Worm Drive failure modes and gear ( gear reducer ) Similarly , some tooth surface pitting , wear, glue and other forms of worm gear teeth broken . Which Yiyu tooth surface pitting together and worm gear tooth wear is the most common , in addition to gluing also occur. The failure occurs , mainly due to the engagement between the teeth of the relative sliding velocity is large, in particular for lubricating the cylinder angle worm gear 8 is too small , can not form a hydrodynamic oil film , resulting in low efficiency of eating together caused the temperature rises . In addition, because the worm insufficient stiffness or manufacture and installation error and other factors can lead to the emergence of these failure modes . Worm gear tooth wear due after more than broken tooth thickness thinning over children , and installation of large errors arising due to severe partial load . In short, the worm tooth structure and mechanical properties of materials used in worm gear than good , so both the worm gear is the weak link .
If a reasonable choice in the design of the drive type and parameters , select the appropriate combination of materials , together with a good lubrication and cooling measures , the choice of lubricant wear and scuffing to improve the processing and mounting accuracy , the above situation can be failure improved and extended service life .
Load factor
In the worm gear reducer in its load factor includes the following four factors : service factor KA. Dynamic load coefficient K, teeth and the tooth load distribution coefficient Ka load distribution coefficient K0.
Using factor KA: Consider gear external dynamic load impact factor - the original motivation, job machine running characteristics , coupling buffer performance caused by external factors such as dynamic load .
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| Worm Gear units |
Dynamic load coefficient K: Taking into account the gear meshing error and their speed of operation caused by internal additional dynamic load factor . The error is due to the section engaging mushroom error profile error , so that the driven gear wheel deformation generated during operation of the dynamic load caused by the change impact velocity . Factors: manufacturing precision , circumferential speed , etc., in order to reduce the impact of dynamic load of gear for different tolerance levels were maximum peripheral speed limit .
Worm gear teeth load distribution coefficient Ka: Taking into account due to manufacturing errors and tooth deformation under load causes such as load distribution between various pairs of teeth uneven coefficient . Ring -shaped main factor is the design and manufacture of coincidence degree difference , coincidence degree affect tooth engagement on the number and range .
Worm gear tooth load distribution factor K0: Consider the same pair of gears , the coefficient . Reason: axis bending, torsion deformation, resulting in gear and the gear inclined to one another twist .
Uneven distribution of the load along the contact line of the elastic displacement of the bearing , the drive unit manufacture and installation errors.
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