Browse Publications Technical Papers 2001-01-0866

Development of an Electronically Controlled Two-Way Roller Clutch for Transfer Case Applications 2001-01-0866

This paper describes a new two-way, over-running mechanical clutch and electronic control for four wheel drive systems. This package is called the “Lock On Demand” (LOD) system.
The LOD system is composed of a two-way over-running roller clutch, an electronic controller, and sensors. The controller actuates the roller clutch mechanism, putting the vehicle in 2WD or 4WD based on the information from sensors which measure speed, throttle position, brake activity, etc.
The two way roller clutch is composed of a cammed inner race, a cylindrical outer race, rollers and retainer. An electro-magnetic coil is used as the activating trigger for the mechanical clutch.
In this paper, the LOD system is introduced, and details are given for the operation of the roller clutch and controller. In addition, the results from a finite element analysis (FEA) are included.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.