Title:
CYLINDER HEAD
Document Type and Number:
Japanese Patent JPH03105005
Kind Code:
A
Abstract:
PURPOSE:To improve sharply durability by forming a valve seat surface with a brass alloyed layer, on the surface of which a hard metal compound is contained at a specified area ratio and the longitudinal direction of the hard metal compound deposition is in the specific direction. CONSTITUTION:A cylinder head 1 is made of an aluminum alloy and is provided with each valve seat surface of a suction side and an exhaust side. In this state, a specified valve seat surface 9 described below is formed at least on the exhaust side valve seat surface 6. The specified valve seat surface 9 is formed with a brass alloyed layer 12 on which surface a needle shaped hard metal compound 11 of Mn5Si3 or the like is contained at an area ratio of 5% or more, and the longitudinal direction of the hard metal compound deposition is almost parallel with the inclined direction of the valve seat surface 9. An heat influence layer 13 is formed in the vicinity of the brass alloyed layer 12 of the cylinder head 1.
Inventors:
KANO MAKOTO
TANIMOTO ICHIRO
TANIMOTO ICHIRO
Application Number:
JP23912089A
Publication Date:
May 01, 1991
Filing Date:
September 14, 1989
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F01L3/02; B23K9/04; C22C9/04; C22C47/00; C22C49/00; C22C49/06; F01L3/22; (IPC1-7): B23K9/04; C22C1/09; C22C9/04; F01L3/02; F01L3/22
Attorney, Agent or Firm:
Yutaka Oshio