Backlashless ratchet-type tensioner
US6062999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1998 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Nov 9, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2007/0897
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A backlashless ratchet-type tensioner includes a tensioner housing, a plunger slidably fitted into a plunger accommodation bore formed in the tensioner housing and urged by a spring such that a tip portion of the plunger is projected to the exterior of the plunger accommodation bore, and a ratchet pivotally supported on a ratchet pin provided on the tensioner housing. At least one ratchet pawl formed on the ratchet is meshed with rack teeth formed on an outer surface of the plunger so as to prevent the plunger from receding into the plunger accommodation bore. A front face of the ratchet pawl is formed substantially perpendicular to a straight line which passes through a tip of the ratchet pawl and the center of the ratchet pin. The angle between a plane perpendicular to the axis of the plunger and the front face of the ratchet pawl meshed with a rack tooth is slightly smaller than the angle between the plane perpendicular to the axis of the plunger and a rear face of the rack tooth. When the ratchet pawl comes into engagement with a rack tooth, the tip end of the ratchet pawl pushes the rear face of the rack tooth to slightly advance the plunger and hold it in a backlash-eliminate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.