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to pay attention to the peculiarities of structures that provide the
requirements for them, as well as to know the advantages and
disadvantages of each design; determine the type of box by
classification.
Step-by-step transmissions of modern cars are equipped with
synchronizers. When considering the designs of the gearbox and
the work of inertial synchronizers, special attention should be paid
to ways of preventing the inclusion of transmission at uneven
angular velocities of the interconnected parts; be able to show the
locking surfaces of synchronizers and explain what forces act on
them at alignment of angular velocities.
It is necessary to know the purpose, structure and work of
locks, latches and locking devices, which are installed in the
mechanisms of control stepped gearbox and distribution box. It is
necessary to find out how and for what in distribution box the
inclusion of a lower transmission with the excluded drive of the
front diving axle is eliminated.
In the distribution box with a differential drive pay special
attention to the placement and construction of the inter axle
differential, and to find out in what ratio is distributed torque
between the driving bridges of the car.
It is necessary to study the design of the speedometer drive
and know where it is located - in the gearbox or distribution box.
It is necessary to determine the type of lubrication system of
each tested gearbox consider its work, pay attention to the
placement of fill and outlet in the crank case, to seal the joints and
holes for the exit of the shafts in the crankcase or the ventilation of
the crankcase.
Studying the work of all gearbox it is first necessary to find
out what parts are transmitted torque on all gears of the front and
rear passage, to know, through what parts of the mechanical drive,
the effort is transferred from the switch lever to the switch
mechanism; to know the materials of the main parts of the gearbox
and distribution box lubricant brands used for lubrication.

3 Directions for preparation for the lesson

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