Stossstange mit keramischen Lagerenden und deren Herstellungsverfahren.

摘要

Pivot rods, such as push rods of the type found in fuel injector and engine cylinder valve drive trains, wherein a pivot element (15, 20) is formed of a ceramic material that is joined to a nonceramic mounting shaft (5) as a tip portion thereof, and a method for its manufacture are improved by utilizing an attachment sleeve (10) to interconnect the pivot element to the mounting shaft in an end-to-end abutting fashion. The attachment sleeve (10) is secured to a portion of the pivot insert (15, 20) by a first interference fit securement and to an end portion of the mounting shaft (5) 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 (which projects axially from the receiving space of the attachment sleeve) and the body portion of the mounting shaft.