CALCULATION OF STRAIGHT SPUR GEARS FOR STRENGTH FORCES

FORCES IN THE ENGAGEMENT OF STRAIGHT SPUR GEARS - turning force - radial force

MODES OF TOOTH FAILURE 1. Failures due to bending stresses Breakage

MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces

CHOICE OF MATERIALS OF TOOTHED WHEELS Possible materials of toothed wheels:

DETERMINATION OF THE HARDNESS OF THE MATERIAL Steel ball – Brinell units BHN; Diamond

CLASSIFICATION OF STEEL GEARS 1. Gears with hardness (heat treatment is normalizing or martempering);

CALCULATION OF ALLOWABLE STRESSES maximum contact

CALCULATION OF ALLOWABLE STRESSES where is durability factor.

CALCULATION OF ALLOWABLE STRESSES For variable load where

CALCULATION OF ALLOWABLE STRESSES Allowable contact stress Allowable bending stress

CALCULATION OF ALLOWABLE STRESSES where m = 6 if

CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH

CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH Hertz formula is the specific design

CALCULATION OF STRAIGHT SPUR GEARS FOR BENDING STRENGTH

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7892-2.1.1.3_straight_spur_gears_for_strength.ppt

Количество слайдов: 23

>CALCULATION OF STRAIGHT SPUR GEARS FOR STRENGTH CALCULATION OF STRAIGHT SPUR GEARS FOR STRENGTH

>FORCES IN THE ENGAGEMENT OF STRAIGHT SPUR GEARS - turning force - radial force FORCES IN THE ENGAGEMENT OF STRAIGHT SPUR GEARS - turning force - radial force - normal force

>STRESSES IN SPUR GEAR TEETH STRESSES IN SPUR GEAR TEETH

>MODES OF TOOTH FAILURE 1. Failures due to bending stresses Breakage MODES OF TOOTH FAILURE 1. Failures due to bending stresses Breakage

>MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces A. Pitting

>MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces B. Abrasive wear C. Seizure

>MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces MODES OF TOOTH FAILURE 2. Failures due to contact stresses and frictional forces

>CHOICE OF MATERIALS OF TOOTHED WHEELS Possible materials of toothed wheels: CHOICE OF MATERIALS OF TOOTHED WHEELS Possible materials of toothed wheels: - Steel; - Cast Iron; - Plastics. Steel is the basic material. For gears medium carbon steels (0.40 C, 0.45 C or 0.50 C) and alloy steels (0.40 C-Cr, 0.40 C-Cr-Ni, 0.35 C-Cr-Mo, 0.45 C-Cr, etc.) are used.

>DETERMINATION OF THE HARDNESS OF THE MATERIAL Steel ball – Brinell units BHN; Diamond DETERMINATION OF THE HARDNESS OF THE MATERIAL Steel ball – Brinell units BHN; Diamond cone – Rockwell units C; Diamond pyramid – Vickers units HV.

>CLASSIFICATION OF STEEL GEARS 1. Gears with hardness (heat treatment is normalizing or martempering); CLASSIFICATION OF STEEL GEARS 1. Gears with hardness (heat treatment is normalizing or martempering); 2. Gears with hardness (heat treatment is full hardening, surface hardening, case hardening or nitriding).

>CALCULATION OF ALLOWABLE STRESSES maximum contact CALCULATION OF ALLOWABLE STRESSES maximum contact stress before failure; limit of contact endurance; NHi - design number of stress cycles; NH0 - base number of stress cycles.

>CALCULATION OF ALLOWABLE STRESSES where is durability factor. CALCULATION OF ALLOWABLE STRESSES where is durability factor.

>CALCULATION OF ALLOWABLE STRESSES For variable load where CALCULATION OF ALLOWABLE STRESSES For variable load where

>CALCULATION OF ALLOWABLE STRESSES Allowable contact stress Allowable bending stress CALCULATION OF ALLOWABLE STRESSES Allowable contact stress Allowable bending stress

>CALCULATION OF ALLOWABLE STRESSES where m = 6 if CALCULATION OF ALLOWABLE STRESSES where m = 6 if m = 9 if where k = 3 if k = 9 if

>CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH

>CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH Hertz formula is the specific design CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH Hertz formula is the specific design load; is the transformed modulus of elasticity; is the transformed radius of curvature.

>CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH CALCULATION OF STRAIGHT SPUR GEARS FOR CONTACT STRENGTH

>CALCULATION OF STRAIGHT SPUR GEARS FOR BENDING STRENGTH CALCULATION OF STRAIGHT SPUR GEARS FOR BENDING STRENGTH