Governor mechanism for a distributor-type fuel injection pump

In a distributor-type fuel injection pump for an internal combustion engine, including:

• a pump housing having an inner chamber charged with fuel;
• means forming a pump work chamber in communication with said inner chamber;
• a distributor plunger adjoining said pump work chamber and delivering a quantity of fuel to said engine for injection during each pressure stroke, said distributor plunger having a relief channel in communication with said pump work chamber;
• a control sleeve mounted on said distributor plunger for controlling said relief channel;
• and
• a governor mechanism controlling the axial position of said control sleeve to vary said quantity of injected fuel by changing the terminal moment of fuel delivery during each pressure stroke of said distributor plunger, said governor mechanism having a stationary governor shaft, a governor sleeve axially displaceable on said governor shaft and having an inner space adjoined by said governor shaft and in communication with said inner chamber, centrifugal weights mounted for rotation about said governor shaft and mounted to swing outwardly displacing said governor sleeve in the direction to produce expansion of said inner space, and coupling means providing operative connection between said control sleeve and said governor sleeve;
• whereby said control sleeve is displaced in the direction to increase said quantity of injected fuel in response to displacement of said governor sleeve in the direction to produce contraction of said inner space;
• the improvement therein comprising;
• first channel means for providing restricted communication between said inner chamber and said inner space;
• second channel means for providing substantially unrestricted communication between said inner chamber and said inner space;
• and
• valve means operable for permitting only said first channel means to establish said restricted communication upon displacement of said governor sleeve in the direction to produce contraction of said inner space, and for permitting at least said second channel means to establish said substantially unrestricted communication upon displacement of said governor sleeve in the direction to produce expansion of said inner space;
• said valve means comprising a valve element which is in the form of a thin, flat plate and which is disposed within said inner space in a manner to be slidingly movable axially of said governor sleeve.

In a distributor-type fuel injection pump for an internal combustion engine, including:

• a pump housing having an inner chamber charged with fuel;
• means forming a pump work chamber in communication with said inner chamber;
• a distributor plunger adjoining said pump work chamber and delivering a quantity of fuel to said engine for injection during each pressure stroke, said distributor plunger having a relief channel in communication with said pump work chamber;
• a control sleeve mounted on said distributor plunger for controlling said relief channel;
• and
• a governor mechanism controlling the axial position of said control sleeve to vary said quantity of injected fuel by changing the terminal moment of fuel delivery during each pressure stroke of said distributor plunger, said governor mechanism having a stationary governor shaft, a governor sleeve axially displaceable on said governor shaft and having an inner space adjoined by said governor shaft and in communication with said inner chamber, centrifugal weights mounted for rotation about said governor shaft and mounted to swing outwardly displacing said governor sleeve in the direction to produce expansion of said inner space, and coupling means providing operative connection between said control sleeve and said governor sleeve;
• whereby said control sleeve is displaced in the direction to increase said quantity of injected fuel in response to displacement of said governor sleeve in the direction to produce contraction of said inner space;
• the improvement therein comprising;
• first channel means for providing restricted communication between said inner chamber and said inner space;
• second channel means for providing substantially unrestricted communication between said inner chamber and said inner space;
• and
• valve means operable for permitting only said first channel means to establish said restricted communication upon displacement of said governor sleeve in the direction to produce contraction of said inner space, and for permitting at least said second channel means to establish said substantially unrestricted communication upon displacement of said governor sleeve in the direction to produce expansion of said inner space;
• said valve means comprising a valve element which has a form other than a solid circular disc having an outer diameter substantially equal to the inner diameter of said governor sleeve, said valve element being disposed within said inner space in a manner to be slidingly movable axially of said governor sleeve.