Ceramic tiped pivot rod and method for its manufacture
US4848286A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1988 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49295
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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 an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.