DE7208188U - Maintenance-free roller bearing - Google Patents

Description

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Bensberg, February 29th, 1972 GtSH-We / Hs

INTERATOM

Internationale Atomreaktorbau GmbH 506 Bensberg

Maintenance-free rolling bearing

The present invention relates to a rolling bearing in which one or more rolling elements are guided in a rolling element cage and run on running tracks. The use of these well-known ball or roller bearings at high temperatures, aggressive media and / or radioactive radiation, for example in nuclear reactors, are hampered by a number of difficulties. On the one hand is a Maintenance or replacement of these bearings due to the limited accessibility is very difficult, and on the other hand, has has shown that a roller bearing is destroyed very quickly even with low loads and inadequate lubrication. The usual Oil or grease lubrication is often not applicable due to the lack of resistance of these lubricants.

A lubrication with graphite also encounters difficulties, since it has been shown that the graphite is only satisfactory Has lubricating properties when the atmosphere in which the bearing operates has a minimum level of moisture. - With regard to the compatibility of the protective gas atmosphere, for example nitrogen, with the coolant, for example liquid sodium, allowable minimum moisture content the former is well below that which enables graphite to have sufficient lubricity.

Attempts have already been made to use the raceways of the rolling bearing to be coated with a bonded varnish, which can consist, for example, of molybdenum disulfide Mo S "with an inorganic binder.

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The test results were not entirely satisfactory because the bonded coating was worn out after a relatively short time and prone to peeling.

The object of the present invention is a roller bearing that can be used even at high temperatures in aggressive media and when exposed to radiation can be operated maintenance-free over a long period of time.

To solve this problem, it is proposed that the roller cage contains a solid lubricant, which by the movement the rolling element in the cage is transferred to the former, and from these to the raceways *

In order to enable direct lubrication of the raceways, it is proposed according to a further feature of the invention, that the rolling element cage touches the raceways.

In a further embodiment of the invention it is proposed that the solid lubricant contained in the rolling element cage be known per se Is molybdenum disulfide and / or graphite. Both substances are sufficiently temperature and radiation resistant. The solid lubricant is expediently colloidal in the material of the rolling element cage dispersed.

In a further embodiment of the invention it is proposed that the material of the rolling element cage be bronze.

For roller bearings that are to be operated at temperatures of up to approximately 600 ^° C., it is proposed according to a further feature of the invention that the material of the roller body cage be an iron-nickel or iron-copper alloy.

In order to facilitate the release of solid lubricant from the rolling element cage onto the raceways, according to a further feature

times the invention suggested that the rolling element cage at least consists of two parts which are pressed against the raceways. In the case of an axial roller bearing, this is done in two ways in such a way that the rolling element cage is divided transversely to the axial direction into two halves, which are acted upon by spring force on the raceways are pressed.

In a further embodiment of an expedient axial roller bearing, it is proposed that individual roller bodies be placed in the roller body cage are replaced by springs that press the two halves of the rolling element cage against the raceways.

The drawing shows a roller bearing according to the invention, using the example of an AxiaX deep groove ball bearing. The

1 shows a longitudinal section and FIG. 2 shows a cross section through the bearing.

The figures show two rings (1) and (2) provided with raceways, on which in the case. Play eleven balls (3). The Rings (1) and (2) and the balls (3) can be the same as commercially available ball bearings of this type. The balls (3) are in a ball cage, which consists of two parts (5) and (6), and which are designed so that they contact the raceways of the rings (1) and (2). The ball cage can be made of a copper-tin-bronze consist of 6 percent by weight graphite with a grain size of 200 micrometers and 4 percent by weight molybdenum disulfide dispersed with a grain size of Λ0 micrometers are. The contact of the ball cage parts (5) or (6) with the raceways of the rings (1) or (2) is three in the example • Helical springs (7) are supported, which are arranged in the ball cage (5) and (6) instead of further balls (3).

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720818825.10.73

Claims (7)

'', «'<■ Il ι ι ι ι t t t ι ·. III ■ »> ι ι ι ι ι ι, protection claims 1. rolling bearing in which a plurality of rolling elements are geführx iv in a roller body cage, characterized by a solid lubricant included- . the rolling element cage (5 and 6). 2. Rolling bearing according to claim 1, characterized in that the rolling body cage (5 and 6) the raceways (1 and 2) touched. 3. Rolling bearing according to claim 1 ,. characterized, that the solid lubricant contained in the material of the rolling element cage (5 and 6) is known per se molybdenum disulfide and / or graphite is " H. Rolling bearing according to one or more of the preceding Claims, characterized in that the material of the rolling element cage (5 and 6) is bronze is. 5. Rolling bearing according to one or more of claims 1-3,. characterized in that the material of the rolling element cage is iron-nickel or iron-copper. ¹ government is. 720818825,10.73 "Til" ill "ι • t> V I » I til » 6 '. Rolling bearing according to one or more of the preceding claims,
characterized, that the rolling element cage consists of at least 2 parts (5 and 6) which are pressed against the raceways (1 and 2). 7. Axial roller bearing according to claim 6, characterized in that that in the rolling element cage (5 and 6) individual rolling elements (3) are replaced by springs (7).