Electrically modulated pressure regulator valve with variable force solenoid
US5513673A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86622
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A variable force solenoid valve assembly is provided for use in an automatic transmission controller for controllably reducing a fluid inlet pressure to a desired outlet control pressure. The invention includes a solenoid sub-assembly secured to a valve body sub-assembly. The valve body includes a spool valve having three radially extending lands which translate within a valve body central bore in response to movement of an armature sub-assembly provided in the solenoid sub-assembly. Movement of the spool valve generates first and second flow restriction for controllably regulating the reducing of inlet pressure. In addition, the lands and the central bore comprise two differing diameters for improved outlet pressure regulation. Other various improvements in spool valve design are described including a design which enabled a reduction in the overall size of the solenoid sub-assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.