Piston for automatic transmission
US7255038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2005 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Oct 31, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2048/0212
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A piston for an automatic transmission includes: (a) a cylindrical wall portion provided by a first piston member; (b) a bottom wall portion provided by a second piston member; and (c) an engaging portion at which the first and second piston members are engaged with each other such that the first piston member is movable relative to the second piston member in an axial direction of the piston by a small distance. The piston is characterized by further including (d) an elastic structure which is provided at the engaging portion, and which biases the first piston member in the axial direction, so as to restrain movement of the first piston member relative to the second piston member in the axial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.