公开(公告)号：US11371465B2

公开(公告)日：2022-06-28

申请号：US16323280

申请日：2018-10-29

Applicant: Komatsu Ltd.

Inventor： Yuuki Kageyama ,  Shouhei Nagasaka

IPC: F02F1/36 ,  F02F1/42 ,  F02F1/26 ,  F02F1/24

Abstract: The cylinder head 3 includes: a lower deck; a wall portion including an upper deck and a lower deck; an upper deck that is provided above the lower deck so as to face the lower deck and that defines a cooling water flow space between the lower deck and the upper deck; and a wall portion that is formed between the lower deck and the upper deck and includes a valve-hole forming wall 40 forming an intake valve hole and an exhaust valve hole which are opened into a lower surface of the lower deck. The lower deck includes: a cooling water introduction hole that passes through the lower deck in a vertical direction so as to extend in a circumferential direction of a virtual circle VC surrounding a valve-hole forming wall in a plan view; and a rib that projects from an upper surface of the lower deck.

公开(公告)号：US11242819B2

公开(公告)日：2022-02-08

申请号：US17041199

申请日：2020-02-17

Applicant: Komatsu Ltd.

Inventor： Yuuki Kageyama ,  Akihiro Miki

IPC: F02F1/36 ,  F02M26/65

Abstract: A cylinder head includes: a cylinder head body that includes a lower deck, an upper deck defining a first cooling water space together with the lower deck, and valve hole-forming walls; a rocker housing that includes a rocker-side wall formed integrally with the cylinder head body; an expansion wall portion that expands from the cylinder head body and defines a second cooling water space communicating with the first cooling water space and extending up to a position over the upper deck; and an EGR passage-forming portion that is provided in the second cooling water space.

公开(公告)号：US20210348579A1

公开(公告)日：2021-11-11

申请号：US16323280

申请日：2018-10-29

Applicant: Komatsu Ltd.

Inventor： Yuuki Kageyama ,  Shouhei Nagasaka

IPC: F02F1/36 ,  F02F1/42

Abstract: The cylinder head 3 includes: a lower deck; a wall portion including an upper deck and a lower deck; an upper deck that is provided above the lower deck so as to face the lower deck and that defines a cooling water flow space between the lower deck and the upper deck; and a wall portion that is formed between the lower deck and the upper deck and includes a valve-hole forming wall 40 forming an intake valve hole and an exhaust valve hole which are opened into a lower surface of the lower deck. The lower deck includes: a cooling water introduction hole that passes through the lower deck in a vertical direction so as to extend in a circumferential direction of a virtual circle VC surrounding a valve-hole forming wall in a plan view; and a rib that projects from an upper surface of the lower deck.

公开(公告)号：US20210254579A1

公开(公告)日：2021-08-19

申请号：US17041199

申请日：2020-02-17

Applicant: Komatsu Ltd.

Inventor： Yuuki Kageyama ,  Akihiro Miki

IPC: F02F1/36 ,  F02M26/65

Abstract: A cylinder head includes: a cylinder head body that includes a lower deck, an upper deck defining a first cooling water space together with the lower deck, and valve hole-forming walls; a rocker housing that includes a rocker-side wall formed integrally with the cylinder head body; an expansion wall portion that expands from the cylinder head body and defines a second cooling water space communicating with the first cooling water space and extending up to a position over the upper deck; and an EGR passage-forming portion that is provided in the second cooling water space.

公开(公告)号：US10968861B2

公开(公告)日：2021-04-06

申请号：US16318866

申请日：2018-10-29

Applicant: Komatsu Ltd.

Inventor： Yuuki Kageyama

IPC: F02F1/24 ,  F01M9/10 ,  F02F1/42 ,  F02B31/04 ,  F01L1/18 ,  F01P3/02

Abstract: The cylinder head includes an intake port communicating with a cylinder of a cylinder block, a cylinder head main body having an exhaust port communicating with the cylinder, and a rocker housing integrally formed on the cylinder head main body and an inner side of which is defined as a valve-system accommodating space. The rocker housing includes a lateral wall having a lateral wall main body and a base end portion which extends along a lower end of the lateral wall main body, connects the lateral wall main body to the cylinder head main body, and has a thickness thicker than that of the lateral wall body. A flow path which extends in an extending direction of the base end portion and through which a fluid flow is formed in the base end portion.