US3797469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributor-type fuel injection pump for internal combustion engines
Assignee: Bosch Corp
•
Filing: 1972-04-03
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Granted: 1974-03-19
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Expires: 1992-04-03
Abstract
Abstract A distributor-type fuel injection pump for internal combustion engines, comprising at least one electrical actuator so moving together with the internal cam ring and so controlled from a control circuit operating with input signals derived from the rotating speed and accelerator position that the movement of said electrical actuator is imparted to the sleeve located around the rotor to determine the effective injection stroke, thereby making the injection quantity capable of being freely varied.
Inventors
- 👤 M Kobayashi
- 👤 Y Ohtani
- 👤 M Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:19
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/04; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02M41/00; F02M41/08; F02M41/14; F02M41/1405; F02D2200/00; F02D2200/70; F02D2200/703; F02D41/406; F02D41/408; F02M2200/00; F02M2200/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
354 words
A distributor type fuel injection pump system for an internal combustion engine, comprising a housing containing an engine driven rotor including transverse bores therein, a central pumping section, and oppositely acting plungers disposed within said bores, pump means for supplying fuel under pressure to said pumping section from an inlet port, a plurality of outlet ports, an annular cam surrounding said rotor for imparting an inward movement to said plungers during rotation of said rotor so that the fuel within said pumping section is pressurized and distributed in sequence to said outlet ports, an oil servo-motor type injection timer means comprising a power piston including a pilot valve for controlling the oil pressure acting on said piston, means for coupling said pilot valve to said annular cam so that displacement of said piston provides corresponding rotation of said annular cam relative to said rotor, at least one sleeve member, rotatably mounted on said rotor, which changes relative position in the direction of rotation between the rotor and said annular cam and which controls opening and closing of a shut-off port in the rotor in communication with said pumping section to thereby control the injection period of said pump means, first and second electromagnetically-operated electrical actuators, said first actuator being coupled to a link member for transmitting the actuating force produced by said actuator to the pilot valve of the oil servo-motor and said second actuator being coupled to support means rotatable with said annular cam for converting the actuating force produced by said second actuator into rotational movement of said at least one sleeve member, and electrical control means comprising a control circuit for receiving at least first and second input signals respectively indicating the operating speed of the engine and the position of the accelerator and for generating, responsive to said signals, an output signal for controlling actuation of said actuator so as to regulate the amounts of fuel injected to control injection timing, and means for connecting said control circuit to each said actuator so that the output signal of said control circuit is a function of the outputs of said actuators.
Claim 2
Dependent Claim
354 words
A distributor type fuel injection pump system for an internal combustion engine, comprising a housing containing an engine driven rotor including transverse bores therein, a central pumping section, and oppositely acting plungers disposed within said bores, pump means for supplying fuel under pressure to said pumping section from an inlet port, a plurality of outlet ports, an annular cam surrounding said rotor for imparting an inward movement to said plungers during rotation of said rotor so that the fuel within said pumping section is pressurized and distributed in sequence to said outlet ports, an oil servo-motor type injection timer means comprising a power piston including a pilot valve for controlling the oil pressure acting on said piston, means for coupling said pilot valve to said annular cam so that displacement of said piston provides corresponding rotation of said annular cam relative to said rotor, at least one sleeve member, rotatably mounted on said rotor, which changes relative position in the direction of rotation between the rotor and said annular cam and which controls opening and closing of a shut-off port in the rotor in communication with said pumping section to thereby control the injection period of said pump means, first and second electromagnetically-operated electrical actuators, said first actuator being coupled to a link member for transmitting the actuating force produced by said actuator to the pilot valve of the oil servo-motor and said second actuator being coupled to support means rotatable with said annular cam for converting the actuating force produced by said second actuator into rotational movement of said at least one sleeve member, and electrical control means comprising a control circuit for receiving at least first and second input signals respectively indicating the operating speed of the engine and the position of the accelerator and for generating, responsive to said signals, an output signal for controlling actuation of said actuator so as to regulate the amounts of fuel injected to control injection timing, and means for connecting said control circuit to each said actuator so that the output signal of said control circuit is a function of the outputs of said actuators.
