The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2019
Filed:
Dec. 21, 2016
Nippon Piston Ring Co., Ltd., Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Sanyo Special Steel Co., Ltd., Hyogo, JP;
Satoshi Ikemi, Tochigi, JP;
Hiroshi Oshige, Tochigi, JP;
Seisuke Takaki, Tochigi, JP;
Tomoki Okita, Saitama, JP;
Keisuke Ishii, Saitama, JP;
Toshiyuki Sawada, Hyogo, JP;
Hiroyuki Hasegawa, Hyogo, JP;
NIPPON PISTON RING CO., LTD., Saitama, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
SANYO SPECIAL STEEL CO., LTD., Hyogo, JP;
Abstract
Provided is a valve seat insert made of an iron-base sintered alloy, in which a base matrix part that includes a base matrix phase and hard particles, has a base matrix part composition containing, in % by mass, 0.5%-2.0% of carbon and 10%-70% in total of one kind or two or more kinds selected from nickel, cobalt, chromium, molybdenum, vanadium, tungsten, manganese, silicon and sulfur, with the balance being iron and unavoidable impurities, and Co-base hard particles having a composition containing, 1.0% or less of C, 25%-50% of Mo, 5%-15% of Cr, Si as an impurity in a content adjusted to be 0.3% or less, with the balance being Co, and having a Vickers hardness of 500 to 1,500 HV, are dispersed as hard particles in the base matrix phase in an amount of 10%-60% by mass with respect to the total amount of the valve seat insert.