公开(公告)号：US06508224B2

公开(公告)日：2003-01-21

申请号：US09803663

申请日：2001-03-12

Applicant: Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

Inventor： Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

IPC: F01M100

CPC classification number: F02B75/16 ,  F01L1/024 ,  F01L1/182 ,  F01M1/04 ,  F01M9/06 ,  F01M11/065 ,  F01M13/04 ,  F02B63/02 ,  F02B67/06 ,  F02B2075/027 ,  F02B2275/20 ,  F02F1/002

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US06539904B2

公开(公告)日：2003-04-01

申请号：US09946956

申请日：2001-09-06

Applicant: Keita Ito ,  Takao Nishida ,  Takeshi Maeda ,  Yasuhiro Shimizu

Inventor： Keita Ito ,  Takao Nishida ,  Takeshi Maeda ,  Yasuhiro Shimizu

IPC: F01L102

CPC classification number: F01L1/053 ,  F01L1/02 ,  F01L1/024 ,  F01L1/18 ,  F02B63/02 ,  F02B2075/027

Abstract: 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.

公开(公告)号：US06705263B2

公开(公告)日：2004-03-16

申请号：US10315040

申请日：2002-12-10

Applicant: Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

Inventor： Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

IPC: F01M100

CPC classification number: F02B75/16 ,  F01L1/024 ,  F01L1/182 ,  F01M1/04 ,  F01M9/06 ,  F01M11/065 ,  F01M13/04 ,  F02B63/02 ,  F02B67/06 ,  F02B2075/027 ,  F02B2275/20 ,  F02F1/002

Abstract: 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.

公开(公告)号：US06672273B2

公开(公告)日：2004-01-06

申请号：US10315185

申请日：2002-12-10

Applicant: Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

Inventor： Keita Ito ,  Koji Kasai ,  Takao Nishida ,  Yasuhiro Shimizu ,  Takeshi Maeda ,  Yasutake Ryu

IPC: F01M100

CPC classification number: F02B75/16 ,  F01L1/024 ,  F01L1/182 ,  F01M1/04 ,  F01M9/06 ,  F01M11/065 ,  F01M13/04 ,  F02B63/02 ,  F02B67/06 ,  F02B2075/027 ,  F02B2275/20 ,  F02F1/002

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US06592059B2

公开(公告)日：2003-07-15

申请号：US09949835

申请日：2001-09-12

Applicant: Keita Ito ,  Takao Nishida ,  Takeshi Maeda ,  Kenji Higashi

Inventor： Keita Ito ,  Takao Nishida ,  Takeshi Maeda ,  Kenji Higashi

IPC: B02C1900

CPC classification number: F01P5/02 ,  F01P1/02 ,  F01P11/12 ,  F02B63/02 ,  F02B2075/027

Abstract: 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.

公开(公告)号：US06561154B2

公开(公告)日：2003-05-13

申请号：US09984167

申请日：2001-10-29

Applicant: Keita Ito ,  Takeshi Maeda ,  Yasutake Ryu ,  Takao Nishida

Inventor： Keita Ito ,  Takeshi Maeda ,  Yasutake Ryu ,  Takao Nishida

IPC: F01M304

CPC classification number: F01L1/18 ,  F01L1/02 ,  F01L1/024 ,  F01L1/053 ,  F01M2013/0488 ,  F02B63/02 ,  F02B2075/027 ,  F02B2275/20 ,  F02F1/002 ,  F02F7/006

Abstract: 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.

公开(公告)号：US06484679B2

公开(公告)日：2002-11-26

申请号：US09984156

申请日：2001-10-29

Applicant: Keita Ito ,  Takeshi Maeda ,  Takao Nishida

Inventor： Keita Ito ,  Takeshi Maeda ,  Takao Nishida

IPC: F01L1053

CPC classification number: F02B63/02 ,  F01L1/02 ,  F01L1/024 ,  F01L1/053 ,  F01L1/18 ,  F02B75/16 ,  F02B2075/027 ,  F02B2275/20 ,  F02F1/002

Abstract: 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.

公开(公告)号：US06422194B2

公开(公告)日：2002-07-23

申请号：US09801924

申请日：2001-03-09

Applicant: Keita Ito ,  Takao Nishida ,  Sei Watanabe

Inventor： Keita Ito ,  Takao Nishida ,  Sei Watanabe

IPC: F01M910

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US06547254B2

公开(公告)日：2003-04-15

申请号：US09898447

申请日：2001-07-05

Applicant: Keita Ito ,  Takao Nishida ,  Tetsuya Arai ,  Shigeki Edamatsu

Inventor： Keita Ito ,  Takao Nishida ,  Tetsuya Arai ,  Shigeki Edamatsu

IPC: F02F1100

CPC classification number: F02F1/002 ,  F02B63/02 ,  F02B2075/027 ,  F02B2275/20 ,  F02F11/002 ,  Y10S277/91

Abstract: A seal structure in an engine, including a seal member interposed between a cylinder head having a slanting face portion at least at an intermediate portion of its upper end face to which a valve-operating cam chamber opens, and a head cover coupled to the upper end face of the cylinder head by a bolt to close the valve-operating cam chamber. The head cover has a fit wall portion formed thereon and fitted to an inner peripheral surface of the valve-operating cam chamber, and the seal member is mounted in a seal groove provided in an outer peripheral surface of the fit wall portion to come into close contact with an inner peripheral surface of the cylinder head. Thus, an interference can be provided equally at various portions of the seal member irrespective of the number of bolts used, and the seal member can always exhibit a good seal function.

Abstract translation: 一种发动机中的密封结构，包括密封构件，该密封构件设置在具有倾斜面部的气缸盖之间，所述气缸盖的上端面的至少一个中间部分与阀操作凸轮室打开;以及头盖， 气缸盖的端面通过螺栓封闭气门操作凸轮室。 头罩具有形成在其上的配合壁部，并且嵌合在气门操作凸轮室的内周面上，密封部件安装在设置在配合壁部的外周面的密封槽内，使其闭合 与气缸盖的内周面接触。 因此，与密封件的数量无关地可以在密封件的各个部分上均匀地设置干涉，并且密封件总是能表现出良好的密封功能。

公开(公告)号：US06505596B2

公开(公告)日：2003-01-14

申请号：US09798038

申请日：2001-03-05

Applicant: Keita Ito ,  Takao Nishida

Inventor： Keita Ito ,  Takao Nishida

IPC: F01M100

CPC classification number: F02B67/06 ,  F01M1/04 ,  F01M9/06 ,  F01M11/065 ,  F02B63/02 ,  F02B2075/027 ,  F02B2275/20

Abstract: In a handheld type four-cycle engine, the lubricating system includes an oil tank placed outside an engine main body, a through hole providing communication between the oil tank and a crank chamber, an oil feed pipe placed outside the engine main body and providing communication between the crank chamber and a valve operation chamber of a cylinder head, an oil return pipe placed outside the engine main body and providing communication between the valve operation chamber and the oil tank, and a one-way valve for transferring oil from the crank chamber to the valve operation chamber side via the oil feed pipe. The side walls of the engine main body can thus be made thinner and the weight of the engine main body can therefore be reduced regardless of the presence of the oil feed pipe and the oil return pipe.

Abstract translation: 在手持式四冲程发动机中，润滑系统包括放置在发动机主体外部的油箱，在油箱和曲轴室之间提供连通的通孔，设置在发动机主体外部的供油管， 在曲轴室和气缸盖的气门操作室之间，设置在发动机主体外部并且提供阀操作室和油箱之间的连通的回油管，以及用于从曲柄室输送油的单向阀 通过供油管连接到阀操作室侧。 因此，不管供油管和回油管是否存在，发动机主体的侧壁能够变得更薄，因此能够减小发动机主体的重量。