Title:
ADJUSTING SHIM AND IS MANUFACTURE
Document Type and Number:
Japanese Patent JP3167227
Kind Code:
B2
Abstract:
PURPOSE: To reduce the friction coefficient simply and certainly and improve the sliding characteristics by forming an adjusting shim to slide in mating with a cam from a ceramic material having a Vickers hardness which exceeds a certain specific value, and furnishing a specific denatured layer over the sliding surface with cam.
CONSTITUTION: A linear motion type dynamic valve device of an internal combustion engine has a valve lifter 4 which moves in the axial direction through the interaction of a valve spring 5 and a cam 1 rotating round a cam shaft 2, and thereby the suction/exhaust valve 6 at the cylinder head 7 is opened and closed. An adjusting shin 3 to slide in mating with the cam 1 is installed on the oversurface of the valve lifter 4. The shins 3 is made of a ceramic material having a Vickers hardness exceeding 1000. A denatured layer as formed by embrittling or removing partially the grain boundary phase of the ceramic is provided at least over the sliding surface with the cam 1. The depth of this denatured layer should be 0.2-1.0μm. The sliding surface of the cam 1 is polished by a run-in operation for improvement of the surface roughness.
Inventors:
Takeshi Nakakohara
Yoshio Fuwa
Kaoru Murabe
Akira Yamakawa
Yoshio Fuwa
Kaoru Murabe
Akira Yamakawa
Application Number:
JP22281693A
Publication Date:
May 21, 2001
Filing Date:
August 16, 1993
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
Sumitomo Electric Industries, Ltd.
Sumitomo Electric Industries, Ltd.
International Classes:
C04B41/91; F16H53/06; (IPC1-7): F16H53/06; C04B41/91
Domestic Patent References:
| JP5163909A | ||||
| JP1249680A | ||||
| JP62106U |
Attorney, Agent or Firm:
Masao Yamamoto
Previous Patent: 水改質用バブリング装置
Next Patent: ACCESS METHOD FOR VCC TABLE AND VIRTUAL CHANNEL CONVERSION DEVICE
Next Patent: ACCESS METHOD FOR VCC TABLE AND VIRTUAL CHANNEL CONVERSION DEVICE