Electrically controllable biasing differential
US6478708B2 · kind B2 · utility
38Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2000 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jan 29, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2048/346
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A differential gear assembly has a friction clutch for variably restricting differential action. A simple hydraulic piston mechanism is used to amplify the axial force generated by the electric coil and mechanical ball ramp mechanism. The hydraulic system consists of an annular primary piston in contact with the clutch pack, and a multiple set of secondary pistons are attached to the unrestrained ball ramp race. Hydraulic fluid fills the cavity between the primary and secondary pistons. This system provides force multiplication proportional to the surface areas of the respective piston faces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.