Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
The accessory drive unit of a large aircraft engine involves an identical pair of 20 degree full-depth spur gears. The gears have 60 teeth, and rotate together at 5000rpm. The diametral pitch is 12 and the face width 1.0 in. The gears are made of alloy steel, case hardended to 62RC (680Bhn). Although the case extends throughout the fillet, it is conservatively decided to use the core hardness of 500Bhn for calculating bending fatigue strength. The tooth profile are finished with a fine-grinding operation that gives degree of precision justifying the use of Curve A of figure 15.24 and the assumption that teeth share the load. The loading involves only very mild shock, justifying the use of K =1.1. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue. 5000 rpm Identical spur gears: N= 60 $ = 20° P= 12 b = 1.0 in. Alloy steel material, case hardness 680 Bhn, core hardness 500 Bhn. Tooth profiles finished and ground to requirement of curve A in Fig. 15.24. + Overload factor, K, = 1.1

The accessory drive unit of a large aircraft engine involves an identical pair of 20 degree full-depth spur gears. The gears have 60 teeth, and rotate together at 5000rpm. The diametral pitch is 12 and the face width 1.0 in. The gears are made of alloy steel, case hardended to 62RC (680Bhn). Although the case extends throughout the fillet, it is conservatively decided to use the core hardness of 500Bhn for calculating bending fatigue strength. The tooth profile are finished with a fine-grinding operation that gives degree of precision justifying the use of Curve A of figure 15.24 and the assumption that teeth share the load. The loading involves only very mild shock, justifying the use of K =1.1. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue. 5000 rpm Identical spur gears: N= 60 $ = 20° P= 12 b = 1.0 in. Alloy steel material, case hardness 680 Bhn, core hardness 500 Bhn. Tooth profiles finished and ground to requirement of curve A in Fig. 15.24. + Overload factor, K, = 1.1

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
See similar textbooks
icon
Related questions
Question

Help me with this question please! Thanks!

Guide: Step 1. Using Figure 15.24, 15. 23 (a) and Table 15.2, find velocity factor, geometry factor and mounting factor. Apply modified Lewis equation find the bending stress. Step 2. Using Figure 8.13 Table 15.3, find Cs and Kr. Apply tooth endurance strength equation, find tooth strength. Step 3. Equating tooth bending stress and tooth strength, find the allowable horsepower. Comment: Only bending fatigue failure is considered in this example. More accurate evaluation should consider both surface fatigue failure and bending fatigue failure.
Transcribed Image Text:Guide: Step 1. Using Figure 15.24, 15. 23 (a) and Table 15.2, find velocity factor, geometry factor and mounting factor. Apply modified Lewis equation find the bending stress. Step 2. Using Figure 8.13 Table 15.3, find Cs and Kr. Apply tooth endurance strength equation, find tooth strength. Step 3. Equating tooth bending stress and tooth strength, find the allowable horsepower. Comment: Only bending fatigue failure is considered in this example. More accurate evaluation should consider both surface fatigue failure and bending fatigue failure.
The accessory drive unit of a large aircraft engine involves an identical pair of 20 degree full-depth spur gears. The gears have 60 teeth, and rotate together at 5000rpm. The diametral pitch is 12 and the face width 1.0 in. The gears are made of alloy steel, case hardended to 62RC (680Bhn). Although the case extends throughout the fillet, it is conservatively decided to use the core hardness of 500Bhn for calculating bending fatigue strength. The tooth profile are finished with a fine-grinding operation that gives degree of precision justifying the use of Curve A of figure 15.24 and the assumption that teeth share the load. The loading involves only very mild shock, justifying the use of K. = 1.1. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue. 5000 грm Identical spur gears: N= 60 $ = 20° P= 12 b = 1.0 in. Alloy steel material, case hardness 680 Bhn, core hardness 500 Bhn. Tooth profiles finished and ground to requirement of curve A in Fig. 15.24. + + Overload factor, Ko = 1.1
Transcribed Image Text:The accessory drive unit of a large aircraft engine involves an identical pair of 20 degree full-depth spur gears. The gears have 60 teeth, and rotate together at 5000rpm. The diametral pitch is 12 and the face width 1.0 in. The gears are made of alloy steel, case hardended to 62RC (680Bhn). Although the case extends throughout the fillet, it is conservatively decided to use the core hardness of 500Bhn for calculating bending fatigue strength. The tooth profile are finished with a fine-grinding operation that gives degree of precision justifying the use of Curve A of figure 15.24 and the assumption that teeth share the load. The loading involves only very mild shock, justifying the use of K. = 1.1. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue. 5000 грm Identical spur gears: N= 60 $ = 20° P= 12 b = 1.0 in. Alloy steel material, case hardness 680 Bhn, core hardness 500 Bhn. Tooth profiles finished and ground to requirement of curve A in Fig. 15.24. + + Overload factor, Ko = 1.1
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Dimensional Analysis
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS