US4971008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porting arrangement for multi-valve engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1989-05-26
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Granted: 1990-11-20
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Expires: 2009-05-26
Abstract
Abstract An improved cylinder head arrangement for a multiple valve internal combustion engine wherein the cylinder head supports three intake valves that communicate with a common intake passage extending through one side of the cylinder head. An associated manifold is affixed to the cylinder head and has two inlet openings and a transition portion that forms a smooth transition from these two inlet openings to the single intake passage of the cylinder head.
Inventors
- 👤 Isao Morishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:48
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/104; F02M35/108; F02M35/1085; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F02M35/1015; F02M35/10177; F02M35/10196; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/20; F02B61/00; F02B61/02; F02B61/06; F02F2001/244; F02F2001/245; F02M35/16; F02M35/162
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A porting arrangement for an internal combustion engine having a combustion chamber, three intake valves for serving said combustion chamber, an intake port means serving said combustion chamber and terminating at individual valve seats for each of said intake valves, said intake port means having two inlet openings separated by a portion that converges toward said valve seats.
Claim 2
Dependent Claim
58 words
A porting arrangement for an internal combustion engine having a combustion chamber, three intake valves for serving said combustion chamber, an intake port means serving said combustion chamber and terminating at individual valve seats for each of said intake valves, said intake port means having two inlet openings separated by a portion that converges toward said valve seats.
Claim 3
Dependent Claim
68 words
A porting arrangement as set forth in claim 1 wherein the combustion chamber is formed by a cylinder head with the cylinder head having a single intake port opening through a side thereof communicating with the individual intake valve seats and wherein a manifold is affixed to said side of said cylinder head, said manifold having the two inlet openings and the portion converging toward the valve seats.
Claim 4
Dependent Claim
20 words
A portion arrangement as set forth in claim 2 further including separate charge formers communicating respectively with the inlet openings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |