公开(公告)号：US20180179984A1

公开(公告)日：2018-06-28

申请号：US15827670

申请日：2017-11-30

Applicant: KUBOTA Corporation

Inventor： Hiroki OSO ,  Takahiro YAMAZAKI ,  Hideyuki KOYAMA ,  Rina KANEKO ,  Yoshinori TANAKA ,  Takashi YAMAGUCHI ,  Akira TANAKA

IPC: F02F1/10 ,  F01P3/02 ,  F01P11/04

CPC classification number: F02F1/10 ,  F01P3/02 ,  F01P11/04 ,  F01P2003/021 ,  F02F1/14 ,  F02F2001/106

Abstract: A cooling structure of a water-cooled engine includes: a plurality of cylinders 2 arranged in a cylinder block 1; and a water jacket W formed around the plurality of cylinders 2. The water jacket W includes a pair of main flow paths 7, 8 formed in a state of extending in a cylinder arrangement direction outside the cylinders, and inter-bore flow paths 9, 10 formed between adjacent cylinders 2 in a state of connecting the pair of main flow paths 7, 8. Guide walls 11h, 13h, capable of guiding the cooling water flowing in the main flow paths 7, 8 to the inter-bore flow paths 9, 10, are formed in the cylinder block 1.

公开(公告)号：US20250020088A1

公开(公告)日：2025-01-16

申请号：US18717543

申请日：2022-08-29

Applicant: KUBOTA CORPORATION

Inventor： Yasushi KOBAYASHI ,  Naotaro NAGAI ,  Rina KANEKO ,  Masanari TENNOMI ,  Naruhiro MATSUO

IPC: F02D41/40 ,  F02B3/06 ,  F02B19/08

Abstract: A diesel engine 1 includes: an injector 15; a control device which controls an injection timing of fuel 81 injected from the injector 15; and exhaust circulating means. The control device controls the injection timing of main injection and pre-injection performed prior to the main injection and executes control such that, by ensuring a premixing period of the pre-injection from start of the pre-injection until ignition of an air-fuel mixture of the fuel 81 injected by the pre-injection and the air AR, a homogenous and lean premixed air-fuel mixture is generated in the auxiliary combustion chamber 13 by the fuel 81 injected by the pre-injection and air AR, and the premixing period of the main injection from the start of the main injection until ignition of the air-fuel mixture of the fuel 81 injected by the main injection and the air AR is ensured.

公开(公告)号：US20180003093A1

公开(公告)日：2018-01-04

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

IPC: F01M5/00 ,  F01M1/02 ,  F01M11/02 ,  F02B67/04

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.

公开(公告)号：US20240044283A1

公开(公告)日：2024-02-08

申请号：US18266586

申请日：2021-10-25

Applicant: KUBOTA Corporation

Inventor： Hiroki OSO ,  Yuki TAGASHIRA ,  Akira TAMURA ,  Rina KANEKO ,  Kiichi SUEHIRO

IPC: F02B19/18 ,  F01P1/10 ,  F02M61/14 ,  F02F11/00

CPC classification number: F02B19/18 ,  F01P1/10 ,  F02M61/14 ,  F02F11/002

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.

公开(公告)号：US20170350344A1

公开(公告)日：2017-12-07

申请号：US15609195

申请日：2017-05-31

Applicant: KUBOTA Corporation

Inventor： Hiroki OSO ,  Hideyuki KOYAMA ,  Takahiro YAMAZAKI ,  Kentaro NAGAI ,  Rina KANEKO

IPC: F02F3/10

CPC classification number: F02F3/10

Abstract: 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.