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Pic. 26. Brake drive.
1. Contact device housing: 2. Fixed contact; 3. Movable contact; 4. The body of the terminal device; 5. Tank cover; 6. Reflector; 7. Pusher; 8 Float, 9. Piston O-ring; 10. Spring; 11. Spring plate; 12. Piston head seal; 13. Sleeve; 14, Pressure regulator body plug; 15. Pressure regulator housing; 16, Pressure regulator piston; 17. Front brake disc: 18. Vacuum booster; 19. Master cylinder; 20. Master cylinder reservoir: 21. Front brake caliper: 22 Front brake guard; 23 Vacuum pipeline; 24. Fitting for pumping the rear brake drive; 25. Pressure regulator; 26 Stop light; 27. Rear brake wheel cylinder; 28. Brake shoe; 29. Cable guide; 30 Guide roller; 31. Parking brake lever; 32. Stoplight switch; 33. Brake pedal; 34. Fitting for pumping the drive of the front brakes; 35. Cable end flange: 36. Rear cable; 37, Front cable; 38. Bracket for parking brake lever; 39. The return lever of the parking brake; 40. Latch lever; 41 Parking brake indicator switch stop; 42 Latch latch rod; 43. Parking brake lever button: 44 Front brake piston; 45. Piston return spring; 46. Piston stop screw; 47. Front brake drive piston; 48. Plug of the main cylinder body; 49 O-ring spring seat; 50. O-ring spring; 51. O-ring: 52. Fitting; 53. Lock washer: 54. Gasket; 55 Thrust washer; 56. Spacer sleeve; 57. Valve; 58. Hose tip; 59. Stock; 60. Valve body return spring; 61. Valve body diaphragm: 62 Vacuum booster valve body; 63. Vacuum booster housing cover; 64. Buffer rod; 65. Thrust plate piston; 66. Valve piston; 67. Seal of the cover of the vacuum booster housing; 68. Vacuum booster valve; 69. Air filter; 70. Valve lifter; 71. Valve body protective cover: 72. Vacuum booster body; 73. Stem seal: 74. Stem seal cage; 75. Stem adjusting bolt; I. Master cylinder reservoir; II. Pressure regulator; III. Brake drive scheme; IV. Master cylinder and vacuum booster; V Parking brake actuator.
1. Contact device housing: 2. Fixed contact; 3. Movable contact; 4. The body of the terminal device; 5. Tank cover; 6. Reflector; 7. Pusher; 8 Float, 9. Piston O-ring; 10. Spring; 11. Spring plate; 12. Piston head seal; 13. Sleeve; 14, Pressure regulator body plug; 15. Pressure regulator housing; 16, Pressure regulator piston; 17. Front brake disc: 18. Vacuum booster; 19. Master cylinder; 20. Master cylinder reservoir: 21. Front brake caliper: 22 Front brake guard; 23 Vacuum pipeline; 24. Fitting for pumping the rear brake drive; 25. Pressure regulator; 26 Stop light; 27. Rear brake wheel cylinder; 28. Brake shoe; 29. Cable guide; 30 Guide roller; 31. Parking brake lever; 32. Stoplight switch; 33. Brake pedal; 34. Fitting for pumping the drive of the front brakes; 35. Cable end flange: 36. Rear cable; 37, Front cable; 38. Bracket for parking brake lever; 39. The return lever of the parking brake; 40. Latch lever; 41 Parking brake indicator switch stop; 42 Latch latch rod; 43. Parking brake lever button: 44 Front brake piston; 45. Piston return spring; 46. Piston stop screw; 47. Front brake drive piston; 48. Plug of the main cylinder body; 49 O-ring spring seat; 50. O-ring spring; 51. O-ring: 52. Fitting; 53. Lock washer: 54. Gasket; 55 Thrust washer; 56. Spacer sleeve; 57. Valve; 58. Hose tip; 59. Stock; 60. Valve body return spring; 61. Valve body diaphragm: 62 Vacuum booster valve body; 63. Vacuum booster housing cover; 64. Buffer rod; 65. Thrust plate piston; 66. Valve piston; 67. Seal of the cover of the vacuum booster housing; 68. Vacuum booster valve; 69. Air filter; 70. Valve lifter; 71. Valve body protective cover: 72. Vacuum booster body; 73. Stem seal: 74. Stem seal cage; 75. Stem adjusting bolt; I. Master cylinder reservoir; II. Pressure regulator; III. Brake drive scheme; IV. Master cylinder and vacuum booster; V Parking brake actuator.
The hydraulic drive includes a brake pedal 33, a vacuum booster 18, a master cylinder 19, a reservoir 20, a rear brake pressure regulator 25, wheel brake cylinders, pipelines and hoses.
The vacuum booster reduces the force applied to the brake pedal when braking. Between the housing 72 and the cover 63 of the vacuum booster, the outer belt of the rubber diaphragm 61 is clamped, separating the booster into vacuum and atmospheric cavities. The vacuum cavity is connected to the engine inlet pipe through a hose with a tip 58 and a valve. To seal the connection, the hose tip is connected to the amplifier through a rubber flange.
