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    Stratified scavenging two-stroke engine
    25.
    发明授权
    Stratified scavenging two-stroke engine 有权

    公开(公告)号：US09726070B2

    公开(公告)日：2017-08-08

    申请号：US14261945

    申请日：2014-04-25

    申请人： MAKITA CORPORATION

    发明人： Kenji Imafuku ,  Yoshifumi Watanabe ,  Hideaki Hirano ,  Junichi Masuda

    IPC分类号： F02B25/00 ,  F02B29/00 ,  F02M35/10 ,  F02B25/22 ,  F02B25/14 ,  F02F7/00 ,  F02B63/02 ,  F02B75/02

    CPC分类号： F02B29/00 ,  F02B25/14 ,  F02B25/22 ,  F02B63/02 ,  F02B2075/025 ,  F02F7/0036 ,  F02M35/1019

    摘要： An air-leading type, stratified scavenging two-stroke engine. The engine including a cylinder member and a crankcase joined therewith has an intake passage, an exhaust passage, first and second scavenging passages, a communicating portion and an air passage. The intake passage, the exhaust passage and the air passage are formed in the cylinder member. The first and the second scavenging passages each has a cylinder member-side passage and a crankcase-side passage. The cylinder member-side passages of both of the first and the second scavenging passages communicate with each other via the communicating portion. The air passage is connected to the cylinder member-side passage of the first scavenging passage. In the engine, air for pre-scavenging is introduced from the air passage through a check valve into the cylinder member-side passage of the first scavenging passage, and a part of the introduced air flows into the second scavenging passage through the communicating portion.

    AN INTERNAL COMBUSTION ENGINE
    27.
    发明申请
    AN INTERNAL COMBUSTION ENGINE 有权

    公开(公告)号：US20170167366A1

    公开(公告)日：2017-06-15

    申请号：US15129834

    申请日：2014-03-28

    申请人： VOLVO TRUCK CORPORATION

    发明人： Arne ANDERSSON ,  Bincheng JIANG ,  Staffan LUNDGREN

    IPC分类号： F02B41/08 ,  F02B75/22 ,  F02B75/02 ,  F02B33/22

    CPC分类号： F02B41/08 ,  F02B33/02 ,  F02B33/06 ,  F02B33/18 ,  F02B33/22 ,  F02B41/06 ,  F02B75/02 ,  F02B75/225 ,  F02B2075/025 ,  F02B2075/027

    摘要： An internal combustion engine includes a first low-pressure cylinder housing a first low-pressure piston, and a first high-pressure cylinder housing a first high-pressure piston, the first high-pressure cylinder being arranged in upstream fluid communication with the first low-pressure cylinder for providing exhaust gas into the first low-pressure cylinder. The internal combustion engine further includes a second low-pressure cylinder housing a second low-pressure piston, the second low-pressure cylinder being arranged in upstream fluid communication with the first high-pressure cylinder for providing compressed gas into the first high-pressure cylinder, and a second high-pressure cylinder housing a second high-pressure piston, the second high-pressure cylinder being arranged in downstream fluid communication with the first low-pressure cylinder for receiving compressed gas from the first low-pressure cylinder, and further arranged in upstream fluid communication with the second low-pressure cylinder for providing exhaust gas into the second low-pressure cylinder.

    Virtual variable displacement two-stroke internal combustion piston engine
    29.
    发明授权
    Virtual variable displacement two-stroke internal combustion piston engine 有权

    公开(公告)号：US09664103B2

    公开(公告)日：2017-05-30

    申请号：US14821717

    申请日：2015-08-08

    申请人： John E Wacholtz, Jr.

    发明人： John E Wacholtz, Jr.

    IPC分类号： F01L3/10 ,  F02B25/14 ,  F02B75/02

    CPC分类号： F02B25/145 ,  F01L9/04 ,  F02B75/02 ,  F02B2075/025 ,  F02M25/10

    摘要： A true two-stroke (power and exhaust) internal combustion piston engine combining direct injection of all combustion and working fluid elements with exhaust valve(s) that open early during the power stroke if cylinder pressure falls below exhaust manifold pressure, will operate efficiently from power levels produced by conventional four-stroke engines of a fraction of the displacement of the two-stroke engine to power levels attainable by conventional four-stroke engines of twice the two-stroke engine displacement. No additional external systems will be required to enhance performance or control emissions, as all such enhancements are equivalent to control of the combustion and working fluid components. The magnitude of the combustion charge determines the power, and the makeup of the combustion components determine exhaust emissions. Any implementation of the true two-stroke engine will have the further advantages of requiring only half the cylinders (space and weight) and an equivalent reduction in required support systems. No intake valve train, no intake filter or manifolds, no catalytic converter or exhaust gas recirculation will be required. Some implementations may eliminate other support systems entirely (starter, cooling, exhaust valve train, etc.)