Abstract:
An anti-torque rotor (4) is described for a helicopter (1), comprising: a mast (6) rotatable about a first axis (A); a plurality of blades (8) hinged on the mast (6), extending along respective second axes (B) transversal to said first axis (A) and rotatable about respective said second axes (B) to alter the respective angles of attack; a control element (16) sliding and rotating with respect to the mast (6), and operatively connected to said blades (8) to cause the rotation of said blades (8) about respective second axes (B) following a translation of said element (16) along the first axis (A); a control rod (10) sliding axially along first axis (A) with respect to the mast (6) and angularly fixed with respect to the first axis (A); and a connection element (17) interposed between the control rod (10) and the control element (16), sliding along the first axis (A) with respect to the mast (6) and integrally with the control rod (10); the anti-torque rotor (4) further comprises an interface (18, 93) made of an antifriction material interposed between said control rod (10) and said connection element (17).
Abstract:
Die vorliegende Erfindung betrifft eine Lageranordnung mit einem ersten Lagerring, einem zweiten Lagerring und mindestens einer Wälzkörperreihe mit mehreren Wälzkörpern, die an einer ersten Laufbahn des ersten Lagerrings und an einer zweiten Laufbahn des zweiten Lagerrings abrollbar angeordnet sind, wobei an dem ersten Lagerring mindestens ein hydrostatisch abgestütztes erstes Gleitlagersegment angeordnet ist, das mit einer an dem zweiten Lagerring angeordneten ersten Gleitfläche zusammenwirkt.
Abstract:
Ein Lenksystem umfasst eine in einem Gehäuse (1) längsaxial verschiebbar gelagerte Lenkstange (2) und einen Lenkmotor (5), der über einen Kugelgewindetrieb (6) auf die Lenkstange (2) wirkt, wozu die Lenkstange (2) in zumindest einem Abschnitt ein Kugelumlaufgewinde (7) ausbildet, das über kugelförmige Übertragungselemente (8) mit einer von dem Lenkmotor (5) antreibbaren Getriebemutter (9) zusammenwirkt, wobei die Getriebemutter (9) mittels einer Lageranordnung in dem Gehäuse (1) gelagert ist, wobei ein Getrieberad (10) eines Zugmittelgetriebes, über das eine Antriebsleistung des Lenkmotors (5) auf die Getriebemutter (9) übertragbar ist, mit einem Innenring (16) eines Drehlagers (15) der Lageranordnung verbunden ist. Ein solches Lenksystem ist dadurch gekennzeichnet, dass das Getrieberad (10) mittels einer Kupplung drehmomentübertragend mit der Getriebemutter (9) zusammenwirkt.
Abstract:
The invention relates to a slew bearing (10, 107) comprising a stationary bearing ring (11) to be fixed to a base (3; 106), a moveable bearing ring (12) to be fixed to a moveable object (7; 102), wherein the stationary bearing ring and the moveable bearing ring are configured to enable rotation of the moveable bearing ring relative to the stationary bearing ring about a rotation axis (9). A main axial bearing (20) and an auxiliary bearing (60) are provided between the stationary bearing ring and the moveable bearing ring, wherein the moveable bearing ring comprises one or more main portions (13a) and one or more auxiliary portions (13b), which one or more main portions are moveable relative to the one or more auxiliary portions between an operational position, in which the main axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring, and a maintenance position, in which the auxiliary axial bearing transfers the axial loads between moveable bearing ring and stationary bearing ring and the main bearing is allowed to be inspected and/or maintained so that the slew bearing during inspection and/or maintenance is still operational.
Abstract:
Hybrid Shaft Bearing, Wind Generator Comprising a Hybrid Shaft Bearing, Use of the Hybrid Shaft Bearing and Method of Operating the Hybrid Shaft Bearing. A hybrid shaft bearing (20), a wind generator comprising this hybrid bearing (20), use of the hybrid bearing (20) and a method of operating the hybrid bearing (20) is provided. The hybrid shaft bearing (20) comprises a hydrodynamic journal bearing (22) and a rolling bearing (24). Both bearings (22, 24) cooperate with a support structure (26) and rotatably support a shaft (28). To avoid contact between the sliding surfaces (73, 75) of the hydrodynamic bearing (22) the auxiliary rolling bearing (24) carries the load at low speed, e.g. during start-up and shut-down periods, by ensuring a minimum lubricating gap (71). The hydrodynamic bearing (22) takes over the bearing load when a certain speed of rotation is reached. Active supply of lubricant to operate the journal bearing (22) as hydrostatic bearing at low speed is not required. The bearings (22, 24) may be arranged in paralel or in series.
Abstract:
A bearing assembly includes an outer race having an inner surface defining a concave contour and an inner race positioned in the outer race. The inner race has an inner surface defining a bore therethrough and an outer surface defining at least one groove circumscribing the outer surface. A plurality of rolling elements is rollably located in the groove and is in rolling contact with the inner surface of the outer race. A lubricious liner has an inner liner-surface and an exterior liner-surface, the exterior liner-surface being disposed on the inner surface defining the bore. The lubricious liner has a modulus of compression of a magnitude sufficient to allow misalignment of the inner liner-surface relative to the exterior liner-surface in response to a force applied thereto.
Abstract:
Boîte d'engrenages (61) dans une turbomachine pour l'entraînement en rotation d'au moins un équipement tournant, comprenant un arbre de transmission guidé en rotation dans des paliers (60, 62) et portant une roue dentée (78) en prise avec au moins un pignon d'entraînement (56) en rotation. Un des paliers est un palier à roulement (62) monté à l'intérieur de la roue dentée (78) et dans un plan radial contenant la roue dentée (78) et le pignon d'entraînement (56) et un autre des paliers est un palier lisse (60) de reprise d'efforts de basculement de l'arbre de transmission.
Abstract:
A needle bearing assembly is disclosed which comprises needles (02), sealing means such as a double lip seal (11 ) with a metallic stiffener (15), and a washer (05) within a shell (10). Washer (05) is used between one of the plane surfaces of double lip seal (11 ) having metallic stiffener (15) and the needle surface (09). Washer (05) serves as contact portion for needles (09) and is guided by shell (10).
Abstract:
A cross for a universal joint includes a body including an outwardly extending trunnion and a bearing cup mounted on the trunnion. A thrust washer is disposed between the trunnion and the bearing cup. The thrust washer includes an outer edge portion, a spacer portion that extends from the outer edge portion and is curved in cross sectional shape, a spring portion that extends generally radially inwardly from the spacer portion and is shaped generally in the form of a hollow cone, and an inner lip portion that extends inwardly from the spring portion. The thrust washer absorbs thrust loads that occur between an outer end surface of the trunnion and an inner surface of a closed end of the bearing cup and takes up any axial looseness therebetween.
Abstract:
The present invention refers to a roller bearing particularly suitable for use in seismic isolator, comprising a sliding plate having a substantially circular bottom surface intended for resting and rolling on a layer of balls, a boundary element of the layer of balls substantially ring-shaped surrounding the bottom surface and having an internal knife-shaped edge and a frustoconical ring-shaped interspace for the accommodation and recirculation of the balls open towards the bottom surface.