6.1.2. Pressure regulator

Regulates pressure in the hydraulic drive of brake mechanisms of back wheels depending on load of a back axis of the car. It is included in both contours of the brake system and through it brake fluid arrives to both back brake mechanisms.

Fig. 6.3. Pressure regulator drive: 1 – pressure regulator; 2, 16 – bolts of fastening of the regulator of pressure; 3 – pressure regulator drive lever arm; 4 – pin; 5 – pressure regulator drive lever; 6 – pressure regulator drive lever axis; 7 – lever spring; 8 – body arm; 9 – arm of fastening of the regulator of pressure; 10 – elastic lever of the drive of the regulator of pressure; 11 – earring; 12 – earring bracket; 13 – washer; 14 – lock ring; 15 – arm finger; And, In, With — openings

The regulator of pressure of 1 (fig. 6.3) fastens to an arm 9 two bolts 2 and 16. At the same time the forward bolt 2 at the same time fixes a bifurcate arm 3 levers 5 of the drive of the regulator of pressure. On a finger of this arm pivotally a pin 4 the dvukhplechy lever 5 fastens. His top shoulder is tied with the elastic lever 10 which other end through an earring 11 pivotally connects to an arm of the lever of a back suspension bracket.
Arm 3 together with the lever 5 at the expense of oval openings under a fastening bolt, it is possible to move concerning pressure regulator. This most regulates effort with which the lever 5 affects the regulator piston (see the head "Adjustment of the drive of the regulator of pressure").

Fig. 6.4. Pressure regulator: 1 – pressure regulator case; 2 – piston; 3 – protective cap; 4, 8 – lock rings; 5 – piston plug; 6 – piston spring; 7 – case plug; 9, 22 – basic washers; 10 – sealing rings of a pusher; 11 – basic plate; 12 – pusher plug spring; 13 – ring sealing valve saddles; 14 – valve saddle; 15 – sealing laying; 16 – stopper; 17 – valve spring; 18 – valve; 19 – pusher plug; 20 – pusher; 21 – piston head sealant; 23 – piston rod sealant; 24 – cap; And, D — the cameras connected to the main cylinder; In, With — the cameras connected to wheel cylinders of back brakes; To, M, N — gaps

In the regulator there are four cameras: And yes D (fig. 6.4) connect 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 (fig. 6.4) is drawn in by the lever 5 (see fig. 6.3) through a lamellar spring 7 to a pusher 20 (see fig. 6.4) which under this effort is drawn in to a saddle of the 14th valve 18. At the same time the valve 18 is wrung out from a saddle and the gap of N, and also a gap To between a head of the piston and a sealant 21 is formed. Through these gaps of the camera A and D are reported with cameras B and C.
By pressing a brake pedal liquid through gaps To and the N and cameras B and C comes to wheel cylinders of brake mechanisms. At increase in pressure of liquid the effort on the piston seeking to nominate him from the case increases. When the effort from pressure of liquid exceeds effort from the elastic lever, the piston begins to start from the case, and after it the 12 and 17 pusher 20 together with the plug 19 and rings 10 moves under the influence of springs. At the same time the gap of M increases, and gaps of N and To decrease. When the gap of N is chosen completely and the valve 18 isolates the camera D from the camera C, the pusher 20 together with the details located on it ceases to move after the piston. Now pressure in the camera C will change depending on pressure in the camera B. At further increase in effort to brake pedals pressure increases in the D, V and A cameras, the piston 2 continues to start from the case, and the plug 19 together with sealing rings 10 and a plate 11 under the amplifying pressure in the camera B, moves towards a stopper 16. At the same time the gap of M begins to decrease. Due to reduction of volume of the camera About pressure in it, so and in the brake drive, accrues and it will be almost equal to pressure in the camera B. When the gap To becomes equal to zero, pressure in the camera B, so and in the camera C, pressure will grow in the camera A at the expense of a liquid drosselirovaniye between a head of the piston and a sealant 21 to a lesser extent, than. Dependence between pressure in cameras B and A is defined by the relation of a difference of the areas of a head and a rod of the piston to the area of a head.
At increase in loading of the car the elastic lever 10 (see fig. 6.3) is loaded more and the effort from the lever 5 increases by the piston, that is the moment of a contact of a head of the piston and a sealant 21 (see fig. 6.4) is reached with a bigger pressure in the main brake cylinder. Thus efficiency of back brakes with increase in loading increases.
At refusal of a contour of brakes "the right forward — left back brakes" sealing rings 10, the plug 19 under pressure of liquid in the camera B will be displaced towards a stopper 16 against the stop of a plate 11 in a saddle 14. Pressure in a back brake will be regulated by a part of the regulator which includes the piston 2 with a sealant 21 and the plug 7. Work of this part of the regulator, at refusal of the called contour, is similar to work at serviceable system. The nature of change of pressure at the exit of the regulator same, as well as at serviceable system.
At refusal of a contour of brakes "the left forward — right back brakes" the pusher 20 with the plug 19, sealing rings 10 is displaced by pressure of brake fluid towards the piston, nominating him from the case. The gap of M increases, and the gap of N decreases. When the valve 18 concerns a saddle 14, growth of pressure in the camera C stops, that is the regulator in this case works as pressure limiter. However the reached size of pressure is sufficient for reliable work of a back brake.
In the case 1 the opening closed by a cap 24 is executed. The liquid leak from under a cap at its expression testifies to leakage of rings 10.