US3630643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump
Assignee: Robert Bosch GmbH
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Filing: 1970-02-18
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Granted: 1971-12-28
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Expires: 1990-02-18
Abstract
Abstract A fuel injection pump wherein the fuel distributing piston moves angularly and axially in synchronism with rotational speed of the engine and cooperates with an adjusting member which determines the beginning or termination of fuel injection into the cylinders. The adjusting member forms part of a transducer which is installed directly in the housing of the fuel injection pump and further includes an electromagnet having a rotary armature which is operatively connected with the adjusting member to position the latter in dependency on the intensity of signals which energize the electromagnet and are furnished by an electronic control circuit. The intensity of such signals, and hence the position of the armature, is a function of rotational speed of the engine, position of the gas pedal, and other factors.
Inventors
- 👤 Franz Eheim
- 👤 Konrad Eckert
- 👤 Gerald Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:07
CPC Classifications
F; F02; F02M; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/125; F02M41/126; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02D41/406; F02D41/408; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A fuel injection pump for internal combustion engines, comprising a housing; an engine-driven fuel distributing member provided in said housing; a control circuit arranged to produce control signals whose characteristics vary at least as a function of changes in rotational speed of the engine; and transducer means provided in said housing and responsive to said control signals to influence the distribution of fuel by said member, said transducer means comprising an electromagnet energizable by said control signals and having a rotary armature whose angular position is a function of the characteristics of said control signals.
Claim 2
Dependent Claim
95 words
A fuel injection pump for internal combustion engines, comprising a housing; an engine-driven fuel distributing member provided in said housing; a control circuit arranged to produce control signals whose characteristics vary at least as a function of changes in rotational speed of the engine; and transducer means provided in said housing and responsive to said control signals to influence the distribution of fuel by said member, said transducer means comprising an electromagnet energizable by said control signals and having a rotary armature whose angular position is a function of the characteristics of said control signals.
Claim 3
Dependent Claim
21 words
A pump as defined in claim 1, further comprising stop means for limiting the extent of rotary movement of said armature.
Claim 4
Dependent Claim
67 words
A pump as defined in claim 1, further comprising means for supplying to said control circuit feedback signals whose characteristics vary as a function of changes in rotational speed of the engine, including a gear driven by the engine, a magnetic yoke having at least one serrated portion adjacent to said gear, and an induction coil provided on said yoke and electrically connected with said control circuit.
Claim 5
Dependent Claim
87 words
A pump as defined in claim 1, wherein said housing is provided with a fuel-filled chamber for said distributing member and with a fuel-filled compartment for said electromagnet, and further comprising filter means providing passages for the flow of fuel from said chamber to said compartment, a source of fuel, and means for circulating fuel from said source to said chamber at such a rate that surplus fuel not distributed by said distributing member passes through said filter means, through said compartment and back to said source.
Claim 6
Dependent Claim
86 words
A pump as defined in claim 1, wherein said housing comprises a main portion and cover means separably secured to said main portion and having socket means provided with terminals connected with said control circuit, and further comprising an insulating support provided at that side of said cover means which is concealed when the latter is secured to said main portion, conductors provided on said support and connected with said terminals, and contact means establishing a separable electrical connection between said conductors and said transducer means.
Claim 7
Dependent Claim
41 words
A pump as defined in claim 5, wherein said conductors include second terminals embedded in vitreous material and further comprising connections between said second terminals and the terminals of said socket and a mass of heat-resistant insulating material surrounding said connections.
Claim 8
Dependent Claim
44 words
A pump as defined in claim 1, wherein said transducer means further comprises a shaft rotatable with said armature, an eccentric on said shaft, a collar surrounding and movable axially of said distributing member, and a ball-and-socket connection between said collar and said eccentric.
Claim 9
Dependent Claim
35 words
A pump as defined in claim 7, wherein said distributing member is a piston and further comprising means for effecting axial and angular movements of said piston in synchronism with rotational speed of the engine.
Claim 10
Dependent Claim
41 words
A pump as defined in claim 7, wherein said eccentric is provided at one end of said shaft and said transducer means further comprises a counterpoise provided at the other end of said shaft to balance the weight of said eccentric.
Claim 11
Dependent Claim
17 words
A pump as defined in claim 9, wherein said counterpoise is adjustable with reference to said shaft.
Claim 12
Dependent Claim
30 words
A pump as defined in claim 9, further comprising biasing means for urging said armature to a predetermined starting position in which said armature remains when said electromagnet is deenergized.
Claim 13
Dependent Claim
18 words
A pump as defined in claim 11, wherein said biasing means comprises a spring connected to said counterpoise.
Claim 14
Dependent Claim
31 words
A pump as defined in claim 1, further comprising an inductive feedback signal generator arranged to furnish to said control circuit feedback signals indicative of the angular position of said armature.
Claim 15
Dependent Claim
46 words
A pump as defined in claim 13, wherein said signal generator comprises two series-connected annular inductances connected with said control circuit, a ferromagnetic core movable axially of said inductances, and means for shifting said core in response to changes in the angular position of said armature.
Claim 16
Dependent Claim
27 words
A pump as defined in claim 14, wherein said signal generator further comprises resilient means arranged to yieldably oppose axial movement of said core in one direction.
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |