The main parameters tested before ASSEMBLY MAIN TRANSMISSION
Mounting dimension C represents the distance from the end
pinion to the axle differential. Theoretical assembly
size is 53.4 mm.
However, the selection of couples in the control machine to ensure
proper xcontact on teeth and reception with silent
of the driven and driving gears is moved along itxsaxis.
Thus violated the theoretical size of the installation and
introduced its first amendment.
In addition, the height of the head pinion is different
(Within tolerance) and, therefore, after the measurement of its nominal
the height of the second amendment is made. The sum of these two amendments
(Deviations) recorded electrographic at the ends of the leading and
the driven gears as a general amendment to the theoretical size of the mounting S.
If the number of amendments is "+" sign, it must be subtracted from the amount
53.4, if the sign "-", it must be added. This result is
be the nominal size of a given pair of erection. Acceptable
deviation from this size when the main gear assembly 0.02;
The lateral clearance between the mating teeth of a pair of master and slave
gear is needed due to temperature changes that occur in
during work site, the need to correct location
the xcontact of the teeth and as a result of errors
geometrical parameters in the processing of teeth
For the main transmission gear backlash measured along the normal
the profile of the tooth driven gear (Fig. 111), should be located in
range 0,10-0,22 mm, but for each individual
taken a pair of gears is the difference between the maximum and minimum clearance
shall noxtexceed 0.08 mm. The increase in the gap should be
smooth, the difference between the two side of the gap adjacent teeth
shall noxtexceed 0.03 mm.
Preload bearings pinion axis creates
load occurs when tightening the nut and the pinion
adjustable by means of the spacer.
Preload is determined by the moment of friction in the bearings
(After the final tightening of the nut), which should be in
range 0.15-0.25 kgesm.
Measurements of friction torque produce after turning pinion
10-15 revolutions required for the release of working surfaces
bearing grease on the conservation and acquisition
their working conditions.
Verified by the friction torque using the special tool
(Figs. 112, 113). In its absence, the friction torque can be checked
hand. When turning the hand flange mounted on
pinion slots, be felt some resistance
rotation, is not defiant, however, undue stress hands.
Excessive increase in preload may lead to
premature wear of bearings, and even to their jamming and exit
out of order.
Too little preload leads to an axial
backlash pinion, to the deterioration of link pairs, wear of the teeth,
to the gritting of the motion of the car coast down.