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1. 发明授权

US06508224B2 Handheld type four-cycle engine 有权
标题翻译：手持式四冲程发动机
公开(公告)号：US06508224B2
公开(公告)日：2003-01-21
申请号：US09803663
申请日：2001-03-12
申请人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
发明人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
IPC分类号： F01M100
CPC分类号： F02B75/16 , F01L1/024 , F01L1/182 , F01M1/04 , F01M9/06 , F01M11/065 , F01M13/04 , F02B63/02 , F02B67/06 , F02B2075/027 , F02B2275/20 , F02F1/002
摘要： In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.
摘要翻译：在手持式四冲程发动机中，阀操作机构包括可旋转地支撑在气缸盖中的凸轮轴，以便打开和关闭进气门和排气门以及定位传动装置，其位于发动机主体的外侧并提供曲轴和凸轮轴之间的关联以及用于动力输出的离心式离合器安装在发动机主体外侧的曲轴上。定时传动和位于曲轴两端的离心式离合器提高了重量平衡，发动机的重心可尽可能地靠近曲轴的中心部分，同时减重，可以提高发动机的可操作性。

2. 发明授权

US06705263B2 Handheld type four-cycle engine 有权
公开(公告)号：US06705263B2
公开(公告)日：2004-03-16
申请号：US10315040
申请日：2002-12-10
申请人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
发明人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
IPC分类号： F01M100
CPC分类号： F02B75/16 , F01L1/024 , F01L1/182 , F01M1/04 , F01M9/06 , F01M11/065 , F01M13/04 , F02B63/02 , F02B67/06 , F02B2075/027 , F02B2275/20 , F02F1/002
摘要： In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.

3. 发明授权

US06672273B2 Handheld type four-cycle engine 有权
标题翻译：手持式四冲程发动机
公开(公告)号：US06672273B2
公开(公告)日：2004-01-06
申请号：US10315185
申请日：2002-12-10
申请人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
发明人： Keita Ito , Koji Kasai , Takao Nishida , Yasuhiro Shimizu , Takeshi Maeda , Yasutake Ryu
IPC分类号： F01M100
CPC分类号： F02B75/16 , F01L1/024 , F01L1/182 , F01M1/04 , F01M9/06 , F01M11/065 , F01M13/04 , F02B63/02 , F02B67/06 , F02B2075/027 , F02B2275/20 , F02F1/002
摘要： In a handheld type four-cycle engine, a valve operation mechanism includes a camshaft rotatably supported in a cylinder head so as to open and close an intake valve and an exhaust valve and a timing transmission placed on one side outside an engine main body and providing association between a crankshaft and the camshaft, and a centrifugal clutch for power output is mounted on the crankshaft on the opposite side outside the engine main body. The timing transmission and the centrifugal clutch being positioned at the two ends of the crankshaft improves the weight balance, the centre of gravity of the engine can be made as close to the central part of the crankshaft as possible, which, together with the reduced weight, can enhance the operability of the engine.
摘要翻译：在手持式四冲程发动机中，阀操作机构包括可旋转地支撑在气缸盖中的凸轮轴，以便打开和关闭进气门和排气门以及定位传动装置，其位于发动机主体的外侧并提供曲轴和凸轮轴之间的关联以及用于动力输出的离心式离合器安装在发动机主体外侧的曲轴上。定时传动和位于曲轴两端的离心式离合器提高了重量平衡，发动机的重心可尽可能地靠近曲轴的中心部分，同时减重，可以提高发动机的可操作性。

4. 发明授权

US06561154B2 Engine head cover structure 有权
公开(公告)号：US06561154B2
公开(公告)日：2003-05-13
申请号：US09984167
申请日：2001-10-29
申请人： Keita Ito , Takeshi Maeda , Yasutake Ryu , Takao Nishida
发明人： Keita Ito , Takeshi Maeda , Yasutake Ryu , Takao Nishida
IPC分类号： F01M304
CPC分类号： F01L1/18 , F01L1/02 , F01L1/024 , F01L1/053 , F01M2013/0488 , F02B63/02 , F02B2075/027 , F02B2275/20 , F02F1/002 , F02F7/006
摘要： An engine head cover structure has a head cover joined to the upper end of a cylinder head so as to define a valve operation chamber therebetween. The head cover includes therein an oil recovery chamber to which oil resided in the valve operation chamber is recovered by suction and a breather chamber that removes blowby gas from the valve operation chamber being provided in the head cover. The breather chamber is defined between a partition plate mounted on an inner wall of the head cover via clips and a surface of the roof of the head cover, and the oil recovery chamber is defined between the partition plate and a partition body welded thereto. It is thus possible to form the oil recovery chamber and the breather chamber without splitting the roof of the head cover, thereby making inspection of the joint for oil tightness unnecessary.

