Hydraulic servo for a brake in an automatic transmission
US7748504B2 · kind B2 · utility
2Cited by
13References
2Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 16, 2006 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Mar 22, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2125/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic servo for a brake in an automatic transmission has a piston secured against rotation without provision of a protrusion on the piston engaging the transmission casing. The piston of the hydraulic servo has an inner cylindrical surface configured to grasp, along their lengths, return springs compressed between the piston and a return plate to which the return springs are fixed. The return plate is bolted to a bulkhead portion of the transmission case and, thus, the piston member is fixed to the bulkhead portion and thereby prevented from rotating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.