Fuel injection and transfer pump

Claim 2

In a fuel injection pump cooperable with a rotary drive member coupled to the engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single floating lever engageable with the element; a fulcrum engageable with said lever; means operated by the drive member for oscillating the lever about its fulcrum substantially in a plane of oscillation parallel to the path of reciprocation of the pump element, said drive member operated means having a zenith position corresponding to the end of the positive displacement stroke of said pump element and a nadir position corresponding to the end of the negative displacement or return stroke of said pump element; said pump element and said drive member operated means causing said lever to impose a thrust load upon said fulcrum; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said drive member operated means from said fulcrum; means responsive to the pressure of said intake manifold for mechanically changing said ratio whereby the displacement per cycle is inversely proportional to the manifold vacuum; and a stop operative when said drive member operated means reaches its nadir relative to the lever for freeing said fulcrum during a short portion of the cycle from the load of said lever whereby said fulcrum is freely positioned in accordance with the manifold vacuum conditions.

Claim 3

In a fuel injection pump cooperable with a rotary drive member coupled to the engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciProcable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single lever engageable with the element; a fulcrum engageable with said lever; means operated by the drive member for oscillating the lever about its fulcrum; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said shaft operated means from said fulcrum means responsive to the pressure of said intake manifold for mechanically changing said ratio whereby the displacement per cycle is inversely proportional to the manifold vacuum; a demand-type transfer pump for supplying fuel to said injection pump, including a pump element spring biased to pressurize the outlet; and a lost motion connection between the lever and the pump element for said transfer pump and operative to retract it during the delivery stroke of the injection pump.

Claim 4

In a fuel injection pump cooperable with a rotary drive member coupled to the engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciProcable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single lever engageable with the element; a fulcrum engageable with said lever; means operated by the drive member for oscillating the lever about its fulcrum; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said shaft operated means from said fulcrum means responsive to the pressure of said intake manifold for mechanically changing said ratio whereby the displacement per cycle is inversely proportional to the manifold vacuum; a demand-type transfer pump for supplying fuel to said injection pump, including a pump element spring biased to pressurize the outlet; and a lost motion connection between the lever and the pump element for said transfer pump and operative to retract it during the delivery stroke of the injection pump.

Claim 5

The combination as set forth in claim 2 in which said transfer pump element is spring urged in one direction corresponding to transfer pump displacement, said transfer pump element having an abutment engaged by said lever to move said transfer pump element against the force of said spring during the time that said lever is moving in a direction to cause displacement of said metering pump.

Claim 6

In a fuel injection pump cooperable with a drive member coupled to said engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single floating lever; means forming a direct connection between one end of said lever and said pump element to cause positive displacement from said pump chamber; a cam carried by said drive member and positioned to engage the other end of said lever; a spring urging said lever to engage said cam; a fulcrum for said lever; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said cam from said fulcrum; means responsive to the pressure of said intake manifold for moving said fulcrum whereby the ratio is changed; and stop means operative when said cam means is near a nadir position for freeing said fulcrum during a portion of the cycle from the load of said lever whereby said fulcrum is freely positioned in accordance with the manifold vacuum conditions during said cycle portion.

Claim 7

In a fuel injection pump cooperable with a drive member coupled to said engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single floating lever; means forming a direct connection between one end of said lever and said pump element to cause positive displacement from said pump chamber; a cam carried by said drive member and positioned to engage the other end of said lever; a spring urging said lever to engage said cam; a fulcrum for said lever; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said cam from said fulcrum; means responsive to the pressure of said intake manifold for moving said fulcrum whereby the ratio is changed; and stop means operative when said cam means is near a nadir position for freeing said fulcrum during a portion of the cycle from the load of said lever whereby said fulcrum is freely positioned in accordance with the manifold vacuum conditions during said cycle portion.

Claim 8

The combination as set forth in claim 4 together with means for adjusting the position of said stop means for varying the displacement per cycle at idle conditions.

