Bearing knowledge

Bearing cooperates to choose (1) cylindrical inside a few when cooperate Lv of take an examination of the bearing choice bearing of aperture main factors are as follows: The type of ① bear the bear that goes up at bearing according to action, rotate to ferrule circumstance, can be cent of bear of ferrule place susceptive fixed negative charge, circumgyrate bear and oscillating load 3 kinds. A.

Radial load of complex of fixed negative charge by ferrule raceway local district place bears, deliver the wind of corresponding and local district that cooperates the surface to axis or crust accordingly. This kind of bear calls fixed negative charge. The characteristic of fixed negative charge is complex radial load quantity and ferrule are relatively dormant. Bear the ferrule of fixed negative charge can be chosen commonly more loose cooperate. B.

Circumgyrate bear action along raceway at the vector of synthetic radial load on bearing ferrule circumferential direction rotates, ordinal bear by each place place of raceway, corresponding ground transfers each position to surface of axial crust aperture. This kind of bear calls circumgyrate negative charge, call a loop bear again. The characteristic of circumgyrate bear is to synthesize radial load vector and ferrule to rotate relatively. Bear aperture should choose the ferrule of circumgyrate bear and axis or crust to filter or be filled with too cooperate. If use clearance fit installation, can happen between each other skid phenomenon, can bring about interface thereby rub caustic, attrition is calorific, make temperature lifts quickly, bearing damages very quickly. The size that wants to add up to interference is decided according to locomotive condition, be in with bearing below bear action when the job, do not send cause ferrule inside axis or crust aperture cooperate apparently appear " creeping " the phenomenon is a principle. C.

Oscillating load action is at the vector of synthetic radial load on bearing ferrule inside the particular area of ferrule raceway swing relatively, for raceway particular area place bears, pass the particular area to axis or crust aperture surface, or action the bear on bearing is concussion bear, oscillatory bear, the person that its bear direction or numerical value often change, this kind of bear calls oscillating load, saying again is not directional bear. Bearing bears when oscillating load, be in especially bear when heavy burden carries on his shoulder or back, outer lane all should have been used inside be filled with cooperate. Inner ring swings when rotating, when normally inner ring uses circumgyrate bear cooperate. But, sometimes outer lane must be outside crust internal energy enough bearing to move about or its bear lighter when, can use what loosen a bit than circumgyrate bear to cooperate. The size bearing ferrule of ② bear falls in the radial heft action of bear, its radial can be compressed, easy cause cooperate flabby, piao its are to be below the circumstance of serious turn bear, easy generation skids phenomenon. Accordingly, to weighing bear circumstance, should compare small negative charge and normal load situation normally cooperate more some closer. Anyhow, bear is weighed more, its cooperate interference to should heal big. Bearing of ③ job temperature is when movement, the temperature that compares photograph adjacent spare parts normally because of the working temperature of ferrule is high, bearing inner ring may expand because of heat and become loose with bearing happening, outer lane may expand because of heat and affect the axial windage of bearing, so, when the choice cooperates, must notice to consider the temperature difference between ferrule and its heat to conduct direction. ④ rotates precision should is opposite of bearing rotate when the smooth sex demand of precision and movement is higher, reach oscillatory influence to eliminate the flexibility of bearing component to be out of shape, should measure avoid to use clearance fit. If,the structure of ⑤ axis and crust and material pledge axis and crust (box) aperture surface opens appearance irregular, will bring about bearing inside, of outer lane be out of shape out of order, and get power inhomogenous. Run from opposite directions type crust (box) body, with bearing outer lane cooperate to should not be had used be filled with cooperate, but also should not make outer lane outer housing (box) the roll inside aperture. When bearing installation is in crust of Bao Bi, light alloy (box) on aperture or hollow axis when, have enough bearing side to assure bearing, should use be in than installation large wall crust (box) body, cast-iron crust (box) what choose on body or sincere axis cooperate to matter some. ⑥ installation and disassemble in a lot of complex structure application, to go to the lavatory installation and disassemble, need to use clearance fit. According to bearing movement condition, if must have been used,be filled with when cooperating to install, can use depart bearing (inside, outer lane can install respectively have bearing of columnar roller bearing, needle bearing, tapered roller and thrust bearing) or the bearing of the aperture inside taper, can make assemble and unassemble handy. The axial displacement that ⑦ blame secures upright bearing this kind of displacement is to show the requirement installs a ferrule in the bearing that is not fixed end to there can be proper go from place to place in axial direction unoccupied place. Will bear normally the ferrule of fixed negative charge (it is outer lane commonly) install with clearance fit. If use inner ring or outer lane not to have the columnar roller bearing of archives edge (2000 model and 3200 model) or when needle bearing installs Yu Fei to secure end, inside, outer lane all has been used be filled with cooperate to install. (2) the bearing of the aperture inside the bearing round taper of the aperture inside conic form, its installation and disassemble more convenient, OK and direct installation go up at cone-shaped journal or exterior the intermediate sleeve that is cone-shaped cylinder (cover closely surely, withdrawal sleeve) on, next on the axis that sleeve installs Yu Yuanzhu form together among the edge. Bearing outer lane and crust (box) of aperture cooperate with cylindrical inside the regulation of aperture bearing is identical. Take the blame depart that be covered closely surely or retreats discharge lining bearing, can use at tolerancepublic errand larger bearing, but axial form tolerancepublic errand must be controlled strictly. 2.

Of bearing and axis and crust cooperate bearing and axis cooperate to use base aperture is made, of bearing and crust cooperate to use basic shaft to make. The cooperates to be used with the place in the machine building public errand of bearing and axis cooperates a system to differ, the internal diameter public errand of bearing is negative common difference more, accordingly, using identical below assorted condition, of bearing internal diameter and axis cooperate to compare normally cooperate relatively close together. Although public errand of bearing external diameter is negative common difference, but its public errand takes value and system of general noncombatant duty not identical also. CNC Milling