11.2.9. Features of a back suspension bracket of cars 4 x 4Elements of a back suspension bracket (power unit 4 x 4)
|1 – cross-piece of a back suspension bracket,
2 – a fastening support to a body,
3 – metal-rubber element,
4 – suspension bracket buffer,
5 – suspension bracket lever,
6 – nave basis,
7 – nave,
8 – half shaft nut,
|9 – bearing,
10 – adjusting ring,
11 – the operating shaft,
12 – casing,
13 – cylinder,
14 – branching,
15 – tank
Check of height of h of a back suspension bracket
The Peugeot 405 cars with the drive on four wheels (4 x 4) are equipped with a hydropneumatic back suspension bracket thanks to which the constant height of a back part of a body irrespective of load of the car remains.
The special tank filled with nitrogen is affected by suspension bracket elements by means of a hydraulic contour. Gas acts in this case as a spring, and oil, drosseliruyemy in the calibrated pipelines, plays a shock-absorber role. Instead of impact on a screw spring the lever of a suspension bracket influences the piston which will transform this influence to movement of a wheel. Preservation of the main pressure is an indispensable condition for ensuring normal height of a suspension bracket. This pressure is created by the hydraulic pump put in action in the electric way. Necessary pressure is defined by the switch which operation depends on body height.
Irrespective of load of the car height of a body is constant.
The back suspension bracket has two special levers installed on conic bearings which tightness is provided with sealing rings. Each of levers has a round opening from a nave of a driving half shaft. Also each lever has a nest for the spherical hinge of the intermediate shaft transferring the movement to the suspension bracket cylinder.
Each of two cylinders of a suspension bracket has the piston and an element connecting it to the suspension bracket lever, a casing of consolidation and detection of potek, connection with a shock-absorbing element and the branching giving liquid to a tank.
The tank is adjusted on pressure of 4,0 MPas and has four connections: with two cylinders of a suspension bracket, with the hydraulic pump of high pressure and with pressure regulator.
The hydraulic pump turns on the body height sensor connected to the stabilizer by means of connectors.
Electrically the operated valve of discharge opens a liquid exit in case of too high pressure (reduction of load of a luggage carrier, reduction of load of a back suspension bracket).
The tank of hydraulic liquid provides contour food. Surplus of liquid and liquid when opening the valve of discharge come to it. From this tank liquid moves in the pump of high pressure via the filter.
The regulator of pressure will coordinate braking force with load of a back axis (depending on pressure in a contour).
The special switch attached to the holder of a tank limits pressure to the maximum value of 13,5 MPas.
The cross-piece of a back suspension bracket bears all elements, and also the driving bridge. It fastens to a body in front by means of two elastic support, and behind – by means of two metal-rubber elements.