Patent US1564017A successfully refreshed from Google Patents.
Patent US4543045A successfully refreshed from Google Patents.
US4543045A
Expired / Lapsed
US
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Fuel injection pump for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1984-06-01
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Granted: 1985-09-24
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Expires: 2004-06-01
Abstract
Abstract Each of the pump cylinders disposed in a line, of the fuel injection pump is surrounded in the vicinity of an overflow opening controlled by control edges of the pump piston by a partial suction chamber embodied as a hollow space. Each of these partial suction chambers is supplied with fuel, beginning at an inflow conduit via a throttled inflow opening and the fuel is carried away again via a return-flow opening into a return-flow conduit common to all the pump cylinders. Because of the crosswise flushing of each individual partial suction chamber the fuel temperature in these partial suction chambers is kept at least virtually constant, in order that identical fuel quantities will be supplied to the individual pump cylinders.
Inventors
- 👤 Ernst Ritter
- 👤 Reinhard Schwartz
- 👤 Johann Warga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:07
CPC Classifications
F; F02; F02M; F02M55/00; F02M55/001; F02M59/00; F02M59/44; F02D; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0606
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
191 words
A fuel injection pump for internal combustion engines, comprising a plurality of pump cylinders disposed in line in reception bores of a pump housing having a top, each of said pump cylinders arranged to receive a pump piston provided with control edges to determine the duration of injection; said control edges arranged to control one overflow opening in a wall of said pump cylinder, said pump cylinder further being surrounded in the vicinity of said at least one overflow opening by a partial suction chamber; said partial suction chamber having an inlet conduit arranged to supply fuel thereto and said conduit arranged to extend in a longitudinal direction of said pump housing, each said partial suction chamber having a separate return-flow conduit connected via return-flow openings, wherein each return-flow opening has a flow-through cross section (A R ) that is smaller than the cross section of said return-flow conduit, and wherein each of said partial suction chambers is embodied as a hollow space which completely surrounds the pump cylinder and communicates with the return-flow conduit only via the return-flow opening and with said inlet conduit only via a throttled inlet opening.
Claim 2
Dependent Claim
191 words
A fuel injection pump for internal combustion engines, comprising a plurality of pump cylinders disposed in line in reception bores of a pump housing having a top, each of said pump cylinders arranged to receive a pump piston provided with control edges to determine the duration of injection; said control edges arranged to control one overflow opening in a wall of said pump cylinder, said pump cylinder further being surrounded in the vicinity of said at least one overflow opening by a partial suction chamber; said partial suction chamber having an inlet conduit arranged to supply fuel thereto and said conduit arranged to extend in a longitudinal direction of said pump housing, each said partial suction chamber having a separate return-flow conduit connected via return-flow openings, wherein each return-flow opening has a flow-through cross section (A R ) that is smaller than the cross section of said return-flow conduit, and wherein each of said partial suction chambers is embodied as a hollow space which completely surrounds the pump cylinder and communicates with the return-flow conduit only via the return-flow opening and with said inlet conduit only via a throttled inlet opening.
Claim 3
Dependent Claim
40 words
A fuel injection pump as defined by claim 1, further wherein each said throttled inlet opening has a flowthrough cross section (A Z ) which is smaller than the flowthrough cross section (A R ) of said associated return-flow opening.
Claim 4
Dependent Claim
50 words
A fuel injection pump as defined by claim 1, further wherein said flowthrough cross section (A Z ) of the next inlet opening in succession--as viewed from the direction of the inlet of the inlet conduit--is larger than the flowthrough cross section (A Z ) of the preceding flowthrough opening.
Claim 5
Dependent Claim
50 words
A fuel injection pump as defined by claim 2, further wherein said flowthrough cross section (A Z ) of the next inlet opening in succession--as viewed from the direction of the inlet of the inlet conduit--is larger than the flowthrough cross section (A Z ) of the preceding flowthrough opening.
