Brake bands for an automatic transmission and method for controlling a gear shift in automatic transmission and feedback loop control system
US7066305B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2001 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | May 6, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2121/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A brake band shifting mechanism for an automatic transmission. The brake band shifting mechanism includes a brake band encircling a brake drum of the transmission. A first end of the brake band is mounted to a secured portion of the transmission by a first linkage and a second end of the brake band is mounted to a two-stage servo by a second linkage. The servo provides selective apply and release pressure to the second linkage to control the compression or expansion of the brake band. In operation, the brake band is quickly compressed to the brake drum during the first stage of the servo, and then fine adjustments are made to control the speed of the brake drum during the second stage of the servo, where inputs from position and speed sensors in the transmission are used to control the adjustment of the brake band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.