1993-11-01

Development of an Inexpensive, Highly Wear-Resistant Ceramic Cam Follower - Part 2 Brazing Technology 931934

Ceramic materials such as silicon nitride and sialon are known for their excellent wear-resistance and scuffing-resistance even under high contact pressure and poor lubrication1. However, ceramic materials, which have excellent sliding properties, are not widely adopted for valve train components, at present. A main reason for this is their high cost. A ceramic cam follower, newly developed by utilizing the direct brazing technology, has the following features and can be produced at the lowest cost:
  1. (1)
    Parts are only three.
    -A thin ceramic disc, a steel body, and an active brazing foil.
  2. (2)
    No grinding is necessary after brazing.
    -A crowning at the cam sliding surface is formed by the difference of the thermal expansion coefficients between silicon nitride and steel.
  3. (3)
    No hardening is necessary after brazing.
    -The steel body is hardened by the heat treatment of brazing.
Ceramic cam followers manufactured by the direct brazing were evaluated using a heat cycle tester and a cam motoring tester which could apply repeated impacts, to verify reliability and durability. Neither cracks nor break-away problems occurred after these endurance tests.
This paper describes the direct brazing technology for the ceramic cam followers, which were first adopted for the mass-produced engines in 1993.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Development of an Inexpensive, Highly Wear-Resistant Ceramic Cam Follower - Part 1 Engine Test Results

931933

View Details

TECHNICAL PAPER

New FeCrAl Alloys for Diesel Engine Catalytic Converters

2004-01-1491

View Details

TECHNICAL PAPER

Techniques for Manufacturing and Coating Liners of Small Engines

2000-01-0904

View Details

X