8.8. A pressure regulator

Fig. 8.5. A pressure regulator: 1 – the case of a regulator of pressure; 2 – the piston; 3 – a protective cap; 4, 8 – lock rings; 5 – the piston plug; 6 – a piston spring; 7 – the case plug; 9, 22 – basic washers; 10 – sealing rings of a pusher; 11 – a basic plate; 12 – a spring of the plug of a pusher; 13 – a ring sealing valve saddles; 14 – a valve saddle; 15 – a sealing lining; 16 – a stopper; 17 – a valve spring; 18 – the valve; 19 – the pusher plug; 20 – a pusher; 21 – a sealant of a head of the piston; 23 – a sealant of a rod of the piston; 24 – заглушка; And, D – the chambers connected to the main cylinder; In, With – the chambers connected to wheel cylinders back ормозов; Е – the connecting channel; To, M, Н – backlashes

The pressure regulator (fig. 8.5) regulates pressure in a hydraulic drive of brake mechanisms of back wheels depending on loading on a back axis of the car. It is included in both contours of brake system, and through it the brake liquid arrives to both back brake mechanisms.

In a regulator is available four chambers: And and D (fig. 8.5) incorporate to the main cylinder, In – with right, and With – with left wheel cylinders of back brakes.

In a starting position of a pedal of a brake the piston 2 is drawn in to a pusher 20 which under this effort is drawn in to a saddle 14 valves 18. Thus the valve 18 is wrung out from a saddle and backlash Н, and also a backlash To between a head of the piston and a sealant 21 is formed. Through these backlashes of the chamber And and D are informed with chambers In and With.

By pressing a pedal of a brake the liquid through backlashes To and Н and chambers In and With arrives in wheel cylinders of brake mechanisms. At increase in pressure of a liquid the effort to the piston increases, aspiring to put forward it from the case. When the effort from pressure of a liquid will exceed effort from the elastic lever, the piston starts to be put forward from the case, and after it 12 and 17 pusher 20 together with the plug 19 and rings 10 moves under the influence of springs. Thus the M backlash increases, and backlashes Н and To decrease. When backlash Н will get out completely and the valve 18 isolates chamber D from the chamber With, the pusher 20 together with the details located on it ceases to move after the piston. Now pressure in the chamber With will change depending on pressure in the chamber of Century At the further increase in effort at pedals of a brake pressure in chambers D, In and And increases, the piston 2 continues to be put forward from the case, and the plug 19 together with sealing rings 10 and a plate 11 under amplifying pressure in the chamber In moves towards a stopper 16. Thus the M backlash starts to decrease. At the expense of reduction of volume of the chamber About pressure in it so and in a brake drive, accrues and it will be almost equal to pressure in V.Kogda's chamber a backlash To it becomes equal to zero, pressure in the chamber In so and in the chamber With, pressure will grow in the chamber And, for the account дросселирования liquids between a head of the piston and a sealant 21 to a lesser degree, than. Dependence between pressure in chambers In and And is defined by the relation of a difference of the areas of a head and a piston rod to the head area.

At refusal of a contour of brakes «right forward – left back brakes» sealing rings 10, the plug 19 under the pressure of a liquid in the chamber In will be displaced towards a stopper 16 against the stop plates 11 in a saddle 14. Pressure in a back brake will be regulated by a part of a regulator which includes the piston 2 with a sealant 21 and the plug 7. Work of this part of a regulator at refusal of the named contour is similar to work at serviceable system. Character of change of pressure on an exit of a regulator same, as well as at serviceable system.

At refusal of a contour of brakes «left forward – right back brakes» the pusher 20 with the plug 19, sealing rings 10 is displaced by pressure of a brake liquid towards the piston, putting forward it from the case. The M backlash increases, and backlash Н decreases. When the valve 18 will concern saddles 14, pressure growth in the chamber With stops, that is the regulator in this case works as the pressure terminator. However the reached size of pressure is sufficient for reliable work of a back brake.

In the case 1 the aperture closed заглушкой 24 is executed. The leak of a liquid from under заглушки at its expression testifies about негерметичности rings 10.

Malfunction of a regulator of pressure can be one of the reasons of drift or car withdrawal aside at braking.

It is recommended to replace a faulty regulator of pressure in gathering.

It be required to you: keys «on 10», «on 13».

1. Disconnect brake tubes from a pressure regulator, having turned away a nut of fastening of pipelines. Muffle apertures of brake tubes. Mark tubes not to mix them at the further installation of a regulator.	2. Turn out bolts of fastening of a regulator to an arm.

3. Remove a regulator.	4. For replacement of the lever of a drive of a regulator of pressure turn away a nut of fastening of the lever of a drive to a rack connecting it with a beam of the back bridge, and disconnect a lever rack...

5.... Turn on two nuts of fastening скобы the lever to a body, remove washers and скобу.	6. Turn on two nuts of fastening of an arm of a regulator to a body and remove an arm.

7. Establish a pressure regulator in an order, the return to removal.

8. Before installation check up correctness of adjustment of a drive of a regulator and if necessary execute it (Check and adjustment of a regulator of pressure »see«).

9. Pump over a hydrodrive of brakes («Prorolling of a hydrodrive of brake system» see).