| 摘要 |
1507763 Rotary positive displacement fluid machines AUDI NSU AUTO UNION AG 25 Feb 1976 [21 March 1975] 07346/76 Heading F1F In a rotary-piston machine (of trochoidal type, as shown), the piston 9 has a cavity 13 therein with an opening 14 through which coolant is fed in a jet from a nozzle 27 located in a housing side wall 3. The coolant, which also lubricates the bearings 5, 6, 7 is fed by a pump 16 from a sump 17 via passage 19, annular cavity 21, passage 32, valve 30 and passage 29 to nozzle 27 whose outlet 28 is preferably arranged to direct the coolant in the direction of rotation of the piston 9. Valve 30 has a slide 36 acted upon by the coolant pressure, an arm 40 linked to a temperature sensor 45 and an arm 38 linked to an engine throttle control 39 so that the valve 30 allows coolant to pass to nozzle 27 only when the coolant pressure, engine temperature and throttle settings are all above predetermined minimum values. Coolant returns to sump 17 via a passage 34. In a two-piston engine a single nozzle having two outlets supplies coolant to both pistons. |
