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thanks alot skimask for your interesting information, I learn new things about open differential , I read it but I can't distinguish between straight and turn mechanisms and what happened and what is the thing make this machanisms straight or turn.

http://auto.howstuffworks.com/differential2.htm

In an automotive differential, you have 4 pinions or "spider gears" 2 of which are attached to either axle. the other two are driven by the carrier through the common shaft which goes through the carrier. The carrier is driven by an attached Ring and Pinion set which allows for a 90 degree change in direction of power. the 4 pinions or spider gears are in constant mesh and as the assembly is rotated by the carrier around the axles axis, it allows the axles to turn at a constantly changing ratio from zero difference to 100% difference depending upon the load applied to each. If one wheel loses traction that wheel will spin wildly, while the other wheel remains motionless.