75
slide valve and its body, via drain pipe to the tank. In this case the
booster cylinder chambers are under equal pressure, and the piston does not move.
Fig.58. Steering Gear ( Worm - Side Segment Type):
1-steering gear case; 2-radial roller bearing; 3-worm; 4,34-plugs of filler and drain
holes; 5-steering segment; 6-steering wheel shaft; 7,24,26-collars; 8-thrust bearing;
9-spring washer; 10-packing ring; 11-plunger; 12-spring; 13-slide valve nut; 14-
packing ring; 15,16-retaining rings; 17,20-pins; 18-side case cover; 19-shims; 21-
gasket; 22-spacing sleeve; 23-needle bearing; 25-steering pitman arm; 27-slide valve
body cover; 28-movable plunger ring; 29-bolt; 30-valve body; 31-slide valve; 32-
packing ring; 33-thrust washer; 35-cover; 36-worm nut
When turning the steering wheel, due to reactive forces appearing in “worm-
segment” pair the worm and steering shaft with the slide travel axially. The dis-
placement required is obtained by bearing’s 2 design. As the slide travels about
fixed slide body 30, one of the booster cylinder spaces gets connected with
high-pressure line, while the other with drain line. Due to it, the cylinder rod of
the booster moves until the steering wheel ceases to turn. The rod motion is
transferred to the steerable wheels via ball pin and steering knuckle arm. When
turning the steering wheel to the left or to the right, the oil flow in the booster is
changed.
Steering gear with distributor
(Fig. 59) comprises screw 7 and ball nut-rack
8 engaged with segment 1. Semicircular spiral grooves available on the screw and
nut-rack form a channel. During assembly of the steering gear the channel is
filled with high-accuracy balls 6.
Splined segment 1 is mounted in bearings 18, which are pressed into bushings
21 featuring a number of holes on their faces provided for meshing adjustment.
Axis of bearings’ 21 outer surfaces are offset about the holes of bearings 29 by
an amount of eccentricity “e”, which makes possible to adjust meshing “segment
- nut-rack”.
The mark available on the splined face of segment 1 matches with the mark
on the pitman arm end face.
