US4821726A — Electronic fuel injection device

Claim 1

Independent Claim 166 words

An electronic fuel injection device for feeding fuel to an internal combustion engine comprising: (a) a main body having at least two bores therein; (b) a pumping member which has at least two pistons, each piston being adapted to be fitted into a respective bore, and a base on which said pistons are formed, each bore and its associated piston forming a pump chamber; (c) means for driving said pump member; (d) a fuel supply passage for supplying fuel into said pump chambers; (e) injection nozzles adapted to be secured to a suction pipe of said internal combustion engine in order to supply fuel thereto when a predetermined pressure of fuel is provided thereto; (f) fuel injection passages connecting said injection nozzles to said pump chambers respectively; and (g) a spring member, provided between said main body and said base of said pumping member, for biasing said pumping member in a direction opposite to that in which said pumping member is moved by said driving means.

Claim 2

Dependent Claim 166 words

An electronic fuel injection device for feeding fuel to an internal combustion engine comprising: (a) a main body having at least two bores therein; (b) a pumping member which has at least two pistons, each piston being adapted to be fitted into a respective bore, and a base on which said pistons are formed, each bore and its associated piston forming a pump chamber; (c) means for driving said pump member; (d) a fuel supply passage for supplying fuel into said pump chambers; (e) injection nozzles adapted to be secured to a suction pipe of said internal combustion engine in order to supply fuel thereto when a predetermined pressure of fuel is provided thereto; (f) fuel injection passages connecting said injection nozzles to said pump chambers respectively; and (g) a spring member, provided between said main body and said base of said pumping member, for biasing said pumping member in a direction opposite to that in which said pumping member is moved by said driving means.

Claim 3

Dependent Claim 31 words

A electronic fuel injection device according to claim 1, wherein said pistons are arranged at equal angular intervals of a circle having its center on an axis of said pumping member.

Claim 4

Dependent Claim 19 words

An electronic fuel injection device -according to claim 1, further comprising a sealing member for sealing each pump chamber.

Claim 5

Dependent Claim 48 words

An electronic fuel injection device according to claim 1, wherein said spring member is disposed concentrically with said driving means between an upper surface of a central part of said main body, and a surface of a flange of said pumping member in which said pistons are formed.

Claim 6

Dependent Claim 37 words

An electronic fuel injection device according to claim 1, wherein respective portions of said fuel injection passages between said corresponding pump chambers and fuel inlet ports of said corresponding fuel injection nozzles are the same in volume.

Claim 7

Dependent Claim 33 words

An electronic fuel injection device according to claim 1, wherein each of said injection nozzles has a poppet valve and a spring for continuously biasing said poppet valve in a direction to close.

Claim 8

Dependent Claim 34 words

An electronic fuel injection device according to claim 1, further comprising air vent means for removing air and/or vapor from fuel in said fuel injection passages, said fuel supply passage and/or said pump chambers.

Claim 9

Dependent Claim 25 words

An electronic fuel injection device according to claim 7, wherein said air vent means comprises an air vent valve disposed in said fuel supply passage.

Claim 10

Dependent Claim 26 words

An electronic fuel injection device according to claim 8, wherein said air vent valve is positioned above a fuel inlet port of said fuel supply passage.

Claim 11

Dependent Claim 27 words

An electronic fuel injection device according to claim 9, wherein at least a portion of said fuel supply passage is inclined upward toward said air vent valve.

Claim 12

Dependent Claim 63 words

An electronic fuel injection device according to claim 7, wherein said air vent means comprises: an air vent pipe which is provided between said fuel supply passage and a surge tank of said internal-combustion engine; and a valve for opening said air vent pipe, said valve opening when a pressure of a fuel in said fuel supply passage drops below a predetermined value.

Claim 13

Dependent Claim 31 words

An electronic fuel injection device according to claim 1, wherein said driving means comprises a piezoelectric actuator having a piezoelectric laminate which expands and contracts in response to an electric signal.

