Patent US2234055A successfully refreshed from Google Patents.
EP0063385A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Four-cycle internal combustion engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1982-04-20
•
Granted: —
•
Expires: 2002-04-20
Abstract
Abstract In a four-cycle combustion engine of the type having plurality of intake valves and of exhaust valves provided each cylinder, at least an additional intermediate intake vale (5 min ) is arranged in order to enlarge the number of intake valves. Said intermediate intake valve is arranged to face the combustion chamber of the cylinder at a smaller angle ( alpha 1) of inclination with respect to the axis ( l 1) of the cylinder than that of the remaining intake valves (5) which are arranged at both sides of said intermediate intake valve. As a result, any interference between said valves can be avoided.
Inventors
- 👤 Masaaki Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 09:38
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L1/053; F01L1/0532; F01L1/26; F01L1/265; F02; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F1/4221; F01L3/00; F01L2003/25; F01L2003/251; F02B; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2275/00; F02B2275/18; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
A four-cycle internal combustion engine of the type having for each of its cylinders a plurality of intake valves and a plurality of exhaust velves, both types of valve being driven by respective cam shafts as are provided just above said intake and exhaust valves, respectively, characterized in that at least of said intake valves (5) are provided three in number such that the intermediate intake valve (5') is arranged to face a combustion chamber (3) at a smaller angle (α 1 ) of inclination with respect to the axis (81) of said cylinder (a) than the angle (α2) of inclination of the remaining intake valves (5) at both sides of said intermediate intake valve (5'); and in that said three intake valves (5,5'5) have their respective axis (ℓ2) extending to intersect the axis (0 1 ) of a cam shaft (9) driving said intake valves.
Claim 2
Dependent Claim
146 words
A four-cycle internal combustion engine of the type having for each of its cylinders a plurality of intake valves and a plurality of exhaust velves, both types of valve being driven by respective cam shafts as are provided just above said intake and exhaust valves, respectively, characterized in that at least of said intake valves (5) are provided three in number such that the intermediate intake valve (5') is arranged to face a combustion chamber (3) at a smaller angle (α 1 ) of inclination with respect to the axis (81) of said cylinder (a) than the angle (α2) of inclination of the remaining intake valves (5) at both sides of said intermediate intake valve (5'); and in that said three intake valves (5,5'5) have their respective axis (ℓ2) extending to intersect the axis (0 1 ) of a cam shaft (9) driving said intake valves.
Claim 3
Dependent Claim
50 words
Engine according to claim 1, characterized in that the intermediate intake valve (5') is more offset to the outside with respect to a centerline (ℓ3), which divides the combustion chamber (3) into intake and exhaust portions, than the two intake valves (5,5) at both sides of said intermediate valve (5').
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.