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NOTICE: Get Ready for Hunting Season!!! All new 2011 Honda 4x4 Utility ATV's are just now arriving. Check out the incredible Honda "Big Red" Utility Vehicle. We always stock a large variety and these units are priced to sell!! 
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| Lehman Trikes, Inc. Drive System
| There are three main components to a basic drive shaft system:
1.Front universal joint
2.Drive shaft, and
3.Rear universal joint
The purpose of the shaft is to transfer power from the motorcycle transmission to the differential. The universal joints are required because the differential must travel through a range of motion allowed by the suspension.
Driveshaft Angle
All universal joints are designed to have a minimum of 1/2 degree of working angle. This angle is necessary in order to keep the needle bearings contained in the caps rolling. At angles less than 1/2 degree, the needles stay locked in the same position and wear into the cap, causing vibration and eventually failure.
Vibration
All universal joints vibrate. This is a property due to the design of the joint.
So the next question is: "If universal joints vibrate, then why does my car not vibrate?"
When a drive shaft is designed for application in a car, the joints are always in pairs. When there are two joints, they can be phased so they cancel each other out and no vibration is felt.
The universal joints work as follows:
When the output shaft turns, the two caps of the front universal joint must turn around the center of the output shaft.
The other two caps on the universal joint must turn about the center of the drive shaft.
Because the drive shaft is at some angle to the output shaft, the cross of the universal joint must wobble back and forth to allow the bearing caps to trace these circles out while rotating.
This causes the rotating speed of the drive shaft to fluctuate on every turn, at first speeding up slightly faster than the output shaft, then slowing to slightly below the output shaft speed. If this effect is not counteracted with a second universal joint, it will create vibrations.
At the other end of the driveshaft, there is a second universal joint. This joint is timed to the front universal joint in order to be exactly opposite to it. When the drive shaft speeds up from the action of the front universal joint, the action of the rear universal joint slows it down, and vice versa. This produces a constant shaft speed at the differential shaft.
Automotive drive shafts are not straight for the reasons explained above. If a shaft were designed to run perfectly straight, U-joints would not be required. As the rear end moves up and down, the drive shaft can never remain perfectly straight.
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Rod's Honda Rider's Club - Prarie Red Riders, Meets at the dealership every Thursday evening for a dinner ride during the riding season. Kickstands up at 6:30..."Come Ride With Us" We have over 40 Bushtec Trailers IN STOCK and at factory direct pricing. Get yours ready today!!
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