Rocker arm having wear resistant scuffing resistant portion

Assignee: Nippon Piston Ring Co Ltd

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Filing: 1988-05-25

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Granted: 1989-10-03

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Expires: 2008-05-25

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Abstract

Abstract A rocker arm for use in an internal combustion engine. The rocker arm has a portion abutting an opponent mechanical component, and at least the portion is formed of a cast iron consisting of from 2.5 to 3.7 wt % of carbon; from 1.0 to 2.0 wt % of silicon; from 0.5 to 1.0 wt % of manganese; from 10 to 20 wt % of chromium; from 0.3 to 0.7 wt % of nickel; not more than 0.3 wt % of phosphorus; not more than 0.1 wt % of sulfur; and balance iron and impurities; Carbide mainly containing chromium is uniformly precipitated from at least one of pearlitic and martensitic matrix in the cast iron.

Inventors

👤 Yoshikatsu Nakamura
👤 Osamu Kawamura
👤 Souichi Shimomura

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-10-29 11:51

CPC Classifications

C; C22; C22C; C22C37/00; C22C37/06; C22C37/08; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20882

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 114 words

A rocker arm for use in an internal combustion engine, said rocker arm having a portion abutting an opponent mechanical component, at least said portion being formed of a cast iron consisting of from 2.5 to 3.7 wt % of carbon; from 1.0 to 2.0 wt % of silicon; from 0.5 to 1.0 wt % of manganese; from 10 to 20 wt % of chromium; from 0.3 to 0.7 wt % of nickel; not more than 0.3 wt % of phosphorus; not more than 0.1 wt % of sulfur; and balance iron and impurities; carbide mainly containing chromium being uniformly precipitated from at least one of pearlitic and martensitic matrix in said cast iron.

Claim 2

Dependent Claim 114 words

Claim 3

Dependent Claim 133 words

A rocker arm for use in an internal combustion engine, said rocker arm having a portion abutting an opponent mechanical component, at least said portion being formed of a cast iron consisting of from 2.5 to 3.7 wt % of carbon; from 1.0 to 2.0 wt % of silicon; from 0.5 to 1.0 wt % of manganese; from 10 to 20 wt % of chromium; from 0.3 to 0.7 wt % of nickel; from 1 to 10 wt % of at least one component selected from tungsten, vanadium, niobium and tantalum; not more than 0.3 wt % of phosphorus; not more than 0.1 wt % of sulfur; and balance iron and impurities; iron carbide mainly containing chromium being uniformly precipitated from at least one of pearlitic and martensitic matrix in said cast iron.

Claim 4

Dependent Claim 133 words

A rocker arm for use in an internal combustion engine, said rocker arm having a portion abutting an opponent mechanical component, at least said portion being formed of a cast iron consisting of from 2.5 to 3.7 wt % of carbon; from 1.0 to 2.0 wt % of silicon; from 0.5 to 1.0 wt % of manganese; from 10 to 20 wt % of chromium; from 0.3 to 0.7 wt % of nickel; from 1 to 10 wt % of at least one component selected from tungsten, vanadium, niobium and tantalum; not more than 0.3 wt % of phosphorus; not more than 0.1 wt % of sulfur; and balance iron and impurities; iron carbide mainly containing chromium being uniformly precipitated from at least one of pearlitic and martensitic matrix in said cast iron.

References Cited (Backward Citations)

US2963011A Cited

GB1111290A Cited

GB1196865A Cited

DE2747757A1 Cited

US4360383A Cited

GB2073247A Cited

JPS56129710A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-10-02	1993-04-03	1993-10-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-10-02	1997-04-03	1997-10-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-10-02	2001-04-03	2001-10-03	$7700.00	Window Closed / Lapsed

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