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Written by: gproudley
7/14/2008 2:07 PM

FLAT TYPE DIFFERENTIAL FOR TRUCKS AND REAR WHEEL DRIVEN CARS

 

Introduction

 

Consider this scenario - A truck driver comes across some debris on the road such as a rock or something dropped from another vehicle.  The truck driver swerves to avoid the debris by steering the front wheels to straddle the obstacle.  That works for the front wheels, but the hub of the differential hits the obstacle.  The casing of the hub is damaged, lubricating oil leaks, and the truck and driver are soon stranded at the side of the road.  This is a common scenario.

 

The idea to develop a Flat type differential came from several incidents of trucks getting hit by rocks or obstacles on the road, which drivers can’t always avoid because of traffic. Often the damage goes un-noticed by the driver until the lubrication oil leaks out, leading to a costly repair.

 

Why a Flat type Differential?

 

Flat type differentials can reduce the risk of hitting rocks and other obstacles on the road. With a flat type differential, the driver only has to judge whether the obstacle can be straddled without hitting the front axle.  If so, the rear axle will also pass over the obstacle. Moreover, a flat type differential simply looks better.  

 

Please see the figure below.

 

 

 flatdif.gif

 

 

I’m interested in speaking to an automotive engineer or other representative of an automotive manufacturer about advancing this design and project. Contact me at the email below to discuss further.

 

Submitted by: 

P. Premnath

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2 comments so far...

Re: Flat Differential

Dear Mr Premnath

I'm a student at RPI studying mechanical and aeronautical engineering as well as an all around car guy... I'm not an official representative or auto manufacturer... I'm just simply curious about how your differential works... I know your probably reluctant to give away a new idea to someone, but if you could just explain a little bit on how your idea works I would love to hear it....

I'm not sure how auto-oriented you are, but if it does help, you should know that with a four wheel driven vehicle, rocks and other "high spots" are usually only seen off road or under very bad roads.... Though these obstacles are tough one of the main problems is applying correct amount of torque to each wheel... the trick they use today is Posi-rear's or limited slip differentials .... or another system called a locking rear which is for even more extreme situations....

When looking at your design it seemed like your aiming at just clearance issues.... I just didn't want you to forget the power and traction issues as well.... again i dont know how your design works or if you thought of that all ready but just thought it was worth reminding.... And again i dont blame you if u dont want to release your idea .... just a car guy wanting a look-see..

If you want to respond back you can reach me at my email necedm@rpi.edu

Thanx!!
Mike Neceda

By Neceda on   7/20/2008 2:12 AM

Re: Flat Differential

Very good explanation there Neceda. I think that often people when writing forget some of the most important factors and therefore without complete information it can cause people to go a stray. It is clear that the person was just looking at the clearance issues and did not seem to care about the traction and power issues as you or I would have.

By Attagirl on   12/5/2008 10:41 AM

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