Bearings – Rotary bearing – Plain bearing
Patent
1997-04-10
1998-02-17
Hannon, Thomas R.
Bearings
Rotary bearing
Plain bearing
384138, 403370, F16C 3374, F16B 702
Patent
active
057185182
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to an axis joint for rotatable journalling of first and second construction elements in relation to each other, said first construction element comprising two parallel connecting pieces, spaced apart from each other and having circular openings located opposite each other, said axis joint comprising a bearing bushing rigidly connected to the second construction element and located between said connecting pieces concentrically with their openings, and a cylindrical bearing shaft extending concentrically through the bearing bushing and with its end portions through said openings, each end portion having an outwardly diverging recess to form an inner conical surface having predetermined conicity and a peripheral clamping portion defined by said conical surface, the cylindrical outer surface of the bearing shaft and end surface of the bearing shaft, the axis joint also comprising an engagement member in the form of a conical washer for each clamping portion and provided with a central opening, said washer having a conical outer surface for cooperation with the inner conical surface of the clamping portion and arranged to be received in the recess of the end portion, and a screw member which is passed through the central opening of the washers and an opening through the bearing shaft for axial displacement of the washers into said recesses. The invention also relates to a slide bearing means for axis joints for assembly between a bearing shaft and bearing bushing, comprising a cylindrical sleeve and sealing members to seal the cylindrical sliding surfaces of the sleeve and the bearing shaft.
Difficulties are encountered in the workshop industry in obtaining simple, reliable and play-free locking of axis joints in which the axis to be locked supports a machine part that is loaded with great pressure and simultaneously turned in relation to the axis. Another difficulty encountered with such axis joints is to protect the bearing surfaces from penetration of dirt, which causes abnormal wear of the bearing parts. Examples of such axis joints with locking and bearing problems are the journalling of the grab shanks in a timber grab, the journalling of the hydraulic cylinder against these grab shanks and the journalling of the parallel stays in both grab shanks. Conventional slide bearing arrangements have a sleeve and separate sealing rings received in special seats in the sleeve and the bushing in which the sleeve is mounted. As already mentioned, such arrangements do not provide sufficient sealing against dirt and lubricants. Wear may therefore occur on the sliding surfaces and lubrication must be performed at short intervals. They are also expensive to manufacture and time-consuming to assemble.
The object of the present invention is to provide an axis joint of such design as to ensure reliable, play-free locking and which has a slide bearing means that substantially reduces the above-mentioned problems associated with conventional slide bearing arrangements.
The axis joint according to the invention is characterized in that under influence of said screw members the clamping portions are arranged to abut directly against said connecting pieces so that a butt connection is obtained between the bearing shaft and the connecting pieces; that the bearing shaft is in the form of a sleeve with a cylindrical through-opening having a diameter equivalent to the smallest diameter of said recesses; that the bearing bushing contains a slide bearing consisting of a cylindrical sleeve provided at each end with internal, resilient, sealing lips in one piece with the sleeve: that an annular space is arranged radially outside each end portion to permit radial resilient expansion of the sealing lips upon insertion of the bearing shaft into the sleeve and resilient, sealing abutment against the bearing shaft during operation; and that in inoperative state the sealing lips have an inner diameter slightly less than the diameter of the bearing shaft so that said resil
REFERENCES:
patent: 3133769 (1964-05-01), Drake
patent: 3432214 (1969-03-01), Cashman et al.
patent: 5209594 (1993-05-01), Svenson et al.
Hannon Thomas R.
Hultdin System AB
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