CN103398100A - Magnetofluid oil film bearing - Google Patents

Abstract

The invention provides a magnetofluid oil film bearing, which belongs to the field of oil film bearings. The magnetofluid oil film bearing comprises a bearing pedestal, a bearing sleeve, an annular permanent magnet, a magnetic pole, an end cap and a magnetofluid in a wedge-form gap formed between a rotating shaft journal and the bearing sleeve. The magnetofluid oil film bearing is characterized in that superimposed blocks of tile-shaped permanent magnets are mounted tightly against the external surface of the bearing sleeve in an 120 DEG-arc region located at the center of the bottom of the external surface of the bearing sleeve and the tile-shaped permanent magnets are compressed by a stop piece with a concave arc upper surface and fastened by screws. The magnetofluid oil film bearing has the following advantage: the viscosity of the magnetofluid changes only in a bearing zone of the oil film bearing and is not affected in a non-bearing zone, so lubricating performance of the magnetofluid oil film bearing is substantially improved.

Description

The magnetic fluid filmatic bearing

Technical field

The invention belongs to the filmatic bearing technical field, be specifically related to a kind of magnetic fluid filmatic bearing.

Background technique

The advantages such as the lubricant oil of take is filmatic bearing that medium forms, and bearing capacity is large owing to having, strong shock resistance, applicable velocity range are wide, long service life, be widely used on the high, precision and frontier key equipment of the systems such as iron and steel, mine, metallurgy, electric power, space flight, aviation.But often at a high speed, turn round under the operating mode of heavy duty, the complexity such as the clockwise and anticlockwise commutation is frequent, impact shock is large, the dynamic pressure oil film of formation is unstable, easily causes the direct contact wear of axle and lining for filmatic bearing, affect bearing working life.For above-mentioned condition, there is the people to propose after deliberation magnetic fluid bearing, greatly improved the adaptive capacity of bearing, improve ride quality.

As application number is 201010222259.2, name is called the patent application of " intelligent sliding bearing and the controlling method thereof of automatically regulating the Lubricants viscosity ", produce externally-applied magnetic field to change magnetic fluid viscosity, the fine greasy property of improving sliding bearing of energy by be wound around hot-wire coil at the bearing sleeve outer surface; Application number is 02288353.3, and name is called the patent application of " Sliding Bearing Lubricated with Ferrofluid ", at the bearing sleeve outer surface, annular permanent magnet is installed and is produced externally-applied magnetic field; Application number is 200710029274.3, and name is called the patent application of " magnetic fluid bearing ", adopts two half contrary central column permanent magnets of opposing side magnetic pole to produce magnetic field.But above-mentioned patent deficiency is: the magnetic fluid viscosity on the whole internal surface of bearing sleeve all will change, it is favourable that this change improves greasy property to the loading ability of bearing district, to the non-bearing district, be disadvantageous, because the rising of non-bearing district magnetic fluid viscosity, increase interface friction force, thereby increase the rotating shaft running resistance, make heat increase simultaneously, the oil film temperature raises, and energy consumption increases, and this is all the negative effect that in prior art, the magnetic fluid filmatic bearing produces.

the patent of invention content

The object of the invention is to provide a kind of magnetic fluid filmatic bearing that produces externally-applied magnetic field at the filmatic bearing supporting region, can effectively overcome the shortcoming of magnetic fluid filmatic bearing in prior art.

The present invention is achieved in that as shown in Figure 1, 2, it comprises the magnetic fluid 6 in the wedge gap formed between bearing support 1, bearing sleeve 7, bearing (ball) cover 2, annular permanent magnet 3, magnetic pole 4, rotating shaft axle journal 5 and bearing sleeve 7, it is characterized in that being close to the bearing sleeve outer surface and being equipped with in bearing sleeve 7 middle 120 ° of circular arc intervals, outer surface bottom

watt shape permanent magnet 8 that piece is superimposed, the block 11 that is concaved circular cambered surface by upper surface compresses and uses screw fastening by a watt shape permanent magnet, wherein

for being less than 5 positive integer.

Advantage of the present invention and good effect are: because structure of the present invention is that a watt shape permanent magnet 8 is installed below supporting region, magnetic fluid is subject to magnetic fields can improve greasy property, the non-bearing district is not affected by magnetic fields, therefore overcome the negative effect existed in the prior art, also realize that uniform oil film distribution is stable simultaneously, improve bearing capacity, reduce friction factor, increase the service life.

The accompanying drawing explanation

Fig. 1 is the axial sectional view of the present invention

Fig. 2 is A-A sectional view in Fig. 1

In figure, the 1-bearing support; The 2-bearing (ball) cover; The 3-annular permanent magnet; The 4-magnetic pole; 5-rotating shaft axle journal; The 6-magnetic fluid; The 7-bearing sleeve; 8-watt of shape permanent magnet; 9,

-front and back oil inlet hole; 10,

-left and right oil outlet; The 11-block.

Embodiment

As shown in Figure 1, 2, adopt interference fit joint bearing sleeve 7 to be assemblied in the center hole of bearing support 1, in the bearing sleeve 7 middle 120 ° of circular arcs in outer surface bottom, be close to the bearing sleeve outer surface 5 superimposed watt shape permanent magnets 8 have been installed, the block 11 that is concaved circular cambered surface by upper surface compresses and uses bolton by a watt shape permanent magnet 8.Seal arrangement adopts annular permanent magnet 3 and magnetic pole 4 combination seals, and carries out axial restraint by bearing (ball) cover 2.Magnetic fluid 6 from the oil inlet hole 9 of bearing support 1 both sides, front and back,

enter in the wedge gap of bearing sleeve 7 and 5 formation of rotating shaft axle journal, when rotating shaft starts to rotate, because making the magnetic fluid viscosity in loading ability of bearing district, watt effect of shape permanent magnet 8 increases, can improve bearing capacity, reduce friction factor, improve the greasy property of filmatic bearing, improve the working life of bearing, effectively overcome the shortcoming that existing magnetic fluid filmatic bearing exists simultaneously.

Claims (1)

1. a magnetic fluid filmatic bearing, include bearing support (1), bearing sleeve (7), bearing (ball) cover (2), annular permanent magnet (3), magnetic pole (4), magnetic fluid (6) in the wedge gap formed between rotating shaft axle journal (5) and bearing sleeve (7), it is characterized in that in middle 120 ° of circular arc intervals, bearing sleeve (7) outer surface bottom, be close to the bearing sleeve outer surface the superimposed watt shape permanent magnet (8) of piece is installed, the block (11) that is concaved circular cambered surface by upper surface compresses and uses screw fastening by a watt shape permanent magnet, wherein

for being less than 5 positive integer.

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