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公开(公告)号：US11952937B2
公开(公告)日：2024-04-09
申请号：US18334193
申请日：2023-06-13
Applicant: Andreas Stihl AG & Co. KG
Inventor： Michael Grether , Robert Koehli , Richard Wirt , Bernd Engel
CPC classification number: F02B33/02 , F02B75/02 , F02B2075/025
Abstract: A two-stroke engine possesses a cylinder, in the cylinder bore of which a combustion chamber is formed. The combustion chamber is bounded by a reciprocating piston, which drives a crankshaft rotatably mounted in a crankcase. A crankcase interior is fluidically connected to the combustion chamber across at least one transfer channel in at least one position of the piston. The at least one transfer channel emerges with a discharge opening in the crankcase interior and with at least one transfer window on the cylinder bore. It is proposed that all transfer channels have an average length as measured from the discharge opening to the transfer window, the average length being at least 1.5 in relation to the stroke, and that the volume of the crankcase interior including all transfer channels is at most 3.1 in relation to the piston displacement.
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公开(公告)号：US11879381B2
公开(公告)日：2024-01-23
申请号：US17619639
申请日：2020-06-15
Applicant: HUSQVARNA AB
Inventor： Markus Hedberg , Niklas Enander , Tobias Stalfors
CPC classification number: F02B63/02 , F02B25/22 , F02B33/04 , F02B2075/025
Abstract: A two-stroke engine (1) is disclosed comprising a cylinder (2), a piston (3) arranged to reciprocate in the cylinder (2), a crankcase (5), a fuel injector (7) configured to inject fuel into the crankcase (5), an air inlet (9) connected to the crankcase (5), and a stratified scavenging intake (11) connected to the cylinder (2). The engine (1) comprises a throttle (13) configured to control the amount of air supplied to the air inlet (9) and to the stratified scavenging intake (11). The present disclosure further relates to handheld power tool (50) comprising an engine (1).
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公开(公告)号：US11261947B2
公开(公告)日：2022-03-01
申请号：US16501938
申请日：2019-07-08
Applicant: John Richardson , Evan Collins , Aaron Grigg
Inventor： John Richardson , Evan Collins , Aaron Grigg
Abstract: An apparatus to convert linear motion to rotary motion comprising a linear reciprocating member including a track drive member to be coupled to an input device and a rotatable track member including a track to be coupled to an output device wherein the track drive member is disposed to engage the track such that when the input device moves the linear reciprocating member back and forth the track drive member moves along the track rotating the rotatable track member to convert the linear motion imparted to the linear reciprocating member by the input device to the rotary motion of the rotatable track member to operate or drive the output device.
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公开(公告)号：US10605080B2
公开(公告)日：2020-03-31
申请号：US15756235
申请日：2015-09-28
Applicant: Wojciech Gaj-Jablonski
Inventor： Wojciech Gaj-Jablonski
IPC: F01B9/02 , F02B47/02 , F01N5/02 , F02B75/24 , F02B33/32 , F02B75/00 , F01B7/16 , F02M25/00 , F01N5/04 , F02B25/00 , F02M25/038 , F02B75/28 , F02B75/32 , F01B1/08 , F02B43/10 , F02M25/12 , F02B75/02
Abstract: A combustion engine having a pair of two-chamber cylinders, in which double ended pistons are located and directed toward themselves oppositely by the angle 180° and compressed together via crankshafts consisting of two crank elements, which are linked rotationally backward by a spacer bearing. The compression is realized with the use of two connecting rod pairs, from which each connecting rod is linked on the one side to with one crank element, whereas the second connecting rod ends are linked to one of shafts, out of which each shaft is connected with one of pistons via a valve rod. In the middle of each cylinder's wall the outlet channel of compressed air is located as well as the outlet channel of products of combustion together with air. In the head of each cylinder and in the compartment the fuel injector, the water vapor injector and the ignition element are located.
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公开(公告)号：US10344671B2
公开(公告)日：2019-07-09
申请号：US15237513
申请日：2016-08-15
Applicant: Evan John Collins , John Michael Richardson
Inventor： Evan John Collins , John Michael Richardson
IPC: F02B25/00 , F02B75/32 , F01L1/14 , F01L1/02 , F01L1/053 , F01B3/04 , F01B3/10 , F02B75/26 , F02B75/02 , F01L1/047
Abstract: The present invention is helical follower internal combustion engine. The present invention has a smooth, cylindrical follower orthogonally attached to a piston rod. The follower fits into two connected half-cylindrical, helical grooves formed by a two-piece cylindrical sleeve. The two-piece cylindrical sleeve is attached to a rotating cylindrical hub. Reciprocal motion of the piston causes rotation of the rotating cylindrical hub. The present invention has a feature that prevents the piston from rotating. The present invention can create electricity by connecting a rotor coil to the rotating cylindrical hub and placing a stator coil in near proximity. In an alternative embodiment, the present invention has an external drive shaft attached to the rotating cylindrical hub.
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Patent Agency Ranking
公开(公告)号：US10024224B2
公开(公告)日：2018-07-17
申请号：US15346745
申请日：2016-11-09
Applicant: YAMABIKO CORPORATION
Inventor： Takahiro Yamazaki , Shirou Yamaguchi , Takamasa Otsuji , Hidekazu Tsunoda
Abstract: To allow an intake negative pressure to directly act on a fuel outlet formed on a nozzle tube, and to guide a fuel discharged from the fuel outlet in the nozzle tube to the fuel-air mixture passage. A rotary carburetor (200) has a guide plate member (42) downstream of a fuel outlet (30) located in a through-hole (14). The guide plate member (42) has both side edges (42b) away from an inner wall surface (14a) of the through-hole (14). The through-hole (14) is divided by the guide plate member (42) into a first passage portion (44) and a second passage portion (46). The first passage portion (44) communicates through a piston groove with a scavenging passage of a cylinder. The fuel discharged from the fuel outlet (30) is guided by the guide plate member (42) to the second passage portion (46) and is supplied through the second passage portion (46) to a fuel-air mixture passage (24) of an engine intake system.
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公开(公告)号：US09938955B2
公开(公告)日：2018-04-10
申请号：US15028223
申请日：2014-09-22
Applicant: HUSQVARNA AB
Inventor： Johan Assargård , Ricky Sundkvist , Stefan Wixe , Martin Axelsson
IPC: F02P9/00 , F02P5/145 , F02P5/15 , F02B25/00 , F02B63/02 , F02D41/14 , F02D41/22 , F02B25/16 , F02M17/04 , F02B75/02
CPC classification number: F02P9/005 , F02B25/00 , F02B25/16 , F02B63/02 , F02B2075/025 , F02D41/1497 , F02D41/22 , F02D2400/06 , F02M17/04 , F02P5/145 , F02P5/1502 , Y02T10/46
Abstract: An internal combustion engine (1) may include a combustion chamber (41) into which a mixture (40) of fuel and air is supplied, a spark plug (50) disposed proximate to the combustion chamber (41) to ignite the mixture (40) by generating a spark such that ignition of the mixture drives a piston (6) operably coupled to a crank portion (12) of the engine (1), a speed sensor (102) configured to determine engine speed, and an electronic control unit (100) configured to control operation of the spark plug (50). The electronic control unit (100) may be configured to initiate a speed limitation operation in response to engine speed reaching a cut out speed threshold and to control ignition timing within an operating band (320) of ignition angles prior to engine speed reaching the cut out speed threshold. The speed limitation operation may include skipping application of sparks. The electronic control unit (100) is further configured to apply a changed ignition angle (330) relative to the operating band (320) for first at least one spark initiated after the speed limitation operation.
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公开(公告)号：US09810142B2
公开(公告)日：2017-11-07
申请号：US14634113
申请日：2015-02-27
Applicant: IHI Corporation
Inventor： Yutaka Masuda , Takayuki Yamada , Takayuki Hirose , Takahiro Kuge , Takeshi Yamada
IPC: F02B25/00 , F02B25/02 , F02D41/30 , F02B25/04 , F02M21/02 , F02B7/08 , F02D41/32 , F02D41/34 , F02D41/00 , F02D19/10 , F02D41/38 , F02B75/02
CPC classification number: F02B25/02 , F02B7/08 , F02B25/04 , F02B2075/025 , F02D19/10 , F02D41/0027 , F02D41/3094 , F02D41/32 , F02D41/34 , F02D2041/389 , F02D2250/08 , F02D2400/04 , F02M21/0275 , F02M21/0281 , F02M21/0284 , Y02T10/32 , Y02T10/36 , Y02T10/44
Abstract: A uniflow-scavenging-type two-cycle engine includes: a cylinder; a piston that slides in the cylinder; an exhaust port that is provided at a first end of the cylinder; an exhaust valve that opens and closes the exhaust port; a scavenging port that is provided in an inner circumferential surface of a second end of the cylinder in the stroke direction of the piston and inhales an active gas into a combustion chamber in accordance with a sliding movement of the piston; a plurality of fuel injection valves that inject a fuel gas to the active gas, which has been drawn in from the scavenging port to the combustion chamber, to thereby generate a premixed gas; and a fuel injection control unit that varies injection directions of fuel gas injected from a part or all of the fuel injection valves.
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公开(公告)号：US09726070B2
公开(公告)日：2017-08-08
申请号：US14261945
申请日：2014-04-25
Applicant: MAKITA CORPORATION
Inventor： Kenji Imafuku , Yoshifumi Watanabe , Hideaki Hirano , Junichi Masuda
CPC classification number: F02B29/00 , F02B25/14 , F02B25/22 , F02B63/02 , F02B2075/025 , F02F7/0036 , F02M35/1019
Abstract: 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.
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公开(公告)号：US20160237977A1
公开(公告)日：2016-08-18
申请号：US15028223
申请日：2014-09-22
Applicant: HUSQVARNA AB
Inventor： Johan Assargård , Ricky Sundkvist , Stefan Wixe , Martin Axelsson
CPC classification number: F02P9/005 , F02B25/00 , F02B25/16 , F02B63/02 , F02B2075/025 , F02D41/1497 , F02D41/22 , F02D2400/06 , F02M17/04 , F02P5/145 , F02P5/1502 , Y02T10/46
Abstract: An internal combustion engine (1) may include a combustion chamber (41) into which a mixture (40) of fuel and air is supplied, a spark plug (50) disposed proximate to the combustion chamber (41) to ignite the mixture (40) by generating a spark such that ignition of the mixture drives a piston (6) operably coupled to a crank portion (12) of the engine (1), a speed sensor (102) configured to determine engine speed, and an electronic control unit (100) configured to control operation of the spark plug (50). The electronic control unit (100) may be configured to initiate a speed limitation operation in response to engine speed reaching a cut out speed threshold and to control ignition timing within an operating band (320) of ignition angles prior to engine speed reaching the cut out speed threshold. The speed limitation operation may include skipping application of sparks. The electronic control unit (100) is further configured to apply a changed ignition angle (330) relative to the operating band (320) for first at least one spark initiated after the speed limitation operation.
Abstract translation: 内燃机（1）可以包括燃烧室（41），燃料和空气的混合物（40）被供应到燃烧室中，靠近燃烧室设置的火花塞，以点燃混合物（40） ），使得混合物的点火驱动可操作地联接到发动机（1）的曲柄部分（12）的活塞（6），配置成确定发动机转速的速度传感器（102）和电子控制单元 （100），其被配置为控制所述火花塞（50）的操作。 电子控制单元（100）可以被配置为响应于发动机速度达到切断速度阈值而启动速度限制操作，并且在发动机速度达到切断之前控制点火角度的工作频带（320）内的点火正时 速度阈值。 速度限制操作可以包括跳过火花的应用。 电子控制单元（100）还被配置为相对于工作带（320）施加改变的点火角（330），用于在速度限制操作之后首先启动至少一个火花。
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