AUTOMATIC TRANSMISSION 722

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WEL COME TO THE PRESENTATION OF :

WEL COME TO THE PRESENTATION OF AUTOMATIC TRANSMISSION 722.9

TRANSMISSION:

TRANSMISSION Transmission means whole of the mechanism that transmits the power from the engine crankshaft to rear wheels. Transmission provides suitable variation of engine torque at the road wheels.

TYPES OF TRANSMISSION:

TYPES OF TRANSMISSION Mainly two types of transmission Manual transmission Automatic transmission

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AUTOMATIC TRANSMISSION An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually.

LOCATION:

LOCATION It is located after the engine. Starts from the torque converter to the gearbox output shaft.

DIVISION OF TRANSMISSION ASSEMBLY:

DIVISION OF TRANSMISSION ASSEMBLY 1) Mechanical assembly Planetary gears set Parking locks 2) Hydraulic assembly ATF automatic transmission fluid Oil supply Torque converter Electro hydraulic control unit 3) Electronic assembly Control unit Sensor Actuator Control & display elements

MECHANICAL ASSYMBLES:

MECHANICAL ASSYMBLES

PowerPoint Presentation:

RAVIGNEAUX GEAR SET: 1. Short planet gear 2. Long planet gear 3. Sun gear 4. Planet carrier

RAVIGNEAUX PLANETARY GEAR SET, FUNCTION:

RAVIGNEAUX PLANETARY GEAR SET, FUNCTION The elements of the Ravigneaux gear set used are driven or stalled alternately via the shift elements of multi-disk clutch and multi-disk brake. If 2 components of the Ravigneaux gear set are rigidly connected to each other, the planetary set is blocked and rotates as a closed unit.

PowerPoint Presentation:

ADVANTAGES OF A RAVIGNEAUX GEAR SET : Shifting ability under load Several ratios can be produced Constant meshing of the gears High efficiency Compact design Combined 2 single planetary gear systems in one unit

GEAR ASSEMBLY:

GEAR ASSEMBLY Planetary Gear Set

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REDUCTION

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OVERDRIVE

:

REVERSE

PARKING BRAKE:

PARKING BRAKE Secure the vehicle mechanically to prevent it from rolling in addition to the parking brake

PowerPoint Presentation:

LOCATION

HYDRAULIC ASSYMBLES:

HYDRAULIC ASSYMBLES

MAJOR COMPONENTS OF TORQUE CONVERTER:

MAJOR COMPONENTS OF TORQUE CONVERTER The Pump Impeller. The Turbine Runner and The Stator.

TORQUE CONVERTER-FUNCTION :

TORQUE CONVERTER-FUNCTION

PowerPoint Presentation:

Due to the effect of centrifugal force, the blades of the impeller (P) pump the oil outwards to the turbine wheel (T), causing it to rotate. The turbine wheel blades direct the oil onto the blades of the stator , which in turn push the oil back to the impeller (P). The diversion at the stator (L), which is supported against the transmission housing via the freewheel, produces an increase in torque. WORKING

PowerPoint Presentation:

To produce necessary oil pressure for the hydraulic components OIL PUMP (CRESCENT PUMP)

WHAT IS THE ELECTRO HYDRAULIC :

WHAT IS THE ELECTRO HYDRAULIC Mounted between the torque converter and the planetary gear set. It draws transmission fluid from a sump and pressurizes it, which is needed for transmission components to operate. The input for the pump is connected to the torque converter housing, which in turn is bolted to the engine's flywheel, so the pump provides pressure whenever the engine is running and there is enough transmission fluid. Early automatic transmissions also had a rear pump, allowing push-starting.

ELECTRO HYDRAULIC CONTROL UNIT IN AUTOMATIC TRANSMISSION:

ELECTRO HYDRAULIC CONTROL UNIT IN AUTOMATIC TRANSMISSION The electro hydraulic control system for the transmission and transfer consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controlling units including solenoid valves. The system controls the automatic transmission operation, including gear shifting, lockup clutch operation, line pressure, automatic control pattern selection (Base and Power), and gear-shift timing. It also controls the operation of the transfer clutch. The TCM determines vehicle operating conditions from various input signals and controls a total of eight solenoids (shift solenoids1 and 2, low clutch timing solenoid, 2-4 brake timing solenoid, line pressure duty solenoid, lockup duty solenoid, transfer duty solenoid and 2-4 brake duty solenoid) by sending appropriate signals to them.

