UA53751C2 - Support bearing unit - Google Patents

Abstract

A support bearing unit relates to the area of machine-building. To increase the carrying and damping ability of the unit, having the a housing with channels for feeding oil and with a discharge cavity, shaft, self-installing pads, those go round the shaft, with provided in the central part of the working surface of those radial opening and in the inlet and outlet edges – distribution channels, one of which, in the inlet edge, is connected through the channels in the body of the self-installing pad to the channels of feeding oil, and the other, in the outlet edge, is through, and is installed in parallel to the long axis of the bearing unit; fixing screws, oil-removing blades; the lower self-installing pad is made with larger circular length with respect to the two other self-installing pads.

Description

groove 10, in the input edge 8, is connected through channels 2 in the body of the self-aligning pad C with the lubrication supply channels, and the other distribution groove 10, in the output edge 9, is made through and located parallel to the longitudinal axis of the bearing assembly. The supporting bearing assembly is equipped with oil-removal scrapers 11 made of wear-resistant material. An insert in the form of a locking scraper 12 is installed in the lower block C. The bearing unit also has fixing screws 13.

The support bearing assembly works as follows:

When the shaft 4 rotates, the lubricant flows through the lubricant supply channels and channels 2 in the body of the self-aligning pad Z to its working surfaces 5 through the distribution groove 10 in the input 8 edge. During the operation of such a bearing unit, each self-aligning pad Z rests on a self-generated hydrostatic film of lubricant. This lubricant film is formed as a result of the selection of a small part (of the order of 1095) of the consumption of the hydrodynamic lubricant film on the working surface 5 of the self-aligning pad Z in order to create hydrostatic pressure in the central pocket 6 made on the outer surface of each self-aligning pad 3. In turn, the hydrodynamic flow of lubricant fed by a directional oil supply from the turbo engine oil supply system through a channel in the bearing housing and distribution grooves 10 provided on the leading and trailing edges of each liner. The supply of oil from the distribution groove 10 along the recess against the direction of rotation of the shaft 4 allows to increase the area covered by cold oil, and the execution of a bevel on the opposite side of the distribution groove 10 increases the suppression of the flow of lubricant in the direction opposite to the direction of rotation of the shaft 4, and thereby helps to prevent hot oil from entering of oil on the working surface 5 of the next self-aligning pad 3, installed along the rotation of the shaft 4.

The absence of any mechanical supports in the bearing unit allows to simplify the design and eliminates the problems associated with wear of the supports, and the insulating and damping effect of the hydrostatic film on the supporting surface of the self-aligning pad contributes to the process of damping the vibrations of sound vibrations. Installation of oil-removal scrapers in the space between the pads allows you to remove the heated oil layer from the surface of the rotating shaft. Constant pressing of the oil-removal scraper against the surface of the shaft is ensured by the increased pressure of the lubricant in the chamber. The latter ensures the movement of the oil scraper to the shaft as it wears during operation. The same process of movement of the oil scraper is facilitated by the elastic forces of the material from which it is made, aimed at self-compensating the oil scraper against the shaft. The most efficient pocket works, the area of which is chosen within 14 - 2095 of the area of the pad back. The area was selected based on the optimal ratio of pressure required to lift the liner and the possibility of excessive side leaks from the hydrostatic film. A pocket that is too small requires a higher pressure than is available to lift the liner; too large a pocket causes excessive lateral leakage from the hydrostatic film, resulting in insufficient pressure to lift the pad. The diameter of the hole for pressure selection is chosen in such a way as to ensure a sufficiently large flow of oil into the pocket, as well as to minimize the possibility of channel clogging.

For thermal relief of the most loaded part of the pad, through-holes are made through the radial hole in the body of the pad, to which cold lubricant is supplied from the lubricant supply channels through the longitudinal channels in the housing and the annular groove on its end surface. The removal of the grease heated in the through channels is carried out with the help of an annular groove made on the opposite end surface of the housing from the side of the drain cavity. The redistribution of heat flows in the body of the pad is facilitated by the increase in the cross-sections of the through holes to the output edge of the pad, that is, to the most loaded part of the self-installing pad.

Thus, this design of the support bearing unit, in comparison with the known design of the support bearing unit, allows to significantly increase its load-bearing and damping capacity, as well as to increase the compactness and reduce the metal consumption of the unit.

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