GB1453554A - Rotary engine cooling system - Google Patents

Abstract

1453554 Trochoidal-type rotary IC engines; cooling GENERAL MOTORS CORP 5 May 1975 [22 May 1974] 18658/75 Heading F1F Cooling of a two-rotor trochoidal I.C. engine is effected by circulating coolant by means of a pump through first passages 196 in the intermediate heat region of the engine which includes the exhaust ports and then through second passages 198 in the hottest region of the engine which includes the spark-plugs, the outlet of the second passages communicating via manifold 219 with the inlets of a radiator 222 and a heater 230, the outlet of radiator 222 being connected to the pump inlet 192, and the outlet of heater 230 being connected to the inlet 212 of by-pass passages 200 which extend through the coolest region of the engine including the intake ports, there being a heater by-pass passage 220, Fig. 3, which leads from one of the by-pass passages 200 to manifold 219, a thermostat 240 being provided which in the position shown in Fig.3, with the coolant cold, closes connection of manifold 219 with the inlet pipe 228 to radiator 222 whilst leaving open communication between manifold 219 and by-pass passage 200, and which in its other position permits flow to the radiator 222 whilst closing or partially closing off flow to passage 200. Thus coolant flows from pump outlet 194 in end housing 14 via passages 196 to manifold 206 in the other end housing 16 and then back through the engine to manifold 219. When cold, there is no flow to the radiator 222 and flow via nozzle 233 to the heater 230 is effected. To prevent overloading heater 233, coolant can flow via by-pass passage 220 to passage 200 where it is entrained with coolant returned from heater 230 and flows to the pump inlet 192 via manifold 218 to which all said by-pass passages 200 are connected. When hot, flow via passage 220 is at least partially prevented and the main flow is via radiator 222.