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    A CARBURETOR SYSTEM FOR A CARBURETOR ENGINE
    1.
    发明授权
    A CARBURETOR SYSTEM FOR A CARBURETOR ENGINE 有权

    公开(公告)号：EP2697498B1

    公开(公告)日：2018-10-31

    申请号：EP11863533.3

    申请日：2011-04-15

    申请人： Husqvarna AB

    发明人： LINDSTRÖM, Fredrik ,  MARTINSSON, Pär ,  OTTOSSON, Magnus ,  RYDBERG, Rikard

    IPC分类号： F02M1/16 ,  F02B63/02 ,  F16K31/02

    CPC分类号： F02M1/16 ,  F02B63/02 ,  F02M17/04

    摘要： A fuel supply system for small two-stroke internal combustion engines for e.g. chain saws, line trimmers and similar hand-held power-tools including a diaphragm carburetor (20) equipped with a purging system (80a, 81a) or priming system (80b, 81b) for facilitating starting of the engine (1). Downstream of the diaphragm (30), the carburetor has a fuel valve (60) with a fuel cavity (73), which when the valve is not closed being connected via a fuel conduit (37) to a fuel nozzle (35, 36) in a main air passage (21) in the carburetor. The purging system or priming system including a fuel line (80a; 80b), which is provided with a manually operated pump (81a; 81b) and is connected between a fuel tank (26) and either the fuel cavity (73) or the fuel conduit (37).

    Fuel metering system for a carburetor
    8.
    发明公开
    Fuel metering system for a carburetor 审中-公开
    化油器的燃油计量系统

    公开(公告)号：EP1391605A1

    公开(公告)日：2004-02-25

    申请号：EP02019450.2

    申请日：2002-08-30

    申请人： WALBRO CORPORATION

    发明人： Galka, William E. ,  Hilbig, Bradley L. ,  Roche, Ronald H. ,  Van Allen, James E.

    IPC分类号： F02M17/04

    CPC分类号： F02M17/04 ,  F02M19/00 ,  Y10S261/68

    摘要： A fuel metering system for a combustion engine carburetor utilizes a non-convoluted, planar, flexible diaphragm which does not require a molding process to form a traditional convolution. The diaphragm defines in part a pressure controlled fuel metering chamber on one side and a reference chamber at atmospheric pressure on the other side. During operation of the engine, sub-atmospheric pressure within a fuel and air mixing passage draws fuel from the metering chamber to mix with air for combustion within the engine. As pressure within the metering chamber thus decreases, the diaphragm flexes into metering chamber. The displacement of the diaphragm actuates a flow control valve of the metering system which flows pressurized make-up fuel into the metering chamber until the diaphragm returns to its datum position. Preferably, hardware of the flow control valve which is in direct contact with a surface of the diaphragm exposed to the metering chamber does not penetrate the diaphragm as the traditional rivet and washer assembly would. Therefore, manufacturing costs are reduced and any opportunity of leakage between the fuel metering chamber and reference chamber is eliminated. Preferably, the carburetor is of a manual external purge type in order to exert sufficient vacuum within the metering chamber to displace the metering diaphragm thus opening the flow control valve to purge the carburetor of unwanted fuel vapor and air prior to starting the engine. The novel planar diaphragm thereby resolves problems associated with traditional metering diaphragms such as variation in convolution datum height affecting flow control valve lever/diaphragm clearances, non-symmetric convolution axis or distorted convolution affecting diaphragm pressure response and recovery.

    摘要翻译： 用于内燃机化油器的燃料计量系统利用无卷曲的平面柔性隔膜，其不需要模制工艺来形成传统的卷绕。 隔膜部分地在一侧限定压力控制的燃料计量室，在另一侧限定在大气压力下的参考室。 在发动机运行期间，燃料和空气混合通道内的低于大气压的压力从计量室吸取燃料以与空气混合以在发动机内燃烧。 随着计量室内的压力因此减小，膜片弯曲进入计量室。 隔膜的位移启动计量系统的流量控制阀，使流量增加的补充燃料流入计量室，直到隔膜返回到其基准位置。 优选地，流量控制阀的与暴露于计量腔室的隔膜的表面直接接触的硬件不像传统的铆钉和垫圈组件那样穿透隔膜。 因此，制造成本降低并且燃料计量室和参考室之间的任何泄漏机会被消除。 优选地，化油器为手动外部净化类型，以便在计量室内施加足够的真空以移动计量膜片，从而打开流量控制阀以在起动发动机之前清除化油器中不想要的燃料蒸气和空气。 从而解决了与传统计量膜片相关的问题，例如影响流量控制阀杆/膜片间隙的卷积基准高度的变化，不对称卷积轴或扭曲卷积，影响膜片压力响应和恢复。

    Carburetor for a two-cycle scavenging engine
    9.
    发明公开
    Carburetor for a two-cycle scavenging engine 审中-公开
    Vergaserfüreinen Zweitaktmotor mitSpülung

    公开(公告)号：EP1367242A2

    公开(公告)日：2003-12-03

    申请号：EP03011237.9

    申请日：2003-05-16

    申请人： Walbro Engine Management, L.L.C.

