×
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

Automatic Transmission clutch losses?

Automatic Transmission clutch losses?

Automatic Transmission clutch losses?

(OP)
Has anyone ever measured parasitic losses from the clutch packs of various Manufactures of Automatic Transmissions?
What I mean is say, with the transmission in top gear, the unapplied clutches will be coasting and washed in Transmission fluid, so there is a certain amount of drag or loss from this. Also I realize it will be different from transmission design and clucth pack size and design. I'm just looking for some close approximations.
Thank you.

RE: Automatic Transmission clutch losses?

icrman,

From SAE Paper 1999-01-1259, clutch pack drag parasitic losses in a typical AT represent about 75% of losses in the transmission. The total losses in an AT can be from 10% to 20% depending on the operating conditions.

Worst case, 75% of 20% would be 15%. Close enough for you?

Regards,
Terry

RE: Automatic Transmission clutch losses?

(OP)
How about band type clutches. Is there any info on them?

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