|
|
|
35
A. Adjustment of bearing clearance
In order to ensure the normal work of the steering gear, the clearance of the bevel
bearings 7204 on either end of steering worm should be adjusted. When the bearings wear out
to make the axial clearance increase, the clearance should be adjusted timely; i.e. make the
upper and lower moving play of the steering worm be not more than 0.1mm through
increasing or reducing the quantity of adjusting shim (11).
B. Adjustment of mesh clearance of steering worm and crankpin
During operation, the mesh clearance will increase due to the wear out of the steering
worm and crankpin, and the idle angle of the steering wheel also increases. When the idle
°
angle of the steering wheel is more than 25
(or the arc length along the outside of the
steering wheel is more than 90mm), the clearance should be adjusted.
36
37
Adjusting method: loosen nut (7), turn adjusting screw (8) to make rock arm shaft (2)
move axially and therefore the mesh clearance is changed.
When the rock arm shaft is in middle position, the free travel of steering wheel outside is
°
50-55mm, i.e. the idle angle of the steering wheel is no more than 15
, then the adjustment
is suitable. After adjustment, lock nut (7).
2) Adjustment of circulating ball type steering gear
A. Adjustment of bearing clearance
In order to ensure the normal work of the steering gear, the clearance of the bevel
bearings 7304 on both ends of the rock arm shaft should be adjusted. When the bearings wear
out and the axial clearance of the bearings increases, the clearance should be adjusted in
time; i.e. make the upper and lower moving play of the steering worm be not more than
0.1mm through increasing or reducing the quantity of adjusting shim (7).
B. Adjustment of mesh clearance of rock arm shaft (with steering worm and nut
assembly) and fan teeth of rock arm shaft.
During operation, the mesh clearance will increase due to the wear out of fan teeth of the
rock arm shaft (with steering worm and nut assembly) and the idle angle of the steering wheel
will also increase; so adjustment should be made in time. Loosen nut (2), turn adjusting screw
(1) to make rock arm shaft move axially and therefore the above mesh clearance is changed
.
3)
Construction and adjustment of balance string type hydraulic steering gear
A. Working principle of balance string type hydraulic steering gears
BZZ series balance
string type hydraulic steering gears are adopted in the hydraulic steering gears of Agracat
series tractors; their structure diagram is as Fig.4-14. It is mainly made up of steering control
valve and steering measuring device.
38
Valve sleeve of the steering control valve (6) is connected with valve core (7) through
plug (5), and spring leaf is fixed in the middle of the valve. The hole in the valve core (for
mounting the plug) is a little bigger than the hole in valve sleeve (6), so they can rotate
relatively, the outside of the valve core connects with connecting piece (1).
The stator (13) and rear cover (10) of steering measuring device are fixed together with
valve body (3) of steering control valve by bolt. Rotor (9) connects with valve sleeve (6)
through connection shaft (8) and plug (5). Rotor (9) and stator (13) are balance string type
needle wheel mesh pair. The rotor has 6 short outer pendulum string curve teeth of equal
distance, while the stator has 7 arc needle teeth. During working, the stator is still and the
rotor rotates round the center of the stator at the radius of a certain eccentric distance. When
the rotor rotates round center of the stator (revolution), it also rotates round its axial line in
opposite direction (rotation). As the rotor makes a circuit and it can rotates round the stator
center for -6/(7-6)=-6 circuits, rotor makes one circuits, the oil liquid will be squeezed out
×
from the teeth slot (6
7=42), and the displacement at unit volume is large.
B. Adjustment of balance string type hydraulic steering gear.
As the rotating times or circuits of the steering wheel concern the rated displacement of
|
|
|