US4858567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1987-11-24
•
Granted: 1989-08-22
•
Expires: 2007-11-24
Abstract
Abstract An internal combustion engine is proposed which operates on a lean fuel-air mixture. The engine comprises an inlet channel which leads to the cylinder with a piston and which opens into the cylinder via an inlet valve. A flap element pivotably mounted about a pivot axis which is seated on one side is disposed in a section of the inlet channel; said section having a rectangular cross-section. The flap also has a rectangular cross-section and is used to produce a rotating flow in the cylinder in operating states other than full load. Displacement of the flap can be effected against the force of a spring by the suction air or by a servomotor controlled by an electronic control device as a function of the operating parameters of the internal combustion engine such as rpm flap position and temperature. The fuel is injected by means of an injection valve downstream of the flap such that when the inlet valve is open there will be formed in a depression in the piston firstly a horizontal layer of a rich fuel-air mixture which can be ignited by a spark plug and above it leaner mixture layers.
Inventors
- 👤 Heinrich Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:53
CPC Classifications
F; F02; F02B; F02B17/00; F02B23/00; F02B23/08; F02B31/00; F02B31/04; F02B31/06; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
236 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, a cylinder head (3) secured to each of said cylinders, a separate inlet channel (7) extending in said cylinder head to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, a separate adjoining section (12) upstream of said fuel injection means connected to each separate inlet channel (7) for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said inlet channel, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of each of said separate adjoining sections (12), pivot means (14) on said wall for said flap means, said flap means further provided with a terminal portion (16), and a spring (20) positioned within each respective adjoining section between said flap means (13) and said wall (15) which applies a closing force on said flap means within said separate adjoining section (12) which, dependent upon suction flow, said flap moves relative to said wall of said inlet channel.
Claim 2
Dependent Claim
236 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, a cylinder head (3) secured to each of said cylinders, a separate inlet channel (7) extending in said cylinder head to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, a separate adjoining section (12) upstream of said fuel injection means connected to each separate inlet channel (7) for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said inlet channel, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of each of said separate adjoining sections (12), pivot means (14) on said wall for said flap means, said flap means further provided with a terminal portion (16), and a spring (20) positioned within each respective adjoining section between said flap means (13) and said wall (15) which applies a closing force on said flap means within said separate adjoining section (12) which, dependent upon suction flow, said flap moves relative to said wall of said inlet channel.
Claim 3
Dependent Claim
83 words
An internal combustion engine as set forth in claim 1, in which each said adjoining section of each of said inlet channels includes a second wall directly opposite said wall, and said rectangular flap means extends from said pivot means on said wall to said second wall to close off said adjoining section to flow, and flow through each said inlet channel depends upon a spacing of said terminal portion of said flap means from said second wall of each adjoining section (12).
Claim 4
Dependent Claim
30 words
An internal combustion engine as claimed in claim 1 in which said flap is actuatable by a servomotor as a function of the operating parameters of said internal combustion engine.
Claim 5
Dependent Claim
30 words
An internal combustion engine as claimed in claim 1, in which said piston comprises means defining a depression which is adapted to receive a terminal portion of a spark plug.
Claim 6
Dependent Claim
38 words
An internal combustion engine as claimed in claim 1, in which said wall of each of adjoining sections of each of said inlet channels further includes a recess adapted to receive said flap means within said adjoining section.
Claim 7
Dependent Claim
32 words
An internal combustion engine as claimed in claim 5, in which said wall further includes a pocket, said pocket arranged to receive one end of said spring which engages said flap means.
Claim 8
Dependent Claim
19 words
An internal combustion engine as claimed in claim 1, in which said flap means is controlled by a servomotor.
Claim 9
Dependent Claim
32 words
An internal combustion engine as claimed in claim 7 in which said servomotor is controlled by an electronic control device as a function of the operating parameters of said internal combustion engine.
Claim 10
Dependent Claim
224 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, said piston includes means defining a depression which is adapted to receive a terminal portion of a spark plug, a cylinder head (3) secured to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, each of said inlet channels (7) including a separate adjoining section (12) upstream of said fuel injection means for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said cylinder, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of each of said separate adjoining sections (12), a spring (20) within said section (12) against which said flap means is actuatable counter to a force of said spring, pivot means (14) on each wall for said flap means, said flap means further provided with a terminal portion (16) which, dependent upon suction flow, moves relative to said wall of said inlet channel.
Claim 11
Dependent Claim
224 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, said piston includes means defining a depression which is adapted to receive a terminal portion of a spark plug, a cylinder head (3) secured to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, each of said inlet channels (7) including a separate adjoining section (12) upstream of said fuel injection means for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said cylinder, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of each of said separate adjoining sections (12), a spring (20) within said section (12) against which said flap means is actuatable counter to a force of said spring, pivot means (14) on each wall for said flap means, said flap means further provided with a terminal portion (16) which, dependent upon suction flow, moves relative to said wall of said inlet channel.
Claim 12
Dependent Claim
30 words
An internal combustion engine as claimed in claim 9, in which said flap is actuatable by a servomotor as a function of the operating parameters of said internal combustion engine.
Claim 13
Dependent Claim
27 words
An internal combustion engine as claimed in claim 9, in which said wall of said inlet channel further includes a recess adapted to receive said flap means.
Claim 14
Dependent Claim
32 words
An internal combustion engine as claimed in claim 9, in which said wall further includes a pocket, said pocket arranged to receive one end of said spring which engages said flap means.
Claim 15
Dependent Claim
30 words
An internal combustion engine as claimed in claim 12, in which said flap is actuatable by a servomotor as a function of the operating parameters of said internal combustion engine.
Claim 16
Dependent Claim
88 words
An internal combustion engine as claimed in claim 9, in which each said adjoining section (12) of each of said inlet channels (7) includes a second wall directly opposite said wall (15), and said rectangular flap means (13) extends from said pivot means on said wall (15) to said second wall to close off said adjoining section to flow, and flow through each said inlet channel (7) depends upon a spacing of said terminal portion of said flap means from said second wall of each adjoining section (12).
Claim 17
Dependent Claim
30 words
An internal combustion engine as claimed in claim 14, in which said flap is actuatable by a servomotor as a function of the operating parameters of said internal combustion engine.
Claim 18
Dependent Claim
213 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, a cylinder head (3) secured to each of said cylinders, a separate inlet channel (7) extending in said cylinder head to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, each of said inlet channels (7) including a separate adjoining section (12) upstream of said fuel injection means for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said cylinder, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of said separate adjoining sections (12), a spring (20) within said section (12) against which said flap means is actuatable counter to a force of said spring, pivot means (14) on each wall for said flap means, said flap means further provided with a terminal portion (16), and said flap means is controlled by a servomotor.
Claim 19
Dependent Claim
213 words
An internal combustion engine comprising more than one cylinder (1), a piston (2) operative in each of said cylinders, a cylinder head (3) secured to each of said cylinders, a separate inlet channel (7) extending in said cylinder head to each of said cylinders, a separate fuel injection means for each of said cylinders inserted into said cylinder head having an outlet directed into said inlet channel for each of said cylinders for injecting fuel into said inlet channel, each of said inlet channels (7) including a separate adjoining section (12) upstream of said fuel injection means for each of said cylinders, each said separate adjoining section (12) for each said separate inlet channel provided with a wall (15) and having a flow area arranged to lead to said cylinder, an inlet valve (5) for each separate cylinder for introducing a fuel-air mixture to said cylinder, a rectangular flap means (13) pivotably disposed in said flow area of said separate adjoining sections (12), a spring (20) within said section (12) against which said flap means is actuatable counter to a force of said spring, pivot means (14) on each wall for said flap means, said flap means further provided with a terminal portion (16), and said flap means is controlled by a servomotor.
Claim 20
Dependent Claim
30 words
An internal combustion engine as claimed in claim 16, in which said flap is actuatable by said servomotor as a function of the operating parameters of said internal combustion engine.
Claim 21
Dependent Claim
32 words
An internal combustion engine as claimed in claim 16, in which said servomotor is controlled by an electronic control device as a function of the operating parameters of said internal combustion engine.
Claim 22
Dependent Claim
89 words
An internal combustion engine as claimed in claim 16, in which each said adjoining section (12) of each of said inlet channels (7) includes a second wall directly opposite said wall (15), and said rectangular flap means (13) extends from said pivot means on said wall (15) to said second wall to close off said adjoining section to flow, and flow through each said inlet channel (7) depends upon a spacing of said terminal portion (16) of said flap means from said second wall of each adjoining section (12).
Claim 23
Dependent Claim
30 words
An internal combustion engine as claimed in claim 19, in which said flap is actuatable by a servomotor as a function of the operating parameters of said internal combustion engine.
References Cited (Backward Citations)
US2154880A
Cited
US3797466A
Cited
US4015577A
Cited
US3972314A
Cited
US3978829A
Cited
US4227505A
Cited
US4271795A
Cited
US4207854A
Cited
US4240387A
Cited
US4465034A
Cited
JPS5688953A
Cited
US4320725A
Cited
US4467749A
Cited
US4473040A
Cited
US4700684A
Cited
US4617897A
Cited
US4586469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |