Neutral Control Valve

Neutral Control Valve

Outline
^ The neutral control valve operates in conjunction with the neutral shift valve. When down shifting, the neutral control valve controls the low clutch operation pressure to acquire the neutral condition.

Operation
^ Spring force and throttle pressure (11) are applied to the bottom end of the valve and push the valve upward. Conversely, "regulate" low clutch operation pressure (45) is applied to the top end of the valve and pushes the valve downward. "Regulate" low clutch operation pressure (45) and throttle pressure (11) maintain the balance. By this balance, low clutch operation pressure (35) is adjusted to "regulate" low clutch operation pressure (45).
^ When "regulate" low clutch operation pressure (45) is lower than throttle pressure (11), the valve moves upward and opens low clutch operation pressure oil passage (35) (See figure). This causes the low clutch operation pressure in oil passage (35) to flow into oil passage (45) and pressurizes "regulate" low clutch operation pressure (45). Pressurized "regulate" low clutch operation pressure (45) moves the valve downward and closes low clutch operation pressure (35) oil passage. This causes the "regulate" low clutch operation pressure to not pressurize.
^ When "regulate" low clutch operation pressure (45) is greater than throttle (11), the valve moves downward and opens drain port (X). This causes "regulate" low clutch operation pressure (45) to depressurize. When "regulate" low clutch operation pressure (45) is depressurized, the force to push the valve downward decreases and the valve moves upward and drain port (X) will close. This causes "regulate" low clutch operation pressure (45) to not depressurize. Thus, the "regulate" low clutch operation pressure (45) is adjusted according to the change in throttle pressure (11).