| 摘要 |
995,289. Centrifugal pumps. TWIN DISC CLUTCH CO. Aug. 24, 1962 [May 15, 1962], No. 32700/62. Heading F1C. [Also in Divisions F2 and G3] A constant speed electric motor 10 drives a shaft 11 with a hub 12 embodying an annular cylinder 14 housing an annular piston 15, rightward movement of which engages a clutch 16; alternate clutch plates are attached to the hub 11 and a spider 18 that is connected to a centrifugal pump 19, the outlet 22 of which leads to a distribution system. The, motor also drives another pump 23 which draws oil from a sump 24 and delivers it to a valve chamber 27 incorporating a pressure-regulating valve 32 and a modulating valve 33 comprising a piston closure 38 having a spindle 39 partially enclosed in a diaphragm 40, the rear of which is open to the centrifugal outlet 22. When the pump 23 is driven the valve 32 is unseated and enables the fluid in chamber 26 to flow through a passage 54 and hub channels 55, 56, 57 so cooling the clutch plates. With the valve 33 in the position shown fluid from chamber 26 also flows to the cylinder 14 via a passage 45, an annular groove 46 around the bore for the valve 33, a passage 47, and hub channels 49, 50, 51. Rising pressure in the outlet 22 causes leftward motion of the closure 38 which results in uncovering of groove 46 whereby fluid from passage 45 flows into passage 54 so that the pressure on piston 14 is relieved and the speed of the centrifugal pump is reduced. |
