Internal-combustion engines – Poppet valve operating mechanism – Rod
Patent
1988-09-28
1989-07-18
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
Rod
123 9051, 291567B, F01L 114
Patent
active
048482862
ABSTRACT:
Pivot rods, such as push rods of the type found in fuel injector and engine cylinder valve drive trains, wherein a pivot element is formed of a ceramic material that is joined to a nonceramic mounting shaft as a tip portion thereof, and a method for its manufacture are improved by utilizing an attachment sleeve to interconnect the pivot element to the mounting shaft in an end-to-end abutting fashion. The attachment sleeve is secured to a portion of the pivot insert by a first interference fit securement and to an end portion of the mounting shaft by a second interference fit securement. The combined axial length of the first portion of the pivot insert and the end portion of the mounting shaft is greater than the axial length of the attachment sleeve for preventing load transmission between the mounting shaft and the pivot insert via the attachment sleeve and the diameters thereof are coordinated to the maximum tensile principle stress of the pivot insert and the thickness and material of the attachment sleeve to result in deformation of the attachment sleeve during creation of the interference fit securements without exceeding the maximum tensile principle stress of the ceramic and, preferably, so as to result in the attachment sleeve being deformed along its full length to a substantially constant outer diameter that is equal to that of the outer diameter of a second portion of the pivot insert and the body portion of the mounting shaft.
REFERENCES:
patent: 2434080 (1948-01-01), Rosa
patent: 2960080 (1960-11-01), Burnard et al.
patent: 4453505 (1984-06-01), Holtzberg et al.
Cummins Engine Company, Inc.
Lo Weilun
Wolfe Willis R.
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