公开(公告)号：US20200340388A1

公开(公告)日：2020-10-29

申请号：US16857245

申请日：2020-04-24

Applicant: KUBOTA Corporation

Inventor： Hiroki OSO ,  Nobuyoshi OKADA ,  Hideyuki KOYAMA ,  Yoshinori TANAKA ,  Kenji OKAMOTO

IPC: F01N13/16 ,  F01N13/18 ,  F01N13/10 ,  F02B37/02

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.

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：US20130207350A1

公开(公告)日：2013-08-15

申请号：US13760296

申请日：2013-02-06

Applicant: KUBOTA Corporation

Inventor： Hiroki KUWAYAMA ,  Takahiro YAMAZAKI ,  Yutaka ISHIGAKI ,  Hideyuki KOYAMA ,  Manabu MIYAZAKI ,  Yoshinori TANAKA ,  Keita NAITO ,  Hidetaka MORINAGA

IPC: F02F5/00

CPC classification number: F02F5/00 ,  F16J1/09 ,  F16J9/00 ,  F16J9/22

Abstract: An engine in which an oil consumption and a leakage of blow-by gas can be stably reduced for a long period of time. The engine includes a first land (3), a first ring groove (4), a second land (5), a second ring groove (6), a third land (7), a third ring groove (8), and a piston skirt (9) formed on a piston peripheral wall (1) in the above-recited order from a side of a piston head (2). A first pressure ring (10) is fitted in the first ring groove (4). A second pressure ring (11) is fitted in the second ring groove (6), an oil ring (12) fitted in the third ring groove (8), and an indentation (13) is formed at the second land (5).

Abstract translation: 可以长时间稳定地降低油耗和窜气泄漏的发动机。 发动机包括第一平台（3），第一环槽（4），第二凸台（5），第二环槽（6），第三凸台（7），第三环槽（8）和 从活塞头（2）的一侧按照上述顺序形成在活塞周壁（1）上的活塞裙（9）。 第一压力环（10）装配在第一环形槽（4）中。 第二压力环（11）装配在第二环槽（6）中，装配在第三环槽（8）中的油环（12）和凹陷（13）形成在第二焊盘（5）处。