Patent US5806482A successfully refreshed from Google Patents.
US5806482A
Expired / Lapsed
US
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In-cylinder injection internal combustion engine
Assignee: Mitsubishi Motors Corp
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Filing: 1996-11-27
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Granted: 1998-09-15
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Expires: 2016-11-27
Abstract
Abstract This invention relates to an in-cylinder injection internal combustion engine. A lower wall of a cylinder head, said lower wall defining an upper wall of a combustion chamber, is configured in the form of a pentroof composed of an intake-valve-side, tilted, lower wall and an exhaust-valve-side, tilted, lower wall. A spark plug is arranged in the vicinity of a top part of the pentroof-shaped upper wall of the combustion chamber. A top wall of a piston, said top wall forming a lower wall of the combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall formed so that they correspond the intake-valve-side, tilted, lower wall and the exhaust-valve-side, tilted, lower wall of the cylinder head. A recessed portion is arranged in the intake-valve-side, tilted, top wall in the top wall of the piston.
Inventors
- 👤 Kyoya Igarashi
- 👤 Satoshi Yoshikawa
- 👤 Kenji Goto
- 👤 Takashi Kawabe
- 👤 Katsunori Ueda
- 👤 Nobuaki Murakami
- 👤 Hideyuki Oda
- 👤 Hiromitsu Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:52
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/26; F02B; F02B17/00; F02B17/005; F02B23/00; F02B23/08; F02B23/10; F02B23/104; F02B31/00; F02B31/08; F02B31/085; F02F1/00; F02F1/24; F02F1/242; F02F3/28; F02B1/00; F02B1/02; F02B1/04; F02B2023/106; F02B2023/107; F02B2023/108; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/027; F02B75/12; F02B2075/125; F02B2275/00; F02B2275/40; F02B2275/48; F02B3/00; F02B3/06; F02F1/42; F02F1/4214; F02F2001/241; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
385 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber said fuel injection valve being controlled by an injection controller; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug having a downwardly extending electrode is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, said injection controller controls fuel injection for injecting fuel, during low-load operation range, primarily in a later stage of a compression stroke, and, during high-load operation range, primarily in an intake stroke; said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion; and said intake valve, said fuel injection valve, and said electrode being so positioned relative to said recessed portion of said piston and said recessed portion being so structured as to promote, even during compression, tumble flow of inducted air in the combustion chamber with stratification of inducted air and fuel thereby assuring ignition and enabling lean burning at low-load operation.
Claim 2
Dependent Claim
385 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber said fuel injection valve being controlled by an injection controller; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug having a downwardly extending electrode is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, said injection controller controls fuel injection for injecting fuel, during low-load operation range, primarily in a later stage of a compression stroke, and, during high-load operation range, primarily in an intake stroke; said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion; and said intake valve, said fuel injection valve, and said electrode being so positioned relative to said recessed portion of said piston and said recessed portion being so structured as to promote, even during compression, tumble flow of inducted air in the combustion chamber with stratification of inducted air and fuel thereby assuring ignition and enabling lean burning at low-load operation.
Claim 3
Dependent Claim
43 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said fuel injection valve is arranged so that, when said piston is located in a vicinity of a top dead center, injection fuel is directed toward an inside of said recessed portion.
Claim 4
Dependent Claim
45 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said recessed portion is formed so that a cross-sectional shape thereof along a flowing direction of a flow of inducted air introduced into said combustion chamber is in a form of a circular arc.
Claim 5
Dependent Claim
36 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said top wall of said piston includes a planar portion being formed at least at an outer peripheral portion of said intake-valve-side, tilted, top wall.
Claim 6
Dependent Claim
101 words
An in-cylinder injection internal combustion engine according to claim 4, wherein said recessed portion includes: a flow-in portion formed gently descending from said planar portion so that a flow of inducted air, which has been introduced into said combustion chamber, flows into said recessed portion, a raised portion rising smoothly to guide said flow of inducted air, which has flowed into said recessed portion, from an inside of said recessed portion toward a vicinity of said spark plug, and a connecting portion being formed as a substantially planar surface, said connecting portion smoothly connecting said flow-in portion and said raised portion.
Claim 7
Dependent Claim
38 words
An in-cylinder injection internal combustion engine according to claim 4, wherein said recessed portion is formed extending from said intake-valve-side, tilted, top wall to said planar portion beyond a lower extremity of said intake-valve side, tilted, top wall.
Claim 8
Dependent Claim
58 words
An in-cylinder injection internal combustion engine according to claim 6, wherein said recessed portion is formed as a part of an imaginary spherical surface having a center thereof at a point above said intake-valve-side, tilted, top wall so that said lower extremity of said intake-valve-side, tilted, top wall of said piston is included within said imaginary spherical surface.
Claim 9
Dependent Claim
45 words
An in-cylinder injection internal combustion engine according to claim 7, wherein, when said piston is located near a top dead center, an injection nozzle of said fuel injection valve and a valve element of said intake valve are both included within said imaginary spherical surface.