Claim 3
Dependent Claim
67 words
A distributor type fuel injection pump system as claimed in claim 1 wherein said means for connecting said control circuit and said actuators comprises means for connecting a portion of the output of said control circuit for controlling injection timing responsive to engine speed and said first actuator and the output of said control circuit for controlling the maximum fuel injection quantity characteristic to said second actuator.
Claim 4
Dependent Claim
110 words
A distributor type fuel injection pump system as claimed in claim 1 wherein said at least one sleeve member comprises a first sleeve member which is rotatable to adjust the timing of the closing of a corresponding shut-off port in said rotor and a second sleeve member which is rotatable to adjust the timing of the opening of a corresponding shut-off port in said rotor, to thereby control the injection period of said pump means, said system further comprising means for coupling said first and second sleeve members to said first and second actuators, respectively, and said actuators being secured to said support means which rotates with said annular cam.
Claim 5
Dependent Claim
177 words
A distributor type fuel injection pump system as claimed in claim 1 wherein said oil servo-motor of said injection timing means comprises an oil pressure-operated power piston located within a chamber defined by a housing for The motor, said pilot valve being located within said piston coaxially therewith and being coupled through said link member to one of said actuators, said power piston defining an oil passage therein for communication with a passage on the suction side of said pump means and said chamber and being hydraulically displaced responsive to the displacement of said pilot valve by said one actuator to adjust the injection timing, said rotor including a plurality of peripheral passages forming part of a fuel feed passage for the oil servo-motor, said rotor passages being arranged to open said fuel feed passage in synchronism with the pumping operation when fuel oil is sucked into said pumping section and to close said fuel feed passage at the time of fuel injection so as to close off said fuel feed passage to the oil servo motor.
Claim 6
Dependent Claim
146 words
A distributor type fuel injection pump system as claimed in claim 3 wherein said first actuator is arranged coaxially with said power piston of said oil servo-motor so that the actuating force produced by said first actuator is transmitted directly to said pilot valve, a link rod being connected to said second actuator and cooperating with a first spring to cause rotation of said second sleeve member responsive to the actuating force produced by said second actuator, said spring acting on said link rod through a lever pivotably mounted on a pivot affixed to, and rotatable with, said annular cam, said pump system further comprising detector means for detecting the magnitude of displacement of said link rod and for transmitting a feedback signal in accordance therewith to said electrical control circuit, said detector means and said spring being affixed to the support means for said actuators.
Claim 7
Dependent Claim
208 words
A distributor type fuel injection pump system as claimed in claim 3 wherein said means for coupling said first sleeve member to said first actuator and said second sleeve member to said second actuator each comprises a link rod connected to a corresponding said actuator and including a rack portion, a pinion for engaging a rack portion and rotatable responsive to the movement thereof, a cam mounted on said pinion, and spring means for urging the cam face of said cam into engagement with the corresponding said sleeve member, said system further comprising detector means for sensing the movement of the link rods of said coupling means and for transmitting feedback signals to said control circuit in accordance therewith, and a lever having one end thereof coupled to the link rod of one of said coupling means and having the other end thereof coupled to the link rod of the other said coupling means, pivot means for pivotably mounting said lever secured to and rotatable with, said annular cam, said lever being in engagement with a linkage member connected to the pilot valve of the oil servo-motor so that the pilot valve is actuated in response to rotation of said sleeve members through the corresponding link rods thereof.
Claim 8
Dependent Claim
60 words
A distributor-type fuel injection pump system according to claim 1 further comprising a plurality of monostable circuits differing in output gradient and level and connected in parallel to receive trigger pulses associated with the running speed of the engine, and a synthesizing circuit for combining the outputs of said monostable circuits into an input for controlling a fuel adjusting member.
Claim 9
Dependent Claim
137 words
A distributor-type fuel injection pump system according to claim 1 wherein said control circuit for injection timer, comprises: first monostable circuit receiving trigger pulses associated with the running speed of the engine; second monostable circuit receiving the output of first monostable circuit; third monostable circuit receiving the output of second monostable circuit; first pulse synthesizing circuit which detects the duration of overlap between the output pulse from first monostable circuit and the other output pulse from third monostable circuit; second pulse synthesizing circuit which produces a pulse output synchronized to the output of first pulse synthesizing circuit and varying in pulse width relative to the displacement of a fuel adjusting member and also the output of first pulse synthesizing circuit; said output of second pulse synthesizing circuit being connected to an operating member actuating said pilot valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |