×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Anti-backdrive mechanism

Anti-backdrive mechanism

Anti-backdrive mechanism

(OP)
Dear all,
I am looking for light weight mechanism which will connect to the gearbox output. This mechanism will be free to rotate when backdrive torque was applied to the gearbox output without transmitting this movement to the gearbox and the motor. However, it will transmit the movement when driving torque was appling from the motor. I was thinking to use clutch, but the main problem is the weight of clutch because the transmitted torque is around 100N.m. I am looking for a mechanism has a weight less than 0.5kg and working as anti-backdrive without preventing the load from the movement.

RE: Anti-backdrive mechanism

(OP)
Dear James,
This is very good clutch, and lightweight. However, it allows the rotation in one direction. The problem that the backdrive movement might be in CW or CCW directions. I want a mechanism of clutch which works when the motion applied from the motor and doesn't work when the motion applied from the output in both clock-wise and counter clock-wise directions.
Best regards,
Mohammed  

RE: Anti-backdrive mechanism

(OP)

For more detail, I am looking for lightweight clutch which weighs less than 0.5kg which works in both CW and ACW direction. This clutch works only if the torque applied from the input side either in CW or ACW, and doesn't work when torque applied in the output side. This clutch/mechanism will work at low speed (75rpm), and the maximum torque is 150N.m.

RE: Anti-backdrive mechanism

Google up "wrapped spring clutch" and "overrunning clutch".

James Spisich
Design Engineer, CSWP

RE: Anti-backdrive mechanism

(OP)
but this is works only in one direction either CW or ACW.

RE: Anti-backdrive mechanism

(OP)
I am looking for Bi-directional overrunning clutch becuase I don't want to backstop the backdrive action, but I want it overrun it.I mean that the clutch disengages automatically when the driven member rotates faster than the driving member in both CW and ACW with the following specifications:
Maximum torque=150N.m
Continous rated torque=50N.m
maximum working speed=75rpm

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources