Assembled camshaft for I. C. engines with forged powder metal cams
A key element in the Automotive Industry's efforts to improve fuel economy and engine performance is the introduction of roller tappets to reduce friction in valve trains. As a result, contact stresses in excess of 200,000 psi may be experienced at the roller and cam (shaft) interface. Conventional cast iron camshafts cannot effectively carry this stress level. After studying several alternatives, the authors have developed a camshaft which promises to be a viable solution to the problem, both technically and economically. The purpose of this work was to demonstrate the acceptable wear performance of an assembled camshaft containing forged powder metal lobes in a series of motored engine tests with roller hydraulic valve train. In this study, a camshaft consisting of a carbon steel tube and forged powder metal lobes (4660 composition) joined by brazing was tested at low speed and at high speed in a motored engine at approximately 250,000 psi maximum contact stress.
- Research Organization:
- Torrington/Fafnir Co., Research Dept.
- OSTI ID:
- 6513925
- Report Number(s):
- CONF-870204-
- Resource Relation:
- Conference: Society of Automotive Engineers international congress and expo, Detroit, MI, USA, 23 Feb 1987; Other Information: 870129
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CARBON STEELS
BRAZING
FORGING
INTERNAL COMBUSTION ENGINES
FUEL ECONOMY
SHAFTS
FRICTION
WEAR RESISTANCE
HYDRAULICS
METALS
PERFORMANCE
POWDER METALLURGY
POWDERS
STRESS ANALYSIS
SURFACE TREATMENTS
VALVES
ALLOYS
CONTROL EQUIPMENT
ELEMENTS
ENGINES
EQUIPMENT
FABRICATION
FLOW REGULATORS
FLUID MECHANICS
HEAT ENGINES
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MACHINE PARTS
MATERIALS WORKING
MECHANICAL PROPERTIES
MECHANICS
METALLURGY
STEELS
WELDING
330100* - Internal Combustion Engines
360101 - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties