Method and apparatus for manufacturing a contoured internal diameter bushing
US4290236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B5/40
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
PCT No. PCT/US79/00322 Sec. 371 Date May 14, 1979 Sec. 102(e) Date May 14, 1979 PCT Filed May 14, 1979 WO80/02526 Nov. 27, 1980 The ends (14,16) of cylindrical bushings 10) in which pins rotate bear relatively heavy loads. This can lead to a slight internal deformation of the bushing (10) which can interfere with free rotation of the pin. Such a problem is encountered, for example, with track pin bushings. A solution to this problem is to contour the ends (14,16) of the bushing (10) so that the inner diameter thereof flares (28,30) outwardly toward the bushing ends (14,16). This has not previously been accomplished via a single relatively non-critical operation. In the present invention a first end (14) of a cylindrically bored tube (10) is compressed radially inwardly sufficient to force it to a reduced internal diameter (18). The tube (10) is then bored axially inwardly while it is compressed with a boring tool (22) which bores a hole of a diameter (21) greater than the diameter (18) induced by the compressing. After the boring, the end (14) is released and its external dimension (24) returns towards its uncompressed size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.