Cylinder block, internal combustion engine, transportation apparatus, and method for producing cylinder block

(19)

(11)

EP 2 138 695 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	17.02.2010 Bulletin 2010/07

(43)	Date of publication A2:
	30.12.2009 Bulletin 2009/53

(21)	Application number: 09006877.6

(22)	Date of filing: 22.05.2009

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International Patent Classification (IPC):

F02F 1/20^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA RS

(30)

Priority:

27.06.2008 JP 2008168687

(71)	Applicant: Yamaha Hatsudoki Kabushiki Kaisha
	Iwata-shi, Shizuoka 438-8501 (JP)

(72)	Inventors:
	Iwasaki, Shinya Iwata-shi Shizuoka 438-8501 (JP) Yamagata, Hiroshi Iwata-shi Shizuoka 438-8501 (JP) Kurita, Hirotaka Iwata-shi Shizuoka 438-8501 (JP)

(74)	Representative: Schoppe, Fritz et al
	Schoppe, Zimmermann, Stöckeler & Zinkler Patentanwälte Postfach 246 82043 Pullach bei München 82043 Pullach bei München (DE)

(54)	Cylinder block, internal combustion engine, transportation apparatus, and method for producing cylinder block

(57) The cylinder block according to the present invention is a cylinder block composed of an aluminum alloy containing silicon, the cylinder block including a cylinder wall having a slide surface. The cylinder block according to the present invention includes a plurality of silicon crystal grains on the slide surface, such that the ten point-average roughness Rz_JIS of the slide surface and the load length ratio Rmr(30) of the slide surface at a cut level of 30% are larger in the upper 1/4 portion of the slide surface than in the lower 1/4 portion of the slide surface.

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