Bearings – Rotary bearing – Plain bearing
Patent
1996-08-08
1999-03-23
Marmor, Charles A.
Bearings
Rotary bearing
Plain bearing
384275, 384296, 384461, 384901, F16C 2304, F16C 1700, F16C 3302, F16C 1900
Patent
active
058850066
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to bearings and bearing assemblies.
Conventional roller bearings consist of an inner race member, an outer race member and roller balls held between inner and outer races by a cage or flanges. Various types of plain bearings are also known in which rolling elements are replaced by a plastic bush. Some plain bearings of this type are able to operate without a lubricant however plain bearings generally suffer from the limitation that the bearing members became fused at high speed and/or under high loads.
Despite the improvements in plain bearings there is need for such a bearing which has a longer service life and/or is able to operate under more severe conditions such as high loads or at high speed for prolonged periods.
According to the present invention there is provided a bearing including an inner bearing having an annular peripheral bearing surface, outer bearing having an annular inner bearing surface and at least one set of intermediate bearing including a bearing ring having an annular inner bearing surface and an annular outer bearing surface and bearing bush means rotatably mounted about the inner bearing and rotatable with respect to the bearing ring and outer bearing the bush providing a bearing surface adjacent the inner bearing surface of the bearing ring and providing a bearing surface adjacent the outer bearing surface of the bearing ring.
The intermediate bearing of the bearing of the invention includes at least one bearing ring and bush. The bush may be in the form of a single bush member comprising two bush rings one inside and one outside of the bearing ring and connected by a web extending adjacent the end of the bearing ring. It is particularly preferred, however, that the bearing bush include an inner bush member rotatably mounted about the inner bearing and rotatable with respect to the bearing ring and having a peripheral bearing surface adjacent the inner bearing surface of a bearing ring and an outer bearing bush rotatably mounted about the bearing ring and having an inner bearing surface adjacent the outer bearing surface of the bearing ring.
The bearing ring may be integrally formed with the inner or outer bearing means however it is preferred that it be rotatable with respect to each of the inner and outer bearing.
In a preferred form of the bearing of the invention one of the inner and outer bearing includes an annular locating flange and a radial bearing surface disposed on each side of the locating flange and the other of said inner and outer bearing includes a pair of collars one collar extending on each side of the flange and the bearing includes two sets of intermediate bearing disposed between facing sides of the collars and locating flange one set on each side of the flange.
Preferably one of the collars, referred to as the thrust collar, is removable from the bearing including the pair of collars such that the other bearing components may be removed and reassembled as is required. It is preferred the thrust collar is detachable from the race provided with a collar at one end of the race a bearing surface and a portion for receiving the thrust collar at the other end of the race. The portion for receiving the thrust collar may be recessed; the recessed portion being on the inner surface when the outer bearing includes said collars and on the outer surface when the inner bearing includes the collars. The thrust collar receiving portion may also be provided with a radial groove to allow the end of the thrust collar receiving portion to be deformed to retain the collar. Alternatively, the thrust collar and collar receiving portion may comprise corresponding threaded portions.
The locating flange, which is preferably present on the inner surface of outer bearing, may be continuous or discontinuous and in the form of circumferentialiy spaced tabs or the like. The locating flange may be in a variety of sections or shapes such a square rectangular, curved, dovetailed, bevelled or the like. Preferably the flange has essentially parallel sides and i
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Kaness Matthew A.
Marmor Charles A.
Plastic Bearings & Housings Australasia PTY. Ltd.
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