US 4,885,082 AGranted

Multiple lubricating oil filter for internal combustion engines, with a member for monitoring the degree of clogging of the filtration surface

AssigneeItal Idee s.r.l. an Italian Limited Liability Company

InventorAngelo Cantoni

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Abstract

The filter according to the invention comprises an outer casing which is provided with an end cover having a connection to the engine lubrication circuit. The outer casing houses a first filter pack or element positioned to be passed through by the engine lubricating oil. A pressure relief valve, which allows the oil to bypass the first filter pack or element in the case of excessive pressure drop, is provided. The pressure relief valve cooperates with a piston element associated with an electrically conducting spring to establish electrical connection between an electrical contact and a part of the filter casing. A second filter pack or element is positioned to filter part of the oil which the pressure relief valve allows to pass when a high pressure drop in the oil flow through the first filter pack or element occurs.

Claims5

Dependent claims

A multiple lubricating oil filter for internal combustion engines, with a member for monitoring the degree of clogging of the filtration surface, comprising:

a casing provided with an end cover having means for connection to an engine lubrication circuit;
a first filter pack placed inside said casing and positioned so as to be passed through by engine lubricating oil;
a pressure relief valve arranged so as to allow the lubricating oil to bypass the first filter pack when an excessive pressure drop occurs, the pressure relief valve including a non-conducting piston element which rests on an electrically conducting spring arranged so as to establish an electrical point of contact between the spring and a metal electrical contact connected to a part of the filter casing;
and
a second filter pack being positioned inside said casing to filter part of the oil which the pressure relief valve allows to pass when the first filter pack is clogged.

2 more elements

Dependencies are inferred from the claim text.