GB920557A - Fluid drive - Google Patents

Abstract

920,557. Hydraulic couplings. AMERICAN RADIATOR & STANDARD SANITARY CORPORATION. June 13, 1961 [June 23, 1960], No. 21269/61. Class 69 (2). An hydraulic coupling comprises an impeller 54, runner 56, a scoop chamber 46 for maintaining a desired level of fluid in the coupling, and fluid outlet passage means 105 carried by the runner for removing fluid from the coupling during acceleration of the impeller above the speed of the runner. The passage means 105 are formed in an end wall 104 of the runner and, at one end, open into the working chamber 66 of the coupling to face fluid discharged from the impeller, and at the other end have nozzles 113 which can be replaced by others having different characteristics and open into the scoop chamber 46 connected by an opening 111 to a reservoir 86. The working chamber of the coupling is also connected by openings 50 with the scoop chamber and the fluid level in this coupling is normally controlled by an adjustable scoop tube 70 which discharges into the reservoir 86 and is connected by rack-and-pinion gearing 77, 102 to a manually or automatically movable rod 103. The fluid in the reservoir is forced by a pump 88, which is driven by a chain 90 from an input shaft 28, through a pipe 98, cooler 100 and pipe 58 to a channel 60 connected by passages 62, 64 to the working circuit of the coupling. During operation, fluid displaced by the impeller enters the passages 105 and if the pressure is sufficiently high as a result of excessive acceleration of the impeller above the speed of the runner or overloading of the latter, the fluid flows through the passage 105 against centrifugal force into the reservoir to limit the quantity of fluid in the coupling and the torque transmitted. The nozzles 113 of some of the passages may be at different radial positions to those of the others and the passages may be formed as tubes secured to the back of the runner. Some of the fluid from the line 58 leading from the cooler 100 may be directed by a by-pass valve 59 into a line 61 connected to the reservoir.