A scroll type fluid machine is provided with a mechanism for injecting oil into fluid working chambers such that a precise amount of oil is supplied without using any capillary tube, instead using intermittent oil feed from an oil sump through a communicating passage into the working chambers. Within...http://www.google.de/patents/US5249941?utm_source=gb-gplus-sharePatent US5249941 - Scroll type fluid machine having intermittent oil feed to working chamber
