Bearings – Linear bearing – Lubricating
Patent
1994-06-09
1995-03-21
Footland, Lenard A.
Bearings
Linear bearing
Lubricating
384 15, 384 45, F16C 2906
Patent
active
053990234
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a wiper unit for a bearing component, preferably a linear rolling bearing component, mounted on a raceway of a guide rail and comprising at each front end, a wiper retained by a carrier plate, the wiper being provided with lubricant canals for supplying lubricant to the bearing component:, and an end region of the wiper resting-on the raceway to retain lubricant in the bearing component.
From DE-PS 21 30 420, a wiper unit for a bearing component is known which permits a constantly dosed lubrication of a rolling bearing by simple and inexpensive means. This unit comprises a wiper of polymeric material having a wiping edge intended to clean the raceway during the reciprocating motion of a bearing component in the form of a recirculating roller shoe to keep impurities away from the rolling bearing and simultaneously prevent the escape of lubricant therefrom. Lubricant is transferred into the interior of the bearing component from the outside by means of an element made of an absorbent material which surrounds the wiper edge resting on the raceway. With this construction, it is possible that undesired emulsions which may be present on the raceway are transported together with the lubricant into the bearing.
The object of the invention is to provide a wiper unit permitting the supply of fresh lubricant, without leakage losses, directly to the bearing component while distributing the lubricant uniformly and assuring that, as far as possible, the entire lubricant remains in the bearing component during the reciprocating motion thereof so that the amount of lubricant required for re-lubrication is drastically reduced. In this way, users of equipment having such wiper units should be able to better meet enviromental requirements imposed by law. It is further intended to prevent lubricant; losses by leakage occurring between the wiper and the carrier plate due to unevennesses on the wiper contact surface.
According to a first proposition of the invention, this object is achieved by the fact that the lubricant canals are configured as grooves starting from an end Face of the wiper, there being arranged between the carrier plate and the wiper an elastic sealing layer provided with a tear-resistant foil which seals the lubricant canals. This elastic sealing layer levels out the unevennesses of the wiper end face and the foil prevents a too strong penetration of the sealing layer into the lubricant canals. The sealing layer can be made, for example, of a cellular material with a glued-on tear-resistant foil.
The wiper can be provided with connecting canals and transfer openings by which the lubricant canals arranged on the outer end face of the wiper can be connected with the inner end face thereof facing the bearing component. It is possible at the same time to insert a body of permeable cellular material into the transfer opening or the lubricant canal to extend through the entire free cross-section (clear width) thereof. In such a body made of open-cell cellular material which is inserted with slight pre-tension, the capillary effect in the lubricant-filled cells of the cellular material prevents the passage of small air bubbles and thus also a sinking of the liquid lubricant. In this way, a flowing-back of lubricant from parts of the lubricant canal situated at a higher level is prevented so that these parts of the canal do not need to be refilled after every new lubricating pulse. If the cellular material is removed from the transfer openings or the lubricant canals, as the case may be, the wiper can also be used for grease lubrication. Thus it is suitable not only for oil lubrication.
The transfer opening can be closed by an inserted valve of a material with rubber-like elasticity and having a widenable opening slit. It is also possible to close the transfer opening in one of the two directions of flow by means of an inserted non-return valve. Such insertable valve elements enable the wiper to be used both for oil and grease lubrication and they assure at the same time that air ingress into
REFERENCES:
patent: 5139347 (1992-08-01), Hattori
patent: 5267796 (1993-12-01), Nonaka et al.
patent: 5340219 (1994-08-01), Agari
Koschmieder Hartmut
Kotzsch Steffen
Winkelmann Ludwig
Footland Lenard A.
INA Walzlager Schaeffler KG
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