to reduce the pressure drop at the fluidpassage and reservoir for hydraulic systems for circulation of a fluid

摘要

PCT No. PCT/SE89/00098 Sec. 371 Date Aug. 2, 1990 Sec. 102(e) Date Aug. 2, 1990 PCT Filed Mar. 3, 1989 PCT Pub. No. WO89/08783 PCT Pub. Date Sep. 21, 1989.In mobile hydraulic systems there is used a fine-mesh net structure (7) in a reservoir (6) for extracting air from the hydraulic fluid. When the system is started-up under cold-start conditions, a high pressure drop will prevail across the net structure, due to the viscosity of the fluid under such conditions. To overcome the problems associated herewith, a constricted passageway is provided in the net structure or adjacent thereto, such as to effect viscosity-dependent shunting of the fluid. This constricted passageway may have the form of a hole (11). A diffusor (13) may optionally be arranged in the reservoir, to ensure that the fluid will have laminor flow. A constricted passageway (11) of the aforesaid kind may also be provided in or adjacent to the diffusor (13).