Bearings – Rotary bearing – Hydraulic or pneumatic bearing support
Patent
1999-05-11
2000-08-29
Footland, Lenard A.
Bearings
Rotary bearing
Hydraulic or pneumatic bearing support
384569, 384581, F16C 3358
Patent
active
061097918
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a rolling bearing having at least one race ring which is configured as a composite hollow ring comprising a first ring element in contact with rolling elements and a second ring element surrounding the first ring element, a gap filled with fluid being arranged between both ring elements.
BACKGROUND OF THE INVENTION
A silenced bearing of the pre-cited type is known from DE 41 34 604 A1. This bearing has a race ring configured as a hollow ring which consists of an outer ring element and an inner ring element with an oil-filled gap arranged between the two ring elements. In this way, the hollow ring is interrupted by a film of fluid so that the raceway noises caused on the raceway by the rolling elements are damped by the fluid film.
It is true that a damping of noise is accomplished in such a bearing but the reason for the noise, i.e. the occurrence of vibrations in the bearing due to self-movements of the mounted element is not eliminated.
SUMMARY OF THE INVENTION
The object of the invention is therefore to create a silenced bearing which, as far as possible, completely excludes the sources of noise while, at the same time, avoiding the drawbacks of the prior art.
The invention achieves this object according to the characterizing part by the fact that the first ring element is configured as a thin-walled bushing of uniform wall thickness whose raceway comprises, in at least one peripheral section, an elastically yielding raceway convexity deviating from its circular shape so that at least one of the rolling elements is radially pre-stressed between the raceway convexity and a raceway situated opposite thereto.
Due to this non-circular shape, a defined pre-stress can be applied to the shaft so that this is rendered free of play and has only a slight possibility of self-movement with the result that annoying noises are not even produced in the first place. The elastic properties of the raceway convexity must be chosen so that, on the one hand, a sufficiently high pre-stress is obtained on the shaft while, on the other hand, a slight self-movement of the shaft in radially outward direction is possible by a neutralization of the elasticity of the raceway convexities. An additional damping of the bearing by the oil-filled gap between the first and the second ring element of the hollow ring is produced when the elastic raceway convexities are pressed radially outwards by the mounted shaft.
The level of the pre-stress applied to the shaft is determined by the material used for making the thin-walled bushing and by its wall thickness. The larger the wall thickness of the material used, the higher the level of the pre-stress on the shaft. The elasticity of the normally used steel materials is also influenced by their hardness, i.e. the pre-stress on the shaft is higher in the case of a hardened steel than in the case of an unhardened steel.
The adjusted level of elasticity also depends on the number of points of the periphery at which the thin-walled bushing comprises raceway convexities deviating form the circular shape. Advantageously, therefore, the raceway of the bushing comprises a raceway convexity in three peripheral sections offset at 120.degree. to each other. This results in a uniform pre-stress on the shaft from all sides, i.e. a self-movement is only possible by a neutralization of the elasticity of the thin-walled bushing existing in the regions of the raceway convexities.
According to a further feature of the invention, a flange of the second ring element comprises circumferentially uniformly spaced axial feed bores. The gap defined between the two ring elements is filled with damping fluid, i.e. with oil, through these feed bores.
A sealing ring is arranged on the end of the hollow ring remote from the feed bores between the flange of the second ring element and the rolling element crown ring.
This sealing ring assures a uniform oil pressure and a defined leakage because it prevents an uncontrolled outflow of the oil which is fed into the bearing fo
REFERENCES:
patent: 3829181 (1974-08-01), Gunther et al.
patent: 4337983 (1982-07-01), Hibner
patent: 4440456 (1984-04-01), Klusman
patent: 5352100 (1994-10-01), Bauknecht et al.
patent: 5419641 (1995-05-01), Fujinami et al.
patent: 5421657 (1995-06-01), Arff et al.
Metton Norbert
Steinberger Wolfgang
Footland Lenard A.
Ina Walzlager Schaeffler OHG
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