BÀI GIẢNG: HỆ THỐNG PHANH pdf

Brake Booster General & Construction 1.General/ 2.Construction 13 Check valveVacuum Brake master cylinder 10 Body seal2 Push rod4 Booster body 6 Diaphragm spring 11 Variable pressure cha

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Diagnosis Technician >> Brake >> Brake System

KHOA CƠ KHÍ ĐỘNG LỰC

HỆ THỐNG PHANH

BRAKE SYSTEM

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YÊU CẦU

- Lực phanh lớn và tác dụng nhanh (nhạy), có khả năng dừng xe gấp với thời gian và quãng đường phanh ngắn nhất

- Hoạt động êm dịu, tính ổn định chuyển động của xe khi phanh cao

- Lực phanh phân phối ở các bánh xe theo qui luật phân bố tải

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Br ak

e S yste m

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Master Cylinder General & Construction

(1/3)

1.General/2.Construction

Minimum

(5) Rubber piston cups

(7) Fluid level sensor

(6) Reservoir tank

(1) No.1 piston(2) No.1 return spring

(3) No.2 piston(4) No.2 return spring

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F1 A = F2 B  F2= F1

F1: Pedal force

F2: Push rod output force

A1: Distance from center of brake pedal to fulcrum

B: Distance from push rod to fulcrumOperating force:

Push rodb

= a = b  b = a 

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Master Cylinder Operation

to Rear sideNo.2 piston

Compensating portInlet portNo.1 piston

No.1 piston cupStopper bolt

No.2 piston cup

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(2/4)

Brake pedal depressed (1)

to Front side to Rear side

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Brake pedal released (1)

Inlet port

Piston cup

Compensating portOrifices

Brake pedal released (2)

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(4/4)

No.1 pistonContactNo.2 piston

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No.1 pistonPiston contacts wall

No.2 piston

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Brake Booster General & Construction

1.General/

2.Construction

(13) Check valveVacuum

Brake master cylinder

(10) Body seal(2) Push rod(4) Booster body

(6) Diaphragm spring

(11) Variable pressure chamber

Air

(1) Valve operating rod

(9) Air cleaner(10) Body seal

HINT: Tandem brake booster

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Brake Booster Operation

Booster pistonControl valve

Diaphragm spring

Vacuum valve (opened)Piston

1.Brakes not applied

Valve operating rod

Variable pressure chamber

Constant pressure chamber

Air valve (closed)

Control valveControl valve spring

Valve operating

Valve bodyPassage A

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Air valve (opened)

Control valve spring

Air cleaner element

Control valveControl valve spring

Valve operating rod

Control valvePassage A Vacuum valve (closed)

Passage BAir valve

(closed)

Air

Passage B

Booster push rod

Diaphragm spring

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Booster pistonControl valve

Piston

3.Holding state

Valve operating rod

Control valve

Diaphragm spring

Vacuum valve

Air valve (closed)

Stopped

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Valve operating rod

Control valve

Diaphragm spring

Vacuum valve

Air valve (opened)

Booster push rod

Air

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Valve body

Valve operating rod

Valve stopper keyReaction disc

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Brake Booster Reaction mechanism

80 N(to Valve body)

Booster push rod

100 N

1cm2 (20N)

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Brake Booster Gap Adjustment of Push Rod

Choke applied

SST

Thickness gauge

BRAKE BOOSTER ADJUSTMENT

•Thickness Gauge(0.2mm or 0.008inch) and Special Service Tool(SST 09737- 00010)are required to check and adjust the push rod length.

• See Repair Manual for details.

