EP0287527A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multiple lubricating oil filter for internal combustion engines, with a member for monitoring the degree of clogging of the filtration surface
Assignee: Ital Idee SRL
•
Filing: 1988-04-11
•
Granted: —
•
Expires: 2008-04-11
Abstract
Abstract The filter according to the invention comprises an outer casing (1) which is provided with an end cover (5) having means (4) for connection to the engine lubrication circuit, and which houses a first filter pack or element (2) positioned to be traversed by the engine lubricating oil, there being provided a pressure relief valve (6) which prevents the oil passing through the first filter pack or element (2) in the case of excessive pressure drop, the pressure relief valve (6) cooperating with a piston element (13) associated with an electrically conducting spring (11) to establish electrical connection between a point of contact (12) and a part of the filter casing (1), a second filter pack or element (3) being positioned to filter part of the oil which the pressure relief valve (6) allows to pass in the case of high pressure drop in the oil flow through the first filter pack or element (2).
Inventors
- 👤 Angelo Cantoni
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 12:23
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/10; B01D27/101; B01D27/103; B01D27/106; B01D27/108; B01D27/14; B01D27/142; B01D27/144; B01D2201/00; B01D2201/20; B01D2201/204; B01D2201/208; F; F01; F01M; F01M1/00; F01M1/10; F01M2001/105; F01M2001/1057
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A multiple lubricating oil filter for internal combustion engines, with a member for monitoring the degree of clogging of the filtration surface, characterised by comprising a casing (1) provided with an end cover (5) having means (4) for connection to the engine lubrication circuit; a first filter pack or element (2) placed inside said casing (1) and positioned so as to be traversed by the engine lubricating oil; a pressure relief valve (6) arranged to prevent said lubricating oil passing through the first filter pack or element (2) in the case of excessive pressure drop, the pressure relief valve (6) cooperating with a piston element (13) associated with an electrically conducting spring (11) to establish electrical contact between a point of contact (12) and a part of the filter casing (1); a second filter pack or element (3) being positioned to filter part of the oil which the pressure relief valve (6) allows to pass when the first filter pack or element (2) is clogged.
Claim 2
Dependent Claim
165 words
A multiple lubricating oil filter for internal combustion engines, with a member for monitoring the degree of clogging of the filtration surface, characterised by comprising a casing (1) provided with an end cover (5) having means (4) for connection to the engine lubrication circuit; a first filter pack or element (2) placed inside said casing (1) and positioned so as to be traversed by the engine lubricating oil; a pressure relief valve (6) arranged to prevent said lubricating oil passing through the first filter pack or element (2) in the case of excessive pressure drop, the pressure relief valve (6) cooperating with a piston element (13) associated with an electrically conducting spring (11) to establish electrical contact between a point of contact (12) and a part of the filter casing (1); a second filter pack or element (3) being positioned to filter part of the oil which the pressure relief valve (6) allows to pass when the first filter pack or element (2) is clogged.
Claim 3
Dependent Claim
88 words
A multiple filter according to claim 1, characterised by comprising a Venturi tube element (8) in the lubricating oil return line to the engine, the arrangement being such that part of said return oil to the engine passes through said second filter pack or element (3) by the effect of the dynamic pressure different between the Venturi tube inlet mouth and the Venturi tube vacuum region, so that a certain percentage of the return oil to the engine is filtered by the second filter pack or element (3).
Claim 4
Dependent Claim
39 words
A multiple filter according to claim 1 or 2, characterised by comprising spring (17, 17a) operating non-return valves (16, 16a) located in correspondence with the filter lubricating oil inlet port and with the filter lubricating oil outlet port respectively.
Claim 5
Dependent Claim
35 words
A multipile filter according to claim 1, characterised in that the point of contact (12) is mounted in an insulating support (10) which is itself mounted on the filter casing (1) in a sealed manner.
Claim 6
Dependent Claim
43 words
A multiple filter according to claim 1, characterised in that, by means of a preset spring (7), the pressure relief valve (6) is normally retained in the closed position, which enables lubricating oil to pass through the first filter pack or element (2).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.