Claim 10
Dependent Claim
34 words
An in-cylinder injection internal combustion engine according to claim 1, wherein, when said piston is located near a top dead center, a ground electrode of said spark plug is included within said recessed portion.
Claim 11
Dependent Claim
46 words
An in-cylinder injection internal combustion engine according to claim 9, wherein said spark plug is arranged so that, when said piston is located near a top dead center, said ground electrode of said spark plug is located close to an inner surface of said recessed portion.
Claim 12
Dependent Claim
27 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said lower wall of said cylinder head includes a bulged portion for mounting said spark plug.
Claim 13
Dependent Claim
81 words
An in-cylinder injection internal combustion engine according to claim 1, wherein, when said piston is located near a top dead center, a clearance between said exhaust-valve-side, tilted, lower wall of said cylinder head and said exhaust-valve-side, tilted, top wall of said piston in a vicinity of said exhaust valve is set smaller than a clearance between said intake-valve-side, tilted, lower wall of said cylinder head and said intake-valve-side, tilted top wall of said piston in a vicinity of said intake valve.
Claim 14
Dependent Claim
49 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said intake passage is constructed so that a flow of inducted air, which has been introduced into said combustion chamber through said intake valve, is formed as a longitudinal swirl directed toward said top wall of said piston.
Claim 15
Dependent Claim
51 words
An in-cylinder injection internal combustion engine according to claim 13, wherein said intake passage is arranged on one side of an imaginary plane extending parallel to a crankshaft axis and passing through a central axis of said piston, and is arranged extending vertically alongside said imaginary plane in said cylinder head.
Claim 16
Dependent Claim
37 words
An in-cylinder injection internal combustion engine according to claim 1, wherein said exhaust-valve-side, tilted, top wall of said piston includes a groove thereon for providing a space between said exhaust-valve-side, tilted, top wall and said exhaust valve.
Claim 17
Independent Claim
360 words
A method for controlling an in-cylinder injection internal combustion engine, said engine comprises: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted, and a fuel injection valve arranged for directly injecting fuel into said combustion chamber, wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, wherein a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, wherein said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, and wherein said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said method comprising: switching a fuel injection timing between a compression-stroke-injection and an intake-stroke injection in response to an operating condition of said engine; and controlling fuel quantity injected by said injector into said combustion chamber so that an air-fuel mixture leaner than a stoichiometric air/fuel ratio is formed when said compression-stroke-injection is carried out and an air-fuel mixture equivalent to said stoichiometric air/fuel ratio is formed when said intake-stroke-injection is carried out.
Claim 18
Independent Claim
360 words
A method for controlling an in-cylinder injection internal combustion engine, said engine comprises: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted, and a fuel injection valve arranged for directly injecting fuel into said combustion chamber, wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, wherein a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, wherein said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, and wherein said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said method comprising: switching a fuel injection timing between a compression-stroke-injection and an intake-stroke injection in response to an operating condition of said engine; and controlling fuel quantity injected by said injector into said combustion chamber so that an air-fuel mixture leaner than a stoichiometric air/fuel ratio is formed when said compression-stroke-injection is carried out and an air-fuel mixture equivalent to said stoichiometric air/fuel ratio is formed when said intake-stroke-injection is carried out.
Claim 19
Dependent Claim
46 words
The method for controlling an in-cylinder injection internal combustion engine according to claim 16, wherein said compression-stroke-injection is carried out when said engine is operated at low-load and low-speed condition, and said intake-stroke-injection is carried out when said engine is operated at high-load and high-speed condition.
Claim 20
Dependent Claim
302 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said recessed portion including two spherical surfaces with centers thereof offset from each other, and a connecting surface smoothly connecting said two spherical surfaces.
Claim 21
Dependent Claim
302 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through said exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-side, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said recessed portion including two spherical surfaces with centers thereof offset from each other, and a connecting surface smoothly connecting said two spherical surfaces.
Claim 22
Dependent Claim
75 words
An in-cylinder injection internal combustion engine according to claim 18, wherein said centers of said two spherical surfaces are arranged at positions so that in a top plan view of said piston, said centers are offset relative to a plane which extends at a right angle relative to a direction of arrangement of a piston pin and passes through a central axis of said cylinder, in directions away from said plane by a same distance.
Claim 23
Dependent Claim
339 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston forms a lower wall of said combustion chamber, and is configured in the form of a pentroof having an intake-valve-side top wall having a first tilt angle from the cylinder axis and an exhaust-valve-side top wall having a second tilt angle from the cylinder axis, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said top wall of said piston has a ridge, said ridge dividing said intake-valve-side, tilted, top wall and said exhaust-valve-side, tilted, top wall from each other, and said recessed portion is formed extending from said intake-valve-side, tilted, top wall to said exhaust-valve-side, tilted, top wall beyond said ridge.
