公开(公告)号：US11306687B2

公开(公告)日：2022-04-19

申请号：US17096928

申请日：2020-11-12

Applicant: KUBOTA Corporation

Inventor： Kentaro Nagai ,  Ryutaro Komura ,  Takashi Yamaguchi ,  Kumiko Sakaguchi ,  Takahiro Yamazaki

IPC: F02B47/08 ,  F02M26/05 ,  F02M26/43 ,  F01N13/10 ,  F02F1/24

Abstract: An engine exhaust manifold including exhaust inlet parts at four locations corresponding to a plurality of exhaust ports, one exhaust outlet part, and an exhaust confluence part to collect exhaust gas from each of the exhaust inlet parts and send to the exhaust outlet part. An EGR passage part to send EGR gas toward an intake passage is formed.

公开(公告)号：US11078872B2

公开(公告)日：2021-08-03

申请号：US16202209

申请日：2018-11-28

Applicant: KUBOTA Corporation

Inventor： Yoshikazu Takemoto ,  Hideyuki Goto ,  Takahito Hamasaki ,  Kentaro Nagai ,  Tomoya Akitomo ,  Kumiko Sakaguchi

IPC: F02M26/22 ,  F02M26/41 ,  F02M26/13 ,  F28D7/10 ,  F02M26/11 ,  F28D21/00 ,  F28F1/06 ,  F28F1/02 ,  F01P3/20

Abstract: An engine with an EGR device includes an engine case, and an EGR pipe that introduces an EGR gas into an intake path. The EGR pipe is arranged to pass through an inside of the engine case. A part of the EGR pipe in the engine case is arranged to face a cooling water path in the engine case. The engine case is defined by a cylinder head. The cooling water path is arranged to surround a whole circumference of the EGR pipe.

公开(公告)号：US10941684B2

公开(公告)日：2021-03-09

申请号：US16683394

申请日：2019-11-14

Applicant: KUBOTA Corporation

Inventor： Kentaro Nagai ,  Takahiro Yamazaki ,  Reo Yoshida ,  Tomoya Akitomo ,  Shoichi Okimi

IPC: F01M13/00 ,  F02B75/20 ,  F02M25/06

Abstract: A cylinder head cover that prevents the gas outlet for the blow-by gas from being cooled by structural improvements so that the gas outlet does not freeze or become clogged in a cold condition. A cylinder head cover includes: a gas passage through which blow-by gas from a crankcase passes; and a gas outlet portion protruding upward from a head cover upper wall. The gas outlet portion includes a protruding case portion bulging upward from the head cover upper wall so as to form an outlet passage through which blow-by gas passes, and an air layer is formed outside the outlet passage in the protruding case portion.

公开(公告)号：US10161353B2

公开(公告)日：2018-12-25

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: F16J1/08 ,  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.

公开(公告)号：US10132215B2

公开(公告)日：2018-11-20

申请号：US14959174

申请日：2015-12-04

Applicant: KUBOTA Corporation

Inventor： Kentaro Nagai ,  Hideyuki Goto ,  Takahiro Yamazaki ,  Hiroki Oso

IPC: F01M11/03 ,  F01M1/10 ,  F01M11/00 ,  F01M1/02

Abstract: 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.

公开(公告)号：US10060325B2

公开(公告)日：2018-08-28

申请号：US14842988

申请日：2015-09-02

Applicant: KUBOTA Corporation

Inventor： Kentaro Nagai ,  Hiroshi Kuwasaki ,  Tadashi Nakano ,  Takahito Hamasaki ,  Yoshinori Tanaka ,  Masaya Mori

IPC: F01P3/02 ,  F02F1/40 ,  F01P11/04 ,  F02F1/14 ,  F02F1/42 ,  F02M35/10 ,  F02M35/104

CPC classification number: F01P3/02 ,  F01P11/04 ,  F01P2003/021 ,  F01P2003/024 ,  F02F1/14 ,  F02F1/40 ,  F02F1/4285 ,  F02M35/10091 ,  F02M35/104

Abstract: There is provided a cylinder head cooling apparatus of an engine capable of enhancing cooling efficiency around an auxiliary combustion chamber wall. The cylinder head cooling apparatus of an engine including a cylinder head having therein an intake port, an exhaust port, an auxiliary combustion chamber, and a cooling water jacket, in which an intake port wall, an exhaust port wall, and an auxiliary combustion chamber wall are placed in the cooling water jacket, the cooling water jacket includes a cooling water inlet and a cooling water outlet, engine cooling water flowed from the cooling water inlet into the cooling water jacket flows out from the cooling water outlet through the cooling water jacket, wherein a cooling water guide wall is provided upstream of the auxiliary combustion chamber wall in a cooling water passing path of the cooling water jacket, and the upstream cooling water guide wall is formed into a shape whose width gradually widens toward a downstream side.

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

IPC: F01M13/00 ,  F01M13/04

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.

公开(公告)号：US09828933B2

公开(公告)日：2017-11-28

申请号：US14633317

申请日：2015-02-27

Applicant: KUBOTA Corporation

Inventor： Kentaro Nagai ,  Hideyuki Koyama ,  Hideyuki Goto ,  Takahiro Yamazaki ,  Hiroshi Kuwasaki

IPC: F02F1/10 ,  F02F1/16 ,  F02F1/14 ,  F01P3/02

CPC classification number: F02F1/16 ,  F01P3/02 ,  F01P2003/021 ,  F02F1/10 ,  F02F1/14 ,  F02F2001/106

Abstract: An engine cooler capable of suppressing a piston slap sound is provided. The engine cooler includes a cylinder block including a cylinder barrel and a water jacket, and a spacer stored in the water jacket, the water jacket surrounds the cylinder barrel, and the spacer encloses the cylinder barrel. Given that a width direction of the cylinder block is a lateral direction, a pressed member is pressed between the cylinder barrel and the spacer on lateral sides of the cylinder barrel, and a lower end of the pressed member is disposed above a lower end of each of right and left skirts of a piston located at a top dead center.

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

IPC: F01M11/02 ,  F01M5/00 ,  F02F7/00 ,  F16H57/04 ,  F02B67/06 ,  F01M1/02 ,  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：US09771854B2

公开(公告)日：2017-09-26

申请号：US14842520

申请日：2015-09-01

Applicant: KUBOTA Corporation

Inventor： Naoya Sakurai ,  Hideyuki Koyama ,  Hideyuki Goto ,  Kentaro Nagai ,  Tadashi Nakano

IPC: F02F1/10 ,  F02F1/14 ,  F01P5/10 ,  F02F1/36 ,  F01P7/16 ,  F01P5/12 ,  F01P11/04 ,  F01P1/06 ,  F01P5/02 ,  F01P3/02

CPC classification number: F01P7/16 ,  F01P1/06 ,  F01P3/02 ,  F01P5/02 ,  F01P5/10 ,  F01P5/12 ,  F01P11/04 ,  F01P2003/024 ,  F01P2003/025

Abstract: There is provided an engine water-cooling device that can increase warming-up efficiency of an engine. The engine water-cooling device includes a thermostat housing that houses a thermostat. The thermostat housing is mounted to a front wall of a cylinder head in one side portion in a width direction of the cylinder head. A cooling water pump is mounted to a front wall of a cylinder block in a central portion in a width direction of the cylinder block. A bypass passage includes an intra-head bypass passage in the cylinder head, and the intra-head bypass passage includes a width-direction passage portion extending from a position behind the thermostat housing to a position behind and above the cooling water pump.