Patent GB-190720271-A (GB)
Title: Improvements in or relating to Hydraulic Transmission of Power.
Filed: 1907-09-11
Granted: 1908-05-21
Abstract: 20,271. Siemens-Schuckertwerke Ges. Sept. 12, 1906, [date applied for under Patents Act, 1901]. Delivery, regulating. - Relates to systems of hydraulic transmission of power, in which there are pumps actuated by constant-speed motors and provided with means for altering the rate or direction of flow of the motive fluid, which circulates in a closed circuit. The rotary pump described in Specification No. 18,802, A.D. 1905, [Abridgment Class Rotary engines &c.], comprises a sliding drum which can be moved in relation to its containing casing by a lever, whereby the delivery is regulated. The present invention consists in automatically operating or limiting the operation of this lever or equivalent device according to phase, condition, or demand upon the machine operated by the pump, the control being through the medium of centrifugal governors, cams, and similar apparatus. The position of the controlling-lever may be regulated by cams and tappets, as in Specifications Nos. 9970 and 17,381, A.D. 1902, [Abridgment Class Lifting &c.], so that the speed of a hoisting-cage is reduced as it approaches its stopping place. When it is desired to stop the pump g automatically after a certain number of revolutions of the driven machine m, the controlling-lever h is operated by cams s<1>, s<2> on a shaft s<3> driven by worm gear from the machine m, as shown in Fig. 1. The controlling-lever is prevented from being moved too rapidly by the cams, and the acceleration is thereby limited when the machine is being started or stopped. The electric motor t, Fig. 2, is normally coupled to the pump y and fly-wheel s. When the load continues below the normal for some time, the coupling k and consequently the fly-wheel is put out of engagement by a hand-wheel h<2> and lever h<1>. Simultaneously, limiting-stops h<3> are introduced into the path of the lever h by solenoid apparatus. The limiting- stops are actuated by a centrifugal governor and solenoid in the apparatus shown in Fig. 3. The Specification in the original form as published under the Act of 1901 comprises also other controlling-means. The Figures are numbered as at the date when open to public inspection. Fig. 1 shows a rotary pump g the boss a of which carries the vanes f. The shaft of the boss a is fixedly journaled, while the outer casing may be moved about a pivot for varying the eccentricity. The driven motor m is connected to the pump g by flexible pipes r<1> r<2>. In order that variations of load on the driven machine may not affect the prime-motor, an energy-supplying or energy-storing machine or apparatus may be coupled to the pump. To effect a satisfactory compensation of load, this supplying or storing device is suitably controlled. The driving-motor t, Fig. 2, is regulated by the introduction of a resistance w into its exciting-circuit, according to the amount of energy in the storage device, in this case the fly. wheel S. As shown in Fig. 3, the current supplied to the motor t is governed by a solenoid d, which carries the main motor current and controls a two-pole switch u, thereby introducing an auxiliary motor e into the circuit. An electric energy supply system, which is controlled in accordance with the output of the pump, is shown in Fig. 4. In the pipes r<1>, r<2> are spring-controlled pistons v<1>, v<2> which operate a rod k, which in turn operates the controlling-lever h, and also controls a shunt w in the circuit of an auxiliary machine p. Where the power of the driven machine is very high, the pump may be replaced by several small ones working in series or parallel. The number of pumps in operation can be varied to suit requirements. If several driven machines have independent control pumps, the load variations on these machines can be averaged by coupling the pumps together. The auxiliary machines p<1>, p<2> of the pumps g<1>, g<2>, Fig. 5, are in the same circuit, and, to effect compensation of load, resistances r', r<2> are introduced which depend upon the amount of current used by the prime-motors t<1>, t<2>. This subject-matter does not appear in the Complete Specification as accepted.