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:
Aug. 28, 2001
Filed:
Apr. 19, 1999
Takao Nishioka, Itami, JP;
Yasushi Mochida, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A fuel injection pump for high pressure injecting gasoline, fuel whose main component is gasoline or light oil having a sulfur content of 0.05% by weight or less by a reciprocation of a piston sliding relative to a cylinder, wherein at least a sliding surface of the piston to slide on the cylinder is made of ceramic and the surface roughness thereof, expressed in ten-point mean surface roughness R,, is 0.05-0.4 &mgr;m in a direction perpendicular to the sliding direction and 0.2-0.6 &mgr;m in a direction parallel to the sliding direction while the surface roughness expressed in the ten-point mean surface roughness R,of a cylinder sliding surface corresponding thereto is 0.2-0.8 &mgr;m in a direction parallel to the sliding direction. By using the above combination of piston and cylinder, the wear resistance of the piston and cylinder is improved, the durability thereof is improved and the production cost can be largely reduced.