Patent ID: 6613221
Filing Date: 2003-09-02
Classification: B01D

Abstract:
Sieve filter for fluid conduits, comprising a hollow cylindrical main body (3, 3â€²) with a fluid inlet (4, 4â€²) and a fluid outlet (5, 5â€²), and a fine mesh filter element (6, 6â€²) adapted to allow fluid flow therethrough,the fluid outlet (5, 5â€²) of the sieve filter (1, 1â€²) is operatively connected to a spring element (7), and the sieve filter (1, 1â€²) together with the spring element (7) are insertable between two axially spaced opposing surfaces (8, 9) inside a fluid conduit (2), the fluid inlet (4, 4â€²) of the sieve filter (1, 1â€²) and the spring element (7) are prestressed against the opposing surfaces (8, 9) and the main body (3, 3â€²) of the sieve filter (1, 1â€²) is movable axially between the opposing surfaces (8, 9), whereby when the filter element (6, 6â€²) is subject to normal fluid through flow, the main body (3, 3â€²) of the sieve filter (1, 1â€²) is arranged so that a separate fluid bypass line that bypasses the filter element (6, 6â€²) of the sieve filter (1, 1â€²), is closed, and when the filter element (6, 6â€²) is stopped up or filtering highly viscous fluid, an axial displacement of the main body (3, 3â€²) of the sieve filter (1, 1â€²) takes place against the force of the spring element (7) resulting from a rise of fluid pressure on the filter element (6, 6â€²), wherein the conduit (2) is an oil pressure line which provides an oil channel to a device (10) for relative rotation of a camshaft (11) in relation to a crankshaft of an internal combustion engine, and the sieve filter (1, 1â€²) is arranged directly before an electromagnetic control valve (12) of the device, a cylindrical valve element (13) of the device is located inside an insertion bore hole (14) which is incorporated into a cylinder head (15) of the internal combustion engine or a valve housing (16) fastened on the cylinder head (15) of the internal combustion engine, the pressure line (2) opens axially into the insertion bore hole (14), which has a greater diameter than the pressure line to form a step-like shoulder that forms the one opposing surface (8) for the fluid inlet (4, 4â€²) of the sieve filter (1, 1â€²), and a face or an annular surface of the valve element (13) of the electromagnetic control valve (12) forms the second opposing surface (9) upon which the spring element (7) acts.