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


Hydraulic motor sizing

Hydraulic motor sizing

Hydraulic motor sizing

Hello Everyone:

I am designing a winch that would have a pull force of 20,000 lb. I determined that the torque required for it to move is 80,000 lb.in (I multiplied the force by the radius of the drum basically). I have selected a planetary drive that would give me a reduction of approximately 31:1 and now I am trying to select a hydraulic motor that would give me the required torque. I determined that I need torque of approximately 2500 lb.in but I fail to be able to select a suitable motor. would someone please help me?


RE: Hydraulic motor sizing

What will be your operating pressure?


RE: Hydraulic motor sizing

Torque equals psi times cu.in./rev displacement divided by 2π


RE: Hydraulic motor sizing

2500 PSI. so I need approximately 6 in3/rev. what type of motor do you suggest?

RE: Hydraulic motor sizing

A gear motor. Look at Eaton CharLynn gerotor/gerolor motors.


RE: Hydraulic motor sizing

awesome thanks Ted.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close