Bias mechanism for single shift shaft mechanical transmissions
US6035738A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1998 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Mar 17, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20636
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bias mechanism includes a plunger secured within a bore extending in a generally tangential direction through a shift fork hub and intersecting a transverse aperture for mounting the hub on a shift shaft, the plunger having a portion protruding through the bore to selectively contact either the shift shaft or a shifting key or pin during rotation of the shift shaft, and a spring to provide resistance to movement of the plunger within the bore thereby causing rotational resistance to the shift shaft while eliminating axial resistance or drag during translation of the shift shaft. In one embodiment, the plunger contacts a shifting element fixed to the shift shaft, such as a shifting key or pin. In another embodiment, the plunger contacts the shift shaft directly but only during selection of the biased shift yoke for translation to engage a particular gear. The plunger preferably includes flats or conical portions which exert a force which tends to return the shift shaft to a neutral position within a first range of rotation, but maintains the position of the shift shaft within a second range of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.