EP0187287A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1985-12-09
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Granted: —
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Expires: 2005-12-09
Abstract
Abstract In a four-valve engine having a pair of intake ports and a pair of exhaust ports, the hole for inserting the spark plug or the fuel injection nozzle is obliquely formed between the exhaust ports so that one end of the hole opens in the lower surface of the cylinder head at the center of the combustion chamber and the other end of the hole opens between the spring seat portions for the exhaust valve springs and the opening of the exhaust ports in the side face of the cylinder head.
Inventors
- 👤 Hiroyuki C/O Mazda Motor Corp. Oda
- 👤 Akira C/O Mazda Motor Corp. Kageyama
- 👤 Yasuyuki C/O Mazda Motor Corp. Morita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:03
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/242; F01; F01L; F01L1/00; F01L1/26; F02F1/42; F02F1/4214; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/20; F02B3/00; F02B3/06; F02F2001/244; F02F2001/245
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
An internal combustion engine comprising a cylinder block having at least one cylinder in which a piston is slidably received, and a cylinder head fixedly mounted on the cylinder block to form at least one combustion chamber therewith, each combustion chamber being provided with a pair of intake ports each of which is opened and closed by an intake valve, a pair of exhaust ports each of which is opened and closed by an exhaust valve and an ignition means receiving hole into which an ignition means such as a spark plug or a fuel injection nozzle is inserted, characterized in that said ignition means receiving hole is obliquely formed in the cylinder head between the exhaust ports so that the inner end of the ignition means receiving hole opens to the combustion chamber substantially in the middle thereof and the outer end of the same opens toward the outside the cylinder head at a portion between, as viewed in the crankshaft direction of the engine, the outer end of the exhaust ports and the portion of the cylinder head at which the valve spring seats for the exhaust valves are formed.
Claim 2
Dependent Claim
192 words
An internal combustion engine comprising a cylinder block having at least one cylinder in which a piston is slidably received, and a cylinder head fixedly mounted on the cylinder block to form at least one combustion chamber therewith, each combustion chamber being provided with a pair of intake ports each of which is opened and closed by an intake valve, a pair of exhaust ports each of which is opened and closed by an exhaust valve and an ignition means receiving hole into which an ignition means such as a spark plug or a fuel injection nozzle is inserted, characterized in that said ignition means receiving hole is obliquely formed in the cylinder head between the exhaust ports so that the inner end of the ignition means receiving hole opens to the combustion chamber substantially in the middle thereof and the outer end of the same opens toward the outside the cylinder head at a portion between, as viewed in the crankshaft direction of the engine, the outer end of the exhaust ports and the portion of the cylinder head at which the valve spring seats for the exhaust valves are formed.
Claim 3
Dependent Claim
21 words
An internal combustion engine as defined in Claim 1 comprising a single overhead camshaft for driving the intake and exhaust valves.
Claim 4
Dependent Claim
40 words
An internal combustion engine as defined in Claim 2 in which said pair of exhaust ports are provided with bight portions at which they are bent to diverge away from each other at a portion near the inner ends thereof.
Claim 5
Dependent Claim
25 words
An internal combustion engine as defined in Claim 3 in which said ignition means receiving hole passes between the bight portions of the exhaust ports.
Claim 6
Dependent Claim
83 words
An internal combustion engine as defined in Claim 4 in which said cylinder block and the cylinder head form therebetween a plurality of combustion chambers and head bolts for securing the cylinder head to the cylinder block are disposed between the exhaust ports of adjacent combustion chambers, the exhaust ports for each combustion chamber being further bent toward each other downstream of the ignition means receiving hole and opening to the side of the cylinder block between an adjacent pair of head bolts.
Claim 7
Dependent Claim
29 words
An internal combustion engine as defined in Claim 5 in which said pair of exhaust ports for each combustion chamber separately open to the side of the cylinder block.
Claim 8
Dependent Claim
36 words
An internal combustion engine as defined in Claim 5 in which said pair of exhaust ports for each combustion chamber are combined together near the side of the cylinder block and open in a single opening.
Claim 9
Dependent Claim
27 words
An internal combustion engine as defined in Claim 2 in which said inner end of the ignition means receiving hole is enlarged to form a semi-spherical cavity.
Claim 10
Dependent Claim
19 words
An internal combustion engine as defined in Claim 8 in which each combustion chamber is of a pent-roof type.
Claim 11
Dependent Claim
24 words
An internal combustion engine as defined in Claim 8 in which the inner tip of the ignition means is accommodated in the semi-spherical cavity.
Claim 12
Dependent Claim
36 words
An internal combustion engine as defined in Claim 2 in which said exhaust valves for opening and closing the pair of exhaust ports for each combustion chamber have valve stems extending in parallel to each other.
Claim 13
Dependent Claim
42 words
An internal combustion engine as defined in Claim 11 in which said exhaust valves for opening and closing the pair of exhaust ports for each combustion chamber are respectively driven by rocker arms which are supported on a first rocker arm shaft.
Claim 14
Dependent Claim
42 words
An internal combustion engine as defined in Claim 12 in which said intake valves for opening and closing the pair of intake ports for each combustion chamber are respectively driven by rocker arms which are supported on a second rocker arm shaft.
References Cited (Backward Citations)
No citation records indexed.
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