RU2082027C1 - Combined support - Google Patents

Abstract

FIELD: mechanical engineering; high-speed rotary machines. SUBSTANCE: support is provided with flexible elliptical ring of different stiffness; this ring is mounted on shaft journal by means of pins for dampening under action of centrifugal forces. Sliding bearing is concentrically located in antifriction bearing and pins are provided with holes for feeding the lubricant to working zone of sliding bearing. EFFECT: increased service life and enhanced reliability of "rotor - support" system. 3 cl, 3 dwg

Description

 The invention relates to the field of mechanical engineering and can be used in rotary machines, which are subject to increased requirements for speed and the possibility of continuous operation in the "shutdown" mode.

Known combined bearing containing the housing and placed in it a hydrostatic bearing (GSP) and a rolling bearing. One of the two bearing surfaces of the SHG is the surface of one of the rings of the rolling bearing. In such a support, one SHG operates in the normal mode, and with a decrease in the supply pressure, the rolling bearing takes up the load [1]
This design of the support allows the separation of speeds (loads) between the GSP and the rolling bearing, however, in the considered case, the dynamic properties of the bearings in starting conditions deteriorate in the absence of an external pressure source, since there will be no centering of the shaft in the radial clearance of the sliding bearing and, in addition, it is assumed that the operation modes of the support depend on the supply pressure.

 The technical problem that the invention solves increases the life and reliability of the rotor-support systems by separating and duplicating the functions of a rolling bearing and a sliding bearing.

 The problem is achieved in that the combined support containing the housing and the rolling bearings and the sliding bearing housed therein is provided with an elastic elliptical, non-rigid ring mounted on the shaft journal with the possibility of deformation under the action of centrifugal forces. An elastic elliptic, non-rigid ring can be provided with pins to limit its deformations and install it on the shaft neck. The sliding bearing can be placed concentrically in the rolling bearing, and the pins can be made with holes for supplying lubricant to the working area of the sliding bearing.

 In FIG. 1 shows a combined support with a concentric arrangement relative to the neck of the shaft of the rolling bearing and the sliding bearing; in FIG. 2 combined support with a sequential arrangement relative to the axis of the shaft of the rolling bearing and sliding bearing; in FIG. 3 is a diagram of the interaction of an elastic elliptic non-rigid ring with an inner race of a rolling bearing when starting the machine.

 The combined support consists of a housing 1, in which rolling bearings 2 and a sleeve 3 of a plain bearing are placed. With a concentric arrangement of bearings (Fig. 1), this function is performed by the inner race of the rolling bearing. By means of pins 4, an elastic elliptic, non-rigid ring 5 is mounted on the neck of the shaft 6. During installation, the said elastic ring 5, as a result of deformation, enters the rolling bearing 2 and is pressed against its inner race.

 The support works as follows.

 When starting (stopping) the machine, the centering of the neck of the shaft 6 and the transfer of the load to the housing 1 is carried out through an elastic elliptic non-rigid ring 5 and a rolling bearing 2. At this time, there is no relative movement between them, and the friction moment in the bearing is overcome due to the adhesion forces arising from the mounting compression of the said elastic ring 5. With an increase in the shaft rotation speed, the elastic ring 5 deforms under the action of centrifugal forces in the directions of the largest mass arrangement (Fig. . 3). In this case, the inner race of the rolling bearing 2 loses adhesion with the elastic ring 5 and can rotate at a lower frequency. With a parallel arrangement relative to the axis of the shaft of the rolling bearing and the sliding bearing (Fig. 1), the inner race of the rolling bearing 2 and the outer surface of the elastic ring 5 become the bearing surfaces of the sliding bearing. With a sequential arrangement of the sliding bearing and the rolling bearing (Fig. 2), the latter in this case actually goes out of operation, and load transfer and centering of the shaft journal 6 are carried out by means of a lubricating layer of the sliding bearing.

 The supply of lubricant to the working area of the sliding bearing formed by the inner race of the rolling bearing 2 and the ring is through holes in the pins 4 (Fig. 1). To limit the deformation of the elastic ring 5 at high speeds, the protrusions on the pins 4 located in the more massive parts of the ring 5 are used (Fig. 3). The length of the pins is selected so that their end surfaces can serve together with the elastic ring 5 as part of the supporting surface, or form a bearing pocket.

 Thus, this support allows the separate functioning of rolling bearings and sliding bearings depending on the shaft speed, to improve the dynamic characteristics of the support unit in start-stop modes, to increase the service life and reliability of machines.

Claims (3)

 1. A combined support comprising a housing and a rolling bearing and a sliding bearing disposed therein, characterized in that it is provided with an elastic elliptical, non-rigid ring mounted on the shaft neck with the possibility of deformation under the action of centrifugal forces.  2. A support according to claim 1, characterized in that the elastic elliptical, unequal rigid ring is provided with pins to limit its deformation and install it on the shaft neck.  3. The support according to claim 2, characterized in that the sliding bearing is arranged concentrically in the rolling bearing, and the pins are made with holes for supplying lubricant to the working area of the sliding bearing.

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