Speed change timing valve of automatic speed change gear

Abstract

Abstract PURPOSE:To provide a speed change timing valve of an automatic speed change gear, wherein the timing valve consitutes of first and second check valves, a shut-off valve and three orifices, so that when shift-up or shift-down between a second speed and a third speed is carried out, the action of a front clutch and the action of a second brake are adjusted as required. CONSTITUTION:A timing valve constitues of a first check valve 1, a second check valve 2, orifices 4,5,6, and a shut-off valve 3. When shift-up or shift-down between a second speed and a third speed is carried out in a case where the speed of the car is relatively low, the governor pressure from an oil path 158 to a chamber 19 can not rise and a spool 18 of the shut-off valve 3 remains in a position shown in the drawing, and in a case where the speed of the car is relatively high, the governor pressure can rise and the spool 18 of the shut-off valve 3 is raised to shut off a path 16. Thus an orifice is chosen through which a fluid flows, the actions of the front clutch and second brake are adjusted as required, and therefore speed change shock or idling scarcely occurs when the shit-up or shift-down by the automatic speed change gear is carried out.

Inventors

• 👤 Kazuyoshi Iwanaga
• 👤 Kazuhiko Sugano
• 👤 Kunio Otsuka

Bibliographic Details