Wear resistant tappet

Details Wear resistant tappet Wear resistant tappet

Filed on

1997-07-29

Date issued

1998-11-24

Examiner

Lo, Weilun

Patent Class

Internal-combustion engines

SubClass

Poppet valve operating mechanism

SubSubClass

Tappet

Other Related Categories

74569, F01L 116

Type

Patent

Status

active

Patent number

058394028

Description

ABSTRACT:
A tappet made of Al alloy is used in a valve operating mechanism of an internal combustion engine of a vehicle. On the whole outer circumferential surface of the tappet, a helical projection and a helical groove are formed alternately to form an uneven surface. A plurality of uneven surfaces are formed on a ridge of the projection at regular intervals. The outer circumferential surface is coated with a wear resistant Fe film by thermal spraying. The uneven surfaces on the projection provide high adhesion strength of the film to the outer circumferential surface of the tappet to improve peel resistance, thereby increasing durability and reliability of the Al alloy tappet.

REFERENCES:
patent: 4909198 (1990-03-01), Shiraya et al.
patent: 5289804 (1994-03-01), Mori
patent: 5562076 (1997-09-01), Ohtsubo et al.
patent: 5596959 (1997-01-01), Kenmoku et al.
patent: 5605122 (1997-02-01), Hara et al.

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