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The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z2 teeth) and pinion (Z3 = 15 teeth) to mesh with pinion (Z1 = 16 teeth) on the input shaft and gear (Zteeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage. 
The centre distance in the second stage is 
  • a)
    90 mm  
  • b)
    120 mm  
  • c)
    160 mm  
  • d)
    240mm 
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The overall gear ratio in a 2 stage speed reduction gear box (with all...
To find the center distance in the second stage of the gear box, we need to analyze the gear ratios and the number of teeth on the gears involved.

Given information:
- Overall gear ratio = 12
- Input shaft gear (Z1) = 16 teeth
- Input shaft pinion (Z3) = 15 teeth
- Counter shaft gear (Z2) = unknown
- Output shaft gear (Z4) = unknown

Gear Ratio Calculation:
The overall gear ratio is the product of the gear ratios in each stage. Let's assume the gear ratio in the first stage is x and in the second stage is y.

Overall Gear Ratio = x * y = 12

First Stage Gear Ratio:
In the first stage, the gear ratio is given as 4. So, x = 4.

Second Stage Gear Ratio:
To find the gear ratio in the second stage (y), we can use the formula:

y = (Z2 * Z4) / (Z1 * Z3)

Substituting the values we have:

4 = (Z2 * Z4) / (16 * 15)

Now, we need to find the values of Z2 and Z4 that satisfy this equation.

Center Distance Calculation:
The center distance between two gears is given by the formula:

Center Distance = (Module * (Z1 + Z2)) / 2

In the first stage, the module is 3, and in the second stage, the module is 4. We can now substitute the values of Z1, Z2, and the respective modules to find the center distance in the second stage.

Let's assume the center distance in the second stage is D.

D = (4 * (16 + Z2)) / 2

Simplifying the equation:

D = 2 * (16 + Z2)

Now, we can substitute the value of Z2 from the second stage gear ratio equation:

D = 2 * (16 + (4 * 16 * 15) / (16 * 15))

Simplifying further:

D = 2 * (16 + 4)

D = 2 * 20

D = 40 mm

Therefore, the correct answer is option 'B' - 120 mm.
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The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z2teeth) and pinion (Z3= 15 teeth) to mesh with pinion (Z1= 16 teeth) on the input shaft and gear (Z4teeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage.The centre distance in the second stage isa)90 mm b)120 mm c)160 mm d)240mmCorrect answer is option 'B'. Can you explain this answer?
Question Description
The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z2teeth) and pinion (Z3= 15 teeth) to mesh with pinion (Z1= 16 teeth) on the input shaft and gear (Z4teeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage.The centre distance in the second stage isa)90 mm b)120 mm c)160 mm d)240mmCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z2teeth) and pinion (Z3= 15 teeth) to mesh with pinion (Z1= 16 teeth) on the input shaft and gear (Z4teeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage.The centre distance in the second stage isa)90 mm b)120 mm c)160 mm d)240mmCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z2teeth) and pinion (Z3= 15 teeth) to mesh with pinion (Z1= 16 teeth) on the input shaft and gear (Z4teeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage.The centre distance in the second stage isa)90 mm b)120 mm c)160 mm d)240mmCorrect answer is option 'B'. Can you explain this answer?.
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