Claim 9

In a fuel injection pump cooperable with a drive member coupled to said engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single floating lever; means forming a direct connection between one end of said lever and said pump element to cause positive displacement from said pump chamber; a cam carried by said drive member and positioned to engage the other end of said lever; a spring urging said lever to engage said cam; a fulcrum for said lever; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said cam from said fulcrum; means responsive to the pressure of said intake manifold for moving said fulcrum whereby the ratio is changed; a fulcrum guide providing a surface along which said fulcrum tracks, said surface being substantially parallel to the lever surface engaged by said fulcrum when said cam is at its nadir position; and stop means carried by said fulcrum guide and having a height just exceeding that of said fulcrum whereby clearance between fulcrum and lever is obtained when said cam is near its said nadir position.

Claim 10

In a fuel injection pump cooperable with a drive member coupled to said engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a single floating lever; means forming a direct connection between one end of said lever and said pump element to cause positive displacement from said pump chamber; a cam carried by said drive member and positioned to engage the other end of said lever; a spring urging said lever to engage said cam; a fulcrum for said lever; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said cam from said fulcrum; means responsive to the pressure of said intake manifold for moving said fulcrum whereby the ratio is changed; a fulcrum guide providing a surface along which said fulcrum tracks, said surface being substantially parallel to the lever surface engaged by said fulcrum when said cam is at its nadir position; and stop means carried by said fulcrum guide and having a height just exceeding that of said fulcrum whereby clearance between fulcrum and lever is obtained when said cam is near its said nadir position.

Claim 11

The combination as set forth in claim 6 together with means for 10d said fulcrum guiDe and the stop means carried thereby correspondingly to adjust the displacement per cycle during idle conditions.

Claim 12

The combination as set forth in claim 6 together with means for adjusting said guide to be parallel to said lever when said eccentric is in its nadir position.

Claim 13

In a fuel injection pump cooperable with a drive member coupled to the engine and cooperable with the intake manifold: means forming a metering pump chamber; a pump element for said metering pump chamber reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of the element; a lever having an aperture; a rod extending through said aperture and loosely mounting said lever at one end, the other end of said lever being positioned to engage said pump element; spring means urging said pump element in a direction to engage said lever; an eccentric carried by the drive member and engageable with the lever at a place intermediate the rod and the said pump element; a fulcrum for the lever; means responsive to the pressure of said intake manifold for changing the position of said fulcrum whereby the displacement per cycle from said metering pump chamber is inversely proportional to the manifold vacuum; means forming a transfer chamber; a coupling between said rod and said transfer chamber to cause said rod to act as a pump element for said transfer chamber; spring means urging said rod in a direction to pressurize said transfer chamber; conduit means connecting the outlet of said transfer chamber to the inlet of said metering pump chamber; and a lost motion connection between said lever and said rod for moving said rod against the force of said spring to draw fluid into said transfer chamber during the portion of the cycle in which fluid is displaced from said metering chamber.

Claim 14

In a fuel injection pump cooperable with a drive member coupled to the engine and cooperable with the intake manifold: means forming a metering pump chamber; a pump element for said metering pump chamber reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of the element; a lever having an aperture; a rod extending through said aperture and loosely mounting said lever at one end, the other end of said lever being positioned to engage said pump element; spring means urging said pump element in a direction to engage said lever; an eccentric carried by the drive member and engageable with the lever at a place intermediate the rod and the said pump element; a fulcrum for the lever; means responsive to the pressure of said intake manifold for changing the position of said fulcrum whereby the displacement per cycle from said metering pump chamber is inversely proportional to the manifold vacuum; means forming a transfer chamber; a coupling between said rod and said transfer chamber to cause said rod to act as a pump element for said transfer chamber; spring means urging said rod in a direction to pressurize said transfer chamber; conduit means connecting the outlet of said transfer chamber to the inlet of said metering pump chamber; and a lost motion connection between said lever and said rod for moving said rod against the force of said spring to draw fluid into said transfer chamber during the portion of the cycle in which fluid is displaced from said metering chamber.

Claim 15

The combination as set forth in claim 9 together with a guide having a surface along which said fulcrum tracks, said guide surface being substantially parallel to said lever when said eccentric is at a nadir position.

Claim 16

The combination as set forth in claim 9 together with a supplemental fulcrum having a fulcrum point spaced from said guide surface by an amount slightly greater than the distance of the fulcrum point of said first named fulcrum whereby said supplemental fulcrum becomes operative at the nadir position of said eccentric and when said first fulcrum approaches the position of said supplemental fulcrum.

Claim 17

The combination as set forth in claim 10 together with a supplemental fulcrum carried by said guide having a fulcrum point spaced from said guide surface by an amount slightly greater than the distance of the fulcrum point of said first named fulcrum whereby said supplemental fulcrum becomes operative at the nadir position of said eccentric and when said first fulcrum approaches the position of said supplemental fulcrum.

Claim 18

The combination as set forth in claim 11 together with means for selectively shifting the position of said supplemental fulcrum to change the ratio of delivery per cycle at idle relative to delivery per cycle at full throttle.

Claim 19

The combination as set forth in claim 12 together with means for selectively shifting the position of said supplemental fulcrum to change the ratio of delivery per cycle at idle relative to delivery per cycle at full throttle.

Claim 20

In a fuel injection pump cooperable with the intake manifold of an internal combustion engine and cooperable with the crankshaft of said engine: a casing; a diaphragm means at one side of the casing; closure means clamping the diaphragm means in place, and providing a transfer chamber closed by said diaphragm means and a metering chamber closed by said diaphragm means; a conduit means connecting the outlet of the transfer chamber to the inlet of the metering chamber; a check or nonreturn valve interposed in said conduit means; a pair of pump elements engaging said diaphragm means of said chambers, one forming a transfer pump element and the other forming a meterIng pump element; spring means urging the transfer pump element inwardly to apply pressure to the fuel in the transfer chamber; a lever; a fulcrum located intermediate said pump elements about which said lever may pivot; a connection between one end of said lever and said metering pump element to cause displacement of said metering pump upon oscillation of said lever; a lost motion connection between said lever and said transfer pump element whereby the stroke of said transfer pump is determined by the volume delivered by said metering pump element on its previous cycle; means for oscillating said lever at a speed proportional to the rotational speed of said crankshaft; and means responsive to intake manifold pressure for shifting the position of said fulcrum.

Claim 21

In a fuel injection pump cooperable with the intake manifold of an internal combustion engine and cooperable with the crankshaft of said engine: a casing; a diaphragm means at one side of the casing; closure means clamping the diaphragm means in place, and providing a transfer chamber closed by said diaphragm means and a metering chamber closed by said diaphragm means; a conduit means connecting the outlet of the transfer chamber to the inlet of the metering chamber; a check or nonreturn valve interposed in said conduit means; a pair of pump elements engaging said diaphragm means of said chambers, one forming a transfer pump element and the other forming a meterIng pump element; spring means urging the transfer pump element inwardly to apply pressure to the fuel in the transfer chamber; a lever; a fulcrum located intermediate said pump elements about which said lever may pivot; a connection between one end of said lever and said metering pump element to cause displacement of said metering pump upon oscillation of said lever; a lost motion connection between said lever and said transfer pump element whereby the stroke of said transfer pump is determined by the volume delivered by said metering pump element on its previous cycle; means for oscillating said lever at a speed proportional to the rotational speed of said crankshaft; and means responsive to intake manifold pressure for shifting the position of said fulcrum.

Claim 22

The combination as set forth in claim 15 together with a stop means forming a supplemental fulcrum relieving the first fulcrum when said lever reaches a nadir position.

Claim 23

In a fuel injection pump cooperable with a drive member coupled to the engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path adapted for displacing a volume of fuel from the chamber corresponding to the stroke of the element; a link; an element movable in response to the pressure in said manifold and connected to one end of the link adapted for moving said link in a direction transverse to said path; a fulcrum member carried by the outer end of said link; a single floating lever having a surface engageable with said fulcrum member and engaging said pump element adjacent one end of said lever; a cam carried by said drive member and engaging the other end of said lever adapted for oscillating said lever about said fulcrum member to reciprocate said pump element; means forming a fulcrum guide surface engaging said fulcrum, said fulcrum guide surface arranged to be parallel to said lever when said cam is in its nadir position in relation to said lever; stop means operative when said cam means is near a nadir position relative to said lever, said stop means freeing said fulcrum from the load of said lever during a portion of each cycle.

