Two-stroke cycle diesel engine
First Claim
1. A two stroke cycle diesel engine, comprising:
- (a) a two-stroke cycle power cylinder-piston assembly, including;
(1) a power cylinder having scavenging ports proximate one axial end thereof and exhaust ports proximate the other axial end thereof, said scavenging ports being arranged substantially symmetrically around the central axis of said power cylinder for generating a substantially uniform, cylindrical, uniflow, spiral scavenging flow through said power cylinder;
(2) first and second horizontally opposed power pistons disposed within said power cylinder;
(3) first and second crankcases;
(4) first and second crankarms, a respective one of said crankarms being operatively connected to a respective one of said power pistons and disposed in a respective one of said crankcases; and
(5) an exhaust pipe in fluid communication with said exhaust ports;
(b) a scavenging pump device including a reciprocating type pump cylinder-piston assembly separate from and driven by said power cylinder-piston assembly, said pump cylinder-piston assembly including a pump cylinder in fluid communication with said power cylinder and a pump piston disposed within said pump cylinder for reciprocating motion, said scavenging pump device supplying scavenging air for said spiral scavenging flow in said power cylinder; and
(c) a scavenging air introducing device for introducing scavenging air to said power cylinder, including(1) a forced swirl generating device in direct fluid communication with said pump cylinder for receiving compressed air from said pump cylinder-piston assembly and with said power cylinder for generating in said power cylinder a forced swirl of scavenging air rotating about the central axis of said power cylinder, said forced swirl generating device being adapted to provide said forced swirl of scavenging air at a greater force than said spiral scavenging flow during a later stage of scavenging operation; and
(2) a fuming device in fluid communication with said scavenging air and with a source of fuel for producing fume from part of said scavenging air and part of said fuel to be supplied to said power cylinder, said fuming device being incorporated in said forced swirl generating device and being disposed within said exhaust pipe, the exhaust gases flowing in said exhaust pipe heating said fuming device and said fume produced thereby by heat exchange.
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Accused Products
Abstract
A two-stroke cycle diesel engine having at least one two-stroke cycle power cylinder-piston assembly incorporating uniflow scavenging and having two horizontally opposed pistons, at least first and second scavenging ports and two crankcases which may perform crankcase compression; a pump assembly including at least one scavenging pump cylinder-piston assembly of the reciprocating type which is separate from and is driven by the power cylinder-piston assembly; a scavenging air introducing device which introduces scavenging air compressed by the pump assembly to the first and the second scavenging ports through first and second passage systems, respectively; and a fume generating device incorporated in the second passage system and supplying fuel mist in an initial part of the air supplied through the second passage system; wherein the fume is supplied as stratified with exhaust gases so as to be heated by the exhaust gases toward decomposition and then the first passage system is interrupted before the pump assembly reaches its top dead center so that thereafter the scavenging air compressed by the pump assembly is all supplied to the second scavenging port thereby generating strong swirl flows in the power cylinder.
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Citations
22 Claims
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1. A two stroke cycle diesel engine, comprising:
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(a) a two-stroke cycle power cylinder-piston assembly, including; (1) a power cylinder having scavenging ports proximate one axial end thereof and exhaust ports proximate the other axial end thereof, said scavenging ports being arranged substantially symmetrically around the central axis of said power cylinder for generating a substantially uniform, cylindrical, uniflow, spiral scavenging flow through said power cylinder; (2) first and second horizontally opposed power pistons disposed within said power cylinder; (3) first and second crankcases; (4) first and second crankarms, a respective one of said crankarms being operatively connected to a respective one of said power pistons and disposed in a respective one of said crankcases; and (5) an exhaust pipe in fluid communication with said exhaust ports; (b) a scavenging pump device including a reciprocating type pump cylinder-piston assembly separate from and driven by said power cylinder-piston assembly, said pump cylinder-piston assembly including a pump cylinder in fluid communication with said power cylinder and a pump piston disposed within said pump cylinder for reciprocating motion, said scavenging pump device supplying scavenging air for said spiral scavenging flow in said power cylinder; and (c) a scavenging air introducing device for introducing scavenging air to said power cylinder, including (1) a forced swirl generating device in direct fluid communication with said pump cylinder for receiving compressed air from said pump cylinder-piston assembly and with said power cylinder for generating in said power cylinder a forced swirl of scavenging air rotating about the central axis of said power cylinder, said forced swirl generating device being adapted to provide said forced swirl of scavenging air at a greater force than said spiral scavenging flow during a later stage of scavenging operation; and (2) a fuming device in fluid communication with said scavenging air and with a source of fuel for producing fume from part of said scavenging air and part of said fuel to be supplied to said power cylinder, said fuming device being incorporated in said forced swirl generating device and being disposed within said exhaust pipe, the exhaust gases flowing in said exhaust pipe heating said fuming device and said fume produced thereby by heat exchange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification