Patent US4942857A successfully refreshed from Google Patents.
US4942857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion chamber for engine with multiple valves
Assignee: Yamaha Motor Co Ltd
•
Filing: 1989-01-12
•
Granted: 1990-07-24
•
Expires: 2009-01-12
Abstract
Abstract An improved pent roof configured combustion chamber for an internal combustion engine wherein the pent roof has a generally D configuration in top plan view so as to prevent opposing squish flow and to generate swirls within the combustion chamber as the piston approaches top dead center.
Inventors
- 👤 Masaaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:17
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02B; F02B23/00; F02B23/08; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/241; F02F2001/244; F02F2001/245; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
In a combustion chamber for an internal combustion engine comprised of a cylinder bore, a piston reciprocating in said cylinder bore, a cylinder head closing said cylinder bore and defining a combustion chamber with said cylinder bore and said piston, intake valve means on one side of said cylinder bore for admitting a charge to said combustion chamber, and exhaust valve means on the other side of said cylinder bore for discharging of combustion products from said combustion chamber, the improvement comprising said combustion chamber being comprised of a central portion having a pent roof configuration with a peripheral squish area and being configured that the squish flow upon approaching top dead center of said piston is such that the squish flow from one side of the cylinder bore is in a different direction than the squish flow from the other side of the cylinder bore and does not directly oppose the squish flow from the other side of the cylinder bore.
Claim 2
Dependent Claim
162 words
In a combustion chamber for an internal combustion engine comprised of a cylinder bore, a piston reciprocating in said cylinder bore, a cylinder head closing said cylinder bore and defining a combustion chamber with said cylinder bore and said piston, intake valve means on one side of said cylinder bore for admitting a charge to said combustion chamber, and exhaust valve means on the other side of said cylinder bore for discharging of combustion products from said combustion chamber, the improvement comprising said combustion chamber being comprised of a central portion having a pent roof configuration with a peripheral squish area and being configured that the squish flow upon approaching top dead center of said piston is such that the squish flow from one side of the cylinder bore is in a different direction than the squish flow from the other side of the cylinder bore and does not directly oppose the squish flow from the other side of the cylinder bore.
Claim 3
Dependent Claim
56 words
In a combustion chamber as set forth in claim 1 wherein the squish area comprises a pair of angularly related squish areas on one side of the combustion chamber and a squish area on the other side of the combustion chamber that extends generally parallel to a plane dividing the cylinder bore into the two sides.
Claim 4
Dependent Claim
22 words
In a combustion chamber as set forth in claim 2 wherein the combustion chamber is configured by a dome on the piston.
Claim 5
Dependent Claim
24 words
In a combustion chamber as set forth in claim 3 wherein the combustion chamber is further configured by a recess in the cylinder head.
Claim 6
Dependent Claim
47 words
In a combustion chamber as set forth in claim 1 wherein the head of the piston is formed with clearance recesses for the heads of the valves, the recesses lying substantially parallel to the heads of the respective valves but being angularly disposed relative to each other.
Claim 7
Dependent Claim
56 words
In a combustion chamber as set forth in claim 5 wherein the squish area comprises a pair of angularly related squish areas on one side of the combustion chamber and a squish area on the other side of the combustion chamber that extends generally parallel to a plane dividing the cylinder bore into the two sides.
Claim 8
Dependent Claim
22 words
In a combustion chamber as set forth in claim 6 wherein the combustion chamber is configured by a dome on the piston.
Claim 9
Dependent Claim
24 words
In a combustion chamber as set forth in claim 7 wherein the combustion chamber is further configured by a recess in the cylinder head.
Claim 10
Dependent Claim
41 words
In a combustion chamber as set forth in claim 8 wherein there are three intake valves on the side of the cylinder bore having the angularly related squish areas and two exhaust valves on the other side of the cylinder bore.
References Cited (Backward Citations)
US4116179A
Cited
US4381749A
Cited
US4484550A
Cited
US4543929A
Cited
JPS60216013A
Cited
JPS61118517A
Cited
US4741302A
Cited
EP0197914A1
Cited
US4787342A
Cited
JPS62282115A
Cited
US4770139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |