Abstract:
A roller bearing apparatus (100) includes a rotor (102; 104) having first superhard raceway elements (110; 122) distributed circumferentially about an axis (114). Each first superhard raceway element includes a raceway surface (118; 124) configured to form a first portion of a raceway. The apparatus includes a stator (104; 102) including second superhard raceway elements (122; 110) generally opposed to the first superhard raceway elements (110; 122). Each second superhard raceway element includes a raceway surface configured to form a second portion of the raceway. The apparatus includes rolling elements (128) interposed between the rotor and stator and positioned and configured to roll on the raceway. One or more of the rolling elements may be configured to elastically deform on the raceway during use. At least a portion of the raceway exhibits a first modulus of elasticity at least 3 to 50 times greater than a second modulus of elasticity of at least a portion of the one or more of the rolling elements.
Abstract:
A bearing structure, for example of a needle roller bearing, has an outer surface defined in part by a composition comprising a first polymeric material having a Rockwell hardness (m scale) in the range 80 to 130. Preferred materials are polyaryletherketones, for example polyetheretherketone.
Abstract:
A method of improving the performance and service life of a new bearing component (1), the component having at least one dynamic frictional surface the method includes subjecting the at least one dynamic frictional surface to a surface finishing operation thereby providing the surface roughness value R A of approximately 18-80 μin, preferably greater than 24 μin, and most preferably 30-36 μin. The method is particularly advantageous when applied to bearing components (1) utilized in high-load, low rpm applications.
Abstract:
The invention refers to a bearing unit and a method for its manufacture incorporating an outer race ring (1), an inner race ring (4) having an inner envelope surface with an axially tapering saw-tooth profile (6), a thin-walled axially slotted sleeve (7), having a tapering saw-tooth profile (9) on its outer envelope surface, cooperating with the saw-tooth profile (6) in the inner race ring (4) for increasing and decreasing the grip of the thin-walled sleeve against a shaft, when inner race ring (4) and sleeve (7) are mutually displaced, a flange (10) connected to the sleeve (7) and having tightening means (11) operable to cause the displacement between sleeve (7) and inner race ring (4), rolling bodies (12) positioned between inner and outer race rings, wherein the surface of the inner race ring (4) presenting the tapering saw-tooth profile (6) has been subjected to a turning operation followed by hardening.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung von innen- und/oder aussenprofilierten Ringen (6), insbesondere von Wälzlagerringen und Getrieberingen in komplett schleiffertigem Zustand aus Rohr- oder Vollmaterial (1), bei dem spanende Verfahren wie Drehen und umformende Verfahren wie Radial-Axial-Profilrohrwalzen und/oder Walzeinstechen in Folge und/oder parallel miteinander kombiniert werden, dadurch gekennzeichnet, dass während dem Walzen des Profiles eine Gegenkraft bezüglich der Fliessrichtung des Rohrmaterials (1) erzeugt wird, womit der Werkstofffluss in axialer und/oder radialer Richtung so steuerbar ist, das der ausweichende Werkstoff in die Ausbildung des Profiles einbezogen wird. Mit der Erfindung wird eine Fertigungsmöglichkeit für z. B. Synchron-Getrieberinge und Schaltmuffen durch die Verfahrenskombination Radial-Axial-Profilrohrwalzen - Drehen angegeben, welche die bisher nicht in jedem Fall mögliche Erzielung der notwendigen Genauigkeitsanforderungen garantiert. Durch Einsatz des Radial-Axial-Profilrohrwalzens ergeben sich Fertigungsmöglichkeiten für die Herstellung eines weitaus grösseres Teilespektrums als mit den bisher bekannten Verfahren bzw. Lösungen. Für die maschinentechnische Umsetzung des Verfahrens ist eine Anordnung beschrieben.
Abstract:
A rolling bearing characterized in that at least the fixed side bearing ring thereof has a lower bainite structure formed by isothermal transformation treatment, a hardness of a HRC of 54 to 64, an amount of retained austenite of 5 % or less, and an area percentage of carbide particles having a length of 0.8 mu m or more relative to the total secondary eutectoid carbide area of 20 % or less. The rolling bearing is reduced in the occurrence of white layers.
Abstract:
A bearing assembly (10) having concentrically supported inner and outer relatively rotatable races (11, 12) with a pair of endplates (15) secured to the inner race for limiting relative lateral movement between the races. The endplates are secured to the inner race by solidified metal (30) which is applied to the endplates and to the inner bearing race in molten form and which upon solidification secures the endplates in fixed relation to the bearing race. A method of manufacture is disclosed which involves injecting molten zinc between respective annular seating surfaces (15b, 20b) defined by the endplate and inner bearing race.