Hydac Filtertechnik Gmbh

Zf Friedrichshafen Ag

Volkmar Klein

Michael Otto Sakraschinsky

Norbert Sann

Paul Lenz

Stefan Hennes

Klaus Alesch

Armin Schmidt

Claudia Brocker

Nobert Sann

Joel Daub

A filter device for the filtration of fluids has a filter housing (), which can be closed by a cover (), and has a filter element () accommodated in a replaceable manner in the filter housing. At least one functional element is present on the cover () and on the filter housing () and on the filter element () in such a way that the filtration of the fluid is only possible when all functional elements interact simultaneously.

Filter device together with filter element

A filter device has a filter housing () and a filter element () accommodated in the filter housing. The element material () of the filter element for filtering a liquid extends between two end caps (). At least one end cap () is mounted on an element receptacle (). A bearing (), providing more than one degree of freedom, is used to articulate the filter element () on the element receptacle () via its one end cap (). The bearing has a convex bearing surface () that is guided in a concave bearing surface (). The respective bearing surface () is part of a respective shell (). At least one shell () has a passage () for liquid media.

Filter device with an element receptacle having two or more degrees of freedom relative to different axes

A filter element for fluid filtration, in particular for hydraulic fluid, has element components, such as pleated and multi-layer filter material () that extends between two end caps () and has a fluid-permeable supporting tube () forming a hollow cylinder. At least one element component of the filter element is provided at least partially with at least one luminescent material or marker such that the material or marker is excited to a characteristic, detectable wave emission when exposed to a certain exciter wave or wave spectrum.

Filter element with a luminescent marker

A filter device has a filter housing () with a filter head (), a filter pot () and a removable housing cover part () and has a filter element () separating a non-filtrate side () from a filtrate side () in the housing. A bypass valve device has a valve closure element () preloaded by a closing spring () into a closed position in which it bears against a valve seat part (). If the filter element () is blocked, the closure element opens up a fluid path from the non-filtrate side () to the filtrate side (), by passing the filter element (). The valve closure element () and the closing spring () are on the cover part (). The valve seat part () is on an element cap () of the filter element (). The element cap has a receiving part () forming an enclosure for that end of the filter material () of the filter element () facing toward the cover part ().

Filter device

A filter apparatus includes a filter housing having a filter head () and a filter bowl (). The housing accommodates a filter element that separates a non-filtrate side () from a filtrate side (). A differential pressure measurement device () indicates at least a blockage of the filter element during filtration operation and has a measurement piston () that is guided in a measurement housing () in a longitudinally displaceable manner. An end face () of that piston is subjected to the instantaneous pressure of the non-filtrate side (). The opposite end face of the piston is subjected to the instantaneous pressure of the filtrate side (). Each instantaneous pressure passes into the measurement housing () via at least one conduit (). At least a section () of the conduit is arranged in an element cap () of the filter element.

Filter apparatus

An assembly forms a seal between components () having sealing zones (). The sealing zones face each other in a functional position of the components. A sealing element () is on the sealing zone () of one component (). A sealing surface () is on the sealing zone () of the other component () to form a radial seal. The components () can be brought into the functional position by a relative movement in the axial direction. The sealing element () sealingly interacts with the sealing surface () in the functional position. A third component () associated with an actuating part () acts on the sealing element () in the functional position of the components () to deform the element to increase the sealing force.

Arrangement for forming a seal

A system for ventilating and venting containers containing a fluid volume, such as gearboxes containing an oil filling, has a line system connecting the container to the atmosphere. Upon changes in the volumes in the container due to temperature changes, pressure is equalized. The line system contains a separating housing () in which a separating medium () having oleophobic and hydrophobic properties separates a first space () connected to the container from a second space () connected to the atmosphere. Line connections () on the separating housing () are provided such that liquid-phase substances on opposite sides of the separating medium () can flow out of the first space () to the container and can drain out of the second space () to the atmosphere.

System for ventilating and venting containers containing a fluid volume

A filter device includes at least one filter element () housed in a filter housing () and connected for the flow of fluid by fluid connections () to a fluid device, in particular in the form of a hydraulic tank (), using a connector device (). A plunger valve arrangement is achieved, whereby the connector device () is provided with at least one longitudinally-displaceable blocking piece (). In the blocking position, the blocking piece blocks the provided fluid connections (). After displacement into an open position, it releases the fluid connections. A blocking or releasing of the fluid connections in a rapid operation process is permitted to carry out a filter element exchange for the used filter medium.

A non-return valve includes a valve body () which defines an internal fluid through-opening () extending along the longitudinal axis () of the body. A seat body () defines a valve seat () arranged in the through opening (). A closing body () is axially displaceable in the through opening () oppositely to a closing force produced by a closing spring () between a closed position applied to the seat body () and an open position lifted from the valve seat () on the closing body (). The valve body () forms a guide along which the seat body () is axially displaceable in different adjusting positions corresponding to the desired preloads of the closing spring () and, consequently to the desired adjustments of the closing force quantity of the closing spring ().

Non-return valve

A filter device includes at least one filtering element arrangeable in a filter housing () connectable to a hydraulic device (), in particular a hydraulic tank. The tank is connectable to the filter housing through hydraulic connections () by a connection system in such a way that a fluid is enabled to circulate. The filter housing is removably mounted on the hydraulic device () by a fixing unit. The fixing unit is embodied in the form of a bayonet fitting () which is lockable and detachable by the filter housing () rotation. The connection system has at least one movable locking element which locks in the locking position the hydraulic connection () associated with it, and releases the connection after displacement in the open position. The locking element is displaceable in a sealing or opening position by rotational motions of the housing () for detaching and locking the bayonet fitting ().

A filter device has a filter housing part () with a filter element () and can be detachably connected to another filter housing part (). A valve () clears a fluid path in the interconnected state of the housing parts () with the filter element, and in the separated state of the housing parts () from one another or without the filter element at least partially blocks it. Instead of known quarter-turn fastener and stopper solutions, a blocking is devised which can be economically implemented and which requires decidedly less installation space. A process for operation of a filter device is also provided.

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Zweibrücken, Germany

Volkmar Klein