5. 发明授权

US06250273B1 4-cycle engine 有权
标题翻译： 4冲程发动机
公开(公告)号：US06250273B1
公开(公告)日：2001-06-26
申请号：US09357772
申请日：1999-07-21
申请人： Yasutake Ryu , Takao Nishida , Keita Ito
发明人： Yasutake Ryu , Takao Nishida , Keita Ito
IPC分类号： F01L102
CPC分类号： F01L1/02 , F01L1/024 , F01L1/047 , F01L1/146 , F01L1/18 , F02B75/16 , F02B2075/027 , F02B2275/34 , F02F1/002
摘要： A crankcase includes first and second case halves which are coupled to each other at a parting plane extending to obliquely intersect the axis of first and second bearing portions. A cylinder barrel and the first bearing portion are formed by molding integrally on the first case half to form an engine block. The second bearing portion is formed by molding integrally on the second case half and a side cover is coupled to an outer side surface of the engine block to define a valve operating chamber for accommodation of a valve operating mechanism. Thus, the distance between the first and second bearing portions for supporting opposite ends of a crankshaft can be reduced without being interfered by the valve operating mechanism, thereby enhancing the durability of the crankshaft. The valve operating mechanism can be assembled after coupling of the first and second case halves forming the crankcase, whereby the assemblability of the valve operating mechanism can be improved.
摘要翻译：曲轴箱包括第一和第二壳体半部，它们在与第一和第二轴承部分的轴线倾斜相交的分型平面处彼此联接。气缸筒和第一轴承部分通过一体地模制在第一壳体半部上以形成发动机缸体而形成。第二轴承部分通过一体地模制在第二壳体半部上并且侧盖联接到发动机缸体的外侧表面以形成用于容纳阀操作机构的气门操作室。因此，可以减小用于支撑曲轴的相对端的第一和第二轴承部分之间的距离，而不受阀操作机构的干扰，从而提高曲轴的耐久性。在形成曲轴箱的第一和第二半壳体的联接之后，可以组装阀操作机构，从而可以提高阀操作机构的组装性。

6. 发明授权

US06539904B2 Valve-operating mechanism in 4-cycle engine 有权
公开(公告)号：US06539904B2
公开(公告)日：2003-04-01
申请号：US09946956
申请日：2001-09-06
申请人： Keita Ito , Takao Nishida , Takeshi Maeda , Yasuhiro Shimizu
发明人： Keita Ito , Takao Nishida , Takeshi Maeda , Yasuhiro Shimizu
IPC分类号： F01L102
CPC分类号： F01L1/053 , F01L1/02 , F01L1/024 , F01L1/18 , F02B63/02 , F02B2075/027
摘要： In a valve-operating mechanism in a 4-cycle engine, a timing transmitting device is disposed on one side of an engine body. A cam device includes a cam coupled to a driven pulley of the timing transmitting device on one side of a cylinder head, intake and exhaust rocker shafts rotatably carried in the cylinder head, intake and exhaust cam followers secured to one ends of the rocker shafts with their tip ends in sliding contact with the cam, and intake and exhaust rocker arms secured to the other ends of the intake and exhaust rocker shafts with their tip ends abutting against the intake and exhaust valves. Thus, the cam of the cam device can be disposed on one side of the cylinder head to effectively reduce the entire height of the engine.

7. 发明授权

US06592059B2 Foreign matter entanglement-preventing device in working engine 有权
公开(公告)号：US06592059B2
公开(公告)日：2003-07-15
申请号：US09949835
申请日：2001-09-12
申请人： Keita Ito , Takao Nishida , Takeshi Maeda , Kenji Higashi
发明人： Keita Ito , Takao Nishida , Takeshi Maeda , Kenji Higashi
IPC分类号： B02C1900
CPC分类号： F01P5/02 , F01P1/02 , F01P11/12 , F02B63/02 , F02B2075/027
摘要： In a working engine including a bearing mounted on an outer wall of a crankcase for carrying a crankshaft, an oil seal mounted on the outer wall of a crankcase and disposed outside and adjacent the bearing, and a cooling fan which is attached to an outer end of the crankshaft adjacent the oil seal with its blades turned toward the crankcase and which has blades protruding toward the crankcase, a cylindrical protective tube is formed on an outer sidewall of the crankcase to cover ends of bosses of the cooling fan, and a foreign matter-beating piece is formed on the cooling fan 16 in proximity to an outer peripheral surface of the protective tube. Thus, even if a long foreign matter drawn in by the cooling fan such as a weed and the like has been entangled around the crankshaft, it can be beaten and loosened, or cut by the foreign matter-beating piece rotated along with the cooling fan. Therefore, it is possible to prevent the entanglement around the foreign matter around the crankshaft, thereby avoiding damage to the oil seal as a result of the entanglement.

