US5486087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unit for delivering fuel from a supply tank to an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1994-11-14
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Granted: 1996-01-23
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Expires: 2014-11-14
Abstract
Abstract A unit for delivering fuel from a supply tank to an internal combustion engine, having a disklike impeller driven to revolve in a pump chamber, on whose circumference a number of blades are disposed, and having at least one supply conduit, disposed in the region of the impeller blades and open toward the impeller, in a chamber wall defining the pump chamber on the face end and axially adjoining the impeller, which supply conduit extends via a split ring around the pivot axis of the impeller from an inlet opening into the pump chamber to an outlet opening from it. In order to assure that sufficient fuel can be aspirated unthrottled in the presence of gas bubbles in the fuel, in particular when the fuel is hot, the supply conduit is embodied in the region of the inlet opening as larger by a factor of 2 than the usual supply conduit cross section; the cross section of the supply conduit then decreases continuously, beginning at the inlet end, forming a compression conduit.
Inventors
- 👤 Juergen Treiber
- 👤 Michael Kuehn
- 👤 Mathias Rollwage
- 👤 Dietrich Trachte
- 👤 Willi Strohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:24
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/04; F02M37/048; F02M37/20; F04; F04D; F04D5/00; F04D5/002; F04D5/007; F05; F05B; F05B2250/00; F05B2250/50; F05B2250/503
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
260 words
A unit for delivering fuel from a supply tank to an internal combustion engine, comprising an intake cap (12), a disk-shaped impeller (7), that revolves in a pump chamber (11), a number of blades (5) extending radially outward are disposed on a circumference of said impeller, at least one supply conduit (15), which is open toward the impeller (7) and disposed in a region of the blades (5) of the impeller (7) in chamber walls (13 and 16) defining the pump chamber (11) on a face end and axially adjoining the impeller (7), said supply conduit (15) extends via a split ring around a pivot axis of the impeller (7) from an inlet opening (19) into the pump chamber (11) to an outlet opening (21) out of said pump chamber and has a different flow cross section in the flow course between the inlet opening (19) and the outlet opening (21), the cross section of the supply conduit (15), from an end that covers the inlet opening (19) toward the outlet end, decreases continuously over a certain angular range initially, forming a compression conduit (25), and once a certain value is reached continues constant as far as an end of the supply conduit (15) that covers the outlet opening (21), and between an inlet end and an outlet end of the supply conduit (15), a web (31) is formed in the intake cap (12) at a level of the blades (5) of the impeller (7), in which web a degassing bore (29) is provided that communicates with a low-pressure chamber.
Claim 2
Dependent Claim
260 words
A unit for delivering fuel from a supply tank to an internal combustion engine, comprising an intake cap (12), a disk-shaped impeller (7), that revolves in a pump chamber (11), a number of blades (5) extending radially outward are disposed on a circumference of said impeller, at least one supply conduit (15), which is open toward the impeller (7) and disposed in a region of the blades (5) of the impeller (7) in chamber walls (13 and 16) defining the pump chamber (11) on a face end and axially adjoining the impeller (7), said supply conduit (15) extends via a split ring around a pivot axis of the impeller (7) from an inlet opening (19) into the pump chamber (11) to an outlet opening (21) out of said pump chamber and has a different flow cross section in the flow course between the inlet opening (19) and the outlet opening (21), the cross section of the supply conduit (15), from an end that covers the inlet opening (19) toward the outlet end, decreases continuously over a certain angular range initially, forming a compression conduit (25), and once a certain value is reached continues constant as far as an end of the supply conduit (15) that covers the outlet opening (21), and between an inlet end and an outlet end of the supply conduit (15), a web (31) is formed in the intake cap (12) at a level of the blades (5) of the impeller (7), in which web a degassing bore (29) is provided that communicates with a low-pressure chamber.
Claim 3
Dependent Claim
57 words
The unit according to claim 1, in which the compression conduit (25), beginning on the inlet end of the supply conduit (15), extends over an angular range of approximately 90° to 130° in a direction of the outlet opening (21), and the entire supply conduit (15) extends over approximately 300° around the axis of the impeller (7).
Claim 4
Dependent Claim
53 words
The unit according to claim 1, in which a cross section of the compression conduit (25) is greater by at least a factor of two on its inlet end that covers the inlet opening (19) than on its outlet end remote from the inlet opening (19) and adjoining the remaining supply conduit (15).
