Page 18 - 6476

Laboratory work № 4

CLUTCH TRANSMISSION, GEARBOX AND TRANSFER
GEARBOX OF AUTOMOBILE

1 The purpose of the work is to study the designation,
kinematic schemes, design features of powertrains, as well as
possible problems with their parts.

2 Basic theoretical provisions

Studying the power transmission of a car it is necessary to find
out its purpose, classification and requirements relating to it. After
that, examine the individual elements of the power transmission. It
is necessary to determine the types of coupling designs according
to the following classification:
- by the method of transmission of torque: friction (with
mechanical friction), hydraulic, electric, combined;
- by way of control: driver (with forced control), with
automatic control.
Couplings driven by the driver can be mechanical, hydraulic,
pneumatic, vacuum, electric and combined drive. Coupling with an
automatic drive can be controlling depending on the position of the
accelerator pedal, the speed of the engine and the gear shift lever.
Hydraulic clutches can be hydrostatic and hydrodynamic
(hydraulic clutch).
Friction clutches are the most common in cars and tractors,
which in the form of friction surfaces can be disk, tapered, belt,
shingle. At present, disc brakes are used as mechanisms separating
the engine with power transmission. The main types of friction
couplings are used as components of some gear propulsion
mechanisms, for example, as control units for planetary gearboxes.
Disc friction clutches are classified:
- by the number of disks: one-disk, two-disc, multi-disk;
- on the condition of friction pairs: dry, and those working in
oil (wet);

17