Re: kingpin torque

Posted by Rod (NH) on December 26, 2002 at 20:35:42 from (12.148.160.138):

In Reply to: kingpin torque posted by 9Njoe on December 26, 2002 at 18:08:53:

Hi Joe,

I probably can help a little here. I have a pretty good technical analysis of king pin torque needed to turn a wheel. It is from an article in Machine Design Magazine from the late '50s titled "Mechanics of Vehicles". It covers the tire and wheel geometry to the king pin and resistance between the tire and a dry concrete surface (part rolling and part sliding). It applies to stationary steering. I would be glad to scan the two applicable pages and email them to you with your permission. They would be in Adobe pdf format.

You should also consider the frictional resistence in the king pin area itself. My AC-B tractor has bushings top and bottom of the "king pin", actually part of the spindle proper. The forces perpendicular to these bushings keep the the tire and wheel in the vertical position. These bushings may or may not be well lubricated. For conservative design purposes, I would consider them to be non-lubricated. My Oliver 77 Ind tractor ( a lot heavier than the B) has needle bearings top and bottom to minimize this friction.

There is also some frictional resistence to rotation at the bottom of the king pin or spindle (from the weight) that I would consider to be unlubricated for conservative design. My B has just steel-to-steel here but my Oliver has a roller thrust bearing to minimize frictional resistence.

Let me know if you want the two pages by email.

Rod

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