Bissoy.com
Doctors Medicines MCQs Q&A

The problem of interference in involute profile gears can be overcome by which one of the following means?

The problem of interference in involute profile gears can be overcome by which one of the following means? Correct Answer Using composite profile with cycloidal curve at the root of the tooth

If the involute portion of the touches the non-involute portion of the gear, there is involute to non-involute interaction between the mating gears and the law of gearing will not be satisfied, this situation is called interference in the gears.

The interference in involute profile teeth is eliminated by the following method:

  • By the use of composite profile at root of tooth of gear (pinion). This composite profile may be radial or cycloidal, but in the cycloidal profile the pressure angle changes from the maximum at the start of the engagement and becomes zero at the pitch point and again reaches the maximum value at the end of engagement.
  • By the use of stub teeth i.e. reducing the height of the gear teeth it reduces the addendum circle radius but it also reduces the contact ratio.
  • Undercutting the gears so that the portion of the tooth which will interfere with gear will be absent.
  • By increasing the pressure angle, but there is a limitation on the higher value of pressure angle (20-25°)
  • Increasing the number of tooth, it decrease the addendum circle radius and decreases the interference. 

Related Questions

Consider the following statements: 1. In spur gears, the contact occurs abruptly on a line parallel to the axis, and the disengagement too is abrupt. 2. In helical gears, both loading and unloading are gradual, and therefore, these happen more smoothly and less noisily 3. When two gears mesh, any arbitrary shape of the tooth can be chosen for the profile of the teeth of any one of the two gears, and the profile for the other shall be obtained by applying the law of gearing. Which of the above statements are correct?
Consider the following modifications regarding avoiding the interference between gears: 1. The centre distance between meshing gears be increased 2. Addendum of the gear be modified 3. Teeth should be undercut slightly at the root 4. Pressure angle should be increased 5. Circular pitch be increased Which of these are effective in avoiding interference?
A line of 12 cm length is perpendicular to profile plane and the least distance from this line to profile plane is 6 cm. This is at a distance of 4 cm from the vertical plane and 5 cm from the horizontal plane. What is distance from the point on line far away from the profile plane to profile plane?
If 'blue' means 'green', green' means 'yellow' 'yellow' means 'orange', 'orange' means 'black', 'black' means 'white', 'white' means 'red', 'red' means 'pink', 'pink' means 'brown', 'brown' means 'grey', than what is the color of human blood?
Which of the following statements are correct for mating gears with involute profiles? 1. The pressure angle, from the start of the engagement to the end of the engagement, remains constant. 2. The pressure angle is maximum at the beginning of the engagement, reduces to zero at pitch point, starts decreasing and again becomes maximum at the end of the engagement. 3. The face and flank of the teeth are generated by a single curve and the normal to this curve at any point is tangent to the base circle of the gear. 4. The centre distance for a pair of mating gears can be varied within limits without altering the velocity ratio. Select the correct answer using the code given below.
Which of the following statements are correct for mating gears with involute profiles? (i) The pressure angle, from the start of the engagement to the end of the engagement, remains constant. (ii) The pressure angle is maximum at the beginning of the engagement, reduces to zero at pitch point, starts decreasing and again becomes maximum at the end of the engagement. (iii) The face and flank of the teeth are generated by a single curve and the normal to this curve at any point is tangent to the base circle of the gear. (iv) The centre distance for a pair of mating gears can be varied within limits without altering the velocity ratio. Select the correct answer using the code given below.
Two 20° involute spur gears have a module of 12 mm. The addendum is equal to 1.5 module. If the larger gear has 40 teeth and the pinion has 20 teeth, find the pressure angle at which interference can be avoided.
Interference can be avoided in involute gears with 20° pressure angle by
If ‘Aman’ means ‘45’, ‘run’ means ‘5’, ‘faster’ means ‘×’, ‘but’ means ‘29‘, ‘Raja’ means ‘-’, ‘can’ means ‘÷’, ‘reach’ means ‘62’ and ‘than’ means ‘16’ then what is the value of: ‘Aman can run faster than Raja but Raja reach + 1’
Two involute gears have a pressure angle of 20°. The gear ratio is given to be 3. The module is 5 mm and the value of addendum is equal to 1 module. Determine the minimum number of teeth on each wheel to avoid interference, if the pinion rotates at 100 rpm.