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Views: 0 Author: Site Editor Publish Time: 2026-02-28 Origin: Site
Excessive internal stress: The huge transmitted torque pushes the tooth surface contact stress and tooth root bending stress close to the material's fatigue limit.
Significant elastic deformation: Gear shafts, housings and even gears themselves are not rigid bodies. Under heavy loads, bending and torsional elastic deformation occur, destroying the theoretically perfect gear meshing.
Thermal effects and manufacturing errors: Thermal expansion during operation, coupled with inevitable manufacturing and assembly errors, further exacerbates the deviation of the meshing state.
Impact and vibration: Sudden start-stop of equipment or load changes generate impact loads, which are prone to causing tooth surface damage and abnormal vibration.
Compensating for misalignment errors and deformations: Offset gear deflection caused by shaft bending, torsion and assembly errors to avoid load concentration at the tooth ends.
Uniformizing load distribution: Transforming edge contact into surface contact at the middle of the tooth width, significantly reducing the maximum contact stress and preventing premature pitting or spalling of the tooth surface.
Improving lubrication conditions: Avoiding lubricating oil film rupture caused by edge contact and forming a stable elastohydrodynamic lubrication film.
Reducing meshing impact and noise: Realizing smooth load transition to minimize vibration and noise during operation.
Compensating for meshing stiffness changes: Smoothing the periodic fluctuation of meshing stiffness caused by the variation of meshing tooth pairs during gear engagement and disengagement, thereby reducing vibration.
Offsetting thermal and elastic deformations: Compensating for the deformation of the gear body under heavy loads to avoid interference and edge contact at the tooth tip or root.
Enhancing transmission stability: Reducing engagement and disengagement impacts caused by manufacturing errors and deformations for smoother transmission.
Single pitch deviation and cumulative pitch deviation: Directly affect transmission stability and motion accuracy. Excessive deviations cause speed fluctuations, which may manifest as "crawling" at low speeds and trigger periodic impact loads under heavy loads.
Tooth profile deviation: Impacts tooth surface load distribution and stress levels. An ideal involute ensures line contact, while deviations lead to severe stress concentration.
Helix deviation: A key indicator that cooperates with axial modification. Even with theoretical crowning, excessive helix angle error will greatly reduce the modification effect and prevent ideal load distribution.
Radial runout: Reflects the coincidence degree between the gear's geometric center and rotation center. Excessive runout causes vibration and noise, and generates unbalanced centrifugal force.
Premature pitting and spalling: Edge contact causes local stress to far exceed the material's contact fatigue limit, leading to rapid pitting and further development into large-area spalling of the tooth surface.
Tooth breakage: Stress concentration at the tooth root or severe spalling leads to crack propagation, eventually resulting in catastrophic tooth breakage failure.
Scuffing and wear: Poor contact causes oil film rupture and direct metal-to-metal contact, generating high temperature that leads to fusion welding, tearing or abnormal wear of the tooth surface material.
Excessive vibration and noise: Worsening the working environment, and the resulting dynamic loads further accelerate the failure of adjacent components such as bearings and shafts.
Reduced transmission efficiency: Excessive friction and vibration consume additional energy, lowering the efficiency of the entire transmission system.
