公开(公告)号：US10280827B2

公开(公告)日：2019-05-07

申请号：US15547518

申请日：2016-02-26

Applicant: HITACHI KOKI CO., LTD.

Inventor： Naoto Ichihashi ,  Keisuke Ikeda ,  Kazuhiro Ootsuka

IPC: F01P1/02 ,  F02B63/02 ,  F01N13/08 ,  F01P1/06 ,  F01N1/00 ,  F01N1/14 ,  F01N1/08 ,  F01P5/02 ,  F02B63/04 ,  F02B75/16

Abstract: An engine is configured so that a muffler is affixed to the exhaust opening of the cylinder, and the air-cooled cylinder is cooled by a cooling fan. The engine is provided with a muffler cover for covering the muffler, and exhaust gas is discharged inside the muffler cover along the wall surface of the muffler. A second cooling air is combined with the exhaust gas flow from the upstream side thereof to be parallel thereto, and a first cooling air having been caused to flow under the muffler is caused to perpendicularly impinge against the exhaust gas flow on the downstream side thereof. Thus, the cooling airs are combined inside the muffler cover with the exhaust gas flow, and as a result the temperature of the exhaust gas is sufficiently reduced at the time when the exhaust gas is discharged from the opening of the muffler cover to the outside.

公开(公告)号：US10260453B2

公开(公告)日：2019-04-16

申请号：US15504019

申请日：2015-08-21

Applicant: HITACHI KOKI CO., LTD.

Inventor： Yosuke Yoshizaki ,  Naoto Ichihashi

IPC: F02B33/04 ,  F02F3/24 ,  A01D34/68 ,  F02F1/22 ,  F02B25/16 ,  F02B63/02 ,  F16J1/09 ,  F02B75/02 ,  F02B25/14 ,  A01D34/412 ,  A01D101/00

Abstract: The disclosure provides a two-cycle engine and an engine work machine. When a piston is located on the side of a bottom dead center, at a part corresponding to a notch part in the piston, an inner surface of the crank case protrudes toward an interior side to form a crank case first protruding part penetrating through the notch part toward the interior side. Meanwhile, the crank case at a part corresponding to a part without the notch part in the piston is not in a shape protruding toward the interior side. By assembling the piston and the crank case in such shapes, the piston is able to reciprocally move up and down without interfering with the crank case. In this case, by disposing the crank case first protruding part, the volume in the crank case is able to be reduced.

公开(公告)号：US20150078935A1

公开(公告)日：2015-03-19

申请号：US14461412

申请日：2014-08-17

Applicant: HITACHI KOKI CO., LTD.

Inventor： Naoto Ichihashi

IPC: F04B39/06 ,  F04B27/02

CPC classification number: F04B39/066 ,  F04B27/02 ,  F04B35/06 ,  F04B41/02 ,  F04D25/082 ,  F04D25/166 ,  F04D29/326 ,  F04D29/329 ,  H02K9/06 ,  H02K9/14

Abstract: In an air compressor, inner blades of a cooling fan are formed into a centrifugal type, and outer blades are formed into an axial flow type. Exterior air is sucked through a ventilating window by the outer blades, and an air stream (CA1) is generated. A part of the generated air stream flows towards a stator coil, like an air stream (CA2). By a negative pressure generated by the inner blades, the air in the vicinity of the stator coil is sucked to the inner blades, like an air stream (CA3). The sucked air flows out from a motor-side opening towards a non-motor-side opening by a negative pressure generated by the outer blades, is sucked to the outer blades like an air stream (CA4) and flows out together with the air stream (CA1).

Abstract translation: 在空气压缩机中，冷却风扇的内侧叶片形成为离心式，外侧叶片形成为轴流型。 外部空气通过外部叶片从通风窗口吸入，产生空气流（CA1）。 产生的空气流的一部分朝向定子线圈流动，如空气流（CA2）。 通过由内侧叶片产生的负压，定子线圈附近的空气像空气流（CA3）一样被吸入内侧叶片。 吸入的空气通过外部叶片产生的负压从电动机侧开口向非电动机侧开口流出，像空气流（CA4）一样被吸入外部叶片，并与空气流一起流出 （CA1）。

公开(公告)号：US08800505B2

公开(公告)日：2014-08-12

申请号：US13789489

申请日：2013-03-07

Applicant: Hitachi Koki Co., Ltd.

Inventor： Naoto Ichihashi

IPC: F01P1/02

CPC classification number: F01P1/00 ,  F01P1/02

Abstract: An engine for rotating a saw chain serving as a rotating tool includes an engine main body including a crank case and cylinder. A cooling fan for generating forced cooling air is attached to a protruding end of a crank shaft. An engine cover for covering a top of the cylinder is provided in the engine, and an air guiding rib extending in a direction of crossing the cooling air is provided in an inner circumferential surface of the engine cover. In the engine cover, opening portions for exhausting the cooling air outside are provided.

Abstract translation: 用于旋转用作旋转工具的锯链的发动机包括具有曲轴箱和气缸的发动机主体。 用于产生强制冷却空气的冷却风扇附接到曲轴的突出端。 在发动机中设置有用于覆盖气缸顶部的发动机盖，并且在发动机盖的内周面上设置有沿与冷却空气交叉的方向延伸的空气引导肋。 在发动机盖中设置用于排出外部冷却空气的开口部。

公开(公告)号：US09982665B2

公开(公告)日：2018-05-29

申请号：US14461412

申请日：2014-08-17

Applicant: HITACHI KOKI CO., LTD.

Inventor： Naoto Ichihashi

IPC: F01D5/14 ,  F04B39/06 ,  F04B27/02 ,  F04B35/06 ,  F04B41/02 ,  F04D25/16 ,  F04D29/32 ,  H02K9/06 ,  H02K9/14 ,  F04D25/08

CPC classification number: F04B39/066 ,  F04B27/02 ,  F04B35/06 ,  F04B41/02 ,  F04D25/082 ,  F04D25/166 ,  F04D29/326 ,  F04D29/329 ,  H02K9/06 ,  H02K9/14

Abstract: In an air compressor, inner blades of a cooling fan are formed into a centrifugal type, and outer blades are formed into an axial flow type. Exterior air is sucked through a ventilating window by the outer blades, and an air stream (CA1) is generated. A part of the generated air stream flows towards a stator coil, like an air stream (CA2). By a negative pressure generated by the inner blades, the air in the vicinity of the stator coil is sucked to the inner blades, like an air stream (CA3). The sucked air flows out from a motor-side opening towards a non-motor-side opening by a negative pressure generated by the outer blades, is sucked to the outer blades like an air stream (CA4) and flows out together with the air stream (CA1).

公开(公告)号：US20140261255A1

公开(公告)日：2014-09-18

申请号：US14195025

申请日：2014-03-03

Applicant: HITACHI KOKI CO., LTD.

Inventor： Naoto Ichihashi

IPC: F01P1/02

CPC classification number: F01P1/02 ,  F01P5/06 ,  F01P2001/026 ,  F02B63/02

Abstract: An air-cooled engine includes a cylinder provided with a plurality of cooling fins at an outer peripheral surface of the cylinder, a cooling fan, a cylinder cover covering the cylinder, an air guide plate, and an air guide portion. The air guide plate is positioned between an inner surface of the cylinder cover and the fins. The cooling fan generates cooling air stream for cooling the cylinder, and the air guide plate is configured to guide the cooling air stream to flow through a space between the inner surface of the cylinder cover and the fins. A first small space is defined between the air guide plate and the inner surface of the cylinder cover. The air guide portion covers at least a part of the first small space at an upstream side of the air guide plate in the axial direction of the drive shaft.

Abstract translation: 一种风冷发动机包括在气缸的外周面设置有多个冷却翅片的气缸，冷却风扇，覆盖气缸的气缸盖，导气板和空气引导部。 导气板位于气缸盖的内表面和散热片之间。 冷却风扇产生用于冷却气缸的冷却空气流，并且空气引导板构造成引导冷却空气流流过气缸盖的内表面和翅片之间的空间。 在导气板和气缸盖的内表面之间限定第一小空间。 空气引导部在驱动轴的轴向上覆盖导气板的上游侧的第一小​​空间的至少一部分。

公开(公告)号：US20130239914A1

公开(公告)日：2013-09-19

申请号：US13789551

申请日：2013-03-07

Applicant: HITACHI KOKI CO., LTD

Inventor： Naoto Ichihashi

IPC: F01P1/00

CPC classification number: F01P1/00 ,  F01P1/02 ,  F01P9/00

Abstract: The cooling effect of an engine is improved. An engine, which rotationally drives a saw chain serving as a rotating tool, is provided with a crankcase, in which a crankshaft is rotatably built, and a cylinder, in which a piston coupled to the crankshaft via a connecting rod is reciprocatably built. Atop part of the cylinder is covered with a cylinder cover, and a cooling wind toward the cylinder is generated by a cooling fan attached to a projecting end of the crankshaft. The cooling wind is guided by heat-dissipating plates extending along the crankshaft. Exposing parts bulged to outside than a lateral side of the cylinder cover are provided to tips of the heat-dissipating plates.

Abstract translation: 发动机的冷却效果提高。 旋转地驱动用作旋转工具的锯链的发动机设置有曲轴箱，其中曲轴可旋转地构成，其中通过连杆联接到曲轴的活塞可往复运动地构成。 气缸的顶部覆盖有气缸盖，并且通过附接到曲轴的突出端的冷却风扇产生朝向气缸的冷却风。 冷却风由沿着曲轴延伸的散热板引导。 散热片外侧的部分露出气缸盖侧面的部分。

公开(公告)号：US20130180476A1

公开(公告)日：2013-07-18

申请号：US13742167

申请日：2013-01-15

Applicant: Hitachi Koki Co., Ltd.

Inventor： Naoto Ichihashi

IPC: F02B63/02

CPC classification number: F02B63/02 ,  F02M35/044 ,  F02M35/1017 ,  F02M37/007 ,  F02M37/0076

Abstract: A portable engine configured to operate a working machine includes: an engine body mainly configured by a crankcase and a cylinder; a carburetor connected to an inlet port of the cylinder; an air cleaner connected to the carburetor to filter suction air; a cleaner box configured to accommodate the air cleaner; and a fuel tank configured to store fuel which is supplied to the cylinder, wherein at least a part of the fuel tank is located between the cleaner box and the engine body.

Abstract translation: 构造成操作工作机的便携式发动机包括：主要由曲轴箱和气缸构成的发动机主体; 连接到气缸的入口的化油器; 连接到化油器的空气滤清器以吸入空气; 被配置为容纳空气净化器的清洁器箱; 以及燃料箱，其被配置为储存供应到所述气缸的燃料，其中所述燃料箱的至少一部分位于所述吸尘器箱和所述发动机主体之间。

公开(公告)号：US10718243B2

公开(公告)日：2020-07-21

申请号：US15551039

申请日：2016-01-29

Applicant: Hitachi Koki Co., Ltd.

Inventor： Naoto Ichihashi ,  Youhei Kinugawa

IPC: F01N3/05 ,  F01P5/06 ,  F01P1/06 ,  F01P5/02 ,  F01N3/28 ,  F01N13/18 ,  F02B63/02 ,  F01N1/08 ,  F01N13/10 ,  F01N1/14 ,  F01N3/06 ,  F01P1/02 ,  F01P5/04 ,  F02F1/06 ,  F02B75/02

Abstract: The temperature of exhaust gas discharged from a compact air-cooled engine used as a power source for an engine-driven working machine is reduced. An engine has a muffler mounted directly to the exhaust opening of the cylinder, and a resin muffler cover covering the muffler. An exhaust gas restriction member is provided to a wall surface of the muffler, and two exhaust passages serving as outlets for exhaust gas are formed in the exhaust gas restriction member. The exhaust passages are arranged independent of each other, and the streams of discharged exhaust gas are discharged to be slightly separated from each other as the streams flow away from the exhaust openings. The separated streams of discharged exhaust gas form a negative pressure space between the streams promoting the introduction of a cooling air stream into the negative pressure portion. Thus, the temperature of the exhaust gas can be reduced.

公开(公告)号：US09249715B2

公开(公告)日：2016-02-02

申请号：US14195025

申请日：2014-03-03

Applicant: HITACHI KOKI CO., LTD.

Inventor： Naoto Ichihashi

IPC: F01P1/06 ,  F01P1/02 ,  F01P5/06 ,  F02B63/02

CPC classification number: F01P1/02 ,  F01P5/06 ,  F01P2001/026 ,  F02B63/02

Abstract: An air-cooled engine includes a cylinder provided with a plurality of cooling fins at an outer peripheral surface of the cylinder, a cooling fan, a cylinder cover covering the cylinder, an air guide plate, and an air guide portion. The air guide plate is positioned between an inner surface of the cylinder cover and the fins. The cooling fan generates cooling air stream for cooling the cylinder, and the air guide plate is configured to guide the cooling air stream to flow through a space between the inner surface of the cylinder cover and the fins. A first small space is defined between the air guide plate and the inner surface of the cylinder cover. The air guide portion covers at least a part of the first small space at an upstream side of the air guide plate in the axial direction of the drive shaft.

Abstract translation: 一种风冷发动机包括在气缸的外周面设置有多个冷却翅片的气缸，冷却风扇，覆盖气缸的气缸盖，导气板和空气引导部。 导气板位于气缸盖的内表面和散热片之间。 冷却风扇产生用于冷却气缸的冷却空气流，并且空气引导板构造成引导冷却空气流流过气缸盖的内表面和翅片之间的空间。 在导气板和气缸盖的内表面之间限定第一小空间。 空气引导部在驱动轴的轴向上覆盖导气板的上游侧的第一小​​空间的至少一部分。