Kubota Corporation

Hiroki Oso

Hideyuki Koyama

Takahiro Yamazaki

Yoshinori Tanaka

Rina Kaneko

Kentaro Nagai

Hideyuki Goto

Akira Tanaka

Nobuyoshi Okada

Akira Tamura

Shingo Matsunobu

Kiichi Suehiro

Kenji Okamoto

Mitsugu Okuda

Yasushi Kobayashi

Takahito Hamasaki

Takashi Yamaguchi

Yusuke Suzuki

Wataru Iwanaga

Manabu Miyazaki

Tamotsu Kuno

Takahiro Kajihara

Naotaro Nagai

Koji Nakakita

Akihiko Kai

Mitsuru Kamiyama

Osamu Yoshii

Masanari Tennomi

Naoya Sakurai

Kentarou Kita

Kensuke Fujita

Yuuji Takemura

Tomoya Hasegawa

Wataru Miyauchi

Yuji Shinohara

Yuki Tagashira

Ayako Sakurai

Takumi Fukuda

An object of the present invention is to provide a fuel injection system capable of suppressing an occurrence of distortion in an injector during assembly of components. A fuel injection system () includes: a bracket () which is fixed to a cylinder head () of an engine (); a fuel accumulator () which is supported by and fixed to the bracket () and which accumulates pressure of fuel supplied from a fuel pump; and an injector () which is directly connected to the fuel accumulator () and mounted to the cylinder head () and which injects the fuel, supplied from the fuel accumulator (), into a combustion chamber. At least one of the fuel accumulator () and the bracket () has guide members () which guide the injector () to a mount position on the cylinder head ().

Fuel injection system

A diesel engineincludes an injectorthat uses a solenoid to directly drive a needle valve and inject a fuel and an injector control devicethat controls the driving by the injector. The injector control deviceincludes a charge voltage control circuit, a storage unitthat stores a correction value related to an injection amount of the fuel injected from the injector, and an injector control circuitthat controls the driving by the injectoron the basis of each of a voltage supplied from the charge voltage control circuitand the correction value stored in the storage unit. The correction value is set according to a voltage applied to a terminal of the injector control deviceconnected to a load when a current starts to flow in the load connected to the injector control device

Diesel engine, diesel engine manufacturing method, and diesel engine injection-amount correction system

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.

Electronic fuel injection type diesel engine

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', &#x201c;reduction of the number of parts&#x201d; 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.

Engine head structure

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.

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.

Exhaust system for engine

There is provided an engine equipped with a supercharger that suppresses heat deterioration of engine oil. The engine equipped with a supercharger includes a supercharger; an oil supply passage that supplies engine oil to a shaft bearing part of the supercharger; an oil discharge passage that discharges the engine oil from the shaft bearing part of the supercharger; and a water-cooling-type oil cooler. The water-cooling-type oil cooler is provided in the oil discharge passage, and the engine oil discharged from the shaft bearing part of the supercharger is cooled by the engine cooling water that passes the water-cooling-type oil cooler. The engine cooling water is desirably supplied from the cylinder jacket to the water-cooling-type oil cooler.

Engine equipped with supercharger

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.

Engine that includes blow-by-gas returning system

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.

Engine stopping device

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.

Oil cooling structure of engine

A cooling structure of a water-cooled engine includes: a plurality of cylindersarranged in a cylinder block; and a water jacket W formed around the plurality of cylinders. The water jacket W includes a pair of main flow pathsformed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow pathsformed between adjacent cylindersin a state of connecting the pair of main flow paths. Guide walls, capable of guiding the cooling water flowing in the main flow pathsto the inter-bore flow paths, are formed in the cylinder block

Cooling structure of water-cooled engine

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.

Engine

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.

Device with adjustment bolt

A piston for an engine is provided, that makes it possible to improve supply of engine oil to a recessed part thereof. The piston includes a resin coating film and a recessed part on a surface of a skirt part. In the piston, resin coating films are distributed in a patchy fashion on the surface of the skirt part. The recessed part is formed by the surface of the skirt part, between adjacent surfaces of the patchy resin coating films and by the adjacent resin coating films, forming a net-like groove. An outer-edge resin coating film, extending in a piston movement direction, is provided at the ends, in a piston circumferential direction of the skirt part.

Piston for engine

There is provided an engine lubricating device with which passage resistance of an oil strainer can be reduced and a support stay for an oil filter is unnecessary. An oil strainer includes an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder respectively have straight central axes and form inner and outer double cylinders, the outer cylinder has a strainer inlet at a lower end, the inner cylinder has a peripheral wall formed as a filter portion, the oil strainer is led out in an orientation inclined downward from the cylinder block toward an inner bottom portion of an oil pan, an upper end portion of the outer cylinder is fixed to a cylinder block, and an upper end opening portion of the inner cylinder communicates with an oil passage inlet of the cylinder block.

Growing community of inventors

Sakai, Japan

Hiroki Oso