To "slew" means to turn without change of place. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill. In other orientations (e.g. a horizontal axis of rotation) they are used in materials handling grapples, forklift attachments, welding turnover jigs and so on.
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| - Drehwerk (de)
- Ralla (meccanica) (it)
- 旋回ベアリング (ja)
- Łożysko wieńcowe (pl)
- Slewing bearing (en)
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| - Ein Drehwerk, auch Drehkranz genannt, ist in der Technik und dem Maschinenbau ein Verbindungselement zum Übertragen von Drehbewegungen bei einer gleichzeitigen Sperrung der restlichen 5 Freiheitsgrade (3 Translationen, 2 Rotationen). Dabei muss diese Lagerung meist sehr große Axialkräfte übertragen und Kippmomente aufnehmen. Klassische Anwendungsfälle sind das Drehwerk bei Kranen oder Baggern sowie die drehbare Lagerung der vorderen Achse an der Deichsel eines LKW-Anhängers. (de)
- 旋回ベアリング（せんかいベアリング）は、クレーンや油圧ショベルのような大型の旋回構造を持つ機械において、旋回部分を支える部品である。旋回ベアリングは、軸方向の荷重を支えながら滑らかに回転することが要求されるので、スラスト軸受の一種である。それに加えて、曲げモーメント（荷重による旋回体の倒れ）にも耐える構造を備えていることが多い。 (ja)
- Łożysko wieńcowe – jest to łożysko toczne, wielkogabarytowe (o średnicy wewnętrznej powyżej 0,3 m), charakteryzujące się tym, iż pierścienie łożyskowe są tak ukształtowane, że pozwalają na mocowanie ich za pomocą śrub bezpośrednio do dwóch części nośnych urządzenia (korpusu maszyny) – jednego obrotowego, a drugiego stałego. Bardzo często jeden z pierścieni stanowi wieniec zębaty (stąd pochodzi nazwa tego łożyska). (pl)
- To "slew" means to turn without change of place. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill. In other orientations (e.g. a horizontal axis of rotation) they are used in materials handling grapples, forklift attachments, welding turnover jigs and so on. (en)
- La ralla è un tipo di cuscinetto assiale per impieghi a bassa velocità di rotazione e alto carico assiale. La costruzione può essere a una o più corone di sfere, oppure a una o più corone di rulli. Oltre al carico assiale, a seconda del tipo, può sopportare anche momento flettente e/o carico trasversale. Può essere costruita con corona dentata interna, esterna o senza corona dentata. La ralla reggispinta è una ralla, normalmente da montare in uno spazio assiale limitato (quindi in condizioni di manutenibilità scarse), che assorbe e trasmette le forze assiali di tipo unidirezionale. (it)
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| - Ein Drehwerk, auch Drehkranz genannt, ist in der Technik und dem Maschinenbau ein Verbindungselement zum Übertragen von Drehbewegungen bei einer gleichzeitigen Sperrung der restlichen 5 Freiheitsgrade (3 Translationen, 2 Rotationen). Dabei muss diese Lagerung meist sehr große Axialkräfte übertragen und Kippmomente aufnehmen. Klassische Anwendungsfälle sind das Drehwerk bei Kranen oder Baggern sowie die drehbare Lagerung der vorderen Achse an der Deichsel eines LKW-Anhängers. (de)
- To "slew" means to turn without change of place. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill. In other orientations (e.g. a horizontal axis of rotation) they are used in materials handling grapples, forklift attachments, welding turnover jigs and so on. Compared to a "normal" ball bearing the rings are quite wide and usually have holes drilled in them to provide fixation to a structure. Seals can be provided between the rings to protect the rolling elements. Compared to other rolling-element bearings, slewing bearings are relatively thin section and require that the structure to which they are bolted is stiff enough so that under load predefined limits of distortion are not exceeded. Slewing rings range in size from as little as 100mm diameter to well over 15 000mm (often segmented at this size for easy transport and handling); for example the bearings on the Falkirk Wheel are 4 meters diameter and fit over a 3.5 meter axle. Slewing bearings are often made with gear teeth integral with the inner or outer race (or both in rare cases) used to drive the platform relative to the base (for example in winches). Slewing bearing designs range from single row ball or roller style, through double row ball or roller, triple row roller, combined (1 roller/ 1 ball) or wore guided raceways - each design having its own special characteristics and application. Old designs can have split rings to allow tight control on preload during assembly. As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used. (en)
- La ralla è un tipo di cuscinetto assiale per impieghi a bassa velocità di rotazione e alto carico assiale. La costruzione può essere a una o più corone di sfere, oppure a una o più corone di rulli. Oltre al carico assiale, a seconda del tipo, può sopportare anche momento flettente e/o carico trasversale. Può essere costruita con corona dentata interna, esterna o senza corona dentata. La ralla reggispinta è una ralla, normalmente da montare in uno spazio assiale limitato (quindi in condizioni di manutenibilità scarse), che assorbe e trasmette le forze assiali di tipo unidirezionale. Alcuni impieghi sono:
* Escavatori
* Gru
* Autoveicoli (ralle di sterzo)
* Piattaforme
* Robotica
* Generatori eolici
* Radar
* Impianti per Luna Park
* Carrelli elevatori
* Macchine per imballaggio
* Imbottigliatrici
* Tavole girevoli
* Macchine utensili
* Argani
* Trattamento acque
* Caroselli pluristazione
* Strumentazione medicale
* Torrette girasiviera
* Forni EAF e LF (it)
- 旋回ベアリング（せんかいベアリング）は、クレーンや油圧ショベルのような大型の旋回構造を持つ機械において、旋回部分を支える部品である。旋回ベアリングは、軸方向の荷重を支えながら滑らかに回転することが要求されるので、スラスト軸受の一種である。それに加えて、曲げモーメント（荷重による旋回体の倒れ）にも耐える構造を備えていることが多い。 (ja)
- Łożysko wieńcowe – jest to łożysko toczne, wielkogabarytowe (o średnicy wewnętrznej powyżej 0,3 m), charakteryzujące się tym, iż pierścienie łożyskowe są tak ukształtowane, że pozwalają na mocowanie ich za pomocą śrub bezpośrednio do dwóch części nośnych urządzenia (korpusu maszyny) – jednego obrotowego, a drugiego stałego. Bardzo często jeden z pierścieni stanowi wieniec zębaty (stąd pochodzi nazwa tego łożyska). (pl)
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