US4856486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1988-05-16
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Granted: 1989-08-15
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Expires: 2008-05-16
Abstract
Abstract An internal combustion engine has a crankcase coupled to a lower end of a cylinder block, the crankcase including an upper case integrally formed with the cylinder block and a lower case fixed to the upper case. The upper and lower cases have a plurality of journal support walls projecting from inner wall surfaces thereof. An oil pan is fixed to the lower open end of the lower case. A crankshaft is rotatably sandwiched by the journal support walls. A breather chamber is mounted on one side of the crankcase and defined by recesses on confronting surfaces of the upper and lower cases, the breather chamber having one end communicating with the crank chamber and an opposite end communicating with an air intake system. At least one balancer shaft is rotatably supported in a balancer chamber mounted on one side of the crankcase. The upper and lower cases define substantially semicylindrical recesses therein which jointly constitute bearings in which the crankshaft and the balancer shaft are rotatably supported. At least one of the upper and lower mating surfaces has an oil groove communicating with said recesses for being supplied with lubricating oil. The oil groove and the recesses are formed upon casting of the upper or lower case having the at least one of the upper and lower mating surfaces.
Inventors
- 👤 Seiji Mori
- 👤 Toshinari Sonoda
- 👤 Yusuke Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0002; F02F7/0007; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/025; F01M11/00; F01M11/0004; F01M2011/0033; F02B; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816; F02B2275/00; F02B2275/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases jointly defining a crank chamber therebetween, said upper and lower cases having a plurality of journal support walls projecting from inner wall surfaces thereof, said lower case having an open lower end; an oil pan fixed to said open lower end of the lower case; an air intake system coupled to said cylinders; a crankshaft rotatably sandwiched by said journal support walls in said crankcase; and a breather chamber mounted on one side of said crankcase and defined by recesses on confronting surfaces of said upper and lower cases, said breather chamber having one end communicating with said crank chamber and an opposite end communicating with said air intake system.
Claim 2
Dependent Claim
162 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases jointly defining a crank chamber therebetween, said upper and lower cases having a plurality of journal support walls projecting from inner wall surfaces thereof, said lower case having an open lower end; an oil pan fixed to said open lower end of the lower case; an air intake system coupled to said cylinders; a crankshaft rotatably sandwiched by said journal support walls in said crankcase; and a breather chamber mounted on one side of said crankcase and defined by recesses on confronting surfaces of said upper and lower cases, said breather chamber having one end communicating with said crank chamber and an opposite end communicating with said air intake system.
Claim 3
Dependent Claim
18 words
An internal combustion engine according to claim 1, wherein said journal support walls are spaced along said crankshaft.
Claim 4
Dependent Claim
69 words
An internal combustion engine according to claim 1, wherein said breather chamber includes a bottom wall having an inlet defined therein at said one end for introducing blowby gases from said crank chamber into said breather chamber and an upper wall having an outlet defined therein at said opposite end for introducing blowby gases from which oil has been separated from said breather chamber into said air intake system.
Claim 5
Dependent Claim
20 words
An internal combustion engine according to claim 3, wherein said inlet of said breather chamber opens into said oil pan.
Claim 6
Dependent Claim
22 words
An internal combustion engine according to claim 1, further including a baffle plate disposed between said lower case and said oil pan.
Claim 7
Dependent Claim
28 words
An internal combustion engine according to claim 5, wherein said baffle plate is convex toward said oil pan and has a hole defined in a lowest portion thereof.
Claim 8
Dependent Claim
146 words
An internal combustion engine comprising: an engine body having an array of cylinders defined therein; a bearing member fixed to said engine body, said engine body and said bearing member upper and lower mating surfaces, respectively, joined to each other; a crankshaft rotatably and at least one balancer shaft rotatably supported between said engine body and said bearing member parallel to each other; said engine body and said bearing member defining substantially semicylindrical recesses therein which jointly constitute bearings in which said crankshaft and said balancer shaft are rotatably supported; and at least one of said upper and lower mating surfaces having an oil groove communicating with said recesses for being supplied with lubricating oil, said oil groove and said recesses being formed upon casting of said engine body or said bearing member case having said at least one of said upper and lower mating surfaces.
Claim 9
Dependent Claim
146 words
An internal combustion engine comprising: an engine body having an array of cylinders defined therein; a bearing member fixed to said engine body, said engine body and said bearing member upper and lower mating surfaces, respectively, joined to each other; a crankshaft rotatably and at least one balancer shaft rotatably supported between said engine body and said bearing member parallel to each other; said engine body and said bearing member defining substantially semicylindrical recesses therein which jointly constitute bearings in which said crankshaft and said balancer shaft are rotatably supported; and at least one of said upper and lower mating surfaces having an oil groove communicating with said recesses for being supplied with lubricating oil, said oil groove and said recesses being formed upon casting of said engine body or said bearing member case having said at least one of said upper and lower mating surfaces.
Claim 10
Dependent Claim
52 words
An internal combustion engine according to claim 7, wherein said oil groove is defined in said lower mating surface, said lower mating surface also having an arcuate oil groove defined in said recess of the bearing in which said shaft is rotatably supported, said arcuate oil groove communicating with said oil groove.
Claim 11
Dependent Claim
53 words
An internal combustion engine according to claim 8, wherein said engine body has a main oil gallery communicating with said recess of the bearing in which said crankshaft is rotatably supported, for thereby supplying lubricating oil from said main oil gallery through said recess and said oil groove to said arcuate oil groove.
Claim 12
Dependent Claim
159 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases having upper and lower mating surfaces, respectively, joined to each other; a crankshaft rotatably supported in said crankcase; at least one balancer shaft rotatably supported parallel to said crankshaft; said upper and lower cases defining substantially semicylindrical recesses therein which jointly constitute bearings in which said crankshaft and said balancer shaft are rotatably supported; and at least one of said upper and lower mating surfaces having an oil groove communicating with said recesses for being supplied with lubricating oil, said oil groove and said recesses being formed upon casting of said upper or lower case having said at least one of said upper and lower mating surfaces.
Claim 13
Dependent Claim
159 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases having upper and lower mating surfaces, respectively, joined to each other; a crankshaft rotatably supported in said crankcase; at least one balancer shaft rotatably supported parallel to said crankshaft; said upper and lower cases defining substantially semicylindrical recesses therein which jointly constitute bearings in which said crankshaft and said balancer shaft are rotatably supported; and at least one of said upper and lower mating surfaces having an oil groove communicating with said recesses for being supplied with lubricating oil, said oil groove and said recesses being formed upon casting of said upper or lower case having said at least one of said upper and lower mating surfaces.
Claim 14
Dependent Claim
134 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases jointly defining a crank chamber therebetween, said upper and lower cases having a plurality of journal support walls projecting from inner wall surfaces thereof, said lower case having an open lower end; a crankshaft rotatably sandwiched by said journal support walls in said crankcase; a balancer chamber mounted on one side of said crankcase separately from said crank chamber and defined by recesses on confronting surfaces of said upper and lower cases; and a balancer shaft rotatably supported in said balancer chamber.
Claim 15
Dependent Claim
134 words
An internal combustion engine comprising: a cylinder block having an array of cylinders defined therein; a crankcase coupled to a lower end of said cylinder block, said crankcase including an upper case integrally formed with said cylinder block and a lower case fixed to said upper case, said upper and lower cases jointly defining a crank chamber therebetween, said upper and lower cases having a plurality of journal support walls projecting from inner wall surfaces thereof, said lower case having an open lower end; a crankshaft rotatably sandwiched by said journal support walls in said crankcase; a balancer chamber mounted on one side of said crankcase separately from said crank chamber and defined by recesses on confronting surfaces of said upper and lower cases; and a balancer shaft rotatably supported in said balancer chamber.
References Cited (Backward Citations)
US3710774A
Cited
US4028963A
Cited
US4028963B1
Cited
US4000666A
Cited
US4074589A
Cited
US4125036A
Cited
US4095579A
Cited
US4523553A
Cited
US4520770A
Cited
US4497292A
Cited
US4651691A
Cited
US4501234A
Cited
US4502424A
Cited
US4644911A
Cited
US4696267A
Cited
US4690111A
Cited
US4716638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |