US 11,994,084 B2
Cylinder head, cylinder block, internal combustion engine, and method for manufacturing cylinder head
Masayuki Iizumi, Kanagawa (JP); Motoi Kawashima, Kanagawa (JP); Takuya Kumagai, Kanagawa (JP); Makoto Sakaguchi, Kanagawa (JP); Kazunori Sawazaki, Kanagawa (JP); Hideho Narita, Kanagawa (JP); and Ryuji Katayama, Kanagawa (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
Appl. No. 17/911,861
Filed by MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD., Sagamihara (JP)
PCT Filed Apr. 15, 2021, PCT No. PCT/JP2021/015606
§ 371(c)(1), (2) Date Sep. 15, 2022,
PCT Pub. No. WO2021/210649, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-073563 (JP), filed on Apr. 16, 2020.
Prior Publication US 2023/0128222 A1, Apr. 27, 2023
Int. Cl. F02F 1/40 (2006.01); C21D 1/09 (2006.01); C21D 5/00 (2006.01); C21D 9/00 (2006.01)
CPC F02F 1/40 (2013.01) [C21D 1/09 (2013.01); C21D 5/00 (2013.01); C21D 9/0068 (2013.01); C21D 2221/01 (2013.01); F02F 2200/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A cylinder head to be attached to a cylinder block with an opening formed on a first surface of the cylinder block, wherein
a second surface of the cylinder head on a side to be attached to the cylinder block includes a first portion overlapping the opening and a second portion overlapping the first surface except the opening; and
the second portion includes a first region and a second region having hardness higher than that of the first region.