free coupling
use new idea for gear coupling to 4by4 care which better than universal joint and cv joint
1/4

1: Families with kids

Observation

the old ideas for coupling have many problems and my new idea solve this problems. my idea depend on gear coupling that we connect the edges to the rotating shafts with by two type of gears bevel and spur gear , which enable the shaft to take any directions with uniform speed it useful with 4 by 4 care

Conclusion

i use gears to make a coupling this coupling enable the rotating shafts to take any directions with uniform speed

Solution

its idea that we connect the edge of the adjacent rotating shafts with two bevel gears, by this the one rotating shaft have one bevel gear , we but a third bevel gear between this two bevel gears to the two shafts and connect all two axis of this three bevel gears with arm, so the axis of first bevel gear of shaft one connect with axis of third bevel gear with arm, and the axis of second bevel gear to shaft two connect to axis of third bevel gear with second arm.