US4617896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine having three intake valves per cylinder
Assignee: Yamaha Motor Co Ltd
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Filing: 1985-03-14
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Granted: 1986-10-21
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Expires: 2005-03-14
Abstract
Abstract Several embodiments of induction systems for internal combustion engines embodying three intake valves per cylinder. Each system divides the induction passage for each cylinder into at least two parts and a flow controlling throttle valve is positioned in one of the parts. In some embodiments, the parts have equal effective flow areas and in others they have unequal flow areas. In further embodiments, there are three intake passages serving the same chamber and throttle valves are positioned in two if them. In some of these embodiments, the throttle valves are operated simultaneously while in others they are operated in staged sequence.
Inventors
- 👤 Masaaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:36
CPC Classifications
F; F02; F02D; F02D9/00; F02D9/08; F02D9/10; F02D9/109; F02D9/1095; F01; F01L; F01L1/00; F01L1/26; F01L1/265; F02B; F02B27/00; F02B27/02; F02B27/0205; F02B27/0226; F02B27/0289; F02B31/00; F02B31/08; F02B31/087; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10072; F02M35/10242; F02M35/10255; F02M35/104; F02M35/108; F02M35/1085; F02M35/112; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245; F02M35/10209; F02M35/10216; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
An internal combustion engine having a combustion chamber, a plurality of intake passages having independent portions and terminating at at least three intake ports for delivering a charge to said combustion chamber, at least three intake valves in said combustion chamber for controlling the flow through respective of said intake ports to said combustion chamber, and throttle valve means in said independent portions for controlling the flow through at least one of said intake passages independently of the flow through another of said intake passages.
Claim 2
Dependent Claim
85 words
An internal combustion engine having a combustion chamber, a plurality of intake passages having independent portions and terminating at at least three intake ports for delivering a charge to said combustion chamber, at least three intake valves in said combustion chamber for controlling the flow through respective of said intake ports to said combustion chamber, and throttle valve means in said independent portions for controlling the flow through at least one of said intake passages independently of the flow through another of said intake passages.
Claim 3
Dependent Claim
31 words
An internal combustion engine as set forth in claim 1 wherein the intake passages all interconnect with each other downstream of the throttle valve means and upstream of the intake ports.
Claim 4
Dependent Claim
16 words
An internal combustion engine as set forth in claim 2 wherein there are two intake passages.
Claim 5
Dependent Claim
26 words
An internal combustion engine as set forth in claim 3 wherein the throttle valve means comprises a single throttle valve positioned in the one intake passage.
Claim 6
Dependent Claim
18 words
An internal combustion engine as set forth in claim 3 wherein the intake passages have different effective areas.
Claim 7
Dependent Claim
25 words
An internal combustion engine as set forth in claim 5 wherein the throttle valve is in the induction passage having the larger effective flow area.
Claim 8
Dependent Claim
19 words
An internal combustion engine as set forth in claim 2 wherein there are first, second and third intake passages.
Claim 9
Dependent Claim
37 words
An internal combustion engine as set forth in claim 7 wherein the throttle valve means comprises a pair of throttle valves, one positioned in the one intake passage and another positioned in another of the intake passages.
Claim 10
Dependent Claim
19 words
An internal combustion engine as set forth in claim 8 wherein the throttle valves are linked for simultaneous operation.
Claim 11
Dependent Claim
20 words
An internal combustion engine as set forth in claim 8 wherein the throttle valves are opened in a staged sequence.
Claim 12
Dependent Claim
31 words
An internal combustion engine as set forth in claim 2 further including fuel injection means for delivering a fuel charge to the area where the intake passages interconnect with each other.
Claim 13
Dependent Claim
60 words
An internal combustion engine as set forth in claim 10 wherein the intake valves are spaced circumferentially around a cylinder bore of the associated combustion chamber, the unthrottled intake passage being in primary communication with an outermost of the intake valves so as to induce a swirl to the charge delivered to the chamber when the throttle valves are closed.
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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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |