Patent EP0054964A1 successfully refreshed from Google Patents.
EP0054964A1
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EP
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Multi-intake valve type internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1981-12-22
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Granted: —
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Expires: 2001-12-22
Abstract
Abstract A multi-intake valve type engine in which a first intake air passage (7a) for normal operation and a second intake air passage (7b) for high power operation connect the combustion chamber (5) of an internal combustion engine (1) with the outer atmosphere, is provided with an improved intake control system for the engine (1). This improved intake control system provides a control valve (19) in the second intake air passage (7b), which control valve (19) is closed during a low-speed or load running operation and opens during the high power operations of the engine (1). The first and second intake air passages (7a, 7b) are made to have communication downstream of said control valve (19) and in the vicinity of the combustion chamber (5) through a communication port (7c). Preferably, there is provided in said first intake air passage (7a), downstream of the throttle valve (16), a manually-operated valve (18) which opens and closes in response to said throttle valve (16). An interlock mechanism (25-29), can be interposed between said throttle valve (16) and said manually-operated valve (18) so that when the throttle valve (16) is opened said manually-operated valve (18) will open fully before the throttle valve (16) becomes wide-open.
Inventors
- 👤 Takumori Yoshida
- 👤 Akira Yamada
- 👤 Sadayuki Shinmura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10078; F02M35/10085; F01; F01L; F01L1/00; F01L1/44; F02B; F02B27/00; F02B27/02; F02B27/0226; F02B27/0268; F02B27/0273; F02B27/0289; F02B27/0294; F02B31/00; F02B31/08; F02B31/085; F02M35/10242; F02M35/10255; F02M35/104; F02M35/108; F02M35/1085; F02M35/112; F02B2275/00; F02B2275/18; F02M35/10091; F02M35/10111; F02M35/10209; F02M35/10229; F02M35/10373; F02M35/10386; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
A multi-intake valve type engine, comprising both a first intake air passage (7a) to be normally used all over the running range and a second intake air passage (7b) to be used mainly during a high speed or load running operation, which passages are connected through respective intake valves (6a,6b) with a combustion chamber (5) defined by a cylinder (2), a cylinder head (3) and a piston (4), characterised in that said second intake air passage (7b) is equipped with a control valve (19) which is closed during a low speed or load running operation of the engine; and in that said first intake air passage (7a) and said second intake air passage (7b) are made to have communication downstream of said control valve (19) and in the vicinity of said intake valves (6a, 6b) through a communication port (7c).
Claim 2
Dependent Claim
140 words
A multi-intake valve type engine, comprising both a first intake air passage (7a) to be normally used all over the running range and a second intake air passage (7b) to be used mainly during a high speed or load running operation, which passages are connected through respective intake valves (6a,6b) with a combustion chamber (5) defined by a cylinder (2), a cylinder head (3) and a piston (4), characterised in that said second intake air passage (7b) is equipped with a control valve (19) which is closed during a low speed or load running operation of the engine; and in that said first intake air passage (7a) and said second intake air passage (7b) are made to have communication downstream of said control valve (19) and in the vicinity of said intake valves (6a, 6b) through a communication port (7c).
Claim 3
Dependent Claim
139 words
Engine according to claim 1, characterised in that both said first and second intake air passages (7a,7b) are joined to form a manifold (15,16) at the upstream side, in that a manually-operated throttle valve (16) is disposed in said manifold; in that, at the downstream side of said manually-operated throttle valve, there is, besides that control valve (19) as provided in said second intake air passage (7b), a manually-operated valve (18) which opens and closes in response to said throttle valve in said first intake air passage, said control valve (19) opening during high power operation of the engine, and in that an interlock mechanism (25-29) is interposed between said throttle valve (16) and said manually-operated valve (18) so that when the throttle valve (16) is opened, said manually-operated valve will open fully before the throttle valve becomes wide-open.
Claim 4
Dependent Claim
21 words
Engine according to claim 1 or 2, characterised in that said communicating port (7c) is provided in the cylinder head (3).
Claim 5
Dependent Claim
35 words
Engine according to one of claims 1-3, characterised in that said interlock mechanism (25-29) comprises a connecting rod (25) for actuating said manually-operated. valve (18) in dependancy of the operation of said throttle valve (16).
Claim 6
Dependent Claim
44 words
Engine according to one of claims 1-4, characterised in that said connecting rod (25) connects a first lever (22) which transmits the movements of said throttle valve (16) to a second lever (24) which is fixed to a shaft of the manually-operated valve (18).
Claim 7
Dependent Claim
31 words
Engine according to claim 5, characterised in that a cam means (21) is fixed to the shaft of said throttle valve (16), which cam means acts upon said first lever (22).
Claim 8
Dependent Claim
59 words
Engine according to one of claims 4-6, characterised in that said connecting rod (25) and said levers (22,24) are dimensioned and arranged such that said manually-operated valve (18) begins to open when said throttle valve (16) is opened wider than in idle operation position and reaches its fully-open position when said throttle. valve has reached about its half-open position.
Claim 9
Dependent Claim
52 words
Engine according to claim 2, characterised in that said automatic valve (19) is connected to a diaphragm means (28) by virtue of which said automatic valve is kept closed during low-load operation of the engine while being opened under heavier load, the degree of opening being in accordance with the load applied.
Claim 10
Dependent Claim
28 words
Engine according to claim 1, characterised in that said communication port (7c) is made to have substantially the same effective area as that of said first passage (7a).
Claim 11
Dependent Claim
30 words
Engine according to one of claims 2-9, characterised in that said interlock mechanism (25-29) comprises a lost motion mechanism for connecting the throttle valve (16) and the manually-operated valve (18).
References Cited (Backward Citations)
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