57
Fig. 44. Towing Unit:
1-nut; 2-housing; 3-pressure ring; 4-elastic element 5-towing hook; 6-guide bushing;
7,9-grease nipples; 8-locking cotter pin; 10-retaining strip; 11-bolt
Truck Suspension
The front suspension
(Fig. 45) consists of two longitudinal semielliptic springs,
which operate in conjuction with two two
-
way hydraulic shock absorbers of telescopic
type. Upper eyes of the shock absorbers are fastened via rubber bushings to the
clamps of brackets 5, while the lower eyes to brackets 17, which are welded to the
axle case.
In their middle part the springs are secured on the axle case by means of the U
-
bolts. Rubber buffers 2 retain the axle’s upwards travel and are secured in spring pads
20 and holders 13 of the auxiliary buffers. Holder 13 is connected with bracket 6,
which is secured to the frame side
-
member. Besides, the auxiliary buffers reduce
tension in the springs when abruptly braking, thus limiting twisting of the springs.
Eyes 22 are secured onto the spring front ends by means of U
-
bolts 21 and
bolts 24. Through the eye the springs are connected with front brackets 1 by pins
19, which are locked in the brackets by wedges 23.
The spring rear ends enter freely the eyes of rear brackets 8. The axle’s
downwards travel is retained by catching the bending of the spring’s third leaf end on
lower bolt 11, which fixes the the brace of the spring rear bracket, on which spacing
sleeve 12 is fitted.
To reduce tension in the frame side
-
members, the spring rear brackets in
the area of the second cross
-
member are connected by brace 16, which is bolted
to the brackets. The bolts are locked by plates 15.
The front suspension of the trucks powered with the YAMZ-238M2 engine
features a reinforced spring. The third and forth leaves of the spring are 12 mm thick
while the other ones, 10 mm thick, do not differ from the spring leaves used on the
trucks powered with the YAMZ-236M2 engine
.
Hydraulic shock absorbers
(Fig. 46) are intended for damping vibrations
resulting from elastic deformation of the truck suspension parts when travelling
on rugged road. The principle of operation of hydraulic shock absorbers is the
