Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 64 views

    Spur - Gears - Metric - XLS: Tooth Normal Force

    Uploaded by

    Tigistu
    This spreadsheet calculates gear tooth strength parameters for spur gears using metric units. It enters user-supplied values for torque, material properties, gear dimensions, and calculates outputs like tooth stresses. Results from an FEA analysis of a sample gear tooth under a 1N normal load are also included, showing a maximum stress of 500,000 N/mm^2.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd

    Spur - Gears - Metric - XLS: Tooth Normal Force

    Uploaded by

    Tigistu
    64 views5 pages
    This spreadsheet calculates gear tooth strength parameters for spur gears using metric units. It enters user-supplied values for torque, material properties, gear dimensions, and calculates outputs like tooth stresses. Results from an FEA analysis of a sample gear tooth under a 1N normal load are also included, showing a maximum stress of 500,000 N/mm^2.

    Original Description:

    Original Title

    Spur_Gears_Metric

    Copyright

    © © All Rights Reserved

    Available Formats

    XLS, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This spreadsheet calculates gear tooth strength parameters for spur gears using metric units. It enters user-supplied values for torque, material properties, gear dimensions, and calculates outputs like tooth stresses. Results from an FEA analysis of a sample gear tooth under a 1N normal load are also included, showing a maximum stress of 500,000 N/mm^2.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    64 views5 pages

    Spur - Gears - Metric - XLS: Tooth Normal Force

    Uploaded by

    Tigistu
    This spreadsheet calculates gear tooth strength parameters for spur gears using metric units. It enters user-supplied values for torque, material properties, gear dimensions, and calculates outputs like tooth stresses. Results from an FEA analysis of a sample gear tooth under a 1N normal load are also included, showing a maximum stress of 500,000 N/mm^2.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    of 5

    Spur_Gears_Metric.

    xls
    Spreadsheet to estimate gear tooth strength
    Production gears must be designed using the Lewis Form Factor or FEA
    By Alex Slocum 1/18/01, last modified 9/28/2007 by Alex Slocum
    Enters numbers in BOLD, Results in RED
    Inputs
    Desired torque transmission, T (N-mm, in-lb) 12 0.1
    Maximum conservative achievable torque transmission
    (C35 stress ratio = 1) (N-mm, in-lb) 654 5.8
    Pressure angle, f (deg, rad) 20 0.3491
    Module, M 1
    Pitch, P 25.4
    Number of teeth on pinion, Np 24
    Number of teeth on gear, Ng 96 T
    Center distance tolerance, Ctol (mm) 0.01 no
    Face width, w (mm) 5 f
    Pinion yeild stress, sigp (N/mm^2, psi) 41 5944
    Gear yield stress, sigg (N/mm^2, psi) 41 5944
    Stress concentration factor at tooth root, scf 1.25
    Outputs
    Gear ratio, mg 4
    Pinion pitch diameter, Dp (mm) 24.00
    Gear pich diameter, Dg (mm) 96.00
    Center distance, C (mm) 60.01
    Tooth thickness at base tt (mm) 1.73 Dpitc
    Addendum, a (mm) 1.00
    Dedendum, b (mm) 1.25
    Clearance, cl (mm) 0.25
    Pinion tooth force (normal to radius), Fp (N) 1.00
    Gear tooth separation force (parallel to radius) Fs (N) 0.36
    Tooth section parameters
    Chordal area, Ac (mm^2) 8.6394
    First Moment, Q (mm^3) 3.73E+00
    2nd moment of area ("moment of inertia") I (mm^4) 2.15E+00
    Pinion tooth stresses (stress ratio must be less than 1) s ratio
    Transverse shear stress of the tooth (F/A) (N/mm^2) 0.14 0.01
    Bending induced shear stress (FQ/wI) (N/mm^2) 0.43 0.02
    Bending stress (F*b*c/I) (psi) 0.50 0.01

    From FEA of one tooth from MOD 1 gear


    load normal to the tooth (N) 1
    load normal to pitch radius (N) 0.94
    max stress from FEA (N/m^2, N/mm^2) 500000 0.5
    maximum tangential load (N) 78
    maximum torque (N-mm) 934
    Safe Von Mises stress (psi) Maximum Von Mises stress (MPa)
    Plastic Unfilled Glass-filled Plastic Unfilled Glass-filled
    ABS 3000 6000 ABS 21 41
    Acetal 5000 7000 Acetal 35 48

    Nylon 6000 12000 Nylon 41 83


    Polycarbonate 6000 9000 Polycarbonate 41 62
    Polyester 3500 8000 Polyester 24 55
    Polyurethane 2500 Polyurethane 17

    Tooth
    normal
    force Pressure angle f

    Tangential
    force

    Dpitch/2
    Modulus of elasticity
    psi Gpa
    2.96E+07 204
    1.00E+07 69

    1.50E+06 10
    400000 2.8
    500000 3.4
    300000 2.1

    You might also like