Stopping device for engine supplied with fuel by fuel injection pump

A stopping device for an engine supplied with fuel by a fuel injection pump connected to a fuel tank by a fuel supply pump driven by the engine, comprising:

• a change-over valve movable between a first position and a second position, said change-over valve connecting said fuel tank with a inlet of said fuel supply pump and connecting an outlet of said fuel supply pump with an inlet of said fuel injection pump when disposed in the first position during engine operation, and said change-over valve connecting the inlet of said fuel injection pump with the inlet of said fuel supply pump and connecting the outlet of said fuel supply pump with said fuel tank when disposed in the second position during engine shutdown, said change-over valve including a valve body and a valve member rotatably fitted in a hole formed in said valve body;
• and
• an acuator for actuating said change-over valve in response to an engine shutdown operation, said actuator comprising a yoke, a shaft secured to said yoke, a pull-in coil and a holding coil concentrically arranged inside said yoke, a plunger inserted in said coils and guided by said shaft for axial movement and rotational movement, a spring urging said plunger in a direction in which the plunger is withdrawn from the coils, cam means for rotating the plunger as the plunger moves axially, means for transmitting the rotational movement of the plunger to the valve member, said cam means comprising a cam plate secured to said yoke and formed with a cam groove on its surface, a flange integral with said plunger juxtaposed against said cam plate and formed with another cam groove on its surface, and a ball inserted between said cam groove of said cam plate and the cam groove of said flange, and key switch operative to cause engine starting and shutdown operations, said key switch energizing said pull-in coil to move the change-over valve to the first position in response to an engine startup operation, said key switch energizing not only said pull-in coil but also said holding coil to hold the change-over valve in the first position during engine operation and said key switch de-energizing said pull-in coil and said holding coil to move the change-over valve to the second position in response to an engine shutdown operation.

A stopping device for an engine supplied with fuel by a fuel injection pump connected to a fuel tank via a fuel supply pump driven by the engine comprising:

• a change-over valve movable between a first position and a second position,
• said change-over valve being adapted to connect said fuel tank with an inlet of said fuel supply pump and to connect an outlet of said fuel supply pump with an inlet of said fuel injection pump when disposed in the first position,
• said change-over valve being adapted to connect the inlet of said fuel injection pump with the inlet of said fuel supply pump and to connect the outlet of said fuel supply pump with said fuel tank when disposed in the second position;
• an engine key switch adapted to be connected to an electric power source and selectively moved to a start position for engine start-up, and operation position for engine normal operation and a shutdown position for engine shutdown;
• An electromagnetic actuator including an electric winding adapted to be energized by said electric power source through said key switch to actuate said change-over valve to the first position while said key switch is moved to the start position and to the operation position and de-energized to actuate said change-over valve to the second position while said key switch is moved to the shutdown position;
• and
• means connected to said electric winding for limiting electric current flow through said electric winding while said key switch is moved to the operation position to a smaller value than while said key switch is moved to the start position.