The ATF pump is driven through splines on the right end of the torque converter, which is connected to the engine. Fluid passes through the regulator valve to maintain rated pressure through the main level housing to the manual control valve, which directs pressure to each clutch.
S4NA
ATF Pump (S4NA)
The ATF gear pump of external engagement consists of a housing, combined with the main level housing, a driving gear, a driven gear and a pump shaft. The ATF pump is installed on the torque converter housing, the pump is driven by the torque converter pump (directly connected to the engine) through the drive gear, which is connected to the shaft by splines. The gears are located in the housing, the input and output lines, and the torque converter line are also located in the housing.
Control valve
The control valve regulates the hydraulic pressure depending on the vehicle speed. The control valve maintains high pressure at high vehicle speed and low pressure at low vehicle speed, the pressure generated by the control valve acts on the gear shift valve and is one of the two causes of automatic speed change. The control valve gear, being in engagement with the driven gear of the main gear, rotates the valve shaft, regulating it with the help of centrifugal force. The control valve receives the line pressure. The generation of control pressure, regulates the line pressure. This pressure is regulated by the balance of centrifugal forces using the first, second and third weights centered around the axis of rotation. The force arises as a result of the difference in the diameters of the control valve and the number of revolutions, depending on the vehicle speed. The control pressure increases with increasing vehicle speed.
Regulator valve
The regulator valve maintains constant hydraulic pressure sent from the ATF pump to the hydraulic control system, while at the same time transferring fluid to the lubrication system and torque converter.
The fluid passes through lines B and B*. The fluid entering line B then passes through the opening of valve A, pushing the regulator valve to the right. In accordance with the amount of hydraulic pressure in line B, the position of the valve changes, and thus the amount of fluid passing through lines B* and D changes. This process continues, maintaining the pressure of the line.
Note: When the term "right" or "left" is used, it refers to the direction as shown in the figure below.
(With the engine off.)
Reactor hydraulic pressure control
The increase of hydraulic pressure in accordance with the moment is carried out by means of the regulator valve, using the reaction moment of the reactor. The shaft of the reactor enters the splines of the reactor and its end contacts the tip of the regulator spring. When the car accelerates or moves uphill(torque converter range), the reaction torque acts on the reactor shaft, and the lever pushes the tip of the regulator spring toward the arrow, proportional to the reaction. The spring is compressed, and the valve moves, increasing the regulated control pressure or line pressure. Line pressure is at its maximum when the reactor reaction is at its maximum.
