The rolling bearing assembly is an operation which in the fitter assembly and the remedial work needs to do frequently, but the rolling bearing windage adjustment and pre-tight is a rolling bearing installation work important link.Accurate assurance windage adjustment and pre-tight craft concept, and utilizes this technique correctly in the installation work, is the bearing installation work quality guarantee.
The rolling bearing windage is refers in a ferrule fixed situation, another ferrule along radial direction or axial biggest active mass, therefore the windage divides into the radial direction windage and the axial windage two kinds.
When the rolling bearing assembles, its windage cannot too be big, also cannot too be small.The windage too is big, can create simultaneously withstands the load the rolling body quantity reduction, causes the single rolling body the load to increase, thus reduces the bearing the revolving precision, reduces the service life; The windage too is small, can cause the friction force to increase, the thermal increase which produces, the aggravating wears, similarly can cause the bearing the service life to reduce.Therefore, many bearings when assembly all must control and the adjustment windage strictly.
Pre-tight is the bearing when the assembly, for the bearing inner loop or an addendum circle axial force, eliminates the bearing windage, and causes the rolling body with in, the addendum circle to meet everywhere to produce at the beginning of distorts.Pre-tight can enhance the bearing under active status rigidity and the revolving precision.Is big regarding the withstanding load, the revolving precision request high bearing, is mostly in does not have the windage even to have under the few full conditions to work, in this kind of situation needs when the assembly carries on pre-tightly to the bearing.
The windage adjustment and pre-tight usually all is uses causes the bearing the inner loop to make the suitable axial relative displacement to the addendum circle the method to complete.
Not difficult to see from above technology concept, through to the rolling bearing windage adjustment, may enhance the bearing bearing capacity and the revolving precision, enhances the bearing the service life.But simultaneously can make the bearing friction to intensify, the calorific capacity increases, therefore, the adjustment windage or pre-tight at the same time must guarantee the good lubrication and the radiation.If the adjustment does not work as or the lubrication is not good, can in turn make the bearing attrition to intensify, life reduction.Therefore, carries on the rolling bearing windage correctly the adjustment and pre-tight, but also must pay attention to following question.
1st, the assembly specification is the selective assembly technique basic basis
May enhance the bearing effectively to the rolling bearing windage adjustment the revolving precision, enhances the bearing bearing capacity, lengthens the bearing the service life, meanwhile may reduce the vibration and the noise effectively, but by no means all rolling bearing when assembly all needs to carry on the windage the adjustment.But pre-tight no doubt may enhance the bearing rigidity and the helical precision, but simultaneously can make the friction to intensify, the fluid film is destroyed and produces the massive heat, therefore, must carry on by the pre-tight bearing the forced lubrication and cools, this technique is only restricted in to the bearing rigidity and in the revolving precision request extremely high situation uses, is one more special technique, the production actual also only is uses in the engine bed main axle assembly, other transmission system bearing assembly could not see nearly.
In rolling bearing assembly whether carries on the windage the adjustment and pre-tight, must assembly specification decision which proposed according to the technical document.To be specific, in the assembly specification, generally regarding high speed, the heavy load either the revolving precision request high bearing can have the adjustment bearing windage or the pre-tight request, otherwise, then can maintain the bearing windage, when assembly only does axial fixed then.Looked from the bearing type that, regarding the circular cone roller bearings, the angle contact bearing, the thrust bearing needs to carry on the adjustment to its windage; Regarding the general low speed, the underloading centripetal ball bearing, in the most situations does not need to carry on the adjustment to its windage, but only does axial fixed.
2nd, must issue the windage adjustment in the thermal equilibrium condition and the pre-tight request
The rolling bearing actual ideal work break, is a gap which stable adjusts after the bearing temperature rise.Therefore, the bearing windage adjustment should be divided two stages to carry on: First carries on the adjustment under the normal temperature according to the related operation standard and the specification to the bearing windage, to the gap appropriate and with the hand starting should feel revolving is nimble; Then, the adjusting mechanism suitably will return to the pine (to prevent when test run will cause bearing as a result of temperature increment to hug suddenly dies), will carry on the spatial maintenance test, will not surpass from the low speed to the high speed spatial operating time for 2 hours, in the highest speed spatial operating time many in 30 minutes, the bearing will be supposed to revolve nimbly, the noise small, the operating temperature does not surpass 50℃, finally the adjusting mechanism will reposition and locks then.
3rd, maintenance good lubrication
Not only the good lubrication may play reduces the friction the role, meanwhile the components has the cooling effect to on the bearing and the axis.The rolling bearing windage carries on after the adjustment, the friction can have the aggravating, produces the quantity of heat can enable the entire transmission system temperature to have the ascension.If cannot radiate promptly, these quantity of heats can cause the transmission components size to change, thus affects the rolling bearing gap change, has more quantity of heats, forms the vicious circle.Therefore, regarding the process windage adjustment rolling bearing, must have to maintain the good lubrication, reduces the friction, uses the unceasing circulatory flow the lubricating oil to carry off the massive heat more importantly, the control temperature ascension, realizes the transmission system thermal equilibrium.
Also must pay attention specially: In carries on before the spatial maintenance test, certainly must first inspect the lubrication system various spots feed whether normal, specially passes through the pre-tight bearing spot, needs the special attention its lubricating oil supplies to be sufficient, the working condition is good.
In brief, the rolling bearing according to the craft correct assembly, the reasonable use, carries out the rolling bearing windage adjustment earnestly and the pre-tight craft, is increases the bearing revolving precision and bearing capacity, reduces the transmission system vibration and the noise effective method, in the operation besides should achieve the rolling bearing assembles general specification, but also wants the key consideration bearing temperature rise and the lubrication to adjusts the work the influence, and also after carries on the spatial maintenance test must carry on the careful inspection and two adjustments, the patience careful work manner also is the assembly services the fitter essential good quality.
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