Oil Pressure System
WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
Oil pressure required for operation of the transmission mechanism is generated by oil pump, oil pressure control valve, solenoid valve, etc.
The components are as follows:
- Torque Converter - It is composed of the cover converter, turbine assembly, stator, pump impeller assembly and etc. It increases the engine torque and transmits the power to the transmission.
- Oil Pump - Through the oil pump drive chain, it uses the vane oil pump driven by the engine. It generates necessary oil pressure to circulate fluid and to operate the clutch and brake.
- Counter Gear Set - The power from the torque converter is transmitted to the primary pulley through the counter drive gear and the counter driven gear.
- Belt and Pulley (Continuously Variable Transmission) - It is composed of the primary pulley, secondary pulley, steel belt, etc. and the mechanism performs shifting, changes the gear ratio and transmits the power with oil pressure from the control valve.
- Auxiliary Gearbox (Stepped Transmission) - It is composed of the planetary gear, multi-disc clutch, multi-disc brake, etc. and the mechanism performs shifting (1-2 gear shifting and reverse) with oil pressure from the control valve.
- Reduction Gear Set - Conveys power from the transmission mechanism to the reduction gear and the final gear.
- Parking Mechanism - When the shift lever is changed to P position, the mechanism fixes the parking gear (integrated with the reduction gear) and fixes the output shaft.
- Valves
- Control Valve: Controls oil pressure from the oil pump to the pressure suitable for the line pressure control system, shift control system, lock-up control system and lubrication system.
- Pressure Regulator Valve: Adjusts the discharge pressure from the oil pump to the optimum pressure (line pressure) corresponding to the driving condition.
- Torque Converter Regulator Valve: Adjusts the feed pressure to the torque converter to the optimum pressure corresponding to the driving condition.
- Pilot Valve: Adjusts line pressure and produces a constant pressure (pilot pressure) necessary for activating each solenoid valve.
- Manual Valve: Distributes the clutch and brake operation pressures (pilot pressure) corresponding to each shift position.
- High Clutch/Reverse Brake Switching Valve: Switches the circuit for the high clutch and the reverse brake.
- Torque Converter Clutch Control Valve: It is operated with the torque converter clutch solenoid valve and it adjusts the tightening pressure and non-tightening pressure of the torque converter clutch piston of the torque converter.
- Primary Pressure Control Valve: It is operated with the primary pressure solenoid valve and adjusts the feed pressure to the primary pulley.
- Primary Pressure Solenoid Valve: The primary pressure solenoid valve controls the primary pressure control valve.
- Low Brake Solenoid Valve: The low brake solenoid valve adjusts the tightening pressure of the low brake.
- High Clutch and Reverse Brake Solenoid Valve: The high clutch & reverse brake solenoid valve adjusts the tightening pressure of the high clutch and reverse brake.
- Torque Converter Clutch Solenoid Valve: The torque converter clutch solenoid valve controls the torque converter clutch control valve.
- Line Pressure Solenoid Valve: The line pressure solenoid valve controls the pressure regulator valve.
- Electric Oil Pump (for idling stop applied model): TCM runs electric oil pump during idling stop operation. Oil pressure required for restart of the engine is generated by electric oil pump instead of the mechanical oil pump.
- Electric Oil Pump Relay (for idling stop applied model): TCM runs electric oil pump relay so that pump gets ready to start. When the ignition switch is OFF, electric oil pump relay is OFF.