| 摘要 |
1507762 Rotary positive displacement fluid machines AUDI NSU AUTO UNION AG 25 Feb 1976 [15 March 1975] 07345/76 Heading F1F In a rotary-piston I.C. engine (Wankel-type, as shown), the casing members 1, 3, 4, 5 have passages and cavities defining two separate coolant circuits, the coolant passing through cavities 1b, 3b, 4b adjacent the 'hot' zone of the engine also passing in series through the piston 12. Coolant/lubricant is drawn from a sump 21 by a pump 20 and passed via pipe 22 to shaft bearings 7, 8 and piston bearings 11 and thence to the interior of pistons 12 (a pair shown in Fig. 2). From there the coolant passes into cavities 3b, 4b and then into cavities 1b, exiting via passages 27 to the sump 21. At high speeds and thus high pump output coolant is by-passed via valve 24 and line 23 to cavities 1b to enhance the cooling. The other coolant circuit comprises cavities 1a, 3a, 4a and 5a. In a modification, Fig. 3 (not shown) the coolant leaves cavities 1b via a cavity in the intermediate casing member (30) from which it returns through a stand pipe (31) to the sump. In another modification, Fig. 4 (not shown), the sump has a small collecting reservoir (33) from which the pump draws fluid until the coolant reaches a certain temperature at which the collecting reservoir and remainder of the sump are placed in communication. |
