Light metal alloy piston

Details Light metal alloy piston Light metal alloy piston

1986-03-25

1987-06-02

Ostrager, Allen M.

Expansible chamber devices

Piston

Open-ended hollow skirt type

92229, F02F 308, F16J 101

Patent

active

046693670

ABSTRACT:
A light metal alloy cast piston including a thermal strut (32, 48, 52) arranged in a shoulder portion of the piston skirt. The thermal strut is composed of an annular fiber-reinforced metal portion in which high-tensile-strength reinforcing fibers are integrally molded. The reinforcing fibers include first fibers (34), such as carbon fibers, having a coefficient of linear expansion substantially smaller than that of the matrix metal alloy, and second fibers (36), such as silicon carbide fibers and alumina fibers, having a flexural or bending strength larger than that of the first fibers. The first fibers primarily serve to restrain thermal expansion of the piston skirt and the second fibers, having a larger bending strength, act to protect the first fibers from excessive bending forces. In a preferred embodiment, the first fibers are located in the inner region of the thermal strut and the second fibers are arranged in the outer region.

REFERENCES:
patent: 2221535 (1940-11-01), Berry

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