Bearing of metallurgy gear case uses a technology

Select suitable bearing kind- - bearing of gear case of metallurgy of biserial roller bearing uses combination of biserial roller bearing to satisfy requirement of drive of motivation of heavy load, high-power commonly. Roller bearing with tapered roller bearing, columnar roller bearing and bearing of the roller that move a heart are given priority to. Metallurgy gear case is used why to plant type bearing should suffer the characteristic place with force operating mode and of all kinds respective bearing to decide by gear axis. Bearing of biserial tapered roller has good radial and axial compound load ability, bearing interior windage can be adjusted, additional benefit at enhancing transmission system tigidity, because bearing of this tapered roller is metallurgy gear case,devise the bearing type of first consideration. Tapered roller bearing also has insufficient place, for example: The price is higher and do not have self-regulated heart, fight prejudicial ability, because this metallurgy gear case also chooses other type bearing in great quantities, if move bearing of heart, columnar roller. Metallurgy gear case often is mixed design a purpose in order to achieve optimization with different type bearing. Compare with photograph of tapered roller bearing, cost of bearing of the roller that move a heart is inferior, below specific requirement getting power this bearing also can bear diameter axial is compound load. The advantage with the biggest bearing of the roller that move a heart is to have self-regulated heart capacity, can work normally below prejudicial condition. When bearing exterior dimension approximate, choose bearing of biserial cylinder roller to be able to acquire higher radial carrying capacity, but this type bearing cannot bear axial load. When with axial in radial normally compound load condition chooses columnar roller bearing, need is used add stop push bearing or other type bearing to bear axial is laden. 2.

When combination of bearing of biserial tapered roller uses bearing of biserial tapered roller to combine, bearing one aspect of the matter connects standing to secure upright " for " , namely end panel of the outer lane inside bearing all is supported not to leave gap closely, axial load action bears to axial fixed position since, bearing of other one aspect of the matter carries " for " float, with will absorb gear axis heat to expand reach accumulate tolerancepublic errand. "Float carries " bearing to bear only radial load, end panel of bearing outer lane and bearing upright lid and block a shoulder to answer obligate is enough clearance, produce axial displacement in order to touch axle of the tine after disappear be heated expands, detailed structure is shown 1 times like the graph. Deliver to rise twist be apart from, metallurgy gear case chooses the way of clench the teeth of helical gear in great quantities. Below burden condition, helical gear produces concussion vibration noise, movement not easily to reach larger carrying capacity smoothly, because this helical gear is in,burden drive condition leaves drive of excel straight gear. But the meeting when helical gear clench the teeth produces additional axial thrust and action secures upright " bearing to " . When axial when thrust is bigger, choose bearing of biserial tapered roller to secure upright " as " , perhaps add stop push bearing all is ideal to settle way. Have clench the teeth of individual helical gear only when gear axis, and when gear axis " secures upright " to choose bearing of the roller that move a heart, should notice bearing place bears the biggest axial and relationship of radial ratio getting power. Bearing of the roller that move a heart because the structural characteristic of oneself, suffer axial force to exceed oneself place to suffer radial load 1/3 or 1/4 when bearing place (decide according to specific bearing series) when, bearing can appear odd side roller gets power, sky of another side roller records a case. Do not suffer force to carry roller rotating to cannot guide in raceway in the process and locate, meeting occurrence roller is askew, skid, bump the circumstance such as cage, serious when the likelihood brings about cage to rupture bearing shifts to an earlier date invalidation. Bearing of biserial tapered roller uses pure scroll and rib of roller end panel to guide a design, install windage through controlling bearing, can use at bigger axial to suffer force and only kind roller to bear the weight of operating mode, the characteristic of two sort bearing and distinction can consult the graph is shown 2 times. "Secure upright " bearing to bear diameter axial is compound load, to partake bearing gets power and carry longevity service life, "Secure upright " to be put in radial to get power commonly lesser a side, "Float carries " to be put in radial to get power older one end. Be in sometimes choose bearing of the roller that move a heart to be the axial carrying capacity that increases bearing, also can secure " upright " to be put in radial to get power bigger a side, below this kind of circumstance, "Secure upright " to move carrying capacity of heart roller bearing to answer float of prep above " carries " bearing. Nextpage 　 　 3.

Drive of consideration operating condition and axial load awl bevel gear and helical gear are relatively similar, bigger axial load also can produce when gear clench the teeth, bearing type selecting also should join consideration operating condition and axial load size. Person handwriting positive drive can is opposite when consummate use but come back to apply to contrary bevel gear, axial thrust won't arise when clench the teeth of person handwriting gear, apply in rolling mill gear case wider. When choosing drive of clench the teeth of person handwriting gear, input and take-off need to install a " to secure upright " to come only gear of axial fixed position can. The others position all should be set for " float carries " , "Float carries " bearing to be able to use cylinder or bearing of the roller that move a heart, "Secure upright " to should choose the bearing of biserial tapered roller with axial stronger carrying capacity. Bearing optimizes type selecting to if the graph is shown 3 times,be designed, "Float carries " bearing to all use sheet to list columnar roller bearing. Additional, in application of gear case of rolling mill of high speed marvellous wire, the bearing of biserial tapered roller that high speed inputs an axis to often use special design will be competent to be quickened high rotate speed, often, decelerate, turning reach invert wait for slashing bearing to use a condition. 4.

Consider type selecting of enough carrying capacity bearing to select bearing kind besides correct ground, what choosing bearing to whether have sufficient carrying capacity also is the crucial factor that wants a consideration. Computational bearing suffers force to reach bearing theory life is the most commonly used the method that measures bearing carrying capacity. Metallurgy gear hakone occupies different application, general metropolis has life of bearing lowest theory to ask, have life of some of lowest of bearing of gear case demand for example not under 50 thousand hours, some application ask not under 30 thousand hours. It is normally when computational bearing life, to get keeping bearing life, general bearing rotates speed chooses rotate speed of condition of average operating mode to replace top rotate speed coming back to spend. Gear case drive is in power is constant below the condition, rotate speed is reduced can bring about torque to rise, and torque rises can bring about bearing to suffer force to rise. To the life computation of bearing, bearing life and rotate speed become 1: 1 inverse ratio concerns, but with suffer force to become 10 times concern, namely bearing suffers force to increase one times, bearing life can reduce 10 times. Inferior to a few burden and rotate speed applying, result of academic bearing life normally cannot function of real report bearing, normally rated equivalent and bearing suffer main consideration bearing whether is force ratio more than safety factor, more accurate method is to pass roller of bearing of analytic software computation stress of the biggest contact. 3, bearing public errand cooperates bearing of metallurgy gear case to be in load of heavy load, concussion, tall or low rotate speed normally harsh moving environment, choose bearing public errand correctly to cooperate not only benefit easily the installation of bearing, can ensure the bearing below condition of load of burden, concussion won't appear at the same time run a circumstance. Generally speaking, bearing rotates the component has been used be filled with cooperate, fall asleep component uses clearance fit. Bearing is filled with actually too cooperate limits to change according to bearing size not only, and should use below condition of application of burden, high rotate speed bigger than convention application condition be filled with too cooperate. When choosing bearing of imperial tapered roller, should notice imperial adjust with the difference that public errand of metric bearing oneself takes accordingly cooperate axis and bearing scope of tolerancepublic errand size. If the graph is shown 4 times, limits of public errand of diameter of the outer lane inside imperial bearing all adds tolerancepublic errand " for " , as contrary as metric bearing as it happens. Be like axis and bearing tolerancepublic errand limits still is chosen according to metric bearing, the outer lane inside imperial bearing all can appear transition fit circumstance, it is difficult to bring about bearing outer lane to install and inner ring runs easily circle, affect bearing service life. Specific noncombatant duty cooperates imperial bearing dimension should consult bearing supplier recommends measure. Compare with imperial bearing photograph, public errand of bearing of metric large size cooperates to choose relatively simple, rotate to inner ring of burden, bearing outer lane still uses a condition, the large size of millimeter of 320~500 of scope of internal diameter size moves heart or columnar roller bearing, the axis can use range of R6 public errand. Exceed the tone heart of 500 millimeter or columnar roller bearing to internal diameter dimension, the axis can use range of R7 public errand. Tone heart or columnar roller bearing tolerancepublic errand limits all can choose H7 or G7. 4, bearing is initiative bearing of heart of initiative windage and ball bearing, attune, columnar roller defines bearing of windage tapered roller different, it is to point to axial windage (BEP) , other bearing all is radial windage (RIC) , if pursue,5 are shown. The initiative windage of bearing decided to windage works after bearing installation and movement. The windage of bearing decided bearing job bears the weight of the size of the area, initiative windage chooses bearing too congress brings about bearing job to bear the weight of the area slants small, bear namely the roller amount of force is less, bring about bearing life to reduce. Windage of tapered roller bearing chooses to still may appear to roller wears away or bump cage greatly too, bring about cage to rupture circumstance happening. Initiative windage chooses bearing too small conference brings about bearing calorific and serious, appear bearing is held in the arms dead, the circumstance such as burn down. Bearing of metallurgy gear case is initiative windage should according to the axis be filled with too cooperate quantity and bearing top rotate speed coming back is spent computative reach. Be filled with too when inner ring of gear case bearing and axis when cooperating, external diameter of bearing inner ring can expand and eat off a part initiative windage, initiative windage has been decreased be filled with the installation windage that cooperates losing windage to be bearing namely (MEP) . Do not exceed the bearing of imperial biserial tapered roller of 400 millimeter to internal diameter dimension commonly, the windage limits after installation should not is more than 0.

5 millimeter. Exceed the large size bearing of 400 millimeter to internal diameter, the limits of the biggest windage after installation can magnify 0.

6 millimeter are controlled. Initiative windage chooses bearing of metallurgy gear case to take no account of environmental temperature commonly, and consider bearing inside and outside to encircle the temperature that need a value only, because environmental temperature can bring about axial heat to expand, but bearing environmental temperature influence also can bring about heat to expand. The windage after bearing is installed (the windage that MEP) decreases bearing inside and outside to encircle the temperature rise that need a value to eat off, get final bearing runs windage (OPE) . Bearing of big tapered roller of metallurgy gear case stems from safe windage consideration, run windage finally not to allow to appear commonly negative windage. Initiative windage chooses metric cylinder and bearing of the roller that move a heart method and tapered roller bearing are similar but simpler, be filled with too to inner ring of large size, bearing normally cooperate, condition of outer lane clearance fit, burden application, initiative windage can use bearing limits of standard C3 windage. 5, the installation dimension of bearing of bearing installation dimension basically includes axial shoulder and bearing dimension of the diameter that block a shoulder, axis and bearing the biggest radius pouring wine cup. To tapered roller bearing, installation dimension still includes measure of cage security clearance. Axial shoulder and bearing dimension of the diameter that block a shoulder should ask strictly to choose according to bearing, proper measure can ensure bearing end panel has enough interface to accumulate, bearing of influence of too big or too small metropolis uses this measure. Gear axis and bearing the biggest radius pouring wine cup should be less than the outer lane inside bearing oneself to pour horny radius, axis and bearing radius pouring wine cup crosses congress to bring about bearing to cannot be installed reach the designated position, cause inside and outside the circle is askew, affect bearing to be used normally thereby. Anyhow, when designing metallurgy gear case, should take the installation dimension of bearing seriously, should not increase at will or reduce set dimension. 6, the requirement with the moving more strict to matching used bearing to put forward environment with harsh gear case of last word metallurgy, use high-powered bearing, using bearing correctly is the premise condition that ensures gear case works reliably continuously. The article passes type selecting of pair of bearing of metallurgy gear case, public errand to cooperate, initiative windage and installation dimension point make simple introduction, can design personnel and equipment to defend personnel reference for metallurgy gear case. CNC Milling