Device ensuring filtration and communication between the atmosphere and the inside of a crankcase

Device ensuring filtration and communication between the atmosphere and a liquid reservoir, such as a crankcase with oil sump, of the type comprising, on the one hand, a housing having an inside cavity and a base equipped with means for securing it on said crankcase, and on the other hand, a filter cartridge placed inside said housing so as to divide said inner cavity into:

• a first chamber communicating with said crankcase through a vertical passageway provided in said base and said crankcase, and
• a second chamber surrounding at least partly said first chamber and communicating with the outside via vents provided in said housing, said cartridge containing a filtering agent placed substantially vertically, device wherein said vents issue into the upper part of said second chamber, the lower part of said second chamber is not directly communicating with the outside, and said device further comprises internal means for recovering and recycling the oil from the filtering agent, which means are interposed between the lower part of said second chamber and said crankcase, branching means being provided for placing said crankcase in direct communication with said second chamber in case of excessive pressure in said crankcase.