TRANSAXLE
TRANSAXLE : Cross-Sectional View
TRANSAXLE : Operation Status
TRANSAXLE : Transaxle Mechanism
TORQUE CONVERTER (WITH LOCK-UP FUNCTION)
In the same way as a conventional A/T, the torque converter is a system that increases the engine torque and transmits the torque to the transaxle. A symmetrical 3-element, 1-stage, 2-phase type is used here.
OIL PUMP
Utilizes a vane-type oil pump that is driven by the engine through the oil pump drive chain in order to increase efficiency of pump discharge volume in low-speed zone and optimize pump discharge volume in high-speed zone. Discharged oil from oil pump is transmitted to control valve. It is used as the oil of primary and secondary pulley operation, the oil of clutch operation, and the lubricant for each part.
PLANETARY GEAR
Operation of Planetary gear
BELT & PULLEY
It is composed of a pair of pulleys (the groove width is changed freely in the axial direction) and the steel belt (the steel plates are placed continuously and the belt is guided with the multilayer steel rings on both sides).
The groove width changes according to wrapping radius of steel belt and pulley from low status to overdrive status continuously with non-step. It is controlled with the oil pressures of primary pulley and secondary pulley.
Steel Belt
It is composed of multiple steel plates A and two steel rings B stacked to a several number. The feature of this steel belt transmits power with compression of the steel plate in contrast with transmission of power in pulling with a rubber belt. Friction force is required with the pulley slope to transmit power from the steel plate. The force is generated with the following mechanism: Oil pressure applies to the secondary pulley to nip the plate. ⇒The plate is pushed and extended outward. ⇒The steel ring shows withstands.
⇒Pulling force is generated on the steel ring. ⇒The plate of the primary pulley is nipped between the pulley. ⇒Friction force is generated between the steel belt and the pulley.
Therefore, responsibilities are divided by the steel plate that transmits the power with compression and the steel ring that maintains necessary friction force. In this way, the tension of the steel ring is distributed on the entire surface and stress variation is limited, resulting in good durability.
Pulley
The primary pulley (input shaft side) and the secondary pulley (output shaft side) have the shaft with slope (fixed cone surface), movable sheave (movable cone surface that can move in the axial direction) and oil pressure chamber at the back of the movable sheave.
The movable sheave slides on the shaft to change the groove width of the pulley. Input signals of engine load (accelerator pedal opening), primary pulley speed and secondary pulley speed change the operation pressures of the primary pulley and the secondary pulley, and controls the pulley groove width.
FINAL DRIVE AND DIFFERENTIAL
The deceleration gears are composed of 2 stages: primary deceleration (output gear, idler gear pair) and secondary deceleration (reduction gear, final gear pair). All of these gears are helical gears.
The lubrication oil is the same as the CVT fluid which lubricates the entire transaxle
TRANSAXLE : Oil Pressure System
Oil pressure required for operation of the transaxle transmission mechanism is generated by oil pump, oil pressure control valve, solenoid valve, etc.
TRANSAXLE : Component Description
Part name | Function |
Torque converter | Increases engine torque and transmits it to the transaxle. |
Oil pump | Utilizes a vane-type oil pump that is driven by the engine through the oil pump drive chain in order to increase efficiency of pump discharge volume in low-speed zone and optimize pump discharge volume in high-speed zone. Discharged oil from oil pump is transmitted to control valve. It is used as the oil of primary and secondary pulley operation, the oil of clutch operation, and the lubricant for each part. |
Forward clutch | The forward clutch is wet and multiple plate type clutch that consists of clutch drum, piston, drive plate, and driven plate. It is a clutch to move the vehicle forward by activating piston hydraulically, engaging plates, and directly connecting sun gear and input shaft. |
Reverse brake | The reverse brake is a wet multiple-plate type brake that consists of transaxle case, piston, drive plate, and driven plate. It is a brake to move the vehicle in reverse by activating piston hydraulically, engaging plates, and fixing planetary gear. |
Internal gear | The internal gear is directly connected to forward clutch drum. It is a gear that moves the outer edge of pinion planet of planet carrier. It transmits power to move the vehicle in reverse when the planet carrier is fixed. |
Planet carrier | Composed of a carrier, pinion planet, and pinion shaft. This gear fixes and releases the planet carrier in order to switch between forward and reverse driving. |
Sun gear | Sun gear is a set part with planet carrier and internal gear. It transmits transmitted force to primary fixed sheave. It rotates in forward or reverse direction according to activation of either forward clutch or reverse brake. |
Input shaft | The input shaft is directly connected to forward clutch drum and
transmits traction force from torque converter.