Claim 24

In a fuel injection pump cooperable with a drive member coupled to the engine and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path adapted for displacing a volume of fuel from the chamber corresponding to the stroke of the element; a link; an element movable in response to the pressure in said manifold and connected to one end of the link adapted for moving said link in a direction transverse to said path; a fulcrum member carried by the outer end of said link; a single floating lever having a surface engageable with said fulcrum member and engaging said pump element adjacent one end of said lever; a cam carried by said drive member and engaging the other end of said lever adapted for oscillating said lever about said fulcrum member to reciprocate said pump element; means forming a fulcrum guide surface engaging said fulcrum, said fulcrum guide surface arranged to be parallel to said lever when said cam is in its nadir position in relation to said lever; stop means operative when said cam means is near a nadir position relative to said lever, said stop means freeing said fulcrum from the load of said lever during a portion of each cycle.

Claim 25

The combination as set forth in claim 17 together with means for adjusting the position of said stop means in such a manner as to alter the ratio of the distance of said pump element from said stop means to the distance of said cam from said stop means.

Claim 26

The combination as set forth in claim 17 together with means for adjusting said fulcrum guide surface to be parallel to said lever when said cam means is at its nadir position relative to said lever.

Claim 27

In a fuel metering pump with a drive member coupled to said engine crankshaft and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a floating lever having one end engaging said pump element; a fulcrum engageable with said lever; an eccentric carried by said drive member and positioned to engage the other end of said lever to cause oscillation of said lever in a plane substantially parallel to the path of reciprocation of the pump element; said eccentric having a zenith and a nadir position respectively corresponding to the ends of the positive and return strokes of said pump element; said pump element and said eccentric causing said lever to impose a load upon said fulcrum; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said eccentric from said fulcrum; means responsive to the pressure within said intake manifold for positioning said fulcrum; stop means operative when said eccentric is near a nadir position relative to said lever, said stop means freeing said fulcrum from the load of said lever during a portion of each cycle.

Claim 28

In a fuel metering pump with a drive member coupled to said engine crankshaft and cooperable with the intake manifold: means forming a pump chamber; a pump element reciprocable in a path for displacing a volume of fuel from the chamber corresponding to the stroke of said element; a floating lever having one end engaging said pump element; a fulcrum engageable with said lever; an eccentric carried by said drive member and positioned to engage the other end of said lever to cause oscillation of said lever in a plane substantially parallel to the path of reciprocation of the pump element; said eccentric having a zenith and a nadir position respectively corresponding to the ends of the positive and return strokes of said pump element; said pump element and said eccentric causing said lever to impose a load upon said fulcrum; the stroke of said pump element corresponding to the ratio of the distance of said pump element from said fulcrum to the distance of said eccentric from said fulcrum; means responsive to the pressure within said intake manifold for positioning said fulcrum; stop means operative when said eccentric is near a nadir position relative to said lever, said stop means freeing said fulcrum from the load of said lever during a portion of each cycle.

Claim 29

The combination as set forth in claim 20 together with means for adjusting the position of said stop means in such a manner as to alter the ratio of the distance of said pump element from said stop means to the distance of said eccentric from said stop means.

Claim 30

The combination as set forth in claim 20 together with a fulcrum guide carrying said stop means, said fulcrum guide providing a surface along which said fulcrum tracks, said surface being substantially parallel to the lever when said eccentric is at its nadir position, said stop means being of a height just exceeding that of said fulcrum.

Claim 31

The combination as set forth in claim 22 together with means for adjusting the position of said fulcrum guide stop means whereby the ratio of the distance of said stop means from pump operating element to the distance of said stop means from said eccentric may be adjusted.