COMPLETE ELECTRO HYDRAULIC CONTROL UNIT:

COMPLETE ELECTRO HYDRAULIC CONTROL UNIT

VALVE BODY:

VALVE BODY The valve body consists of an upper valve body, and a lower valve body. The valve body resembles a labyrinth, containing many passages through which the transaxle fluid flows. Many valves are built into these passages, they contained therein control fluid pressure and switch fluid from one passage to another. Normally, the valve body contains the Primary regulator valve Manual valve Shift valves (1-2, 2-3, 3-4) Solenoid valves (No. 1, No. 2) Throttle valve The number of valves depends on the model and some have valves other than those above

VALVE BODY FUNCTIONS:

VALVE BODY FUNCTIONS Regulating Main Pressure Controlling fluid flow to shift elements for Up shifts and Downshifts. Providing for manual operation by driver via manual valve. Torque Converter Control Distribution of lubrication

VALVE HOUSING:

VALVE HOUSING

VALVE BODY :

VALVE BODY

SHIFT VALVE HOUSING COMPONENTS:

SHIFT VALVE HOUSING COMPONENTS SHIFT VALVE PRESSURE REGULATING VALVE REGULATOR VALVE

SHIFT VALVE:

SHIFT VALVE REST POSITION:- Inlet valve P is closed Outlet valve A & Drain valve 0 is connected

PowerPoint Presentation:

OPERATING POSITION:- Control pressure X moves the valve Drain valve 0 is closed & there is a connection between P & A SHIFT VALVE

PRESSURE REGULATING VALVE:

PRESSURE REGULATING VALVE

PRESSURE REGULATING VALVE:

PRESSURE REGULATING VALVE WORKING :- When the pressure exceeds the preset value, the inlet valve is slightly open & there is a flow of oil from inlet valve to the inlet of lubrication pressure regulation valve

WORKING:

WORKING

REGULATOR VALVE:

REGULATOR VALVE A regulator valves converts a variable control pressure into a coupling pressure, which is like wise variable. It acts as an amplifier, i.e. both the pressure emitted from the regulator valve and flow rate are significantly higher

REGULATOR VALVE:

REGULATOR VALVE

PowerPoint Presentation:

EXTERNAL RINGS INTERNAL RING INTERNAL CARRIER RETURN SPRING PRESSURE PISTON EXTERNAL CARRIER MULTI PLATE BRAKE

PowerPoint Presentation:

WORKING OF MULTI PLATE BRAKE

PowerPoint Presentation:

MULTI PLATE CLUTCH

PowerPoint Presentation:

WORKING OF MULTI PLATE CLUTCH

A T F LUBRICATION:

A T F LUBRICATION Dirt filter→ oil pump→ electro hydraulic control unit→ shift component→ torque converter→ oil cooler→ lubrication parts→ and drops back to the sump.

A T F LUBRICATION:

A T F LUBRICATION

ELECTRICAL ASSYMBLES:

ELECTRICAL ASSYMBLES

PARTS OF ELECTRO CONTROL UNIT:

PARTS OF ELECTRO CONTROL UNIT 11 Plug connection 21a Supporting body 31 Float 1 32 Float 2 Y3/8n1 Turbine wheel rpm sensor Y3/8n2 Internal transmission speed rpm sensor Y3/8n3 Output shaft rpm sensor Y3/8n4 Fully integrated transmission control unit Y3/8y1 Working pressure control solenoid valve Y3/8y5 Multidisc brake control solenoid valve B1 Y3/8y2 Clutch control solenoide valva K1 Y3/8y6 Multidisk brake control solenoid valve B2 Y3/8y3 Clutch control solenoid valve K2 Y3/8y7 Multi disk brake control solenoid valve B3 Y3/8y4 Clutch control solenoid valveK3 Y3/8y8 Torque converter /8s1 Selection range sensor

INFORMATION FROM OTHER CONTROL UNITS:

INFORMATION FROM OTHER CONTROL UNITS

SOLENOID VALVE:

SOLENOID VALVE

FUNCTION OF SOLENOID VALVE:

FUNCTION OF SOLENOID VALVE The working pressure control solenoid valve (VGS) assigns a proportional pressure to the current which is controlled by the fully integrated transmission control (VGS) control unit.