In shaft center, there are holes for hydraulic distribution to primary pulley and hydraulic distribution for lockup ON/OFF. |
Primary pulley | It is composed of a pair of pulleys (the groove width is changed freely in the axial direction) and the steel belt. The groove width changes according to wrapping radius of steel belt and pulley from low status to overdrive status continuously with non-step. It is controlled with the oil pressures of primary pulley and secondary pulley. |
Secondary pulley | |
Steel belt | |
Manual shaft | When the manual shaft is in the P position, the parking rod that is linked to the manual shaft rotates the parking pole. When the parking pole rotates, it engages with the parking gear, fixing the parking gear. As a result, the secondary pulley that is integrated with the parking gear is fixed. |
Parking rod | |
Parking pawl | |
Parking gear | |
Output gear | The deceleration gears are composed of 2 stages: primary deceleration (output gear, idler gear pair) and secondary deceleration (reduction gear, final gear pair). All of these gears are helical gears. |
Idler gear | |
Reduction gear | |
Differential | |
Torque converter regulator valve | Adjusts the feed pressure to the torque converter to the optimum pressure corresponding to the driving condition. |
Pressure regulator valv | Adjusts the discharge pressure from the oil pump to the optimum pressure (line pressure) corresponding to the driving condition. |
Torque converter clutch control valve | Adjusts the torque converter engage and disengage pressures. |
Manual valve | Distributes the clutch operation pressure to each circuit according to the selector lever position. |
Secondary reducing valve | Reduces line pressure and adjusts secondary pressure. |
Primary reducing valve | Reduces line pressure and adjusts primary pressure. |
Pilot valve A | Reduces line pressure and adjusts pilot pressure to the solenoid
valves listed below.
|
Pilot valve B | Reduces pilot pressure and adjusts pilot pressure to the torque converter clutch solenoid valve. |
FLUID COOLER & FLUID WARMER SYSTEM
FLUID COOLER & FLUID WARMER SYSTEM : System Description
CVT FLUID COOLER SCHEMATIC
COMPONENT DESCRIPTION
CVT Oil Warmer
CVT oil warmer is provided with two circuits for CVT and engine coolant respectively so that warmed engine coolant warms CVT quickly. This helps shorten CVT warming up time, improving fuel economy.
Heater Thermostat
CVT Fluid Cooler (Water Cooling Type)
SHIFT LOCK SYSTEM
SHIFT LOCK SYSTEM : System Description
SHIFT LOCK OPERATION AT P POSITION
When brake pedal is not depressed (no selector operation allowed) When the brake pedal is not depressed with the ignition switch ON, the shift lock solenoid A is OFF (not energized) and the solenoid rod B is extended with spring.
The connecting lock lever C is located at the position shown in the figure when the solenoid rod is extended. It prevents the movement of the detent rod D. The selector lever cannot be shifted from the “P” position for this reason.
When brake pedal is depressed (selector lever operation allowed) The shift lock solenoid A is turned ON (energized) when the brake pedal is depressed with the ignition switch ON. The solenoid rod B is compressed with the electromagnetic force. The connecting lock lever C rotates when the solenoid rod is compressed. Therefore, the detent rod D can be moved. The selector lever can be shifted to other positions for this reason.
FORCIBLE RELEASE OF SHIFT LOCK
KEY LOCK SYSTEM
KEY LOCK SYSTEM : System Description
KEY LOCK MECHANISM
The key is not set to LOCK when the selector lever is not selected to P position. This prevents the key from being removed from the key cylinder.
Key lock status
The slider B in the key cylinder A is moved to the left side of the figure when the selector lever is in any position other than “P” position.
The rotator D that rotates together with the key C cannot be rotated for this reason. The key cannot be removed from the key cylinder because it cannot be turned to LOCK .
Key unlock status
The slider B in the key cylinder A is moved to the right side of the figure when the selector lever is in “P” position and the finger is removed from the selector button. The rotator C can be rotated for this reason. The key D can be removed from the key cylinder because it can be turned to LOCK E.
Power seat switch
Exploded View
Seat cushion outer finisher
Power seat switch
Removal and Installation
REMOVAL
NOTE:
LH shown, RH similar.
Using a suitable tool release clips and remove seat cushion
outer finisher (1).
: Clip
Disconnect harness connector from power seat switch.
...
Primary speed sensor
Exploded View
Transaxle assembly
O-ring
Primary speed sensor
: Always replace after every
disassembly.
: N·m (kg-m, in-lb)
: Apply CVT fluid
Removal and Installation
REMOVAL
Remove the engine undercover. Refer to EXT-37, "ENGINE UNDER COVER
: Removal and Ins ...
P0506 ISC system
Description
The ECM controls the engine idle speed to a specified level through the fine
adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator.
The operating of the throttle valve is
varied to allow for optimum control of the engine ...