Throttle fail safe valve for automatic speed change gear

Abstract

Abstract PURPOSE:To make it possible to continue running a vehicle to a certain extent by raising line pressure when an opening degree control type throttle valve becomes inoperable resulting from the abnormality in the connecting system between this and an accelerator pedal. CONSTITUTION:When an abnormality has happened at the connecting part between an accelerator pedal and a plunger 4, the plunger 4 moves by a spring 47 through a throttle plate 40 until it becomes the condition as shown in the figure, a spool 2 stops at the position where a snap ring 6 is in mesh with a valve body 1, a land 4b of the plunger 4 interrupts the conduction between bores 3d, 3e. Thus, the constitution is made up by an oil passage 10, a port 1d, a bore 3d, a chamber 9, a bored 3e, and an oil passage 15, which facilitates to have a drain circuit of a throttle valve that serves for taking out part of the line pressure interrupted on its way, throttle pressure which is output from an oil passage 165 is raised up to the line pressure.

Inventors

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

Bibliographic Details