Patent ID: 7883621

Claim:
Oil bypass device, comprising a bypass valve in a bypass passage, the bypass valve being adapted to assume the open state in the presence of a differential pressure higher than a particular bypass valve triggering threshold, the oil bypass device being integrated into a connecting sleeve adapted to be fitted to an engine block and to receive an interchangeable engine oil circuit filter, the connecting sleeve having an axial through-passage for conveying oil from the filter to an outlet passage of the engine block and containing the bypass valve and the bypass passage, the bypass passage being adapted to bypass a filter element of the filter, wherein the connecting sleeve comprises: in the axial passage, an inlet bore, an outlet bore with a diameter less than the diameter of the inlet bore, and an intermediate shoulder connecting the inlet bore and the outlet bore, at least one radial passage establishing communication between the inlet bore and an inlet passage of the engine block, a tubular piston mounted so as to slide axially in the inlet bore and pushed against the intermediate shoulder by a return spring to close the radial passage, the tubular piston including, on an outlet section of its exterior surface, an external annular recess with a radial facet which, in a closure position, is in line with the radial passage of the connecting sleeve.