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for  kinematics  are  uneven  angular  velocities  (simple,
           asynchronous) and equal angular velocities (synchronous).
               Cardan  equal  angular  velocities  by  design  are  divided  into
           balls  with  dividers,  balls  with  a  dividing  lever,  cam  (disk),  dual
           simple (duplex). Full cardan angular angular velocities by design
           are  rigid.  Half-cards  (connecting  couplings)  are  rigid  ball  or
           dentate, soft (elastic) and combined.
               It  is  necessary  to  know  what  requirements  apply  to  cardan
           hinges.
               Studying  the  principle  of  the  hinge  of  unequal  angular
           velocities, it is necessary to pay attention to its construction, which
           bearings are installed between the forks and the cross-section, how
           their lubrication, sealing and the output of excess lubrication from
           the cross-section occur.
               Cardan hinges of equal angular velocities successfully operate
           at large angles between shafts (30-40 °), so they are usually set in
           the  drive  of  the  driving  and  steering  wheels  of  vehicles  with  a
           front-wheel  drive  or  with  all  the  driving  wheels.  In  a  ballistic
           cardboard  with  dividing  ramps,  peripheral  balls  at  an  arbitrary
           angle between the connecting shafts divide this angle in half.
               The driving axle of the car consists of the main transmission,
           the  differential  and  the  drive  to  the  driving  wheels.  The  main
           transfers are classified:
               - by the number of links: one-stage, two-stage;
               - by design: gear, worm, chain;
               - by the number of coupling pairs: single, double, complex.
               The  most  common  gear  gears,  which,  by  design,  are
           cylindrical with straight, oblique and chevron tooth, conical with
           straight or curved teeth. The variegatedness of a conical gear with
           curvilinear teeth is a hyoid transmission, the axes of which do not
           intersect, but cross over.
               Differentials are classified:
               -   by appointment: inter-wheel, inter-axle, inter-grade;
               -  by  the  nature  of  the  torque  distribution:  symmetric,
           asymmetrical, self-locking;
               -   by design: gear, worm, cam, with couplings of free running;
               -  by  principle  of  operation:  simple,  and  with  blocking.
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