Claim 14

Dependent Claim 27 words

An electronic fuel injection device according to claim 12, further comprising: an extension element attached to said piezoelectric laminate; and an adjusting screw for adjusting said extension.

Claim 15

Dependent Claim 36 words

An electronic fuel injection device according to claim 12, wherein said piezoelectric actuator comprises a casing secured detachably to said main body in order that said main body and said piezoelectric actuator can be separately replaced.

Claim 16

Dependent Claim 195 words

An electronic fuel injection device for feeding fuel to an internal combustion engine comprising: (a) a main body having a central part in which at least two bores and a fuel supply passage connected to said bores are formed, said fuel supply passage having branch parts which have ends provided at a predetermined portions of suction pipes of said internal combustion engine; (b) fuel injection nozzles which are secured to said ends of said branch parts, respectively for feeding fuel therefrom into suction pipes of said internal combustion engine; (c) a pumping member which has at least two pistons, one fitted in each of said bores respectively and which can be moved at a high speed to cause fuel in said bores to pressurize; (d) means for driving said pumping member, which contacts with said pumping member and is secured at a predetermined portion on said main body; and (e) a spring member which is provided at a portion between said central part of said main body and said pumping member and continuously biases said pumping member in a direction opposite to that in which said pumping member moves to pressurize fuel in said bores.

Claim 17

Dependent Claim 195 words

An electronic fuel injection device for feeding fuel to an internal combustion engine comprising: (a) a main body having a central part in which at least two bores and a fuel supply passage connected to said bores are formed, said fuel supply passage having branch parts which have ends provided at a predetermined portions of suction pipes of said internal combustion engine; (b) fuel injection nozzles which are secured to said ends of said branch parts, respectively for feeding fuel therefrom into suction pipes of said internal combustion engine; (c) a pumping member which has at least two pistons, one fitted in each of said bores respectively and which can be moved at a high speed to cause fuel in said bores to pressurize; (d) means for driving said pumping member, which contacts with said pumping member and is secured at a predetermined portion on said main body; and (e) a spring member which is provided at a portion between said central part of said main body and said pumping member and continuously biases said pumping member in a direction opposite to that in which said pumping member moves to pressurize fuel in said bores.

Claim 18

Dependent Claim 56 words

An electronic fuel injection device according to claim 15, wherein said pumping member is provided on an upper surface of said central part of said main body, and said driving means comprises a casing which is secured detachably to said upper surface of said main body and a piezoelectric actuator which is accommodated in said casing.

Claim 19

Dependent Claim 52 words

An electronic fuel injection device according to claim 16, further comprising: an extension member attached to said piezoelectric actuator; and adjusting screw means for adjusting said extension, said adjusting screw means being provided at a portion opposite to the portion where said piezoelectric actuator contacts with said pumping member in said casing.

Claim 20

Dependent Claim 35 words

An electronic fuel injection device according to claim 15, wherein said pistons of said pumping member are arranged at equal angular intervals of a circle having its center on an axis of said pumping member.

Claim 21

Dependent Claim 44 words

An electronic fuel injection device according to claim 15, wherein said spring member is disposed concentrically with said driving means between upper surface of said central part of said main body and a surface of said pumping member on which said pistons are formed.

Claim 22

Dependent Claim 33 words

An electronic fuel injection device according to claim 15, further comprising air vent means for removing air and/or vapor from fuel in said fuel injection passages, said fuel supply passage and/or said bores.

Claim 23

Dependent Claim 40 words

An electronic fuel injection device according to claim 15, further comprising means for controlling a rate of fuel injection of said electronic fuel injection device by regulating a voltage and number of voltage application cycles applied to said driving means.

Claim 24

Dependent Claim 39 words

An electronic fuel injection device according to claim 21, further comprising a controlling means for controlling an electric fuel pump of said internal combustion engine so as to control fuel feed pressure in accordance with said voltage application cycles.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-04-17	1992-10-17	1993-04-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-04-17	1996-10-17	1997-04-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-04-17	2000-10-17	2001-04-18	$7700.00	Window Closed / Lapsed

Electronic fuel injection device

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