Tensioner for an endless transmitting member
US5913742A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Aug 14, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2007/0891
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A tensioner for an endless transmitting member is provided to reliably prevent the loosening of an endless chain, while preventing the occurrence of an incorrect meshing of the endless chain with sprockets. A plunger holder is biased in an advancing direction by the action of a first spring supported in a housing, and a plunger, carried in the plunger holder, is biased in an advancing direction by the action of a second spring having a spring constant larger than that of the first spring. Only the movement of the plunger holder in the advancing direction is permitted by a ratchet mechanism mounted between the plunger holder and the housing. During operation of the engine, the advancing movement of the plunger holder is inhibited by the hydraulic pressure transmitted to a hydraulic pressure chamber, and the plunger is advanced and retracted in accordance with a variation in tension of the endless chain. When the engine is stopped, the ratchet mechanism is operated in accordance with the elongation of the endless chain due to wearing to advance the plunger holder one pitch at a time along with the plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.