Claim 5
Dependent Claim
53 words
The unit according to claim 2, in which a cross section of the compression conduit (25) is greater by at least a factor of two on its inlet end that covers the inlet opening (19) than on its outlet end remote from the inlet opening (19) and adjoining the remaining supply conduit (15).
Claim 6
Dependent Claim
32 words
The unit according to claim 1, in which a cross section of the compress ion conduit (25) decreases vertically to the chamber wall via a linear decrease in the conduit depth (T).
Claim 7
Dependent Claim
31 words
The unit according to claim 2, in which a cross section of the compression conduit (25) decreases vertically to the chamber wall via a linear decrease in the conduit depth (T).
Claim 8
Dependent Claim
31 words
The unit according to claim 3, in which a cross section of the compression conduit (25) decreases vertically to the chamber wall via a linear decrease in the conduit depth (T).
Claim 9
Dependent Claim
30 words
The unit according to claim 5, in which the compression conduit (25) changes into the constant-cross-section region of the supply conduit (15) via a transition (27) embodied as a step.
Claim 10
Dependent Claim
30 words
The unit according to claim 6, in which the compression conduit (25) changes into the constant-cross-section region of the supply conduit (15) via a transition (27) embodied as a step.
Claim 11
Dependent Claim
30 words
The unit according to claim 7, in which the compression conduit (25) changes into the constant-cross-section region of the supply conduit (15) via a transition (27) embodied as a step.
Claim 12
Dependent Claim
49 words
The unit according to claim 1, in which a cross section of the compression conduit (25) decreases via a progressive decrease in the depth (T) and width (B) of the conduit in a direction of the remaining supply conduit (15) and after attaining this cross section changes continuously thereto.
Claim 13
Dependent Claim
49 words
The unit according to claim 2, in which a cross section of the compression conduit (25) decreases via a progressive decrease in the depth (T) and width (B) of the conduit in a direction of the remaining supply conduit (15) and after attaining this cross section changes continuously thereto.
Claim 14
Dependent Claim
49 words
The unit according to claim 3, in which a cross section of the compression conduit (25) decreases via a progressive decrease in the depth (T) and width (B) of the conduit in a direction of the remaining supply conduit (15) and after attaining this cross section changes continuously thereto.
Claim 15
Dependent Claim
33 words
The unit according to claim 4, in which the degassing bore (29) that communicates with a low-pressure chamber discharges into the end of the compression conduit (25) remote from the inlet opening (19).
Claim 16
Dependent Claim
33 words
The unit according to claim 8, in which the degassing bore (29) that communicates with a low-pressure chamber discharges into the end of the compression conduit (25) remote from the inlet opening (19).
Claim 17
Dependent Claim
97 words
The unit according to claim 1, in which between a radially outward-pointing circumferential face of the impeller (7) and a wall of the pump chamber (11), an overflow cross section remains, by way of which the fuel can overflow virtually unthrottled from the supply conduit (15), having the inlet opening (19), in a first chamber wall (13) into the supply conduit (15) symmetrically opposing the inlet opening in a second chamber wall (16) that has the outlet opening (21), and one compression conduit (25) each, symmetrically opposite one another, is provided in the two supply conduits (15).
Claim 18
Dependent Claim
92 words
The unit according to claim 1, in which a radially outward-pointing ends of the blades (5) of the impeller (7) are joined to one another by means of a ring (33) radially surrounding the impeller (7), and that the supply conduits (15), extending across the region of the free blade ends, communicate hydraulically with one another in the pump chamber walls (13, 15) via a slight flow cross section at the impeller (7), and a compression conduit (25) is provided only in the supply conduit (15) that has the inlet opening (19).
Claim 19
Dependent Claim
82 words
The unit according to claim 1, in which a radially outward-pointing end of the blades (5) of the impeller (7) communicate with one another by means of a ring (33) radially surrounding the impeller (7), and that the supply conduits (15) extending via the region of the free blade ends communicate hydraulically with one another in the pump chamber walls (13, 15) via the impeller (7), and one compression conduit (25) each, opposite one another, is provided in both supply conduits (15).
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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) | 1999-01-22 | 1999-07-24 | 2000-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-22 | 2003-07-24 | 2004-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-22 | 2007-07-24 | 2008-01-23 | $7700.00 | Window Closed / Lapsed |