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公开(公告)号：US11781501B2
公开(公告)日：2023-10-10
申请号：US17785528
申请日：2021-03-08
Applicant: KUBOTA Corporation
Inventor： Akira Tamura , Kensuke Fujita , Hiroki Oso , Yasushi Kobayashi , Shingo Matsunobu , Mitsugu Okuda
CPC classification number: F02F1/242 , F02M55/025 , F02M2200/857
Abstract: To provide an engine head structure for “omission or shortening a fuel pipe that withstands a high pressure”, “simplification or omission of a support bracket for a fuel accumulator and/or a fuel injection device”, “reduction of the number of parts” by devising a fuel accumulator and a support structure therefor, and the like. An engine head structure has a support bracket for mounting a fuel accumulator including a joining portion with a fuel injection device on a cylinder head, is disposed on a side of the fuel injection device or between adjacent fuel injection devices. The support bracket includes a member having a mounting portion on which the fuel accumulator is placed and mounted, a mounting leg portion extending from the mounting portion and mounted on the cylinder head, and an aligning leg portion extending from the mounting portion for positioning the support bracket with respect to the cylinder head.
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公开(公告)号：US11378001B2
公开(公告)日：2022-07-05
申请号：US17282904
申请日：2019-09-09
Applicant: KUBOTA Corporation
Inventor： Hideyuki Koyama , Mitsugu Okuda , Yuji Shinohara , Mitsuru Kamiyama , Hiroki Oso
Abstract: An electronic fuel injection type diesel engine enables reduction in engine size. The electronic fuel injection type diesel engine is provided with: a combustion chamber inside a cylinder; a fuel injection chamber inside a cylinder head; a fuel injector that injects liquid fuel into the fuel injection chamber; a fuel accumulation unit that accumulates the liquid fuel injected from the fuel injector; and an electronic control unit that controls a timing and an amount of injection of the liquid fuel.
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公开(公告)号：US11371414B2
公开(公告)日：2022-06-28
申请号：US16857245
申请日：2020-04-24
Applicant: KUBOTA Corporation
Inventor： Hiroki Oso , Nobuyoshi Okada , Hideyuki Koyama , Yoshinori Tanaka , Kenji Okamoto
Abstract: Provided is an exhaust system for an engine in which a fastening force of a fastener hardly decreases. An exhaust system for an engine includes: an exhaust passage component of ferrous metal; and a fastener that fastens the exhaust passage component to other parts, the exhaust passage component including a pressure receiving surface that receives a fastening force of the fastener. The oxide film of triiron tetraoxide is formed on the pressure receiving surface of the exhaust passage component. It is preferable that the oxide film of triiron tetraoxide be also formed on an outer surface other than the pressure receiving surface of the exhaust passage component. It is preferable that the oxide film of triiron tetraoxide be also formed on an inner surface of the exhaust passage component.
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公开(公告)号：US10415443B2
公开(公告)日：2019-09-17
申请号：US15177444
申请日：2016-06-09
Applicant: KUBOTA Corporation
Inventor： Kentaro Nagai , Takahiro Yamazaki , Takahito Hamasaki , Hideyuki Goto , Hiroki Oso , Hideyuki Koyama , Akira Tanaka , Yoshinori Tanaka
Abstract: There is provided an engine capable of reducing oil consumption. The engine includes a cylinder head, a cylinder head cover mounted above the cylinder head, a rocker arm covered by the cylinder head cover, and a breather chamber provided inside the cylinder head cover. As a front-rear direction is defined by a longitudinal direction of the cylinder head cover, the breather chamber has a blow-by gas inlet at one side in the front-rear direction, a blow-by gas outlet at another side in the front-rear direction, and an oil discharging guide chamber at an intermediate part in the front-rear direction. The blow-by gas inlet is opened on a bottom wall of the breather chamber, and a peripheral wall of the oil discharging guide chamber is protruded downwardly from the bottom wall of the breather chamber toward between the rocker arm provided at a side of the blow-by gas outlet and the blow-by gas inlet.
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公开(公告)号：US10982576B2
公开(公告)日：2021-04-20
申请号：US16410280
申请日：2019-05-13
Applicant: KUBOTA Corporation
Inventor： Hiroki Oso , Akira Tanaka , Hideyuki Koyama , Rina Kaneko , Nobuyoshi Okada
Abstract: In an engine that includes a blow-by-gas returning system configured to direct blow-by gas within a crankcase to an intake system through an inside of a head cover, the intake system includes a cover intake-passage disposed at a blow-by-gas outlet of the head cover, and the cover intake-passage communicates with a blow-by-gas passage of the blow-by-gas outlet.
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Patent Agency Ranking
公开(公告)号：US10669903B2
公开(公告)日：2020-06-02
申请号：US15618226
申请日：2017-06-09
Applicant: KUBOTA Corporation
Inventor： Hiroki Oso , Hideyuki Koyama , Hideyuki Goto , Takahiro Yamazaki , Kentaro Nagai , Takashi Yamaguchi , Rina Kaneko
Abstract: An oil cooling structure of an engine is provided that is capable of enhancing cooling performance of oil while preventing an increase in number of components or an increase in required space from being involved as much as possible. In an oil cooling structure of an engine in which a transmission case is attached to one end wall of an engine body, and a transmission mechanism for an accessory drive is provided in the transmission case, the transmission case is formed into a potlid-shaped body having a plurality of rib walls along a front-rear direction, and is attached to an engine front wall with an engine cooling fan, and case inner chamber portions partitioned by the rib walls in the transmission case are configured as a transporting passage of oil circulated by an oil pump.
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公开(公告)号：US10815911B2
公开(公告)日：2020-10-27
申请号：US16205855
申请日：2018-11-30
Applicant: KUBOTA Corporation
Inventor： Akira Tanaka , Hiroki Oso , Yoshinori Tanaka , Hideyuki Koyama , Takahiro Yamazaki , Nobuyoshi Okada
Abstract: There is provided an engine stopping device including a stopping solenoid, where an operating shaft, interlocked to a control rack of a fuel injection pump, is rotatably supported by an engine case in a pass-through manner. The control rack is forcibly movable to a stopping position by an action of the stopping solenoid on an operation arm provided for a projecting portion of the operating shaft in an integrally rotatable manner. An extending-retracting rod of the stopping solenoid and the operation arm are interlocked by fitting engagement between a pin provided for the extending-retracting rod and a cut-out portion of the operation arm. The cut-out portion is configured in a shape elongated along a direction perpendicular to a movement trajectory of the extending-retracting rod.
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公开(公告)号：US10323675B2
公开(公告)日：2019-06-18
申请号：US15617084
申请日：2017-06-08
Applicant: KUBOTA Corporation
Inventor： Hiroki Oso , Naoya Sakurai , Takumi Fukuda , Mitsugu Okuda , Wataru Iwanaga , Yusuke Suzuki , Takahiro Kajihara
Abstract: A device with an adjustment bolt includes a bolt attachment wall, an adjustment bolt screwed with an internal thread hole of the bolt attachment wall, a locknut screwed with the adjustment bolt, a cover that surrounds the adjustment bolt and the locknut, and a stopper unit that prevents removal of the cover from the locknut. The stopper unit includes an inner circumference groove of the cover fitted around a C-shaped retaining ring, and an external circumference groove of the locknut fitting within the retaining ring. The external circumference groove includes a first groove portion having a large-diameter groove bottom that restricts contraction and removal of the retaining ring fitted within the inner circumference groove, and a second groove portion provided continuously for the first groove portion and having a small-diameter groove bottom that allows contraction and removal of the retaining ring fitted within the inner circumference groove.
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公开(公告)号：US12221936B2
公开(公告)日：2025-02-11
申请号：US18565224
申请日：2022-02-21
Applicant: KUBOTA CORPORATION
Inventor： Yasushi Kobayashi , Hiroki Oso , Kiichi Suehiro , Yuki Tagashira , Koji Nakakita
Abstract: A diesel engine 30 includes an injector 4 that uses a solenoid to directly drive a needle valve and inject a fuel and an injector control device 2 that controls the driving by the injector 4. The injector control device 2 includes a charge voltage control circuit 22, a storage unit 25 that stores a correction value related to an injection amount of the fuel injected from the injector 4, and an injector control circuit 24 that controls the driving by the injector 4 on the basis of each of a voltage supplied from the charge voltage control circuit 22 and the correction value stored in the storage unit 25. The correction value is set according to a voltage applied to a terminal of the injector control device 2 connected to a load when a current starts to flow in the load connected to the injector control device 2.
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公开(公告)号：US12085010B2
公开(公告)日：2024-09-10
申请号：US18266586
申请日：2021-10-25
Applicant: KUBOTA Corporation
Inventor： Hiroki Oso , Yuki Tagashira , Akira Tamura , Rina Kaneko , Kiichi Suehiro
CPC classification number: F02B19/18 , F01P1/10 , F02F11/002 , F02M61/14
Abstract: Provided is an electronic fuel injection type diesel engine capable of performing precise electronic fuel injection control. A fuel injector includes a main body portion having a large diameter, a nozzle portion having a small diameter, and a pressing surface formed at a step portion between the main body portion and the nozzle portion, in which the nozzle portion of the fuel injector is inserted from an inside of a sleeve into an inside of an insertion hole, the fuel injector is pressed toward a vortex chamber by a pressing force, and the pressing force applied to the fuel injector is received by a pressure receiving surface of the sleeve from the pressing surface of the fuel injector via the washer.
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