Bearings – Rotary bearing – Hydraulic or pneumatic bearing support
Patent
1992-01-23
1993-06-15
Hannon, Thomas R.
Bearings
Rotary bearing
Hydraulic or pneumatic bearing support
384107, 384121, F16C 3206
Patent
active
052194477
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an axial bearing system intended for a radially mounted shaft with two hydrostatic axial bearings capable of axial movement relative to a surrounding bearing housing, each comprising a flange with a pressure surface attache to the shaft, which pressure surface constitutes an essentially right angle with the shaft, an annular chamber bearing having a surface facing towards the pressure surface and in it an annular groove or a number of pockets, whereby the aforementioned surface with the pressure surface forms inner and outer sealing gaps to either side of the annular groove or the pockets and, together with the pressure surface, forms one or more chamber into which hydraulic fluid is introduced under pressure from a hydraulic fluid reservoir, which annular chamber bearing together with the bearing housing forms a hydraulically pressurized pressure chamber which forces the annular chamber bearing against the pressure surface, whereby the two annular chamber bearings are forced in mutually opposing directions, and devices, for example a servo valve, so arranged in conjunction with a sensor for monitoring the position of the shaft relative to the bearing housing as to regulate the quantity of hydraulic fluid supplied to each pressure chamber and the hydraulic pressure acting on each bearing, so as to permit the absorption of the variation in magnitude and direction of the load on the shaft, whilst retaining the possibility of the axial displacement of the same.
The need exists in many technical areas for a bearing system capable of axial adjustment which has the capacity to absorb large and varying axial forces. An example of such an area can be found in the pulp and paper industry, in which various areas of application make use of a type of axial mill in which axial forces of as much as 100 tonnes can arise, at the same time as which stringent requirements are imposed on accurate axial positional adjustment in order to achieve a precise grinding gap.
An axial bearing system of this kind is previously disclosed in PCT publication WO 88/03611, the introduction to which also contains a more detailed analysis of the requirements imposed as a general rule in respect of hydrostatic bearing system, and of other previously disclosed hydrostatic axial bearing systems.
The axial bearing system in accordance with the aforementioned PCT publication comprises a hydrostatic axial bearing on either side of a flange-like pressure-plate, which is rigidly attached to the shaft or is integral with it. In spite of the fact that the function of this previously disclosed axial bearing system is entirely satisfactory with regard to solving the tasks demanded of it, it has nevertheless emerged as being desirable to reduce the complexity of the bearing system.
The object of the present invention is to make available an axial bearing system of the kind referred to by way of introduction, which is of more simple construction and can thus be manufactured at a lower cost than previously disclosed bearing systems. This is achieved in accordance with the characterizing features of the invention in that at least one of the flanges is capable of being disassembled from the shaft, and in that the pressure surfaces face towards one another, that is to say the forces arising from the hydrostatic bearings and acting on the shaft are directed away from one another.
Also associated with the simplified structure is the fact that assembly and disassembly, for example for servicing, can be performed more rapidly and thus with sensor downtimes and less lost production than before.
The invention permits the direct transmission of power between the bearing housing and the axial bearing, that is to say it permits a smaller number of components and better concentricity than were previously achievable. Also achieved through the invention is a reduction in the length of the power flux, i.e. reduced elongation and compression of the constituent parts of the bearing, which is of considerable significance in the case of a high
REFERENCES:
patent: 3223463 (1965-12-01), Porath
patent: 3391965 (1968-07-01), Lindeboom
patent: 4430011 (1984-02-01), Kun
patent: 4794289 (1988-12-01), Barnaby
patent: 4892417 (1990-01-01), Spargo et al.
patent: 4915510 (1990-04-01), Arvidsson
Hannon Thomas R.
Kvaerner Hymac Inc.
LandOfFree
Axial bearing system intended for a radially mounted shaft does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Axial bearing system intended for a radially mounted shaft, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Axial bearing system intended for a radially mounted shaft will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1040037