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    • 2. 发明专利
    • BRPI1003517A2
    • 2013-01-29
    • BRPI1003517
    • 2010-09-15
    • MAKITA CORP
    • SUGIYAMA MASAKITOMITA TOSHIHIROKURIMOTO MASAKIKUBOTA HIROSHI
    • F01M1/04
    • A lubrication system (30) for a four-stroke engine (100) configured to lubricate components in a crank chamber (105a) and in a valve-operating chamber (130) with oil (A) by supplying the oil (A). The lubrication system has an oil feeding passage (154) including a suction part (155), the suction part (155) being positioned so as to stay below a surface of the oil (A) even when the oil reservoir (107) is tilted with the oil stored therein in an amount within a rated range and a position of the surface of the oil (A) is thereby changed, the oil feeding passage (154) is configured such that, when a negative pressure is created in the crank chamber (105a), the oil reservoir (107) and the crank chamber (105a) are in communication with each other through the oil feeding passage (154) so that the oil (A) in the oil reservoir (107) is sucked through the suction part (155) and is delivered to the crank chamber (105a), wherein the oil feeding passage (154) has an opening end opened in the crank chamber (105a), the opening end being positioned so as to establish communication with the crank chamber (105a) when the piston (113) moves from a position near a top dead center toward the top dead center; and a direct passage (147) having a plurality of openings that are spaced apart from each other, are opened in the valve-operating chamber (130) at one ends and are opened in the crank chambers (105a) at the other ends, so as to communicate the valve-operating chamber (130) with the crank chamber (105a) when a negative pressure is created in the crank chamber (105a), wherein the opening end of the direct passage (147) opened in the crank chamber (105a) is positioned so as to establish communication with the crank chamber (105a) when the piston (113) moves from a position near the top dead center toward the top dead center; and wherein the oil (A) in the valve-operating chamber (130) is delivered to the crank chamber (105a) through the direct passage (147) when a negative pressure is created in the crank chamber (105a).
    • 3. 发明专利
    • BRPI1003591A2
    • 2013-01-08
    • BRPI1003591
    • 2010-09-16
    • MAKITA CORP
    • SUGIYAMA MASAKITOMITA TOSHIHIROKURIMOTO MASAKIKUBOTA HIROSHI
    • A lubrication system (70) for a portable four-stroke engine (1) includes an opening end (36a) of the breather passage(36) is disposed at substantially a center of a valve-operating chamber (30), and the valve-operating chamber (30) is formed by attaching a valve-operating chamber cover (31). An inner cover (40) is attached to an inner surface of the valve-operating chamber cover (31) so as to be provided along and in contact with the inner surface of the valve-operating chamber cover (31). A suction passage (45) is formed as a gap between the circumferential edge of the top plate portion and the inner cover (40). Three or more suction tubes (46) that are in communication with the suction passage (45) are provided in the inner cover (40), each of the suction tubes (46) having an opening end (46b). At least one of the opening ends (46b) of the suction tubes (46) is provided lower than the opening end (36a) of the breather passage (36) in an attitude of the engine (1) during use.
    • 8. 发明专利
    • Engine
    • 发动机
    • JP2012167592A
    • 2012-09-06
    • JP2011028702
    • 2011-02-14
    • Makita Corp株式会社マキタ
    • SUGIYAMA MASAKIHASEGAWA TETSUYA
    • F02M37/12
    • F02M37/046F02M5/125F02M37/12F02M37/14
    • PROBLEM TO BE SOLVED: To provide an engine capable of providing a sufficient pressure variation for driving a diaphragm type fuel pump, and without intruding oil into a diaphragm chamber.SOLUTION: This four-stroke engine 1 includes a crankcase 7, and a carburetor 25 capable of adjusting quantity of an air-fuel mixture of mixing fuel and air supplied to the crankcase 7. The carburetor 25 has the diaphragm type fuel pump 109, and the diaphragm type fuel pump 109 has a pump room 1108 for sucking and delivering the fuel, and the diaphragm chamber 110 for supplying pressure for driving the pump room 1108, and only negative pressure of the crankcase 7 is supplied to the diaphragm chamber 110.