    发明人： Braun, Matthew A. ,  Burns, Gary J. ,  Endo, Masatoshi

    IPC分类号： F02D9/10 ,  F02M17/04

    CPC分类号： F02M17/04 ,  F02D9/106 ,  Y10S261/01

    摘要： A carburetor for a scavenged two-stroke internal combustion engine has an enriched fuel-and-air mixing passage (26) extending through a housing of the carburetor (10). Engaged to the housing is a body of an air flow modular assembly (12) which carries a primary air flow passage (18) which houses a butterfly-type control valve (16) therein. The throttle valve (32) of the fuel-and-air mixing passage is mechanically linked or cammed to the control valve of the air flow passage so that opening of the throttle valve soon after opens the control valve allowing additional air to enter and provide a leaner fuel-and-air ratio in the combustion chamber of the engine when running under load. The air flow modular assembly has a sealing-and-bearing assembly (50) which eliminates air leakage from the surrounding environment along the shaft (34) of the control valve and into the primary air flow passage. The sealing-and-bearing assembly has a bushing (62,64) which inserts into a counter bore (56,58) of a cylindrical bore (52) which receives the rotating shaft of the control valve. The bushing is thereby disposed radially and sealingly between the shaft and the body of the modular assembly to journal the shaft and prevent air leakage. To prevent air bypass leakage around the plate of the control valve within the air flow passage, the bushing and respective counter bore do not extend all the way through the body and into the air passage, instead, a cylindrical sealing surface which in-part defines the cylindrical bore, sealingly engages the shaft axially between the counter bore and the air flow passage. In this way, the plate (36) and body interface at the location of the rotating shaft can more exactly follow the contour of the air flow passage, thereby preventing unwanted bypass air flow when the control valve is closed.

    摘要翻译： 用于清扫的二冲程内燃机的化油器具有延伸穿过化油器（10）的外壳的富集的燃料和空气混合通道（26）。 接合到壳体的是气流模块化组件（12）的主体，其携带在其中容纳蝶形控制阀（16）的主要空气流动通道（18）。 燃料和空气混合通道的节流阀（32）机械地连接或凸轮到空气流动通道的控制阀，使得在打开控制阀之后立即打开节流阀，允许额外的空气进入并提供 发动机燃烧室在负载下运行时燃油空气比较小。 空气流量模块化组件具有密封和轴承组件（50），其消除了沿着控制阀的轴（34）的周围环境的空气泄漏并进入一次空气流动通道。 密封和轴承组件具有插入到容纳控制阀的旋转轴的圆柱形孔（52）的反向孔（56,58）中的衬套（62,64）。 因此衬套径向地和密封地设置在轴和模块化组件的主体之间以使轴颈轴颈并防止空气泄漏。 为了防止在空气流动通道内的控制阀板周围的空气旁路泄漏，衬套和相应的反向孔不会一直延伸穿过主体并进入空气通道，而是一个圆柱形的密封表面， 圆柱形孔在轴向上密封地接合在反向孔和空气流动通道之间。 以这种方式，在旋转轴的位置处的板（36）和主体界面可以更精确地跟随空气流动通道的轮廓，从而当控制阀关闭时防止不必要的旁路气流。

    Injection port for internal combustion engine
    10.
    发明公开
    Injection port for internal combustion engine 有权
    Ansaugkanalfüreine Brennkraftmaschine

    公开(公告)号：EP1288462A2

    公开(公告)日：2003-03-05

    申请号：EP02255939.7

    申请日：2002-08-27

    申请人： TechTronic Industries Co., Ltd.

    发明人： Aljabari, Samer

    IPC分类号： F02B25/14

    CPC分类号： F02M1/16 ,  F02B25/14 ,  F02B63/02 ,  F02B2075/025 ,  F02F1/22 ,  F02M17/04

    摘要： An internal combustion engine having a cylinder with a piston movement area; a piston movably mounted in the cylinder; an ignition system connected to the cylinder; and a fuel delivery system connected to the cylinder. The fuel delivery system has a combined fuel and air injection port extending into the cylinder. The injection port has an end at the piston movement area with a top surface and a different shaped bottom. The bottom surface has an inwardly tapering shape to form a bottom portion of the end of the injection port with a generally semi-conical shape.

    摘要翻译： 一种具有活塞运动区域的气缸的内燃机; 活塞可移动地安装在气缸中; 连接到气缸的点火系统; 以及连接到气缸的燃料输送系统。 燃料输送系统具有延伸到气缸中的组合的燃料和空气喷射端口。 注射口在活塞运动区域具有一顶端，顶端表面和不同形状的底部。 底表面具有向内渐缩的形状，以形成具有大致半圆锥形形状的注射口端部的底部。