11.2.9. Features of a back suspension bracket of cars 4 х 4

THE GENERAL DATA

Elements of a back suspension bracket (the power unit 4 х 4)

1 – a cross-beam of a back suspension bracket, 2 – a fastening support to a body, 3 – a metallo-rubber element, 4 – the buffer of a suspension bracket, 5 – the lever of a suspension bracket, 6 – the basis of a nave, 7 – a nave, 8 – a nut of a semiaxis,

9 – the bearing, 10 – an adjusting ring, 11 – an operating shaft, 12 – a casing, 13 – the cylinder, 14 – a branching, 15 – a tank

Height check h a back suspension bracket

Cars Peugeot 405 with a drive on four wheels (4 х 4) are equipped by a hydropneumatic back suspension bracket thanks to which the constant height of a back part of a body irrespective of loading on the car remains.

The special tank filled with nitrogen, is exposed to influence of elements of a suspension bracket by means of a hydraulic contour. Gas acts in this case as a spring, and oil, дросселируемое in the calibrated pipelines, plays a shock-absorber role. Instead of influence on a screw spring the suspension bracket lever influences the piston which will transform this influence to wheel moving. Preservation of the basic pressure is an indispensable condition for maintenance of normal height of a suspension bracket. This pressure is created by the hydraulic pump put in action by an electric way. Necessary pressure is defined by the switch which action depends on body height.

Irrespective of loading on the car the body height is constant.

The back suspension bracket has two special levers, established on the conic bearings which tightness is provided with sealing rings. Each of levers has a round aperture from outside naves driving semiaxes. Also each lever has a nest for the spherical hinge of the intermediate shaft transferring movement to the cylinder of a suspension bracket.

Each of two cylinders of a suspension bracket has the piston and an element connecting it with the lever of a suspension bracket, a consolidation and detection casing потеков, connection with амортизирующим an element and a branching submitting a liquid to a tank.

The tank is adjusted on pressure 4,0 МПа and has four connections: with two cylinders of a suspension bracket, with the hydraulic pump of a high pressure and with a pressure regulator.

The hydraulic pump joins the gauge of height of the body, connected to the stabilizer by means of connectors.

Электрически the operated valve plum opens an exit of a liquid in case of too high pressure (reduction of loading by a luggage carrier, reduction of loading by a back suspension bracket).

The tank of a hydraulic liquid provides a contour food. In it surpluses of a liquid and a liquid arrive at opening of the valve plum. From this tank the liquid moves in the high pressure pump through the filter.

The pressure regulator will co-ordinate force of braking with loading on 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 13,5 МПа.

The cross-beam of a back suspension bracket bears all elements, and also driving the bridge. It fastens to a body in front by means of two elastic support, and behind – by means of two metallo-rubber elements.