- World's Largest Collection of Interview Questions
Start Your Own website Now
Sponsored Links

Interview Questions
Our Services

Get 9,000 Interview Questions & Answers in an eBook.

  • 9500+ Pages
  • 9000 Question & Answers
  • All Tech. Categories
  • 14 MB Content

    Get it now !!

    Send your Resume to 6000 Companies

    Question :
    Why Involutes Curve used in Gear?
    Category Mechanical Engineering Interview Questions
    Rating (0.3) By 243 users
    Added on 6/20/2011
    Views 567
    Rate it!

    Involute curve is the path traced by a point on a line as the line rolls without slipping on the circumference of a circle. Involute curve has a contact angle between two gears when the tangents of two gears pass through the contact point without friction.

    INVOLUTE:It is a locus of a free end of a string when it is wound round a circle or polygon.
    In an involute gear, the profiles of the teeth are involutes of a circle. (The involute of a circle is the spiraling curve traced by the end of an imaginary taut string unwinding itself from that stationary circle called the base circle.)

    In involute gear design contact between a pair of gear teeth occurs at a single instantaneous point (see figure at right). Rotation of the gears causes the location of this contact point to move across the respective tooth surfaces. The path traced by this contact point is known as the Line of Action (also called Pressure Line or Line of Contact). A property of the involute tooth form is that if the gears are meshed properly, the line of action is straight and passes through the Pitch Point of the gears. When this is true, the gears obey the Fundamental Law of Gearing:[1]

    The angular velocity ratio between two gears of a gearset must remain constant throughout the mesh.

    Posted by: jagadeesh    

    Contact jagadeesh Contact jagadeesh

    In volute curves are used in the gears because-
    1)They are easy to manufacture compare to cycloidal since they are made up of single curve
    2)The change in center distance between gears within limit does not cause change in velocity ratio
    3)The pressure angle remains constant throughout the path of contact which ensures the smooth motion. this pressure angle varies in cycloidal curve

    Posted by: Ganesh Patil    

    Contact Ganesh Patil Contact Ganesh Patil

    its simple:-
    its just because involute curve satisfies the law of gearing ie: its is the curve for which the common normal at the point of contact always passes through the pitch point and hence the velocity ratio remains constant.
    there are only two curves which satisfy this condition ie: involute and cycloidal. but involute is preferred because it bears a constant value of pressure angle all the time,/.
    hopwe this helps..

    Posted by: asim    

    Contact asim Contact asim

    If you have the better answer, then send it to us. We will display your answer after the approval.
    Rules to Post Answers in

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.
  • Name :*
    Email Id :*
    Answer :*
    Verification Code Code Image - Please contact webmaster if you have problems seeing this image code Not readable? Load New Code
    Process Verification  Enter the above shown code:*
    Inform me about updated answers to this question

    Related Questions
    View Answer
    What is OEE?
    View Answer
    What is ductile-brittle transition temperature?
    View Answer
    Define torque.
    View Answer
    What is annealing?
    View Answer
    What is gear ratio?
    View Answer
    Explain the nomenclature of a 6203-ZZ bearing.
    View Answer
    Explain Otto cycle.
    View Answer
    What is PS?
    View Answer
    How many joules is 1 BTU?
    View Answer
    What is a Newtonian fluid?
    View Answer
    Define Reynolds number.
    View Answer
    What are the points in the stress strain curve for steel?
    View Answer
    What is bending moment?
    View Answer
    How do you measure temperature in a wet bulb thermometer?
    View Answer
    Explain the second law of thermodynamics.
    View Answer

    Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here - Best Freshers & Experienced Jobs Website.

    View ALL Mechanical Engineering Interview Questions

    User Options
    Sponsored Links

    Copyright ©2003-2015, All Rights Reserved.
    Privacy Policy | Terms and Conditions

    Download Yahoo Messenger | Placement Papers| FREE SMS | ASP .Net Tutorial | Web Hosting | Dedicated Servers | C Interview Questions & Answers

    Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

    Cache = 0.011719 Seconds