SOLENOID VALVES:

SOLENOID VALVES Solenoid valves are located on the electric set in the ELECETROHYDRAULIC CONTROL UNIT. Solenoid valves are of two types: SWITCHING SOLENOID VALVES SOLENOID CONTROL VALVES

SWITCHING SOLENOID VALVE:

SWITCHING SOLENOID VALVE It is used for switching , regulating & adjusting the oil pressure required for the transmission system P= INLET A=OUTLET 0=DRAIN

SWITCHING SOLENOID VALVE AT REST POSITION:

SWITCHING SOLENOID VALVE AT REST POSITION

SWTCHING SOLENOID VALVE IN OPERATING POSITION:

SWTCHING SOLENOID VALVE IN OPERATING POSITION

SOLENOID CONTROL VALVE:

SOLENOID CONTROL VALVE Solenoid control valve is used to modulate continuously adjustable pressure. There are two types of solenoid control valve:- RISING CHARACTERISTIC FALLING CHARACTERISTIC

RISING CHARACTERISTIC:

RISING CHARACTERISTIC WORKING:- Pressure rises when the valve is actuated. Depressurized at limp home mode

FALLING CHARACTERISTIC:

FALLING CHARACTERISTIC WORKING :- Pressure decreases when the valve is actuated. Pressure is maximum at limp home mode.

PowerPoint Presentation:

FLOAT

OVERRUNNING CLUTCH :

OVERRUNNING CLUTCH Overrunning clutch permits the stator to rotate freely in one direction & lock up in opposite direction.

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ATF COOLING SYSTEM

TRANSMISSION OIL COOLER:

TRANSMISSION OIL COOLER The transmission oil cooler is located in the front center of the radiator.

COOLING CIRCUIT:

COOLING CIRCUIT

FUNCTON OF A T F:

FUNCTON OF A T F Lubricates mechanical components (planetary gears, bearings etc.). Removes heat and transfers heat to transmission cooling system. (Heat Exchanger). Provides a transfer of kinetic energy in the torque converter. Allows hydraulic operation of mechanical components (clutches, brakes) via control of the valve body.

WORKING PRINCIPLE OF A T F:

WORKING PRINCIPLE OF A T F At a transmission oil temperature <90 °C the transmission oil flows from transmission oil heat exchanger via a bypass and return to transmission. As the transmission oil temperature increases the expansion element expands and presses the thermostat piston against the spring. As a result the return from the transmission oil cooler to the transmission is opened at a transmission oil temperature >90 °C and the bypass is closed off.

POWER FLOW OF 722.9 AUTOMATIC TRANSMISSION:

POWER FLOW OF 722.9 AUTOMATIC TRANSMISSION

PowerPoint Presentation:

Power Flow in 1 st Gear The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake B2 (B2) Multi-disk brake B3 (B3) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in 2 nd Gear The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake B2 (B2) Multi-disk brake B1 (B1) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in 3 rd Gear The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake B2 (B2) Multi-disk clutch K1 (K1) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in 4 th Gear The following multi-disk brakes and multi-disk clutches are engaged : Multi-disk brake B2 (B2) Multi-disk clutch K1 (K1) Multi-disk clutch K2 (K2)

PowerPoint Presentation:

Power Flow in 5 th Gear The following multi-disk brakes and multi-disk clutches are engaged : Multi-disk clutch K1 (K1) Multi-disk clutch K2 (K2) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in 6 th Gear The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk clutch K2 (K2) Multi-disk brake B1 (B1) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in 7 th Gear The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake B3 (B3) Multi-disk clutch K2 (K2) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in Reverse Gear ‘C’ Mode The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake B3 (B3) Multi-disk brake BR (BR) Multi-disk clutch K3 (K3)

PowerPoint Presentation:

Power Flow in Reverse Gear ‘S’ Mode The following multi-disk brakes and multi-disk clutches are engaged: Multi-disk brake BR (BR) Multi-disk brake B1 (B1) Multi-disk clutch K3 (K3)

GEAR RATIOS:

GEAR RATIOS

CALCULATION OF GEAR RATIOS:

CALCULATION OF GEAR RATIOS The gear ratio of planetary gear set is calculated by number of teeth of carrier ,ring, sun gear, since there is no teeth on planetary carrier and no of teeth on planet gears are not related to gear ratio of planetary gear set. Simply count the number of teeth's on sun and the ring gears and add these. Z c = Zr+Zs Where, Z c = No. of carrier teeth Z r = No. of ring gear teeth Z s = No. of sun gear teeth

Gear Ratio for 722.9:

Gear Ratio for 722.9 Gear Gear Ratio 1 4.38:1 2 2.86:1 3 1.92:1 4 1.37:1 5 1:1 6 0.82:1 7 0.73:1 R ‘C’ Mode -3.42:1 R ‘S’ Mode -2.23:1

THANK YOU:

THANK YOU PRESENTED BY: PRAVEEN K H MOHD ISHAQ YOGESHA B K VIJAY KUMAR MANISH SINGH MUKUNDA SAMANTA

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