Claim 6
Dependent Claim
69 words
A fuel injection pump as defined by claim 1, further wherein said return-flow conduit is embodied as a bore which extends in the longitudinal direction of the pump housing, and said inlet conduit is embodied by a longitudinal bore, and further that said return-flow openings and inlet openings are embodied as connecting bores which discharge directly into said return-flow and inlet conduits respectively, beginning at said partial suction chambers.
Claim 7
Dependent Claim
36 words
A fuel injection pump as defined by claim 5, further wherein said partial suction chambers are defined by a section of said reception bores which bores are machined into the pump housing from the top thereof.
Claim 8
Dependent Claim
47 words
A fuel injection pump as defined by claim 5, further wherein said connecting bores which form said return-flow and inlet openings have an oblique position inclined at an acute angle (α) relative to said longitudinal axis (LA) of said pump cylinders and relative to said pump top.
Claim 9
Dependent Claim
36 words
A fuel injection pump as defined by claim 1, further wherein each of said inlet openings discharge into said partial suction chambers is provided with a check valve arranged to open toward said partial suction chamber.
Claim 10
Dependent Claim
56 words
A fuel injection pump as defined by claim 8, further wherein said check valve is embodied as a flutter valve comprising a movable valve member which is embodied by a tongue-like section of a slotted sheath rolled from spring steel, said torque-like segment adapted to rest positively with a slight initial tension, on said inlet opening.
Claim 11
Dependent Claim
37 words
A fuel injection pump as defined by claim 9, further wherein said sheath is inserted into said partial suction chamber and said movable valve member rests positively on the wall of said section of said reception bore.
Claim 12
Dependent Claim
44 words
A fuel injection pump as defined by claim 9, further wherein said sheath further includes a protrusion bent outwardly therefrom, said protrusion arranged to engage a recess in said wall of said section, to thereby form said partial suction chamber of the reception bore.
Claim 13
Dependent Claim
44 words
A fuel injection pump as defined by claim 10, further wherein said sheath further includes a protrusion bent outwardly therefrom, said protrusion arranged to engage a recess in said wall of said section, to thereby form said partial suction chamber of the reception bore.
Claim 14
Dependent Claim
72 words
A fuel injection pump as defined by claim 6, further wherein said walls of said return-flow and inlet conduits formed by said longitudinal bores are arranged to intersect with said sections of said reception bores which define said partial suction chambers and thereby form flowthrough openings, and further that a sheet-metal insert which includes in its wall said return-flow opening and said throttled inlet opening is inserted into each of said sections.
Claim 15
Dependent Claim
36 words
A fuel injection pump as defined by claim 13, further wherein said sheet-metal insert is embodied by a slotted sheath rolled from sheet steel, the rotational position of said sheath being fixed by a securing element.
Claim 16
Dependent Claim
32 words
A fuel injection pump as defined by claim 14, further wherein said sheet-metal insert further includes a securing element in the form of a protrusion which is bent from a surface thereof.
Claim 17
Dependent Claim
32 words
A fuel injection pump as defined by claim 14, further wherein said sheet-metal insert snugly engages said wall of said section of said reception bore to thereby define said partial suction chamber.
Claim 18
Dependent Claim
32 words
A fuel injection pump as defined by claim 15, further wherein said sheet-metal insert snugly engages said wall of said section of said reception bore to thereby define said partial suction chamber.
Claim 19
Dependent Claim
26 words
A fuel injection pump as defined by claim 13, further wherein said sheet-metal insert comprises hardened steel and thereby serves simultaneously as an impact protection ring.
Claim 20
Dependent Claim
48 words
A fuel injection pump as defined by claim 13, further wherein said sheet-metal insert is provided with a check valve, preferably including a tongue means arranged to open toward said partial suction chamber, said check valve further arranged to block off a return flow through said inflow opening.
Claim 21
Dependent Claim
48 words
A fuel injection pump as defined by claim 14, further wherein said sheet-metal insert is provided with a check valve, preferably including a tongue means arranged to open toward said partial suction chamber, said check valve further arranged to block off a return flow through said inflow opening.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |