 is a maximum and that of chamber 76 a minimum and when 76 is zero there is no drive. The variation in volumes of chambers 76, 77 is obtained through movement of a control slide-valve 114 to bring one or other of ducts 115 (connected to pump delivery) or 116 (connected to pump suction) into communication with a channel 117 leading to the chamber 77. The movement of the drum 73 is transmitted by a rocker 118 to a slide valve 119 which provides communication with the delivery end of the pump of the space comprised between the rotor 62 and the bottom of the rotor 65, to make the latter move in a direction opposite to the direction of movement of the rotor 62. The control valves 80, 81 may be modified in shape. Fluid from the accumulator 88 may be used for starting the apparatus into motion. In a motorcar valves 110 may be controlled by pedals or hand controls.