Modified rolled thread form for studs

Details Modified rolled thread form for studs Modified rolled thread form for studs

1991-02-28

1991-12-10

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Double-ended

411305, 411386, 411418, F16B 3500

Patent

active

050713019

ABSTRACT:
A stud for securing a cylinder liner to a head has a modified thread form engaging a threaded hole in the stud with an interference fit. The thread is rolled and all threads have the same pitch diameter except the endmost thread. Three relief channels are formed in the threads and extend axially from the stud end through several threads while some full threads remain to engage the hole. The relief channels decrease hoop stress in the threaded hole and allow debris developed during installation to escape from the thread interface to prevent entrapment therein.

REFERENCES:
patent: 2901019 (1959-08-01), Schweppe
patent: 3451080 (1969-06-01), McIntyre et al.
patent: 3492908 (1970-02-01), Thurston
patent: 3878759 (1975-04-01), Carlson
patent: 4258607 (1981-03-01), McKewan
patent: 4331414 (1982-05-01), Wheatley, Jr.
patent: 4673323 (1987-06-01), Russo
patent: 4973209 (1990-11-01), Essom et al.
Engine Maintenance Manual, Electro-Motive, Section 4, p. 4-1(no date).

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