Fuel injection apparatus for internal combustion engines

Claim 2

In a fuel injection apparatus serving an internal combustion engine, said apparatus being of the known type that has (a) a fuel injection pump delivering fuel quantities to said engine for injection, (b) an rpm regulator having a governor member, (c) means connecting said governor member to said fuel injection pump for varying the terminal moment of injection to vary said fuel quantities, (d) a fuel supply pump connected to said fuel injection pump to supply the latter with fuel, the output pressure of said fuel supply pump being a function of the engine rpm and (e) a hydraulic setting mechanism connected to said fuel injection pump for varying the moment of injection in response to a change in said output pressure, the improvement comprising: A. a housing, within which elements (a)-(e) are mounted, said housing defining an inner chamber into which fuel is delivered by said fuel supply pump; B. means extending into said chamber and defining a channel leading from said chamber to the suction side of said fuel supply pump; and C. means forming part of said governor member, said last named means cooperating with said channel means to change the flow passage section thereof as a function of the position of said governor member for causing a drainage of a variable fuel quantity from said chamber to said suction side of said fuel supply pump for altering the output pressure thereof.

Claim 3

An improvement as defined in claim 1, including a support member on which said governor member is slidably mounted, said support member having a lateral face at which said channel means starts, said channel means being controlled by said governor member at said lateral face.

Claim 4

An improvement as defined in claim 2, wherein said support member is formed of a fixedly held regulator shaft, said channel means starting on the lateral face of said regulator shaft and extending therethrough.

Claim 5

In a fuel injection apparatus serving an internal combustion engine, said apparatus being of the known type that has (a) a fuel injection pump delivering fuel quantities to said engine for injection, (b) an rpm regulator having a governor member, (c) means connecting said governor member to said fuel injection pump for varying the terminal moment of injection to vary said fuel quantities, (d) a fuel supply pump connected to said fuel injection pump to supply the latter with fuel, the output pressure of said fuel supply pump being a function of the engine rpm and (e) a hydraulic setting mechanism connected to said fuel injection pump for varying the moment of injection in response to the change in said output pressure, the improvement comprising: A. a channel means leading from the delivery side of said fuel supply pump to a location of lesser pressure than prevailing at said delivery side; B. means forming part of said governor member, said last named means cooperating with said channel means to change the flow passage section thereof as a function of the position of said governor member for causing a drainage of a variable fuel quantity from the delivery side of said fuel supply pump for altering the output pressure thereof; C. a rotating and reciprocating fuel pumping and distributing member forming part of said fuel injection pump; D. a pump work chamber forming part of said fuEl injection pump and adjoining said fuel pumping and distributing member; E. a relief channel passing through said fuel pumping and distributing member and communicating with said pump work chamber; F. a control sleeve mounted on said pumping and distributing member for controlling said relief channel; G. coupling means for connecting said control sleeve with said governor member, said control sleeve and said coupling means forming part of said means connecting said governor member to said fuel injection pump; H. a centrifugal governor constituting said rpm regulator; I. a governor sleeve forming part of said centrifugal governor and constituting said governor member; and J. a support member on which said governor sleeve is slidably mounted, said support member having a lateral face at which said channel means starts, said channel means being controlled by said governor sleeve at said lateral face.

Claim 6

In a fuel injection apparatus serving an internal combustion engine, said apparatus being of the known type that has (a) a fuel injection pump delivering fuel quantities to said engine for injection, (b) an rpm regulator having a governor member, (c) means connecting said governor member to said fuel injection pump for varying the terminal moment of injection to vary said fuel quantities, (d) a fuel supply pump connected to said fuel injection pump to supply the latter with fuel, the output pressure of said fuel supply pump being a function of the engine rpm and (e) a hydraulic setting mechanism connected to said fuel injection pump for varying the moment of injection in response to the change in said output pressure, the improvement comprising: A. a channel means leading from the delivery side of said fuel supply pump to a location of lesser pressure than prevailing at said delivery side; B. means forming part of said governor member, said last named means cooperating with said channel means to change the flow passage section thereof as a function of the position of said governor member for causing a drainage of a variable fuel quantity from the delivery side of said fuel supply pump for altering the output pressure thereof; C. a rotating and reciprocating fuel pumping and distributing member forming part of said fuel injection pump; D. a pump work chamber forming part of said fuEl injection pump and adjoining said fuel pumping and distributing member; E. a relief channel passing through said fuel pumping and distributing member and communicating with said pump work chamber; F. a control sleeve mounted on said pumping and distributing member for controlling said relief channel; G. coupling means for connecting said control sleeve with said governor member, said control sleeve and said coupling means forming part of said means connecting said governor member to said fuel injection pump; H. a centrifugal governor constituting said rpm regulator; I. a governor sleeve forming part of said centrifugal governor and constituting said governor member; and J. a support member on which said governor sleeve is slidably mounted, said support member having a lateral face at which said channel means starts, said channel means being controlled by said governor sleeve at said lateral face.