Sheave positioning device
US9394992B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2008 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Mar 31, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/6605
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sheave positioning device is provided. A valve element is arranged on a flow path to close the flow path when pushed in a direction against a pressure from hydraulic chambers, and a valve closing mechanism is also arranged on the flow path to generate a thrust force for pushing the valve element in the direction against a pressure from the hydraulic chambers. The valve closing mechanism is adapted to generate the thrust force, which is larger than a load to be applied to the valve element to push the valve element in a direction to open the valve element in case a predetermined speed change ratio is being set, but smaller than a load to be applied to the valve element to push the valve element in a direction to open the valve element in case the pressure in the hydraulic chambers is raised to the maximum pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.