公开(公告)号：US20150184596A1

公开(公告)日：2015-07-02

申请号：US14579653

申请日：2014-12-22

Applicant: HITACHI KOKI CO., LTD.

Inventor： Tomoya Ikeda ,  Shigetoshi Ishida

IPC: F02D9/02 ,  F02B63/02 ,  F01P5/02

CPC classification number: F02D9/02 ,  F01P5/02 ,  F02B63/02 ,  F02D2009/0203 ,  F02D2009/0208 ,  F02D2009/021

Abstract: An engine-powered work tool includes an air-cooled engine having a crank shaft, an engine output controller, a wind governor including a governor plate, and a throttle-opening assisting mechanism. The engine output controller includes a throttle valve shaft angularly rotatable about its axis for controlling a rotation speed of the crank shaft based on the angular rotation of the throttle valve shaft. The governor plate is connected to the throttle valve shaft for receiving cooling air generated by a cooling fan connected to the crank shaft. The wind governor controls angular rotation of the throttle valve shaft based on an amount of the received cooling air. The throttle-operation assisting mechanism causes the throttle valve shaft to angularly rotate in a direction to increase the output of the engine within a prescribed rotation speed range, the operation by the throttle-operation assisting mechanism being predominant over the control by the wind governor.

Abstract translation: 发动机动力作业工具包括具有曲柄轴的风冷发动机，发动机输出控制器，包括调速板的调速器和节气门开启辅助机构。 发动机输出控制器包括可围绕其轴线成角度地旋转的节流阀轴，用于基于节流阀轴的角度旋转来控制曲轴的转速。 调速板连接到节流阀轴，用于接收由连接到曲轴的冷却风扇产生的冷却空气。 风力调节器基于所接收的冷却空气的量来控制节气门轴的角度旋转。 节气门操作辅助机构使节流阀轴沿规定转速范围内的发动机的输出方向成角度地旋转，节气门动作辅助机构的运转主要由风力调节器控制。

公开(公告)号：US20150184595A1

公开(公告)日：2015-07-02

申请号：US14579510

申请日：2014-12-22

Applicant: HITACHI KOKI CO., LTD.

Inventor： Hiroshi Honzawa ,  Shigetoshi Ishida

IPC: F02D9/02 ,  F02B63/02 ,  F02P9/00 ,  F01P5/04

CPC classification number: F02B63/02 ,  F01P5/02 ,  F01P5/04 ,  F02D9/1065 ,  F02D31/00 ,  F02D41/1498 ,  F02D2009/0203 ,  F02D2009/0208 ,  F02D2200/101 ,  F02D2400/06 ,  F02M35/1017 ,  F02M35/10196 ,  F02P9/005 ,  F02P11/02

Abstract: An engine-powered work tool includes an engine having a crank shaft, an ignition system, an output controller having a throttle valve shaft for controlling output of the engine, a wind governor connected to the throttle valve shaft, a rotation speed detector and an ignition control unit. The wind governor includes a governor plate movable upon receipt of cooling air generated by a cooling fan to control an angular rotation of the throttle valve shaft. The rotation speed detector detects a rotation speed of the crank shaft. The ignition control unit controls the ignition system based on the rotation speed of the crank shaft detected by the rotation speed detector to reduce the output of the engine when the rotation speed detector determines that the governor plate exceeds a predetermined position.

Abstract translation: 发动机动力作业工具包括具有曲轴，点火系统，具有用于控制发动机输出的节流阀轴的输出控制器，连接到节流阀轴的调速器，转速检测器和点火器 控制单元 风力调节器包括调节器板，该调速器板在接收到由冷却风扇产生的冷却空气时可移动，以控制节流阀轴的角度旋转。 转速检测器检测曲柄轴的转速。 点火控制单元基于由转速检测器检测到的曲轴的转速来控制点火系统，以便当转速检测器判定调速器板超过预定位置时，减小发动机的输出。

公开(公告)号：US09670837B2

公开(公告)日：2017-06-06

申请号：US14579510

申请日：2014-12-22

Applicant: HITACHI KOKI CO., LTD.

Inventor： Hiroshi Honzawa ,  Shigetoshi Ishida

IPC: F02D9/02 ,  F02B63/02 ,  F02M35/10 ,  F02D41/14 ,  F02P9/00 ,  F02P11/02 ,  F02D9/10 ,  F02D31/00 ,  F01P5/04 ,  F01P5/02

CPC classification number: F02B63/02 ,  F01P5/02 ,  F01P5/04 ,  F02D9/1065 ,  F02D31/00 ,  F02D41/1498 ,  F02D2009/0203 ,  F02D2009/0208 ,  F02D2200/101 ,  F02D2400/06 ,  F02M35/1017 ,  F02M35/10196 ,  F02P9/005 ,  F02P11/02

Abstract: An engine-powered work tool includes an engine having a crank shaft, an ignition system, an output controller having a throttle valve shaft for controlling output of the engine, a wind governor connected to the throttle valve shaft, a rotation speed detector and an ignition control unit. The wind governor includes a governor plate movable upon receipt of cooling air generated by a cooling fan to control an angular rotation of the throttle valve shaft. The rotation speed detector detects a rotation speed of the crank shaft. The ignition control unit controls the ignition system based on the rotation speed of the crank shaft detected by the rotation speed detector to reduce the output of the engine when the rotation speed detector determines that the governor plate exceeds a predetermined position.

公开(公告)号：US20140230787A1

公开(公告)日：2014-08-21

申请号：US14239482

申请日：2012-08-14

Applicant: Hitachi Koki Co., Ltd

Inventor： Akira Mezaki ,  Shigetoshi Ishida

IPC: F02P5/02

CPC classification number: F02P5/02 ,  B27B17/083 ,  F02D35/0053 ,  F02D2200/0404 ,  F02D2200/101 ,  F02D2400/04 ,  F02D2400/06 ,  F02N1/005 ,  F02N3/02 ,  F02N2250/06 ,  F02P5/1506 ,  F02P11/00 ,  Y02T10/46

Abstract: An engine is configured such that, during the starting of the engine, when it is being detected that throttle opening has been set at a starting position, if it is detected that the engine speed has exceeded a predetermined speed slightly lower than a speed when a centrifugal clutch becomes an engaged state, a control unit retards the ignition timing from a general angle to a first angle BTDC, and then advances the ignition timing to a second angle at predetermined intervals, and holds the ignition timing at the second angle for a predetermined time period, thereby preventing the engine from stopping due to fouling on the spark plug while suppressing the engine speed at the speed when the centrifugal clutch becomes the engaged state, or less.

Abstract translation: 发动机被构造成使得在发动机起动期间，当检测到节气门开度已经被设定在起始位置时，如果检测到发动机转速已经超过比当a的速度稍低的预定速度 离心式离合器变为接合状态，控制单元将点火正时从一般角度延迟至第一角度BTDC，然后以预定间隔将点火正时提前到第二角度，并将点火正时保持在第二角度预定的 从而防止发动机由于火花塞上的结垢而停止，同时以离心离合器变为接合状态的速度抑制发动机转速。