Mecanum Wheel Type-B Revision-A1

grabcad

Concept model of a Mecanum wheel with rollers breaking system. Though incredibly versatile, the standard Mecanum wheel has an unfortunate side effect which reduce its efficiency considerably. It's wide range of mobility is due to the fact that the peripheral rollers translate a portion of the driving motor force into a force perpendicular or at an angle to that produce by the driving motor. This means that large portion of the force in one direction is lost though the translation into a resulting force by the rollers. As an extreme example of this inefficiency, when the platform travel diagonally, only a front and rear opposing wheels are spinning whilst the rollers on the other two wheels cause direct drag that the motors must fight against. (Australasian conference on robotics 27-29 November 2002) This problem can be solved in a few ways: 1. controlling the rollers spins = Mecanum wheel type B. 2. Rotating the rollers assembly arm = Mecanum wheel type R. 3. Rotating the rollers assembly & control the spinning speed of the rollers = Type BR. This model is missing the fallowing: 1. Sensors & electrical harness needed to monitor rollers speed. 2. Attaching method of rollers to shaft (not a problem with free spinning rollers) 3. Controlling dumping spring tension. 4. Connecting dumber piston to rollers assembly. 5. Breaking disk piping & distribution system. 6. Universal electrical collector connections for sensors wire harness. 7. Reduction gear. 8. Rollers bearing. 9. Rollers shaft secure end nut. 10. Main wheel bearing & lubricating system. Big thank you for everyone here for the worm welcome & support :) This work is in progress... Nesher Amir I added revision A3 of Mecanum Wheel Type B with some of the missing parts & bits. However this revision is a DEAD END! The only good thing about this model is some visual appeal. 1. Enormous un-sprung weight going to be very annoying when designing suspension work. 2. Locking the roller at high speed on rough traveling ground while the rollers of have so much suspension movement will creat a vector wobble that might force you to add a gyroscopic stabilizing system to the platform. 3. Its “Drive By Wire” anyway but if you have a “vector wobble” programing the driving computer going to be a BITCH! 4. Breaking piping will be a constant unforgettable pain in the farter factory gate because of the central hub collector, you need to deliver oil to parts that are spinning, a lost oil to one of the brakes while all the rest are working will put the platform out of control if the conditions are hard enough. 5. Expensive to produce & hard to maintenance