Accessory toolSST

STT 09737-00010

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Brake Booster Function Check

(1/1)

Airtightness function cheek

to Intake manifold

Atmospheric pressure

Operating cheek to Intake manifold

Vacuum

to Intake manifoldAtmospheric pressure

Vacuum tightness function cheek

Vacuum

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to Intake manifold

Vacuum

1.Airtightness function check

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(1/1)

to Intake manifold

Vacuum

2.Operation check

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to Intake manifold

Vacuum

3.Load airtightness function

check

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Proportioning Valve General & Construction

(1/1)

(a) Desired curve-line

of braking force Rear wheel

(3) Valve seal Front

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Proportioning Valve Operation

from Master cylinder

Cylinder cup

Split point

Master cylinder pressure

Master cylinder hydraulic pressure

Spring

Master cylinder hydraulic pressure Force by the difference in the pressure reception surface area

to Rear wheel cylinders

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Spring

reception surface area

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Spring

reception surface area

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Proportioning Valve Types of P Valve

Spring

Front Front

Piston Cylinder cup

Dual P valve P & Bypass valve

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Proportioning Valve Types of P Valve

Control the effectiveness

3 Load Sensing Proportioning

Piston LSPV

Valve seal

Valve body Extends

Vehicle unloaded

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Foot Brake Disc Brake

During operation

(5) Fluid (1) Disc brake caliper

(3) Disc brake rotor (2) Disc brake pad

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Disc brake caliper

Piston seal returns piston by amount of its deformation.

Clearance

deformation Piston

Brakes released

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After pad wear

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5.Pad wear indicator

Direction of disc brake rotor rotation

Anti-squeal shim Disc brake pad

Pad wear indicator

Backing plate

Before pad wear After pad wear

Inner pad

Pad wear indicator

to ECU

Clip

Pad wear indicator

Before pad wear After pad wear

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(5/6)

6.Types of disc brake caliper

Disc brake caliper

Torque plate

Disc brake rotor

Hydraulic pressure

Fixed caliper type Floating caliper type

Inner pad Pin

Torque plate

Disc brake caliper

Steering knuckle (Fixed)

Bolt

PD type

Torque plate

Disc brake caliper Bolt

Torque plate

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7.Types of disc brake

rotor

Ventilated type with Drum type Solid type

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Foot Brake Drum Brake

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3.Leading shoe and

trailing shoe

Self-energing function

Wheel cylinder Direction of drum

rotation

Leading shoe

Trailing shoe

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Duo-servo type Uni-servo type

Fixed wheel cylinder

Adjusting cylinder

Forward Backward

Leading shoe

Trailing shoe

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Duo-servo type Uni-servo type

Adjusting cylinder

Forward Backward

Leading shoe

Trailing shoe

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Adjust leverGap is larger

AdjustorBrake shoe

The adjust lever turns the adjustor

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(4/4)Contract

Expand

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Parking Brake Types of Parking Brake Lever

Release lever

LockRelease

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Parking Brake Types of Parking Brake Body

(1/1)

Brake shoe

Drum brake type

Parking brake cable

Disc brake pad

Disc brake type

Devoted parking brake type Center brake type

Parking brake cable

Shoe lever

Brake shoeDisc brake pad

Brake shoe

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Brake shoe

Drum brake type

Parking brake cable

Disc brake pad

Disc brake type

Parking brake cable

Shoe lever

Brake shoe

1.Foot brake sharing type

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(1/1)

Brake shoe

Drum brake type

Parking brake cable

Disc brake pad

Disc brake type

Parking brake cable

Shoe lever

Brake shoe

2.Devoted parking

brake type

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Brake shoe

Drum brake type

Parking brake cable

Disc brake pad

Disc brake type

Parking brake cable

Shoe lever

Brake shoe

3.Center brake type

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Brake Booster Tandem Brake Booster

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Brake Booster Fading

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Foot Brake Brake Pedal Height Adjustment

(1/1)

Adjusting pointLock nut

Push rod

Pedal height Pedal freeplay

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Parking Brake Parking Brake Lever Travel Adjustment

Lock nut

Lever type

Adjusting nut

Lock nut

Stick type

Adjusting nut

Lock nut

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