EP0469596A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multi-cylinder two cycle internal combustion engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1991-07-31
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Granted: —
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Expires: 2011-07-31
Abstract
Abstract Two embodiments of two cycle crankcase compression engines wherein exhaust emissions are controlled by controlling the amount of scavenging air flow at low and mid ranges. The scavenging air flow is controlled by balance passages that interconnect at least two crankcase chambers of the engine and in which a control valve is provided.
Inventors
- 👤 Akihiko Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:51
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B33/00; F02B33/02; F02B33/04; F02B33/28; F02B39/00; F02B39/16; F02D9/00; F02D9/02; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B3/00; F02B3/06; F02D2009/0201; F02D2009/0291; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A multi-cylinder two cycle internal combustion engine of the crankcase compression type comprising at least two crankcase chambers to which an air charge is respectively admitted and scavenge passages for transferring a charge from said crankcase chambers to a related combustion chamber, characterized by a balance passage means (49, 101, 201) interconnecting said crankcase chamber (31), and control valves means (52) for controlling the communication of said crankcase chambers (31) with each other through said balance passage (49, 101, 201), said control valves means (52) being operated in response to the load conditions of the engine (21).
Claim 2
Dependent Claim
97 words
A multi-cylinder two cycle internal combustion engine of the crankcase compression type comprising at least two crankcase chambers to which an air charge is respectively admitted and scavenge passages for transferring a charge from said crankcase chambers to a related combustion chamber, characterized by a balance passage means (49, 101, 201) interconnecting said crankcase chamber (31), and control valves means (52) for controlling the communication of said crankcase chambers (31) with each other through said balance passage (49, 101, 201), said control valves means (52) being operated in response to the load conditions of the engine (21).
Claim 3
Dependent Claim
33 words
A multi-cylinder two cycle internal combustion engine as claimed in claim 1, characterized in that the engine (21) operates on a diesel cycle and fuel is injected into the conbustion chambers for combustion.
Claim 4
Dependent Claim
42 words
A multi-cylinder two cycle internal combustion engine as claimed in claims 1 or 2, characterized by an air induction system (33, 34, 36) independent of the balance passage means (49, 101, 201) for introducing an air charge to the crankcase chambers (31).
Claim 5
Dependent Claim
69 words
A multi-cylinder two cycle internal combustion engine as claimed in in at least one of the preceding claims 1 to 3, characterized in that the crankcase chambers (31) are connected with each other via communicating manifold (49, 101, 201) with branching passageways (51) individually communicating each crankcase chamber (31) to said communicating manifold with a throttle valve (52, 103) being disposed in each of said individual branching passageways (51).
Claim 6
Dependent Claim
82 words
A multi-cylinder two cycle internal combustion engine as claimed in at least one of the preceding claims 1 to 4, characterized in that the balance passageway (101) comprises individual communicating passages integrally and internally provided between adjacent crankcase chambers (31) penetrating adjacent walls (102) of the crankcase (32) and accommodating control valves (103) therein commonly operated by a linkage system which, in turn, is actuated by means of a servo stepping motor in response to the detected load conditions of the engine.
Claim 7
Dependent Claim
89 words
A multi-cylinder two cycle internal combustion engine as claimed in claim 4, characterized in that the communicating manifold (201) comprises a hollow pocket member (202) flanged to a side portion if the adjacent crankcase chambers (31) to communicate same by individual branching passageways (203) formed through the flanged attaching portion of the pocket member (202) to accommodate the throttle vavles (204) therein disposed to be rotatably around a common longitudinal axis formed by an integral valve shaft (205) extending along side flange attaching portion of the pocket member (202).
Claim 8
Dependent Claim
48 words
A multi-cylinder two cycle internal combustion engine as claimed in at least one of the preceding claims 1 to 6, characterized in that the throttle valves (52) are of the butterfly flap valve type and a linkage means (55) is provided to operate all throttle valves (52) synchronously.
Claim 9
Dependent Claim
68 words
A multi-cylinder two cycle internal combustion engine as claimed in claim 7, characterized in that the linkage means comprises control levers (54) which are affixed to each of the respective throttle valve shafts (53) supporting the throttle control valves (52) and a control arm (57) that is connected to one of the control levers (55) through a link (58) and is operated by a servo stepping motor (56).
Claim 10
Dependent Claim
87 words
A multi-cylinder two cycle internal combustion engine as claimed in claim 6, characterized in that the throttle valves are directly affixed to said valve shaft (205) to be snychronously rotatable therewith, said individual branching passageways (203) are defined by integral spacer blocks (210) of the housing (208) of the pocket member rotatably supporting the valve shaft (205) and said housing of the pocket member comprises another side flange portion supporting the servo stepping motor (207) directly driving the valve shaft (205) by a bevel wheel train (206).
Claim 11
Dependent Claim
88 words
A multi-cylinder two cycle internal combustion engine as claimed in at least one of the preceding claims 1 to 9, characterized in that said servo stepping motor (56, 207) is actuated by a control unit in response to at least one signal representing the engine load conditions in order to operate the control valve means (52, 103, 204) in response to the detected engine load in order to open the control valves (52) at low and mid-range loads and to close the control valves (52) at higher loads.
References Cited (Backward Citations)
No citation records indexed.
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