초록 ▼

A self-contained apparatus for moving the portions of a cowl covering the gas-generator portion of a turbofan jet engine includes a motor-driven pump for pumping hydraulic fluid from a reservoir mounted on the engine through a control circuit which selectively channels the fluid to actuators associa

A self-contained apparatus for moving the portions of a cowl covering the gas-generator portion of a turbofan jet engine includes a motor-driven pump for pumping hydraulic fluid from a reservoir mounted on the engine through a control circuit which selectively channels the fluid to actuators associated with each of the cowl portions to move the cowl portions to their desired positions. The hydraulic control circuit preferably includes solenoid-actuated valves associated with each of the actuators and operable to selectively permit flow of fluid into and out of the actuators as is desired to open and close the cowl portions. Another solenoid valve is provided to control passage of the fluid from the actuators back to the reservoir during the closing of the cowl portions. The speed of closure of the cowl portions is regulated by one-way flow restrictors in the outlet ports of the actuators that control the rate of flow of fluid out of the actuator. A manual drive is provided for the pump and is operable to permit actuation of the cowl moving apparatus during periods of power loss or motor failure.

대표청구항 ▼

In an aircraft having a jet engine, said engine having an annular cowl covering at least a portion of said engine, said cowl being longitudinally bifurcated to form first and second cowl portions, each of said cowl portions being hingedly attached to said engine for swinging movement of each of said

In an aircraft having a jet engine, said engine having an annular cowl covering at least a portion of said engine, said cowl being longitudinally bifurcated to form first and second cowl portions, each of said cowl portions being hingedly attached to said engine for swinging movement of each of said cowl portions between a first position in which said cowl portions are joined together and a second position in which said cowl portions are spaced from said engine to expose said portion of said engine, an apparatus for moving said cowl portions between their respective first and second positions comprising: a first linear hydraulic actuator associated with said engine and said first cowl portion and operable to move said first cowl portion from its first position to its second position; a second linear hydraulic actuator associated with said engine and said second cowl portion and operable to move said second cowl portion from its first position to its second position; hydraulic fluid reservoir means mounted on said engine for supplying hydraulic fluid to said actuators; hydraulic control means associated with said hydraulic fluid reservoir means and said linear hydraulic actuators and selectively operable to direct fluid from said reservoir means to said actuators, said hydraulic control means including first valve means associated with said first linear hydraulic actuator, said first valve means selectively operable in a first mode to pass hydraulic fluid from said reservoir means to said first actuator and in a second mode to pass hydraulic fluid from said first actuator to said reservoir means, second valve means associated with said second linear hydraulic actuator, said second valve means being selectively operable in a first mode to pass fluid from said reservoir means to said second actuator and operable in a second mode to pass fluid from said second actuator to said reservoir means, third valve means associated with said first and second linear hydraulic actuators and said reservoir means and selectively operable in a first mode to block the passage of hydraulic fluid from said actuators to said reservoir means and operable in the second mode to pass fluid from said actuators to said reservoir means; and hydraulic pump means mounted on said engine, said pump means having a suction and an exhaust, said suction being in fluid communication with said reservoir means and said exhaust being in fluid communication with said hydraulic control means.