Eaton Char-Lynn Motor – Motor Vvt Technology Effect
The VVT-i system is divided into two types depending on the installation location of the controller. One is mounted on the exhaust camshaft, called the vane VVT-i, and the Toyota PREVIA is installed. The other is installed on the intake camshaft, called the spiral groove VVT-i, Toyota Lexus 400, 430 and other high-class cars installed this paragraph. The structure of the two is somewhat different, but the effect is the same.
Vvt Motor principle, the vane type VVT-i controller consists of a casing that drives the intake camshaft and an impeller coupled to the intake camshaft, and the oil pressure from the advanced or retarded side oil passage is transmitted to the exhaust camshaft. The VVT-i controller casing is rotated to drive the intake camshaft to continuously change the intake timing. When the oil pressure is applied to the front side oil chamber rotating housing, the intake cam shaft is rotated in the advance direction; when the oil pressure is applied to the lag side oil chamber rotating housing, the intake cam shaft is rotated in the lag direction; when the Motor is stopped The camshaft hydraulic control valve is in the maximum hysteresis state.
The spiral groove type VVT-i controller includes a timing belt driven gear, an internal gear rigidly coupled to the intake camshaft, and a movable piston between the internal gear and the external gear, the piston surface having a spiral spline. The movement of the piston in the axial direction changes the phase of the inner and outer gears, resulting in a continuous change in the valve timing. When the oil pressure is applied to the left side of the piston, forcing the piston to move to the right, the intake camshaft is advanced by an angle relative to the camshaft timing pulley due to the helical spline on the piston. When the oil pressure is applied to the rock side of the piston, forcing the piston to move to the left, the intake camshaft is delayed by an angle. When the ideal valve timing is obtained, the camshaft timing hydraulic control valve closes the oil passage to balance the pressure on both sides of the piston and the piston stops moving.