Abstract:
In a mould arrangement having at least a first mould part and having at least one movably held second mould part, in particular for producing rotor blades for wind power plants, and having at least one pivoting device for the second mould part, said second mould part can be moved by means of the pivoting device out of a position next to the first mould part and into at least a congruent position over the first mould part. The pivoting device has at least one support element which is held in a movable manner about a first rotary bearing and is equipped with a second rotary bearing for the second mould part to tilt about the second rotary bearing, wherein at least the first rotary bearing of the pivoting device is arranged in a manner spaced apart from the standing surface of the first, fixed mould part.
Abstract:
A hydraulic dashpot has a cylinder housing (1), a piston (3), means for regulating the outflow of oil from the oil and piston chamber (2), so as to attenuate the kinetic energy applied on the piston, an oil return valve and an elastic force (22) which presses the piston (3) back into its initial position. A spiral damping groove (35) which extends in the axial direction is arranged on the skirt (34) of the piston (3). An endless, coaxial oil draining groove (6) which is completely covered by the piston (3) in the initial position of the piston (3) is arranged on the inner area (4) of the envelope of the oil and piston chamber (2, 2.2).
Abstract:
Vorgeschlagen wird eine Dichtungsanordnung (1) zum Abdichten eines Arbeitsraumes (8), der von einem konzentrisch gegen ein äusseres Maschinenteil (3) beweglichen inneren Maschinenteil (4) und dem äusseren Maschinenteil (3) gebildet wird, mit einer Hülse (10) in der ein Schmiermittelraum (11) ausgebildet ist, wobei der Schmiermittelraum (11) durch einen arbeitsraumseitigen asymmetrischen Dichtring (20) und einen arbeitsraumabgewandten asymmetrischen Dichtring (21) abgetrennt ist, wobei die Dichtringe (20, 21) derart angeordnet sind, dass beim Betrieb der Maschinenteile (3, 4) mit der, zwischen dem äusseren und dem inneren Maschinenteil (3, 4) angeordneten, Dichtungsanordnung (1) ein Schmiermittel is vom Arbeitsraum (8) in den Schmiermittelraum (11) eingefördert wird und wobei die Hülse (10) eine Ventilvorrichtung (30) zur Überdruckentlastung des Schmiermittelraums (11) aufweist.
Abstract:
A sealing system (12) for a hydraulic actuator (10) operable to selectively change the frictional sealing force exerted on a piston rod (22) in response to fluid pressure acting on the sealing system. A first seal member (72) operable for permitting a predetermined amount of fluid to leak from working chamber (16) to leakage chamber (76). A flow control valve (84) controls the flow of fluid from the leakage chamber (76) to a reservoir (86). A pressure responsive seal assembly (90) is operable to inhibit leakage of fluid from the leakage chamber (76) to the exterior of the hydraulic actuator (10) and is energizable in response to an increased fluid pressure within the leakage chamber (76) for generating increased frictional engagement with the piston rod (22) for preventing the vehicle body to sink during an extended stationary period of time. Furthermore, the pressure responsive sealing assembly (90) generates a reduced frictional engagement with the piston rod (22) when fluid pressure in the leakage chamber (76) is relatively low.
Abstract:
A gas spring having a cylinder (11), a piston (16) within the cylinder (11) and a piston rod (17) projecting out of the cylinder. A seal between the rod and cylinder is formed by a cup-shaped member (59) presenting an inwardly-projecting skirt (63) that functions as a one-way check valve. A second or inner seal (65) may be optionally placed within the cup-shaped member to form a lubricant-retaining chamber.
Abstract:
A gas shock absorber has a pressure tube which defines a working chamber. A piston assembly divides the working chamber into an upper working chamber and a lower working chamber. A plurality of extension passages extend through the piston assembly and are opened and closed by an extension valve assembly. A plurality of compression passages extend through the piston assembly and are opened and closed by a compression valve assembly. A rod guide assembly is located between the pressure tube and the piston rod. The rod guide assembly includes an oil chamber for sealing and lubricating the piston rod. An axially movable piston maintains the pressure within the oil chamber equal to the pressure in the upper working chamber.
Abstract:
Swinging gas spring provided so that, even in a "rod up" position, oil or another liquid is durably confined against the conventional seal surrounding the piston rod at the outlet of the cylinder. A secondary annular seal (42) which also surrounds the piston rod (5) is associated to said seal (2) of the rod guiding bottom (1) on the inner side and spaced from the latter in order to delimit therewith an inter-seal space (61) which is filled with oil each time the gas spring is in a "rod down" position and which retains said oil thus effectively trapped when the gas spring is "rod up", the piston (3) or its rod (5) being to this effect integral with a cam means (31) which, when at right angles with said secondary seal (42), spaces apart its internal lip from the surface of the piston rod (5), thereby providing a free passage for the oil along said surface towards said inter-seal space (61). Application to the car industry.
Abstract:
Ein Gaszylinder, insbesondere Hochdruck-Gaszylinder, dessen Zylinderrohr (1) eine Kolbenstange (9) aufweist, die durch eine Dichtungsanordnung (13) hindurchgeführt ist, die den im Druckraum (23) des Zylinderrohres (1) herrschenden Gasdruck gegen den Umgebungsdruck abdichtet, ist dadurch gekennzeichnet, dass die Dichtungsanordnung (13) zwischen mindestens einem dem Druckraum (23) benachbarten Dichtelement (31) und mindestens einem weiteren, vom Druckraum (23) weiter entfernten Dichtelement (35) einen Druckölraum (33) aufweist, in den mittels einer Versorgungseinrichtung (51) Öl unter einem Druck einpressbar ist, der gleich oder höher als der im Druckraum (23) des Zylinderrohres (1) jeweils herrschende Gasdruck ist.