Valve moving push rod for internal combustion engines and method

Details Valve moving push rod for internal combustion engines and method Valve moving push rod for internal combustion engines and method

1978-09-20

1980-08-26

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Rod

291567B, 74579R, 148127, 2191171, F01L 114

Patent

active

042189969

ABSTRACT:
This invention is made with a view to increasing the fusing strength of an end piece in a valve moving push rod for internal combustion engines. The fusing part of the push rod according to the present invention consists of an .alpha.-martensite structure and a primary truestite structure in a cotransition boundary range of a segmental section formed into the hardened layer of the end piece from the fused boundary surface of the end piece with a tube end part and is provided with a tough mixed layer arcuated from the inside end part of the above mentioned fused boundary surface to the outside end part thereof. This mixed layer is obtained by reducing by a heat feeding means a quick temperature drop caused by the fusing part simultaneously with cutting off the fusing current in welding by electric resistance the end piece on the fixed side surface to the peripheral edge of the end port of a tube material. Such crack as is recognized in the fusing part of a conventional product is not recognized in a product obtained by reducing the quick cooling by this method.

REFERENCES:
patent: 1252144 (1918-01-01), Murray et al.
patent: 2162229 (1939-06-01), Remington
patent: 2262705 (1941-11-01), Tuttle
patent: 2960080 (1960-11-01), Burnard
patent: 3066658 (1962-12-01), Gondek
patent: 3094107 (1963-06-01), Gondek
patent: 3101402 (1963-08-01), Gondek
patent: 3191290 (1965-06-01), Knox
patent: 3549853 (1970-12-01), Guido
patent: 3857013 (1974-12-01), Niesse
R. T. Gillette, "Resistance-Welding Laboratory Facilities", General Electric Review, Jul. 1945, pp. 26-29.

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