Hydraulic fluid filter device
AssigneeFSP-Holding AG
InventorHans Reinhardt
Life of this patent
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Abstract
A filter device for filtering hydraulic fluid includes first and second subelements 40, 42 within a filter housing having separate inflows 20, 24 thereto for the respective subelements and a common outflow 22. The first subelement has a higher filter fineness than the second subelement. Several bypass configurations are taught and include: (i) a bypass line 28 for bypassing the second subelement by drawing fluid directly from the supply 95; (ii) a bypass valve 116 (FIG. 3) for bypassing the first subelement; and (iii) a bypass valve 151 (FIG. 5) for connecting the first subelement inflow 20 with the common outflow 22. The device is compact, has an easy-to-service arrangement, and ensures protection of a hydraulic pump and highly stressed hydraulic components.
Claims22
A filter device for filtering a hydraulic fluid, with a filter housing in which a filter element is disposed, characterized in that the filter element comprises a first and a second subelement, the first subelement having a higher filter fineness than the second subelement and both subelements being insertable through a common insertion opening into the filter housing, and in that it is possible for hydraulic fluid to be fed to each subelement via a separate supply inflow the filter housing and for filtered hydraulic fluid to be discharged from both subelements via a common outflow in the filter housing.
A filter element for a hydraulic fluid filter device, said filter element comprising:
- a first subelement and a second subelement, the first subelement having a higher filter fineness than the second subelement;
- wherein:
- the first and second subelements are insertable through a common insertion opening into a filter housing of the filter device;
- separate respective supply inflows in the filter housing for each subelement allow hydraulic fluid to be fed to each subelement;
- and
- a common outflow in the filter housing enables the discharge of filtered hydraulic fluid from each subelement.
Dependencies are inferred from the claim text.