Hydraulic servo assembly for an internal electronic transmission range selection (ETRS) system
US7082851B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Nov 4, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20104
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic servo assembly includes a piston slidably disposed within a housing and a pin extending from the piston. The pin is interconnected with a servo link rod of the ETRS system. A port enables inlet of hydraulic fluid to induce movement of the piston and the pin from a first position to a second position to pull the servo link rod thereby shifting the transmission range to the out-of-park position. When in the first position the pin biases a forward-reverse enable (FRE) valve of the ETRS system in a first position. When in the second position a bias force of the pin is relieved from the FRE valve enabling the FRE valve to shift to a second position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.