Oil and Bearings a.k.a. Hydrodynamic Bearings - FWIW - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-17-2008, 09:36 AM
Stroke Meister
 
Last photo:
Join Date: Mar 2007
Location: MI, USA
Posts: 704
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Oil and Bearings a.k.a. Hydrodynamic Bearings - FWIW

A good read for anybody interested...

Quote:
Hydrodynamic Bearings

Journal bearing design is complex. It involves optimizing clearances, bearing length, minimum film lubricant, viscosity, flow rate, and inlet slots. Design equations are available, but their solution is time consuming unless done on a computer. Fortunately, these equations have been reduced to chart form, and a wide variety of design problems can be solved with various charts in the literature.

For more info see this link http://www.bearings.machinedesign.co...emech6_18.aspx

    Advertisement

Last edited by engineczar; 03-18-2008 at 05:52 AM. Reason: Copy-pasting. Please see: copy-pasting guidelines.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-25-2008, 08:55 AM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,384
Wiki Edits: 21

Thanks: 1
Thanked 4 Times in 4 Posts
Good link. Yes hydrodynamic bearings are quite complex. Big section of Shigley's Machine Design text devoted to it. Guaranteed question on the final of any ME machine design course.

The principle of this bearing was developed on early railroad truck axles (a whole bunch of mechanical engineering technology came from railroads). Designers were using wooden bearings on the truck axles, lubed with animal fat. The lube was filled from the top but kept leaking out the hole on top of the bearing. They tried all kinds of plugs for that hole but the plugs quickly blew out, even threaded ones. Finally did the math and determined that viscous lubricants 'wedged' themselves into the space between the axle and bearing and pressured up to whatever pressure it took to support the two parts on a couple molecules of lube. The hydrodynamic effect actually 'pumps' the lube to very high pressures and prevents metal to metal contact. Lube viscosity vs. temperature, lube temperature tolerance, bearing material pressure and temperature tolerance, surface finish, width and diameter of bearing (needs to be wide and long enough to carry the load, not so wide that friction heat destroys metals and lube), assembly methods, etc. all have to be considered for a successful design.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is it no good to have a High volume oil pump? Calderone Engine 17 01-31-2008 05:26 PM
oil psi problem w/350 A355CAMARO Engine 2 04-19-2007 07:25 AM
Oil filter Super Magnets? Jag Daddy Engine 59 02-01-2006 07:36 PM
Oil Temperature and oil types (long) TurboS10 Engine 36 03-01-2005 01:51 PM
Tip of the day on oil additives that you need to read mcgyver-ky Engine 10 04-19-2003 05:17 AM


All times are GMT -6. The time now is 04:51 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.