Claim 24
Dependent Claim
339 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston forms a lower wall of said combustion chamber, and is configured in the form of a pentroof having an intake-valve-side top wall having a first tilt angle from the cylinder axis and an exhaust-valve-side top wall having a second tilt angle from the cylinder axis, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, said top wall of said piston has a ridge, said ridge dividing said intake-valve-side, tilted, top wall and said exhaust-valve-side, tilted, top wall from each other, and said recessed portion is formed extending from said intake-valve-side, tilted, top wall to said exhaust-valve-side, tilted, top wall beyond said ridge.
Claim 25
Dependent Claim
51 words
An in-cylinder injection internal combustion engine according to claim 20, wherein said recessed portion is formed as a part of an imaginary spherical surface having a center thereof at a point above said intake-valve-side, tilted, top wall so that said ridge of said piston is included within said imaginary spherical surface.
Claim 26
Dependent Claim
45 words
An in-cylinder injection internal combustion engine according to claim 21, wherein, when said piston is located near a top dead center, an injection nozzle of said fuel injection valve and a valve element of said intake valve are both included within said imaginary spherical surface.
Claim 27
Dependent Claim
306 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that induced air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said spark plug being arranged with a central axis thereof being tilted toward said opposite side over a predetermined angle relative to a central axis of said cylinder, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion.
Claim 28
Dependent Claim
306 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that induced air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said spark plug being arranged with a central axis thereof being tilted toward said opposite side over a predetermined angle relative to a central axis of said cylinder, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion.
Claim 29
Dependent Claim
316 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a clearance between said exhaust valve and said exhaust-valve-side, tilted, top wall of said piston at mutually closest portions thereof is set between 5 mm and 8 mm.
Claim 30
Dependent Claim
316 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a clearance between said exhaust valve and said exhaust-valve-side, tilted, top wall of said piston at mutually closest portions thereof is set between 5 mm and 8 mm.
Claim 31
Dependent Claim
332 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a distance between said exhaust-valve-side, tilted, lower wall of said cylinder head and said exhaust-valve-side, tilted, top wall of said piston becomes wider toward a center of said combustion chamber, and a flame-propagation space of substantially wedge shape in cross section is formed therebetween.
Claim 32
Dependent Claim
332 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a distance between said exhaust-valve-side, tilted, lower wall of said cylinder head and said exhaust-valve-side, tilted, top wall of said piston becomes wider toward a center of said combustion chamber, and a flame-propagation space of substantially wedge shape in cross section is formed therebetween.
Claim 33
Dependent Claim
57 words
An in-cylinder injection internal combustion engine according to claim 25, wherein said intake-valve-side, tilted, top wall and said exhaust-valve-side, tilted, top wall of said piston are formed at substantially the same inclination and said exhaust-valve-side, tilted, lower wall of said cylinder head is set at an inclination greater than said exhaust-valve-side, tilted, top wall of said piston.
Claim 34
Dependent Claim
58 words
An in-cylinder injection internal combustion engine according to claim 25, wherein said intake-valve-side, tilted, lower wall and said exhaust-side, tilted, lower wall of said cylinder head are formed at substantially the same inclination and said exhaust-valve-side, tilted, top wall of said piston is set at an inclination smaller than said exhaust-valve-side, titled, lower wall of said cylinder head.
Claim 35
Dependent Claim
327 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a ratio of a volume between an inner wall of said recessed portion and said lower wall of said cylinder head over said recessed portion to a total volume of said combustion chamber is at 0.4 to 0.6.
Claim 36
Dependent Claim
327 words
An in-cylinder injection internal combustion engine comprising: a combustion chamber including a top and a bottom thereof defined by a lower wall of a cylinder head and a top wall of a piston fittedly inserted within said cylinder; an intake valve arranged on one side of said lower wall of said cylinder head; an exhaust valve arranged on an opposite side of said lower wall of said cylinder head; an intake passage communicating at one end thereof to said combustion chamber through said intake valve so that inducted air is fed into said combustion chamber; an exhaust passage communicating at one end thereof to said combustion chamber through side exhaust valve so that combustion gas in said combustion chamber is exhausted; and a fuel injection valve arranged for directly injecting fuel into said combustion chamber; wherein said lower wall of said cylinder head, said lower wall forming an upper wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, lower wall formed on said one side and an exhaust-valve-side, tilted, lower wall formed on said opposite side, a spark plug is arranged in a vicinity of a top portion of said pentroof-shaped upper wall of said combustion chamber, said top wall of said piston, said top wall forming a lower wall of said combustion chamber, is configured in the form of a pentroof having an intake-valve-side, tilted, top wall and an exhaust-valve-side, tilted, top wall, which are formed corresponding to said intake-valve-side, tilted, lower wall and said exhaust-valve-sided, tilted, lower wall, respectively, and said intake-valve-side, tilted, top wall of said top wall of said piston is provided with a recessed portion, and when said piston is located near a top dead center, a ratio of a volume between an inner wall of said recessed portion and said lower wall of said cylinder head over said recessed portion to a total volume of said combustion chamber is at 0.4 to 0.6.
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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) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |