Pressure reducing valve unit
US10443746B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2017 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Jan 16, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86614
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A main spool (24) has a throttle passage (30) that, when the main spool (24) moves to an axial other side against a first return spring (27) in a main spool insertion hole (13), communicates a pilot pressure chamber (25) with a first tank port (15) and limits a flow amount of hydraulic oil to be discharged to the first tank port (15) from the pilot pressure chamber (25). When the main spool (24) moves to the axial other side along the main spool insertion hole (13), the throttle passage (30) communicates the pilot pressure chamber (25) with the first tank port (15) before a state where a first pump port (17) is communicated with an output port (16) and a state where the output port (16) is blocked from the first tank port (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.