8. 发明授权

US06484679B2 Engine valve operation mechanism 失效
公开(公告)号：US06484679B2
公开(公告)日：2002-11-26
申请号：US09984156
申请日：2001-10-29
申请人： Keita Ito , Takeshi Maeda , Takao Nishida
发明人： Keita Ito , Takeshi Maeda , Takao Nishida
IPC分类号： F01L1053
CPC分类号： F02B63/02 , F01L1/02 , F01L1/024 , F01L1/053 , F01L1/18 , F02B75/16 , F02B2075/027 , F02B2275/20 , F02F1/002
摘要： In an engine valve operation mechanism, opposite ends of a support shaft that supports a cam in a rotatable manner are supported in a first support hole of a first support wall formed in a cylinder head and a second support hole of a second support wall placed inwardly from the first support wall relative to the cylinder head, thereby allowing the support shaft to be inserted into the first support hole and the second support hole from outside the cylinder head, and an inner face of a head cover prevents the support shaft from becoming detached from the first support hole. The axial movement of the cam support shaft can thereby be restricted without employing a special stopper member, and the leakage of lubricating oil for the support shaft can be prevented without using a special sealing member.

9. 发明授权

US06725820B2 Valve-operating mechanism in engine 有权
标题翻译：发动机阀门操作机构
公开(公告)号：US06725820B2
公开(公告)日：2004-04-27
申请号：US10218174
申请日：2002-08-14
申请人： Keita Ito , Yasutake Ryu , Tetsuya Arai
发明人： Keita Ito , Yasutake Ryu , Tetsuya Arai
IPC分类号： F01L310
CPC分类号： F01L1/185 , F01L1/024 , F01L1/053 , F01L1/462 , F01L2001/0535 , F01L2101/00
摘要： A valve-operating mechanism includes cam followers carried on an engine body 1 with their tip ends being in sliding contact with the cam, rocker arms integrally connected to the cam followers and carried on the engine body coaxially with said cam followers with their tip ends being connected to valves, and valve springs for biasing the valves in closing directions. In the valve-operating mechanism, auxiliary springs are connected to the cam followers for biasing and turning the cam followers in the same directions as directions in which the valve springs bias and turn the rocker arms through the valves. Thus, a couple of forces generated over the axis of the cam follower and the rocker arm due to biasing force of the valve spring can be offset in a valve-closing process.
摘要翻译：一种阀门操作机构包括：承载在发动机主体1上的凸轮从动件，其末端与凸轮滑动接触，摇臂与凸轮从动件一体地连接，并与其凸起从动件同轴地承载在发动机本体上，连接到阀门，以及阀门弹簧，用于沿关闭方向偏压阀门。在阀门操作机构中，辅助弹簧连接到凸轮从动件，用于沿着与弹簧偏压的方向相同的方向偏压和转动凸轮从动件，并使摇臂通过阀。因此，由于阀弹簧的偏压力而在凸轮从动件和摇臂的轴线上产生的一对力可以在阀关闭过程中偏移。

10. 发明授权

US06422194B2 Handheld type four-cycle engine 失效
标题翻译：手持式四冲程发动机
公开(公告)号：US06422194B2
公开(公告)日：2002-07-23
申请号：US09801924
申请日：2001-03-09
申请人： Keita Ito , Takao Nishida , Sei Watanabe
发明人： Keita Ito , Takao Nishida , Sei Watanabe
IPC分类号： F01M910
CPC分类号： F02B63/02 , F01M1/04 , F01M9/06 , F01M11/065 , F02B67/06 , F02B75/16 , F02B2075/027 , F02B2275/22 , F02B2275/30 , F02B2275/34 , F02F1/002 , F02F1/06 , F02F1/305
摘要： With regard to a handheld type four-cycle engine including, in a side wall of a cylinder block, an intake valve, an exhaust valve and a valve operation mechanism operable in association with a crankshaft so as to open and close the above-mentioned valves and, an oil tank is formed in one side wall of the cylinder block, and the oil tank houses the valve operation mechanism and oil mist generation means for generating an oil mist from stored oil. It is thus possible to reliably lubricate the valve operation mechanism regardless of the operational position of the engine while allowing the size and weight of the engine main body to be reduced.
摘要翻译：关于手持式四冲程发动机，其包括在气缸体的侧壁中的进气阀，排气阀和与曲轴相关联的可操作的阀操作机构，以便打开和关闭上述阀并且在油缸体的一个侧壁上形成油箱，油箱容纳用于从存储的油产生油雾的阀操作机构和油雾产生装置。因此，无论发动机的工作位置如何，能够可靠地润滑阀操作机构，同时能够减小发动机主体的尺寸和重量。

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