Inside the vacuum booster there is a plastic valve body 62, the shank of which, at the exit from the cover of the vacuum booster, is sealed with a seal 67. It is installed in the socket of the cover and is pressed against the flange of the socket with a distance ring, which is locked with a retaining ring. To protect the movable shank of the valve body from contamination, a corrugated protective cover 71 is put on the flanged part of the amplifier body and on the shank of the valve body.
A buffer 64, a piston 66 with a pusher 70, a rubber valve 68, springs with support cups and an air filter 69 are placed in the valve body. A channel is made in the body 62 through which the atmospheric cavity is connected to the vacuum one.
The thrust plate 65 enters the groove of the piston 66, the other end of which abuts against the belt of the diaphragm 61, which prevents it from falling out. The plate 65 fixes the piston assembly with the pusher 70 and the valve 68 in the housing 62. The rod 59 of the master cylinder piston drive rests against the buffer 64. At the outlet of the vacuum booster housing, the rod is crimped by a seal 73, which is pressed by a clip 74 to the seat of the booster housing. A bolt 75 is screwed into the end hole of the rod, which regulates the output of the rod from the amplifier housing (1.05-1.25mm). The ball head of the pusher 70 is crimped into the piston seat.
Rubber valve 68 is assembled on the pusher. The movable valve head, reinforced with a metal washer, is pressed by a spring through the support cup to the rear end of the piston (at full disengagement). The body 62 has a seat for the moving valve head. The fixed shoulder of the valve 68 is pressed by a spring through the support cup to the inner wall of the valve body shank, creating a reliable seal. To clean the atmospheric air, a foam air filter 69 is installed in the shank of the valve body. The valve body is constantly pressed by the spring 60 towards the cover 63. The body and the cover of the amplifier are connected to each other by inserting the protrusions of the cover into the depressions of the body and further turning the cover to plant its edges under the protrusions corps. The connector of the cover and the housing is sealed with a shoulder of the rubber diaphragm 61, sandwiched between them.
The main cylinder 19 is attached with two pins to the vacuum booster. On top of its body, there are three threaded holes for fittings of pipelines that drain fluid into the front and rear brake drive circuits, and two sockets in which fittings 52 are fastened with lock washers, connected by hoses to tank 20. The inner bore of the cylinder is machined with great precision and high cleanliness surfaces. On the one hand, the cylinder cavity is closed with a plug 48. Two pistons are installed in series in the cylinder, one of which actuates the rear brakes, the other - the front ones. Return springs 45 are installed between the plug and piston 47, as well as between pistons 47 and 44, under the action of which they return to their original position when released. In this case, the stroke of the pistons is limited by screws 46, the shanks of which go into the longitudinal grooves of the pistons.
The piston 47 of the rear brake actuator is sealed in the cylinder with two rings 51. The front ring is pressed against the end surface of the groove by the spring 50. The other end of the spring rests against the cup 49. The rear ring is pressed against the end of the piston by the spring 45 through the washer 55.
The front brake actuator piston 44 has a similar seal, only the rear ring is located in the piston groove and has a different shape.
Spacer sleeves 56 are loosely put on both pistons. In the initial position of the piston, the spacer sleeve, resting against the locking screw, removes the sealing ring from the end of the groove. At the same time, through the resulting gap, the working cavity of the cylinder communicates with the tank 20. The groove of the front sealing ring through the radial holes and the axial channel in the piston communicates with the working cavity of the cylinder. Therefore, when the fluid pressure increases in the working cavity, the sealing ring is pressed more tightly against the cylinder mirror.
Tank 20 is two-section, made of translucent plastic, which provides visual control of the liquid level. At the bottom of the tank body there are two tips for connecting hoses. A cap 5 is screwed onto the filler neck, which presses the body 4 of the terminal device and the reflector 6 to the end of the neck. In case 1, a device for monitoring the level of liquid in the tank is mounted. It consists of a float 8, on the stem of which there is a movable contact 3, and a fixed contact 2, fixed in the housing 1. When the liquid level drops, the float drops and the contacts close the control lamp circuit.
The pressure regulator 25 is included in the rear brake drive in order to prevent an increase in pressure in this circuit when the load on the rear axle of the wheels decreases. Otherwise, it is possible to block the rear wheels and their skidding. The regulator is attached with two bolts to the body bracket, and one hole in the bracket is made oval, which allows you to adjust the position of the pressure regulator.
The pressure regulator is actuated by a torsion lever 31 (see fig. 22), which is attached to the body with a clip 32 through a rubber support sleeve 33. The long arm of the lever 31 is pivotally connected through the rod 12 to the rear axle beam, and the short arm passes through the axle hole 29 and enters the cutout of the lower part of the piston 16 (see fig. 26) regulator. This shoulder transmits the oscillatory movement of the rear axle beam to the piston.
Fittings of two pipelines are screwed into the pressure regulator housing: the lower one is for supplying fluid from the main cylinder, the upper one is for supplying fluid to the wheel cylinders.
The piston 16 of the regulator at the outlet of the housing is sealed with a ring 9 located in a metal cage. This ring is pressed by spring 10. The upper end of the spring rests against the floating plate 11 and through it into the shoulders of the piston. The spring tends to press the piston until it stops in the plug 14. The bushing 13 is loosely put on the piston head. It limits the upward movement of the seal 12 towards the piston head.