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. 25, 2017
Filed:
Apr. 22, 2014
Hitachi Chemical Company, Ltd., Tokyo, JP;
HITACHI CHEMICAL COMPANY, LTD., Tokyo, JP;
Abstract
The oil-impregnated sintered bearing made of iron-copper sintered alloy consisting of 10-59% of Cu, 0.5-3% of Sn, and balance of Fe and impurities, includes pores in the iron-copper sintered alloy matrix of not less than 800 per mm, has pores exposed at 20-50% by area ratio at the inner circumferential surface with diameters greater than 100 μm, not more than 0.5%, respectable to the total pores number. The pores number with diameters greater than 80 μm and not greater than 100 μm, not more than 0.1%, respectable to the total pores number with diameters greater than 60 μm and not greater than 80 μm is 0.5-1.5%, respectable to the total pores number, with diameters greater than 40 μm and not greater than 60 μm is 0.8-3% respectable to the total pores number, and the remainder pores are with diameters less than 40 μm.