Claim 32

In a fuel injection pump cooperable with a drive member coupled to the engine supplied by said fuel injection pump and cooperable with the intake manifold of the engine: a. means forming a metering pump chamber having an inlet; b. a pump element for said metering pump chamber and reciprocable in a path for discharging from the chamber and for drawing into the chamber a volume of fuel corresponding to the stroke of the element; c. means forming a transfer pump chamber having an outlet; d. a pump element for said transfer pump chamber and reciprocable in a path for discharging from the chamber and for drawing into the chamber a volume of fuel corresponding to the stroke of the element and in a quantity sufficient to supply the demands of the metering pump chamber; e. conduit means connecting the outlet of said transfer pump chamber to the inlet of said metering pump chamber; f. said conduit means including a nonreturn valve; g. a spring acting directly or indirectly upon said pump element for said transfer pump chamber in order to provide a level of pressure at the nonreturn valve; h. an actuator reciprocated in a path by said drive member; i. a direct connection between the actuator and the pump element for said metering chamber whereby a positive displacement is provided from said metering chamber; j. a lost motion connection between the actuator and the pump element for said transfer pump, said connection being operative to move the pump element for said transfer in opposition to said spring and only during that portion of the cycle of the actuator corresponding to the pressure stroke of the pump element for said metering pump; and k. means for adjusting the stroke of the actuator in accordance with the pressure of the intake manifold without affecting said direct and lost motion connections whereby said lost motion connection causes said transfer pump chamber to operate in accordance with the demand of said metering pump chamber.

Claim 33

In a fuel injection pump cooperable with a drive member coupled to the engine supplied by said fuel injection pump and cooperable with the intake manifold of the engine: a. means forming a metering pump chamber having an inlet; b. a pump element for said metering pump chamber and reciprocable in a path for discharging from the chamber and for drawing into the chamber a volume of fuel corresponding to the stroke of the element; c. means forming a transfer pump chamber having an outlet; d. a pump element for said transfer pump chamber and reciprocable in a path for discharging from the chamber and for drawing into the chamber a volume of fuel corresponding to the stroke of the element and in a quantity sufficient to supply the demands of the metering pump chamber; e. conduit means connecting the outlet of said transfer pump chamber to the inlet of said metering pump chamber; f. said conduit means including a nonreturn valve; g. a spring acting directly or indirectly upon said pump element for said transfer pump chamber in order to provide a level of pressure at the nonreturn valve; h. an actuator reciprocated in a path by said drive member; i. a direct connection between the actuator and the pump element for said metering chamber whereby a positive displacement is provided from said metering chamber; j. a lost motion connection between the actuator and the pump element for said transfer pump, said connection being operative to move the pump element for said transfer in opposition to said spring and only during that portion of the cycle of the actuator corresponding to the pressure stroke of the pump element for said metering pump; and k. means for adjusting the stroke of the actuator in accordance with the pressure of the intake manifold without affecting said direct and lost motion connections whereby said lost motion connection causes said transfer pump chamber to operate in accordance with the demand of said metering pump chamber.

Claim 34

In a lever-type fuel injection pump for internal combustion engines, the combination of: a. a lever-actuated variable-stroke positive displacement injection pump; and b. a lever-actuated demand-type transfer pump feeding said variable-stroke positive displacement injection pump in out-of-phase relationship.

Claim 35

In a lever-type fuel injection pump for internal combustion engines, the combination of: a. a lever-actuated variable-stroke positive displacement injection pump; and b. a lever-actuated demand-type transfer pump feeding said variable-stroke positive displacement injection pump in out-of-phase relationship.

Claim 36

In a lever-type fuel injection pump for internal combustion engines, the combination of: a. a variable-stroke positive displacement injection pump; and b. a demand-type transfer pump feeding said positive displacement injection pump in out-of-phase relationship.

Claim 37

In a lever-type fuel injection pump for internal combustion engines, the combination of: a. a variable-stroke positive displacement injection pump; and b. a demand-type transfer pump feeding said positive displacement injection pump in out-of-phase relationship.