Control valve and hydraulic control device for continuously variable transmission devices
US5924450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Oct 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8663
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve is shown for a continuously variable transmission, with a spool of the control valve being maintained at a fixed transmission ratio position between an up-shift position and a downshift position when a signal pressure supplied to the control valve falls within a certain range. The signal pressure is provided to the control valve through a pressure line that is divided, with one branch of the signal pressure line being connected to a first input port of the control valve and the other branch being connected to a second input port through an orifice. Application of a signal pressure within a certain range results in the drain port being selectively connected with the second input port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.