    • 要解决的问题:提供能够提供足够的压力变化以驱动隔膜式燃料泵的发动机,并且不会将油侵入隔膜室。 解决方案:该四冲程发动机1包括曲轴箱7和能够调节供应到曲轴箱7的燃料和空气混合的空气燃料混合物的量的化油器25.化油器25具有隔膜式燃料泵 109,隔膜式燃料泵109具有用于吸入和输送燃料的泵室1108和用于提供用于驱动泵室1108的压力的隔膜室110,并且只有曲轴箱7的负压被供应到隔膜室 (C)2012年,JPO&INPIT
    • 9. 发明专利
    • Lubrication structure of four-cycle engine
    • 四轮发动机润滑结构
    • JP2012057554A
    • 2012-03-22
    • JP2010202285
    • 2010-09-09
    • Makita Corp株式会社マキタ
    • SUGIYAMA MASAKIHASEGAWA TETSUYA
    • F01M1/04F01M9/06F01M11/02F01M13/00
    • F01M1/04F01M11/065F01M13/025F16N7/32
    • PROBLEM TO BE SOLVED: To prevent oil from being consumed in a short period of time by lubricating the oil amount suitable for a crank chamber having a crankshaft and a valve operating mechanism, respectively.SOLUTION: The lubrication structure of a four-cycle engine is provided for lubricating the driving parts by supplying the oil stored in an oil using pressure fluctuation in the crank chamber. The lubrication structure includes a first circulating passage for supplying oil from the oil tank to the crank chamber and for returning the oil misted in the crank chamber to the oil tank, and a second circulating passage for supplying misted oil from the oil tank to the valve operating mechanism chamber and for returning the same to the oil tank. The crank chamber and the oil tank are partitioned by the partition 11, the center 20 of the partition 11 is arranged vertically above the oil level of the oil stored in the oil tank even though the engine body is inclined, and the opening A1 of the side for supplying the misted oil of the second circulating passage is arranged in the center 20.
    • 要解决的问题:通过分别润滑适用于具有曲轴的曲柄室和阀操作机构的油量来防止油在短时间内被消耗。 解决方案:四冲程发动机的润滑结构用于通过在曲柄室中使用压力波动来供给储存在油中的油来润滑驱动部件。 润滑结构包括:第一循环通道,用于将油从油箱供给到曲柄室,并将曲柄室内的油返回到油箱;以及第二循环通道,用于将油从油箱向阀提供 操作机构室并将其返回到油箱。 曲轴室和油箱由隔板11隔开,即使发动机主体倾斜,分隔件11的中心20也垂直设置在储存在油箱中的油的油面上方, 供应第二循环通道的雾油的一侧设置在中心部分20.版权所有(C)2012,JPO&INPIT
    • 10. 发明专利
    • Lubricating device for four-stroke engine
    • 四冲程发动机润滑装置
    • JP2012026347A
    • 2012-02-09
    • JP2010165264
    • 2010-07-22
    • Makita Corp株式会社マキタ
    • SUGIYAMA MASAKIHASEGAWA TETSUYA
    • F01M1/06F01M1/04F01M13/00F01M13/04
    • F01M1/04F01M11/065F01M13/022F01M13/028F16N7/32
    • PROBLEM TO BE SOLVED: To provide a lubricating device for a four-stroke engine forming a valve operating chamber compactly, and particularly including a passageway recovering oil with a structure improving recovering efficiency for oil that collects inside the valve operating chamber even in the four-stroke engine in which a cylinder head and a cylinder block are formed separately and suitable for manufacturing.SOLUTION: The lubricating device for a four-stroke engine 10 is configured to circulate the oil while lubricating each part in the valve operating chamber 30 and a crank chamber 13a by supplying the oil thereto utilizing pressure fluctuation in the crank chamber 13a, the pressure fluctuation being caused by reciprocating motion of a piston 11. The valve operating chamber 30 is formed by mounting a valve operating chamber cover 100, and a suction passageway 110 sucking the oil in the valve operating chamber 30 is provided by forming a groove 111 on an inner surface of the valve operating chamber cover 100 and sealing the groove 111 with a sealing member 130 shaped to fit the groove 111.
    • 要解决的问题:为了提供一种紧凑地形成气门操作室的四冲程发动机的润滑装置,特别是包括具有提高收集在气门操作室内的油的回收效率的结构的通道回收油,即使在 其中气缸盖和气缸体分别形成并适于制造的四冲程发动机。 解决方案:用于四冲程发动机10的润滑装置构造成使油循环,同时润滑阀操作室30中的每个部分和曲柄室13a,通过在曲轴室13a中施加压力波动来供给油, 压力波动是由活塞11的往复运动引起的。阀操作室30通过安装阀操作室盖100而形成,并且吸入阀操作室30中的油的抽吸通道110通过形成槽111 在阀操作室盖100的内表面上,并用形成为适合槽111的密封构件130密封槽111.版权所有(C)2012,JPO&INPIT