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Blocking  differentials  are  with  forced  blocking  and  self-locking.
           Self-locking  differentials  are  with  full  or  partial  blocking.  The
           latter are called differentials of increased internal friction.
               Simple  differentials  by  design  are  usually  geared  tapered or
           cylindrical, partial differential lock - cam, worm, gear with friction
           elements or hydraulic  friction. Differentials with full  locking are
           constructed in the form of free-flow couplings. Known designs of
           cam  differential  are  made  with  axial  and  radial  placement  of
           crackers with single row or double row.
               The drive of the driving wheels of the car is carried out with
           the  help  of  uncut  pews,  or  cut-out  semis,  equipped  with  cardan
           hinges.
               Split pivas need to be used with an independent suspension of
           driving wheels (for example, "Niva", "Zaporozhets").
               Peacocks, with the load of bending torque and axial force, are
           conditionally  divided  into  fully  unloaded,  unloaded  by  3/4  and
           semi-unloaded.
               When studying the designs of the main gear, it is necessary to
           pay attention to the shape of the gear teeth, the number, types and
           solutions of the bearings of the drive shaft, the differential box and
           the  intermediate  shaft  of  the  double  transmission;  how  is  the
           regulation of the pretensioning of the bearings and the coupling of
           the conical pair during the assembly and adjustment of the axle.
               Need to know the features of hypoid gear designs and the need
           to  use  special  grease  for  the  drive  bridge  with  a  hyoid
           transmission.
               Pay  attention  to  the  peculiarities  of  the  design  of  the  main
           transmission of the middle passage bridge of the three-axle vehicle
           increased  throughput.  On  some  vehicles  a  two-stage  main
           transmission  is  installed. Look at its design, pay attention to the
           drive  gearshift  and  the  reciprocal  position  of  elements  of  the
           planetary row when turning on lower and higher gears.
               It  is  necessary  to  know  the  structure  and  principle  of  the
           operation of differentials of different types, to find out why forced
           blocking of the differential.
               When studying the construction of semiccles pay attention to
           the shape of their outer and inner ends, the methods of connecting
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