Patent US4770150A successfully refreshed from Google Patents.
US4770150A
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US
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Low pressure fuel circulation with fuel preheating for an air-compressing injection internal combustion engine, especially for commercial vehicles
Assignee: Daimler Benz AG
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Filing: 1987-09-10
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Granted: 1988-09-13
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Expires: 2007-09-10
Abstract
Abstract A low pressure fuel circulation with fuel preheating for an air-compressing injection-type internal combustion engine, preferably for commercial vehicles, in which a heat-exchanger and a by-pass by-passing the fine filter and having an excess pressure valve opening in dependence on a predetermined maximum pressure acting on the fine filter as a result of paraffin formation is arranged in an inlet line leading to a high pressure injection pump.
Inventors
- 👤 Gerhard Fraenkle
- 👤 Peter Joppig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:15
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/16; F02M37/00; F02M37/22; F02M37/32; F02M37/36; F02M37/40; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A low pressure fuel circulation with fuel pre-heating means for an air-compressing injection-type internal combustion engine, comprising inlet line means leading from a fuel tank by way of a feed pump to a high pressure injection pump, said inlet line means including pre-filter means, at least one fine filter means and heat-exchanger means operable at low fuel temperatures, the inlet line means further including a by-pass means by-passing the fine filter means, and the by-pass means including an excess pressure valve means opening at a predetermined maximum pressure as a result of paraffin formation acting on the fine filter means.
Claim 2
Dependent Claim
100 words
A low pressure fuel circulation with fuel pre-heating means for an air-compressing injection-type internal combustion engine, comprising inlet line means leading from a fuel tank by way of a feed pump to a high pressure injection pump, said inlet line means including pre-filter means, at least one fine filter means and heat-exchanger means operable at low fuel temperatures, the inlet line means further including a by-pass means by-passing the fine filter means, and the by-pass means including an excess pressure valve means opening at a predetermined maximum pressure as a result of paraffin formation acting on the fine filter means.
Claim 3
Dependent Claim
20 words
A low pressure fuel circulation according to claim 1, wherein the injection-type internal combustion engine is for commercial type vehicles.
Claim 4
Dependent Claim
24 words
A low pressure fuel circulation according to claim 2, wherein said heat-exchanger means is acted upon by cooling water of the internal combustion engine.
Claim 5
Dependent Claim
25 words
A low pressure fuel circulation according to claim 1, wherein the by-pass means includes a throttle means arranged downstream of the excess pressure valve means.
Claim 6
Dependent Claim
23 words
A low pressure fuel circulation according to claim 1, further comprising pressure-monitoring means with a pressure signal transmitter provided in the by-pass means.
Claim 7
Dependent Claim
46 words
A low pressure fuel circulation according to claim 1, further comprising, in addition to the excess pressure valve means, a thermostat means in the by-pass means, said thermostat means operating in dependence on the fuel temperature and being operable to cause locking of the by-pass means.
Claim 8
Dependent Claim
57 words
A low pressure fuel circulation according to claim 6, wherein the excess pressure valve means and the thermostat means form a structural unit, the thermostat means including an expansion element and the excess pressure valve means including a closure member, the expansion element cooperating with the closure member which opens against the force of a return spring.
Claim 9
Dependent Claim
101 words
A low pressure fuel circulation according to claim 7, wherein the structural unit is arranged in a recess of an upper part of the fine filter means and the thermostat means as part of the structural unit is surrounded by two apertured disks supported at a distance from one another and assuring the fuel circumcirculation of the thermostat means, one of said apertured disks being longitudinally displaceably guided together with the thermostat means in the recess against the return spring while the other apertured disk is locally fixedly held and the thermostat means is displaceably supported in the other apertured disk.
Claim 10
Dependent Claim
44 words
A low pressure fuel circulation according to claim 8, wherein the return spring as part of the excess pressure valve means supportingly abuts at both apertured disks and the expansion element rests on the closure member constructed as ball under the return spring force.
References Cited (Backward Citations)
US3548796A
Cited
DE2430636A1
Cited
US4187813A
Cited
GB2028921A
Cited
SU723203A1
Cited
DE3034730A1
Cited
SU950939A1
Cited
US4377149A
Cited
US4454851A
Cited
US4600825A
Cited
US4478197A
Cited
US4574762A
Cited
US4625701A
Cited
DE3442980A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |